JPH1182625A - Stabilizer bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the rigidity of a stabilizer bush in the vehicular lateral direction, increase the durability by preventing the occurrence of the shift of a slit and the crack of a rubber and prevent the shift of a rubber vibration isolator from a bracket. SOLUTION: A rubber vibration isolator body 1 having a nearly U shape for constituting a stabilizer bush holds the outer periphery surface between the flanges 12 of both ends in a nearly U shaped bracket. A resin made reinforcement member 3 extending to the axial direction along the holding hole 11 of a stabilizer bar is buried in the rubber vibration isolator body 1, whose both ends are formed into reinforcement rims 31 whose both sides are bent outward in the diametral direction and extended in the flange 12 and whose end edge is projected from the outer periphery edge of the flange 12. Thereby, the rigidity of the flange 12 is increased and the rigidity of the vehicular lateral direction is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a stabilizer bush for holding a stabilizer bar of a vehicle.

[0002]

2. Description of the Related Art As shown in FIGS. 5 (a) to 5 (c), in a vehicle suspension, a stabilizer bush B for supporting a stabilizer bar S on a vehicle body side is made of a thick-walled cylindrical anti-vibration rubber body 1. The stabilizer bar S is inserted and held therein. Flange portions 12 are provided at both ends of the vibration-proof rubber body 1, and an outer peripheral surface between the flange portions 12 is held in a substantially U-shaped bracket 2 fixed to a vehicle frame (not shown). The flat top surface 13 (FIGS. 5B and 5C) of the vibration-proof rubber body 1 is in contact with a mounting surface of a vehicle body frame to which the bracket 2 is mounted. A cut 14 extending from the inner circumference to the outer circumference is provided at the top of the vibration-proof rubber body 1 over the entire length in the axial direction (FIG. 5A). The cut 14 is opened to open the outer circumference of the stabilizer bar S. It is designed to be mounted on.

[0003]

However, in the above-mentioned conventional stabilizer bush structure, since the bracket 2 does not hold the entire outer peripheral surface of the vibration isolating rubber body 1, its spring characteristic is low, and the entire stabilizer is not provided. There was a possibility that the spring characteristics would be reduced. In order to improve this, for example, it is conceivable to increase the diameter of the stabilizer bar S, but this has a negative effect on the weight reduction of the vehicle. Alternatively, it is also effective to increase the rigidity of the stabilizer bush B in the vertical direction. As a configuration for this purpose, a structure in which an insert member is provided in the vibration-proof rubber body 1 is known (for example, Japanese Patent Laid-Open No. No. 4-316729, Japanese Utility Model Laid-Open No. 6
JP-A-3-4707, JP-A-62-98844,
Japanese Utility Model Laid-Open No. 1-135243, etc.).

However, even in this configuration, the rigidity of the vibration isolating rubber body 1 in the left-right direction of the vehicle is insufficient, and therefore, there are the following problems. In other words, in recent years, in order to make the relative rotation between the stabilizer bush B and the stabilizer bar S good, the vibration isolating rubber body 1 is made of a highly slidable rubber material. B easily slides sideways relative to the stabilizer bar S. On the other hand, since the stabilizer bush B is usually disposed near the bent portion S1 (FIG. 5A) of the stabilizer bar S, the stabilizer bush B may slip sideways and be pushed up to the bent portion S1. At this time, if the rigidity of the vibration isolating rubber body 1 in the vehicle left-right direction is low, there is a possibility that the lateral force may cause a shift in the slit 14 or a crack may occur in the flange portion 12, resulting in a decrease in durability. there were. In addition, there is a problem that the vibration isolating rubber body 1 is displaced with respect to the bracket 2 and the holding performance is reduced.

SUMMARY OF THE INVENTION Accordingly, the present invention increases the rigidity of the stabilizer bush, particularly in the lateral direction of the vehicle, to prevent the split portion from being displaced and to prevent the flange portion from being cracked. It is an object of the present invention to obtain a stabilizer bush which is excellent in durability and reliability by preventing the deviation from being displaced.

[0006]

According to the first aspect of the present invention, the stabilizer bush is formed as a holding hole for a stabilizer bar in the cylindrical vibration-isolating rubber body, and projects radially from both ends of the rubber vibration-isolating body. A flange portion is provided, and an outer peripheral surface of the vibration isolating rubber body between the flange portions is held in a substantially U-shaped bracket fixed to a vehicle body mounting surface, and a top of the vibration isolating rubber body not in contact with the bracket is provided. The surface is flat and is in contact with the mounting surface. A resin reinforcing member extending in the axial direction along the holding hole is embedded at least at positions above and below the holding hole in the vibration-proof rubber body, and both ends of the reinforcing member are at least A part thereof is bent radially outward and extends into the flange portion, and an end edge is a reinforcing rib projecting from the outer peripheral edge of the flange portion.

