JP2018204675A - Vibration proofing device - Google Patents

Abstract

To elongate a length of an orifice passage while suppressing a dimension of an outer diameter of a ring portion.SOLUTION: A diaphragm member 18 includes a deformable diaphragm main body 19 configuring a part of a partition wall of an auxiliary liquid chamber 16, and a ring portion 20 disposed at an outer peripheral side of the diaphragm main body 19 and connected to a first mounting member 11. The ring portion 20 is provided with an outer orifice passage 26 communicated to one of a main liquid chamber and the auxiliary liquid chamber 16, and extended in a circumferential direction, a partitioning member is provided with a passage projection portion 27 projecting toward an auxiliary liquid chamber 16 side and fitted in the ring portion 20, and an inner orifice passage 30 extended in the circumferential direction and communicating the other of the main liquid chamber and the auxiliary liquid chamber 16, and the outer orifice passage 26, is formed between the passage projection portion 27 and an inner peripheral face of the ring portion 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vibration isolator that is applied to, for example, automobiles and industrial machines and absorbs and attenuates vibrations of a vibration generating unit such as an engine.

Conventionally, a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other, a first mounting member and a second mounting member And an elastic body that closes the opening on one side in the axial direction along the central axis of the first mounting member; and a diaphragm member that closes the opening on the other side in the axial direction of the first mounting member; A vibration isolator is known that includes a liquid chamber in a first mounting member, a partition member that partitions a main liquid chamber having an elastic body as a part of a partition wall and a sub liquid chamber having a diaphragm member as a part of the partition wall. ing.
As this type of vibration isolator, for example, as shown in Patent Document 1 below, a diaphragm member is disposed on a deformable diaphragm main body that forms a part of the partition wall of the auxiliary liquid chamber, and on the outer peripheral side of the diaphragm main body. A ring portion connected to the first mounting member, and an orifice passage that communicates between the main liquid chamber and the sub liquid chamber between the elastic body and the ring portion and extends in a circumferential direction around the central axis. The formed configuration is known.

JP 2009-2105050 A

  By the way, generally, in the vibration isolator, the arrangement space is severely limited and the outer diameter of the ring portion cannot be increased. Therefore, the length of the orifice passage cannot be increased, and it is difficult to improve the damping performance. There was a problem that there was.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a vibration isolator capable of increasing the length of an orifice passage while suppressing the size of the outer diameter of the ring portion. To do.

In order to solve the above problems, the present invention proposes the following means.
The vibration isolator according to the present invention includes a cylindrical first mounting member coupled to one of the vibration generating unit and the vibration receiving unit, a second mounting member coupled to the other, and the first mounting. An elastic body connecting the member and the second mounting member and closing an opening on one axial side along the central axis of the first mounting member; and the other axial side of the first mounting member A diaphragm member that closes the opening, a liquid chamber in the first mounting member, a main liquid chamber having the elastic body as a part of the partition wall, and a sub-liquid chamber having the diaphragm member as a part of the partition wall. A partition member for partitioning, the diaphragm member being disposed on a deformable diaphragm main body forming a part of a partition wall of the sub liquid chamber, and on an outer peripheral side of the diaphragm main body, and connected to the first mounting member. A ring part, and a front The ring portion is formed with an outer orifice passage communicating with one of the main liquid chamber and the sub liquid chamber and extending in a circumferential direction around the central axis, and the partition member includes the sub liquid chamber. A passage protrusion that protrudes toward the chamber and is fitted into the ring portion is formed, and extends between the passage protrusion and the inner peripheral surface of the ring portion in the circumferential direction, and the main liquid chamber In addition, an inner orifice passage that communicates either one of the sub liquid chambers and the outer orifice passage is formed.

