JPH11101295A - Fluid-filled cylindrical anti-vibration support - Google Patents

Abstract

(57) [Summary] (Modifications) [PROBLEMS] A fluid-filled cylindrical anti-vibration support, while ensuring durability against a supporting load input in the axial direction, and a large spring in two radial directions orthogonal to each other. To achieve the ratio. An elastic partitioning member (58) for partitioning a first fluid chamber (72) and a second fluid chamber (74) is formed in a substantially cylindrical shape extending in the axial direction, while an inner peripheral side portion of a second annular rubber elastic body (18). The hollow portion 49 extends axially inward from the outer end face.
And a pair of bulges 50, 50 extending axially outward from the second fluid chamber 74 on the outer peripheral side portion of the second annular rubber elastic body so as to face each other in one radial direction. By doing so, a pair of elastic vertical wall portions 52, 52 extending in the same axial direction as the elastic partition member 58 between the hollow portion 49 and the bulge portions 50, 50 with respect to the second annular rubber elastic body 18. 52 were formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a substantially cylindrical or circular block shape as a whole, and is effective mainly for input vibration in the axial direction based on the flow action of an incompressible fluid enclosed therein. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled cylindrical vibration-damping support that exhibits a vibration-damping effect, and more particularly to a fluid-filled cylindrical vibration-damping support that can be suitably used as a member mount or a body mount in an automobile.

[0002]

2. Description of the Related Art Conventionally, as one type of a vibration-proof connecting body or a vibration-proof supporting body interposed between members constituting a vibration transmission system,
As described in Japanese Patent Publication No. Hei 2-6935, Japanese Patent Publication No. Hei 6-94889, etc., a shaft fitting and an outer cylindrical fitting arranged at a predetermined distance on an outer peripheral side thereof are firstly disposed on both axial sides. The first and second annular rubber elastic bodies are connected to each other by an annular rubber elastic body and a second annular rubber elastic body, and a substantially annular partition member separately formed is arranged between the first and second annular rubber elastic bodies. A first fluid chamber and a second fluid chamber in which an incompressible fluid such as water is sealed are formed on both axial sides of the partition member, and the two fluid chambers are mutually connected through an orifice passage. By communicating with each other, when an axial vibration is input between the shaft fitting and the outer cylinder fitting, a cylindrical vibration-absorbing effect is obtained based on a flow action such as a resonance action of a fluid caused to flow through the orifice passage. Fluid-filled anti-vibration support is known To have. Specifically, such an anti-vibration support can be applied to, for example, a vehicle body mount, a member mount, a subframe mount, a cab mount, and a suspension bush such as a strut bar cushion.

By the way, in such a fluid-filled cylindrical anti-vibration support, an axial direction and a direction perpendicular to the axis (radial direction) are used.
In some cases, different vibration damping characteristics depending on the vibration input direction may be required for the vibrations input to the device. For example, in a member mount interposed in a mounting portion of a suspension member with respect to a body main body of an automobile, vibration such as road noise input in an axial direction which is a vehicle vertical direction, and a radial direction which is a vehicle front-rear direction. In order to achieve an effective anti-vibration effect against vibrations such as harshness input in the direction and achieve a good ride comfort, the softness in the axial direction and in one radial direction corresponding to the vehicle front-rear direction While the spring characteristics are required, in order to suppress the change in the attitude of the vehicle at the time of cornering and secure the steering stability, in one radial direction corresponding to the vehicle left-right direction,
Hard spring characteristics are required, and sufficient durability of the spring characteristics is required in the vertical direction of the vehicle where the vehicle body load is input.

However, it has been difficult for the conventional vibration-damping support described in the above-mentioned publication to sufficiently achieve the required characteristics. A spring in a radial direction in which a compressive load is easily applied to the first and second annular rubber elastic bodies while sufficiently ensuring durability of a spring characteristic in an axial direction in which a shear load is easily applied to the body. There has been a problem that it is difficult to set the characteristics sufficiently soft in one of two radial directions orthogonal to each other.