[0007] According to the above configuration, since the reinforcing ribs are embedded in the flange portions provided at both ends of the vibration isolating rubber body,
The rigidity of the flange is greatly improved. Therefore, even if the stabilizer bush slides sideways and comes into contact with the bent portion of the stabilizer bar, cracks and the like are unlikely to occur, and the durability is improved. In addition, it is possible to prevent the vibration-proof rubber body from being displaced from the bracket, and the holding ability is greatly improved. Further, the reinforcing member continuous with the reinforcing rib improves the rigidity of the vibration-proof rubber body in the vertical direction, so that the spring characteristics are improved. And
Since the reinforcing members and the reinforcing ribs are made of a lightweight resin, it is possible to secure necessary characteristics as a stabilizer without significantly increasing the weight, and to improve the steering stability.

According to the second aspect of the present invention, the stabilizer bush has a notch for attaching a stabilizer bar extending from the holding hole to the outer peripheral surface of the vibration isolating rubber body. The effect of the reinforcing member is particularly effectively exhibited when the stabilizer bush has a slit, and the effect of the reinforcing rib can prevent the shift of the slit.

According to a third aspect of the present invention, the reinforcing member has a substantially cylindrical shape, and has a flat shape in which the diameter in the vehicle longitudinal direction is larger than the diameter in the vehicle vertical direction. At this time, in the longitudinal direction of the vehicle,
Since the vibration isolating rubber body on the inner peripheral side of the reinforcing member becomes sufficiently thick and soft, the riding comfort can be ensured. In addition, it can be absorbed by the elastic deformation of the rubber when the stabilizer bar is pushed up.

According to a fourth aspect of the present invention, instead of the reinforcing member, a resin reinforcing plate having a substantially U-shape and an outer peripheral edge protruding from the outer peripheral edge of the flange portion is embedded in both end portions of the rubber vibration insulator. The inner peripheral edge is bent inward in the axial direction to form a reinforcing rib. When rigidity in the vertical direction of the vehicle is not particularly required, reinforcing plates may be provided only at both ends of the vibration-isolating rubber body, and the same effect of preventing lateral displacement of the stabilizer bar, displacement from the bracket, and the like can be obtained. can get.

[0011]

1 (a) and 1 (b) show an embodiment of the present invention. In the figure, the stabilizer bush is made of a thick-walled tubular vibration-isolating rubber body 1 and its inside is formed as a holding hole 11 for a stabilizer bar. The anti-vibration rubber body 1 is formed in a substantially U-shaped cross section having a top surface 13 as a plane, and a flange portion 12 is formed at both ends thereof by projecting an outer peripheral edge in a radial direction. And these flange parts 1
2, the outer peripheral surface between the mounting surface F of the vehicle frame (FIG. 1)
(B)) is held by a substantially U-shaped bracket 2 fixed by bolts, and the top surface 13 is in contact with the mounting surface F.

At the top of the vibration isolating rubber body 1, a cut 14 extending from the holding hole 11 to the outer peripheral surface is formed over the entire length in the axial direction. The slit 14 is opened, attached to the outer periphery of the stabilizer bar, and held in the holding hole 11 so as to be relatively rotatable. The rubber material forming the vibration-proof rubber body 1 is not particularly limited,
If it is made of a highly slidable rubber material, for example, a rubber material containing a higher fatty acid amide, the slidability of the stabilizer bar S which rotates relative to the vibration-proof rubber body 1 is improved.

A substantially cylindrical reinforcing member 3 is embedded in the vibration isolating rubber body 1 concentrically. The reinforcing member 3 is made of a resin, for example, a polyamide resin such as nylon, and has a flat shape in which the diameter in the vehicle longitudinal direction is larger than the diameter in the vehicle vertical direction. More specifically, in the vehicle front-rear direction, the reinforcing member 3 is disposed at substantially the middle position of the thickness of the vibration-isolating rubber body 1 in the vehicle longitudinal direction. It is preferable to appropriately set the respective diameters so that the thickness of the first member becomes sufficiently large. The resin material constituting the reinforcing member 3 may be a polyphenylene ether resin or the like in addition to the polyamide resin, or a fiber reinforced resin in which glass fibers or the like are dispersed in these resins.

