JP7102234B2 - Vibration isolation device - Google Patents

Description

The present invention relates to a vibration isolation device applied to, for example, an engine mount of an automobile.

Conventionally, there has been known a vibration-proof device that is interposed between a power unit of an automobile and a member that constitutes a vibration transmission system such as a vehicle body, and vibration-proof connection or vibration-proof support between the members. In such a vibration isolator, for example, as described in Japanese Patent Application Laid-Open No. 2010-78079 (Patent Document 1), an inner member to which a power unit is attached and an outer member to which a vehicle body is attached are made of a rubber elastic body. It has a connected structure to insulate and dampen vibrations from the power unit to the vehicle body.

By the way, in the vibration isolator, the supporting load and the vibration load may be applied in a plurality of directions, and different spring characteristics and vibration isolating characteristics may be required in each of these directions. For example, in an automobile engine mount, a soft spring characteristic may be required in the vehicle front-rear direction while ensuring a support spring characteristic in the vehicle vertical direction.

However, in the vibration isolator having the conventional structure shown in Patent Document 1, generally, the inner member, the outer member, and the rubber elastic body of the main body connecting them have a rotationally symmetric shape around the central axis, and thus have spring characteristics. The degree of freedom of tuning was small, and it was sometimes difficult to fully achieve the required characteristics. In the anti-vibration device described in Patent Document 1, for example, the thickness of the rubber elastic body of the main body is made different in the circumferential direction so that the portion located in the front-rear direction of the vehicle is thinner than the portion located in the left-right direction of the vehicle. By doing so, it is conceivable to set the spring characteristics in the vehicle front-rear direction softer than in the vehicle left-right direction. However, if the body rubber elastic body having a rotationally symmetric shape around the central axis is only partially thinned, the load input mode is the same for the thick part and the thin part. There is a problem that deformation is likely to occur intensively and it is difficult to secure the strength of the supporting spring as a whole.

Japanese Unexamined Patent Publication No. 2010-78079

Here, the present invention has been made against the background of the above-mentioned circumstances, and the problem to be solved is that the degree of freedom in tuning the spring characteristics is increased, and for example, the support spring characteristics in the axial direction are secured. It is an object of the present invention to provide a vibration isolator having a novel structure, which makes it possible to set a large spring ratio in two directions perpendicular to the axes orthogonal to each other.

The first aspect of the present invention is a vibration isolator in which an inner member and a tubular outer member are connected by a rubber elastic body of the main body, and the inner member and the outer member face each other in the axial direction. The facing portion and the non-opposing portion that deviates from each other in the direction perpendicular to the axis and does not face each other in the axial direction are partially provided in the circumferential direction, and the rubber elastic body of the main body has the inner member in the facing portion. A compression rubber portion that is compressively deformed by the axial relative displacement of the outer member and a shear rubber portion that is sheared and deformed by the axial relative displacement of the inner member and the outer member at the non-opposing portion are provided. On the other hand, neither the compressed rubber portion nor the sheared rubber portion of the main body rubber elastic body directly connects the facing surfaces of the inner member and the outer member in the direction perpendicular to the axis. It is characterized in that it is sheared and deformed when the inner member and the outer member are displaced relative to each other in the direction perpendicular to the axis.
A second aspect of the present invention is that in the vibration isolator according to the first aspect, the outer member is tubular and one opening portion is provided with a small diameter portion extending toward the inner circumference. The inner member is provided with a protrusion in the direction perpendicular to the axis whose protrusion dimension in the direction perpendicular to the axis is different in the circumferential direction, and the protrusion in the direction perpendicular to the axis is arranged inside the outer member in a housed state. The small diameter portion is connected by the rubber elastic body of the main body.
A third aspect of the present invention is the vibration isolator according to the first or second aspect, wherein the wall portion is formed of the rubber elastic body of the main body and the vibration is input, and the wall is formed of a pressure receiving chamber and a flexible film. An equilibrium chamber is provided, and the pressure receiving chamber and the equilibrium chamber are communicated with each other by an orifice passage to form a fluid-filled anti-vibration device, and the inner member is provided in a direction perpendicular to the axis. An axially perpendicular projecting portion having different protrusion dimensions in the circumferential direction is provided, and the main body rubber elastic body having the compressed rubber portion and the sheared rubber portion is one of the axially perpendicular projecting portions. The inner member is elastically connected to the outer member so as to be provided toward the side, and the pressure receiving chamber and the equilibrium chamber are on the other side in the axial direction with respect to the axially perpendicular protrusion of the inner member. A fluid chamber having the above is formed.

According to the anti-vibration device having a structure according to the first to third aspects of the present invention, the load input mode to the main body rubber elastic body is different in the circumferential direction, and the compressed rubber portion is different with respect to the axial input. While it is possible to obtain a large support spring strength, it is also possible to set a large spring ratio between the compressed rubber portion and the shear rubber portion for the input in the direction perpendicular to the axis. Further, since the shear deformation is dominated by the deformation of the sheared rubber portion at the time of axial input, a large stress concentration can be avoided even if the non-compressed rubber portion has a low spring. As described above, according to the present invention, the compression rubber portion and the shear rubber portion share the functions with respect to the input in the axial direction and the directions perpendicular to each axis, and the spring characteristics in the axial direction and the directions perpendicular to each axis are exhibited. The degree of freedom of tuning can be improved and facilitated.

A fourth aspect of the present invention is the vibration isolator according to any one of the first to third aspects, wherein the facing portions of the inner member and the outer member face each other in a direction perpendicular to the axis. A pair of the non-opposing portions are provided at positions facing each other in the direction orthogonal to the axis perpendicular to the axis perpendicular direction in which the pair of facing portions are located.

According to the anti-vibration device having a structure according to this embodiment, the compressed rubber portion and the sheared rubber portion can be arranged substantially evenly in the circumferential direction, and the main body rubber elastic body including the compressed rubber portion and the sheared rubber portion can be arranged. The overall deformation mode can be stabilized. In addition, it is easy to set a large spring ratio in two directions perpendicular to the axis by making the spring characteristics different from each other in the direction perpendicular to the axis where the compressed rubber portion faces and the direction perpendicular to the axis where the shear rubber portion faces. ..

A fifth aspect of the present invention is that in the vibration isolator according to any one of the first to fourth aspects, one opening portion of the outer member is provided with a small diameter portion extending toward the inner circumference. On the other hand, the inner member is provided with a protrusion in the direction perpendicular to the axis whose protrusion dimension in the direction perpendicular to the axis is different in the circumferential direction, and the portion having a large protrusion in the direction perpendicular to the axis is the outer member. By being positioned so as to face the small diameter portion in the axial direction, the facing portion in the axial direction between the inner member and the outer member is configured.

According to the anti-vibration device having a structure according to this embodiment, the inner member has a different shape from the circular shape in a plan view, so that the opposed portion and the non-opposed portion can be realized with a simple structure. Further, the spring characteristics in the axial direction can be easily tuned by adjusting the dimension of the protruding portion in the direction perpendicular to the axis, that is, the length in the circumferential direction and the protruding length in the direction perpendicular to the axis. It should be noted that the protrusion in the direction perpendicular to the axis does not have to have a flat plate shape. For example, by providing a stepped portion in the axial direction and appropriately adjusting the distance between the axially opposed surfaces with the small diameter portion of the outer member, the shaft It is also possible to tune the spring characteristics in the direction and the direction perpendicular to the axis.

Further, the anti-vibration device according to this embodiment can be suitably adopted when the power unit is suspended and supported by, for example, a vehicle body. That is, in the sixth aspect of the present invention, in the vibration isolator according to the fifth aspect, the inner member is inserted and arranged in the axial direction from one opening portion of the outer member, and the inner portion is arranged. The axially perpendicular protrusion of the material is positioned to face the small diameter portion of the outer member from the inside in the axial direction of the outer member, and the inner member is displaced outward from the axial direction from one opening of the outer member. It is a hanging type in which the compression rubber portion is subjected to compression deformation by being relatively displaced in the direction of protrusion.