According to the present invention, the flow path that connects the main liquid chamber and the sub liquid chamber is not only the outer orifice passage formed in the ring portion, but also between the passage protrusion of the partition member and the inner peripheral surface of the ring portion. Since the inner orifice passage formed in is also provided, the flow path length can be increased. In addition, since the inner orifice passage is disposed on the inner peripheral surface side of the ring portion, it is possible to suppress an increase in the outer diameter of the ring portion.
In addition, since the passage protrusion that forms the inner orifice passage is formed in the partition member and fitted in the ring portion, it is possible to prevent the design change of other parts while preventing the number of parts from increasing.
The outer orifice passage may communicate with the main liquid chamber, and the inner orifice passage may communicate with the sub liquid chamber. In this case, it is possible to easily form a vibration isolator having the above-described effects.

  Here, of the circumferential end portions of the outer orifice passage, one end portion communicates with the circumferential end portion of the inner orifice passage, and the other end portion communicates with the main liquid chamber. The other end in the circumferential direction of the inner orifice passage may communicate with the sub liquid chamber.

  In this case, both ends in the circumferential direction of the outer orifice passage communicate with the inner orifice passage and the main liquid chamber, respectively, and both ends in the circumferential direction of the inner orifice passage respectively connect to the outer orifice passage and the sub liquid chamber. Since the fluid is communicated with each other, the liquid can be smoothly circulated between the main liquid chamber and the sub liquid chamber without causing, for example, a back flow, and the flow that communicates between the main liquid chamber and the sub liquid chamber. The length of the road can be ensured to be long.

  In addition, the passage protrusion protrudes from the partition member toward the auxiliary liquid chamber side and extends in the circumferential direction, and the axial protrusion is provided between the partition member and the side peripheral wall whose front and back surfaces face the radial direction. In a state where a gap is provided, a bottom wall that protrudes radially outward from the side peripheral wall and a tip edge of which abuts against the inner peripheral surface of the ring portion may be provided.

  In this case, it is possible to reliably realize that design changes of other components are suppressed while preventing an increase in the number of components.

  Further, the ring portion is formed with a groove portion that opens toward the partition member side and extends in the circumferential direction, and a lateral opening that communicates the inside of the circumferential end portion of the groove portion with the inside of the diaphragm main body, The groove portion and the side opening are covered with the partition member to define the outer orifice passage, and a circumferential end portion of the passage protrusion is formed in the circumferential end portion of the groove portion through the side opening. May be located.

  In this case, since the circumferential end portion of the passage protrusion is located in the circumferential end portion of the groove portion through the side opening, the outer orifice passage and the inner orifice passage are easily and reliably connected in a liquid-tight manner. be able to.

  According to the present invention, the length of the orifice passage can be increased while suppressing the outer diameter of the ring portion.

It is the longitudinal cross-sectional view seen from one direction of the vibration isolator which concerns on one Embodiment of this invention. It is the longitudinal cross-sectional view seen from the other direction orthogonal to one direction of the vibration isolator which concerns on one Embodiment of this invention. It is AA arrow sectional drawing of the vibration isolator shown to FIG. 1 and FIG. It is a cross-sectional view of the partition member of the vibration isolator shown in FIGS. It is the perspective view which looked at the partition member shown in FIG. 4 from the downward direction.

Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the vibration isolator 1 includes a cylindrical first mounting member 11 connected to one of the vibration generating unit and the vibration receiving unit, and a second connected to the other. The main liquid chamber having the mounting member 12, the elastic body 13 connecting the first mounting member 11 and the second mounting member 12, the liquid chamber 14 in the first mounting member 11, and the elastic body 13 as a part of the partition wall. 15, and a partition member 17 that partitions the sub-liquid chamber 16, and a diaphragm member 18 that forms a part of the partition wall of the sub-liquid chamber 16. In the illustrated example, the partition member 17 partitions the liquid chamber 14 in the axial direction along the central axis O of the first mounting member 11.

When the vibration isolator 1 is used as, for example, an engine mount of an automobile, the first mounting member 11 is connected to the vehicle body as the vibration receiving portion, and the second mounting member 12 is connected to the engine as the vibration generating portion. . This suppresses transmission of engine vibration to the vehicle body.
Hereinafter, the main liquid chamber 15 side along the axial direction with respect to the partition member 17 is referred to as an upper side, and the sub liquid chamber 16 side is referred to as a lower side. Further, in a plan view of the vibration isolator 1 viewed from the axial direction, a direction orthogonal to the central axis O is referred to as a radial direction, and a direction around the central axis O is referred to as a circumferential direction.

