JPS60201136A - Vibro-isolating supporter filled with fluid - Google Patents

Abstract

PURPOSE:To enable a vibro-isolating supporter in a good condition to damp the vibration in a low frequency range while isolate the vibration in a high frequency range further increase also the rigidity in a direction at a right angle with the direction of the axial center of the supporter. CONSTITUTION:A circular annular rubber block 10, used as a rubber elastic member consisting of a rubber material of low dynamic spring constant, fixes a mounting metal fixture 12, for mounting the rubber block to a car body, at a right angle with the direction of the axial center in its central part of the rubber block 10. The rubber block 10 provides in its both side parts in the direction of the axial center, divided by this mounting metal fixture 12, respectively a plurality of first pocket part 14 and second pocket parts 16 under a condition such that they are opened to end surfaces respectively in the direction of the axial center and closed by coating-cover metal fixtures 18, 20. The rubber block 10 arranges a penetrating hole 32 used as the first orifice means allowing non-compressible fluid 28 to circulatively flow between the both pocket parts 14, 16 while a groove 34 used as the second orifice means connecting the plurality of the second pocket parts 16 to each other.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a vibration isolating support used in automobiles, etc., and in particular to a vibration isolating support that is mounted on a predetermined number of axes and that satisfactorily damps low frequency vibrations in the axial direction. The present invention also relates to a fluid-filled vibration-proof support that effectively prevents transmission of high-frequency vibrations.

Prior Art A vibration isolating support used in suspensions of vehicles such as automobiles, which is attached to a predetermined shaft and is designed to attenuate or block vibrations primarily in the axial direction. There is. For example, car body mount or cab mount.

Another example is a vibration-proof support used for member mounts, strut bar cushions, etc.

By the way, in such vibration-proof supports, the rubber elastic body has conventionally been used alone or has been made of synthetic resin.

It was used in a composite structure with canvas, etc., and vibration damping or isolation was attempted based on the elastic force of the rubber elastic body. It was difficult to satisfy both the vibration isolation ability in the high frequency range. If you try to obtain good vibration isolation ability in the high frequency range by using rubber with a low dynamic spring constant as the rubber elastic body, the vibrations in the low frequency range will not be sufficiently damped, and on the contrary, if you use rubber with a high dynamic spring constant, If an attempt was made to effectively damp vibrations in a low frequency range, there was a problem in that the ability to block vibrations in a high frequency range deteriorated.

Therefore, the applicants of this application first applied for Utility Application No. 58-16364.
In No. 9, the elasticity of rubber is used to effectively block vibrations in the high frequency range, while the flow resistance of the fluid is used to effectively damp vibrations in the low frequency range. We proposed a vibration support (ri-notion rubber device). However, in such a fluid-filled vibration damping support, no particular consideration has been given to the rigidity required of the vibration damping support in a direction perpendicular to the axial direction of the mounting shaft.

Purpose of the Invention The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to mainly reduce the vibration in the axial direction of a predetermined mounting shaft, as described above. A vibration isolating support designed to attenuate vibrations in a low frequency range, and can also effectively block vibrations in a high frequency range. The object of the present invention is to provide a fluid-filled vibration-proof support with good rigidity.

Structure of the Invention In order to achieve this object, the fluid-filled vibration isolating support according to the present invention is installed such that a predetermined mounting shaft is inserted through a sleeve and receives the main load in the axial direction. (b) an annular rubber elastic body integrally provided on the plate member located at a substantially central portion in the axial direction in a direction perpendicular to the axial direction; (b) fixed to the plate member on the outer peripheral surface; a rigid cylindrical member coaxially and integrally embedded in the rubber elastic body;
) are provided in the rubber elastic body so as to be located on both sides of the plate member and at predetermined intervals in the circumferential direction, and are opened at mutually opposite ends in the axial direction of the rubber elastic body. a pocket mechanism including a portion of a plurality of first defocus areas 1 and a plurality of second defocus/nod portions; (e) a sealing mechanism that liquid-tightly seals the openings of the pocket portions; and (e) the first blur.
a first orifice means for communicating the first orifice section with the second pocket section; and a second orifice means for communicating the plurality of first pocket sections and the plurality of second pocket sections, respectively. An orifice mechanism, and a predetermined incompressible fluid sealed in a first pocket portion and a second pocket portion of the hollow-to-bottom mechanism, respectively.

