WO2017030011A1 - Fuel filter and element - Google Patents

Abstract

This element is folded in a pleated manner so as to form a plurality of peaks extending in the axial direction on the inner surface thereof. The element is provided with a cylindrical filter material (31, 33) arranged in an annular shape and a frame (41, 43) that is arranged on the radially inward side of the filter material and that supports the filter material from the radially inward side thereof. The frame is provided with a plurality of annular intermediate beams (41h, 43e, 43f) that extend so as to intersect the peaks. The intermediate beams form annular protrusions (41i, 43g) that support the filter material from the radially inward side thereof. The frame is also provided with a plurality of columns (41j, 43i) that extend along the axial direction and that connect the plurality of intermediate beams. The plurality of columns are arranged further inward in the radial direction than the annular protrusions. A fuel filter according to the present invention is provided with a case (11, 12) that accommodates the element and that allows fuel supplied to an internal combustion engine to pass through the element.

Description

Fuel filters and elements Cross-reference of related applications

This application is based on Japanese Patent Application No. 2015-160526 filed on August 17, 2015, the disclosure of which is incorporated herein by reference.

The disclosure herein relates to fuel filters and elements.

Patent Document 1 discloses a filter device in which a plurality of cylindrical elements are arranged coaxially. Elements arranged radially inward do not have an internal frame. The two elements form an independent cylindrical body and are arranged coaxially when assembled. *

Patent Document 2 discloses a filter device in which a plurality of cylindrical elements are arranged coaxially. The filter device discloses an internal frame for supporting the element. The inner frame is a cylindrical thin plate.

US Patent No. 8034240 International publication 2013/0883705 pamphlet

In the configurations of Patent Document 1 and Patent Document 2, a wide range of the inner peak portion of the filter bent in a pleat shape is covered with the reinforcing member. This reduces the filtration area of the filter medium. *

In another aspect, the thickness of the reinforcing member or the structure for fixing the reinforcing member may reduce the passage area. Therefore, it is required to suppress a reduction in passage area caused by the reinforcing member. *

In yet another aspect, multiple components arranged on the same axis may require difficult assembly operations. Therefore, there is a demand for a structure that can be easily assembled. *

In yet another aspect, the plurality of filter media arranged in a stack may compress each other and reduce the function of the filter media. *

In view of the above, or other aspects not mentioned, there is a need for further improvements in fuel filters and elements. *

One object of the present disclosure is to provide a fuel filter and an element that can withstand a high pressure difference while suppressing a reduction in the filtration area of a pleated filter medium. *

Another object of the present disclosure is to provide a fuel filter and an element in which a reduction in passage area caused by a frame that supports the filter medium from the radially inner side is suppressed. *

Still another object of the present disclosure is to provide a fuel filter and an element capable of handling a plurality of parts as one part. *

Still another object of the present disclosure is to provide a fuel filter and an element in which compression of the filter medium is suppressed. *

According to a first aspect of the present disclosure, an element is provided. The element is folded in a pleat shape so as to form a plurality of ridges extending in the axial direction on the inner surface, arranged in an annular shape, and a cylindrical filter medium that filters fuel flowing from the outside to the inside along the radial direction, A frame that is disposed radially inside the filter medium and that defines a plurality of openings through which the fuel passes and supports the filter medium from the radially inner side. The frame is provided in an intermediate portion in the axial direction, and is a plurality of annular intermediate beams extending across the ridges, the intermediate beams providing annular protrusions that support the filter medium from the inside in the radial direction, and the shaft A plurality of pillars extending along the direction and arranged radially inward from the annular protrusion, and connecting a plurality of intermediate beams. *

The annular filter medium is supported from the inside in the radial direction by an annular protrusion that extends across the peak. Since the annular protrusions are in contact with only a part of the peak or are arranged to face each other, the area where the intermediate beam covers the filter medium can be kept small. As a result, the frame supports the filter medium so as to withstand a high pressure difference while suppressing a decrease in the filtration area of the pleated filter medium. *

According to a second aspect of the present disclosure, an element is provided. The element is a cylindrical filter medium that filters the fuel flowing from the outside to the inside along the radial direction. The element is arranged inside the filter medium in the radial direction and defines a plurality of openings through which the fuel passes, and the filter medium is radially inward. And an end plate that is disposed at the end of the frame, and that defines the opening of the fuel outlet passage, and an adhesive layer that joins the filter medium and the frame to the end plate. The frame includes a plurality of rod-like legs that are joined to the end plate by being inserted into the adhesive layer. *

The frame and the end plate are joined by inserting a plurality of rod-shaped legs into the adhesive layer. The rod-like leg is inserted into the adhesive layer without excessively pushing the adhesive layer. The adhesive layer is prevented from flowing out to the opening of the outlet passage. Thereby, the reduction | decrease of the passage area of the exit channel | path resulting from an adhesive layer is suppressed. *

According to a third aspect of the present disclosure, an element is provided. The element includes a cylindrical filter medium for filtering fuel, and a frame that is disposed on the inner side in the radial direction of the filter medium, defines a plurality of openings through which the fuel passes, and supports the filter medium from the inner side in the radial direction. The frame includes a connecting portion that prevents the frame from coming off from the filter medium by contacting the inner surface of the filter medium. *

When the frame is positioned in the filter medium, the connecting portion preliminarily connects the filter medium and the frame. The connecting portion prevents the frame from falling off the filter medium by contacting the inner surface of the filter medium. Thereby, the filter medium and the frame can be handled as one component in the element manufacturing process. *

According to a fourth aspect of the present disclosure, an element is provided. The element is bent in a pleat shape so as to form a plurality of ridges extending in the axial direction on the inner surface, and is arranged in an annular shape, and is a cylindrical first filter medium that filters fuel flowing from the outside to the inside along the radial direction And a cylindrical second filter medium having a predetermined thickness along the radial direction, and a plurality of openings that are disposed on the radial inner side of the second filter medium and allow fuel to pass therethrough. And a frame that supports the first filter medium and the second filter medium from the inside in the radial direction. The frame is provided at the axial end, and is an annular end beam extending across the peak, and has a predetermined end outer diameter, and supports the first filter medium from the radially inner side. An end beam, provided between the two end beams, having a smaller outer diameter than the end outer diameter, and supporting the second filter medium from the radial inner side; and the two end beams An annular intermediate beam extending across the peak and having an intermediate outer diameter that is smaller than the outer diameter of the end and larger than the smaller outer diameter, and both the first filter medium and the second filter medium are And an intermediate beam supported from the inside in the radial direction. *

The first filter medium is supported by the end beams. The second filter medium is supported by the small diameter portion. The difference between the end outer diameter of the end beam and the small outer diameter of the small diameter portion contributes to suppressing the compression of the second filter medium. Further, the frame has an intermediate beam. A second filter medium is interposed between the first filter medium and the frame. The intermediate beam supports the second filter medium. Moreover, the intermediate beam supports the first filter medium via the second filter medium. When the fuel pressure difference acts on the filter medium, the second filter medium is compressed between the first filter medium and the frame. Since the intermediate beam intersects the peak, the second filter medium is strongly compressed at this intersection. In other words, the compression of the second filter medium is suppressed at a portion other than the intersecting portion. Thereby, the thickness required for the second filter medium is maintained over a large area. *

According to another aspect of the present disclosure, a fuel filter is provided. The fuel filter includes an element and a case that houses the element and allows fuel supplied to the internal combustion engine to pass through the element.

