JPS58170609A - Suspension bushing construction - Google Patents

Abstract

PURPOSE:To prevent deformation due to torsion by interconnecting integrally inner and outer tubular members with an annular elastic member provided on the outer periphery with a plurality of recesses to provide further a slide mechanism allowing said members to slide around the axis inside the inner tubular member. CONSTITUTION:This bushing construction is constituted from an arm eye 14 of an outer tubular member fixed to an end of a suspension arm 12 and a bushing simplex 16 forced into the eye 14. And the bushing simplex 16 is constituted from an annular rubber sleeve 18, a cylindrical metal body 20 vulcanized and bonded to the outer periphery of the rubber sleeve 18, an inner metal tube 22 forced inside the rubber sleeve 18, a lubricating sleeve 24 made of oreo resin as a slide mechanism disposed inside the inner metal tube 22 and an inner metal sleeve 26 concentric with said sleeve 24. Also said rubber sleeve 18 is provided on the symmetrical positions of the outer periphery with two recesses 28 in which is enclosed non-compressive fluid 50.

Description

[Detailed Description of the Invention] The present invention relates to a suspension bushing structure, which particularly improves assembly or assembling workability, facilitates mass production, and is hardly affected by torsional deformation. This invention relates to the structure of a suspension bushing for a vehicle.

Traditionally, in vehicle suspensions, suspension members such as various arms, ronds, and links are attached to swing in various directions in order to suspend wheels, differentials, etc. on the vehicle body or frame. Generally, suspension bushings are incorporated into the pivot joints at both ends of the suspension member for the purpose of damping vibrations.

By the way, such suspension bushings generally include an annular rubber sleeve interposed between an inner cylindrical metal fitting into which a predetermined pivot shaft is inserted for suspension of the vehicle, and an outer cylindrical metal fitting arranged concentrically with the inner cylindrical metal fitting. It has an inserted structure,
Vibration is damped by deforming the rubber sleeve, but recently it has become necessary to use a rubber material that forms such a rubber sleeve with a particularly high damping coefficient, and it is not necessary to use a rubber material that has a particularly high damping coefficient. Composite bushings have been proposed that produce desirable damping.

Namely, Japanese Patent Publication No. 48-36151, Japanese Patent Publication No. 52
As disclosed in Publication No. 16554, etc., such a composite rubber sleeve is provided with a plurality of recesses on the surface of a rubber sleeve inserted between an inner cylindrical metal fitting and an outer cylindrical metal fitting. It has a structure in which the pockets formed between the inner wall of the cylindrical metal fitting and the inner wall of the cylindrical metal fitting are filled with a predetermined fluid, and these pockets are communicated through an orifice. Good damping is ensured by the resistance created as fluid flows through the orifice and into the other pocket.

Therefore, in a known composite bushing having such a configuration,
Since the rubber sleeve is press-fitted into the foreign metal fitting and a pocket part is formed, the rubber sleeve is deformed and the pocket part deforms, resulting in an unstable shape.
After the press-fitting operation, a post-adhesive (secondary vulcanization) process is inevitably required to bond between the outer shell and the com- mune leaf, which has the inherent problem of having a negative impact on productivity and cost. ing.

In addition, since the outer cylindrical metal fitting and the rubber sleeve are bonded afterward, it becomes extremely difficult to fill each pocket with fluid. As shown in Figure 8, a filling method has been disclosed in which fluid is injected with one needle, while air inside the pocket is taken out with the tub needle. With the fluid filling method, not only can the rubber be damaged, but the filling operation is abrasive and cumbersome, reducing the ease of assembly or assembly, and also poses problems in mass production. There it was.

Furthermore, when such a composite bushing is mounted on a vehicle, the composite bushing is subjected to significant torsional deformation;
When subjected to this torsional deformation, the pocket portion in which the fluid is sealed also undergoes torsional deformation. When the fluid-filled pocket is compressed due to such torsional deformation, there is a problem in that the original effect of fluid filling is reduced.