The first mounting member 11 includes a small-diameter portion 11a located at the upper end portion, a large-diameter portion 11b that is located below the small-diameter portion 11a and has a larger diameter than the small-diameter portion 11a, and a lower-end portion and a large-diameter portion of the small-diameter portion 11a. A connecting portion 11c that connects the upper end portion of the diameter portion 11b. The connecting portion 11c is bent such that the outer peripheral surface is recessed toward the inner side in the radial direction, and the inner peripheral surface protrudes toward the inner side in the radial direction. The lower end portion of the large-diameter portion 11b is bent toward the inside in the radial direction.
The second attachment member 12 is disposed above the first attachment member 11 and has an attachment hole 12a that opens in one of the radial directions. The second attachment member 12 is formed in a cylindrical shape extending in the one direction.

  The elastic body 13 connects the inner peripheral surfaces of the small diameter portion 11 a and the connecting portion 11 c in the first mounting member 11 and the second mounting member 12. The elastic body 13 closes the upper end opening of the first mounting member 11. The elastic body 13 is vulcanized and bonded to the first mounting member 11 and the second mounting member 12. The elastic body 13 is formed in a crested cylindrical shape and is arranged coaxially with the central axis O. Of the elastic body 13, the top wall portion is connected to the second mounting member 12, and the lower end portion of the peripheral wall portion is connected to the first mounting member 11. The peripheral wall portion of the elastic body 13 gradually extends outward in the radial direction from the upper side toward the lower side. The elastic body 13 is integrally formed with a covering rubber that covers the inner peripheral surface of the large-diameter portion 11 b of the first mounting member 11.

The diaphragm member 18 closes the lower end opening of the first mounting member 11. The diaphragm member 18 and the elastic body 13 define a liquid chamber 14 in which a liquid is enclosed in the first mounting member 11. In addition, as a liquid enclosed with the liquid chamber 14, water, ethylene glycol, etc. can be used, for example.
The diaphragm member 18 includes a deformable diaphragm main body 19 that forms a part of the partition wall of the sub liquid chamber 16, and a ring portion 20 that is disposed on the outer peripheral side of the diaphragm main body 19 and connected to the first mounting member 11. Prepare.

The ring part 20 is liquid-tightly fitted in the large diameter part 11b of the first mounting member 11 via the covering rubber. The ring portion 20 may be attached to the first attachment member 11 in a state of protruding downward from the first attachment member 11.
The ring portion 20 has a groove portion 20a that opens upward and extends in the circumferential direction, and a side opening 20b that communicates the end portion in the circumferential direction of the groove portion 20a with the inside of the diaphragm body 19 as shown in FIG. And are formed.

The groove width of the groove 20a is the same over the entire length. Of both ends in the circumferential direction of the groove portion 20a, one end portion communicates with the inside of the diaphragm main body 19 through the side opening 20b.
The groove portion 20 a includes an outer peripheral wall 21 positioned on the outer side in the radial direction, an inner peripheral wall 22 positioned on the inner side in the radial direction of the outer peripheral wall 21, and a bottom plate wall 23 that connects the lower ends of the outer peripheral wall 21 and the inner peripheral wall 22. And is defined by. The outer peripheral wall 21, the inner peripheral wall 22 and the bottom plate wall 23 are arranged coaxially with the central axis O. As shown in FIGS. 1 and 2, the upper end portion of the outer peripheral wall 21 is located above the upper end portion of the inner peripheral wall 22. The outer peripheral wall 21 is fitted into the large-diameter portion 11 b of the first mounting member 11, and the upper end portion of the outer peripheral wall 21 is positioned slightly below the connecting portion 11 c of the first mounting member 11.