It is a block diagram of a fuel supply device concerning a 1st embodiment of this indication. It is sectional drawing of the fuel filter which concerns on 1st Embodiment. It is sectional drawing of the fuel filter of 1st Embodiment. It is sectional drawing of the 1st flame | frame of 1st Embodiment. It is a top view of the 1st frame of a 1st embodiment. It is sectional drawing of the 2nd frame of 1st Embodiment. It is a bottom view of the 2nd frame of a 1st embodiment. It is sectional drawing of the 3rd frame of 1st Embodiment. It is a fragmentary sectional view of the 3rd frame of a 1st embodiment. It is a fragmentary sectional view of the 3rd frame of a 1st embodiment. It is a fragmentary sectional view of the lower part of the 2nd frame of 1st Embodiment. It is a fragmentary sectional view of the lower part of the 2nd frame of 1st Embodiment. It is a fragmentary sectional view of the fuel filter of a 1st embodiment. It is a top view of the 1st end plate of a 1st embodiment. It is a fragmentary sectional view of the 1st frame of a 2nd embodiment of this indication. It is a fragmentary sectional view of the 1st frame of a 3rd embodiment of this indication. It is a sectional view of the 2nd frame of a 4th embodiment of this indication. It is a sectional view of the 2nd frame of a 5th embodiment of this indication. It is a sectional view of the 2nd frame of a 6th embodiment of this indication. It is sectional drawing of the 1st flame | frame and 2nd flame | frame of 7th Embodiment of this indication. It is a top view of the 1st frame of a 7th embodiment, and the 2nd frame. It is sectional drawing of the 1st frame of 8th Embodiment of this indication. It is a top view of the 1st frame of 8th Embodiment. It is a top view of the 1st end plate of a 9th embodiment of this indication. It is a top view of the 1st end plate of a 10th embodiment of this indication. It is a fragmentary sectional view of the lower part of the 2nd frame of an 11th embodiment of this indication. It is a partial sectional view of the lower part of the 2nd frame of a 12th embodiment of this indication.

A plurality of embodiments will be described with reference to the drawings. In embodiments, functionally and / or structurally corresponding parts and / or associated parts may be assigned the same reference signs or reference signs that differ by more than a hundred. For the corresponding parts and / or associated parts, the description of other embodiments can be referred to. *

First Embodiment FIG. 1 shows a fuel supply apparatus 1 in which a filter (FLTR) 10 is used. The filter 10 is used as a fuel filter for filtering fuel. The fuel supply device 1 supplies liquid fuel in a fuel tank (FTNK) 2 to an internal combustion engine (ENGN) 3 that is a fuel consuming device. In a typical example, the internal combustion engine 3 is a diesel engine. In this case, the liquid fuel is diesel fuel. The internal combustion engine 3 may be a gasoline engine. The internal combustion engine 3 is mounted on a vehicle and used as a power source for the vehicle. *

The fuel supply device 1 has a supply pump (SPPM) 4 for supplying liquid fuel in the fuel tank 2 to an injection device (INJD) 5. In the illustrated example, the supply pump 4 is disposed in the fuel tank 2. The injection device 5 includes a high-pressure pump that pressurizes the relatively low-pressure fuel supplied by the supply pump 4 to a high pressure suitable for injection. Further, the injection device 5 includes an injection valve that injects high-pressure fuel into the combustion chamber of the internal combustion engine 3. *

The filter 10 is disposed in a fuel passage between the fuel tank 2 and the injection device 5. In the illustrated example, the filter 10 is provided between the supply pump 4 and the injection device 5. The filter 10 filters the positive pressure fuel pressurized by the supply pump 4. The filter 10 may be disposed on the upstream side of the supply pump 4. In this case, the filter 10 filters the negative pressure fuel sucked by the supply pump 4. The filter 10 filters the fuel and captures foreign matters. The filter 10 also functions as a moisture remover that separates and stores moisture from the fuel. *

FIG. 2 is a longitudinal sectional view of the filter 10 in use. FIG. 3 shows a cross section taken along line III-III in FIG. The filter 10 is described with reference to FIGS. 2 and 3. In the figure, the direction of fuel flow is indicated by thick arrows. The filter 10 has an outer shape that can be called a columnar shape or a cylindrical shape. The filter 10 has a vertically long cylindrical shape as illustrated. The filter 10 has a central axis AX that extends along the direction of gravity. *

The filter 10 has an upper case 11 as a first case and a lower case 12 as a second case. The upper case 11 and the lower case 12 provide a case in which a storage chamber for storing the element 13 is defined. The upper case 11 and the lower case 12 are separable so that the element 13 can be replaced. The upper case 11 and the lower case 12 define a passage through which the fuel supplied to the internal combustion engine passes through the element 13. The upper case 11 provides a fixed part. The upper case 11 is fixed to the vehicle. The upper case 11 is formed in a cap shape. The lower case 12 provides a separable part. The lower case 12 is formed to be separable from the upper case 11 in order to replace the element 13. The lower case 12 is formed in a cup shape. *

The upper case 11 and the lower case 12 are connected by a connecting mechanism 14. In the illustrated example, the coupling mechanism 14 is provided by a screw mechanism. The connection mechanism 14 may be provided by a tightening mechanism including a bolt and a nut, or a bayonet lock mechanism. A seal mechanism 15 is provided between the upper case 11 and the lower case 12. The seal mechanism 15 seals between the upper case 11 and the lower case 12. The seal mechanism 15 is provided by a rubber O-ring. *

The element 13 is disposed between the upper case 11 and the lower case 12. The element 13 is arrange | positioned so that a storage chamber may be divided into a dirty side and a clean side. The element 13 filters the dirty side fuel and supplies it to the clean side. The element 13 has sealing mechanisms 16 and 17. The seal mechanism 16 is provided between the element 13 and the upper case 11. The seal mechanism 16 is provided by a rubber O-ring. The seal mechanism 17 is provided between the element 13 and the lower case 12. The seal mechanism 17 is provided by a rubber lip seal. *

The upper case 11 has a cap 21. The cap 21 is made of resin or metal. The cap 21 is, for example, an aluminum die cast product. The cap 21 has a cylindrical side wall and a dome-shaped upper wall. A coupling mechanism 14 and a seal mechanism 15 are provided on the side wall. The upper wall closes the upper end of the side wall. *

The cap 21 has an inlet 22 for introducing fuel. The inlet 22 communicates with an inlet joint (not shown). The cap 21 defines an inlet gallery 23 that provides a part of the dirty side. The inlet gallery 23 is used as a storage chamber for storing an electric heater that heats the fuel and a temperature-sensitive switch that energizes the electric heater when the fuel temperature is in a predetermined low temperature state by sensing the fuel temperature. May be. A cylindrical connecting tube 24 is provided in the center of the cap 21. The connecting pipe 24 is suspended from the upper wall of the cap 21. The connection pipe 24 provides a connection for connecting to the element 13. The cap 21 has an outlet pipe 25. The outlet pipe 25 communicates with the connection pipe 24. The outlet pipe 25 is connected to the piping of the fuel supply device 1. *

The lower case 12 has a cup 26. The cup 26 is made of resin or metal. The cup 26 has an opening end portion made of, for example, aluminum die casting and a cup portion made of a metal plate. The open end portion provides a coupling mechanism 14. The cup 26 provides a storage chamber 27 for storing the element 13 and a storage chamber 28 for storing foreign matters such as water. The storage chamber 28 is provided below the storage chamber 27, that is, below the element 13. The storage chamber 27 may be used as a chamber for storing a water level sensor for detecting the water level of the stored water. The cup 26 may be used as a member for installing a drain valve for discharging water. *

The element 13 has an outer shape that can be called a columnar shape or a cylindrical shape. The element 13 includes a filter medium 30 and a frame 40. The filter medium 30 is a cylindrical member that filters fuel flowing from the outside to the inside along the radial direction. The frame 40 is a member for maintaining the filter medium 30 in a predetermined shape. The frame 40 is made of resin. The resin frame 40 contributes to the disposal or recycling of the element 13. The filter medium 30 is a filter medium that filters fuel. *

The filter medium 30 has a plurality of filter media arranged in multiple layers along the fuel flow direction. The filter medium 30 includes a filter medium whose main purpose is to remove foreign substances from the fuel and a filter medium whose main purpose is to promote aggregation and separation of moisture. The filter medium for moisture can include a filter medium for aggregation whose main purpose is aggregation of moisture and a water-repellent filter medium that prevents outflow of moisture. Each of the plurality of filter media is formed in a cylindrical shape. The plurality of filter media are arranged on the same axis. The plurality of filter media are arranged such that at least a part of them overlaps each other in the radial direction. In this embodiment, the filter medium 30 includes three filter media 31, 32, 33 arranged in three layers. *

The first filter medium 31 is a filter medium whose main purpose is to remove solid foreign matters from the fuel. The first filter medium 31 is also called a solid removal layer. The first filter medium 31 is disposed on the outermost side. The first filter medium 31 is a filter medium through which fuel first passes. The first filter medium 31 is formed by arranging filter paper bent into a pleat shape in a cylindrical shape. *

