JPH0624595Y2 - Fluid filled anti-vibration support - Google Patents

Description

[Technical Field] The present invention is used in an automobile or the like, and is applied to a predetermined mounting shaft to provide a fluid-filled type vibration-damping support that mainly damps or blocks vibration in the axial direction. In particular, it is possible to adjust and set vibration damping characteristics or rigidity in the direction perpendicular to the axis, and to prevent abnormal noise during operation and to improve durability advantageously. Is related to the structure of.

(Prior Art) A type of anti-vibration support used for a suspension of a vehicle such as an automobile, which is attached to a predetermined mounting shaft to mainly dampen or block vibration in the axial direction. There is. For example, it is an anti-vibration support used for a body mount or cab mount of an automobile, a member mount, a strut bar cushion, or the like.

By the way, in such an anti-vibration support, conventionally, in order to improve the vibration damping or blocking ability in the axial direction, a predetermined fluid is sealed inside the main body rubber,
Various so-called fluid-filled types have been proposed which utilize the flow resistance of the enclosed fluid when passing through the orifice in addition to the elasticity of the rubber body.

However, in these conventional fluid-filled type anti-vibration supports, no special consideration is given to the characteristics of the mounting shaft in the direction perpendicular to the axial direction, and therefore the vibration damping particularly in the axial direction is not considered. That is, it was difficult to increase the rigidity in the direction perpendicular to the axis while maintaining the blocking ability.

Therefore, the applicant of the present application has previously filed Japanese Patent Application Laid-Open No. 60-20113.
In Japanese Patent Laid-Open No. 6, a rubber having a plurality of fluid chambers, which is interposed between axial vibrations exerted between a sleeve through which a predetermined mounting shaft is inserted and a mounting plate member, is interposed therebetween. In a fluid-filled type vibration-damping support body that is damped or blocked by an elastic body, a rigid cylindrical member fixed to a mounting plate member is provided inside the rubber elastic body coaxially with the mounting shaft. By embedding it integrally, the mounting shaft and the mounting plate member can be elastically coupled with a predetermined rigidity in the direction perpendicular to the axis by the rubber elastic body interposed between the sleeve and the cylindrical member. The support structure was clarified.

(Problem) However, in such an anti-vibration support, a rubber elastic body is usually vulcanized and adhered to the outer peripheral surface of the sleeve at its inner peripheral surface, or at both axial end portions of the sleeve. Since the structure is fixed to the end in the axial direction and sealed in a liquid-tight manner, when a vibration in the axial direction is input to the sleeve and the mounting plate, the support of the former structure is provided. In that case, since a large shear strain is generated in the rubber tubular body interposed between the sleeve and the inner tubular member, it is difficult to say that the durability is good. Is caused by the deformation of the rubber elastic body, which causes slippage between the contact surfaces of the sleeve and the rubber elastic body, which causes abnormal noise. When excessive displacement of No measures were taken and therefore there was still room for improvement.

(Solution) Here, the present invention has been made in view of the above-mentioned circumstances, and is characterized in that a predetermined mounting shaft is inserted on the outer side in a radial direction of a sleeve.
An orifice is provided with an orifice provided inside a cylinder wall, and an internal rubber is interposed between the orifice cylinder and the sleeve, and the orifice cylinder extends in a direction perpendicular to the outer peripheral surface of the orifice cylinder. While the mounting plate member is integrally fixed, cylindrical body rubbers are integrally provided on the plate member so as to be located on both sides of the plate member, respectively, and the opening ends of the body rubbers on the outer side in the axial direction. In the fluid-filled type vibration-proof support body in which a plurality of fluid chambers communicated with each other by the orifice of the orifice cylinder are formed by closing each of the inner rubber and the inner rubber against the outer peripheral surface of the sleeve. In addition to the adhesion, the inner rubber is made shorter than the axial length of the sleeve to expose the outer peripheral surface of the sleeve to the fluid chamber, While allowing the fluid in the fluid chamber to enter between the outer peripheral surface of the sleeve and the inner peripheral surface of the inner rubber by relative displacement of the sleeve, and in the axial direction of one of the orifice cylinders in the fluid chamber. A stopper rubber is provided on the end surface so as to face each other at a predetermined distance, and a portion of the stopper rubber facing the opening of the orifice formed in the orifice cylinder is formed as a recess.

(Effect of the Invention) Therefore, in the fluid filled type vibration-proof support having the structure according to the present invention, the shaft center input between the sleeve through which the mounting shaft is inserted and the mounting plate member is provided. The vibration in the direction is attenuated or blocked by the elastic force of the main body rubber and the flow resistance of the fluid enclosed in the plurality of fluid chambers when passing through the orifices, while both members are provided between the orifice cylinder and the sleeve. By the internal rubber interposed in the shaft, the rubber is elastically connected in a direction perpendicular to the axis with a predetermined rigidity.