The groove 20a and the side opening 20b are covered from above the ring part 20 by the lower surface of the partition member 17, so that an outer orifice passage 26 communicating with the main liquid chamber 15 through the communication opening 17a described later is defined. The cross-sectional area of the outer orifice passage 26 is the same over the entire circumference. As shown in FIG. 3, the outer orifice passage 26 is disposed over an angular range greater than 270 ° and less than 360 ° centered on the central axis O. The outer orifice passage 26 is formed in a single arc shape centering on the central axis O over the entire circumference.
The outer orifice passage 26 may be defined by the groove 20a and the side opening 20b being covered from above the ring part 20 by the lower end opening edge of the elastic body 13.

  The ring portion 20 is formed of an elastic material, and a reinforcing metal fitting 20c is embedded therein. The reinforcing metal fitting 20c is embedded in each of the outer peripheral wall 21, the inner peripheral wall 22, and the bottom plate wall 23 that define the groove 20a. The reinforcing metal fitting 20c is bent and formed integrally with each of the outer peripheral wall 21, the inner peripheral wall 22, and the bottom plate wall 23.

  The diaphragm main body 19 is formed in a bottomed cylindrical shape disposed coaxially with the central axis O. The peripheral wall portion of the diaphragm main body 19 is formed integrally with the inner peripheral wall 22 of the ring portion 20. As shown in FIG. 1 and FIG. 2, a portion of the bottom wall portion of the diaphragm main body 19 that is located on the inner side in the radial direction from the outer peripheral edge portion bulges upward. The outer peripheral edge portion of the bottom wall portion of the diaphragm main body 19 is located below the ring portion 20. The diaphragm main body 19 expands and contracts as the liquid flows into and out of the sub liquid chamber 16.

  The partition member 17 is formed in a disk shape whose front and back surfaces are orthogonal to the central axis O, and is disposed inside the first mounting member 11. In the illustrated example, the partition member 17 is fitted inside the portion of the outer peripheral wall 21 of the ring portion 20 that is located above the inner peripheral wall 22. The lower surface of the partition member 17 is in liquid-tight contact with the upper end edge of the inner peripheral wall 22 of the ring portion 20.

  The partition member 17 is formed with a communication opening 17 a that allows the main liquid chamber 15 and the outer orifice passage 26 to communicate with each other. As shown in FIG. 3, the communication opening 17 a is opened at a portion of the outer orifice passage 26 defined by the other end in the circumferential direction of the groove 20 a (hereinafter referred to as the other end). Yes. That is, the other end of the outer orifice passage 26 communicates with the main liquid chamber 15. As shown in FIGS. 4 and 5, the communication opening 17 a is formed at the outer peripheral edge of the partition member 17 and penetrates the partition member 17 in the axial direction and opens outward in the radial direction. As illustrated in FIG. 2, the communication opening 17 a is covered from the radially outer side of the communication opening 17 a by the inner peripheral surface of the outer peripheral wall 21 of the ring portion 20.

  As shown in FIG. 2 and FIG. 4, in the upper surface of the partition member 17, a recess 17 b is formed in a portion that is continuous with the communication opening 17 a from the inside in the radial direction of the communication opening 17 a. The outer end portion in the radial direction of the hollow portion 17b and the circumferential size of each of the communication openings 17a are equal to each other. The magnitude | size of the circumferential direction of the hollow part 17b is gradually enlarged as it goes outside from the inner side of radial direction.

  The partition member 17 is formed with a storage chamber 25 in which the membrane 24 is stored in a deformable or displaceable manner. The storage chamber 25 is formed in a half ring shape centering on the central axis O in a cross-sectional view orthogonal to the axial direction of the partition member 17, and an outer peripheral portion thereof opens to the outer peripheral surface of the partition member 17. Yes. The outer peripheral portion of the storage chamber 25 is closed by the inner peripheral surface of the outer peripheral wall 21 of the ring portion 20. The storage chamber 25 is disposed in a part of the partition member 17 that is separated from the communication opening 17a and the recess 17b in the circumferential direction. The size in the circumferential direction of the storage chamber 25 is larger than the size in the circumferential direction of the recess 17b. The radially inner ends of the storage chamber 25 and the recess 17b are located on the same arc centered on the central axis O.