The second filter medium 32 is a filter medium whose main purpose is to promote moisture aggregation. The second filter medium 32 captures moisture and grows the moisture into water droplets. The second filter medium 32 is formed of hydrophilic fibers. The second filter medium 32 is also called an agglomerated layer. The second filter medium 32 is disposed on the radially inner side of the first filter medium 31. The second filter medium 32 is a filter medium through which fuel passes second. The second filter medium 32 is formed by arranging a nonwoven fabric having a predetermined thickness in a cylindrical shape. *

The third filter medium 33 is a filter medium whose main purpose is to separate water from fuel. The third filter medium 33 is also an outflow prevention member that prevents moisture from passing through the element 13. The third filter medium 33 is formed of water-repellent fibers. The third filter medium 33 is also called a water repellent layer. The third filter medium 33 is disposed on the radially inner side of the second filter medium 32. The third filter medium 33 is a filter medium through which fuel passes third. The third filter medium 33 is formed by arranging filter paper bent into a pleat shape in a cylindrical shape. *

The first filter medium 31 and the second filter medium 32 form a cylindrical outer layer filter medium in the element 13. An outer chamber 35 as a dirty side into which fuel is introduced is formed on the outer side in the radial direction of the outer layer filter medium. The outer chamber 35 is defined between the cup 26 and the first filter medium 31. The third filter medium 33 forms a cylindrical inner layer filter medium disposed on the radially inner side of the outer layer filter medium. *

A separation chamber 36 for allowing water to settle is defined between the outer layer filter medium and the inner layer filter medium. The separation chamber 36 has a relatively large thickness along the radial direction, that is, the fuel flow direction, in order to enable separation of fuel and moisture by gravity. The separation chamber 36 is defined by a frame 40. The separation chamber 36 is also called an intermediate chamber between the dirty side and the clean side. The separation chamber 36 is located above the storage chamber 28. The separation chamber 36 extends in a cylindrical shape above the storage chamber 28. *

An inner chamber 37 as a clean side is defined on the radially inner side of the third filter medium 33. The inner chamber 37 communicates with the connection pipe 24 and the outlet pipe 25.

The frame 40 has a plurality of cylindrical frames 41, 42, 43 and a plurality of flat frames 45, 46, 47. The cylindrical frames 41, 42 and 43 contribute to maintaining the shape of the filter medium 30 in the radial direction. The cylindrical frames 41, 42, 43 are net-like members. The flat frame 45, 46, 47 provides an end plate that partitions the flow path at the end of the element 13. The plurality of frames 41, 42, 43, 45, 46, 47 are joined by adhesive layers 51, 52, 53. *

The first frame 41 is cylindrical. The first frame 41 has a shape that can be called a polygonal cylindrical shape or a cylindrical shape. The first frame 41 is disposed on the outermost radial direction of the frame 40. The first frame 41 is disposed on the radially inner side of the outer layer filter medium. The first frame 41 supports the outer layer filter medium from the radially inner side by contacting the inner surface of the outer layer filter medium, that is, the inner surface of the first filter medium 31 and the inner surface of the second filter medium 32. The first frame 41 supports the first filter medium 31 and the second filter medium 32 by the radially outer surface thereof. *

The second frame 42 is cylindrical. The second frame 42 is disposed on the radially inner side of the first frame 41. The first frame 41 and the second frame 42 provide an outer frame. The second frame 42 functions as a reinforcing member that reinforces the first frame 41. The second frame 42 functions as a member for defining the separation chamber 36. The first frame 41 and the second frame 42 are provided between the outer layer filter media 31, 32 and the inner layer filter media 33. *

The third frame 43 is cylindrical. The third frame 43 is disposed on the radially inner side of the second frame 42. The third frame 43 provides an inner frame. The third frame 43 supports the third filter medium 33 by its radially outer surface. The third frame 43 supports the third filter medium 33 from the radially inner side by contacting the inner surface of the third filter medium 33. *

The first end plate 45 has a disk shape. The first end plate 45 is provided at the upper end of the element 13. The first end plate 45 defines the outer diameter of the upper end of the element 13. The first end plate 45 has a connection portion 49. The connection part 49 is inserted into the connection pipe 24. The first end plate 45 defines an opening 49 a for an outlet passage that the connection portion 49 defines. The opening 49a opens in a circular shape on the lower end surface of the first end plate 45, that is, the end surface on the filter medium 30 side. The first end plate 45 has an adhesive layer 51. The adhesive layer 51 is provided between the opening 49 a and the outer edge of the first end plate 45.

The adhesive layer 51 joins the upper end of the first filter medium 31 and the first end plate 45. As a result, the upper end of the first filter medium 31 is blocked by the first end plate 45 and the adhesive layer 51. The adhesive layer 51 joins the upper end of the first frame 41 and the first end plate 45. The adhesive layer 51 joins the upper end of the second frame 42 and the first end plate 45. The adhesive layer 51 joins the upper end of the third filter medium 33 and the first end plate 45. As a result, the upper end of the third filter medium 33 is blocked by the first end plate 45 and the adhesive layer 51. The adhesive layer 51 joins the upper end of the third frame 43 and the first end plate 45. *

The first end plate 45 provides a wide annular surface extending over all of the first filter medium 31, the first frame 41, the second frame 42, the third filter medium 33, and the third frame 43. The first end plate 45 is joined to the first filter medium 31, the first frame 41, the second frame 42, the third filter medium 33, and the third frame 43 by the adhesive layer 51. All the filter media are supported on the lower side of the first end plate 45. The first end plate 45 is also called an end plate common to the outer layer filter medium and the inner layer filter medium. The first end plate 45 enables the multilayer filter medium 30 to be arranged with a simple configuration. *

The second end plate 46 is annular. The second end plate 46 is provided at the lower end of the element 13. The second end plate 46 has a cylindrical leg. The leg portion supports the seal mechanism 17. The second end plate 46 defines the outer diameter of the lower end of the element 13. The seal mechanism 17 seals between the second end plate 46 and the cup 26. The second end plate 46 has an adhesive layer 52. *

The adhesive layer 52 joins the lower end of the first filter medium 31 and the second end plate 46. As a result, the lower end of the first filter medium 31 is blocked by the second end plate 46 and the adhesive layer 52. The adhesive layer 52 joins the lower end of the first frame 41 and the second end plate 46. *

The third end plate 47 has a disk shape. The third end plate 47 is provided at the lower end of the element 13. The third end plate 47 is disposed on the radially inner side of the second end plate 46. The third end plate 47 has an adhesive layer 53. *

The adhesive layer 53 joins the lower end of the second frame 42 and the third end plate 47. The adhesive layer 53 joins the lower end of the third filter medium 33 and the third end plate 47. As a result, the lower end of the third filter medium 33 is blocked by the third end plate 47 and the adhesive layer 53. The adhesive layer 53 joins the lower end of the third frame 43 and the third end plate 47. *

The first frame 41 connects the first end plate 45 and the second end plate 46 to provide an inner frame for the outer layer filter medium. The third frame 43 connects the first end plate 45 and the third end plate 47 and provides an inner frame for the inner layer filter medium. The second frame 42 connects the first end plate 45 and the third end plate 47. The second frame 42 is located outside the inner layer filter medium in the radial direction, thereby providing an outer frame for the inner filter medium, that is, the third filter medium 33. At the same time, the second frame 42 provides a forming member that partitions the separation chamber 36 between the first frame 41 and the third filter medium 33. *

The sealing mechanisms 16 and 17 seal between the upper case 11 and the lower case 12 and the first end plate 45 and the second end plate 46. In addition, the seal mechanisms 16 and 17 allow the first end plate 45 and the second end plate 46 to move in the axial direction with respect to the upper case 11 and the lower case 12. That is, the element 13 is supported in the upper case 11 and the lower case 12 so as to be slightly movable in the axial direction. In order to provide a seal while allowing movement, the upper case 11 and the lower case 12 are formed such that the O-ring and lip seals that provide the sealing mechanisms 16, 17 are in contact with the cylindrical surface. *