A seventh aspect of the present invention is that in the vibration isolator according to any one of the first to sixth aspects, the outer bracket is fixed to the outer member, and the outer bracket is the same. Cylindrical contact portions are provided on the outer peripheral side of the inner member, and the tubular contact portion is provided with a cushioning rubber to the inner member or the inner bracket fixed to the inner member. A stopper mechanism is configured to buffer the relative displacement amount between the inner member and the outer member by abutting against each other.

According to the anti-vibration device having a structure according to this aspect, the stopper mechanism in the direction perpendicular to the axis can be realized with a simple structure, for example, the relative displacement between the inner member and the outer member in a plurality or all the directions perpendicular to the axis. A stopper mechanism that buffers the amount can also be realized as needed.

An eighth aspect of the present invention comprises an annular rubber elastic body that is externally fitted to the inner member and temporarily fixed by elasticity in the vibration isolator according to the seventh aspect. The body constitutes at least a part of the cushioning rubber.

According to the anti-vibration device having a structure according to this aspect, it is possible to realize a stopper mechanism having further excellent cushioning performance and durability by using an annular rubber elastic body that is separate from the main body rubber elastic body. .. Further, since the annular rubber elastic body is not fixed to the inner member, the degree of freedom of deformation is increased and better cushioning performance can be exhibited, and the inner bracket is attached after the annular rubber elastic body is temporarily fixed. Even in this case, since the annular rubber elastic body is temporarily fixed to the inner member, it is possible to avoid an obstacle to the mounting work of the inner bracket.

A ninth aspect of the present invention is the vibration isolator according to the seventh or eighth aspect, in which the cylindrical portion of the cylindrical contact portion projects toward the inner circumference at one end in the axial direction. A small-diameter protrusion is provided, and the stopper mechanism in the direction perpendicular to the axis that limits the amount of relative displacement of the inner member and the outer member in the direction perpendicular to the axis is such that the cylindrical portion is the inner member or the inner side. A small load stopper mechanism that contacts the bracket via the buffer rubber and a large load stopper mechanism that the small diameter protrusion abuts against the inner member or the inner bracket via the buffer rubber are included. It is composed of.

According to the vibration isolator having a structure according to this aspect, it is possible to realize a stopper mechanism capable of exerting a stepwise buffering action according to the magnitude of the input load in the direction perpendicular to the axis.

A tenth aspect of the present invention is that in the vibration isolator according to any one of the seventh to ninth aspects, the ends of the cylindrical contact portion on both sides in the axial direction are the inner member or the inner. The stopper mechanism in the axial direction that limits the amount of relative displacement of the inner member and the outer member in the axial direction is configured by abutting against the side bracket via the buffer rubber.

According to the anti-vibration device having a structure according to this aspect, by using the inner member and the inner side bracket, a stopper mechanism that functions on both sides in the axial direction can be realized with a simple structure.

According to the anti-vibration device having a structure according to the present invention, the compressed rubber portion and the sheared rubber portion share the functions with respect to the input in the axial direction and the orthogonal direction of each axis, and the axial direction and the orthogonal direction of each axis are shared. The degree of freedom in tuning the spring characteristics of the spring is improved, and for example, it is possible to set a large spring ratio in two directions orthogonal to the axial direction while ensuring the support spring characteristics in the axial direction.

FIG. 3 is a vertical cross-sectional view showing a vibration isolator as an embodiment of the present invention in a state of being mounted on a vehicle, and is a view corresponding to an I-I cross section in FIG. FIG. 3 is a perspective view showing a state in which an outer bracket and an annular rubber elastic body are attached to the vibration isolator shown in FIG. The plan view of the vibration isolation device shown in FIG. The bottom view of the vibration isolation device shown in FIG. FIG. 3 is a sectional view taken along line VV in FIG. FIG. 3 is a sectional view taken along line VI-VI in FIG. FIG. 3 is a perspective view showing a state in which the inner member and the outer member constituting the vibration isolator shown in FIG. 1 are coaxially arranged. FIG. 3 is a perspective view showing an integrally vulcanized molded product of a main body rubber elastic body constituting the vibration isolation device shown in FIG. 1. FIG. 3 is a perspective view showing an annular rubber elastic body constituting the vibration isolation device shown in FIG. 1 from the plane side. The perspective view which shows the annular rubber elastic body shown in FIG. 9 from the bottom surface side. The perspective view which shows the state before assembling the annular rubber elastic body in the vibration isolation device shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, FIG. 1 shows an automobile engine mount 10 as an embodiment of the vibration isolator according to the present invention in a state of being mounted on a vehicle. That is, the inner side bracket 12 is fixed to the engine mount 10, the inner side bracket 12 is fixed to a power unit (not shown), and the outer side is fixed to the engine mount 10 as shown in FIGS. The bracket 14 is fixed, and the outer bracket 14 is fixed to the vehicle body 16. As a result, the power unit is elastically connected and supported with respect to the vehicle body 16 via the engine mount 10. In particular, in the present embodiment, the power unit is supported in a suspended state with respect to the vehicle body 16, and the engine mount 10 is a suspended type. Note that FIG. 1 shows the engine mount 10 in the vehicle-mounted state, and when the shared support load of the power unit is applied to the engine mount 10, the inner member 18 is more than in the state shown in FIGS. 2 to 6. And the outer member 20 are displaced from each other in the axial direction in which the rubber elastic body 22 of the main body is subjected to compressive deformation.

Further, in the following description, the axial direction means the vertical direction in FIG. 1, which is the central axial direction of the inner member 18 and the outer member 20. Further, the vertical direction means a vertical direction in FIG. 1, which is a substantially vertical direction when mounted on a vehicle. Further, the front-rear direction means the left-right direction in FIGS. 1 and 5, and the left-right direction means the left-right direction in FIG. 6, but the direction when mounted on the vehicle is limited to these directions. is not.

More specifically, the engine mount 10 has a structure in which an inner member 18 and a tubular outer member 20 arranged at a predetermined distance from each other are elastically connected to each other by a main body rubber elastic body 22.

The inner member 18 is made of metal, a hard synthetic resin, or the like as a whole, and has a substantially rectangular tubular shape extending in the axial direction at a substantially central portion of the lower surface of the bottom wall of the flat plate-shaped portion 24 extending in a direction perpendicular to the axis. The upper end of the fixing metal fitting 26 is fixed by welding or the like. The fixing bracket 26 has a nut structure in which a female screw is engraved in the center hole 28 thereof. On the other hand, the flat plate-shaped portion 24 includes a protrusion 30 in the direction perpendicular to the axis that protrudes outward in the direction perpendicular to the axis from the fixing metal fitting 26.

In the present embodiment, the protruding dimensions of the protrusions 30 in the direction orthogonal to the axis in the direction perpendicular to the axis are different in the circumferential direction, and the flat plate-shaped portion 24 is said to have a dimension D ₁ in the front-rear direction (see FIG. 5). The horizontal dimension D ₂ (see FIG. 6), which is the direction orthogonal to the direction, is larger (D ₁ <D ₂ ). As a result, the flat plate-shaped portion 24 has a substantially oval or substantially rectangular planar shape in which the left-right direction is the longitudinal direction as compared with the front-rear direction, and the protrusion dimension in the axially perpendicular direction protrusion 30 is large. A pair of portions 32, 32 are provided on both sides in the left-right direction (both sides in the left-right direction in FIG. 6), and portions 34, 34 having a small protrusion dimension are provided on both sides in the front-rear direction (both sides in the left-right direction in FIGS. A pair is provided in. In particular, in the present embodiment, the left-right end portions in the longitudinal direction are located above the central portion in the axial direction via the stepped portion provided in the radial intermediate portion.

