JPS60245849A - Fluid-sealed type vibrationproof assembly body - Google Patents

Abstract

PURPOSE:To facilitate fabrication and effectively suppress the leak of the fluidic medium introduced into a liquid chamber, in a vibrationproof assembly body which develops damping effect in two directions perpendicular each other. CONSTITUTION:The first rubber elastic body 14 is attached through vulcanization between an inner cylindrical metal fitting 10 and an outer cylindrical metal fitting 12, which are arranged concentrically, and the second rubber elastic body 16 is attached through vulcanization between a flange 44 extending outside the outer cylindrical metal fitting 12 and an annular caulking metal fitting 18 positioned, keeping a prescribed distance from the flange 44. The rubber elastic body 14 has a plurality of concave parts 26, and the first chamber 26 is formed by a partitioning member 22 loaded onto the rubber elastic body 14. The partitioning member 22 is constituted of a rubber member attached through vulcanization onto an inside sleeve 60 and an outside sleeve 62, and inserted between the inner cylindrical metal fitting 10 and the outer cylindrical metal fitting 12. The upper part of the partitioning member 22 is formed into the second chamber 28. Since each chamber 26, 28 is formed from each member attached through vulcanization, fabrication is facilitated, and liquid leak can be prevented.

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 properties, and is capable of being exerted not only in the central direction but also in a direction perpendicular to the cough axis direction.

Traditionally, rubber blocks have been used as vibration-proof supports for automobile body mounts, gear mounts, suspension rods, stridor cushions, etc., 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 becomes small, so it is difficult to use such a vibration-proof support. The required characteristics could not be sufficiently achieved. 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 this demand, an elastic support body with a structure that utilizes the elasticity of rubber and the flow resistance of fluid was developed in Japanese Patent Laid-Open No.
This method has been proposed in Publication No. 5376 and the like. 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. By doing so, it was possible to achieve low dynamic spring characteristics and high damping characteristics, but due to its structure, the damping characteristics were limited to one direction, and the damping characteristics were limited to one direction, and the vibration in the direction perpendicular to that direction was However, there was a major problem in that the damping effect was insufficient.

For this reason, the applicant of the present application first filed the patent application No. 57-14564.
No. 7 (Japanese Unexamined Patent Publication No. 59-37349), they revealed a fluid-filled elastic support structure that can exhibit such damping effects in two orthogonal directions. The vibration-proof support proposed earlier has two types of fluid chambers and two types of rubber elastic bodies between the inner cylinder metal fitting and the outer cylinder metal fitting. While the elasticity of the rubber elastic body and the fluid flow resistance between the fluid chambers exert an effective damping effect, the vibrations applied from the direction perpendicular to the axis are dealt with by the elasticity of the other rubber elastic body. An effective damping effect is exerted by the fluid flow resistance between fluid chambers having different combinations of elasticity.

By the way, in order to exhibit such damping effects in different directions, it is necessary to form two types of rubber elastic bodies and two types of fluid chambers between the inner and outer cylinder fittings, respectively. In the vibration isolating support structure exemplified in the application, two divided bodies are prepared, each having a sleeve fixed to the inner and outer circumferential surfaces of a ring-shaped rubber, and these divided bodies are connected to a predetermined inner cylindrical fitting and an outer cylindrical fitting. By being press-fitted between the two divided bodies and the cylindrical metal fitting, a predetermined fluid chamber is defined between them while utilizing the elasticity of the rubber of the divided body. The press-fitting operation is not easy to assemble the vibration isolating support, and there are considerable problems inherent in the manufacturing process.

Moreover, the surfaces of the two divided bodies that are press-fitted must be polished to prevent fluid from leaking from each fluid chamber, but such polishing operations will damage the rubber applied to each divided body. It is a troublesome process along with the pre-compression operation to improve durability, and even if the surface of each divided body is precisely polished, there will be damage between the inner and outer cylinder fittings that are press-fitted. There is a risk that the fluid sealed in the fluid chamber may leak, and there is a problem that it is difficult to completely seal the fluid chamber.

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 fluid 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,
Another object of the present invention is to provide a fluid-filled vibration damping assembly that can effectively prevent leakage of the fluid medium sealed in each chamber.

