JPH026935B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid-filled vibration isolating assembly that can exhibit damping characteristics that are particularly effective against both low-frequency vibrations and high-frequency vibrations; The present invention relates to a fluid-filled vibration damping assembly that is easy to assemble and manufacture, and has excellent sealing performance, and is capable of performing both in the axial direction as well as in the direction perpendicular to the axial direction.

Conventionally, vibration-proof supports such as automobile body mounts, cab mounts, suspension rods, and strut bar cushions have been used with a structure in which a rubber block is interposed between two mounting brackets. However, when rubber with a low dynamic spring constant is used to reduce vibration noise in the high frequency range, the loss coefficient of the rubber is small, so the damping coefficient is small, which is why such vibration isolating supports are required. The characteristics could not be fully satisfied. However, such a vibration-proof support is required to have high damping characteristics to reduce vibration in the low frequency range and low dynamic spring characteristics to reduce noise in the high frequency range. be.

On the other hand, in order to meet such demands, an elastic support body having a structure that utilizes the elasticity of rubber and the flow resistance of fluid has been proposed in Japanese Patent Laid-Open No. 5376/1983. This fluid-filled elastic support has damping properties due to the damping effect due to the elasticity of the rubber as well as the flow resistance effect caused by the fluid passing through the small hole that connects the two separately formed spaces. With this, low dynamic spring characteristics and high damping characteristics were achieved, but due to its structure, the damping characteristics were limited to one direction, and vibrations occurred in a direction perpendicular to that direction. However, there was a major problem in that the damping effect was insufficient.

For this reason, the applicant of this application first filed a patent application filed in 1983-
In No. 145647 (Japanese Unexamined Patent Publication No. 59-37349), he disclosed a fluid-filled elastic support structure that can exhibit such damping effects in two orthogonal directions. As shown in FIGS. 11 and 12, the vibration-proof support proposed above has two types of fluid chambers 118 and 1 between an inner cylindrical metal fitting 110 and an outer cylindrical metal fitting 112.
20 and two types of rubber elastic bodies 114 and 116 are respectively provided, and vibrations in the axial direction are effectively suppressed by the elasticity of one of the rubber elastic bodies 114 and the resistance of fluid flow between the fluid chambers. On the other hand, the elasticity of the other rubber elastic body 116 and the fluid flow resistance between the fluid chambers of different combinations are effective against vibrations applied from a direction perpendicular to the axis. It is designed to exert a damping effect.

By the way, in order to exhibit such damping effects in different directions, two types of rubber elastic bodies 1
14, 116 and two types of fluid chambers 118, 120 must be formed between the inner cylindrical fitting 110 and the outer cylindrical fitting 112, respectively. By preparing two divided bodies 116a and 116b, each having a sleeve fixed to the inner and outer peripheral surfaces of a ring-shaped rubber, and press-fitting these divided bodies between a predetermined inner cylindrical fitting 110 and outer cylindrical fitting 112. , the divided body 116
A predetermined fluid chamber 120 is formed between the two divided bodies 116a and 116b by utilizing the elasticity of the rubber of the divided bodies 116a and 116b.
The press-fitting operation of 116b is not easy when assembling the vibration isolating support, and there are considerable problems inherent in its manufacturing work.

Moreover, the two divided bodies 116a that are press-fitted,
The outer circumferential surface of 116b needs to be polished to prevent fluid leakage from each fluid chamber 118, 120, but such a polishing operation improves the durability of the rubber added to each segment. In addition, even if the outer circumferential surfaces of each of the divided bodies 116a and 116b are precisely polished, the inner cylinder fitting 1 to be press-fitted is troublesome.
10 and the outer cylindrical fitting 112, there is a risk that the fluid sealed in each fluid chamber may leak, and there is an inherent problem that it is difficult to completely seal the fluid.

The present invention has been made against this background, and its purpose is to improve low dynamic spring characteristics and high damping by utilizing the flow resistance of a fluidizing medium between two chambers. In a vibration-proof support that exhibits both characteristics and can exhibit such performance in two orthogonal directions, it is easy to assemble and manufacture, and it also prevents leakage of the fluid medium sealed in each chamber. An object of the present invention is to provide a fluid-filled vibration isolating assembly that can effectively prevent vibrations.

