JP6572666B2 - Oil filter and internal combustion engine - Google Patents

Description

  The present invention relates to an oil filter provided in an engine for filtering engine oil and an internal combustion engine.

  Engine oil is used to lubricate the components that make up the engine, but this engine is made by casting or forging a rough material for each member, and then machining it in various ways. For this reason, cutting dust and burrs are mixed in the engine oil filled in the engine, which enters the sliding part and wears out the part, so that it is completely removed. For this purpose, an oil filter is used in order to remove insoluble components in oil mainly composed of combustion products.

  As shown in FIGS. 3 and 4, the oil filter 10 </ b> X according to the prior art is configured to include a cylindrical portion 11 and a mounting portion 12. The cylindrical portion 11 includes a filter element 13, a support spring 14, and a relief valve 15. The mounting portion 12 is provided with an oil inlet passage 16 and an oil outlet passage 17.

  In normal use, as shown in FIG. 3, the dirty oil that has entered from the oil inlet passage 16 is filtered while flowing through the inside of the filter element 13 from the outside to the inside of the filter element 13. The oil becomes clean and flows out into the central portion of the cylinder portion 11 and exits from the oil outlet passage 17.

  On the other hand, when the filter element 13 is clogged or the oil temperature is low and the viscosity is high, the oil flow in the filter element 13 is stagnated and the pressure on the inflow side of the filter element 13 is increased. 4, the relief valve 15 is opened, and dirty oil flows from the outside of the filter element 13 to the support spring 14 side, as shown in FIG. The pressure on the inlet side rises and the relief valve 15 is opened. The dirty oil passes through the relief valve 15, flows out into the central portion of the cylinder portion 11, and exits from the oil outlet passage 17.

  That is, since the passage that bypasses the filter element 13 is formed by opening the relief valve 15, when oil passes through the oil filter 10 through this bypass passage, the dirty oil is not filtered by the filter element 13. In addition, the inside of the engine circulates in a dirty state.

  In this connection, one of the valve body and valve seat of the oil filter pressure relief valve is formed of a magnet, and the other member is formed of a magnetic body or magnet to support the valve body in a freely displaceable manner. The support body is made of a non-magnetic material, and the valve body is attracted to the valve seat by the magnetic force of one member to close the valve, thereby capturing metal wear powder such as iron powder contained in the oil when the valve is opened. An oil filter pressure relief valve has been proposed (see, for example, Patent Document 1).

  However, in the oil filter using the pressure relief valve for oil filter, when the pressure relief valve is opened, components that are not adsorbed by the magnet, such as insoluble matter in oil mainly composed of combustion products, can be removed. The pressure relief valve itself captures metal wear powder such as iron powder, which may impair the on-off valve function of the pressure relief valve, and the pressure relief valve during maintenance or when replacing the filter element There is a problem that an operation of removing metal wear powder adhering to the surface occurs.

JP 2007-291894 A

  The present invention has been made in view of the above, and an object of the present invention is to provide a relief valve in an oil filter provided in an internal combustion engine because the filter element is clogged or the oil temperature is low and the viscosity is large. Even when is operating, not only metal wear powder such as iron powder but also insoluble matter in oil mainly consisting of combustion products can be reliably captured and the filter function of the filter surface is efficient An object of the present invention is to provide an oil filter and an internal combustion engine which can be used well and can secure a wide effective filter area and which is easy to maintain.

In order to achieve the above object, an oil filter of the present invention includes a first filter portion having a cylindrical filter element, and an oil discharge passage formed inside the first filter portion and communicating with an oil outlet passage. When, in the oil filter with a relief valve provided at the inlet end of the discharge passage, the oil outlet communicating with said oil outlet passage of the discharge passage, than the pressure loss at the time of the oil passage in said first filter portion And a second filter portion having a small pressure loss when oil passes through , and the second filter portion is separated from the cylindrical portion on the side surface formed by a filter member for filtering the oil and the inlet. A bottom portion that leads to the cylindrical portion without passing through the opening, and an opening that is connected to the oil outlet passage on the opposite side to the bottom portion, and passes through the discharge passage. To the oil it is configured to flow in the tubular portion.

