JP4238128B2 - Vibration isolator - Google Patents

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 automobile, and that suppresses vibration transmission from a vibration generating unit such as an engine to suppress vibration transmission to a vibration receiving unit such as a vehicle body. .

  For example, 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 the anti-vibration device absorbs vibration generated by the engine, Suppresses vibration transmission to the vehicle body. As such a vibration isolator, an elastic body, a pressure receiving liquid chamber and a sub liquid chamber are provided inside the apparatus, and a liquid sealed type in which these liquid chambers communicate with each other through a restriction passage is known. According to this liquid-filled vibration isolator, when vibration is generated when the mounted engine is operated, the vibration damping function of the elastic body and the viscosity of the liquid in the orifice communicating between the pair of liquid chambers Absorbs vibration with resistance, etc., and suppresses vibration transmission to the vehicle body.

  As a conventional liquid-filled vibration isolator, for example, there is one as shown in Patent Document 1. In the vibration isolator described in Patent Document 1, a bottom plate and a top plate which are a first mounting member and a second mounting member are provided, and a cylindrical main body rubber which is an elastic body between the bottom plate and the top plate. (Elastic body) is arranged, and the bottom plate and the top plate are elastically connected by the main body rubber. In this vibration isolator, the inside of the main body rubber is a liquid chamber space filled with liquid, and the lower liquid chamber (pressure receiving liquid chamber) and the upper liquid are separated by a partition cylinder fitted into the main body rubber. The pressure receiving liquid chamber and the sub liquid chamber are communicated with each other by an orifice (restriction passage) formed in the partition wall cylinder.

In the vibration isolator of Patent Document 1, the rigidity and shape of the main body rubber are set (optimized) so that vibration having an amplitude along the axial direction connecting the center of the bottom plate and the center of the top plate can be effectively absorbed. ) Therefore, when a large load is input along the radial direction orthogonal to the axial direction, this load cannot be sufficiently absorbed by the main body rubber alone, and the relative displacement along the radial direction between the bottom plate and the top plate (lateral (Sway) becomes excessive. In order to prevent such excessive rolling, in the vibration isolator of Patent Document 1, the bottom plate is extended to the outer peripheral side of the main body rubber, and the stopper portion is bent at a substantially right angle to the outer peripheral portion of the bottom plate toward the top plate side. In addition, a stopper metal fitting formed on the top plate in the shape of a substantially rectangular plate and extending to the outer peripheral side of the main body rubber is connected, and the outer peripheral portion of this stopper metal fitting is provided to bend at a substantially right angle toward the bottom plate side. A block-shaped stopper rubber is vulcanized and bonded to the upright portion and the stopper portion of the bottom plate, and the stopper fitting and the bottom plate are elastically connected by this stopper rubber. Thereby, even when a large load is input along the radial direction to the bottom plate or the top plate, the relative displacement along the radial direction between the bottom plate and the top plate is limited by the stopper rubber within the range of the elastic deformation amount of the stopper rubber, The occurrence of excessive roll is prevented.
Japanese Patent Publication No. 2732666 (FIG. 1)

  However, in the above-described vibration isolator of Patent Document 1, in order to limit excessive relative displacement along the radial direction between the bottom plate and the top plate, the stopper fitting and the bottom plate connected to the top plate are respectively extended to the outer peripheral side of the main body rubber. In addition, the stopper rubber must be disposed between the upright portion provided on the outer peripheral portion of the stopper fitting and the stopper portion provided on the outer peripheral portion of the bottom plate. For this reason, in the vibration isolator having such a structure, since the stopper rubber is provided, there arises a problem that the size (outer diameter) along the radial direction of the apparatus is inevitably increased.

  An object of the present invention is to provide a stopper rubber that limits the relative displacement of the first and second mounting members against the load input along the radial direction without enlarging the apparatus size in consideration of the above facts. The object is to provide an anti-vibration device that can be provided.