In order to achieve this object, the present invention provides a first cylindrical metal fitting between an outer cylindrical metal fitting having a flange portion extending laterally at one end and an inner cylindrical metal fitting concentrically inserted therein. and a second cylindrical rubber elastic body are integrally vulcanized and bonded between the flange portion and an annular caulking fitting positioned at a predetermined distance on the outside of the flange portion. For the mount body formed by forming a recessed space between the outer cylindrical fitting, the second rubber elastic body, and the inner cylindrical fitting, the recessed space is partitioned between the inner cylindrical fitting and the outer cylindrical fitting. A partition member formed by fixing sleeves to the inner and outer circumferential surfaces of the ring-shaped rubber is fitted, and a plurality of partition members are formed between the partition member, the inner cylinder metal fitting, the outer cylinder metal fitting, and the first rubber elastic body. An independent first fluid chamber is formed in the circumferential direction, and the partition member, the inner cylindrical metal fitting, the outer cylindrical metal fitting, and the second rubber elastic body are connected to each other with the second fluid chamber opened at the caulked metal fitting portion. lateral communication means formed between the plurality of first fluid chambers and allowing the plurality of first fluid chambers to communicate with each other; and an axial direction communicating means between the plurality of first fluid chambers and the second fluid chamber. forming a communication mechanism including a communication means, and further covering an opening of the second fluid chamber in a state in which the first fluid chamber and the second fluid chamber are filled with a predetermined incompressible fluid; The lid member is fixed to the caulking metal fitting by caulking.

Therefore, in a fluid-filled vibration damping assembly having such a structure, the elastic action of either the first rubber elastic body or the second rubber elastic body, and the first fluid chamber and the second fluid chamber Due to the fluid flow resistance between the first fluid chambers or between the first fluid chambers, an effective damping effect can be exerted against vibrations input from both the axial direction and the direction perpendicular to the axial direction. At the same time, the first rubber elastic body and the second rubber elastic body are integrally vulcanized and bonded between the inner cylinder metal fitting and the outer cylinder metal fitting and on the outside of the flange portion of the outer cylinder metal fitting, respectively, to constitute a mount body, and the mount main body is configured. Since a plurality of desired first fluid chambers and second fluid chambers can be formed simply by fitting and attaching a predetermined partition member between the inner cylinder metal fitting and the outer cylinder metal fitting of the main body, the assembly is easy. Not only has the attachment operation and production become easier, but the first rubber elastic body that connects the inner and outer metal fittings is fixed to them using a vulcanization adhesive method, making it possible to create a split body as described above. Since the structure was not press-fitted, fluid leakage between the first rubber elastic body and the inner and outer cylinder fittings could be completely prevented; There is no longer any need for surface polishing operations to prevent fluid leakage.

Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail based on the drawings.

First, FIGS. 1 to 3 show an example of a fluid-filled cab mount that is a vibration isolation assembly according to the present invention, in which the cab mount is attached between a body and a frame. Inner cylindrical metal fitting 10 into which a mounting bolt is inserted
, an outer cylindrical fitting 12 arranged at a predetermined distance on the outside thereof, an inner cylindrical fitting 10 and an outer cylindrical fitting 1.
2, a rubber ring 16 constituting a second rubber elastic body similarly vulcanized and bonded to the outer cylinder fitting 12; A mount body 20 having a caulking metal fitting 18 vulcanized and bonded to a rubber ring 16
The mount main body 20, the partition member 22 fitted between the inner cylinder fitting 10 and the outer cylinder fitting 12, and the inner cylinder fittings 1
0, a lid member 24 that covers the inner recessed space formed by the outer cylinder fitting 12, the rubber sleeve 14, and the rubber ring 16; and the partition member 22 that covers the recessed space.
The first chamber 2 is formed by partitioning the
6 and a predetermined incompressible fluid 30 filled in the second chamber 28.

More specifically, as shown in FIGS. 4 and 5, the mount body 20 of such a cab mount has an inner cylinder metal fitting 1 constituting the innermost cylinder in its center.
0, and this inner cylindrical fitting 10 has a stepped portion 32 on the inside of one end in the axial direction, and is fixed to the end surface so as to extend continuously in the circumferential direction. A seal rubber 34 is formed. The outer circumferential portion of the inner cylindrical fitting 10 has a small diameter portion 36 extending in the axial direction over a predetermined length from the end on the side where the seal rubber 34 is provided, and the remaining large diameter portion 38 has a stepped portion. In addition, a circumferential groove 40 with a predetermined width l is formed in a portion of the small diameter portion 36 adjacent to the large diameter portion 38, in other words, in a substantially central portion of the inner cylinder fitting 10 in the axial direction. It is provided.

Further, the outer cylinder fitting 12 is provided with a flange portion 42 extending laterally at one end in the axial direction, and the flange portion 42 is provided with a mounting member extending further laterally at a symmetrical position. A bracket portion 44 is formed with mounting bolt holes 46 extending therethrough.