[0005]

The present invention has been made in view of the above-mentioned circumstances, and a problem to be solved is to ensure sufficient durability of spring characteristics in an axial direction. In addition, a fluid having an improved structure that can set spring ratios in two radial directions perpendicular to each other to be large, and in one of the radial directions and the axial direction, both of them can advantageously realize sufficiently soft spring characteristics. It is an object of the present invention to provide an encapsulated cylindrical anti-vibration support.

[0006]

In order to solve such a problem, a feature of the present invention is that a shaft member and an outer cylinder member spaced apart on the outer peripheral side thereof are axially separated between the two members. Elastically connected by a first annular rubber elastic body and a second annular rubber elastic body interposed therebetween, and positioned between the first annular rubber elastic body and the second annular rubber elastic body. An elastic partitioning member extending continuously in the circumferential direction between the shaft member and the outer cylindrical member is disposed, and a first incompressible fluid is sealed on both sides of the elastic partitioning member. Fluid-filled cylindrical anti-vibration support in which a fluid chamber and a second fluid chamber are formed, and an orifice passage communicating the first fluid chamber and the second fluid chamber with each other is formed. The elastic partition member is fixed to the shaft member on the inner peripheral side. The portion and the fixed portion to the outer cylinder member on the outer peripheral side are displaced in the axial direction with respect to each other, so that the elastic partitioning member is provided extending in the axial direction, while one of the outer cylinder members in the axial direction is arranged. An inner flange portion bent inward in the radial direction is formed at the end portion, and at the axial end side at which the inner flange portion is formed, between the shaft member and the radially opposed surface of the outer cylindrical member. With respect to the interposed second annular rubber elastic body, an inner peripheral side portion is a hollow recess extending axially inward from an outer end surface, and an outer peripheral side portion is axially outward from the second fluid chamber. Are formed, and a pair of burrs are formed to be opposed to each other on both sides of the shaft member in one direction in the radial direction. A pair of elastic vertical wall portions extending in the axial direction is configured.

In such a fluid-filled cylindrical anti-vibration support having the structure according to the present invention, both the elastic partition member and the second annular rubber elastic body (elastic vertical wall portion)
Compressive deformation is generated when an axial load is input, and shear deformation is generated when a load is input in a radial direction in which a pair of bulges face each other. Therefore, in those elastic partition members and the second annular rubber elastic body,
In both cases, while exhibiting good durability against an axial input load, soft spring characteristics are exhibited against radial input vibration in which a pair of bulges face each other, and an excellent vibration isolation effect is exhibited. It can be done. Moreover, when a load is applied in the radial direction orthogonal to the facing direction of the pair of bulges, compressive deformation occurs in the second annular rubber elastic body interposed between the radially opposed surfaces of the shaft member and the outer cylindrical member. From being squeezed,
A sufficiently hard spring characteristic is exhibited, and as a result,
A large spring ratio can be easily set in two radial directions orthogonal to each other.

Although the specific structure of the orifice passage in the present invention is not limited at all, for example, a ring-shaped orifice member forming an orifice passage with respect to the inner or outer peripheral side of the elastic partition member. Is fixed, and the orifice member is fitted and fixed to the outer peripheral surface of the shaft member or the inner peripheral surface of the outer cylinder member. In such a structure, the orifice passage is formed by using a member for fixing the elastic partition member to the shaft member or the outer cylinder member, and has a simple structure without requiring a special member, The space for forming the orifice passage can be advantageously secured.In particular, if the orifice passage extending in the circumferential direction with respect to the orifice member is formed, the flow path length of the orifice passage can be easily secured, and further, If the orifice member is fixed to the outer peripheral side of the elastic partition member and fitted and fixed to the inner peripheral surface of the outer cylinder member, the flow path length of the orifice passage can be more advantageously secured.

The shape of the first annular rubber elastic body is not particularly limited. For example, the first annular rubber elastic body is formed in a tapered cylindrical shape, and is formed between the shaft member and the outer cylindrical member. In the above, a structure interposed in a state of extending in the same axial direction as the elastic partition member is preferably adopted. If such a structure is adopted, the first annular rubber elastic body also undergoes compressive deformation when an axial load is applied, and also undergoes shear deformation when a radial load is applied in which a pair of bulges face each other. This ensures that durability against axial input load and low dynamic spring characteristics against radial input vibration where the pair of bulges are opposed to each other can be more advantageously achieved. Become.