And in such a vibration-proof support, the internal rubber fixed to the inner peripheral surface of the orifice cylinder is
Vibration is applied between the sleeve and the mounting plate member in the axial direction because it is displaceable and is inserted such that the enclosed fluid can enter between the sliding surfaces of these members. In this case, the inner rubber causes a smooth relative movement in the axial direction with respect to the sleeve, and therefore, the shear strain and the abnormal noise in the inner rubber can be effectively prevented.

Moreover, in such a vibration-proof support body, a stopper rubber is arranged in the fluid chamber, and the contact of the orifice cylinder with the stopper rubber effectively prevents the excessive displacement due to the input of a large vibration load. Even when such contact is made, the stopper rubber is formed with a recessed portion at a portion facing the opening of the orifice formed in the orifice cylinder, and the Since the height is lowered, the communication state of the orifices is maintained, so that the vibration damping action of the orifices can be effectively exhibited.

Further, in such a vibration-proof support, since the internal rubber and the main body rubber can be formed separately, it is possible to set different characteristics for each rubber. By adopting only a high hardness, it has the advantage that the elasticity of the main body rubber maintains a soft riding feeling while increasing the lateral rigidity and easily improving the steering stability. Of.

(Embodiment) Hereinafter, in order to more specifically clarify the present invention, one embodiment of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a longitudinal sectional view of a fluid-filled type vibration-damping support having a structure according to the present invention. In this figure, 10 is a sleeve having a long cylindrical shape, and a predetermined mounting shaft such as a strut bar in a suspension device of a vehicle is inserted into a center hole 12 of the sleeve to be mounted.

Further, a cylindrical orifice tube body 14 is concentrically arranged on the radially outer side of the sleeve 10 so as to face each other with a predetermined distance in the axial center part.
The orifice cylinder 14 is configured by press-fitting and integrating an inner cylinder 18 with an outer cylinder 16.

That is, as shown in FIG. 2, the outer cylindrical body 16 has a groove 2 extending axially on the inner peripheral surface thereof.
0 is provided in one line or a plurality of lines (two lines at positions facing each other in the radial direction) having a predetermined cross-sectional area, while a plate-like attachment for attaching to a vehicle or the like is provided on the outer peripheral surface thereof. The plate 22 is integrally fixed so as to extend in the radial direction.

Further, on the outer peripheral surface of the outer cylindrical body 16, a substantially cylindrical main body rubber 24 is divided in a direction perpendicular to the axis by the mounting plate 22 and in the same axial center as the outer cylindrical body 16. , Are integrally provided by vulcanization adhesion or the like. Further, the mounting plate 2 on the body rubber 24
On both sides in the axial direction separated by 2,
An annular restraint fitting 26 is provided at the outer peripheral portion of the central portion in the axial direction.
However, at the axially outer end, the caulking metal fitting 28 is
Each is integrally provided by vulcanization adhesion.

On the other hand, the inner tubular body 18 is formed with the same length as the outer tubular body 16, and as shown in FIG.
An inner rubber 30 having a predetermined length and having a cylindrical shape is integrally provided on the inner peripheral surface thereof by vulcanization adhesion or the like.

Then, the inner cylinder 18 is press-fitted into the outer cylinder 16 to form the groove 20 formed in the outer cylinder 16.
By covering the inner circumferential side opening of the inner cylindrical body 18 with the outer peripheral surface of the inner cylindrical body 18, the orifice 32 penetrating in the axial direction is formed between these two members, and thereby the orifice cylindrical body 14 is formed. Further, the rubber block 34 integrally including the main body rubber 24 and the internal rubber 30 is formed with the mounting plate 22 interposed therebetween.

Further, this rubber block 34 is
0 is non-bonded to the outside and is arranged on the outside in the radial direction, and at both ends in the axial direction thereof, the annular plate-shaped first and second cover lid fittings 38, respectively. , 40
Are arranged and fixed by caulking by caulking metal fittings 28, 28 provided on the rubber block 34. That is, by thus inserting the rubber block 34 onto the sleeve 10, the pocket portions 36 are formed between the inner peripheral surface of the main body rubber 24 and the outer peripheral surface of the sleeve 10 on both sides of the mounting plate 22, respectively. And the axially outward openings of the pockets 36, 36 are covered by the first and second cover fittings 38, 40, respectively.
On the outer side in the radial direction, two fluid chambers 42, 42 having a cylindrical shape and coaxially positioned in the axial direction are formed. Then, in these fluid chambers 42, 42,
A predetermined incompressible fluid such as water or polyalkylene glycol is enclosed.