The present invention has been made in view of the above circumstances, and its main purpose is to provide a suspension push (composite bush) that utilizes a fluid medium and has high damping characteristics. The goal is to make improvements.

Further, another object of the present invention is to significantly improve assembly workability and increase mass productivity, and furthermore, the pocket portion filled with fluid is hardly deformed even when torsional force is applied. Thus, it is an object of the present invention to provide a suspension bushing for a vehicle in which the effect of fluid entry is constant under any usage conditions.

In order to achieve these objects, the present invention includes (a) a cylindrical inner member; and (b) a cylindrical inner member (411111111) of the inner member (separated radially outwardly from A and concentrically arranged around the inner member). a cylindrical outer member located between the inner member and the outer member; (d) an annular elastic member having a separate pocket defined by an inner wall of the elastic member and the recess; a cylindrical rigid member with windows corresponding to the recesses, and (e) [
) a communication path for communicating the number of pocket portions with the number of pockets; (r) a predetermined incompressible fluid sealed in the plurality of pocket portions; (g) a communication path between the inner member and the inner side “7 ( The suspension includes a sliding mechanism that is provided between a pivot shaft supported by a predetermined member that is inserted into the material, and that allows sliding around the axis between the monument pivot and the inner member. They formed Bush.

Therefore, in a bushing having such a structure, a rigid member is fixed, for example, vulcanized and bonded, to the outer peripheral surface of a predetermined elastic member having a recess, and then this is inserted (press-fitted) into the outer member. Moreover, since sealing can be effectively performed between the rigid member and the inner wall surface of the outer member, the conventional post-bonding process between the elastic member and the outer member is completely unnecessary, and the manufacturing process can be simplified. In addition, since the rigid member can be press-fitted into the outer part I in an incompressible fluid, the filling of the fluid into the pocket part can be done simultaneously with the press-fitting operation. , there is no need to adopt special fluid filling (injection) operations,
As a result, the ease of assembling the bushing was significantly improved, and it became possible to use it in quantity.

In addition, regarding the torsional force that acts on the bushing, a predetermined sliding mechanism is interposed between the pivot and the inner member, so that the structure allows active sliding between them. The fluid-containing pocket formed in the bushing is almost never torsionally deformed, and as a result, the position of the fluid in the bushing remains constant, and the effect of fluid sealing is maintained under any conditions of use. It produces a constant and excellent effect.

Furthermore, since the elastic member integrated with the rigid member by vulcanization molding is press-fitted into the outer member through the rigid member, deformation of the elastic member is small, and therefore the pocket portion (fluid-filled portion) ) has the effect of keeping the shape constant,
Since a reliable close contact area is formed between the outer member and the rigid member, there is an advantage that the volume of a part of the pocket 1 can be increased, and furthermore, a large pressure receiving area can be obtained without changing the spring characteristics of the elastic member. As a result, the sealing effect against leakage of the fluid filled in the pocket can be improved.

EMBODIMENT OF THE INVENTION Hereinafter, in order to clarify the present invention more specifically, embodiments according to the present invention will be described in detail based on the drawings.

First, FIGS. 1 and 2 show an arm eye portion at the end of a suspension arm that employs the bushing structure according to the present invention, where the bushing is fixed to the end of the suspension arm 12. It is composed of an arm eye 14 as a cylindrical outer member, and a dash unit 16 press-fitted into the arm eye 14.

As shown in FIGS. 3 and 4, this bushing unit 16 is made up of a rubber sleeve 1 which is a circular elastic member.
8, a metal cylindrical body (rigid member) 20 vulcanized and bonded to the outer periphery of the rubber sleeve 18, an inner cylindrical fitting 22 which is an inner member press-fitted inside the rubber sleeve 18, and the inner cylindrical fitting. It consists of a lubricating sleeve 24 made of oil-impregnated resin further disposed inside the lubricating sleeve 22, and an inner metal sleeve 26 concentric with the lubricating sleeve 24.