Furthermore, in the present invention, at the connecting portion of the shaft member by the first annular rubber elastic body, the pair is located radially opposite to each other in the radial direction orthogonal to the direction in which the pair of bulges face each other, and each is located radially outward. A pair of radial protrusions formed to protrude is preferably adopted. By providing such a radial projection, in the first annular rubber elastic body,
It is possible to increase the compressive deformation at the time of inputting the load in the axial direction to more advantageously secure the durability and to set the spring ratio in two radial directions orthogonal to each other to be large.

Further, in the present invention, at the portion of the second annular rubber elastic body where the hollow portion is formed, the hard portion protrudes radially outward from the shaft member and faces the outer cylindrical member with the hollow portion interposed therebetween. Is suitably adopted. If such a stopper member is adopted, a stopper mechanism that limits both relative displacement of the shaft member and the outer cylinder member while avoiding the high dynamic spring in the radial direction in which the pair of bulge portions face each other is excellent. It can be advantageously provided with improved space efficiency.

Further, in the present invention, (a) the shaft member and the first outer cylinder divided body which is spaced apart from the outer peripheral side of the shaft member at one end in the axial direction of the shaft member, A first integrally vulcanized molded product connected by a first annular rubber elastic body, (b) a first fixed sleeve externally fitted and fixed to the other axial end of the shaft member, and an axial direction. At one end, the second outer cylinder divided body forming the outer cylinder member by being externally fitted to and fixed to the first outer cylinder divided body is radially spaced apart from the first outer cylinder divided body. A second integral vulcanization molded product in which the fixed sleeve and the second outer cylinder divided body are connected to each other by the second annular rubber elastic body, and (c) externally fitted and fixed to the axially intermediate portion of the shaft member. The second fixed sleeve and the third fixed sleeve that is internally fitted and fixed to the first outer cylinder divided body are arranged in the radial direction. Advantageously, the structure comprises a third integrally vulcanized molded product which is arranged at a distance and the second fixed sleeve and the third fixed sleeve are connected to each other by an elastic partition member. Adopted.
If such a structure is adopted, the third integrally vulcanized molded article and the second integrally vulcanized molded article are sequentially inserted and assembled in the axial direction with respect to the first integrally vulcanized molded article. This makes it possible to manufacture the desired anti-vibration support with good workability, and to easily secure fluid tightness in the first and second fluid chambers.
In addition, for example, by assembling the third and second integrally vulcanized molded products to the first integrally vulcanized molded product in an incompressible fluid, etc. There is also an advantage that it can be quickly enclosed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, one embodiment of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 to 3 show an automobile suspension member mount 10 according to an embodiment of the present invention.
It is shown. The mount 10 includes an inner cylindrical fitting 1 as a shaft member arranged at a predetermined distance in a radial direction from each other.
2 and an outer cylinder 14 as an outer cylinder member. Both ends of the inner and outer cylinders 12 and 14 in the axial direction are elastically deformed by a first annular rubber elastic body 16 and a second annular rubber elastic body 18. Are linked together. And such a mount 10
4 shows a state in which the up-down direction in FIG. 1 is the vehicle up-down direction, and the up-down direction and the left-right direction in FIG. 2 are the front-rear direction and the left-right direction of the vehicle, as shown in FIG. Is bolted to a rod 22 erected on the body body 20, while the outer cylinder fitting 14 is press-fitted and fixed to a mounting sleeve 26 provided on the suspension member 24, whereby the body 20 of the suspension member 24 is fixed. To be interposed at the attachment site. In the mounted state of the mount 10, as shown in FIG. 4, the first and second annular rubber elastic bodies 16 are applied by applying a shared load of the body between the inner and outer cylindrical fittings 12 and 14. , 18 are elastically deformed, and the inner and outer cylindrical fittings 1
2, 14 are positioned relative to each other by a predetermined amount in the axial direction. Further, in the following description, the vertical direction refers to the vertical direction in FIG. 1 in principle.