Here, since the inner rubber 30 fixed to the inner peripheral surface of the inner tubular body 18 is molded with an axial length shorter than the axial length of the sleeve 10, the outer peripheral surface of the sleeve 10 has a fluid chamber 42. The inner diameter of the inner rubber 30 is slightly smaller than the outer diameter of the sleeve 10 so that the inner rubber 30 can slide on the outer peripheral surface of the sleeve 10 in the axial direction. Since the internal rubber 30 is relatively displaced in the axial direction on the sleeve 10, the enclosed fluid can enter between the two members (between the sliding surfaces). ing.

On the other hand, an annular seal rubber 44 is fixed to each of the first and second cover metal fittings 38, 40 by vulcanization adhesion or the like at a portion where the axial end surface of the sleeve 10 abuts. A boss portion 46 extending in the axial direction by a predetermined length is integrally erected on the inner side of the seal rubber 44 in the radial direction, and in a state where the boss portion 46 is press-fitted into the central hole 12 of the sleeve 10. , The outer peripheral edge portion is fixed by the caulking metal fitting 28, so that the pocket portion 36
While covering the opening of the with a sufficient sealing property,
It can be attached.

Further, as shown in FIG. 4 and FIG. 5, the first cover member 38 projects into the fluid chamber 42, and its projecting end surface is a predetermined distance from the axial end surface of the orifice cylinder 14. Cylindrical stopper rubber 48 facing each other with a gap
Is integrally formed with the seal rubber 44 and fixed thereto. In the stopper rubber 48, the portion facing the opening of the orifice 32 formed in the orifice cylinder 14 is formed as a recessed portion 50, and the height thereof is lowered, so that the stopper rubber 48 is reduced. The communication state of the orifice 32 can be secured even when the orifice cylinder 14 is brought into contact with the nozzle 48.

In the vibration-proof support having such a structure, as shown in FIG. 1, the sleeve 10 and the first and second cover metal fittings 38, 40 are inserted into their center holes. The mounting plate 22 is mounted on a predetermined member 54 to be connected to the mounting shaft 52 while being mounted on the predetermined mounting shaft 52.

Therefore, when vibrations in the axial direction are input to both the members 52 and 54 with respect to the anti-vibration support body in the present embodiment, elastic deformation of the main body rubber 24 is caused and the two fluids are Based on the relative change in volume of the chambers 42, 42, the flow of the fluid through the orifice 32 formed in the orifice cylinder 14 is induced, whereby the vibration can be damped and blocked. In this embodiment, the contact of the orifice cylinder 14 with the stopper rubber 48 restricts the excessive displacement in one axial direction.

Then, when such vibration is input in the axial direction, the inner rubber 30 is reciprocally displaced on the outer peripheral surface of the sleeve 10 in the axial direction, and at the time of the displacement, the sliding thereof is performed. Since the enclosed fluid is allowed to enter between the surfaces and the invading fluid functions as a lubricant,
Such reciprocating displacement can be performed extremely smoothly and smoothly, and therefore, excessive shear stress is not generated on the internal rubber 30, and abnormal noise is generated during the displacement. It can be effectively prevented.

In this case, the fluid that enters between the sleeve 10 and the internal rubber 30 needs to be limited to such a degree that the fluid is interposed between the two members. When the fluid flows between the fluid chambers 42, 42 through the sliding surfaces, the amount of the fluid flowing through the orifice 32 is reduced, and the original fluid generated by the orifice 32 is reduced. This is because the vibration damping function cannot be fully exerted. In addition, it is necessary to consider prevention of early wear of the internal rubber 30 due to the reciprocating displacement. Therefore,
For example, by setting the surface roughness of the sliding surface of the sleeve 10 to 10 Z or less, early wear of the internal rubber 30 is prevented,
Further, it is desirable that the inner rubber 30 be press-fitted into the sleeve 10 with an appropriate tightening margin that can prevent the fluid from flowing between the sliding surfaces.

On the other hand, when the vibration in the direction perpendicular to the axis is input to the vibration isolating support, a predetermined vibration is generated based on the elastic deformation of the internal rubber 30 arranged between the orifice cylinder 14 and the sleeve 10. The blocking ability can be exhibited. The elastic characteristic of the internal rubber 30 affects only the vibration-proof characteristic of the vibration-proof support against the vibration in the axis-perpendicular direction, and particularly in the vibration-proof support according to the present embodiment, Since the internal rubber 30 is formed separately from the main body rubber 24, it is possible to set the characteristics independently of the vibration isolation characteristics of the main body rubber 24 in the axial direction of the anti-vibration support body. Therefore, when used as a strut bar cushion of an automobile, for example, by using a rubber material having a high hardness only for the inner rubber 30, vibration damping or blocking ability in the axial direction (front-rear direction of the vehicle), that is, a riding feeling can be obtained. As it is, the steering stability can be improved by increasing the rigidity in the axis-perpendicular direction (vehicle lateral direction).