In order to achieve this object, the present invention provides a first cylindrical fitting between an outer cylindrical fitting having a flange portion extending laterally at one end and an inner cylindrical fitting inserted concentrically therein. and a second cylindrical rubber elastic body are integrally vulcanized and bonded between the flange portion and an annular caulking metal fitting positioned at a predetermined distance on the outside of the flange portion. , the inner and outer peripheries of the ring-shaped rubber are attached to the mount body, which forms recessed spaces that become the first and second fluid chambers, so as to partition the recessed spaces between the inner and outer cylindrical metal fittings. A plurality of independent first fluid chambers are formed between the partition member, the inner cylindrical metal fitting, the outer cylindrical metal fitting, and the first rubber elastic body by fitting a partition member with a sleeve fixed to each surface. formed in the circumferential direction, and such that 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. and 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. and further caulking a lid member that covers an opening of the second fluid chamber to the caulking metal fitting while the first fluid chamber and the second fluid chamber are filled with a predetermined incompressible fluid. I made it fixed.

Therefore, in a fluid-filled vibration damping assembly having such a structure, the elastic action by either the first rubber elastic body or the second rubber elastic body, and the elastic action between the first fluid chamber and the second fluid chamber , or the fluid flow resistance between the plurality of first fluid chambers, an effective damping effect can be exerted against vibrations input from both the axial direction and the direction perpendicular thereto, and The first rubber elastic body and the second rubber elastic body are integrally vulcanized and adhered between the inner cylinder fitting and the outer cylinder fitting and on the outside of the flange portion of the outer cylinder fitting, respectively, to constitute a mount body, and the mount body is Since the desired plurality of first fluid chambers and second fluid chambers can be formed simply by fitting and attaching a predetermined partition member between the inner and outer cylinder metal fittings, the assembly is easy. Of course, it has become easier to operate, and even easier to manufacture.
Since the first rubber elastic body that connects the inner cylinder fitting and the outer cylinder fitting is fixed to them by vulcanization adhesive method, and does not have the press-fit structure of the divided body as described above, the first rubber elastic body connects the inner cylinder fitting and the outer cylinder fitting. Fluid leakage between the elastic body and the inner and outer cylindrical metal fittings was completely prevented, and it goes without saying that there was no need for surface polishing operations to prevent such fluid leakage. It has become.

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 which is a vibration isolation assembly according to the present invention.
The cab mount consists of an inner tube fitting 10 into which a mounting bolt is inserted to attach the cab mount between the body and the frame, an outer tube fitting 12 arranged outside the inner tube fitting 10 at a predetermined distance apart, and A rubber sleeve 14 as a first rubber elastic body vulcanized and bonded between the inner cylindrical metal fitting 10 and the outer cylindrical metal fitting 12, and a second rubber elastic body similarly vulcanized and bonded to the outer cylindrical metal fitting 12. The constituent rubber ring 16 and the caulking metal fitting 18 vulcanized and bonded to the rubber ring 16
It includes a mount body 20 having as a main element,
The mount body 20, the partition member 22 fitted between the inner cylinder fitting 10 and the outer cylinder fitting 12, and the inner cylinder fitting 10, the outer cylinder fitting 12, the rubber sleeve 14, and the rubber ring 16 form the partition member 22. a lid member 24 that covers the inner recess space, and a first chamber 26 and a second chamber 28 that are formed by partitioning the recess space with the partition member 22;
It is substantially composed of a predetermined incompressible fluid 30 filled therein.

More specifically, as shown in FIGS. 4 and 5, the mount body 20 of such a cab mount has an inner cylinder metal fitting 10 constituting the innermost cylinder in the center thereof, and The cylindrical metal fitting 10 has a stepped portion 32 on the inside of one end in the axial direction, and a seal rubber 34 is formed on the end surface of the stepped portion 32 so as to extend continuously in the circumferential direction. The outer circumferential portion of the inner cylindrical fitting 10 is a small diameter portion 36 that extends 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
It is configured to be connected to a step with a stepped portion, and
A circumferential groove 40 with a predetermined width 2 is provided 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.

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 flange portion 42 that further extends laterally at a symmetrical position. A bracket portion 44 is formed, and a bolt hole 46 for mounting is provided therethrough.

There is a space between the inner tube fitting 10 and the outer tube fitting 12 between the end of the outer tube fitting 12 on the side opposite to the side where the flange portion 42 is formed and the large diameter portion 38 of the inner tube fitting 10. A predetermined rubber sleeve 14 is integrally vulcanized and bonded. This rubber sleeve 14 has a plurality of recesses 4 of a predetermined depth capable of forming a plurality of first chambers 26 on its inner end surface.
8, and an arcuate fitting groove 50 connecting the recesses 48. In addition, this rubber sleeve 1
To improve the durability of the adhesive surface of 4, the outer cylinder metal fitting 1
2 is subjected to drawing processing using a helical drawing method, etc.
A predetermined amount of 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 cylindrical metal fitting 12 by an integral vulcanization adhesive method. A ring-shaped caulking fitting 18 with an L-shaped cross section is fixed to the end face by vulcanization adhesive. In addition,
A restraint ring 52 is embedded in the outer periphery of the rubber ring 16 to prevent the rubber ring 16 from deforming outward. Further, a seal rubber 54 is fixed and disposed in an annular shape along the inner peripheral edge of the caulking fitting 18.