Between the inner tube fitting 10 and the outer tube fitting 12, there is an end portion of the outer tube fitting 12 opposite to the side where the flange portion 42 is formed, and a large diameter portion 38 of the inner tube fitting 10.
A predetermined rubber sleeve 14 is integrally vulcanized and bonded between the two. This rubber sleeve 14 has a plurality of recesses 48 of a predetermined depth that can form a plurality of first chambers 26 on its inner end surface, and an arcuate fitting groove 50 that connects the recesses 48. have. In order to improve the durability of the adhesive surface of the rubber sleeve 14, the outer cylinder fitting 12 is subjected to a drawing process using an eight-way drawing method or the like, and a predetermined pre-compression is applied. .

Further, a cylindrical rubber ring 16 of a predetermined thickness is fixed concentrically to the outer surface of the end flange portion 42 of the outer cylinder fitting 12 by an integral vulcanization adhesive method, and the rubber ring A ring-shaped caulking metal fitting 18 having an L-shaped cross section is fixed to the end face of 16 by vulcanization adhesive. Note that a restraint ring 52 is embedded in the outer peripheral portion of the rubber ring 16 to prevent the rubber ring 16 from deforming outward. In addition, caulking metal fittings 1
A sealing rubber 54 is fixed and disposed in an annular shape along the inner peripheral edge of the housing 8 .

Then, the mount body 20 having such a configuration
Inner cylinder metal fitting 10, outer cylinder metal fitting 12, caulking metal fitting 1
8. In the presence of the restraining ring 52, the rubber sleeve 14 and the rubber ring 16 can be suitably formed by integrally vulcanizing and bonding them together, and such The seal rubber 54 is also formed at the same time as the vulcanization molding. In addition, in the mount main body 20 having such a structure, the recessed space 56 that becomes the first chamber 26 and the second chamber 28 is formed by the inner tube fitting 10, the outer tube fitting 12, the rubber sleeve 14, and the rubber ring 16. It will be formed.

On the other hand, as shown in FIGS. 6 and 7, the partition member 22 has metal sleeves, that is, an inner sleeve 60 and an outer sleeve 62, attached to the inner and outer circumferential surfaces of an annular rubber member 58, respectively, by vulcanization bonding, etc. are fixed together to form an integral structure.
The rubber member 58 is provided with an arc-shaped fitting protrusion 64 that can be fitted into the arc-shaped fitting groove 50 provided in the rubber sleeve 14, and is also provided with an arc-shaped fitting protrusion 64 that can fit into the arc-shaped fitting groove 50 provided in the rubber sleeve 14. Communication cutouts 66, 68 are provided at both ends, as clearly shown in FIG.

When assembling the cab mount according to the present invention as shown in FIGS. 1 to 3 using the components shown in FIGS. 4 to 8, first refer to FIGS. 4 and 5. The partition member 22 shown in FIGS. 6 and 7 is attached to the shown mount body 20 in an incompressible fluid 30 such as water, polyalkylene glycol, silicone oil, or a low molecular weight polymer. The protrusion 64 is press-fitted into the fitting groove 50 of the rubber sleeve 14 . By this press-fitting operation, the plurality of first chambers 26 are separated from the partition member 22 and the inner cylinder fitting 1.
0, it is formed in the circumferential direction between the outer cylinder metal fitting 12 and the rubber sleeve 14. Further, the press-fitted partition member 22 is arranged such that its inner sleeve 60 is positioned above the circumferential groove 40 provided in the inner cylinder fitting 60. Incompressible fluid 30 comes to be filled in each of the plurality of (two in this case) first chambers 26, 26 formed in this way.

Next, a cylindrical spacer 70 is fitted into the small diameter portion 36 of the inner cylindrical fitting 10 of the mount main body 22 into which the partition member 22 has been press-fitted, and the partition member 22 is inserted into the step on the outer peripheral surface of the inner cylindrical fitting 10. After fixing the position by pressing against the attached portion, the cylindrical portion 7 provided on the disc-shaped lid member 24 is
2 into the stepped part 32 formed inside the end of the inner cylindrical metal fitting 10, and the peripheral edge thereof is caulked and fixed with the caulking metal fitting 18, the assembly operation is completed and the purpose is achieved. A cab mount is formed. That is, the opening in the caulking metal fitting 18 portion of the second chamber 28 formed between the partition member 22, the inner cylinder fitting 10, the outer cylinder fitting 12, and the rubber ring 16 is covered with the lid member 24, and is the end face of the inner cylinder fitting 10 (seal rubber 3
4) and the caulking fitting 18 (sealing rubber 54), the second chamber 28 is made liquid-tight.