The second frame 42 has a plurality of ribs 48. The rib 48 is plate-shaped. The rib 48 has a thin plate shape having a thickness comparable to the circumferential width of the column 42f. The rib 48 extends along the radial direction and the axial direction. The rib 48 is provided on the radially outer side of the column 42f. The rib 48 is also a part of the column 42f. The plurality of ribs 48 are integrally formed with the plurality of columns 42f by resin. The rib 48 is provided on a part of the plurality of pillars 42f. Therefore, the second frame 42 also has a column 42 f that does not have the rib 48. The rib 48 extends from the second frame 42 outward in the radial direction. The rib 48 allows a radial flow and an axial flow in the separation chamber 36. The rib 48 is formed so as not to obstruct the flow that penetrates the separation chamber 36 in the radial direction and the axial flow over the entire height of the separation chamber 36. *

The rib 48 is disposed between the first frame 41 and the second frame 42. The rib 48 is also called a radial rib extending in the radial direction between the two frames 41 and 42 in the outer frame. The radially outer end of the rib 48 is in contact with the inner surface of the first frame 41 or is opposed to the inner surface of the first frame 41. The rib 48 is located on the radially inner side of the thick pillar 41 m of the first frame 41. The ribs 48 are provided at both ends of the second frame 42 in the axial direction. The plurality of ribs 48 support the first frame 41 from the inside in the radial direction by providing contact between the first frame 41 and the second frame 42. *

The rib 48 serves to define the separation chamber 36. The rib 48 supports the first frame 41 from the radially inner side. For example, when the first frame 41 attempts to deform radially inward, the rib 48 contacts the inner surface of the first frame 41 and suppresses deformation of the first frame 41 inward in the radial direction. *

The adhesive layers 51, 52, 53 are formed by curing the end plates 45, 46, 47 after being joined to other members in a melted state by heating. The adhesive layers 51, 52, 53 may be provided by a thermoplastic resin such as hot melt. *

A cylindrical cavity defined by a plurality of ribs 48 between the first frame 41 and the second frame 42 is located above the storage chamber 28 and communicates directly with the storage chamber 28 in the vertical direction. This configuration facilitates settling of the separated water into the storage chamber 28. *

FIG. 4 shows a longitudinal section of the first frame 41. FIG. 5 is a view taken in the direction of arrow V in FIG. The first frame 41 is made of resin. The first frame 41 is an integrally molded product. The first frame 41 is a cylindrical member that is open at both ends. The first frame 41 defines a plurality of openings 41a through which fuel passes through the cylindrical wall. The first frame 41 has a net shape or a cage shape. *

The first frame 41 has a plurality of beams 41b, 41c, 41d extending along a plane orthogonal to the central axis AX. The plurality of beams 41b, 41c, 41d are formed in an annular shape. The first frame 41 has an end beam 41b provided at the upper end and an end beam 41c provided at the lower end. The end beams 41b and 41c have a shape that can be called a short cylindrical shape. The first frame 41 is formed vertically symmetrical. The first frame 41 can be used upside down. The end beams 41b and 41c have a large diameter portion and a small diameter portion. *

The large-diameter portion has a cylindrical outer surface on the radially outer side. The cylindrical outer surface has an outer diameter D41L. The outer diameter D41L is also called an end outer diameter. The end beams 41b and 41c are in contact with the radially inner surface of the first filter medium 31 at the large diameter portion. The end beams 41b and 41c provide end support portions that support the first filter medium 31 from the radially inner side at both axial ends. *

The small diameter portion has a cylindrical outer surface on the radially outer side. The cylindrical outer surface has an outer diameter D41S. The outer diameter D41S is smaller than the outer diameter D41L. The end beams 41b and 41c are in contact with the radially inner surface of the second filter medium 32 at the small diameter portion. The end beams 41b and 41c provide end support portions that support the second filter medium 32 in the radial direction at both axial ends thereof. *

The first frame 41 has a plurality of intermediate beams 41d provided between the upper end and the lower end. The plurality of intermediate beams 41d are provided apart from each other in the axial direction. The intermediate beam 41d is an annular member. *

An annular receiving groove 41e is formed in the end beams 41b and 41c. The receiving groove 41e is formed as a recess at the inner corner of the ends of the end beams 41b and 41c. The receiving groove 41 e is used for connection with the second frame 42. A plurality of grooves 41f are formed in the end beams 41b and 41c. The plurality of grooves 41f are formed as grooves deeper in the axial direction than the receiving groove 41e. The plurality of grooves 41f are arranged away from each other in the circumferential direction. The plurality of grooves 41 f are used for positioning the first frame 41 and the second frame 42. *

The plurality of intermediate beams 41d have the same inner diameter. The plurality of intermediate beams 41d include a small-diameter beam 41g and a large-diameter beam 41h having different outer diameters. The large-diameter beam 41h has a larger diameter than the small-diameter beam 41g. In the illustrated example, two small-diameter beams 41g and three large-diameter beams 41h are provided. The large-diameter beam 41h is provided in the central portion of the first frame 41 in the axial direction. *

The large-diameter beam 41 h provides an annular protrusion 41 i on the radially outer surface of the first frame 41. The annular protrusion 41i extends so as to surround the first frame 41 along the circumferential direction. The annular protrusion 41 i is provided at the center of the first frame 41 in the axial direction. The annular protrusion 41i has an outer diameter D41M. The outer diameter D41M is slightly smaller than the outer diameter D41L and slightly larger than the outer diameter D41S (D41S <D41M <D41L). The annular protrusion 41 i supports the first filter medium 31 from the radially inner side via the second filter medium 32. The annular protrusion 41i provides an intermediate support part that supports the first filter medium 31 in the axial direction in the radial direction. *

The annular protrusion 41i extends so as to be orthogonal to the inner peak of the first filter medium 31 bent into a pleat shape. Even if the first filter medium 31 is strongly pressed against the annular protrusion 41i, the portion of the first filter medium 31 that is covered and closed by the annular protrusion 41i is the intersection of the inner peak and the annular protrusion 41i. is there. Therefore, the first filter medium 31 can be supported from the radially inner side while suppressing a decrease in the filtration area of the first filter medium 31. *

The first frame 41 has a plurality of pillars 41j extending along the axial direction. The plurality of columns 41j connect the plurality of beams 41b, 41c, and 41d. The plurality of pillars 41j include a thin pillar 41k and a thick pillar 41m that is thicker than the thin pillar 41k. The thick pillar 41m has a relatively thick cross-sectional shape for increasing the mechanical strength of the first frame 41. The thick pillar 41m is positioned corresponding to the plurality of grooves 41f. A virtual circle defined by the radially outer surfaces of the plurality of columns 41j has an outer diameter D41S. *

In this embodiment, the second filter medium 32 is supported by the outer surfaces of the small-diameter portions of the end beams 41b and 41c, the outer surfaces of the plurality of intermediate beams 41d, and the outer surfaces of the plurality of columns 41j. These portions are provided between the two end beams 41b and 41c and have a small outer diameter D41S smaller than the end outer diameter D41L. These portions provide a small-diameter portion that supports the second filter medium 32 from the radially inner side. The 2nd filter medium 32 may be adhere | attached on the surface which supports it. The plurality of outer diameter relationships D41S <D41M <D41L in the first frame 41 contribute to suppressing the compression of the second filter medium 32 and maintaining the thickness of the second filter medium 32. *

Referring back to FIG. 3, the plurality of pillars 41j have a surface inclined with respect to the fuel flowing from the outside toward the inside along the radial direction. This surface is a flat surface or a curved surface. The cross section of the thick pillar 41m has a shape that can be called a triangle or a trapezoid. The thick pillar 41m is formed with an inclined surface for suppressing fluid resistance against the flow of fuel. The thin column 41k is a prism with rounded corners. The thin column 41k is also given a cross-sectional shape that suppresses fluid resistance. The rib 48 is not positioned on the radially inner side of the thin column 41k. A rib 48 is positioned on the radially inner side of the thick pillar 41m.