In order to achieve the above object, a vibration isolator according to claim 1 of the present invention is connected to one of a vibration generator and a vibration receiver, and includes a first attachment member formed in a cylindrical shape, a vibration generator, A second attachment member connected to the other of the vibration receiving portions and disposed on the inner peripheral side of the first attachment member; and disposed between the first attachment member and the second attachment member; A rubber elastic body in which the first mounting member and the second mounting member are elastically connected, and provided on the inner peripheral side of the first mounting member and filled with liquid, and at least a part of the inner wall is A pressure-receiving liquid chamber formed by the elastic body and arranged in series with the elastic body in the axial direction of the second mounting member, and filled with liquid and capable of expanding and contracting according to a change in liquid pressure The sub-liquid chamber, the restriction passage for communicating the pressure-receiving liquid chamber and the sub-liquid chamber, and the first The first mounting member disposed in the pressure receiving liquid chamber so as to be interposed between the mounting member and the second mounting member, and extending along a radial direction centering on an axis of the second mounting member. And a stopper rubber that restricts relative displacement between the second mounting member and the second mounting member, and the stopper rubber is in close contact with the first mounting member and the second mounting member. .

  In the vibration isolator according to the first aspect, the stopper rubber for restricting the relative displacement between the first mounting member and the second mounting member along the radial direction around the axis of the second mounting member, By being disposed in the pressure receiving liquid chamber so as to be interposed between the first mounting member and the second mounting member, a load along the radial direction is applied to the first mounting member or the second mounting member. When the input and the first and second mounting members are relatively displaced along the radial direction, the stopper rubber is elastically deformed along the radial direction between the first and second mounting members (compression deformation or tensile deformation). However, since the restoring force in the direction opposite to the transition direction is applied to the first and second mounting members, an excessive load along the radial direction is applied to the first mounting member or the second mounting member. Even if added, the maximum amount of relative displacement along the radial direction of the first and second mounting members Together it can be limited to within a range of elastic deformation of Toppagomu, when the vibration in the radial direction is input can effectively damp the input vibration by damping force of the elastic body and stopper rubber.

  In the vibration isolator according to claim 1, the pressure receiving liquid chamber is disposed inside the first mounting member, and a stopper rubber is disposed in the pressure receiving liquid chamber inside the first mounting member and the second mounting member. Since the stopper rubber is disposed on the inner peripheral side of the first mounting member in the radial direction and also disposed on the inner side of the pressure-receiving liquid chamber in the axial direction. The apparatus is provided with a stopper rubber for limiting relative displacement along the radial direction between the first mounting member and the second mounting member without substantially increasing the size along the radial direction and the axial direction of the apparatus. be able to.

  As described above, according to the vibration isolator of the present invention, the stopper that limits the relative displacement of the first and second mounting members against the load input along the radial direction without increasing the device size. Rubber can be provided.

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

  1 and 2 show a vibration isolator according to an embodiment of the present invention. The vibration isolator 10 is used, for example, as an engine mount in an automobile, and supports an engine that is a vibration generating unit on a vehicle body that is a vibration receiving unit. In the figure, symbol S indicates the axial center of the apparatus, the direction along the axial center S is the axial direction of the apparatus (arrow L direction), and the direction orthogonal to the axial center S is the radial direction of the apparatus (arrow The following description will be given as (R direction).

  As shown in FIG. 1, the vibration isolator 10 includes a vibration isolating unit 12 formed in a substantially cylindrical shape and a bracket 14 for connecting the vibration isolating unit 12 to the vehicle body side. A thick cylindrical holder portion 16 is formed on the bracket 14, and a pair of flange portions 18 extending in the radial direction from the lower end portion of the holder portion 16 are integrally formed. Here, the vibration isolating unit 12 is fitted and fixed in the holder portion 16, and mounting holes 20 for connecting the vehicle bodies are respectively drilled along the axial direction at the distal ends of the pair of flange portions 18. When connecting the vibration isolator 10 to the vehicle body side, bolts (not shown) are respectively inserted into the mounting holes 20 of the pair of flange portions 18 and screwed into the bolt holes provided on the vehicle body side. The vibration isolator 10 is fastened and fixed to the vehicle body side.

