JP2014139459A - Vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce residue of liquid in a vibration isolator, resulting from part assembly carried out simultaneously with enclosure of liquid.SOLUTION: A liquid drain cutout 34D is formed in an outer periphery of a holding part 34. A clearance R is formed between an outer periphery of an enlarged diameter portion 14C and an inner periphery of an outer peripheral part 34B after swage. The clearance R is communicated with the exterior via the liquid drain cutout 34D.

Description

  The present invention relates to a vibration isolator that is used as an engine mount or the like in a general industrial machine or an automobile and absorbs and attenuates vibration transmitted from a vibration generating unit such as an engine to a vibration receiving unit such as a vehicle body.

  Conventionally, an anti-vibration device as an engine mount is disposed between an engine that is a vibration generation unit of a vehicle and a vehicle body that is a vibration receiving unit, and this anti-vibration device absorbs vibration generated by the engine. Suppresses vibration transmission to the vehicle body. As such a vibration isolator, an elastic body and a pair of liquid chambers (a main liquid chamber and a sub liquid chamber) are provided inside the apparatus, and a pair of liquid chambers communicate with each other through a restriction passage. It has been known. According to this liquid-filled vibration isolator, when vibration is generated due to the operation of the mounted engine, the vibration damping function of the elastic body and the liquid in the restriction passage communicating between the pair of liquid chambers are provided. Absorbs vibration with viscous resistance, etc., and suppresses vibration transmission to the vehicle body.

  The main body of such a vibration isolator forms an elastic body, an outer cylinder having an elastic body bonded to the inner periphery, a partition member for partitioning a pair of liquid chambers, and a sub liquid chamber that is one of a pair of liquid chambers. It is constructed by assembling a plurality of parts such as a rubber film. In order to prevent excessive deformation of the elastic body when a large vibration is input, a stopper fitting is generally attached to the outside of the main body configured by assembling these parts (Patent Documents 1-3). reference). Since rainwater or the like may accumulate between the stopper fitting and the main body, a drain hole may be formed. For example, in Patent Literatures 1-3, an opening for draining is formed in the stopper fitting.

  On the other hand, when assembling the main body in the liquid in order to enclose the liquid in the liquid chamber of the vibration isolator before attaching the stopper bracket, the work of discharging the liquid remaining in the anti-vibration apparatus after assembly Is required.

Patent 4890431 JP 2010-270831 A JP 2010-270827 A

  The present invention has been made in view of the above circumstances, and provides a vibration isolator capable of suppressing liquid stagnation in a vibration isolator that occurs during component assembly performed simultaneously with liquid filling. Objective.

In order to achieve the above object, a vibration isolator according to claim 1 of the present invention includes a first mounting member connected to one of a vibration generating portion and a vibration receiving portion, a cylindrical shape, and the vibration generating portion and the vibration receiving portion. A second attachment member connected to the other of the first attachment member, an elastic body disposed between the first attachment member and the second attachment member, and connecting the two together, and the elastic body as a part of the partition wall. A main liquid chamber, which is configured inside the mounting member, encloses a liquid, and encloses the liquid, communicates with the main liquid chamber via a restriction passage, and at least a part of the partition wall is formed by a diaphragm and can be expanded and contracted. One of the annular outer peripheral bracket, the annular outer peripheral bracket to which the outer peripheral end of the diaphragm is bonded, and the second mounting member and the annular outer peripheral bracket are attached to the vehicle body and the tip is on the lower side. Caulking that is placed and caulked from outside in the radial direction And,
A notch formed at the tip of one of the second mounting member and the annular outer peripheral fitting and communicating with a gap formed between the second mounting member of the caulking portion and the annular outer peripheral fitting, I have.

  When assembling the vibration isolator having the above configuration, the second mounting member and the annular outer peripheral metal fitting are caulked in the liquid to be sealed to form a caulking portion. At this time, the liquid enters a gap formed between the second mounting member that forms the crimped portion and the annular outer peripheral metal fitting. In the present invention, since the notch portion communicating with the gap is formed at one end of the second mounting member and the annular outer peripheral metal member arranged on the radially outer side, the liquid can be discharged from the notch portion. Therefore, the liquid can be discharged from the gap formed by the caulking performed simultaneously with the liquid filling, and the retention of the liquid in the vibration isolator can be suppressed.