Returning to FIG. 2, the first filter medium 31 is supported by the end beams 41b and 41c. The second filter medium 32 is supported by the small diameter portion. The difference between the end outer diameter D41L and the small outer diameter D41S contributes to suppress the compression of the second filter medium 32. The second filter medium 32 is in contact with the radially outer surface of the small diameter part, and a gap is formed between the first filter medium 31 and the second filter medium 32 on the radial outer side of the small diameter part. This gap may be filled with the second filter medium 32. *

Further, the first frame 41 has an intermediate beam 41h. A second filter medium 32 is interposed between the first filter medium 31 and the first frame 41. The intermediate beam 41h supports the second filter medium 32. In addition, the intermediate beam 41 h supports the first filter medium 31 via the second filter medium 32. When a fuel pressure difference acts on the filter media 31 and 32, the second filter media 32 is compressed between the first filter media 31 and the first frame 41. Since the intermediate beam 41h intersects the peak, the second filter medium 32 is strongly compressed at the intersecting portion. In other words, the compression of the second filter medium 32 is suppressed at a portion other than the intersecting portion. Thereby, the thickness required for the second filter medium 32 is maintained over a large area. *

FIG. 6 shows a longitudinal section of the second frame 42. 7 is a view taken along arrow VII in FIG. The second frame 42 is made of resin. The second frame 42 is an integrally molded product. The second frame 42 is a cylindrical member that is open at both ends. The second frame 42 defines a plurality of openings 42a for allowing fuel to pass through the cylindrical wall. The second frame 42 has a net shape or a cage shape. *

The second frame 42 has a plurality of beams 42b, 42c, and 42d extending along a plane orthogonal to the central axis AX. The plurality of beams 42b, 42c, and 42d are formed in an annular shape. The second frame 42 includes an end beam 42b provided at the upper end and an end beam 42c provided at the lower end. The end beams 42b and 42c have a shape that can be called a short cylindrical shape. The second frame 42 has a plurality of intermediate beams 42d provided between the upper end and the lower end. The plurality of intermediate beams 42d are provided away from each other in the axial direction. The intermediate beam 42d is an annular member. The plurality of intermediate beams 42d have the same inner diameter. The plurality of intermediate beams 42d have the same outer diameter. *

The end beam 42c at the lower end has a receiving groove 42e for receiving the third end plate 47 on the radially inner side. The receiving groove 42 e defines the axial position and the radial position of the third end plate 47. *

The second frame 42 has a plurality of pillars 42f extending along the axial direction. The plurality of pillars 42f connect the plurality of beams 42b, 42c, and 42d. The plurality of columns 42f have the same thickness. *

The second frame 42 has a plurality of protrusions 42g on the radially outer side of the upper end beam 42b. The plurality of protrusions 42 g are fitted into the plurality of grooves 41 f provided in the first frame 41. The plurality of grooves 41f and the plurality of protrusions 42g provide a positioning mechanism for positioning the rib 48 on the radially inner side of the thick pillar 41m. Therefore, the first frame 41 and the second frame 42 include positioning mechanisms 41 f and 42 g for positioning the plurality of ribs 48 on the radially inner side of the plurality of thick pillars 41 m of the first frame 41. *

The second frame 42 has a rib 48. The second frame 42 has an upper rib 48a provided at the upper part and a lower rib 48b provided at the lower part. The upper rib 48a extends over the radially outer side of the end beam 42b and the radially outer side of the column 42f. The upper rib 48a contacts the inner surface of the first frame 41 to position the first frame 41 and the second frame 42 in the radial direction. The lower rib 48b is provided on the radially outer side of the column 42f. The lower rib 48b contacts the inner surface of the first frame 41 to position the first frame 41 and the second frame 42 in the radial direction. The upper rib 48a and the lower rib 48b are disposed away from each other in the axial direction. Thus, the first frame 41 and the second frame 42 are stably positioned in a specified positional relationship with respect to the radial direction. *

FIG. 8 shows a longitudinal section of the third frame 43. The third frame 43 is made of resin. The third frame 43 is an integrally molded product. The third frame 43 is a cylindrical member that is open at both ends. The third frame 43 defines a plurality of openings 43a for allowing fuel to pass through the cylindrical wall. The third frame 43 has a net shape or a cage shape. *

The third frame 43 includes an end beam 43b provided at the upper portion and an end beam 43c provided at the lower portion. The end beams 43b and 43c are annular members. The third frame 43 is formed vertically symmetrical. The third frame 43 can be used upside down. The end beams 43b and 43c have a cylindrical outer surface on the radially outer side. The cylindrical outer surface has an outer diameter D43M. The end beams 43b and 43c are in contact with the radially inner surface of the third filter medium 33 on the cylindrical outer surface. The end beams 43b and 43c provide end support portions that support the third filter medium 33 in the radial direction at both ends in the axial direction. *

The third frame 43 has a plurality of intermediate beams 43d provided between the upper end and the lower end. The plurality of intermediate beams 43d are provided apart from each other in the axial direction. The intermediate beam 43d is an annular member. *

The end beams 43b and 43c and the plurality of intermediate beams 43d have the same inner diameter D43N. The end beams 43b and 43c have an outer diameter D43M. The plurality of intermediate beams 43d include a small-diameter beam 43e and a large-diameter beam 43f having different outer diameters. The small-diameter beam 43e has an outer diameter D43M. The large-diameter beam 43f has a larger diameter than the small-diameter beam 43e. The large-diameter beam 43f has an outer diameter D43L. The outer diameter D43L is slightly larger than the outer diameter D43M. In the illustrated example, two small-diameter beams 43e and one large-diameter beam 43f are provided. The large-diameter beam 43f is provided in the central portion of the third frame 43 in the axial direction. *

FIG. 9 shows a cross section of the radially outer end of the small-diameter beam 43e. The small-diameter beam 43e provides an annular protrusion 43g. The top surface of the annular protrusion 43g defines the outer diameter D43M. The annular protrusion 43g supports the third filter medium 33 from the inside in the radial direction by contacting a plurality of peaks on the inner peripheral surface of the third filter medium 33. *

FIG. 10 shows a cross section of the radially outer end of the large-diameter beam 43f. The large-diameter beam 43f provides an annular protrusion 43g. The annular protrusion 43g supports the third filter medium 33 from the inside in the radial direction by contacting a plurality of peaks on the inner peripheral surface of the third filter medium 33. Furthermore, the large-diameter beam 43f has an annular small protrusion 43h that extends further outward in the radial direction from the annular protrusion 43g. The annular small protrusion 43h is formed on the top surface of the annular protrusion 43g, that is, the outer peripheral surface, by a thin protrusion extending in an annular shape. The top surface of the annular small protrusion 43h defines an outer diameter D43L. The annular small protrusion 43h extends so as to surround the third frame 43 along the circumferential direction. The small annular protrusion 43 h is provided in the central portion of the third frame 43 in the axial direction. The plurality of intermediate beams 43d include a large-diameter beam 43f including an annular small protrusion 43h and a small-diameter beam 43e not including the annular small protrusion 43h. *

The annular small protrusion 43 h is in strong contact with a plurality of peaks on the inner peripheral surface of the third filter medium 33. The annular small protrusion 43 h elastically deforms the peak of the inner surface of the third filter medium 33 when the third frame 43 is inserted into the third filter medium 33. The annular small protrusion 43 h may partially plastically deform the peak of the inner surface of the third filter medium 33. The annular small protrusion 43 h realizes loose connection between the third filter medium 33 and the third frame 43. The annular small protrusion 43 h provides a connecting portion that connects the third filter medium 33 and the third frame 43 at an intermediate portion in the axial direction of the third frame 43. This connecting portion provides a fit that prevents the third frame 43 from falling out of the third filter medium 33. As a result, the third filter medium 33 and the third frame 43 can be handled as one component. *

The end beams 43b and 43c and the plurality of intermediate beams 43d extend so as to be orthogonal to the inner peak of the third filter medium 33 bent into a pleat shape. In this embodiment, the third filter medium 33 is supported by the outer surfaces of the end beams 43b and 43c and the outer surfaces of the plurality of intermediate beams 43d. Therefore, the end beams 43b and 43c and the plurality of intermediate beams 43d can support the third filter medium 33 from the radially inner side while suppressing a decrease in the filtration area of the third filter medium 33. *

The third frame 43 has a plurality of pillars 43i extending along the axial direction. The plurality of pillars 43i connect the plurality of beams 43b, 43c, and 43d. A virtual circle defined by the radially outer surfaces of the plurality of columns 43i has an outer diameter D43S. The outer diameters D43S, D43M, and D43L provide a relationship of D43S <D43M <D43L. *