  As shown in FIG. 2, the vibration isolating unit 12 is provided with a thin cylindrical outer cylinder 22 having both axial ends opened at the outer peripheral portion thereof, and a substantially cylindrical shape at the inner peripheral side of the outer cylinder 22. A shaft member 24 formed in a shape is disposed. A small-diameter portion 26 having a smaller diameter than the lower side is formed at the upper end portion of the outer cylinder 22 through a step portion 25 bent toward the inner peripheral side.

  On the inner peripheral side of the outer cylinder 22, an intermediate cylinder 30 formed in a cylindrical shape as a whole is fitted. The peripheral wall portion of the intermediate cylinder 30 is formed in a substantially U shape whose cross-sectional shape along the radial direction opens toward the outer peripheral side. A taper portion 32 whose inner and outer diameters are reduced downward is formed on the lower side of the intermediate cylinder 30 over the entire circumference, and an orifice between the taper portion 32 and the outer cylinder 22 will be described later. It arrange | positions so that a part of 70 may extend in the circumferential direction. Further, the intermediate cylinder 30 is formed with a cylindrical portion 27 extending in the axial direction from the lower end portion of the tapered portion 32, and the lower end portion of the cylindrical portion 27 is shown by a two-dot chain line in FIG. As shown by a solid line from the cylindrical shape, a caulking portion 28 that can be bent toward the inner peripheral side is formed. The intermediate cylinder 30 is arranged so that the upper end bent to the inner peripheral side and the outer peripheral surface of the cylindrical part 27 are in contact with the inner peripheral surface of the outer cylinder 22 through a thin film rubber film 34.

  Here, the intermediate cylinder 30 and the outer cylinder 22 constitute a first attachment member that is connected to the vehicle body that is a vibration receiving portion via the bracket 14. Further, the outer cylinder 22 is crimped so as to be reduced in diameter from the outer peripheral side in a state in which the intermediate cylinder 30 elastically connected to the shaft member 24 by a main body rubber 88 described later is fitted on the inner peripheral side thereof. The intermediate cylinder 30 is fixed.

  An attachment fitting 36 having a substantially T-shaped cross-sectional shape is coaxially fixed to the upper end portion of the shaft member 24. The mounting bracket 36 has a disk-shaped top plate portion 38 formed on the upper end side thereof, and a columnar rod portion 40 that protrudes along the axial direction from the center of the bottom surface of the top plate portion 38. Yes. In addition, a rubber diaphragm 42 formed in a thin cylindrical shape is disposed between the lower surface portion of the top plate portion 38 and the small diameter portion 26 of the outer cylinder 22 in the vibration isolation unit 12. The upper end side is vulcanized and bonded to the lower surface portion of the top plate portion 38, and the lower end portion thereof is vulcanized and bonded to the vicinity of the boundary portion between the small diameter portion 26 and the step portion 25 of the outer cylinder 22. Here, the shaft member 24 and the mounting bracket 36 constitute a second mounting member that is connected to the engine, which is a vibration receiving portion, via the top plate portion 38.

  The diaphragm 42 is formed integrally with a rubber film 34 that extends from the lower end of the diaphragm 42 and covers the inner peripheral surface of the outer cylinder 22. The diaphragm 42 is integrally formed with a covering rubber 44 that extends from the upper end to the inner peripheral side and the outer peripheral side and covers the lower surface portion of the top plate portion 38. A fitting projection 46 that is bent downward along the axial direction is formed at the inner peripheral end of the covering rubber 44.

  A bolt shaft 50 and a rotation pin 52 are fixed to the upper surface portion of the top plate portion 38 of the mounting bracket 36 so as to protrude upward. The vibration isolator unit 12 has the top plate portion 38 connected to the engine side via the bolt shaft 50, and the stop pin 52 is fitted into a stop hole provided on the engine side. Positioning relative to the engine is performed, and movement (rotation) of the engine around the bolt shaft 50 is prevented.