  In addition, since a notch is formed at the tip disposed on the lower side in the state of being attached to the vehicle body, rainwater or the like from the upper side is formed between the second mounting member and the annular outer peripheral bracket via the notch. Can be prevented from entering the gap.

  The vibration isolator according to claim 2 of the present invention is characterized in that a plurality of the notch portions are formed at equal intervals on the outer periphery of the caulking portion.

  According to the above configuration, air can be blown from one notch to the gap formed between the second mounting member and the annular outer peripheral metal, and the liquid can be discharged from the other notch.

  The vibration isolator according to claim 3 of the present invention is characterized in that the cutout portion is formed on the tip end side with respect to a maximum outer diameter position of the caulking portion.

  According to the above configuration, since the cutout portion is formed on the lower side in the state of being attached to the vehicle body from the position of the maximum outer diameter, rainwater or the like from the upper side passes through the cutout portion and the second mounting member and the annular outer peripheral bracket Intrusion into the gap formed between the two can be further suppressed.

  As described above, according to the present invention, it is possible to suppress the stagnation of the liquid in the vibration isolator that occurs during the component assembly performed simultaneously with the liquid filling.

It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is side surface sectional drawing which shows the structure before the assembly of the vibration isolator which concerns on embodiment of this invention. It is a perspective view of the partition member of the vibration isolator which concerns on embodiment of this invention. It is an external appearance perspective view of the vibration isolator which concerns on embodiment of this invention. It is a perspective view which shows the subliquid chamber side assembly of this embodiment.

  Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a vibration isolator 10 according to an embodiment of the present invention. The vibration isolator 10 is applied as an engine mount that supports an engine that is a vibration generating unit in an automobile to a vehicle body that is a vibration receiving unit. In addition, the code | symbol S in a figure shows the axial center of an apparatus, and let the direction along this axial center be the axial direction S of an apparatus. In addition, the vertical direction in the figure is the vertical direction of the vibration isolator 10 in a state where it is attached to the vehicle body. Main vibration (main vibration) for the purpose of vibration isolation is input in the axial direction S.

  As shown in FIG. 1, the vibration isolator 10 includes a first attachment member 12 and a second attachment member 14.

  The second attachment member 14 has a cylindrical shape, and has an enlarged diameter portion 14C on the upper end side. The enlarged diameter portion 14C has a larger diameter than other portions of the second mounting member 14 (hereinafter referred to as “cylindrical portion 14A”). Between the expanded diameter portion 14C and the cylindrical portion 14A, a stepped portion 14B is formed that extends radially outward. The second mounting member 14 is connected to the vehicle body via a bracket (not shown).

  The first attachment member 12 includes an attachment portion 12 </ b> A and a cup portion 12 </ b> B that are smaller in diameter than the second attachment member 14. The attachment portion 12A has a cylindrical shape, and a female screw 12N is formed on the inner surface of the cylinder. A bolt (not shown) connected to the engine side is screwed into the female screw 12N to connect the engine. The cup portion 12B is in the shape of a bottomed cylinder with a diameter increasing upward, and is fixedly arranged at the upper end of the attachment portion 12A so as to be coaxial with the attachment portion 12A. The first mounting member 12 is disposed inside the second mounting member 14 so as to be coaxial with the second mounting member 14. A part of the lower end of the attachment portion 12 </ b> A protrudes downward from the lower end of the second attachment member 14. The axial centers of the first mounting member 12 and the second mounting member 14 coincide with the axial direction S of the vibration isolator 10.

  Between the first mounting member 12 and the second mounting member 14, a rubber elastic body 16 serving as a vibration absorbing main body is disposed. The elastic body 16 is vulcanized and bonded to the outer surface of the first mounting member 12, and is vulcanized and bonded to the lower side of the cylindrical portion 14A of the second mounting member 14, and the first mounting member 12 and the second mounting member. 14 is connected elastically.

  A thin film-shaped covering portion 16 </ b> A extending upward is integrally formed with the elastic body 16 from the upper end portion of the elastic body 16 along the second mounting member 14. The covering portion 16A is vulcanized and bonded to the inner peripheral surface of the cylindrical portion 14A to cover the inner wall of the cylindrical portion 14A. In addition, a thin rubber portion 16B is integrally formed with the elastic body 16 so as to cover the inner surface on the inner side of the cup portion 12B.