Further, the outer member 20 has a thin-walled large-diameter substantially cylindrical shape. The lower portion of the outer member 20 is an inner flange-shaped rubber fixing portion 36 extending inward in the direction perpendicular to the axis. That is, in the present embodiment, the inner diameter dimension is reduced in the rubber fixing portion 36 of the outer member 20, and the small diameter portion extending toward the inner circumference in the lower opening portion of the outer member 20 is composed of the rubber fixing portion 36. ing. An annular rib projecting downward is provided on the inner peripheral edge of the rubber fixing portion 36. On the other hand, the upper portion of the outer member 20 is a large-diameter tubular portion 38 having a straight cylindrical shape.

In the present embodiment, the protrusion dimension of the rubber fixing portion 36 inward in the direction perpendicular to the axis is different on the circumference, and the inner hole 39 (lower opening of the outer member 20) of the rubber fixing portion 36 is substantially abbreviated. It has an elliptical shape or a substantially rectangular shape. Specifically, the inner diameter dimension d ₁ (see FIG. 5) in the front-rear direction of the rubber fixing portion 36 is larger (d ₂ <d ₁ ) than the inner diameter dimension d ₂ (see FIG. 6) in the left-right direction. In particular, in the present embodiment, the inner diameter dimension d ₁ of the rubber fixing portion 36 is larger than the width dimension D ₁ of the flat plate portion 24 in the front-rear direction (D ₁ <d ₁ ), while in the left-right direction. The inner diameter dimension d ₂ of the rubber fixing portion 36 is smaller than the width dimension D ₂ of the flat plate-shaped portion 24 (d ₂ <D ₂ ).

Further, an annular step portion 40 extending outward in the radial direction is integrally formed in the upper opening portion (open portion of the large diameter tubular portion 38) of the outer member 20, and the outer peripheral edge portion of the step portion 40 is integrally formed. Is integrally formed with a cylindrical caulking portion 42 extending upward in the axial direction. In the product state shown in FIG. 1 and the like, the crimped portion 42 is crimped, and the tip of the crimped portion 42 is bent inward in the direction perpendicular to the axis.

As shown in FIG. 7, the inner member 18 and the outer member 20 are positioned at a predetermined distance in the radial direction so that the central axes of both members 18 and 20 are positioned substantially coaxially. ing. That is, the inner member 18 is inserted downward from the upper opening portion of the outer member 20 and arranged, and the fixing metal fitting 26 of the inner member 18 is inserted and arranged in the lower opening in the axial direction of the outer member 20 and is arranged at the lower end. A portion protrudes downward from the outer member 20. On the other hand, the flat plate-shaped portion 24 (protruding portion 30 in the direction perpendicular to the axis) is arranged in the large-diameter tubular portion 38 and is located above the rubber fixing portion 36 (inward in the axial direction).

A main body rubber elastic body 22 is arranged between the inner member 18 and the outer member 20 so as to face each other in the radial direction. The main body rubber elastic body 22 has a substantially tubular shape or a chevron-shaped block shape having a tapered outer peripheral surface whose radial dimension gradually decreases in the upward direction in the axial direction. In the main body rubber elastic body 22, the central portion having a small diameter protruding upward is vulcanized and adhered to the inner member 18, and the outer peripheral portion having a large diameter is vulcanized and adhered to the rubber fixing portion 36 of the outer member 20. That is, as shown in FIG. 8, the main body rubber elastic body 22 is formed as an integrally vulcanized molded product 44 including an inner member 18 and an outer member 20.

As a result, the inner member 18 and the outer member 20 are elastically connected to each other by the main body rubber elastic body 22, and the lower opening of the outer member 20 is fluidly closed by the main body rubber elastic body 22 and the inner member 18. Has been done. In particular, in the present embodiment, the upper portion of the inner member 18 including the flat plate-shaped portion 24 and the upper end portion of the fixing bracket 26 is embedded in the central portion of the main body rubber elastic body 22. The covered rubber layer 50 covering the upper surface of the flat plate-shaped portion 24 is shown with a recess by a jig for positioning the inner member 18 in the rubber molding cavity, but such a recess is not essential.

Further, an inner rubber layer 46 integrally formed with the main body rubber elastic body 22 is adhered to the outer peripheral surface of the fixing metal fitting 26. Further, an outer rubber layer 48 integrally formed with the main body rubber elastic body 22 is adhered to the inner peripheral surface of the outer member 20 over substantially the entire surface.

Further, in the present embodiment, the partition member 52 and the diaphragm 66 described later are arranged in the upper opening of the outer member 20.

The partition member 52 has a substantially disk shape of a thick wall made of metal or a hard synthetic resin as a whole, and the partition member main body 54 and the lid plate member 56 overlapped with the lower surface of the partition member main body 54. Is configured to include. The partition member main body 54 has a substantially disk shape, and a peripheral groove 58 that opens on the lower surface and continuously extends in the circumferential direction with a predetermined length is formed on the outer peripheral portion. In the present embodiment, the central portion of the partition member main body 54 is lightened to form circular recesses 60 and 62 that open on the upper surface and the lower surface.

Further, the lid plate member 56 has a thin disk shape, and a central hole 64 is formed through the central portion, and the outer peripheral portion of the thick wall having the peripheral groove 58 formed in the partition member main body 54. It is superimposed on the underside of the. Then, the lid plate member 56 is overlapped and fixed on the lower surface of the partition member main body 54, so that the lower opening of the peripheral groove 58 is covered with the lid plate member 56 to form a tunnel-shaped passage. .. The lid plate member 56 has a diameter larger than that of the partition member main body 54, and the outer peripheral portion of the lid plate member 56 projects from the partition member main body 54 to the outer peripheral side.

On the other hand, the diaphragm 66 as a flexible film is made of a thin rubber film that is easily deformed, and has a substantially circular shape and a substantially dome shape that bulges outward. Further, a mounting cylinder fitting 68 having a large diameter and a substantially cylindrical shape is fixed to the outer peripheral edge of the diaphragm 66. An annular upper portion 70 extending inward in the radial direction is integrally formed at the upper end portion of the mounting cylinder fitting 68, and an annular lower portion 72 extending outward in the radial direction is integrally formed at the lower end portion of the mounting cylinder fitting 68. Has been done. The outer peripheral edge of the diaphragm 66 is vulcanized and adhered to the annular upper portion 70 of the mounting cylinder fitting 68. In the present embodiment, the diaphragm 66 is formed as an integrally vulcanized molded product provided with the mounting cylinder fitting 68. There is. Further, a seal rubber layer 74 integrally formed with the diaphragm 66 is adhered to the inner peripheral surface of the mounting cylinder metal fitting 68 over substantially the entire surface.

Thus, the mounting cylinder fitting 68 is overlapped with the partition member 52 from above, and the outer peripheral portion of the lid plate member 56 and the annular lower portion 72 of the mounting cylinder fitting 68 are overlapped with the stepped portion 40 of the outer member 20. It is crimped and fixed by the caulking portion 42. The outer peripheral surface of the partition member main body 54 is fitted to the inner peripheral surface of the mounting cylinder fitting 68 with the seal rubber layer 74 sandwiched between them, and the outer peripheral portion of the partition member main body 54 is the lid plate member 56 and the mounting cylinder fitting 68. It is sandwiched and fixed in the axial direction with the annular upper portion 70.

As a result, the upper opening of the outer member 20 is covered with the diaphragm 66, and inside the outer member 20, an incompressible fluid is blocked from the external space between the main body rubber elastic body 22 and the diaphragm 66. An enclosed fluid chamber 76 is formed. Further, inside the fluid chamber 76, the partition member 52 is fixedly supported by the outer member 20 so as to spread in the direction perpendicular to the axis, and the fluid chamber 76 is partitioned and divided into two by the partition member 52. ..