More specifically, the rubber sleeve 18 has two circumferentially extending symmetrical recesses 28, 28 at positions symmetrical to the axis of its outer circumferential surface, and these recesses 28 They are communicated through a communication hole 30 passing through the sleeve 18. Further, the cylindrical body 20 is connected to the rubber sleeve 18.
It has two windows 82, 82 which are opened in a slightly larger shape at positions corresponding to the recess 28, and the recess 28 is opened outward by the windows 32. In other words, a shallow recess (stepped portion) 34 is provided on the outer circumferential surface of the cylindrical body 20 in the axial direction near the window 32. In other words, two windows 32 and 32 are opened symmetrically within this recess 34.Then, by simultaneous vulcanization, the rubber material constituting the rubber sleeve 18 is exposed to the outside from the window 32. The sealing rubber part 36 is formed integrally with the rubber sleeve 18 therein, and a sealing rubber part 36 is formed integrally with the rubber sleeve 18 in the recess 34 of the cylindrical body 20. A number of ring-shaped protrusions 40 are provided on both sides of the ring 28.

The rubber sleeve 18 is manufactured by a simultaneous vulcanization molding operation in which the cylindrical body 20 is set in a predetermined mold and vulcanization molded so that the recess 28 is underfilled. The outer circumferential surface of the rubber sleeve 18 and the inner circumference of the cylindrical body 20 are effectively fixed. The rubber sleeve 18 obtained by such simultaneous vulcanization molding.

It has a shape as shown in FIG. 5, and has ring-shaped grooves 42 and 42 near both ends of the inner hole.
is provided with an inner cylinder fitting 2 shown in FIG.
The large diameter portions 44 and 44 at both ends of 2 are fitted.

Furthermore, as shown in FIG. 7, the lubricating sleeve 24 and the metal sleeve 26 constituting the sliding mechanism are composed of two parts that are separated approximately at the center in the axial direction, and one end of the lubricating sleeve 24 and the metal sleeve 26 are lubricated at one end. The sleeve 24 has a large diameter portion 4.
6 is provided.

The sliding mechanism parts (24, 26) shown in FIG.
It is manufactured by injection molding (insert molding) an oleoresin, which is a self-lubricating material with low friction, in the presence of the metal sleeve 26.

Therefore, each component shown in FIGS. 5 to 7 is assembled into a set 1\
6, is first press-fitted into the rubber sleeve 18 shown in FIG. 5, and then the sliding parts shown in FIG. 7 are inserted from both ends of the rubber sleeve 18, respectively. By setting, the single bushing 16 shown in FIGS. 3 and 4 is completed. By such assembly, the large diameter portions 44 at both ends of the inner cylinder fitting 22 are fitted into the ring-shaped grooves 42 of the rubber sleeve 18, and the large diameter portion 46 of the sliding component (24) is also fitted. This will prevent it from falling off. Through such press-fitting and assembly operations, a predetermined precompression is applied to the rubber sleeve 18.

And, such a bush 16 is water.

Polyargylene glycol, silicone oil, low molecular weight
++In a non-compressible fluid 50 such as a fuel body, the recess 28 of the non-compressible fluid 50 is pressed against the arm eye 14 of the suspension arm 12.
At the same time as filling the pocket portion, the suspension bushing having the structure shown in FIGS. 1 and 2 is completed. In addition, the bushing alone 16 and the arm eye 14
Care has been taken to ensure that there is an appropriate press-fitting allowance between the two.

Therefore, in such a bush structure, the outer ff
i Material arm eye 14 and recess 2 of rubber sleeve 18
The filling operation of filling the fluid 50 into the pocket portion defined by Assembling workability has been significantly improved, and mass production has become easier, and problems such as damage to the rubber sleeve 18 caused by the injection needle have been completely eliminated.