Moreover, the plurality of first chambers 26 and second chambers 28 formed in this way are arranged in the inner sleeve 60 of the partition member 22, respectively, with respect to the circumferential groove 40 formed in the outer peripheral surface of the inner cylinder fitting 10. They are communicated with each other by cutouts 66 and 68 provided at both ends. Therefore, the first chamber 26 is communicated with the second chamber 28 via the circumferential groove 40, and a plurality of (here, two) first chambers 26 are connected to each other through the circumferential groove 40.
6 are communicated with each other via the circumferential groove 40.

Therefore, when a cab mount having such a configuration is subjected to vibration as a load W in the axial direction, the incompressible fluid 30 flows from the second chamber 28 side to the first chamber 26 side as shown in FIG. , communication notch 6
8. Vibration in a direction perpendicular to the axial direction, as in the case where the movement occurs through the circumferential groove 40 and the communication notch 66, and when a load W as shown by the arrow in FIG. 10 is applied. When a load is applied, the first chamber 26 on the side to which the load is applied is deformed, and the incompressible fluid 30 filled therein flows through the communication notch 6.
6, it moves to the other first chamber 26 via the circumferential groove 40 and the communication notch 66. In short, a predetermined flow resistance is developed in the incompressible fluid 30 flowing between each chamber in response to a vibration load in any direction, and this flow resistance allows effective vibration A damping effect can be exerted. Moreover, the vibration damping effect in these two directions is further enhanced by the fact that each rubber part and each chamber attenuate their respective component forces, resulting in an effective damping effect as a whole for vibrations from those combined directions. It is possible to demonstrate this.

In the cab mount as a fluid-filled vibration isolating assembly having such characteristics, the rubber sleeve 14 and the rubber ring 16, which are the first rubber elastic body and the second rubber elastic body, are attached to the inner cylinder fitting 1.
0, is formed as a mount body 20 having a structure vulcanized and bonded to the outer cylinder metal fitting 12, and a partition member 2 is attached to this.
Since two types of fluid chambers, that is, the first chamber 26 and the second chamber 28, can be formed by simply press-fitting the 0, the assembly work can be significantly simplified and facilitated. It also became possible to manufacture them advantageously. Moreover, unlike the case where the first chamber and the second chamber are formed by press-fitting conventional rubber division bodies, the rubber sleeve 14 forming the first chamber 26 is formed between the outer surface of the inner tube fitting 10 and the outer tube fitting 12. Since the incompressible fluid 30 is vulcanized and bonded to the inner surface of the rubber partition, there is no possibility that the incompressible fluid 30 leaks to the outside through the space between them. The problem of fluid leaking to the outside from the press-fitted portion of the divided body can now be completely resolved.

Furthermore, since the rubber sleeve 14 for forming the first chamber 26 is not interposed between the inner cylindrical fitting 10 and the outer cylindrical fitting 12 due to the press-fit structure, the sealing effect is enhanced. There is no longer any need for surface polishing operations for
Furthermore, in the combination of the pre-compression operation and the surface polishing operation on such a rubber sleeve, there is no need to strictly control the degree of each of these processes. In the case of the vibration isolating assembly as in the above example, by drawing the outer cylindrical metal fitting 12, sufficient pre-compression can be applied to the rubber sleeve 14, thereby improving its durability. It is possible to improve the

Although various examples of the vibration isolation assembly according to the present invention have been described above, the present invention is not to be construed as being limited to only such examples, and as long as it does not depart from the spirit of the present invention, It goes without saying that various changes, modifications, improvements, etc. can be made to the present invention.

For example, in the previous example, the first chamber 26, the second chamber 28, and the plurality of first chambers 26, 26 are connected by a circumferential groove 4.
Although the structure is such that the first chamber 26 and the second chamber 28 communicate with each other at the same time via the first chamber 26 and the second chamber 28, it is also possible to communicate with each other separately. Furthermore, the communication circumferential groove 40 can be provided not only on the inner cylindrical fitting 10 but also on the outer cylindrical fitting 12 side. Furthermore, in the above example, two of the plurality of first chambers 26, 26 provided around the inner cylindrical fitting 10 are provided with a phase difference of approximately 180 degrees, but three or more Of course, it is also possible to form one chamber in the circumferential direction.

Furthermore, the present invention can be applied not only to the cab mount as described above, but also to other anti-vibration supports such as body mounts and member mounts.