Both end portions of the reinforcing member 3 reach both end portions of the vibration isolating rubber body 1, and both side portions (side portions in the vehicle front-rear direction) are bent radially outward to form the flange portion. 12
And a reinforcing rib 31 is formed. The edges of the reinforcing ribs 31 protrude from the outer peripheral edge of the flange portion 12.

When manufacturing the stabilizer bush having the above-mentioned structure, the reinforcing member 3 previously formed into a predetermined shape is usually arranged in a molding die, and the rubber material constituting the vibration-proof rubber body 1 is injection-molded. . The bonding between the reinforcing member 3 and the vibration-isolating rubber body 1 usually does not use an adhesive.
In order to provide the anchoring effect, the reinforcing member 3 is desirably subjected to a pretreatment such as roughening the surface, or is formed with large irregularities or through holes, thereby improving the bonding property. However, even when an adhesive is not used, if the reinforcing member 3 is made of a polyphenylene ether-based resin and styrene or the like is added to the rubber material forming the vibration-isolating rubber body 1, the two can be bonded to each other. . The slit 14 is formed after molding, and the anti-vibration rubber member 1 and the reinforcing member 3 are cut at the slit 14 forming portion.

According to the above configuration, the rigidity of the vibration isolating rubber body 1 is improved by the reinforcing member 3, and the rigidity of the flange portion 12 is greatly improved by the reinforcing ribs 31 at both ends. Therefore, even if the stabilizer bush slides laterally and comes into contact with the bent portion of the stabilizer bar and receives a lateral force, a shift in the portion of the cutout 14 is less likely to occur, and the generation of cracks is prevented and the durability is improved. The flange 12
Functions as a stopper, so that the vibration-proof rubber body 1 can be prevented from being displaced from the bracket 2.

Furthermore, since the rigidity in the vertical direction is greatly improved by the reinforcing member 3, the spring characteristics are improved. In addition, since the reinforcing member 3 and the reinforcing rib 31 are made of a lightweight resin, the required characteristics of the stabilizer can be secured and the steering stability can be improved without greatly increasing the weight. In addition, since the reinforcing member 3 has a large rubber volume in the vehicle front-rear direction with respect to the vehicle vertical direction, the rubber is softened by this amount, so that the riding comfort can be secured, and it is easy to come into contact with the bent portion of the stabilizer bar when the vehicle slides sideways. By securing the rubber volume in the vehicle front-rear direction, it is possible to absorb distortion caused by contact with the stabilizer bar.
In addition, since the reinforcing member 3 has a flat shape and the reinforcing ribs 31, positioning during molding becomes easy,
Setability in the mold is also improved.

FIGS. 2A to 2C show a second embodiment of the present invention. The reinforcing member 3 does not need to be provided on the entire outer periphery of the holding hole 11, and
It may be formed at the upper and lower positions. In the present embodiment, the top and bottom portions of the vibration-isolating rubber body 1 are each made of a resin material to form the reinforcing members 3a and 3b, and no reinforcing member is provided in the vehicle longitudinal direction. Both ends in the axial direction of the reinforcing members 3a, 3b are bent radially outward and extend into the flange portion 12, and the reinforcing ribs 31a, 31 project from the outer peripheral edge of the flange portion 12.
b. The lower surface of the reinforcing member 3a and the upper surface of the reinforcing member 3b are formed in a curved shape along the holding hole 11. In this case, the slit 14 is formed by the reinforcing members 3a, 3
It is preferable to provide b in a portion where it is not provided.

According to the above configuration, since the reinforcing member 3 is provided only in the vertical direction of the vehicle, the rigidity in the longitudinal direction of the vehicle is reduced, and the riding comfort is improved. The effect of improving the spring characteristics by increasing the rigidity in the vehicle vertical direction and the effect of the reinforcing ribs 31a and 31b at both ends are the same as in the first embodiment.

FIG. 3 shows a third embodiment of the present invention. When there is no need to consider the contact with the stabilizer bar or the thickness in the vehicle longitudinal direction, the reinforcing member 3 is used. May be cylindrical. The reinforcing member 3 forms a reinforcing rib 31 that bends only an edge in the vehicle front-rear direction at an axial end and extends into the flange portion 12 and protrudes from an outer peripheral end of the flange portion 12.