  A partition member 20 is disposed on the radially inner side of the enlarged diameter portion 14 </ b> C of the second mounting member 14. The partition member 20 has a substantially disc shape as a whole (see FIG. 3), and partitions between a main liquid chamber 40 and a sub liquid chamber 42 which will be described later. Details of the partition member 20 will be described later.

  A restriction passage member 30 is disposed on the opposite side of the second attachment member 14 with the partition member 20 in between. The restriction passage member 30 is a separate member from the partition member 20. The restricting passage member 30 is annular and includes a passage portion 32 and a clamping portion 34.

  The passage portion 32 includes an outer peripheral portion 32A disposed on the outer peripheral side, an inner peripheral portion 32C disposed on the inner peripheral side in parallel with the outer peripheral portion 32A, and a connecting portion that connects one end of the outer peripheral portion 32A and the inner peripheral portion 32C. 32B. The cross section of the passage portion 32 is substantially U-shaped, and the U-shaped opening is disposed toward the partition member 20 side. The outer diameter of the passage portion 32 is substantially the same as the outer diameter of the cylindrical portion 14 </ b> A of the second mounting member 14. The lower end of the inner peripheral portion 32C is disposed above the lower end of the outer peripheral portion 32A. The passage portion 32 constitutes a part of a restriction passage 44 described later.

  The clamping part 34 has a larger diameter than the passage part 32 and includes a base part 34A, an outer peripheral part 34B, and a tip part 34C. The base portion 34 </ b> A extends radially outward from the outer tip of the passage portion 32. The outer peripheral portion 34B is bent from the radially outer end of the base portion 34A downward. The distal end portion 34C is bent from the lower end of the outer peripheral portion 34B to the inside in the radial direction. The clamping part 34 is arrange | positioned on the outer side of the enlarged diameter part 14C of the 2nd attachment member 14, and is crimped by the axial direction S, and comprises the crimping part of this invention.

  As shown in FIG. 4, a liquid drain notch 34 </ b> D is formed at two opposing positions on the outer periphery of the holding part 34. The drainage cutout 34D is formed by cutting out the outer edge from the distal end portion 34C to the outer peripheral portion 34B. The upper end of the drainage cutout 34D is formed below the maximum outer diameter position of the clamping part 34 (on the tip part 34C side).

  On the radially inner side of the passage portion 32, an elastic membrane diaphragm 50 is vulcanized and bonded so as to cover the opening. The diaphragm 50 has a bowl-like shape with a downward opening that protrudes upward in the axial direction S from the passage portion 32. A thick support rubber portion 33 is formed integrally with the diaphragm 50 on the radially inner side of the U-shape of the passage portion 32. On the lower side of the inner periphery of the support rubber portion 33, a press-fitting position determining portion 33A having an inner diameter enlarged to form a step is formed. A storage portion 22B of the second partition plate 22 described later is press-fitted into the press-fitting position determining portion 33A. The accommodating portion 22B is press-fitted so that one end corner portion 22E described later is fitted into the press-fitting position determining portion 33A. The step height in the axial direction S of the press-fitting position determining portion 33A is lower than the height of the storage portion 22B of the second partition plate 22 described later.

A passage covering rubber 31 is formed in the passage portion 32 so as to cover the U-shaped inner peripheral surface. The passage covering rubber 31 is formed integrally with the diaphragm 50 and the support rubber portion 33.

  As shown in FIG. 2, a covering rubber portion 36 and a seal portion 35 are formed on the lower surface of the base portion 34 </ b> A of the clamping portion 34. The covering rubber portion 36 is formed continuously from the passage covering rubber 31 and covers the radially inner lower surface of the base portion 34A. The seal portion 35 includes a main seal portion 35A and a sub lip portion 35B. The sub lip portion 35B is formed continuously from the covering rubber portion 36 and is formed radially outward from a position facing the cylindrical portion 14A of the second mounting member 14 in the axial direction S. The sub lip portion 35B is thicker than the covering rubber portion 36, and a step is formed between the covering rubber portion 36 and the sub lip portion 35B.