  Bolt holes 54 are formed in the rod portion 40 of the mounting bracket 36 along the axial direction from the front end surface. On the other hand, the shaft member 24 has a connecting hole 56 formed in the axial direction from the upper end surface thereof, and a fitting groove 58 is formed in an annular shape on the outer peripheral side of the connecting hole 56 on the upper end surface. The mounting bracket 36 is coupled to the shaft member 24 in a state where the rod portion 40 is fitted into the coupling hole 56 and the vicinity of the peripheral portion of the rod portion 40 in the top plate portion 38 is in contact with the upper end surface of the shaft member 24. ing. At this time, the top plate portion 38 abuts the lower surface portion of the top plate portion 38 on the shaft member 24 via the covering rubber 44, and also fits the fitting protrusion 46 of the covering rubber 44 into the fitting groove 58 of the shaft member 24. . Accordingly, when the shaft member 24 and the mounting bracket 36 are fastened by the connecting bolt 86 described later, the covering rubber 44 and the fitting protrusion 46 function as a spring washer and are compressed in the axial direction, so that the shaft member 24 and the mounting bracket 36 are compressed. Are securely connected.

  In the shaft member 24, the lower end portion is formed in a thin cylindrical shape opening downward, and the inside of the lower end portion is a hollow chamber 60. A circular concave counterbore 62 is formed at the center of the top surface of the hollow chamber 60. The shaft member 24 is provided with a through hole 64 extending along the axis S between the top surface of the spot facing portion 62 and the bottom surface of the connection hole 56. The head of the connecting bolt 86 is inserted into the counterbore 62, the shaft is inserted into the through hole 64 from the hollow chamber 60 side of the shaft member 24, and the tip of the shaft is attached to the mounting bracket 36. The shaft member 24 and the mounting bracket 36 are fastened and fixed by being screwed into the bolt holes 54. Further, a hexagonal hole 87 into which a hexagonal wrench (not shown) can be inserted is opened at the head of the connecting bolt 86.

  The vibration isolation unit 12 is provided with a main rubber 66 molded with the shaft member 24 and the intermediate cylinder 30 as insert cores. The main body rubber 66 is formed in a ring shape so that the thickness on the inner peripheral side is thin as a whole and the thickness is gradually increased toward the outer peripheral side, and the upper portion and the intermediate cylinder on the outer peripheral surface of the shaft member 24 are formed. 30 is vulcanized and bonded to the upper part of the inner peripheral surface. Thereby, the shaft member 24 is elastically connected to the outer cylinder 22 via the main body rubber 66 and the intermediate cylinder 30. Further, an outer peripheral rubber layer 68 is integrally formed on the main body rubber 66 so as to fill a substantially cylindrical space formed between the outer peripheral surface of the intermediate cylinder 30 and the inner peripheral surface of the outer cylinder 22. . The outer peripheral rubber layer 68 is vulcanized and bonded to the outer peripheral surface of the intermediate cylinder 30, and the outer peripheral surface is pressed against the inner peripheral surface of the outer cylinder 22 via the rubber film 34. Here, the main rubber 66 is molded from NR (natural rubber).

  A circumferential portion 72 of the orifice 70 is formed in the outer peripheral rubber layer 68 at a portion on the outer peripheral side of the tapered portion 32 in the intermediate cylinder 30. The circular portion 72 is formed in a groove shape so as to open on the outer peripheral surface of the outer peripheral rubber layer 68, and extends in the circumferential direction about the axis S. The orifice 70 is formed with a communicating portion 74 that extends upward from one end of the circumferential portion 72, and the communicating portion 74 is also formed in a groove shape so as to open to the outer peripheral surface of the outer peripheral rubber layer 68. Yes. The peripheral portion 72 and the communication portion 74 are closed by a rubber film 34 whose outer peripheral side covers the inner peripheral surface of the outer cylinder 22 to form an elongated space (orifice space).