Effects of the Invention In the fluid-filled vibration isolating support configured as in q, vibration is applied between the mounting shaft and the plate member mainly in the axial direction of the mounting shaft. If the vibration is in a low frequency range, it is well damped by the flow resistance when the incompressible fluid sealed in the first pocket part and the second pocket part passes through the orifice mechanism, and conversely, the vibration in the high frequency range is If the vibration is in the low frequency range, the lower the dynamic spring constant of the rubber elastic body is, the better it will be blocked. In this case, a good attenuation property is obtained (q), and a good blocking ability is obtained in a high frequency range by 1!7.In addition, a plurality of first pocket portions and second pocket portions are each provided in the circumferential direction, and their are communicated with each other by the second orifice means, so that the mounting shaft has good shielding ability against high-frequency vibration as well as against vibration in an oblique direction (so-called prying direction). This has the advantage of providing good damping characteristics against low frequency vibrations.

Furthermore, in the present invention, since the rigid cylindrical member fixed to the plate member is embedded coaxially and integrally with the rubber elastic body, the axial center required for such a vibration-proof support is The rigidity in the direction perpendicular to this direction can also be significantly increased.

Examples Below, in order to clarify the present invention more specifically,
One embodiment thereof will be described in detail based on the drawings.

First, FIG. 1 and FIG. 2 show a longitudinal cross-sectional view and a cross-sectional view of this embodiment, respectively. In these figures, reference numeral 10 denotes an annular rubber block as a rubber elastic body made of a rubber material with a low dynamic spring constant. Right angle 1i
It is integrally attached to the plate-shaped mounting bracket 2 with vulcanized adhesive, and is fixed to the vehicle body etc. via the J bracket 12. Note that this handle (-J gold R12) constitutes a plate member.

In addition, on both sides of the rubber block 10 in the axial direction separated by the mounting bracket 12, a plurality of first pockets (four in this embodiment) each are opened at the end faces in the axial direction. 14 and a second pocket part 16 are provided. As is clear from FIG. 2, these first blurred portions 14 and second blurred portions 16 are spaces whose cross-sectional shape is arcuate, and are spaced at equal angular intervals in the circumferential direction. In addition, the rubber blocks 10 are provided so as to be located between each other around the axis of the rubber block 10, and so that both ends extending in the circumferential direction overlap each other in the axial direction, and each opening has a disk shape. The first cover fitting 18 and the second cover fitting 20 provide a liquid-tight seal.

On both end faces of the rubber block 10 in the axial direction, caulking fittings 22 and 24 each having a cut-out portion corresponding to the opening of each pocket portion 14 and 16 are vulcanized and adhered. By caulking the flange portion 26 provided on the outer peripheral edge of the metal fittings 22.24, the cover metal fittings 18.20 are fixed in close contact with each of the metal fittings 22.24. Also, each pocket portion 14. is sealed by the cover fittings 18.20.
16 contains a predetermined incompressible fluid 28 such as water or polyalkylene glycol.

Note that, as is clear from the above description, in this example,
Each of four first pocket portions 14 and second pocket portions 16
The mechanism is formed and the cover fitting 18.2
0 and the caulking metal fittings 22 and 24 constitute a sealing mechanism.

Further, inside the rubber block 10, a highly rigid cylindrical part 30 made of metal or the like is fixed to the above-mentioned metal fitting 12 at the central outer peripheral part in the axial direction, and is coaxial with the rubber block 10. It is buried integrally with the This cylindrical member 30 has both end faces in the axial direction exposed to the pocket parts 14 and 16, respectively, and the first pocket part 14 and the second pocket part 16 are provided in the joint wall thereof. A through hole 32 is formed in parallel to the axial direction with an opening at the exposed edge H4). A through hole 32 is formed at a portion where both end portions in the circumferential direction of the both pocket portions 14.1 (i) overlap in the axial direction. This allows the incompressible fluid 28 to flow between them.As is clear from this, in this embodiment, this through hole 32 is used as the first orifice means.

On the other hand, the cover fittings 18 for the caulking fittings 22 and 24.
As shown in FIG. 1, grooves 34 are formed in the circumferential direction on each surface on which the 20 is fixed (
Grooves 34 on the side of the caulking fitting 22 are not shown), and these grooves 34 allow each of the four pocket portions 14, 16 to communicate with each other. In other words, these grooves 34 form a second orifice means, and these grooves 34 and the through hole 32 formed in the cylindrical member 30 form an orifice means that communicates all the pocket parts. -ing

Further, a sleeve 36 is integrally formed on the second cover metal fitting 20 and a boss portion 38 is formed integrally with the first cover metal fitting 18, respectively. In the state in which the first cover fitting 18 is press-fitted into the inner peripheral surface of the sleeve 36, and in the state in which the boss portion 38 is press-fitted into the inner peripheral surface of the sleeve 36, the first cover fitting 18 is attached to the caulking fitting 2 as described above.
2 and 24. Then, a predetermined shaft 42 such as a stratohar is inserted through the sleeve 36, and can be fixed in the inserted state.