  According to this configuration, since the oil can be filtered by the second filter portion even when the relief valve is opened, not only the metal wear powder such as iron powder but also the insoluble component in the oil mainly composed of combustion products. Etc. can be reliably captured. In addition, since the second filter portion is separate from the relief valve, there is no possibility that the on-off valve function of the relief valve portion is impaired, and the work of removing metal wear powder adhering to the relief valve during maintenance is not required. Further, when the first filter part is inspected or replaced, the second filter part can be easily inspected and replaced.

  The oil filter is configured to include a cylindrical portion that supports the first filter portion with a support spring and accommodates it in a ring shape, and an attachment portion that includes an oil inlet passage and an oil outlet passage. A passage extending from the center of the support spring to the oil outlet passage through the inner center of the ring of the first filter portion, and the second filter portion on the oil outlet passage side of the discharge passage. If provided and configured, the second filter portion can be arranged inside the cylindrical portion without significantly changing the configuration of the oil filter of the prior art.

  In the above oil filter, when the filter element is formed of a folded filter member and the second filter part is formed of a mesh filter, the pressure loss when oil passes through the second filter part is reduced. It can be made smaller than the pressure loss when oil passes through one filter part. The second filter portion can be formed of a punching plate, a liquid gasket, or the like, but is preferably formed of a mesh-like goose filter that does not allow foreign matters of 1 mm or more to pass to the outlet side.

  In the oil filter, the second filter part is formed by a cylindrical part formed of a filter member that filters oil and a bottom part through which oil does not pass, and an opening part on the opposite side of the bottom part of the cylindrical part is formed in the oil filter. When connected to the oil outlet passage, the oil flow hits the bottom and flows to the cylindrical part on the side even when the oil viscosity is high at low temperatures of the oil, so the cylindrical part has a larger area than the bottom part. The provided filter member having a large filtration area can efficiently filter oil while suppressing an increase in flow resistance. According to this configuration, oil can be passed from a low temperature of about 5 ° C. to a very low temperature of about −20 to −30 ° C. without causing a problem of pressure loss.

  In the oil filter, an attachment opening is provided in the attachment portion (filter head) of the oil filter, and a cartridge fixing article as an insert member is detachably attached to the attachment opening. When the second filter part is fixed to the fixing opening provided on the relief valve side of the fixing article by press-fitting or the like, maintenance and inspection are facilitated and mass production is facilitated.

  In order to achieve the above object, an internal combustion engine of the present invention is configured to include the above oil filter, and can exhibit the same effects as the above oil filter.

  According to the oil filter and the internal combustion engine of the present invention, even when the filter element is clogged or the oil temperature is low and the viscosity is large and the relief valve is operating, the oil can be filtered by the second filter portion. Therefore, not only metal wear powder such as iron powder but also insoluble matter in oil mainly composed of combustion products can be reliably captured.

  Further, since the second filter portion is separated from the relief valve, there is no possibility that the on-off valve function of the relief valve is impaired, and the work of removing metal wear powder adhering to the relief valve during maintenance is not required. In addition, when the first filter unit is inspected or replaced, the second filter unit can be easily inspected and replaced, so that the maintenance labor is minimal.

It is a figure which shows typically the structure of the oil filter of embodiment which concerns on this invention. It is a figure which shows a state when a relief valve opens with the oil filter of FIG. It is a figure which shows typically the structure of the oil filter of a prior art which does not provide the 2nd filter part. It is a figure which shows a state when a relief valve opens with the oil filter of FIG.

  Hereinafter, an oil filter and an internal combustion engine according to an embodiment of the present invention will be described with reference to the drawings. Here, an oil filter of a type widely used in passenger cars and the like will be described, but the present invention is not limited to this configuration.

  As shown in FIGS. 1 and 2, the oil filter 10 includes a cylindrical tube portion (filter case) 11 and a mounting portion (filter head) 12, and the tube portion 11 is formed by a filter element. The first filter portion 13, the support spring (set spring) 14, and the relief valve (bypass valve: relief valve) 15 are accommodated, and the mounting portion 12 is provided with an oil inlet passage 16 and an oil outlet passage 17. . That is, the oil filter 10 includes a cylindrical portion 11 that supports the first filter portion 13 with a support spring 14 and accommodates it in a ring shape, and a mounting portion 12 that includes an oil inlet passage 16 and an oil outlet passage 17. To do.