[Brief explanation of drawings]

FIG. 1 is a plan view of a cab mount according to an example of the fluid-filled vibration isolation assembly according to the present invention, FIG. 2 is a cross-sectional view taken in FIG.
The figure is a - sectional view in FIG. 2. Figures 4 to 8 show the components of the cab mount shown in Figures 1 to 3, respectively.
5 is a plan view of the mount body, FIG. 5 is a cross-sectional view of the partition member in FIG. 4, FIG. 6 is a plan view of the partition member, FIG. 7 is a cross-sectional view of the partition member in FIG. FIG. 3 is a perspective view of an inner sleeve used in the component. Fig. 9 is a cross-sectional half view corresponding to Fig. 2 for explaining the flow of incompressible fluid when vibration is applied in the axial direction, and Fig. 10 is a cross-sectional half view at right angles to the axial direction. FIG. 4 is a diagram corresponding to FIG. 3 for explaining the flow of incompressible fluid when vibrations in different directions are applied; Also, the first
FIG. 1 is a sectional view corresponding to FIG. 2, showing an example of a fluid-filled vibration damping support with a conventional rubber segment press-fit structure, and FIG. 12 is a cross-sectional view taken from XII-XII in FIG.
FIG. 10: Inner cylinder metal fitting, 12: Outer cylinder metal fitting, 14: Rubber sleeve, 16: Rubber ring, 18: Caulking metal fitting, 20: Mounting metal fitting, 22: Partition member, 2
4: Lid member, 26: First chamber, 28: Second chamber, 3
0: Incompressible fluid, 34: Seal rubber, 40: Circumferential groove, 42: Flange portion, 44: Mounting bracket portion, 48: Recess, 50: Fitting groove, 52: Restriction ring, 54: Seal rubber, 56: Recess Space, 58:
Rubber member, 60: inner sleeve, 62: outer sleeve, 64: fitting convex portion, 66, 68: communicating notch, 70: spacer, 72: cylindrical portion.

Claims (1)

[Scope of Claims] 1. A first rubber elastic body is provided between an outer cylindrical metal fitting having a laterally extending flange portion at one end and an inner cylindrical metal fitting inserted and arranged concentrically thereto; A cylindrical second rubber elastic body is integrally vulcanized and bonded between the outer cylindrical member and an annular caulking metal fitting positioned at a predetermined distance on the outside thereof, and the outer cylindrical metal fitting and the second rubber For a mount body formed by forming a recessed space between an elastic body and an inner cylindrical metal fitting, the inner and outer circumferential surfaces of a ring-shaped rubber are arranged so as to partition the recessed space between the inner cylindrical metal fitting and the outer cylindrical metal fitting. A plurality of independent first fluid chambers are formed in the circumferential direction between the partition members, the inner cylindrical metal fitting, the outer cylindrical metal fitting, and the first rubber elastic body by fitting and inserting partition members each having a sleeve fixed thereto. and a second fluid chamber is formed between the partition member, the inner cylindrical metal fitting, the outer cylindrical metal fitting, and the second rubber elastic body with the second fluid chamber opened at the caulked metal fitting portion. forming a communication mechanism including lateral communication means for communicating the plurality of first fluid chambers with each other and axial communication means for communicating the plurality of first fluid chambers and the second fluid chamber, Further, a lid member that covers the opening of the second fluid chamber is crimped and fixed to the crimped fitting while the first fluid chamber and the second fluid chamber are filled with a predetermined incompressible fluid. A fluid-filled vibration isolation assembly characterized by: 2. The communication mechanism includes a communication circumferential groove formed at the partition member fitting position on the outer circumferential surface of the inner cylinder fitting;
a first communication portion that communicates between the communication circumferential groove and each of the first fluid chambers, and a second communication portion that causes the communication circumferential groove and the second fluid chamber to communicate with each other; 2. The vibration isolation assembly according to claim 1, wherein all of the first and second fluid chambers are communicated with each other at the same time via the communication circumferential groove. 3. The first rubber elastic body has a plurality of recesses on the surface on the side where the recess space is formed, and the recesses are covered by fitting the partition member, so that the plurality of first rubber elastic bodies have a plurality of recesses. 3. The vibration isolation assembly according to claim 1, wherein the fluid chambers are formed independently from each other. 4. The vibration isolator according to any one of claims 1 to 3, wherein the outer cylindrical metal fitting of the mount body is subjected to a drawing process so that preliminary compression is applied to the first rubber elastic body. assembly. 5. Claims in which the lid member has a cylindrical part that is fitted into the end of the inner cylindrical metal fitting, and the peripheral edge of the lid member is fixed by caulking with the caulking metal fitting when the cylindrical part is fitted. The vibration isolation assembly according to any one of items 1 to 4.