The mount main body 20 having such a configuration includes an inner tube fitting 10, an outer tube fitting 12, a caulking fitting 18, and a restraining ring 5.
2, the rubber sleeve 14 and the rubber ring 16 are integrally vulcanized and molded. It can be suitably formed by vulcanization bonding and integration, and at the same time during such vulcanization molding, the seal rubber 5
4 will also be formed. Moreover, in the mount main body 20 having such a structure, the inner tube fitting 10 and the outer tube fitting 1 are
2. The rubber sleeve 14 and the rubber ring 16 form a recessed space 56 that becomes the first chamber 26 and the second chamber 28.

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. It is fixed in place and has a one-piece structure.

The rubber member 58 includes the aforementioned rubber sleeve 14'.
An arc-shaped fitting protrusion 64 that can be fitted into the arc-shaped fitting groove 50 provided in the inner sleeve 60 is provided at both ends of the inner sleeve 60 in the axial direction. As if
Communication cutouts 66,68 are provided. ' 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 the components shown in FIGS. For the mount body 20 shown in the figure, water,
6 and 7 in an incompressible fluid 30 such as polyalkylene glycol, silicone oil or low molecular weight polymer.
The partition member 22 shown in the figure is press-fitted so that its fitting protrusion 64 fits into the fitting groove 50 of the rubber sleeve 14. By this press-fitting operation, a plurality of chambers 2
6 is a partition member 22, an inner cylinder fitting 10, an outer cylinder fitting 12,
It will be formed in the circumferential direction between it and the rubber sleeve 14. Further, the press-fitted partition member 22 has an inner sleeve 60 that is connected to a circumferential groove provided in the inner cylinder fitting 60.
0. The incompressible fluid 30 comes to be filled in each of the plurality of (two in this case) No. 26, 26 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 part, the cylindrical part 72 provided on the disc-shaped lid member 24 is fitted and set into the stepped part 32 formed inside the end of the inner cylindrical fitting 10. By caulking and fixing the peripheral edge portion with the caulking metal fitting 18, the assembly operation is completed and the desired cab mount is formed. In other words, the second chamber 2 is formed between the partition member 22, the inner cylindrical fitting 10, the outer cylindrical fitting 12, and the rubber ring 16.
The opening at the caulking metal odor 18 portion of No. 8 is covered with a lid member 24, and it covers the end face of the inner cylinder fitting 10 (seal rubber 34 portion) and the caulking metal fitting 18 (seal rubber 5).
The second chamber 28 is made liquid-tight by being firmly abutted and pressed by the second chamber 28 (part 4).

Further, 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 -th chamber 26 is
They are communicated with the second chamber 28 via the circumferential groove 40, and a plurality of (here, two) second chambers 28 are connected to each other through the circumferential groove 40.
6 are communicated with each other via the circumferential groove 40.

Therefore, in the cab mount having such a configuration, when vibration as a load W is applied in the axial direction, the incompressible fluid 30 flows from the second chamber 28 side to the
6 side through the communication notch 68, the circumferential groove 40, and the communication notch 66, and in the axial direction as in the case where a load W as shown by the arrow in FIG. 10 is applied. When a vibration is applied in a direction perpendicular to this, the first chamber 26 on the side to which the load is applied is deformed, and the incompressible fluid 30 filled therein is transferred to the communication notch 66, the circumferential groove 40, It moves to the other chamber 26 via 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 provides an effective vibration damping effect. can be demonstrated.

Furthermore, 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, thereby exerting an effective damping effect as a whole. It can be demonstrated.

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 metal fitting. 10. It is formed as a mount body 20 which is vulcanized and bonded to the outer cylinder metal fitting 12, and two types of fluid chambers, that is, a first chamber 26 and a second chamber 28 are formed by simply press-fitting the partition member 20 into this. As a result, the assembly work could be significantly simplified and facilitated, and the manufacturing process could also be carried out advantageously. Moreover, unlike the case where the first chamber and the second chamber are formed by press-fitting, 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.
Because it is vulcanized and bonded to the inner surface of
There is no possibility that the incompressible fluid 30 leaks to the outside through the space between them, and therefore, the problem of fluid leakage, which was a problem in the press-fit structure, can be completely solved.