  The anti-vibration unit 12 is provided with a disk-shaped lid member 76 that closes the lower end side of the intermediate cylinder 30. Thereby, a space sealed from the outside is formed between the main body rubber 66 and the lid member 76 in the intermediate cylinder 30, and the space in the intermediate cylinder 22 is a liquid such as water, ethylene glycol, or silicon oil. The pressure receiving liquid chamber 78 is filled. Further, in the vibration isolation unit 12, a space that is sealed from the outside by the main body rubber 66 and the diaphragm 42 is formed on the outer peripheral side of the shaft member 24 on the outer cylinder 22, and the space above the outer cylinder 22 is The auxiliary liquid chamber 80 is filled with a liquid such as water, ethylene glycol, or silicon oil. Here, as shown in FIG. 2, the lid member 76 is fitted and inserted into the cylindrical portion 27 so as to come into contact with the lower surface portion of the tapered portion 32 from the lower end side of the intermediate cylinder 30, and then the caulked portion 28 is a solid line. As shown in FIG. 4, the intermediate cylinder 30 is fixed by caulking to the inner peripheral side.

  On the other hand, a connecting hole 82 that penetrates the outer peripheral rubber layer 68 and the intermediate cylinder 30 and is connected to the pressure receiving liquid chamber 78 is formed at the other end of the circumferential portion 72 of the orifice 70. A connection hole 84 that penetrates the intermediate cylinder 30 and the main body rubber 66 and is connected to the inside of the pressure receiving liquid chamber 78 is formed at the upper end portion of 74. Thereby, the pressure receiving liquid chamber 78 and the sub liquid chamber 80 are connected so that the liquid can flow through the orifice 70.

  A stopper rubber 94 is inserted into the pressure receiving liquid chamber 78 in the vibration isolation unit 12. As shown in FIG. 3, the stopper rubber 94 is formed in a substantially cross shape when viewed from the outside in the axial direction, and is formed so that a circular holder hole 96 penetrates in the axial direction at the center thereof. Yes. The stopper rubber 94 is provided with four arm portions 98 extending in the radial direction around the axis S at intervals of 90 ° along the circumferential direction. Here, the dimension between the tips of the two arm portions 98 linearly arranged along the radial direction is set to a length corresponding to the inner diameter on the lower side of the tapered portion 32 in the intermediate cylinder 30; The outer peripheral end surface of the arm portion 98 has a shape corresponding to the shape on the lower side of the tapered portion 32.

  The stopper rubber 94 configured as described above is inserted into the pressure receiving liquid chamber 78 from the lower end side of the outer cylinder 22, and the shaft member 24 and the intermediate cylinder 30 are separated in the pressure receiving liquid chamber 78 as shown in FIG. 2. Intervened in between. At this time, the stopper rubber 94 in the stopper member 90 is press-fitted to the lower side of the tapered portion 32 in the intermediate cylinder 30 and the outer peripheral surface thereof is fixed to the inner peripheral surface of the tapered portion 32 with an adhesive or the like. At this time, the shaft member 24 is inserted so as to be slidable along the axial direction with its outer peripheral surface abutting into the holder hole 96, and between the tip of the shaft member 24 and the lid member 76. A clearance longer than the maximum value of the amplitude of the input vibration along the axial direction is formed.

  Here, the stopper rubber 94 of the stopper member 90 is formed of a rubber material having a higher damping ability than the NR on which the main body rubber 66 is formed, for example, butyl NR, butyl rubber, EPDM (ethylene propylene rubber), or the like.

  Next, the operation of the vibration isolator 10 according to the present embodiment configured as described above will be described. In the vibration isolator 10, when the engine connected to the top plate portion 38 of the vibration isolation unit 12 operates, vibration from the engine is transmitted to the main rubber 66 via the top plate portion 38 and the shaft member 24. At this time, the main rubber 66 acts as a vibration absorber, and the input vibration is absorbed by the internal friction accompanying the deformation of the main rubber 66. At the same time, when the internal volume of the pressure receiving liquid chamber 78 expands or contracts due to the deformation of the main rubber 66, the liquid passes through the orifice 70 between the pressure receiving liquid chamber 78 and the sub liquid chamber 80 as the liquid pressure in the pressure receiving liquid chamber 78 changes. Circulate with each other. At this time, in the secondary liquid chamber 80, the diaphragm 42 is elastically deformed and the internal volume changes in accordance with the change in the internal liquid pressure, so that the liquid flows into and out of the secondary liquid chamber 80 smoothly.