  The main seal portion 35A is continuously formed radially outward from the sub lip portion 35B. The length in the axial direction S before assembly of the main seal portion 35A is longer than the length in the axial direction S of the enlarged diameter portion 14C of the second mounting member. The radially inner side of the main seal portion 35A has a tapered shape in which the upper inner diameter is reduced. The main seal portion 35 </ b> A is fitted on the radially inner side of the enlarged diameter portion 14 </ b> C of the second attachment member 14.

  A partition member 20 is disposed between the restriction passage member 30 and the second attachment member 14. A main liquid chamber 40 is formed on the inner side surrounded by the upper surface of the elastic body 16 and the lower surface of the partition member 20. The main liquid chamber 40 has an annular portion 40A along the inner periphery of the second mounting member 14 and a central portion 40B formed in the cup portion 12B. A liquid is sealed in the main liquid chamber 40. As the liquid, water, oil, ethylene glycol or the like can be used.

  A sub liquid chamber 42 is formed on the inner side surrounded by the diaphragm 50 and the upper surface of the partition member 20. Similarly to the main liquid chamber 40, liquid is sealed in the sub liquid chamber 42.

As shown in FIG. 3, the partition member 20 includes a first partition plate 22 and a second partition plate 24. The 2nd partition plate 24 is made into disk shape, and is made into the taper shape from which an outer peripheral end becomes a small diameter upward (refer FIG. 2). On one surface (lower surface) of the second partition plate 24, an annular annular ridge 24A protruding downward is formed. The strength of the second partition plate 24 is increased by the annular ridge 24A. A second communication port 24 </ b> H is formed on the inner side in the radial direction from the annular protrusion 24 </ b> A of the second partition plate 24. The second communication port 24H is formed at a position corresponding to an intermediate chamber 23 to be described later, and is composed of one opening at the center of the circle and six openings around it. A communication hole 24 </ b> C is formed on the outer side in the radial direction than the second communication port 24 </ b> H of the second partition plate 24. The communication hole 24 </ b> C is a long hole along the outer periphery of the second partition plate 24, and constitutes a communication hole 20 </ b> C together with a communication hole 22 </ b> C of the first partition plate 22 described later. A rubber film 24 </ b> G is bonded to the upper surface of the second partition plate 24.

On the other surface of the second partition plate 24, a convex portion 25 that is convex upward is formed. A plurality (five in this embodiment) of convex portions 25 are formed along the outer periphery of the second partition plate 24. In addition, the convex part 25 is formed so that it may be arrange | positioned radially outside the restriction | limiting channel | path 44 mentioned later. The height of the convex portion 25 is set to be higher than the thickness of the first partition plate 22. The second partition plate 24 is made of a material having a higher coefficient of thermal expansion than the first partition plate 22. The second partition plate 24 can be formed by a method such as casting using a metal material such as an aluminum alloy as a raw material. It is also possible to perform injection molding using a resin material.

The first partition plate 22 has a substantially hat shape, and an annular plate-like flange portion 22A is formed on the outer periphery. The outer diameter of the flange portion 22 </ b> A is substantially the same as the outer diameter of the second partition plate 24. A communication hole 22C is formed in the flange portion 22A. The communication hole 22C is a long hole along the outer periphery of the flange portion 22A and overlaps with the communication hole 24C of the second partition plate 24 to form a communication hole 20C.
On the inner peripheral side of the flange portion 22A, a bottomed cylindrical storage portion 22B that rises upward from the inner peripheral end of the flange portion 22A is formed. One end corner portion 22E is formed between the outer periphery and the upper surface of the storage portion 22B. A first communication port 22H is formed on the upper surface of the storage portion 22B. The first communication port 22H is formed at a position corresponding to an intermediate chamber 23, which will be described later, and includes one opening at the center of the circle and six openings around it. A rubber film 22G is bonded to the lower surface of the upper portion of the storage portion 22B.

A cutout portion 22D is formed at a position corresponding to the convex portion 25 on the outer peripheral edge of the flange portion 22A. The lower surface of the flange portion 22A is in close contact with the outer peripheral upper surface of the second partition plate 24, and the convex portion 25 is engaged with the notch portion 22D. Thus, the storage portion 22B is closed by the second partition plate 24, and the intermediate chamber 23 is formed inside the storage portion 22B. The intermediate chamber 23 communicates with the main liquid chamber 40 via the second communication port 24H, and communicates with the sub liquid chamber 42 via the first communication port 22H. The first partition plate 22 can be formed by a method such as pressing using a steel plate or the like having a strength higher than that of the second partition plate 24 as a material. The first partition plate 22 is formed of a material having a lower coefficient of thermal expansion than the second partition plate 24.