The third frame 43 has a plurality of leg portions 43j and 43k extending in the axial direction from the end portion. The leg portions 43j and 43k are rod-shaped protrusions that terminate at the end portions. The leg portions 43j and 43k further extend in the axial direction from the end beams 43b and 43c. The leg portions 43j and 43k extend on the extension of the plurality of columns 43i. However, the plurality of leg portions 43j and 43k are disposed slightly outward in the radial direction from the plurality of columns 43i. A virtual circle defined by the radially outer surfaces of the plurality of leg portions 43j and 43k has an outer diameter D43L. A virtual circle defined by the radially inner surfaces of the plurality of leg portions 43j and 43k has an inner diameter D43W. The inner diameter D43W is larger than the inner diameter D43N (D43N <D43W). *

Returning to FIG. 2, the plurality of upper leg portions 43 j are joined to the first end plate 45 by the adhesive layer 51. The plurality of leg portions 43j are inserted deeply into the adhesive layer 51. The plurality of leg portions 43j provide a wide bonding surface and various shapes of bonding surfaces. Thereby, the 3rd frame 43 and the 1st end plate 45 are joined firmly. The plurality of leg portions 43 k at the lower end are joined to the third end plate 47 by the adhesive layer 53. The plurality of leg portions 43k are inserted deeply into the adhesive layer 53. The plurality of leg portions 43k provide a wide bonding surface and various shapes of bonding surfaces. As a result, the third frame 43 and the third end plate 47 are firmly joined. *

The plurality of leg portions 43j and 43k are rod-shaped. Therefore, the plurality of leg portions 43j and 43k are inserted into the adhesive layer without excessively pushing the adhesive layer. Thereby, the outflow of the adhesive layer 51 to the opening 49a is suppressed. *

The inner diameter D43W defined by the plurality of leg portions 43j is larger than the inner diameter of the opening portion 49a of the outlet passage. The leg 43j is positioned on the lower surface of the first end plate 45 by a predetermined width away from the opening 49a in the radial direction. In the manufacturing method, the plurality of leg portions 43j are inserted into the adhesive layer 51 in a molten state. At this time, a part of the adhesive layer 51 may flow inward in the radial direction by the plurality of leg portions 43j. Since the leg 43j is positioned on the radially outer side than the opening 49a, the flowing adhesive layer 51 is suppressed from flowing toward the opening 49a. *

According to this embodiment, the third frame 43 and the first end plate 45 are joined while suppressing the flow of the adhesive layer 51. For this reason, the reduction of the area of the opening part 49a of the exit channel | path resulting from the contact bonding layer 51 is suppressed. Moreover, after the adhesive layer 51 is hardened, it is avoided that fragments of the adhesive layer 51 flow out to the outlet passage. *

FIG. 11 shows a shape before joining the second frame 42 and the third end plate 47. FIG. 12 shows the shape after joining the second frame 42 and the third end plate 47. With reference to FIG. 11 and FIG. 12, the manufacturing method of the element 13 including the process of joining the 2nd frame 42 and the 3rd end plate 47 is demonstrated. *

The second frame 42 has an annular receiving groove 42e at the inner corner of the lower end beam 42c. The receiving groove 42e provides a recess for receiving the third end plate 47 from the end of the second frame 42 to the inside of the end beam 42c. The end beam 42c has a small diameter portion 42j having a relatively small inner diameter at the entrance of the receiving groove 42e. The small diameter portion 42 j has an inner diameter that can receive the third end plate 47. The small diameter portion 42j contributes to the positioning of the third end plate 47 in the radial direction. The end beam 42c has a large-diameter portion 42k having an inner diameter larger than that of the small-diameter portion 42j at the back of the small-diameter portion 42j, in other words, above. The large diameter portion 42k is formed between the bottom portion of the receiving groove 42e and the small diameter portion 42j. The large diameter portion 42k is defined by a slope inclined so as to spread radially outward from the small diameter portion 42j and a cylindrical inner surface.

The end beam 42c has a plurality of grooves 42m behind the receiving groove 42e from the large diameter portion 42k. The plurality of grooves 42m further extend in the axial direction from the bottom of the receiving groove 42e. The plurality of grooves 42m are formed away from each other in the circumferential direction. The plurality of grooves 42m are formed so as to extend further above the receiving groove 42e. *

As shown in FIG. 11, the third filter medium 33 is positioned in the second frame 42. The third end plate 47 carries a molten adhesive layer 53. In the manufacturing method, the third end plate 47 is pushed into the receiving groove 42 e from the lower opening of the second frame 42. An end plate is received in the end beam. The radial position of the end plate is defined by the small diameter portion. A part of the adhesive layer may try to leak outward in the radial direction of the end plate and further from the inside to the outside of the end beam. *

As shown in FIG. 12, the adhesive layer 53 contacts the end face of the third filter medium 33. The adhesive layer 53 closes the end surface of the third filter medium 33. The adhesive layer 53 joins the third filter medium 33 and the third end plate 47. A part of the adhesive layer 53 is pushed into the groove 42m. The adhesive layer 53 enters the plurality of grooves 42m. Thereby, the rotation of the third end plate 47 is prevented. *

A part of the adhesive layer 53 flows out radially outward to become an irregular adhesive layer 53a having an irregular shape. The small diameter portion 42j and the third end plate 47 prevent the indeterminate adhesive layer 53a from flowing out. As a result, the amorphous adhesive layer 53a accumulates in the large diameter portion 42k. Soon, the adhesive layer 53 is cured again. Thereby, a joining process is completed. *

In this embodiment, the small-diameter portion 42j defines an opening end that opens downward. For this reason, the boundary between the second frame 42 and the third end plate 47 is positioned on the radially inner side of the end face. Such an arrangement suppresses the exposure of the amorphous adhesive layer 53a to the outer peripheral surface of the second frame 42. Further, the irregular adhesive layer 53a from which the large-diameter portion 42k is about to flow is accumulated. Therefore, the large-diameter portion 42k also suppresses the exposure of the amorphous adhesive layer 53a to the outer peripheral surface of the second frame 42. A portion 53a of the adhesive layer enters between the outer peripheral surface of the third end plate 47 and the large diameter portion 42k. However, a part 53 a of the adhesive layer is not exposed on the outer surfaces of the end beam 42 c and the third end plate 47. As a result, a smooth surface is formed on the outer peripheral surface of the second frame 42. A smooth surface is also formed on the end face of the second frame 42. *

In the cases 11 and 12, the storage chamber 28 is positioned under the end beam 42 c. The smooth surface promotes the flow of water droplets WD. Further, the smooth surface promotes separation of the water droplet WD from the lower end of the second frame 42. As a result, water droplets WD are suppressed from accumulating at the lower end of the second frame 42. When the water droplet WD flows down on the surface of the second frame 42, the water droplet WD can flow down without being obstructed by the irregular portion formed by the portion 53a of the adhesive layer. The water droplet WD flows smoothly toward the storage chamber 28. *

FIG. 13 shows an example of a preliminary assembly state of the element 13 and the cap 21. When the element 13 is accommodated between the upper case 11 and the lower case 12, the element 13 may come into contact with the open end 21a of the cap 21. For example, when the element 13 is disposed in the cup 26 and the cup 26 is connected to the cap 21, the element 13 temporarily held at a slightly raised position comes into contact with the opening end 21 a of the cap 21 and is pressed. *

The first end plate 45 defines a gap between the first end plate 45 and the opening end 21a by partially contacting the opening end 21a. The first end plate 45 has a disc portion 45a that is a circular flat plate. The disc part 45a has a size that can cover the open end 21a. The disc part 45a is arrange | positioned so that the opening end 21a may be opposed. The 1st end plate 45 has the spacer 45b which contacts the opening end 21a. The spacer 45 b protrudes from the disc portion 45 a toward the cap 21. The spacer 45b is provided by a radially extending protrusion. The spacer 45b defines a passage for allowing the passage of fuel between the opening end 21a. *

As shown in FIG. 14, the spacer 45 b is provided on the upper surface of the first end plate 45. The spacer 45 b is a protrusion that protrudes further upward from the upper surface of the first end plate 45. The spacer 45 b is provided by a plurality of radial ridges extending elongated along the radial direction of the first end plate 45. *