As shown in FIG. 1, an annular restraint fitting 44 is integrally attached to the outer periphery of the rubber prong 10 between the j fitting 12 and each caulking fitting 22, 24 by vulcanization adhesion. These restrict the outward bulge of the middle portion of the rubber block 10.

By the way, the vibration isolating support having the above-mentioned structure will be manufactured in the following manner.

First, a mold with a cylindrical member 30 is placed in a predetermined mold.
Metal fittings 12. A pair of restraint fittings 44. Caulking metal fittings 22.24
Then, a core for forming each pocket part 14, 16 is inserted, a rubber abrasive material is injected into the gap between them, and the rubber block 10 is vulcanized and molded. Vulcanize and adhere to. After the vulcanization molding, the core was removed and Go J. Bull, Dock 10
A cavity corresponding to the core, that is, each pocket part, is formed inside.

In this case, as shown in FIG.
A sealing lip 46 is formed on the periphery of each cutout hole 4, and a groove 34 as a second orifice means is simultaneously formed in a recess formed in the circumferential direction on the outer surface so as to communicate with each cutout hole. do.

Next, in a tank containing a predetermined incompressible fluid 28, the sleeve 36 of the second cover fitting 20 is inserted into the center hole 40 of the rubber block 10, and the boss portion 38 of the first cover fitting 18 is inserted into the sleeve 36. After press-fitting each rubber block 10 with pre-compression, each caulking metal fitting 22
．． The flange portions 26 of 24 are caulked, and an incompressible fluid 28 is sealed within each pocket portion 14°16. As a result, the fluid-filled vibration damping support of this example can be obtained. In addition, when enclosing incompressible fluid in both the holes, it is possible to remove the cover fittings that close the openings of some of the holes in the incompressible fluid as described above. Recommended. In this way, the incompressible fluid can be quickly filled into each pocket, and the productivity of the vibration-proof support can be improved.

In the state where the vibration isolating support configured as described above is interposed between the mounting shaft 42 and the vehicle body, etc., the first
As shown by arrow A in the figure, when a relatively low frequency vibration load is applied in the axial direction, the rubber block 10 portion on one side of the mounting bracket 12 is compressed depending on the direction in which the load is applied. Deformed rubber block 1 on the other side
The zero portion is tensilely deformed, one of the first pocket section 14 and the second pocket section 16 is contracted, and the other pocket section is expanded.

As a result, the incompressible fluid 28 contained in the pocket on the side to be contracted is forced to flow into the pocket on the side to be expanded through the orifice means consisting of the groove 34 and the through hole 32. Vibration is effectively damped by the flow resistance generated when the compressible fluid 28 passes through the through holes 34 and 32.

On the other hand, when the frequency of vibrations applied in the axial direction is high, the vibrations are effectively blocked based on the elasticity of the rubber block 10 because the rubber block 10 is made of rubber with a low dynamic spring constant. be done.

In other words, with respect to vibrations applied in the axial direction of the mounting shaft 42, good damping or blocking characteristics can be obtained in both the low frequency range and the high frequency range. Furthermore, the above-mentioned characteristics are
The four first pocket portions 14 and the second pocket portions 16 provided in the circumferential direction are communicated with each other by grooves 34 serving as second orifice means, as indicated by arrow B in FIG. A similar result can be obtained when a vibration load is applied in the twisting direction. If the vibration applied there is a vibration in a low frequency range, good damping characteristics can be obtained due to the flow resistance of the incompressible fluid 28 when passing through the groove 34, which is the second orifice means; Ba,
A good blocking effect is achieved based on the elasticity of the rubber block IO.

Furthermore, as described above, since the cylindrical member 30 fixed to the mounting bracket 12 at its outer circumferential surface is coaxially and integrally buried within the rubber block 10, the lateral rigidity of the vibration isolating support is significantly increased. This also led to it being held in high esteem.

Furthermore, in this embodiment, as described above, the through hole 32 formed in the cylindrical wall of the cylindrical member 30 is used as the first orifice means for communicating the first blurred portion I4 and the second pocket portion I6. In addition, the groove 34 of the caulking metal fitting sealed with the cover metal fitting is used as the second orifice means for communicating each of the second pockets a++z and the second pocket part 16, so that each orifice means can be connected to each other regardless of the magnitude of the applied load. Since the shape of is kept constant,
The vibration damping characteristics are well maintained at the predetermined characteristics, and since the restraint fitting 44 is provided on the outer circumferential surface of the axially intermediate portion of the rubber block 10, The incompressible fluid 28 moves smoothly when the pocket portion contracts and expands, and vibrations are effectively damped.