  The auxiliary liquid chamber 80 is formed so that a part of its inner wall is formed by the main rubber 66 and is adjacent to the pressure receiving liquid chamber 78 via the main rubber 66 along the axial direction. Accordingly, when the vibration is input, the internal volume of the sub liquid chamber 80 is expanded when the internal volume of the pressure receiving liquid chamber 78 is reduced, and the internal volume of the sub liquid chamber 80 is reduced when the internal volume of the pressure receiving liquid chamber 78 is expanded. Since the pressure fluctuations between the pressure receiving liquid chamber 78 and the sub liquid chamber 80 are in an opposite phase relationship, the liquid flow between the pressure receiving liquid chamber 78 and the sub liquid chamber 80 can be effectively promoted.

  In the vibration isolator 10, the liquid flows between the pressure receiving liquid chamber 78 and the sub liquid chamber 80 through the orifice 70 when vibration is input as described above, whereby the pressure change of the liquid generated in the orifice 70, the liquid flow Vibration can be absorbed by the viscous resistance of the liquid, and a resonance phenomenon (liquid column resonance) occurs in the liquid flowing between the pressure receiving liquid chamber 78 and the sub liquid chamber 80 when vibration of a specific frequency (for example, shake vibration) is input. The input column vibration can be more effectively attenuated and absorbed by the action of the liquid column resonance.

  In the vibration isolator 10 according to the present embodiment, the stopper rubber 94 is interposed between the intermediate cylinder 30 that forms part of the first mounting member and the shaft member 24 that forms part of the first mounting member. By being disposed in the pressure receiving liquid chamber 78 as described above, relative displacement along the radial direction between the intermediate cylinder 30 and the shaft member 24 by the stopper rubber 94, that is, the outer cylinder 22 to which the intermediate cylinder 30 is attached, The relative displacement along the radial direction with respect to the mounting bracket 36 to which the shaft member 24 is connected is limited. That is, when a load along the radial direction is input to the outer cylinder 22 or the mounting bracket 36 and the outer cylinder 22 and the mounting bracket 36 are relatively displaced along the radial direction, the stopper rubber 94 is moved between the intermediate cylinder 30 and the shaft member 24. A restoring force in the direction opposite to the transition direction is applied to the outer cylinder 22 and the mounting bracket 36 while elastically deforming (compressive deformation or tensile deformation) along the radial direction between the outer cylinder 22 and the mounting bracket 36. Even when an excessive load is applied along the radial direction, the maximum amount of relative displacement along the radial direction of the outer cylinder 22 and the mounting bracket 36 can be limited within the range of the elastic deformation amount of the stopper rubber 94. At this time, in the vibration isolator 10, when vibration along the radial direction is inputted, in addition to the damping force of the main rubber 66, the damping of the stopper rubber 94 that can generate a high damping force against the input vibration. Since the force acts, the vibration along the radial direction can be effectively damped and absorbed, and the main body rubber 66 is molded using NR as a material for the input vibration along the axial direction (vertical direction). As a result, the spring constant can be kept sufficiently low, so that the input vibration along the vertical direction can be effectively absorbed.

  Here, since the stopper rubber 94 is made of a rubber material such as butyl NR, butyl rubber, EPDM or the like having a higher damping capacity than the rubber material (NR) from which the main body rubber 66 is formed, along the axial direction. Even if the load input along the radial direction is considerably larger than the vibration input to the outer cylinder 22 or the mounting bracket 36, the rolling on the mounting bracket 36 side caused by the load along the radial direction can be attenuated in a short time. . In addition, the maximum amount of relative displacement along the radial direction of the outer cylinder 22 and the mounting bracket 36 is desired by appropriately adjusting the rigidity along the radial direction of the stopper rubber 94 according to the maximum load input along the radial direction. It becomes possible to set to the value of.