  Note that the engagement between the notch 22D and the protrusion 25 may be such that the joining state of the first partition plate 22 and the second partition plate 24 can be maintained during conveyance in the manufacturing process. Specifically, the convex portion 25 may be simply press-fitted into the cutout portion 22D. When the second partition plate 24 is made of a metal such as an aluminum alloy, the protruding portion 25 may be inserted into the cutout portion 22 </ b> D and the portion protruding from the upper surface of the first partition plate 22 may be crushed. Further, when the second partition plate 24 is made of resin, a portion protruding from the upper surface of the first partition plate 22 may be dissolved and welded to the upper surface of the first partition plate 22.

  A disc-shaped flow control plate 28 is accommodated in the intermediate chamber 23. The thickness of the flow control plate 28 is thinner than the width of the intermediate chamber 23 in the axial direction S, and is movable in the axial direction S within the intermediate chamber 23 in synchronization with the input vibration. A plurality of small protrusions are formed on the entire surface of the flow control plate 28.

  In the partition member 20, the annular ridge 24 </ b> A is inserted into the cylindrical portion 14 </ b> A of the second mounting member 14, and the outer side in the radial direction from the annular ridge 24 </ b> A contacts the stepped portion 14 </ b> B inside the enlarged diameter portion 14 </ b> C of the second mounting member 14. It is touched. A restriction passage member 30 is disposed on the opposite side of the cylindrical portion 14A with the partition member 20 in between. One end corner 22E of the storage part 22B of the partition member 20 is press-fitted into the press-fitting position determining part 33A and positioned. Further, the sub lip portion 35B is in contact with the outer peripheral upper surface of the flange portion 22A. A main seal portion 35A is disposed between the outer peripheral end surfaces of the enlarged diameter portions 14C and 22B of the second mounting member 14. The outer peripheral edge of the partition member 20 and the enlarged diameter portion 14 </ b> C of the second attachment member 14 are surrounded by the clamping portion 34 of the restriction passage member 30 and are crimped in the axial direction S.

  A gap R is formed between the outer periphery of the enlarged diameter portion 14C after crimping and the inner periphery of the outer peripheral portion 34B. The gap R communicates with the outside through a liquid drain notch 34D (see FIG. 4).

Between the passage portion 32 and the flange portion 22A, a restriction passage 44 is formed by being sealed by the main seal portion 35A, the sub lip portion 35B, and the support rubber portion 33. The restriction passage 44 has an L-shaped cross section, and includes a vertical portion 44A extending in the axial direction S and a lateral portion 44B extending in a direction orthogonal to the axial direction. The vertical portion 44A is formed along the passage covering rubber 31, and the horizontal portion 44B is formed in the radial direction across the passage portion 32 along the flange portion 22A. The restriction passage 44 communicates with the auxiliary liquid chamber 42 via an inner communication port 32D in which the inner periphery of the passage portion 32 is cut off at one end. Further, the restriction passage 44 communicates with the main liquid chamber 40 through the communication hole 20 </ b> C of the partition member 20 at the other end.

  Next, the manufacturing method of the vibration isolator 10 of this embodiment is demonstrated.

  First, the main liquid chamber assembly 46 is manufactured by vulcanizing and forming the elastic body 16 and the covering portion 16 </ b> A on the first mounting member 12 and the second mounting member 14. Further, the diaphragm 50, the support rubber portion 33, the passage covering rubber 31, the covering rubber portion 36, and the seal portion 35 (the main seal portion 35A and the sub lip portion 35B) are vulcanized and formed on the restricting passage member 30. An assembly 48 is manufactured. Note that the front end portion 34C of the sandwiching portion 34 is not bent before caulking and is flush with the outer peripheral portion 34B.

  Next, the partition member 20 is manufactured. The distribution control plate 28 is stored in the storage portion 22B, and the first partition plate 22 and the second partition plate 24 are joined. The joining is performed by temporarily fixing the projecting portion 25 of the second partition plate 24 by engaging the notched portion 22D of the first partition plate 22 and crushing the projecting portion 25 protruding from the upper surface of the flange portion 22A. Thereby, the partition member 20 in which the flow control plate 28 is accommodated in the intermediate chamber 23 is completed.