Then, on one side (lower side in FIG. 1) of the fluid chamber 76 with the partition member 52 sandwiched, a part of the wall portion is composed of the main body rubber elastic body 22, and the main body rubber elastic body 22 is formed at the time of vibration input. A pressure receiving chamber 78 is formed in which pressure fluctuations are generated based on elastic deformation. On the other hand, on the other side (upper side in FIG. 1) of the fluid chamber 76 sandwiching the partition member 52, a part of the wall portion is composed of the diaphragm 66, and the volume can be easily changed based on the elastic deformation of the diaphragm 66. A permissible equilibrium chamber 80 is formed in.

As the incompressible fluid sealed in the fluid chamber 76, for example, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like can be adopted, and in particular, prevention based on a flow action such as a resonance action of the fluid can be adopted. In order to effectively obtain the vibration effect, a low-viscosity fluid having a viscosity of 0.1 Pa · s or less is preferably adopted. Further, the incompressible fluid is sealed in the fluid chamber 76 including the pressure receiving chamber 78 and the equilibrium chamber 80, for example, the partition member 52 and the mounting cylinder for the integrally vulcanized molded product 44 of the main body rubber elastic body 22. This is achieved by assembling the metal fitting 68 (diaphragm 66) in an incompressible fluid.

Further, one end of the peripheral groove 58 (tunnel-shaped passage) is communicated with the pressure receiving chamber 78 through a communication hole 82 formed in the lid plate member 56, and the other end is the upper bottom of the peripheral groove 58. It communicates with the equilibrium chamber 80 through a communication hole (not shown) formed in the wall portion. As a result, the orifice passage 84 that communicates the pressure receiving chamber 78 and the equilibrium chamber 80 with each other is formed by utilizing the peripheral groove 58. The orifice passage 84 always connects the pressure receiving chamber 78 and the equilibrium chamber 80 in a communicating state.

Therefore, at the time of vibration input, a relative pressure fluctuation is induced between the pressure receiving chamber 78 in which the pressure fluctuation is induced and the equilibrium chamber 80 in which the volume change is allowed based on the deformation of the diaphragm 66. A fluid flow is generated between the two chambers 78 and 80 through the orifice passage 84. As a result, the anti-vibration effect based on the resonance action of the fluid flowing through the orifice passage 84 between the pressure receiving chamber 78 and the equilibrium chamber 80 is exerted against the vibration in the axial direction (vertical direction in FIG. 1). It has become like. That is, in the present embodiment, the engine mount 10 is a fluid-filled vibration isolation device.

Further, in the present embodiment, the annular rubber elastic body 86, which is a separate component shown in FIGS. 9 and 10, is attached to the engine mount 10 having such a shape. The annular rubber elastic body 86 is made of an elastic body such as rubber or an elastomer, has a substantially tubular shape as a whole, and is provided with a central hole 88 penetrating in the axial direction in the central portion. The inner peripheral shape of the central hole 88 is substantially equal to the outer peripheral shape of the fixing metal fitting 26 in the inner member 18, and is substantially rectangular in the present embodiment, and the diameter of the central hole 88 is outside the fixing metal fitting 26. It is slightly smaller in the front-back direction and / or the left-right direction than the diameter.

Further, on the peripheral wall of the annular rubber elastic body 86, a pair of bulging portions 90, 90 are provided on both sides in the front-rear direction (both sides in the left-right direction in FIGS. ing. In the present embodiment, the axially intermediate portion of the bulging portion 90 is the thickest and protrudes outward. Further, a pair of stepped portions 91, 91 protruding outward are provided on both sides in the left-right direction (both sides in the left-right direction in FIG. 6), and the portion below the stepped portion 91 has a large diameter and is downward in a skirt shape. Extends to. Furthermore, a plate-shaped cushioning portion 92 extending in the direction perpendicular to the axis is integrally formed at the lower end of the annular rubber elastic body 86. In the present embodiment, the cushioning portion 92 has a thin, substantially rectangular plate shape as a whole.

The annular rubber elastic body 86 having such a shape is externally fitted and fixed to the fixing metal fitting 26 of the inner member 18. In the present embodiment, the lower portion of the fixing metal fitting 26 is fitted into the upper end portion of the annular rubber elastic body 86, so that the annular rubber elastic body 86 is elastically non-adhesive to the fixing metal fitting 26 of the inner member 18. It is designed to be fixed.

In the present embodiment, by assembling the annular rubber elastic body 86 to the inner member 18, the lower end of the inner rubber layer 46 adhered to the outer peripheral surface of the fixing metal fitting 26 and the upper end of the annular rubber elastic body 86 are in contact with each other. While being in contact with each other, the fixing bracket 26 is inserted to the axially intermediate portion of the central hole 88, and the lower portion of the bulging portion 90 and the stepped portion 91 and the cushioning portion 92 are disengaged below the fixing bracket 26. Is located.

Further, in the engine mount 10 having the above-described structure, the inner bracket 12 is attached to the inner member 18, and the outer bracket 14 is attached to the outer member 20. The shapes of the inner and outer brackets 12 and 14 are not limited in any way, but in the present embodiment, the inner bracket 12 as a whole has an insertion hole 94 penetrating in the central portion in the axial direction. It has a substantially tubular shape, and the lower portion is a rectangular plate portion 96 that extends in the direction perpendicular to the axis. In particular, in the present embodiment, the rectangular plate portion 96 has a planar shape larger than that of the cushioning portion 92 at the lower end of the annular rubber elastic body 86.

Further, the upper portion of the inner bracket 12 is inserted into the central hole 88 of the annular rubber elastic body 86 from below, and is abutted against the lower end of the fixing metal fitting 26. Furthermore, the rectangular plate portion 96 of the inner side bracket 12 is overlapped with the cushioning portion 92 of the annular rubber elastic body 86 in a contact state from below. Then, the mounting bolt 98 inserted into the insertion hole 94 of the inner side bracket 12 is screwed into the fixing bracket 26, so that the inner side bracket 12 is fixed to the inner member 18 of the engine mount 10.

On the other hand, the outer bracket 14 of the present embodiment includes a cup-shaped portion 100 having a substantially bottomed tubular shape. The cup-shaped portion 100 has a substantially cylindrical peripheral wall portion 102 and an annular plate-shaped bottom wall portion 104 extending inward from the lower opening of the peripheral wall portion 102. A cylindrical rib protruding downward is provided on the inner peripheral edge of the bottom wall portion 104, and a through hole 106 penetrating in the axial direction is formed by the inner hole of the rib.

A cylindrical contact portion 108 extending in the vertical direction is press-fitted and fixed to the through hole 106, and is fixed by welding or the like as necessary. The tubular contact portion 108 is thicker than the cup-shaped portion 100, and the upper end portion of the tubular portion 110 extending substantially straight in the intermediate portion in the axial direction is toward the inner peripheral side. An annular small-diameter protrusion 112 that protrudes is provided.

The protrusion dimension of the small-diameter protrusion 112 toward the inner circumference is equal or slightly different on the circumference over the entire circumference, and in the present embodiment, the inner diameter dimension of the small-diameter protrusion 112 in the front-rear direction. E ₁ (see FIG. 5) is slightly larger (E ₂ <E ₁ ) than the inner diameter dimension E ₂ (see FIG. 6) of the small-diameter protrusion 112 in the left-right direction. In particular, in the present embodiment, the inner diameter dimension E ₁ of the small-diameter protrusion 112 is larger than the width dimension D ₁ of the flat plate-shaped portion 24 of the inner member 18 (D ₁ <E ₁ ) in the front-rear direction. In the left-right direction, the inner diameter dimension E ₂ of the small-diameter protrusion 112 is smaller than the width dimension D ₂ of the flat plate-shaped portion 24 of the inner member 18 (E ₂ <D ₂ ). As a result, in the axial direction, the flat plate-shaped portion 24 and the small-diameter projecting portion 112 are in a non-opposing state on both sides in the front-rear direction and are opposed to each other on both sides in the left-right direction.