More specifically, the inner cylindrical fitting 12 has a cylindrical shape. Also, the upper end in the axial direction of the inner cylindrical fitting 12 is
A thick portion 28 whose outer diameter is slightly increased is provided. A pair of radial portions projecting radially outward from the thick portion 28 at portions opposed to each other in the radial direction that is the vehicle lateral direction. The protrusions 30, 30 are integrally provided. Further, a first outer cylinder divided metal member 32 as a first outer cylinder divided body is coaxially arranged at a predetermined distance in the radial direction outward of the inner cylindrical metal member 12 in the radial direction. The first outer cylinder split bracket 32 has a cylindrical shape whose axial length is set to be less than half of that of the inner cylinder bracket 12, and has an outer flange portion extending radially outward at an upper end in the axial direction. 34 are integrally formed. The first outer cylinder part 32 is arranged such that its upper end in the axial direction is located below the upper end in the axial direction of the inner cylinder 12 by a predetermined amount.

A first annular rubber elastic body 16 is interposed between the inner cylinder fitting 12 and the first outer cylinder division fitting 32. The first annular rubber elastic body 16 is interposed between the thick portion 28 of the inner cylinder fitting 12 and the end of the first outer cylinder division fitting 32 on the outer flange 34 side. 1
It is formed in a tapered cylindrical shape that is inclined downward in the axial direction from 2 toward the first outer cylinder divided fitting 32 side. Thereby,
When a body load is input, the body is compressed and deformed to exhibit excellent durability. Further, a pair of outer flange portions 3 is provided on the inner peripheral side portion of the first annular rubber elastic body 16.
4 and 34 are fixed, so that a hard spring characteristic is exerted in the radial direction that is the vehicle left-right direction where the outer flange portions 34 and 34 face each other. On the other hand, the outer flange portion 34 of the first outer cylinder split fitting 32 has
A stopper rubber 36 protruding upward is provided, and as shown in FIG. 4, when mounted on a vehicle, the outer metal fitting 14 is connected to the body main body 20 via the stopper rubber 36. By being brought into contact with each other, the relative displacement amount of the outer cylinder 14 relative to the inner cylinder 12 in the axially upward direction (bound direction) is limited.

In short, the first annular rubber elastic body 16 is
The inner cylinder fitting 12 is vulcanized and adhered to the inner peripheral surface thereof, and the first outer cylinder divided fitting 32 is vulcanized and adhered to the outer peripheral surface thereof. It is formed as a first integral vulcanized molded product 37 provided with a second 32. In addition, on the inner peripheral surface of the first outer cylinder divided fitting 32,
A seal rubber layer 38 is formed over substantially the entire surface.

Further, a first metal sleeve 40 as a first fixed sleeve is externally fitted and fixed to the other end (lower end) in the axial direction of the inner cylindrical metal fitting 12. The first metal sleeve 40 has a cylindrical shape having an axial length substantially half of that of the inner cylindrical fitting 12, and has a slightly larger axial lower end, and a seal rubber on its inner peripheral surface. A layer 41 is formed, and is fitted and fixed to the inner cylindrical fitting 12 in a fluid-tight manner.

Further, a second outer cylinder divided fitting 42 as a second outer cylinder divided body is disposed radially outward of the first metal sleeve 40 at a predetermined distance and coaxially. ing. The second outer cylinder part 42 has a cylindrical shape slightly larger in diameter than the first outer cylinder part 32, and has substantially the same axial length as the inner cylinder 12. ing.
The axial lower end of the second outer cylinder split metal fitting 42 is positioned so as to protrude axially below the first metal sleeve 40, and the protruding axial lower end is caulked. An annular inner flange portion 44 protruding radially inward is integrally formed by processing or the like.

Furthermore, these first metal sleeves 40
The second annular rubber elastic body 18 is interposed between the first and second outer cylinder split fittings 42. The second annular rubber elastic body 18 has a thick cylindrical shape as a whole, and a first metal sleeve 40 is provided on an inner peripheral surface, and a second outer cylinder split fitting 42 is provided on an outer peripheral surface. It is formed as a second integrally vulcanized molded product 46 which is sulfur bonded. In addition, a thin seal rubber layer 47 is formed on the inner peripheral surface of the second outer cylinder divided fitting 42 over substantially the entire surface.