Further, in the vibration-proof support according to the present embodiment, since the seal rubber 44 is formed separately from the main body rubber 24 or the internal rubber 30, the main body rubber 24 is
In addition to the characteristics of the internal rubber 30 and the internal rubber 30, it is also possible to use a material that does not easily sag.

Furthermore, in the vibration-proof support according to this embodiment, since the orifice cylinder 14 is composed of the outer cylinder 16 and the inner cylinder 18, the orifice cylinder 1 is
4 is extremely easy to form, and the main body rubber 24 and the inner rubber 30 are molded from different rubber materials, and different elastic characteristics can be easily set. I have it.

As described above, one embodiment of the fluid-filled type anti-vibration support having the structure according to the present invention has been described in detail. However, this is a literal example, and the present invention should be construed as being limited to such a specific example. Not something.

For example, in the anti-vibration support body in the above-described embodiment, the stopper rubber 48 that regulates the displacement amount in the axial direction is provided in the one fluid chamber 42, but such a regulation member is necessary. In accordance with the above, the fluid chambers 42, 42 on both sides are also provided.

And in the said Example, such stopper rubber 4
8 is formed integrally with the seal rubber 44, but by forming the stopper rubber 48 separately from the seal rubber 44, the material thereof is set to the main body rubber 24, the internal rubber 30, or the seal rubber 44. It is possible to adopt a material having a unique elastic characteristic without being influenced by the characteristic to be processed.

Further, the orifice cylinder 14 in the above-described embodiment is composed of two members, but it is of course possible to form it as one member, and the orifice formed inside the orifice cylinder 14 has a cross-sectional area and The length is determined according to the vibration frequency for the purpose of damping, and can be formed in a spiral shape inside the orifice cylinder, for example.

In addition, although not listed one by one, the present invention can be implemented in a mode in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art, and such an embodiment is the gist of the present invention. Needless to say, all of them are included in the scope of the present invention without departing from the above.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view showing a fluid-filled type vibration-damping support as one embodiment of the present invention, and FIG. 2 is a vertical section showing a vulcanized molded body rubber as a component of such a support. FIG. 3 is a plan view, FIG. 3 is a vertical cross-sectional view showing a vulcanization molded product of an internal rubber, FIG. 4 is a plan view showing a cover lid fitting, and FIG. 5 is a cross-sectional view taken along line VV in FIG. Is. DESCRIPTION OF SYMBOLS 10: Sleeve, 12: Central hole 14: Orifice cylinder, 22: Mounting plate 24: Main body rubber, 30: Internal rubber 32: Orifice, 34: Rubber block 38: First cover fitting, 40: Second cover Metal fittings 42: Fluid chamber, 44: Seal rubber 48: Stopper rubber, 52: Mounting shaft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihito Hachiya, Komaki City, Aichi 3600 Gyokutsuyama, Amamitsu Tokai Rubber Industry Co., Ltd. (56) Reference JP-A-61-130639 (JP, A) JP Showa 60-201136 (JP, A) Actually opened Showa 62-215142 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An orifice cylinder having an orifice provided in a cylinder wall is externally inserted to the outer side in the radial direction of a sleeve through which a predetermined mounting shaft is inserted, and an internal portion is provided between the orifice cylinder and the sleeve. While interposing rubber, an attachment plate member extending in the direction perpendicular to the axis is integrally fixed to the outer peripheral surface of the orifice cylinder, and a cylindrical main body rubber is provided so as to be located on both sides of the plate member. A fluid enclosure in which a plurality of fluid chambers communicated with the orifice of the orifice cylinder are formed by integrally providing with the plate member and further closing the axially outer open ends of the body rubbers. In the anti-vibration support, the internal rubber is not adhered to the outer peripheral surface of the sleeve, and the internal rubber is made shorter than the axial length of the sleeve so that The outer peripheral surface of the sleeve is exposed to the fluid chamber, and the relative displacement of the inner rubber with respect to the sleeve allows the fluid in the fluid chamber to enter between the outer peripheral surface of the sleeve and the inner peripheral surface of the inner rubber. On the other hand, in the fluid chamber, a stopper rubber is provided to face one axial end surface of the orifice cylinder at a predetermined distance, and the stopper rubber is further provided at the opening of the orifice formed in the orifice cylinder of the stopper rubber. A fluid-filled type vibration-damping support characterized in that the opposing portions are recessed portions.