On the other hand, at the lower end of the tubular portion 110, large-diameter protrusions 114 and 114 located on both sides in the left-right direction and projecting to the outer peripheral side are formed. As shown in FIGS. 2 to 6, before mounting on the vehicle, the lower end portion of the tubular portion 110 (cylindrical contact portion 108), that is, the large-diameter protrusion 114 is formed on the annular rubber elastic body 86. Although it is in contact with the upper surface of the cushioning portion 92, as shown in FIG. 1, in the mounted state on the vehicle, the shared supporting load of the power unit is applied to the inner member 18 and the inner member 18 is displaced downward relative to the outer member 20. The large-diameter protrusion 114 and the buffer 92 are separated from each other by a predetermined distance in the axial direction because of the squeeze.

Further, mounting plate portions 116a and 116b projecting to the front and rear of the vehicle (left and right in FIGS. 1 and 5) are fixed to the outer peripheral surface of the cup-shaped portion 100 by means such as welding. .. Bolt insertion holes 118 are formed in the mounting plate portions 116a and 116b.

Then, as shown in FIG. 11, the outer member 20 of the engine mount 10 is press-fitted and fixed to the cup-shaped portion 100 of the outer bracket 14 from above, and is fixed by means such as welding if necessary. Then, the outer bracket 14 is attached to the engine mount 10. In such a state, the mounting plate portions 116a and 116b are overlapped with the vehicle body 16, and the outer bracket 14 is bolted to the vehicle body 16 by the mounting bolts 120 inserted into the bolt insertion holes 118. There is.

Further, the upper portion of the tubular contact portion 108 of the outer bracket 14 enters the inside of the outer member 20 through the lower opening (inner hole 39) of the outer member 20, and is the upper end of the tubular contact portion 108. The portion (small diameter protrusion 112) is located at a position substantially equal to the rubber fixing portion 36 of the outer member 20 in the vertical direction. As a result, the small-diameter protrusion 112 faces the fixing metal fitting 26 in the inner member 18 via the inner rubber layer 46 in the front-rear direction and the left-right direction, that is, the cylindrical contact portion 108 is on the outer peripheral side of the inner member 18. On both sides in the left-right direction, the flat plate-shaped portion 24 of the inner member 18 is axially opposed to the inner rubber layer 46 via the inner rubber layer 46.

Further, from the state shown in FIG. 11, the annular rubber elastic body 86 is attached to the inner member 18 to be in the state shown in FIGS. 2 to 6, and in such a state, the annular rubber elastic body 86 is formed in the front-rear direction. The bulging portion 90 and the tubular portion 110 of the tubular contact portion 108 face each other with a predetermined distance from each other, and in the left-right direction, the stepped portion of the annular rubber elastic body 86. The 91 and the tubular portion 110 of the tubular contact portion 108 are opposed to each other with a predetermined distance from each other. In the present embodiment, in the front-rear direction, the separation distance F ₁ between the bulging portion 90 and the tubular portion 110 (see FIG. 5) is the separation distance F ₂ between the small-diameter protrusion 112 and the inner rubber layer 46 (see FIG. 5). In addition to being smaller than (F ₁ <F ₂ ), the separation distance f ₁ (see FIG. 6) between the stepped portion 91 and the tubular portion 110 in the left-right direction is the small diameter protrusion 112 and the inner rubber layer 46. It is smaller (f ₁ <f ₂ ) than the separation distance f ₂ (see FIG. 6).

Furthermore, the inner bracket 12 is attached from the state shown in FIGS. 2 to 6, and the state is as shown in FIG. 1, so that the lower end portion of the tubular contact portion 108 is rectangular in the inner bracket 12. It is adapted to face each other in the vertical direction with respect to the plate portion 96 via the cushioning portion 92 of the annular rubber elastic body 86. In the present embodiment, since the large-diameter protrusions 114 and 114 are provided on both sides of the lower end of the tubular contact portion 108 in the left-right direction, the lower end of the tubular contact portion 108 and the rectangle on the inner side bracket 12 are rectangular. A large area can be secured at the portion facing the plate portion 96.

Here, in the engine mount 10 of the present embodiment, as described above, the flat plate-shaped portion 24 of the inner member 18 and the lower opening (inner hole of the rubber fixing portion 36) of the outer member 20 are both circular in shape. It has a different shape from that of the above, and specifically, it has a substantially elliptical shape or a substantially rectangular shape.

In particular, in the present embodiment, since the inner diameter dimension d ₁ of the rubber fixing portion 36 is larger than the width dimension D ₁ of the flat plate-shaped portion 24 (D ₁ <d ₁ ) in the front-rear direction, the inner member 18 The flat plate-shaped portion 24 (parts 34, 34 having a small protruding dimension) and the rubber fixing portion 36 of the outer member 20 are separated from each other in the direction perpendicular to the axis so as not to face each other in the axial direction. That is, a non-opposing portion 122 is formed between the flat plate-shaped portions 24 (parts 34, 34 having a small protruding dimension) on both sides in the front-rear direction and the rubber fixing portion 36, and the non-opposing portion 122 is in the direction perpendicular to the axis. Of these, a pair is provided facing each other in the front-rear direction.

On the other hand, in the present embodiment, since the inner diameter dimension d ₂ of the rubber fixing portion 36 is smaller than the width dimension D ₂ of the flat plate-shaped portion 24 (d ₂ <D ₂ ) in the left-right direction, the inner member 18 The flat plate-shaped portion 24 (parts 32, 32 having a large protruding dimension) and the rubber fixing portion 36 of the outer member 20 face each other in the axial direction. That is, an opposed portion 124 is formed between the flat plate-shaped portions 24 (parts 32 and 32 having a large protruding dimension) on both sides in the left-right direction and the rubber fixing portion 36, and the opposed portion 124 is in the direction perpendicular to the axis. A pair of non-opposing portions 122, 122 are provided so as to face each other in the left-right direction, which is a direction orthogonal to the opposite direction.

In the non-opposing portion 122, the main body rubber elastic body 22 is sheared and deformed when the inner member 18 and the outer member 20 are displaced relative to each other in the axial direction when a load is input in the axial direction. That is, the main body rubber elastic body 22 provided on the non-opposing portion 122, that is, both side portions in the front-rear direction of the main body rubber elastic body 22 are shear rubber portions 126 and 126, and the inner members 18 are separated from each other in the radial direction. The flat plate-shaped portion 24 and the rubber fixing portion 36 of the outer member 20 are elastically connected.

On the other hand, in the facing portion 124, the main body rubber elastic body 22 is compressively deformed when the inner member 18 and the outer member 20 are relatively displaced in the axial direction at the time of inputting a load in the axial direction. That is, the main body rubber elastic body 22 provided at the axially opposed portion 124 between the flat plate-shaped portion 24 and the rubber fixing portion 36, that is, the left and right side portions of the main body rubber elastic body 22 are the compressed rubber portions 128 and 128. Has been done. Specifically, the inner member 18 is displaced downward from the lower opening portion of the outer member 20, so that the compression rubber portions 128 and 128 are subjected to compression deformation. In the present embodiment, the shear rubber portion 126 is thinner than the compression rubber portion 128 in consideration of the shear spring characteristics of the shear rubber portion 126 and the compression spring characteristics of the compression rubber portion 128.

When axial (vertical) vibration is input to the engine mount 10 of the present embodiment having the above structure, shear deformation mainly occurs in the shear rubber portion 126 of the main body rubber elastic body 22. At the same time, compression / tensile deformation is mainly caused in the compressed rubber portion 128. The volume change of the pressure receiving chamber 78 due to the deformation of the main body rubber elastic body 22 induces the flow of the incompressible fluid through the orifice passage 84, so that the vibration in the vertical direction is reduced. Further, when vibration in the direction perpendicular to the axis (front-back direction and / or left-right direction) is input, shear deformation is mainly generated in both the shear rubber portion 126 and the compression rubber portion 128, so that the spring characteristics are soft. Can be demonstrated. In particular, in the present embodiment, both the shear rubber portion 126 and the compressed rubber portion 128 have an elastic spindle that spreads downward and inclines, and different rubber thicknesses are set for the shear rubber portion 126 and the compressed rubber portion 128. Further, the flat plate-shaped portion 24 to which the compressed rubber portion 128 is fixed is provided with a stepped portion at the protrusion 30 in the direction perpendicular to the axis, so that the elastic deformation at the time of vibration input in the direction perpendicular to the axis is also possible. A compression / tension component is generated, and the spring characteristics are different in the front-rear direction and the left-right direction, and the spring characteristics are softer in the front-rear direction than in the left-right direction.