The axially upper portion of the second outer cylinder dividing metal fitting 42 is externally inserted into the first outer cylinder dividing metal fitting 32 and reduced in diameter by an octagonal drawing or the like, so that the first outer cylinder dividing metal fitting 42 is formed. Hardware 3
2 is assembled in a fluid-tight manner with the seal rubber layer 47 interposed therebetween. As a result, the first outer cylinder splitting bracket 32 and the second outer cylinder splitting bracket 42 are fixed to each other, and the outer cylinder fitting 14 having a large-diameter cylindrical shape as a whole is formed. The upper and lower sides in the axial direction of 14 are elastically connected by a first annular rubber elastic body 16 and a second annular rubber elastic body 18. In addition, a predetermined incompressible fluid is internally provided between the inner cylindrical fitting 12 and the outer cylindrical fitting 14 between the axially opposed surfaces of the first annular rubber elastic body 16 and the second annular rubber elastic body 18. A sealed fluid chamber 48 is defined with respect to the external space.

As the sealed fluid, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is preferably used. In particular, it is preferable that the vibration damping effect based on the resonance action of the fluid is effectively exerted. 0.1Pa · s
Those having the following viscosities are advantageously employed. Further, the incompressible fluid is sealed, for example, in the first integrally vulcanized molded product
7 and the second integrally vulcanized molded product 46 can be easily assembled by performing the assembly in such a fluid.

The second annular rubber elastic body 18 has an annular hollow portion extending axially upward from the lower end surface in the axial direction along the outer peripheral surface of the first metal sleeve 40 in the inner peripheral portion thereof. 49 are provided. Further, on the outer peripheral side portion of the second annular rubber elastic body 18, there are formed threading portions 50 extending axially downward from the upper end surface in the axial direction along the inner peripheral surface of the second outer cylinder member 42. A pair is formed so as to oppose each other in the radial direction that is the vehicle front-rear direction with the first metal sleeve 40 interposed therebetween over a range of less than half a turn in the direction.
And these hollow portions 49 and the bulging portions 50, 50
Radially overlapping with each other, so that the second annular rubber elastic body 18 is formed.
However, at a portion sandwiched between these hollow portions 49 and the bulging portions 50, 50, a pair of elastic vertical wall portions 5 extending substantially in the axial direction are provided.
2,52.

The elastic vertical walls 52, 52
Similarly to the first annular rubber elastic body 16, the upper part in the axial direction is connected to the inner cylindrical metal part 12 and the lower part in the axial direction is connected to the outer cylindrical metal part 14. It is shaped to extend in the axial direction. Accordingly, the elastic vertical wall portions 52, 52 are compressed and deformed when a body load is input, so that excellent durability is exhibited. In addition, the elastic vertical wall portions 52, 52 are formed in a radial direction in which the pair of burrs 50, 50 face each other. With respect to the input load described above, a sufficiently soft spring characteristic is exhibited by being subjected to shear deformation, so that the spring ratio between the radial direction in which the bulges 50 and 50 face each other and the radial direction perpendicular to the same, in other words, By doing so, the spring ratio between the vehicle front-rear direction and the vehicle left-right direction is set to be sufficiently large. In addition, the inner flange portion 44 of the second outer cylinder divided fitting 42 is fixed to the lower end portions of the elastic vertical wall portions 52, 52, so that compressive deformation when a body load is input is more advantageously generated. It is designed to be tightened.

A stopper ring 54 made of a material harder than at least the second annular rubber elastic body 18, such as a synthetic resin, is provided at a central portion in the axial direction of the first metal sleeve 40.
Are externally fitted and fixed in the second annular rubber elastic body 18. The stopper ring 54 has a pair of stopper projections 56, 56 projecting radially outward at a height that does not reach the curvature 50 in the radial direction where the pair of curvatures 50, 50 face each other. Have. The protruding distal end surfaces of these stopper projections 56, 56 are respectively opposed to the outer tube fitting 14 in the radial direction with the straight portion 50 interposed therebetween. Accordingly, when a large load is input in the radial direction corresponding to the vehicle front-rear direction in which the spring characteristic is softened, the stopper protrusion 56 abuts on the outer cylinder fitting 14 side, so that the relative position of the inner and outer cylinder fittings 12 and 14 is increased. A stopper function for limiting the amount of displacement is exerted. The stopper ring 54 is made sufficiently thin at a portion where the bulging portion 50 is not formed, so that the spring characteristic of the second annular rubber elastic body 18 is not hindered. In addition, since the stopper ring 54 is buried in the second annular rubber elastic body 18 at a portion where the bulging portion 50 is formed,
A reduction in the volume of the fluid chamber 48 when the stopper ring 54 is provided is also avoided.