The spacer 45 b contacts the open end 21 a of the cap 21. The spacer 45b is in contact with the open end 21a at a radially outer portion of the element 13. Therefore, the inclination of the element 13 is suppressed. Thereby, the element 13 is accommodated between the upper case 11 and the lower case 12 in a normal posture. The spacer 45b provides a gap for the fuel to pass even if the opening end 21a and the first end plate 45 are in contact with each other. Therefore, the fuel passage is reliably formed. *

According to this embodiment, fuel is supplied from the fuel tank 2 to the filter 10 by the supply pump 4. The fuel is filtered by the filter 10 and supplied to the injection device 5. The fuel is pressurized by the injection device 5 and supplied to the internal combustion engine 3. *

In the filter 10, fuel is supplied from the inlet 22 into the gallery 23. The fuel introduced from the inlet 22 reaches the outer chamber 35 via the radially outer side of the first end plate 45. The fuel flows downward in the outer chamber 35. Thereafter, the fuel sequentially passes through the plurality of filter media 31, 32, and 33 arranged on the same axis. The fuel first passes through the first filter medium 31 in the radial direction. The first filter medium 31 mainly removes solid foreign matters from the fuel. Next, the fuel passes through the second filter medium 32 in the radial direction. The second filter medium 32 captures moisture mixed in the fuel. The second filter medium 32 grows water droplets by aggregating moisture. The fuel passes through the first frame 41 and reaches the separation chamber 36. In the separation chamber 36, water droplets or the like mixed in the fuel are settled by gravity. The settled water droplets are sorted out. For example, moisture settles in the storage chamber 28 and is stored. *

The fuel passes through the second frame 42 and reaches the third filter medium 33. The third filter medium 33 allows the fuel to pass therethrough and inhibits the passage of moisture. As a result, the moisture flows down the surface or the inside of the third filter medium 33 and settles into the storage chamber 28 from the lower end of the second frame 42. In this embodiment, since the leakage of the adhesive layer 53 to the outer peripheral surface of the second frame 42 is suppressed, water droplets flow smoothly from the lower end of the second frame 42. The fuel passes through the third filter medium 33. Further, the fuel passes through the third frame 43 and reaches the inner chamber 37. The fuel flows with the inner chamber 37 facing upward. The fuel flows out from the filter 10 via the connection portion 49, the connection pipe 24, and the outlet pipe 25. *

According to this embodiment, the outer layer provided by the first filter medium 31 and the second filter medium 32 and the inner layer provided by the third filter medium 33 are disposed on the common first end plate 45. This configuration makes it possible to provide the multilayer element 13 with a small number of parts. *

According to this embodiment, the first frame 41 and the second frame 42 provide an outer frame having high rigidity. In particular, the rib 48 supports the first frame 41 from the radially inner side. Thereby, even if a pressure difference acts on the first filter medium 31 and the second filter medium 32 in the radial direction, the first filter medium 31 and the second filter medium 32 are maintained in a prescribed shape. In addition, the second frame 42 defines a separation chamber 36 between the outer layer provided by the first filter medium 31 and the second filter medium 32 and the inner layer provided by the third filter medium 33. Thereby, the separation chamber 36 for allowing the water to settle is partitioned and formed reliably. *

The third frame 43 supports the third filter medium 33 from the radially inner side of the third filter medium 33. Therefore, even if a large pressure difference acts on the third filter medium 33 in the radial direction, the third filter medium 33 is maintained in a prescribed shape. *

The third frame 43 is in strong contact with the third filter medium 33 by the large-diameter beam 43f. For this reason, in the temporary assembly state in which the third frame 43 is positioned in the third filter medium 33, the third frame 43 is prevented from falling out of the third filter medium 33. For example, in the joining process of joining the third filter medium 33 and the third frame 43 to the first end plate 45 and the third end plate 47, the third filter medium 33 and the third frame 43 are handled as an integrated part. Can do. Therefore, according to this structure and manufacturing method, the element 13 can be easily manufactured.

The first end plate 45 has a spacer 45b that is in contact with the open end 21a of the cap 21 and that defines a fuel passage. For this reason, the inclination of the element 13 is suppressed. The element 13 is accommodated at a predetermined position between the upper case 11 and the lower case 12. Moreover, even if the element 13 contacts the opening end 21a, a fuel passage is ensured. *

(2nd Embodiment) This embodiment is a modification which makes previous embodiment a basic form. In the above embodiment, the thick pillar 41m having a trapezoidal cross section is employed. Instead of this, various shapes of thick pillars can be employed. *

As shown in FIG. 15, the first frame 41 may employ a thick pillar 241m having a triangular cross section. Even in this shape, the first frame 41 having high rigidity is provided while suppressing resistance to fuel. *

(3rd Embodiment) This embodiment is a modification which makes previous embodiment a basic form. As shown in FIG. 16, the first frame 41 may employ a thick pillar 341m having a square cross section with rounded corners on the radially outer side. Even in this shape, the same effect as the preceding embodiment can be obtained. *

(4th Embodiment) This embodiment is a modification which makes previous embodiment a basic form. In the above embodiment, two ribs 48 a and 48 b that are separated in the axial direction are provided on the second frame 42. Instead of this, various shapes of ribs can be employed. *

As illustrated in FIG. 17, the second frame 42 may include a lower rib 448 positioned also on the radially outer side of the end beam 42 c. Even in this shape, the second frame 42 can support the first frame 41 from the radially inner side. Moreover, the deformation of the outer layer and the inner layer in the radial direction can be suppressed at the lower end of the element 13. *

(Fifth Embodiment) This embodiment is a modification in which the preceding embodiment is a basic form. As illustrated in FIG. 18, the second frame 42 may include a rib 548 that extends over the entire length of the second frame 42 in the axial direction. Even in this shape, the same effect as the preceding embodiment can be obtained. *

(Sixth Embodiment) This embodiment is a modification in which the preceding embodiment is a basic form. As illustrated in FIG. 19, the second frame 42 may include an independent central rib 648 at the central portion in the axial direction of the second frame 42. Even in this shape, the same effect as the preceding embodiment can be obtained. *

(Seventh Embodiment) This embodiment is a modification example in which the preceding embodiment is a basic form. In the above embodiment, the rib 48 is bridged between the first frame 41 and the second frame 42. Instead, various configurations can be adopted for the connection between the first frame 41 and the second frame 42. *

FIG. 20 shows an exploded state of the first frame 41 and the second frame 42. As illustrated, the second frame 42 includes an end beam 742b formed by an annular plate. The end beam 742 c provides a plane that faces the first end plate 45. In this embodiment, the upper plane of the end beam 742b is bonded to the adhesive layer 51. The second frame 42 includes only the central rib 648. The first frame 41 has a receiving groove 41e that can receive the end beam 742b. In this embodiment, the fitting structure as a positioning mechanism that provides the circumferential positioning of the first frame 41 and the second frame 42 is not provided. *

FIG. 21 is a view taken along arrow XXI in FIG. As illustrated, the rib 648 is oriented in any direction with respect to the circumferential direction. Therefore, the rib 648 may be disposed inside the opening 41a. The rib 648 is supported from the radially inner side of the first frame 41 by contacting the inner surface of the first frame 41. *

According to this embodiment, even if the rib 648 is disposed inside the opening 41a, the rib 648 has a plate shape, and thus the resistance to the fuel flow is low. Even in this shape, the second frame 42 can support the first frame 41 from the radially inner side. *

(Eighth Embodiment) This embodiment is a modification example in which the preceding embodiment is a basic form. As illustrated in FIG. 22, the first frame 41 may include a rib 848. The second frame 42 may be configured without the rib 48. *

FIG. 23 is a view taken along arrow XXIII in FIG. The plurality of ribs 848 extend radially inward from the inner surface of the first frame 41. The plurality of ribs 848 are integrally formed with the plurality of columns 41m of the first frame 41 by resin. The first frame 41 and the second frame 42 include a positioning mechanism for positioning the plurality of ribs 848 on the radially outer side of the plurality of pillars 42f of the second frame. The distal end surface on the radially inner side of the rib 848 is positioned so as to be in contact with or in close proximity to the outer surface of the beams 42b, 42c, 42d of the second frame 42 or the outer surface of the column 42f. Even in this shape, the second frame 42 can support the first frame 41 from the inside in the radial direction via the rib 848. *