Here, since the portions on both sides of the flat plate-shaped portion 24 of the inner member 18 in the front-rear direction and the small-diameter protrusion 112 in the cylindrical contact portion 108 face each other in the vertical direction, vibration in the bound direction is input. At that time, the flat plate-shaped portion 24 and the small-diameter projecting portion 112 come into contact with each other via the inner rubber layer 46, so that the relative displacement amount between the inner member 18 and the outer member 20 is limited in a buffering manner. It has become. That is, in the present embodiment, the stopper mechanism 130 in the bounce direction is configured to include both sides of the flat plate-shaped portion 24 in the front-rear direction and the small-diameter protrusion 112.

Further, since the lower end portions (particularly the large-diameter protrusions 114 and 114) of the cylindrical contact portion 108 and the rectangular plate portions 96 of the inner side bracket 12 face each other in the vertical direction, vibration in the rebound direction is generated. When input is made, the lower end portions (large-diameter protrusions 114, 114) of these cylindrical contact portions 108 and the rectangular plate portion 96 of the inner bracket 12 come into contact with each other via the cushioning portion 92. The amount of relative displacement between the inner member 18 and the outer member 20 is limited. That is, in the present embodiment, the stopper mechanism 132 in the rebound direction is configured to include the lower end portions (large-diameter protrusions 114, 114) of the cylindrical contact portion 108 and the rectangular plate portion 96 of the inner side bracket 12. There is.

Further, since the cylindrical contact portion 108 and the upper portion of the fixing bracket 26 of the inner member 18 and the upper portion of the inner bracket 12 face each other in the axially perpendicular direction (front-rear direction and left-right direction), the axially perpendicular direction. When the vibration of is input, the cylindrical contact portion 108 and the inner member 18 and / or the inner side bracket 12 come into contact with each other, so that the relative displacement amount between the inner member 18 and the outer member 20 is limited. It is supposed to be done.

That is, since the separation distance F ₂ between the small-diameter protrusion 112 and the inner rubber layer 46 is larger than the separation distance F ₁ between the tubular portion 110 and the bulging portion 90, vibration in the front-rear direction is generated. When input is made, first, the tubular portion 110 and the bulging portion 90 abut (the tubular portion 110 abuts on the inner member 18 and / or the inner side bracket 12 via the bulging portion 90). As a result, the amount of displacement is suppressed. Then, when a load larger than that is input, the small-diameter protrusion 112 and the inner rubber layer 46 come into contact with each other (the small-diameter protrusion 112 comes into contact with the inner member 18 via the inner rubber layer 46), so that the displacement amount. Is becoming more reliably restricted. That is, in the present embodiment, the small load stopper mechanism 134 in the front-rear direction is configured including the cylindrical portion 110 and the inner member 18 and / or the inner side bracket 12, and these are applied via the bulging portion 90. By coming into contact with each other, the relative displacement amount between the inner member 18 and the outer member 20 is limited in a buffering manner. Further, a large load stopper mechanism 136 in the front-rear direction is configured including the small-diameter protrusion 112 and the inner member 18, and when these come into contact with each other via the inner rubber layer 46, the inner member 18 and the outer member 20 are brought into contact with each other. The relative displacement amount is buffered and surely limited.

Similarly, since the separation distance f ₂ between the small-diameter protrusion 112 and the inner rubber layer 46 is larger than the separation distance f ₁ between the tubular portion 110 and the stepped portion 91, vibration in the left-right direction Is input, a small load stopper mechanism 138 in the left-right direction is configured including the tubular portion 110 and the inner member 18 and / or the inner side bracket 12, and these are formed via the stepped portion 91. By abutting, the relative displacement amount between the inner member 18 and the outer member 20 is limited in a buffering manner. Further, a large load stopper mechanism 140 in the left-right direction is configured including the small-diameter protrusion 112 and the inner member 18, and when these come into contact with each other via the inner rubber layer 46, the inner member 18 and the outer member 20 are brought into contact with each other. The relative displacement amount is buffered and surely limited.

That is, in the present embodiment, the stopper mechanisms 130, 132, 134, 136, 138, 140 are configured in each of the vertical direction (bound direction and rebound direction), the front-rear direction, and the left-right direction, and each stopper mechanism is configured. In 130, 132, 134, 136, 138, 140, the relative displacement amount between the inner member 18 and the outer member 20 is bufferedly limited by the inner rubber layer 46 and / or the annular rubber elastic body 86. Therefore, in the present embodiment, the cushioning rubber 142 is configured by including the inner rubber layer 46 and the annular rubber elastic body 86.

In the engine mount 10 of the present embodiment having the above structure, the support spring strength with respect to the power unit is secured by the compressed rubber portions 128 and 128 in the main body rubber elastic body 22. On the other hand, since the spring characteristics for vibration in the direction perpendicular to the axis are different between the sheared rubber portions 126 and 126 and the compressed rubber portions 128 and 128, the spring ratio is increased in the two directions orthogonal to the axis perpendicular to the front-rear direction and the left-right direction. It is also possible to set. That is, by partially providing the shear rubber portion 126 and the compression rubber portion 128 in the main body rubber elastic body 22, a large degree of freedom in tuning the spring characteristics in the axial direction and the axial perpendicular direction can be ensured.

In particular, in the present embodiment, the shear rubber portion 126 is provided in the non-opposing portion 122 between the inner member 18 (flat plate-shaped portion 24) having a small protruding dimension and the outer member 20, and the compressed rubber portion 128. Is provided in the facing portion 124 between the portion 32 having a large protruding dimension and the outer member 20 in the inner member 18 (flat plate-shaped portion 24). That is, the shear rubber portion 126 and the compressed rubber portion 128 can be easily formed by providing the inner member 18 with a portion 34 having a small protrusion dimension and a portion 32 having a large protrusion dimension, for example, having a different shape from the circular shape.

Further, the shear rubber portions 126 are provided in pairs in the front-rear direction, and the compression rubber portions 128 are provided in pairs in the left-right direction, so that the spring ratio in the two directions perpendicular to the axes orthogonal to each other is increased. Easy to set.

Further, in the present embodiment, since the stopper mechanisms 130, 132, 134, 136, 138, 140 are provided for vibrations in the vertical direction, the front-rear direction, and the left-right direction, the inner member 18 is provided in each direction. The amount of relative displacement between the outer member 20 and the outer member 20 is limited, and the durability of the main body rubber elastic body and the like can be improved. In particular, since each of the stopper mechanisms 130, 132, 134, 136, 138, 140 is provided with a cushioning rubber 142 including an inner rubber layer 46 and an annular rubber elastic body 86, the inner member 18 and the outer member 18 are provided. The amount of displacement relative to 20 can be limited in a cushioning manner, and the generation of abnormal noise and impact due to the impact between the inner member 18 and the outer member 20 can be reduced.

In particular, since the small load stopper mechanisms 134 and 138 and the large load stopper mechanisms 136 and 140 are provided in the front-rear direction and the left-right direction, a stepwise stopper mechanism is configured to exert a higher buffering action. Can be done.

Although one embodiment of the present invention has been described above, this is merely an example, and the present invention is not to be interpreted in a limited manner by the specific description in the embodiment.