Further, a stopper rubber 55 protruding outward in the axial direction is formed on the inner flange portion 44 of the second outer cylinder split fitting 42. Then, as shown in FIG. 4, the inner cylinder 1
An annular plate-shaped stopper metal fitting 53 is bolted to the lower end of the rod 22 fixed to the rod 2, and the inner flange 44 of the second outer cylinder divided metal fitting 42 is fixed to the stopper metal fitting 53. The inner flange portion 44 is opposed to the axial direction, and the inner flange portion 44 is brought into contact with the stopper metal fitting 53 via the stopper rubber 55, so that the outer cylindrical metal fitting 14 is axially below the inner cylindrical metal fitting 12 (rebound direction). The relative amount of displacement is limited.

Further, a first annular rubber elastic body 16 and a second rubber elastic body 1 are provided between the inner cylindrical fitting 12 and the outer cylindrical fitting 14.
An elastic partition rubber 58 serving as an elastic partition member is provided between the axially opposed surfaces 8 and is accommodated in the fluid chamber 48. The elastic partition rubber 58 has a substantially cylindrical shape, the upper end in the axial direction is bent inward in the radial direction, and a second metal sleeve as a second fixed sleeve is formed on the inner peripheral surface thereof. While 60 is vulcanized,
The lower end in the axial direction is bent radially outward, and a third metal sleeve 62 as a third fixing sleeve is vulcanized and bonded to the outer peripheral surface. In short, the elastic partition rubber 58 is formed by the second and third metal sleeves 60 and 62.
Is formed as a third integrally vulcanized molded product 66 having

The second metal sleeve 60 has a small-diameter cylindrical shape, and the upper portion in the axial direction has a slightly larger diameter.
A thin seal rubber layer 64 is formed on the inner peripheral surface of the large diameter portion. Then, the second metal sleeve 60
Is located between the thick portion 28 of the inner cylinder fitting 12 and the first metal sleeve 40 by being externally inserted into the inner cylinder fitting 12 and fitted and fixed in a fluid-tight manner with the seal rubber layer 64 interposed therebetween. Have been. On the other hand, the third metal sleeve 62
Along with having a large diameter cylindrical shape, both ends in the axial direction are bent outward in the radial direction, thereby exhibiting a groove-shaped cross section as a whole, opening to the outer peripheral surface and continuously extending in the circumferential direction. A peripheral groove 68 is provided. The third metal sleeve 62 is inserted into the first outer cylinder part 32 and is fitted and fixed in a fluid-tight manner with the seal rubber layer 38 interposed therebetween. Further, by this, the opening of the peripheral groove 68 is covered with the first outer cylinder splitting bracket 32, so that the first outer cylinder splitting bracket 32
An orifice passage 70 extending circumferentially between the first and third metal sleeves 62 is formed. In short, in the present embodiment, the orifice member is constituted by the third metal sleeve 62.

In this manner, the third integrally vulcanized molded product 6
6 is assembled, the fluid chamber 48 is fluid-tightly partitioned by the elastic partition rubber 58 at the axially intermediate portion, so that the space between the first annular rubber elastic body 16 and the elastic partition rubber 58 is provided. An annular first fluid chamber 72 is defined, while an annular second fluid chamber 74 is defined between the second annular rubber elastic body 18 and the elastic partition rubber 58. Further, since the orifice passage 70 is connected to the first fluid chamber 72 and the second fluid chamber 74 through the communication holes 76 and 78 provided in the third metal sleeve 62, the first fluid chamber 72 is formed. The fluid flow through the orifice passage 70 is allowed between the first fluid chamber 74 and the second fluid chamber 74.