Further, by press-fitting the rigid cylindrical body 200, a reliable close contact portion is formed between the arm eye 14, which has the advantage of increasing the volume of the pocket portion, and changing the spring characteristics of the rubber sleeve 18. Therefore, the pressure receiving area can be increased without any problem, and the sealing effect can be effectively improved. Projection 4o
The sealing effect between the cylindrical body 20 and the arm eye 14 is further enhanced by the presence of the cylindrical body 20 and the arm eye 14, and there is no possibility that the fluid 50 contained in the pocket portion leaks to the outside through the gap therebetween.

Moreover, when a torsional deformation force, in other words, a force to rotate around the axis is applied to such a bushing, the presence of the self-lubricating lubricating sleeve 24 causes the inner cylindrical metal fitting 2 to
2 and the metal sleeve 26, the resulting torsional force will hardly act on the rubber sleeve 18, and therefore it will cause deformation of the rubber sleeve 18 and, therefore, denting. Deformation of the location 28 or the communication hole 30 hardly occurs. As a result, the recess 2 filled with the fluid 50
The position of 8 is constant, and the effect of entering the fluid can be stably exhibited under any usage conditions.

In addition, the Sanupension push with this structure is similar to conventionally known composite bushes.

When the fluid 50 contained in one pocket part (28) moves to the other pocket part (28) through the communication hole 3o during excitation vibration, the effect is due to the flow resistance generated in the communication hole 30. This results in a significant attenuation. That is, irrespective of the rubber material used to form the rubber sleeve 18, a desirable damping effect can be achieved as a cushioning characteristic of the bushing.

Next, another embodiment of the present invention will be explained based on FIGS. 8 to 10, but the same parts as the bushings of the above embodiment will be given the same reference numerals and the explanation will be omitted. .

First, in the example of the present invention shown in FIGS. 8 and 9, the communication path for communicating the two pocket portions (28) is provided in the rubber cleave 18 as in the example. It is different in that it is formed between the arm eye 14 and the cylindrical body 20. That is, by providing the groove 52 on the outer peripheral surface of the cylindrical body 20, when the circular N body 20 is press-fitted into the arm eye 14, two pocket portions are formed by the inner wall surface of the arm eye 14 and the groove 52. (28) is formed.

Further, in FIG. 10, a communication hole 54 passing through the inside of the cylindrical body 2o is provided, and one pocket portion (28) is communicated with the communication hole 54.

Like these, the cylindrical body 20 has two pockets (28
), even if the rubber sleeve 18 is deformed, the communication path (52, 54)
There is a 4:1j point where there is no deformation at all. In addition, in case 1>K where a communicating path is formed in the cylindrical body 2o, it is desirable that the cylindrical body is made of a molded product such as synthetic resin or FRP.

L-J, h, Several Embodiments of the Present Invention and Variations 1 Although two examples have been described, the present invention is by no means to be construed as being limited by these examples.

The size and shape of the recess 28 formed in the twisted rubber sleeve (elastic member) 18 and the window 32 provided in the cylindrical body 2o, which is a rigid member; the size of the communication hole 3o, etc., depend on the requirements of the intended bushing. It can be changed as appropriate depending on the characteristics, and in addition to the above example, it is possible to use a fluid communication path provided at another appropriate location as the communication path for communicating the recesses 28. It is not limited to only two cases.

In addition, the lubricating sleeve 24 and the metal sleeve 26 as in the above example are also available.
In addition to the sliding mechanism consisting of the above, various known sliding mechanisms for sliding between the fitted pivot and the inner cylinder fitting 22 may be employed, and the present invention is directed to these known sliding mechanisms. Any sliding mechanism can be used. In addition, the lubricating sleeve 24 of the above example can also be formed from a self-lubricating material with low friction other than oleoresin, and in some cases, the sliding mechanism can be configured only with the lubricating sleeve 24. I can do it.

Furthermore, in each of the embodiments described above, each bushing 11 is press-fitted into the suspension arm 12 (7) 7-meye 14 to form a bushing. Although it is
It is also possible to use a rigid cylindrical body made of metal or the like as an attachment, press-fit the bushing alone into the cylindrical body to form a bushing, and attach it to a predetermined suspension member. .