For example, in the above-described embodiment, a pair of facing portions 124 (compressed rubber portions 128 in the main body rubber elastic body 22) of the inner member 18 and the outer member 20 are provided on both sides in the left-right direction, and a non-opposing portion 122 (sheared rubber portion) is provided. A pair of 126) are provided on both sides in the front-rear direction, but the present invention is not limited to this mode. That is, the facing portion (compressed rubber portion) and the non-opposing portion (shear rubber portion) need only be partially formed on the circumference, and the number and the forming position on the circumference are not limited in any way and are required. It can be appropriately set according to the spring characteristics.

Further, in the above-described embodiment, the flat plate-shaped portion 24 of the inner member 18 and the small diameter portion (rubber fixing portion 36) of the outer member 20 are provided with different shapes, and the facing portion 124 and the non-opposing portion 122 are provided. One of the outer member and the outer member may have a rotationally symmetric shape, and the other may have a different shape. Further, it is also possible to adjust the spring characteristics in the axial direction and the axial perpendicular direction by providing a portion protruding in the axial direction from the flat plate-shaped portion or the small diameter portion (rubber fixing portion).

Furthermore, the shapes of the outer bracket and the inner bracket are not limited to those described in the above-described embodiment, and for example, the cylindrical contact portion in the outer bracket is not essential. That is, in the above-described embodiment, the stopper mechanisms 130, 132, 134, 136, 138, and 140 are configured to include the cylindrical contact portion 108, but these stopper mechanisms are not essential. Further, even when the stopper mechanism is provided in the front-rear direction or the left-right direction, it is not necessary to use the stepwise stopper mechanism as in the above-described embodiment.

Further, in the above embodiment, the inner rubber layer 46, the outer rubber layer 48, and the coated rubber layer 50 are integrally formed with the main body rubber elastic body 22, but these may be formed as separate bodies and post-fixed. .. Further, in the above-described embodiment, the annular rubber elastic body 86 is formed as a separate body from the main body rubber elastic body 22, but may be formed integrally. However, in the present invention, the annular rubber elastic body is not indispensable.

Furthermore, in the above-described embodiment, the engine mount 10 is a fluid-filled type, but the engine mount 10 is not limited to the fluid-filled type. It can also be configured as a vibration isolator. Further, in the above-described embodiment, the engine mount 10 is a suspended type, but the engine mount 10 is not limited to the suspended type. For example, the engine mount 10 projects downward from the central portion of the main body rubber elastic body shown in the above-described embodiment. Instead of the inner member, an inner member protruding upward may be adopted, and a configuration may be adopted in which a power unit is mounted on the inner member to support vibration isolation. Further, in the above-described embodiment, an engine mount for an automobile is shown as a vibration isolator according to the present invention, but the present invention may be applied to a strut mount, a member mount, a body mount, or the like for an automobile. , May be applied to anti-vibration devices other than automobiles.
In addition, the present invention originally includes all of the inventions described in the following (i) to (ix), and the configuration and action / effect thereof will be added.
The present invention
(I) In a vibration isolator in which an inner member and a tubular outer member are connected by a rubber elastic body of the main body, the inner member and the outer member are mutually axially opposed to each other in the axial direction. Non-opposing portions that deviate in the perpendicular direction and do not face each other in the axial direction are partially provided in the circumferential direction, and the rubber elastic body of the main body has the inner member and the outer member in the facing portion. It is characterized in that a compression rubber portion that is compressively deformed by a relative displacement in the axial direction and a shear rubber portion that is sheared and deformed by a relative displacement in the axial direction between the inner member and the outer member are provided in the non-opposing portion. Anti-vibration device,
(Ii) In the inner member and the outer member, a pair of the facing portions are provided at positions facing each other in the direction perpendicular to the axis, and the pair of facing portions are located in the direction orthogonal to the axis orthogonal to the axis perpendicular direction. The anti-vibration device according to (i), wherein the pair of non-opposing portions are provided at opposite positions.
(Iii) One opening of the outer member is provided with a small diameter portion that expands toward the inner circumference, while the inner member has a protrusion dimension in the direction perpendicular to the axis that is different in the direction perpendicular to the axis. A protrusion is provided, and a portion having a large protrusion dimension in the protrusion in the direction perpendicular to the axis is positioned so as to face the small diameter portion of the outer member in the axial direction, whereby the inner member and the outer member are formed. The anti-vibration device according to (i) or (ii), wherein the facing portion in the axial direction is formed.
(Iv) The inner member is inserted and arranged in the axial direction from one opening portion of the outer member, and the protrusion in the axial direction perpendicular to the inner member is formed on the outer member with respect to the small diameter portion of the outer member. The position is opposed from the inside in the axial direction, and the inner member is relatively displaced in the direction in which the inner member protrudes outward in the axial direction from one opening portion of the outer member, so that the compressed rubber portion is subjected to compressive deformation. The anti-vibration device according to (iii), which is a hanging type.
(V) The outer bracket is fixed to the outer member, and the outer bracket is provided with a cylindrical contact portion separated from the inner member on the outer peripheral side, and the tubular contact portion is provided. A stopper mechanism that buffers the relative displacement between the inner member and the outer member by contacting the contact portion with the inner member or the inner bracket fixed to the inner member via a buffer rubber. The anti-vibration device according to any one of (i) to (iv).
(Vi) An annular rubber elastic body that is externally fitted to the inner member and temporarily fixed by elasticity is provided, and at least a part of the cushioning rubber is formed by the annular rubber elastic body (v). The described anti-vibration device,
(Vii) A small-diameter protrusion that protrudes toward the inner circumference is provided at one end of the cylindrical portion of the cylindrical contact portion in the axial direction, and the inner member and the outer member are in the direction perpendicular to the axis. The stopper mechanism in the direction perpendicular to the axis that limits the amount of relative displacement to the inner member, the small load stopper mechanism in which the cylindrical portion contacts the inner member or the inner bracket via the buffer rubber, and the small diameter collision. The anti-vibration device according to (v) or (vi), wherein the portion includes a large load stopper mechanism that abuts the inner member or the inner side bracket via the buffer rubber.
(Viii) The inner member and the outer member are brought into contact with each other by abutting the ends of the tubular contact portion on both sides in the axial direction with the inner member or the inner bracket via the cushioning rubber. The anti-vibration device according to any one of (v) to (vii), wherein the stopper mechanism in the axial direction for limiting the amount of relative displacement in the axial direction is configured.
(Ix) A pressure receiving chamber in which a wall portion is formed of the rubber elastic body of the main body to input vibration and an equilibrium chamber in which a wall portion is formed of a flexible film are provided, and these pressure receiving chamber and the equilibrium chamber are separated from each other. The anti-vibration device according to any one of (i) to (viii), which is a fluid-filled anti-vibration device communicated with an orifice passage.
Including inventions related to.
In the invention described in (i) above, the load input mode to the rubber elastic body of the main body is different in the circumferential direction, and it is possible to obtain a large support spring strength by the compressed rubber portion for the axial input. On the other hand, for the input in the direction perpendicular to the axis, it is possible to set a large spring ratio in the compressed rubber portion and the sheared rubber portion. Further, since the shear deformation is dominated by the deformation of the sheared rubber portion at the time of axial input, a large stress concentration can be avoided even if the non-compressed rubber portion has a low spring. As described above, according to the present invention, the compression rubber portion and the shear rubber portion share the functions with respect to the input in the axial direction and the directions perpendicular to each axis, and the spring characteristics in the axial direction and the directions perpendicular to each axis are exhibited. The degree of freedom of tuning can be improved and facilitated.
In the invention described in (ii) above, the compressed rubber portion and the sheared rubber portion can be arranged substantially evenly in the circumferential direction, and the deformation of the main body rubber elastic body including the compressed rubber portion and the sheared rubber portion as a whole. Aspects can be stabilized. In addition, it is easy to set a large spring ratio in two directions perpendicular to the axis by making the spring characteristics different from each other in the direction perpendicular to the axis where the compressed rubber portion faces and the direction perpendicular to the axis where the shear rubber portion faces. ..
In the invention described in (iii) above, the inner member has a different shape from the circular shape in a plan view, so that the opposed portion and the non-opposed portion can be realized with a simple structure. Further, the spring characteristics in the axial direction can be easily tuned by adjusting the dimension of the protruding portion in the direction perpendicular to the axis, that is, the length in the circumferential direction and the protruding length in the direction perpendicular to the axis. It should be noted that the protrusion in the direction perpendicular to the axis does not have to have a flat plate shape. For example, by providing a stepped portion in the axial direction and appropriately adjusting the distance between the axially opposed surfaces with the small diameter portion of the outer member, the shaft It is also possible to tune the spring characteristics in the direction and the direction perpendicular to the axis.
In the invention described in (v) above, the stopper mechanism in the direction perpendicular to the axis can be realized with a simple structure, and for example, the relative displacement amount between the inner member and the outer member in a plurality or all the directions perpendicular to the axis is buffered. A stopper mechanism that limits the number of parts to the above can also be realized as needed.
In the invention described in (vi) above, by using an annular rubber elastic body that is separate from the main body rubber elastic body, a stopper mechanism having further excellent cushioning performance and durability can be realized. Further, since the annular rubber elastic body is not fixed to the inner member, the degree of freedom of deformation is increased and better cushioning performance can be exhibited, and the inner bracket is attached after the annular rubber elastic body is temporarily fixed. Even in this case, since the annular rubber elastic body is temporarily fixed to the inner member, it is possible to avoid an obstacle to the mounting work of the inner bracket.
In the invention described in (vii) above, it is possible to realize a stopper mechanism capable of exerting a stepwise buffering action according to the magnitude of the input load in the direction perpendicular to the axis.
In the invention described in the above (viii), by using the inner member and the inner side bracket, a stopper mechanism that functions on both sides in the axial direction can be realized with a simple structure.