  The filter element forming the first filter portion 13 is formed of a folded filter member, has a wider filtration area due to the folded state of the filter paper, and has a function of removing foreign matters and impurities in the oil. The inside of the first filter portion 13 becomes a filtered oil discharge passage 19.

The support spring 14 has a function of holding the filter element of the first filter unit 13 so as not to move by vibration or oil hydraulic pressure, and the relief valve 15 is used when starting the engine with low oil temperature and high viscosity. When the filter element of the first filter unit 13 is clogged, the valve is opened to ensure the circulation of oil into the engine. That is, a relief valve 15 is provided at the inlet of one end of the oil discharge passage 19 formed inside the first filter portion 13 and communicating with the oil outlet passage 17 .

  The present invention further includes a second filter portion 18 connected to the oil outlet passage 17 inside the cylinder portion 11. The second filter unit 18 is configured such that the pressure loss when oil passes is smaller than the pressure loss when oil passes through the first filter unit 13. That is, the pressure loss at the time of oil passage is more than the pressure loss at the time of oil passage in the first filter portion 13 in the discharge passage 19 that communicates with the oil outlet passage 17 and flows when the relief valve 15 opens. The second filter unit 18 having a small is provided.

  Although not particularly illustrated, the mounting portion 12 of the oil filter 10 is provided with an opening for mounting, and a cartridge fixing article as an insert member is detachably attached to the mounting opening, and the second filter portion 18 is attached. If the cartridge is fixed to the cartridge fixing article by press-fitting or the like, the cartridge fixing part to which the second filter portion 18 is fixed by press-fitting or the like can be attached and detached, so that maintenance and inspection are facilitated and mass production is facilitated.

  Further, the oil discharge passage 19 is formed as a passage from the center of the support spring 14 to the oil outlet passage 17 through the center inside the ring of the first filter portion 13, and the oil outlet passage 17 of the discharge passage 19 is formed. A second filter unit 18 is provided on the side. Thereby, the 2nd filter part 18 can be arrange | positioned inside the cylinder part 11, without changing the structure of the oil filter of a prior art significantly.

  The pressure loss when the oil passes through the second filter portion 18 needs to be small, and since it is necessary to remove relatively large impurities that are used for engine operation, the second filter portion 18 As the filter, a punching plate or the like may be used, but a coarse filter such as a goose filter is suitable, and a mesh filter is particularly suitable because the pressure loss is small. Thereby, the pressure loss at the time of oil passage of the 2nd filter part 18 can be made smaller than the pressure loss at the time of oil passage of the 1st filter part 13. The mesh filter may be made of metal or resin, but preferably has a durability and can easily clean impurities in the oil.

  Further, the second filter portion 18 is formed by a cylindrical portion 18a formed of a filter member for filtering oil and a bottom portion 18b through which oil does not pass, and an opening on the opposite side of the bottom portion 18b of the cylindrical portion 18a is formed as an oil outlet. It is configured to be connected to the passage 17. Thereby, oil is efficiently filtered with the filter member with a large filtration area provided in the cylindrical part 18a which has an area larger than the bottom part 18b.

  The bottom portion 18b of the second filter portion 18 is formed with a widened flange 18bc so that the edge 18bb of the bottom surface 18ba is rounded and the outer portion of the edge 18bb is outside the cylindrical portion 18a. In other words, as a result of having the widened flange 18bc, the outer diameter of the flange 18bc in the outer portion is wider than the diameter of the cylindrical portion 18a having the filter function.

  As shown in FIG. 1, in a normal state, dirty oil enters the cylinder portion 11 from the oil inlet passage 16 of the mounting portion 12, and the relief valve 15 on the lower side of the drawing is closed. It is filtered through the filter element of the filter unit 13 from the outside to the inside. The filtered oil flows out into the discharge passage 19 at the center of the filter element formed in a ring shape, that is, at the center of the cylinder portion 11, passes through the second filter portion 18, and exits from the oil outlet passage 17. . At this time, since only clean oil filtered by the first filter 13 having finer mesh than the second filter portion 18 passes, there is no possibility that the second filter portion 18 is clogged.