  Further, in the vibration isolator 10 according to the present embodiment, the pressure receiving liquid chamber 78 is disposed inside the outer cylinder 22 constituting a part of the first mounting member, and a stopper rubber 94 is provided inside the pressure receiving liquid chamber 78. Since the stopper rubber 94 is disposed so as to be interposed between the intermediate cylinder 30 and the shaft member 24, the stopper rubber 94 is disposed on the inner peripheral side of the outer cylinder 22 in the radial direction. In addition, since it is disposed inside the pressure-receiving liquid chamber 78 in the axial direction, the outer cylinder 22 and the mounting bracket 36 can be mounted without substantially increasing the size along the radial direction and the axial direction of the vibration isolation unit 12. A stopper rubber 94 that restricts relative displacement along the radial direction can be provided in the vibration isolation unit 12.

  In the vibration isolator 10 according to the present embodiment, only one sub liquid chamber 80 is provided, and the pressure receiving liquid chamber 78 and the sub liquid chamber 80 are communicated with one orifice 70. For example, two sub liquid chambers may be provided, and the plurality of sub liquid chambers may be communicated with the pressure receiving liquid chamber by a plurality of orifices having different path lengths and cross-sectional areas, respectively. In the vibration isolator 10 according to the present embodiment, the outer cylinder 22 is connected to the vehicle body side, and the mounting bracket 36 disposed on the inner peripheral side of the outer cylinder 22 is connected to the engine side. Conversely, the outer cylinder 22 may be connected to the engine side, and the mounting bracket 36 may be connected to the vehicle body side.

  In addition, when the input direction of the input vibration along the radial direction to the vibration isolator 10 is limited to substantially one direction, as shown in FIG. The I-shaped stopper rubber 110 provided in a fixed manner is inserted into the pressure-receiving liquid chamber 78, and the arm portion 98 of the stopper rubber 110 extends in parallel with the input direction of the input vibration along the radial direction. You may make it arrange | position. Thereby, in the vibration isolator 10, the input vibration along the radial direction in which the input direction is limited to approximately one direction can be effectively attenuated.

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 of a vibration isolator unit as FIG. 1 shows. It is a perspective view which shows the structure of the stopper member arrange | positioned in the pressure receiving liquid chamber of the vibration isolator unit shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Anti-vibration apparatus 12 Anti-vibration unit 14 Bracket 22 Outer cylinder (1st attachment member)
24 Shaft member (second mounting member)
30 Intermediate cylinder (first mounting member)
36 Mounting bracket (second mounting member)
38 Top plate part 40 Rod part 42 Diaphragm 66 Body rubber (elastic body)
68 Outer peripheral rubber layer (elastic body)
70 Orifice 72 Circumferential portion 74 Communication portion 76 Cover member 78 Pressure receiving liquid chamber 80 Sub liquid chamber 82, 84 Connection hole (orifice)
94 Stopper rubber

Claims (3)

A first mounting member connected to one of the vibration generating portion and the vibration receiving portion and formed in a cylindrical shape;
A second mounting member connected to the other of the vibration generating unit and the vibration receiving unit and disposed on the inner peripheral side of the first mounting member;
A rubber elastic body that is disposed between the first mounting member and the second mounting member and elastically connects the first mounting member and the second mounting member;
Provided on the inner peripheral side of the first mounting member and filled with liquid, at least part of the inner wall is formed by the elastic body, and is arranged in series with the elastic body in the axial direction of the second mounting member A pressurized pressure chamber,
A sub liquid chamber that is filled with liquid and whose internal volume can be expanded and contracted according to a change in liquid pressure;
A restriction passage that allows the pressure-receiving liquid chamber and the sub-liquid chamber to communicate with each other;
The first mounting member is disposed in the pressure receiving liquid chamber so as to be interposed between the first mounting member and the second mounting member, and the first mounting member extends along a radial direction centering on an axis of the second mounting member. A stopper rubber for restricting relative displacement between the first mounting member and the second mounting member;
Have
The vibration isolator, wherein the stopper rubber is in close contact with the first mounting member and the second mounting member.   The vibration isolator according to claim 1, wherein the stopper rubber is made of a rubber material having a higher damping capacity than the rubber material on which the elastic body is formed. 2. The pressure receiving liquid chamber and the sub liquid chamber are partitioned so that the elastic body serves as a partition, and are arranged adjacent to each other along the axial direction of the first mounting member. 2. The vibration isolator according to 2.

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