In the suspension member mount 10 having the above-described structure, an axial vibration load in the vehicle vertical direction is applied to the space between the inner and outer cylinders 12 and 14 in the mounted state as shown in FIG. Is input, a relative pressure change is generated between the first fluid chamber 72 and the second fluid chamber 74, and a fluid flow through the orifice passage 70 is generated. Thus, the vibration damping effect based on the flow action such as the above is effectively exhibited. At this time, by appropriately adjusting the flow path length and the cross-sectional area of the orifice passage 70 and tuning to a specific vibration frequency region in question, effective vibration isolation utilizing the fluid flow action against the problematic vibration is performed. The effect can be obtained.

In addition, in any of the first and second annular rubber elastic bodies 16 and 18 and the elastic partition rubber 58 for elastically connecting the inner and outer cylindrical metal fittings 12 and 14, when the load sharing the body weight is input, the compression deformation occurs. Since it is advantageously produced and the occurrence of tensile deformation is reduced as much as possible, extremely excellent durability is exhibited.

Further, in the radial direction which is the vehicle left-right direction, effective compression deformation is generated in the second annular rubber elastic body 18 at the time of vibration input, so that a hard spring characteristic is exhibited, and an excellent elastic deformation is exhibited. Maneuvering stability will be exhibited. On the other hand, in the radial direction that is the vehicle front-rear direction, shear deformation is effectively generated in any of the first and second annular rubber elastic bodies 16 and 18 and the elastic partition rubber 58 that elastically connect the inner and outer cylindrical fittings 12 and 14. This provides a sufficiently soft spring characteristic. Therefore, it is possible to advantageously improve the vibration isolation performance against harshness and the like while maintaining the steering stability of the vehicle at a high level, and to achieve excellent ride comfort.

In particular, in the case of the cylindrical anti-vibration support having the conventional structure, it is extremely difficult to set the ratio of the radial spring constant in the vehicle longitudinal direction to the axial spring constant to be approximately 1: 1. By adopting the structure of the present embodiment, while securing the support spring rigidity in the axial direction against the body load,
It has been confirmed by the present inventors that the setting of such a spring ratio can be realized.

The embodiment of the present invention has been described in detail above. However, this is a literal example, and the present invention
The specific description of such an embodiment is not to be construed as limiting in any way.

For example, the first annular rubber elastic body 16 includes:
It is not always necessary to add a taper.
The radial projections 30, 30 in 2 need not necessarily be provided. In such a case as well, the second annular rubber elastic body 18 and the elastic partition rubber 58 having a specific shape effectively realize both durability against an axial input load and a high spring ratio in the radial direction. Can be done.

The structure and length of the orifice passage, the cross-sectional area of the passage and the like are appropriately determined according to the required vibration isolation characteristics and the like, and are not limited in any way.

In addition, the present invention provides a vibration isolation support for a differential mount, a body mount, a subframe mount, a cab mount, a strut bar cushion, etc., as well as a suspension member mount as exemplified above, and other various mechanical devices. Of course, the present invention can be applied to

In addition, although not enumerated one by one, the present invention can be embodied in modes in which various changes, modifications, improvements, and the like are made based on the knowledge of those skilled in the art. It goes without saying that all of them are included in the scope of the present invention unless departing from the spirit of the present invention.

[0039]

As is apparent from the above description, in the fluid-filled cylindrical vibration-damping support having the structure according to the present invention, each of the second annular rubber elastic members extending in the axial direction is provided. With the pair of elastic vertical wall portions and the elastic partition member, excellent durability against the supporting load input in the axial direction is exhibited, and a large spring ratio can be realized in the radial direction orthogonal to each other. Therefore, different spring characteristics can be easily and advantageously expressed in the two radial directions orthogonal to the axial direction, and can cope with different vibration isolation characteristics required in each direction in a wide range. It becomes possible.