  On the other hand, when the filter element 13 is clogged, the oil flow is stagnated, and the pressure on the inflow side of the first filter portion 13 is increased, the filter element forming the first filter portion 13 is prevented from being damaged and the oil. In order to maintain the circulation, as shown in FIG. 2, the relief valve 15 is opened, and dirty oil flows from the outside of the first filter portion 13 toward the support spring 14, and the pressure on the inlet side of the relief valve 15. Rises and the relief valve 15 is opened. The dirty oil passes through the relief valve 15, flows out into the central portion of the cylinder portion 11, passes through the second filter portion 18, and then exits from the oil outlet passage 17.

  That is, even when a passage that bypasses the filter element 13 is formed by opening the relief valve 15, the dirty oil passes through the second filter portion 18 having a relatively coarse mesh. Not only powder but also relatively large impurities such as insoluble matter in oil mainly composed of combustion products are circulated in the engine while being removed by filtration.

  And the internal combustion engine of embodiment which concerns on this invention is provided with the oil filter 10 of embodiment which concerns on this invention.

  Therefore, according to the oil filter 10 and the internal combustion engine configured as described above, when the filter element of the first filter portion 13 is clogged or the oil temperature is low and the viscosity is large, the relief valve 15 is operating. However, since the oil can be filtered by the second filter portion 18, not only metal wear powder such as iron powder but also insoluble matter in oil mainly composed of combustion products can be reliably captured.

  Furthermore, since the bottom portion 18b of the second filter portion 18 is formed of a member through which oil does not pass, the oil flow hits the bottom portion 18b and flows to the cylindrical portion 18a on the side surface, so that the filter function of the filter surface can be used efficiently. Thus, a substantially effective filter area can be secured widely. Therefore, a filter member with a wide filtration area provided in the cylindrical portion 18a having a larger area than the bottom portion 18b can efficiently suppress the increase in flow resistance even when the viscosity of the oil is high at a low temperature of the oil. Can be filtered.

  Further, since the second filter portion 18 is separated from the relief valve 15, there is no possibility that the opening / closing valve function of the relief valve 15 portion is impaired, and the work of removing metal wear powder adhering to the relief valve 15 during maintenance is also possible. It becomes unnecessary. In addition, when the first filter unit 13 is inspected or replaced, the second filter unit 18 can be easily inspected and replaced.

  When a plate filter is installed at the position closest to the upstream side of the relief valve, it is difficult to secure the filter installation area, and the oil is not a member that does not allow oil to pass through the bottom surface (bottom) at the position immediately upstream of the oil outflow hole. When a cup-shaped filter is used as a filter through which the filter passes, the installation area of the filter can be secured. However, in actual use, the flow of oil flowing from the bottom of the cup-shaped filter It has been found that the inflow is hindered, and the filter function of the bottom surface of the cup-shaped filter is exhibited, but the filter function of the side surface is not exhibited, and a substantially effective filter area cannot be secured.

10 Oil filter 11 Tube (filter case)
12 Mounting part (filter head)
13 First filter portion 14 Support spring (set spring)
15 Relief valve (Bypass valve: Relief valve)
16 Oil inlet passage 17 Oil outlet passage 18 Second filter portion 18a Tubular portion 18b Bottom portion 18ba Bottom surface 18bb Edge 18bc 鍔 19 Discharge passage

Claims (5)

A first filter portion having a cylindrical filter element ; an oil discharge passage formed inside the first filter portion and communicating with an oil outlet passage; and a relief valve provided at an inlet of one end of the discharge passage. In the oil filter
At the oil outlet communicating with the oil outlet passage of the discharge passage, a second filter portion having a pressure loss at the time of oil passage smaller than a pressure loss at the time of oil passage in the first filter portion is provided,
The second filter part has a cylindrical part on a side surface formed by a filter member that filters oil, a bottom part that leads to the cylindrical part without passing the oil that is separated from the inlet, and is opposite to the bottom part With an opening connected to the oil outlet passage on the side,
An oil filter configured to allow oil passing through the discharge passage to flow through the cylindrical portion . The oil filter according to claim 1, wherein an edge of a bottom surface of the bottom portion is formed with a roundness. The oil filter according to claim 2, wherein an outer diameter of an outer portion of an edge of the bottom surface is formed to be larger than a diameter of the cylindrical portion. The filter element according to any one of claims 1 to 3, wherein the filter element is formed of a folded filter member, and the second filter portion is formed of a mesh-like goose filter that does not allow foreign matters of 1 mm or more to pass through to the outlet side. Oil filter. An internal combustion engine comprising the oil filter according to any one of claims 1 to 4 .

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