Furthermore, as a sealing means between the arm eye (outer member) and the cylindrical body (rigid member), various types of sealing means can be used in addition to the previous example.For example, a rubber sleeve 18
In some cases, the seal rubber is simply installed in a groove provided on the outer peripheral surface of the cylindrical body 20 without being integrated with the cylindrical body 20.
It is also effective to provide a ring-shaped protrusion integrally on the outer circumferential surface of the art eye 14 to achieve a stronger pressure bond with the inner wall surface of the art eye 14, thereby achieving a seal.
It is Noh.

However, the present invention may include various modifications based on the knowledge of those skilled in the art without departing from the spirit thereof.
It is possible to add ``i'', etc.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a pension arm eye showing an example of a bushing according to the present invention, FIG. 2 is a left side view thereof, and FIG. 3 is a single bushing that is the main component of such a bushing. FIG. 4 is a cross-sectional view taken along the line ■-■ in FIG. 3. Further, FIGS. 5, 6, and 7 are longitudinal sectional views of the constituent members of the bushing shown in FIGS. 3 and 4,
Fig. 5 shows the cross section of the rubber sleeve and the cylindrical body, and Fig. 6 shows the cross section of the rubber sleeve and the cylindrical body.
The figure shows a cross section of the inner cylindrical metal fitting, and FIG. 7 shows a cross section of the sliding sleeve and metal sleeve. Furthermore, FIG. 8 is a partially cutaway view corresponding to FIG. 2 showing an example of the bushing according to the present invention, and FIG. 9 is a sectional view of IIIX in FIG. 8. FIG. 10 is a diagram corresponding to FIG. 9 showing still another embodiment of the present invention. 12: Sanupension arm 14: Arm eye 16: Push unit 18: Rubber sleeve 20: Cylindrical body 22: Inner cylindrical metal fitting 24: Lubrication cleave 26: Metal sleeve 28: Recess 80.54: Communication hole 32: Window 34: Four parts 36 ; Seal rubber part 40: protrusion
42: Groove 44° 46: Large diameter portion 50: Incompressible fluid 52: Yorito Mizode Toyota Motor Corporation Tokai Rubber Industries, Ltd. Figure 6 Figure 7

Claims (5)

[Claims] (1) a cylindrical inner member; a cylindrical outer member spaced radially outwardly from the inner member and located concentrically therearound; an annular resilient portion disposed therebetween having a plurality of distinct recesses in an outer surface thereof and having distinct pockets defined by the inner wall of the outer member and the recesses; a cylindrical rigid member fixed to the outer circumferential surface of the member and having a window portion corresponding to each recess of the elastic member in contact with the inner wall of the outer portion (1) iJ, i′ [ 2) a next communication path that connects the plurality of pockets; 1) a predetermined incompressible fluid sealed in the plurality of pockets; and the inner member and a predetermined fluid inserted into the inner member. A shark pension bush structure characterized by comprising: a sliding mechanism provided between a pivot supported by a member and allowing sliding around the axis between the pivot and the inner member. . (2) A patent in which the sliding mechanism includes a rigid sleeve into which the pivot shaft is inserted, and a lubricating sleeve made of a self-lubricating material with low friction and disposed between the rigid sleeve and the inner member. Claim [1] Sanupension butunyu structure according to claim 1. (3) located between the rigid part attachment and the outer member,
2. The Sanupension Butunyu structure according to claim 1, further comprising a sealing means for preventing the fluid sealed in the pocket portion from leaking between the pocket portions. (4) The shark pension bush structure according to claim 1, wherein a communication path for communicating the plurality of pocket portions is provided in the rigid member. (5) r'+: The suspension according to any one of claims 1 to 5, wherein the outer member is a cylindrical member fixed to an end of a suspension member in a vehicle suspension system. Push structure.