According to the above structure, the rigidity in the vertical direction of the vehicle can be improved with a simple structure, and the effect of improving the rigidity of the flange portion 12 by the reinforcing rib 31 can be obtained. In this configuration, the reinforcing member 3
If the inner vibration-isolating rubber body 1a is made of a highly slidable rubber and the outer vibration-isolating rubber body 1a is made of a natural rubber material, the friction coefficient on the outer peripheral side is greatly increased. The effect of preventing the displacement is high, and the slidability of the stabilizer bar can be maintained. At this time, it is preferable that the reinforcing member 3 does not have a through hole or the like so that the lubricant in the highly slidable rubber does not migrate to the outer peripheral side.

FIG. 4 shows a fourth embodiment of the present invention.
If rigidity in the vertical direction of the vehicle is not particularly required, a reinforcing member may be provided only at both ends of the rubber vibration insulator 1. In the drawing, a resin reinforcing plate 4 having a substantially U shape and having an outer peripheral edge projecting from the outer peripheral edge of the flange portion 12 may be embedded in both end portions of the vibration-proof rubber body 1. The inner peripheral edge of the reinforcing plate 4 is bent inward in the axial direction to form a reinforcing rib 41. At this time, by the effect of the reinforcing plate 4 and the reinforcing rib 41, similarly, it is possible to prevent a decrease in the durability due to the side slip of the stabilizer bar, a shift of the vibration isolating rubber body 1 from the bracket, and the like.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view of a stabilizer bush in a vehicle left-right direction, and FIG.

FIGS. 2A and 2B show a second embodiment of the present invention, wherein FIG. 2A is a top view of a stabilizer bush, FIG. 2B is a cross-sectional view in the vehicle front-rear direction, and FIG. 2B is a side cross-sectional view of the stabilizer bush. is there.

FIG. 3 is a cross-sectional view of a stabilizer bush in a vehicle front-rear direction according to a third embodiment of the present invention.

4A and 4B show a fourth embodiment of the present invention, wherein FIG. 4A is a cross-sectional view of a stabilizer bush in a vehicle front-rear direction, and FIG. 4B is a cross-sectional view taken along line AA of FIG.

FIG. 5A is a view showing a mounting state of a conventional stabilizer bush, FIG. 5B is a cross-sectional view of the conventional stabilizer bush in a vehicle longitudinal direction, and FIG. 5C is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration-proof rubber body 11 Holding hole 12 Flange part 13 Top surface 14 Splitting 2 Bracket 3 Reinforcement member 3a, 3b Reinforcement member 31 Reinforcement rib 31a, 31b Reinforcement rib 4 Reinforcement plate 41 Reinforcement rib

Claims (5)

[Claims] 1. A cylindrical anti-vibration rubber body is formed as a holding hole for a stabilizer bar, and a flange portion is provided which protrudes radially from both ends of the anti-vibration rubber body. A stabilizer bush whose peripheral surface is held in a substantially U-shaped bracket fixed to a vehicle body mounting surface, and a top surface of the vibration isolating rubber body that is not in contact with the bracket is made flat and abuts on the mounting surface. In at least the vibration isolating rubber body above and below the holding hole, a resin-made reinforcing member extending in the axial direction along the holding hole is embedded, and at least a part of the reinforcing member at both ends of the reinforcing member. A stabilizer bush, which is bent outward in the radial direction and extends into the flange portion, and an edge of the stabilizer bush protrudes from an outer peripheral edge of the flange portion. 2. The stabilizer bush according to claim 1, further comprising a cutout for mounting a stabilizer bar extending from the holding hole to an outer peripheral surface of the vibration-proof rubber body. 3. The stabilizer bush according to claim 1, wherein the reinforcing member has a substantially cylindrical shape, and has a flat shape whose diameter in the vehicle front-rear direction is larger than the diameter in the vehicle vertical direction. 4. The stabilizer bush according to claim 1, wherein the reinforcing member has a substantially cylindrical shape, and the anti-vibration rubber body on the inner peripheral side is made of highly slidable rubber. 5. A cylindrical anti-vibration rubber body is formed as a holding hole for a stabilizer bar, and a flange portion is provided which protrudes radially from both ends of the anti-vibration rubber body. A stabilizer bush whose peripheral surface is held in a substantially U-shaped bracket fixed to a vehicle body mounting surface, and a top surface of the vibration isolating rubber body that is not in contact with the bracket is made flat and abuts on the mounting surface. , A resin reinforcing plate having a substantially U-shape and an outer peripheral edge protruding from the outer peripheral edge of the flange portion is embedded in both end portions of the rubber vibration insulator, and the inner peripheral side edge is bent inward in the axial direction. A stabilizer bush characterized by being made into a reinforcing rib.