Furthermore, since the rubber sleeve 14 for forming the second chamber 26 is not interposed between the inner cylindrical fitting 10 and the outer cylindrical fitting 12 in a press-fit structure,
There is no longer any need for a surface polishing operation to enhance the sealing effect, and it is now necessary to strictly control the extent of these individual treatments in combination with the pre-compression operation and surface polishing operation for such rubber sleeves. There was no longer any need for it. In 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. is possible.

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 attached only to 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 structure is such that the first chamber 26, the second chamber 28, and the plurality of second chambers 26, 26 are simultaneously communicated with each other via the circumferential groove 40.
It is also possible to provide communication between the second chamber 28 and the plurality of second chambers 26 and 26 separately, and the communication circumferential groove 40 is not only provided in the inner cylindrical fitting 10, but also in the case where it is provided in the outer cylindrical fitting 10. It is also possible to provide it on the cylindrical metal fitting 12 side. Furthermore, in the above example, two of the plurality of chambers 26, 26 provided around the inner cylindrical fitting 10 are provided with a phase difference of about 180 degrees, but three or more chambers 26,26 are provided with a phase difference of about 180 degrees. Of course, it is also possible to form it 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 sectional view taken along the line ■-■ in FIG. 1, and FIG. m in
-m sectional view. Figures 4 to 8 are numbers 1 to 8, respectively.
3 shows the components of the cab mount, FIG. 4 is a plan view of the mount body, FIG. 5 is a sectional view taken along line V-V in FIG. 4, and FIG. 6 is a view of the partition member. The plan view, Figure 7 is the ■-■ sectional view in Figure 6, and Figure 8
The figure is a perspective view of an inner sleeve used in the partition member. Fig. 9 is a half-turn cross section 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 section perpendicular 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; 10: Inner cylinder metal fitting 12: Outer cylinder metal fitting 14: Rubber sleeve 16: Rubber ring 18: Caulking metal fitting 20: Mount metal fitting 22: Partition member 24: Lid member 26: First chamber 28: Second chamber 30: Incompressible fluid 34: Seal rubber 40: Circumferential groove 4
2: 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 : Communication notch 70 Ni spacer 72: Cylindrical part - Applicant Tokai Rubber Industries Co., Ltd.

Claims (5)

[Claims] (1) A first rubber elastic body is placed between an outer cylindrical metal fitting having a flange portion extending laterally at one end and an inner cylindrical metal fitting inserted and arranged concentrically with the outer cylindrical metal fitting, and between the flange portion and the outside thereof. A second cylindrical rubber elastic body is integrally vulcanized and bonded between the annular caulking fittings positioned at a predetermined distance from each other, thereby forming recessed spaces that will become the first and second fluid chambers. A partition member formed by fixing sleeves to the inner and outer peripheral surfaces of the ring-shaped rubber is inserted into the formed mount body so as to partition the recessed space between the inner and outer cylindrical metal fittings. a plurality of independent first fluid chambers are formed in the circumferential direction between the partition member, the inner cylinder metal fitting, the outer cylinder metal fitting, and the first rubber elastic body; The caulking metal part is opened between the partition member, the inner cylinder metal fitting, the outer cylinder metal fitting, and the second rubber elastic body, and the plurality of first fluid chambers are connected to each other. forming a communication mechanism including lateral communication means for communicating with the plurality of first fluid chambers and axial communication means for communicating with the plurality of first fluid chambers and the second fluid chamber; A fluid-filled vibration damping assembly characterized in that a lid member that covers an opening of the second fluid chamber is fixed to the caulking fitting by caulking in a state where the second fluid chamber is filled with a predetermined incompressible fluid. Three-dimensional. (2) The communication mechanism connects a continuous circumferential groove formed at the partition member fitting position on the outer circumferential surface of the inner cylindrical fitting with each of the first fluid chambers. A first communication portion, and a second communication portion that communicates the communication circumferential groove with the second fluid chamber, through which the communication circumferential groove connects all of the first and second fluid chambers. 2. A vibration isolation assembly as claimed in claim 1, wherein all of the vibration isolation assemblies are in communication with each other at the same time. (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 outer cylindrical metal fitting of the mount main body is subjected to a drawing process so that preliminary compression is applied to the first rubber elastic body. Anti-vibration assembly. (5) A patent claim in which the lid member has a cylindrical portion 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 portion is fitted. The vibration isolation assembly according to any one of items 1 to 4.