10: Engine mount (vibration isolation device), 14: Outer side bracket, 18: Inner member, 20: Outer member, 22: Main body rubber elastic body, 30: Protrusion in the direction perpendicular to the axis, 32: Large protruding dimension, 34 : Small protruding dimension, 36: Rubber fixing part (small diameter part), 66: Diaphragm (flexible film), 78: Pressure receiving chamber, 80: Balance chamber, 84: orifice passage, 86: Annular rubber elastic body, 108 : Cylindrical contact part, 110: Cylindrical part, 112: Small diameter protrusion, 122: Non-opposing part, 124: Facing part, 126: Sheeping rubber part, 128: Compressed rubber part, 130: Stopper mechanism in bound direction, 132: Stopper mechanism in the rebound direction, 134: Small load stopper mechanism in the front-rear direction, 136: Large load stopper mechanism in the front-rear direction, 138: Small load stopper mechanism in the left-right direction, 140: Large load stopper mechanism in the left-right direction, 142: Buffer rubber

Claims (10)

In a vibration isolation device in which an inner member and a cylindrical outer member are connected by a rubber elastic body of the main body.
Between the inner member and the outer member, an opposing portion that faces in the axial direction and a non-opposing portion that deviates from each other in the direction perpendicular to the axis and does not face in the axial direction are partially provided in the circumferential direction. With
The main body rubber elastic body includes a compression rubber portion that is compressionally deformed by a relative displacement of the inner member and the outer member in the axial direction at the facing portion, and a shaft between the inner member and the outer member at the non-opposing portion. While there is a sheared rubber part that is sheared and deformed by relative displacement in the direction,
Neither the compressed rubber portion nor the sheared rubber portion of the main body rubber elastic body directly connects the facing surfaces of the inner member and the outer member in the direction perpendicular to the axis, and the inner member and the outer member are not directly connected to each other. A vibration isolator characterized in that it is sheared and deformed when the member is displaced relative to the axis perpendicular to the axis . The outer member has a cylindrical shape, and one opening portion is provided with a small diameter portion that expands toward the inner circumference.
The inner member is provided with a protrusion in the direction perpendicular to the axis whose protrusion dimension in the direction perpendicular to the axis is different in the circumferential direction.
The vibration isolator according to claim 1 , wherein the protrusion in the direction perpendicular to the axis is arranged inside the outer member in a housed state, and the small diameter portion is connected by the rubber elastic body of the main body. A pressure receiving chamber in which a wall portion is formed of the rubber elastic body of the main body and vibration is input and an equilibrium chamber in which a wall portion is formed of a flexible film are provided, and these pressure receiving chamber and the equilibrium chamber are formed by an orifice passage. It is said to be a fluid-filled anti-vibration device that is communicated with each other.
The inner member is provided with a protrusion in the direction perpendicular to the axis whose protrusion dimension in the direction perpendicular to the axis is different in the circumferential direction, and the main body rubber elastic body having the compressed rubber portion and the sheared rubber portion is the same. The inner member is elastically connected to the outer member and is provided from the protrusion in the direction perpendicular to the axis toward one side in the axial direction.
The vibration isolator according to claim 1 or 2, wherein a fluid chamber having the pressure receiving chamber and the equilibrium chamber is formed on the other side in the axial direction with respect to the protrusion in the axial direction of the inner member. In the inner member and the outer member,
A pair of the facing portions are provided at positions facing each other in the direction perpendicular to the axis, and the facing portions are provided at positions facing each other.
The anti-vibration device according to any one of claims 1 to 3, wherein the pair of non-opposing portions are provided at positions facing each other in a direction perpendicular to the axis orthogonal to the axis orthogonal direction in which the pair of facing portions are located. .. One opening of the outer member is provided with a small diameter portion that expands toward the inner circumference, while
The inner member is provided with a protrusion in the direction perpendicular to the axis whose protrusion dimension in the direction perpendicular to the axis is different in the circumferential direction.
A portion having a large protrusion dimension in the protrusion in the direction perpendicular to the axis is positioned to face the small diameter portion of the outer member in the axial direction, whereby the facing portion in the axial direction between the inner member and the outer member is formed. The anti-vibration device according to any one of claims 1 to 4 . The inner member is inserted and arranged in the axial direction from one opening of the outer member, and the protrusion in the direction perpendicular to the axis of the inner member is the shaft of the outer member with respect to the small diameter portion of the outer member. It is positioned facing from the inside of the direction,
The fifth aspect of the present invention is a suspension type in which the compression rubber portion is subjected to compression deformation by being relatively displaced in a direction in which the inner member protrudes outward in the axial direction from one opening portion of the outer member. Anti-vibration device. The outer bracket is fixed to the outer member, and the outer bracket is provided with a tubular contact portion that is separated from the inner member on the outer peripheral side.
The cylindrical contact portion contacts the inner member or the inner bracket fixed to the inner member via a buffer rubber, thereby limiting the relative displacement amount between the inner member and the outer member in a buffering manner. The anti-vibration device according to any one of claims 1 to 6 , wherein the stopper mechanism is configured. The protection according to claim 7 , further comprising an annular rubber elastic body that is externally fitted to the inner member and temporarily fixed by elasticity, and at least a part of the cushioning rubber is formed by the annular rubber elastic body. Shaking device. A small-diameter protrusion that protrudes toward the inner circumference is provided at one end of the cylindrical contact portion in the axial direction.
The stopper mechanism in the direction perpendicular to the axis, which limits the amount of relative displacement of the inner member and the outer member in the direction perpendicular to the axis, has a cylindrical portion via the buffer rubber with respect to the inner member or the inner bracket. 7 . The anti-vibration device according to 8 . The ends on both sides of the tubular contact portion in the axial direction abut against the inner member or the inner bracket via the buffer rubber, so that the inner member and the outer member are axially oriented. The anti-vibration device according to any one of claims 7 to 9 , wherein the stopper mechanism in the axial direction for limiting the relative displacement amount of the above is configured.

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