In addition, in this embodiment, as described above, the rubber block 10
Since the is pre-shrinked, the tensile stress appearing on the rubber block 10 can be effectively avoided, and the sleeve 36 to which the shaft 42 is attached is simply press-fitted into the rubber block 10, so that a large load is not applied in the direction A. Since shear stress is not generated in the rubber block 10 even when the vibration is applied, the durability of the vibration-proof support is improved.

Although one embodiment of the present invention has been described above, this is a literal illustration, and the present invention should not be construed as being limited to the embodiment.

For example, in the embodiment described above, each of the pocket parts 14 and the four pocket parts 6 constituting the pocket mechanism were provided at equal angular intervals in the circumferential direction, and in addition, they were provided so as to be located between each other. Of course, their number, relative positional relationship, etc. can be changed as appropriate depending on the purpose.

Further, in the above embodiment, one through hole 32 formed in the cylindrical wall of the cylindrical portion 4A'30 in parallel to the axis was used as the first orifice means. The number of through holes 32 is not limited to one, and the through holes 32 do not necessarily have to be provided parallel to the axis, but may be provided in a spiral shape. Such a helical through-bore can advantageously be formed by combining two cylindrical parts (as a double cylinder) and by means of a groove provided between them. In addition, the cylindrical part month 30
It is also possible to provide the first orifice means outside the cylindrical wall of the tube. It goes without saying that when the first orifice means is formed outside the inner side of the cylindrical wall of the cylindrical member, it is not necessary to expose both ends of the cylindrical member in the axial direction to the respective pockets.

Also, regarding the second orifice means, the caulking metal fitting 2
2. Not limited to using the groove 34 formed in 24,
A groove formed on the cover fitting 18.20 side may be used, and in this way, the second orifice means may be formed at a location other than between the caulking fitting 22.24 and the cover fitting 18.20.C Good too.

Furthermore, in the embodiment described above, the sleeve 36 to which the predetermined mounting shaft 42 is attached was formed integrally with the second cover fitting 20, but they may be separate bodies.

In addition, various modifications may be made without departing from the spirit of the present invention, although they are not listed here.

Of course, the present invention can be implemented in a modified form.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, and corresponds to the I-1 section in FIG. 2. Figure 2 is the same as Figure 1.
−■ It is a sectional view. FIG. 3 is a sectional view corresponding to FIG. 1, showing the rubber block in the embodiment of FIG. 1 before the incompressible fluid is sealed therein. IO: Rubber block (rubber elastic body) 12: Mounting fitting (plate member) 28: Incompressible fluid 30: Cylindrical member (orifice means) 36: Sleeve 42: Mounting shaft Applicant: Toyota Motor Corporation Tokai Rubber Industries, Ltd.

Claims (1)

[Scope of Claims] an annular rubber elastic body integrally provided on a plate member located in the direction; and a rigid rubber elastic body fixed to the plate member on the outer circumferential surface and coaxially and integrally embedded within the rubber elastic body. a cylindrical member, located on both sides of the plate member in the rubber elastic body and at a predetermined interval in the circumferential direction, and at opposite ends of the rubber elastic body in the axial direction; a pocket mechanism including a plurality of first pocket parts and a plurality of second pocket parts, each of which is opened;
a sealing mechanism that is located on both sides of the rubber elastic body in the axial direction and seals the opening of each of the pockets liquid-tightly; and the first pocket and the second pocket. an orifice mechanism having a first orifice means for communicating with each other, and a second orifice means for communicating with the plurality of first pocket portions and the plurality of second pocket portions, and a first pocket portion of the pocket mechanism; and a predetermined incompressible fluid sealed in each of the second pocket parts. (2) The sealing mechanism is sufficient to cover the annular caulking metal fitting fixed to the end of the rubber elastic body and having a window portion corresponding to the opening of the pocket portion, and the window portion of the caulking metal fitting. claim 1, wherein the cover metal fitting is made of an annular cover metal fitting having a size of approximately 1.5 mm, and the cover metal fitting is positioned on the caulking metal fitting, and the cover metal fitting is fixed by caulking of the caulking metal fitting. Anti-vibration support as described. (3) Ends of the cylindrical member are exposed in the first pocket and the second pocket, and the inside of the cylindrical wall of the cylindrical member is moved from one end to the other end. 3. The vibration isolating support 14 body according to claim 1, wherein the first orifice means is formed by a through-hole. (4) Claims 1 to 3, wherein the second orifice means is formed by a circumferential passage provided between the caulking fitting of the sealing mechanism and the cover member.
The anti-vibration support described in any of paragraphs. (5) The vibration isolation according to any one of claims 1 to 4, wherein the sleeve positioned inside the rubber elastic body has a non-adhesive structure to the rubber elastic body. support.