[Brief description of the drawings]

1 is a longitudinal sectional view of an automobile suspension member mount as one embodiment of the present invention, and is a view corresponding to a II section in FIG. 2;

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a plan view of the suspension member mount shown in FIG. 1;

FIG. 4 is a longitudinal sectional view corresponding to FIG. 1, showing a state in which the suspension member mount shown in FIG. 1 is mounted on a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Suspension member mount 12 Inner cylinder fitting 14 Outer cylinder fitting 16 First annular rubber elastic body 18 Second annular rubber elastic body 49 Lightening concave part 50 Curving part 52 Elastic vertical wall part 58 Elastic partition rubber 70 Orifice passage 72 First Fluid chamber 74 second fluid chamber

Claims (6)

[Claims] 1. A first annular rubber elastic body and a second annular rubber elastic body, wherein a shaft member and an outer cylindrical member spaced apart from the outer peripheral side of the shaft member are axially separated between the two members. The elastic member is elastically connected by a body and is located between the first annular rubber elastic body and the second annular rubber elastic body and continuously extends in a circumferential direction between the shaft member and the outer cylindrical member. A partition member is provided, and a first fluid chamber and a second fluid chamber each containing an incompressible fluid are formed on both sides of the elastic partition member. In a fluid-filled cylindrical anti-vibration support having an orifice passage communicating the fluid chamber and the second fluid chamber with each other, a fixed portion of the elastic partition member on the inner peripheral side with respect to the shaft member, and an outer peripheral side Are fixed to the outer cylinder member in the axial direction. By doing so, while the elastic partition member is provided extending in the axial direction, an inner flange portion bent radially inward is formed at one axial end of the outer cylindrical member. The inner peripheral side of the second annular rubber elastic body interposed between the shaft member and the radially opposed surface of the outer cylinder member at the axial end side where the inner flange portion is formed. A hollow portion extending axially inward from the outer end face, and an outer peripheral portion extending axially outward from the second fluid chamber, and the shaft member is opposed to both sides of the shaft member in one radial direction. A pair of elastic vertical wall portions extending in the same axial direction as the elastic partition member are formed between the hollow portion and the curving portion by forming a pair of curving portions. Fluid-filled cylindrical anti-vibration support. 2. A ring-shaped orifice member forming the orifice passage is fixed to an inner peripheral side or an outer peripheral side of the elastic partition member, and the orifice member is fixed to an outer peripheral surface of the shaft member or the outer peripheral surface. The fluid-filled cylindrical anti-vibration support according to claim 1, which is fixedly fitted to an inner peripheral surface of the cylindrical member. 3. The first annular rubber elastic body has a tapered cylindrical shape, and is interposed between the shaft member and the outer cylindrical member so as to extend in the same axial direction as the elastic partition member. The fluid-filled cylindrical anti-vibration support according to claim 1. 4. A pair of a pair of first annular rubber elastic bodies which are opposed to each other in a radial direction orthogonal to a direction in which the pair of bulges are opposed to each other and project radially outward. The fluid-filled cylindrical vibration-damping support according to any one of claims 1 to 3, wherein a radial projection is formed. 5. A portion of the second annular rubber elastic body where the curving portion is formed, protrudes radially outward from the shaft member, and radially opposes the outer cylindrical member with the curling portion interposed therebetween. The fluid-filled cylindrical vibration-damping support according to any one of claims 1 to 4, further comprising a hard stopper member located at the position. 6. The first annular rubber elastic body, wherein the shaft member and a first outer cylinder divided body which is spaced apart from an outer peripheral side of the shaft member on one end side in the axial direction of the shaft member. A first integrally vulcanized molded product connected by a body, a first fixed sleeve externally fitted and fixed to the other axial end of the shaft member, and a first fixed sleeve at one axial end. The second outer cylinder divided body forming the outer cylinder member by being externally fitted and fixed to the outer cylinder divided body is radially separated from the first fixed sleeve and the second outer cylinder divided body. A second integrally vulcanized molded product in which the cylinder divided bodies are connected to each other by the second annular rubber elastic body; a second fixing sleeve externally fitted and fixed to an axially intermediate portion of the shaft member; A third fixing sleeve that is internally fitted and fixed to the first outer cylinder divided body is radially separated from the third fixing sleeve. 6. Both of the second fixed sleeve and the third fixed sleeve include a third integrally vulcanized molded product which is connected to each other by the elastic partition member. The fluid-filled cylindrical anti-vibration support according to 1.