Next, the main liquid chamber side assembly 46, the partition member 20, and the sub liquid chamber side assembly 48 are assembled. The assembling work is performed in a liquid sealed in the vibration isolator 10.

  First, the partition member 20 is disposed on the enlarged diameter portion 14 </ b> C side of the main liquid chamber side assembly 46. At this time, the annular ridge 24A is inserted into the cylindrical portion 14A, and the outer peripheral edge of the partition member 20 is disposed inside the enlarged diameter portion 14C and brought into contact with the stepped portion 14B. Since the annular protrusion 24A functions as a guide, the partition member 20 can be easily positioned with respect to the main liquid chamber side assembly 46.

  Next, the secondary liquid chamber side assembly 48 is disposed so as to cover the partition member 20. At this time, the accommodating portion 22B of the partition member 20 is press-fitted into the press-fitting position determining portion 33A of the support rubber portion 33. Further, the main seal portion 35A is inserted between the inner peripheral surface of the enlarged diameter portion 14C and the outer peripheral end surface of the partition member 20, and the sub lip portion 35B is brought into contact with the outer peripheral upper surface of the flange portion 22A. Further, the outer peripheral portion 34B and the tip end portion 34C of the sandwiching portion 34 are arranged on the outer periphery of the enlarged diameter portion 14C.

Here, the radially inner side of the main seal portion 35A has a tapered shape in which the inner diameter on the lower side is increased, and in correspondence with this, the tapered shape has a smaller diameter in the upward direction on the outer peripheral end of the partition member 20. Has been. Therefore, it is possible to improve the sealing performance with the outer peripheral end of the partition member 20 while suppressing the buckling of the main seal portion 35A.

Then, the distal end portion 34C is bent inward in the radial direction to sandwich the outer peripheral edge of the partition member 20 and the enlarged diameter portion 14C, and crimped in the axial direction S. At this time, since the sub lip portion 35B is formed at a position facing the step portion 14B, the partition member 20 is sandwiched between the step portion 14B and a good sealing property is ensured with the flange portion 22A. can do. Further, the sub lip portion 35B is not formed radially inward from the position facing the cylindrical portion 14A of the second mounting member 14 in the axial direction S. Therefore, the pressing force of the sub lip portion 35B does not act directly on the portion where the second attachment member 14 is not disposed at the opposing position. Therefore, the load to the partition member 20 can be suppressed and deformation of the restriction passage 44 can be suppressed.

  The assembly of the vibration isolator 10 is completed by the above caulking. Thereafter, air is blown into the gap R from one liquid drain notch 34D, and the liquid is discharged from the other liquid drain notch 34D, whereby the vibration isolator 10 is completed.

  Next, operation | movement of the vibration isolator 10 of this embodiment is demonstrated.

  In the vibration isolator 10, when the elastic body 16, which is the main vibration absorber, is elastically deformed by vibration when vibration is input from the engine or the vehicle body side, the vibration is attenuated and absorbed by the elastic body 16.

  Further, in the vibration isolator 10, the internal volume of the main liquid chamber 40 expands and contracts due to the deformation of the elastic body 16, and the liquid is restricted between the main liquid chamber 40 and the sub liquid chamber 42 as the main liquid chamber 40 expands and contracts. It flows mutually through the passage 44. At this time, at the time of input of vibration in a relatively low frequency range, for example, shake vibration, liquid column resonance occurs in which liquid flows in and out between the main liquid chamber 40 and the sub liquid chamber 42 in resonance with the input vibration. At this time, vibration energy is absorbed by the pressure change of the liquid generated in the space in the restriction passage 44, the viscous resistance of the liquid flow, and the like, and therefore, the vibration isolator 10 is particularly sensitive to vibration in a relatively low frequency range such as shake vibration. Can be effectively absorbed by the liquid column resonance between the main liquid chamber 40 and the sub liquid chamber 42.