The membrane 24 is formed in a plate shape by an elastic material such as rubber. The membrane 24 is formed in the same shape as the storage chamber 25 and is slightly smaller than the storage chamber 25.
As shown in FIG. 5, the partition member 17 has a first communication hole 17 c that communicates the storage chamber 25 and the main liquid chamber 15, and a second communication hole 17 d that communicates the storage chamber 25 and the sub liquid chamber 16. Is formed. The first communication hole 17c and the second communication hole 17d have the same shape and the same size. A plurality of first communication holes 17c and second communication holes 17d are formed in the partition member 17 at intervals in the circumferential direction, and face each other in the axial direction.

  In the present embodiment, as shown in FIGS. 2 and 3, the partition member 17 is formed with a passage protrusion 27 that protrudes toward the auxiliary liquid chamber 16 and is fitted in the ring portion 20. Yes. An inner orifice passage 30 that extends in the circumferential direction and communicates the outer orifice passage 26 and the auxiliary liquid chamber 16 is formed between the passage protrusion 27 and the inner peripheral surface of the ring portion 20.

  The passage protrusion 27 protrudes from the partition member 17 toward the sub liquid chamber 16 side and extends in the circumferential direction, and an axial gap is provided between the partition member 17 and the side peripheral wall 28 whose front and rear surfaces face the radial direction. In a state of being provided, a bottom wall 29 that protrudes radially outward from the side peripheral wall 28 and whose tip edge contacts the inner peripheral surface of the ring portion 20 is provided. A radial gap is provided between the side peripheral wall 28 and the inner peripheral surface of the ring portion 20. The circumferential length and the circumferential position of the side circumferential wall 28 and the bottom wall 29 are equal to each other. The width of the bottom wall 29 is the same over the entire circumference. The tip edge of the bottom wall 29 is in liquid-tight contact with the inner peripheral surface of the ring portion 20 over the entire periphery. A space surrounded by the side peripheral wall 28, the bottom wall 29, the inner peripheral wall 22 of the ring portion 20, and the lower surface of the partition member 17 is an inner orifice passage 30.

  Of the circumferential end portions of the passage protrusion 27, one end portion is located in the one end portion of the groove portion 20a through the side opening 20b, and the other end portion is in the sub liquid chamber 16. Is located. As a result, a portion (hereinafter referred to as one end portion) 30a of the inner orifice passage 30 that is defined by the one end portion of the passage protrusion 27 is referred to as the groove portion 20a of the outer orifice passage 26. A portion of the inner orifice passage 30 is defined by the other end of the passage protrusion 27 (hereinafter referred to as the other end). , Communicated with the auxiliary liquid chamber 16.

In the illustrated example, the edge on the one side of the side peripheral wall 28 of the passage protrusion 27 abuts on the edge on the one side of the inner peripheral wall 22 that defines the groove 20a, and the lower surface of the bottom wall 29 is The bottom plate wall 23 defining the groove 20a is in contact with the upper surface of the one end.
The radial distance between the other end of the inner orifice passage 30 and the central axis O is equal to the radial distance between the second communication hole 17d and the central axis O. The other end of the inner orifice passage 30 is adjacent to the second communication hole 17d in the circumferential direction.

  The inner orifice passage 30 is disposed on the opposite side of the second communication hole 17d that sandwiches the central axis O in the radial direction. The cross-sectional area of the inner orifice passage 30 is the same over the entire circumference. The inner orifice passage 30 is disposed over an angular range of about 180 ° centered on the central axis O. The entire inner orifice passage 30 and the outer orifice passage 26 are disposed over an angular range exceeding 360 ° with the central axis O as the center. The circumferential length of the inner orifice passage 30 is shorter than the circumferential length of the outer orifice passage 26. The circumferential length of the inner orifice passage 30 may be equal to or greater than the circumferential length of the outer orifice passage 26. Each of the inner orifice passage 30 and the outer orifice passage 26 has an axial size, an axial position, and a flow path cross-sectional area that are equal to each other over the entire circumference.