(Ninth Embodiment) This embodiment is a modification in which the preceding embodiment is a basic form. In the above embodiment, the first end plate 45 has the spacers 45b arranged radially. Instead, the first end plate 45 can employ spacers having various shapes. *

In FIG. 24, the first end plate 45 has a short spacer 945b provided corresponding to only a portion that can come into contact with the opening end 21a. The short spacers 945b are provided by radially extending ridges. The short spacer 945b is provided at least on the outer peripheral portion of the disc portion 45a. The short spacer 945 b defines the fuel passage while suppressing the inclination of the element 13. *

(Tenth Embodiment) This embodiment is a modification example in which the preceding embodiment is a basic form. In FIG. 25, the first end plate 45 has three spacers A45b arranged radially. The spacer A45b is provided by radially extending protrusions. Also in this embodiment, the same effect as the preceding embodiment can be obtained. *

(Eleventh Embodiment) This embodiment is a modification example in which the preceding embodiment is a basic form. In the said embodiment, the large diameter part 42k is divided and formed by the cylindrical inner surface. Instead, various shapes of large diameter portions can be employed to accept the adhesive layer 53. *

In FIG. 26, the end beam 42c has a large-diameter portion B42k defined by two conical inner surfaces arranged opposite to each other. The large-diameter portion B42k can also store the adhesive layer 53 that flows out. *

(Twelfth embodiment) This embodiment is a modified example based on the preceding embodiment. In FIG. 27, the end beam 42c has a large-diameter portion C42k that is partitioned by a concave curved surface toward the radially outer side. Also in this embodiment, the same effect as the preceding embodiment can be obtained. *

(Other Embodiments) The disclosure of this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations by those skilled in the art based thereon. For example, the disclosure is not limited to the combinations of parts and / or elements shown in the embodiments. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes those in which parts and / or elements of the embodiments are omitted. The disclosure encompasses the replacement or combination of parts and / or elements between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. Some technical scope disclosed is indicated by the description of the claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the claims. . *

For example, in the said embodiment, the filter 10 which can replace | exchange element 13 is provided. Alternatively, part or all of the element 13 and the cup 26 may be connected so as not to be disassembled, and a cartridge-type filter in which they can be replaced may be provided. *

Moreover, the shape of the 1st filter medium 31, the 2nd filter medium 32, and the 3rd filter medium 33 is not limited to the shape shown in figure. For example, the second filter medium 32 may be provided by a filter medium folded in a pleat shape. The third filter medium 33 may be provided by a mesh that is not bent into a pleat shape, or a non-woven fabric. Further, each of the first filter medium 31, the second filter medium 32, and the third filter medium 33 may be provided by a single-layer or multilayer filter medium. *

Some of the plurality of members that provide the frame 40 may be integrally formed. For example, the first frame 41 and the second end plate 46 may be integrally molded with resin. For example, the first frame 41 and the second frame 42 may be integrally formed with resin. In this configuration, a cylindrical outer frame is provided. The outer peripheral portion of the outer frame is defined by a plurality of beams, a plurality of columns, and a plurality of ribs. This outer peripheral portion is given a thickness corresponding to the separation chamber 36. The fuel can flow radially and axially in this outer peripheral portion. *

Further, various structures may be employed instead of the plurality of spacers 45b, 945b, and A45b. For example, a corrugated plate may be provided along the outer peripheral portion of the disc portion 45a. Moreover, you may provide the several recessed part opened to an upper surface and an outer peripheral surface in the outer peripheral part of the disc part 45a. Even in these configurations, the element 13 can be stably positioned on the cap 21 while avoiding the blocking of the open end 21a by the disc portion 45a.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims (12)

1. Cylindrical filter media (31, 33) which are bent in a pleat shape so as to form a plurality of ridges extending in the axial direction on the inner surface, are arranged in an annular shape, and filter the fuel flowing from the outside to the inside along the radial direction A plurality of openings (41a, 43a) that are arranged on the inner side in the radial direction of the filter medium and that define the plurality of openings (41a, 43a) through which the fuel passes, and that support the filter medium from the inner side in the radial direction (41, 43), The frame is provided in an intermediate portion in the axial direction, and is provided with annular protrusions (41i, 43g) that support the filter medium from the inside in the radial direction. A plurality of intermediate beams (41h, 43e, 43f) and a plurality of columns (41j) extending in the axial direction and arranged radially inward from the annular protrusion, and connecting the plurality of intermediate beams 43i Element with the, and.
2. 2. The element according to claim 1, wherein the frame is further provided at both ends in the axial direction, extends across the ridge, and supports an end beam (41 b, 41 c, 43 b) that supports the filter medium from the inside in the radial direction. 43c).
3. The element according to claim 2, wherein the filter medium is a first filter medium (31) disposed in contact with the end beam, and further, in contact with the annular protrusion provided by the intermediate beam. A cylindrical second filter medium (32) is provided, and the ridge is arranged to face the annular protrusion through the second filter medium.
4. The element according to claim 2, wherein the filter medium (33) is disposed in contact with the end beam and the intermediate beam.
5. A tubular filter medium (33) for filtering fuel flowing from the outside to the inside along the radial direction, and disposed in the radial inside of the filter medium, and defining a plurality of openings (43a) through which the fuel passes, A frame (43) that supports the filter medium from the inside in the radial direction, an end plate (45) that is disposed at an end of the filter medium and the frame and that defines an opening (49a) of a fuel outlet passage, and the filter medium and An adhesive layer (51) for joining the frame and the end plate is provided, and the frame has a plurality of rod-like legs (43j, 43k) joined to the end plate by being inserted into the adhesive layer. element.
6. 6. The element according to claim 5, wherein the plurality of leg portions are positioned away from the opening in the end plate in the radial direction.
7. 6. The element according to claim 5, wherein the frame further includes a plurality of beams (43b, 43c, 43d) and a column (43i) for defining the fuel passage in the frame, and the plurality of legs. Are arranged so as to define an inner diameter (D43W) larger than an inner diameter (D43N) defined by the beam and the column.
8. A cylindrical filter medium (33) for filtering fuel, and a frame that is arranged radially inside the filter medium and defines a plurality of openings (43a) that allow the fuel to pass through, and supports the filter medium from the radially inner side (43), and the frame includes a connecting portion (43h) that prevents the frame from falling off the filter medium by contacting the inner surface of the filter medium.
9. The element according to claim 8, wherein the filter medium is a filter medium bent in a pleat shape so as to form a plurality of ridges extending in the axial direction on an inner surface, and the frame is provided in an intermediate part in the axial direction. And having a plurality of annular intermediate beams (43d) extending across the peak, the plurality of intermediate beams including an intermediate beam including the connecting portion and an intermediate beam not including the connecting portion.
10. A tubular first filter medium (31) that is bent in a pleat shape so as to form a plurality of axially extending peaks on the inner surface, is arranged in an annular shape, and filters the fuel flowing from the outside to the inside along the radial direction. And a cylindrical second filter medium (32) having a predetermined thickness along the radial direction, arranged on the radial inner side of the first filter medium, and arranged on the radial inner side of the second filter medium, A plurality of openings (41a) for allowing fuel to pass therethrough, and a frame (41) for supporting the first filter medium and the second filter medium from a radially inner side, wherein the frame is provided at an end in the axial direction. An annular end beam that is provided and extends across the peak and has two end beams (D41L) having a predetermined end outer diameter (D41L) and supporting the first filter medium from the radially inner side ( 41b, 41c) and between the two end beams A small outer diameter (D41S) smaller than the end outer diameter and supporting the second filter medium from the inside in the radial direction; and between the two end beams An annular intermediate beam extending across the peak and having an intermediate outer diameter (D41M) smaller than the outer diameter of the end and larger than the small outer diameter, and the first filter medium and the The element provided with the intermediate beam (41h) which supports both a 2nd filter medium from radial inside.
11. The element according to claim 10, wherein the second filter medium is in contact with a radially outer surface of the small diameter part, and the first filter medium and the second filter medium are disposed on a radially outer side of the small diameter part. A gap is formed between them.
12. A fuel filter comprising: the element according to any one of claims 1 to 11; and a case (11, 12) that houses the element and allows fuel supplied to an internal combustion engine to pass through the element.

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