  Further, the diaphragm 50 is elastically deformed so as to bulge outward when the liquid flows from the main liquid chamber 40 into the sub liquid chamber 42, thereby suppressing an excessive increase in the liquid pressure in the sub liquid chamber 42. Accordingly, it is possible to prevent the liquid from flowing from the main liquid chamber 40 into the sub liquid chamber 42 due to the increase in the liquid pressure in the sub liquid chamber 42.

  On the other hand, when vibrations in a relatively high frequency range, such as idle vibrations, are input from the engine, clogging occurs in the restriction passage 44 and vibrations cannot be absorbed by liquid column resonance. At this time, the flow control plate 28 vibrates in the axial direction S in the intermediate chamber 23 due to vibration in a high frequency range transmitted to the liquid in the main liquid chamber 40. As a result, the first communication port 22H and the second communication port 24H are opened and closed, and an increase in the liquid pressure in the main liquid chamber 40 is suppressed by the flow of the liquid in the main liquid chamber 40. Therefore, even when a relatively high frequency range vibration is input from the engine, an increase in the dynamic spring constant associated with an increase in the liquid pressure of the liquid in the main liquid chamber 40 can be suppressed, so that a high frequency range vibration is also effectively absorbed. can do.

  According to the vibration isolator 10 of the present embodiment, the liquid that has entered the gap R when the vibration isolator 10 is assembled can be easily discharged by blowing air using the pair of liquid drain notches 34D. If it is the liquid drain notch 34D, compared with the case where a hole is formed, an opening area can be enlarged and a liquid can be drained easily.

  In addition, since the drainage notch 34D is formed on the tip 34C disposed on the lower side when attached to the vehicle body, rainwater or the like from the upper side enters the gap R through the drainage notch 34D. Can be suppressed.

  Further, since the drainage notch 34D is formed below the maximum outer diameter position of the clamping part 34 (on the tip end 34C side), rainwater or the like from above enters the gap R via the drainage notch 34D. Infiltration can be suppressed.

  In the present embodiment, the example in which the liquid drain notches 34D are provided at two locations of the holding portion 34 has been described, but may be provided at one location or at three or more locations. When receiving a plurality of places, it is preferable to provide the outer periphery of the holding part 34 at equal intervals.

  Further, in the present embodiment, the clamping portion 34 is disposed outside the enlarged diameter portion 14C and crimped to sandwich the outer peripheral edge of the partition member 20 and the enlarged diameter portion 14C. However, the enlarged diameter portion 14C is disposed outside and added. You can tighten it. In this case, the vertical direction in the vehicle mounting state of the vibration isolator 10 is opposite to that shown in FIG. 1, and the first mounting member 12 is disposed on the top. In this case, a notch portion similar to the liquid drain notch 34D is formed in the enlarged diameter portion 14C.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 1st attachment member 14 2nd attachment member 16 Elastic body 30 Restriction path member (annular outer periphery metal fitting)
34 Clamping part (caulking part)
34D Liquid drain notch (notch)
34C Tip 40 Main liquid chamber 42 Sub liquid chamber 44 Restricted passage 50 Diaphragm

Claims (3)

A first attachment member coupled to one of the vibration generating portion and the vibration receiving portion;
A second mounting member that is cylindrical and connected to the other of the vibration generating portion and the vibration receiving portion;
An elastic body disposed between the first mounting member and the second mounting member and connecting the two;
A main liquid chamber that is configured inside the second mounting member with the elastic body as a part of a partition, and in which a liquid is enclosed;
A sub-liquid chamber in which a liquid is enclosed, communicated with the main liquid chamber via a restriction passage, and at least a part of the partition wall is formed by a diaphragm and can be expanded and contracted;
An annular outer peripheral fitting to which an outer peripheral end of the diaphragm is bonded,
One of the second mounting member and the annular outer peripheral metal fitting is a caulking portion that is disposed on the vehicle body in a state where the tip is disposed on the lower side and is caulked from the outside in the radial direction with respect to the other.
A notch formed at the tip of one of the second mounting member and the annular outer peripheral metal fitting and communicating with a gap formed between the second mounting member of the caulking part and the annular outer peripheral metal fitting,
Anti-vibration device with   The anti-vibration device according to claim 1, wherein a plurality of the notches are formed at equal intervals on an outer periphery of the caulking portion.   3. The vibration isolator according to claim 1, wherein the notch portion is formed on the tip end side with respect to a maximum outer diameter position of the caulking portion.

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