  The other half of the inner orifice passage 30 has a single arc shape centered on the central axis O in a plan view viewed from the axial direction. The half on the one side of the inner orifice passage 30 is formed by connecting a plurality of arc portions having different radial directions in the plan view in the circumferential direction. In the plan view, the radius of curvature of a single circular arc extending across the entire circumference without intersecting the inner peripheral surface of the side peripheral wall 28 and the tip edge of the bottom wall 29 inside the one half of the inner orifice passage 30 Is larger than the radius of curvature at the outer peripheral edge of the other half of the inner orifice passage 30.

  The one end portion 30a of the inner orifice passage 30 has a curved shape that protrudes radially outward in the plan view. A connection portion 30b of the half on the one side of the inner orifice passage 30 with the half on the other side has a curved shape that protrudes radially inward in the plan view. In the plan view, the radius of curvature of the one end 30a of the inner orifice passage 30 is smaller than the radius of curvature of the connecting portion 30b with the other half of the one half of the inner orifice passage 30. Yes. Of the inner orifice passage 30, the one end portion 30 a is located on the outer side in the radial direction as compared with the other portion. The radial positions of the one end 30a of the inner orifice passage 30 and the outer orifice passage 26 are equal to each other.

As described above, according to the vibration isolator 1 according to the present embodiment, the flow path connecting the main liquid chamber 15 and the sub liquid chamber 16 is not limited to the outer orifice passage 26 formed in the ring portion 20. Since the inner orifice passage 30 formed between the passage protrusion 27 of the partition member 17 and the inner peripheral surface of the ring portion 20 is also provided, the flow path length can be increased. Moreover, since the inner orifice passage 30 is disposed on the inner peripheral surface side of the ring portion 20, it is possible to suppress an increase in the outer diameter of the ring portion 20.
In addition, since the passage protrusion 27 that forms the inner orifice passage 30 is formed in the partition member 17 and fitted in the ring portion 20, the design of other parts can be changed while preventing the number of parts from increasing. Can be suppressed.

  Further, both ends in the circumferential direction of the outer orifice passage 26 communicate with the inner orifice passage 30 and the main liquid chamber 15 respectively, and both ends in the circumferential direction of the inner orifice passage 30 respectively Since the sub liquid chambers 16 communicate with each other separately, the liquid can be smoothly circulated between the main liquid chamber 15 and the sub liquid chamber 16 without causing, for example, a backflow or the like. The length of the flow path communicating with the sub liquid chamber 16 can be ensured to be long.

Moreover, since the channel | path protrusion 27 is provided with the side peripheral wall 28 and the bottom wall 29, it can implement | achieve reliably suppressing the design change of another component, preventing the increase in a number of components.
Further, since the circumferential end of the passage protrusion 27 is located in the circumferential end of the groove 20a through the side opening 20b, the outer orifice passage 26 and the inner orifice passage 30 can be easily and reliably connected to the liquid. Can be connected closely.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the configuration in which the outer orifice passage 26 communicates with the main liquid chamber 15 and the inner orifice passage 30 communicates with the sub liquid chamber 16 is shown. A configuration in which the inner orifice passage 30 communicates with the main liquid chamber 15 may be employed.
Further, in the above embodiment, both end portions in the circumferential direction of the outer orifice passage 26 respectively communicate with the inner orifice passage 30 and the main liquid chamber 15, respectively, and both end portions in the circumferential direction of the inner orifice passage 30 respectively. Although the configuration in which the outer orifice passage 26 and the auxiliary liquid chamber 16 communicate with each other has been shown, the present invention is not limited to this. For example, the inner orifice passage 30 and the main liquid chamber 15 communicate with each other in the middle of the outer orifice passage 26 in the circumferential direction. Alternatively, the outer orifice passage 26 and the auxiliary liquid chamber 16 may communicate with each other in the circumferential direction of the inner orifice passage 30.
Moreover, in the said embodiment, although the channel | path protrusion 27 showed the structure provided with the side surrounding wall 28 and the bottom wall 29, it replaces with this, for example, is more radial than the side surrounding wall 28, the bottom wall 29, and the side surrounding wall 28. You may change suitably, such as employ | adopting the structure provided with the outer wall located in the outer side, and fitted in the ring part 20. FIG.
Moreover, although the edge part of the circumferential direction in the channel | path protrusion 27 was located in the edge part of the circumferential direction in the groove part 20a through the side opening 20b, it replaced with this, for example, the periphery in the channel | path protrusion part 27 is shown. You may change suitably the edge of a direction, for example, butting against the opening peripheral part of the side opening 20b in the ring part 20. FIG.

In the above-described embodiment, the compression type vibration isolator 1 in which a positive pressure is applied to the main liquid chamber 15 when a support load is applied has been described. However, the main liquid chamber 15 is located on the lower side in the vertical direction, and The auxiliary liquid chamber 16 is attached so as to be positioned on the upper side in the vertical direction, and is applicable to a suspension type vibration isolator in which a negative pressure is applied to the main liquid chamber 15 when a support load is applied.
The vibration isolator 1 according to the present invention is not limited to an engine mount of a vehicle, and can be applied to other than the engine mount. For example, the present invention can be applied to a mount of a generator mounted on a construction machine, or can be applied to a mount of a machine installed in a factory or the like.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 11 1st attachment member 12 2nd attachment member 13 Elastic body 14 Liquid chamber 15 Main liquid chamber 16 Sub liquid chamber 17 Partition member 18 Diaphragm member 19 Diaphragm main body 20 Ring part 20a Groove part 20b Side opening 26 Outer orifice passage 27 passage protrusion 28 side peripheral wall 29 bottom wall 30 inner orifice passage O central axis

Claims (4)

A cylindrical first mounting member coupled to one of the vibration generating unit and the vibration receiving unit, and a second mounting member coupled to the other;
An elastic body that connects the first mounting member and the second mounting member and closes an opening on one side in the axial direction along a central axis of the first mounting member;
A diaphragm member that closes the opening on the other side in the axial direction of the first mounting member;
A partition member that partitions the liquid chamber in the first mounting member into a main liquid chamber having the elastic body as a part of a partition wall and a sub liquid chamber having the diaphragm member as a part of the partition wall;
The diaphragm member includes a deformable diaphragm main body forming a part of a partition wall of the sub liquid chamber, and a ring portion disposed on an outer peripheral side of the diaphragm main body and connected to the first mounting member,
The ring portion is formed with an outer orifice passage that communicates with one of the main liquid chamber and the sub liquid chamber and extends in a circumferential direction around the central axis,
The partition member protrudes toward the auxiliary liquid chamber, and is formed with a passage protrusion that is fitted in the ring portion.
An inner orifice that extends in the circumferential direction between the passage protrusion and the inner peripheral surface of the ring portion and communicates the other of the main liquid chamber and the sub liquid chamber with the outer orifice passage. A vibration isolator having a passage formed therein. Of the circumferential end portions of the outer orifice passage, one end portion communicates with one circumferential end portion of the inner orifice passage, and the other end portion communicates with the main liquid chamber,
2. The vibration isolator according to claim 1, wherein an end portion on the other circumferential side of the inner orifice passage communicates with the sub liquid chamber. The passage protrusion is
A side peripheral wall that protrudes from the partition member toward the sub liquid chamber side and extends in the circumferential direction, and whose front and back surfaces face the radial direction;
A bottom wall that protrudes radially outward from the side peripheral wall with the axial gap between the partition member and a tip edge of which contacts the inner peripheral surface of the ring portion; The vibration isolator according to claim 1 or 2, further comprising: The ring portion is formed with a groove portion that opens toward the partition member side and extends in the circumferential direction, and a side opening that communicates the end portion in the circumferential direction of the groove portion with the inside of the diaphragm body. And the outer orifice passage is defined by the side opening being covered by the partition member,
4. The vibration isolation device according to claim 1, wherein an end portion in the circumferential direction of the passage protrusion is located in an end portion in the circumferential direction of the groove portion through the side opening. 5. apparatus.

Images