JPH08277869A - Bush - Google Patents

Abstract

PURPOSE: To prevent the side slip of a stabilizer bar insert-held in a stabilizer bush and to prevent the generation of noise caused by the interference with other members. CONSTITUTION: A bush is provided with a sliding part 2 formed by insert-holding a stabilizer bar in a cylindrical vibration-proof rubber body 1 and jointing material with high sliding property to the periphery of the vibration-proof rubber body 1 so as to cover it. Flanges 21 projecting radially from both axial edges of the sliding part 2 are provided, and the bush is fixed to a base body F by brackets 31, 32 holding the peripheral surface of the sliding part 2 between the flanges 21. Since the vibration-proof rubber body 1 is cylindrical, the surface pressure is uniformly applied to the stabilizer bar, and the stabilizer bar is positively held and fixed to prevent a side slip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush applied to a stabilizer bush or the like.

[0002]

2. Description of the Related Art In the vehicle suspension shown in FIG. 5, a stabilizer bush B is provided to hold a stabilizer bar S whose both ends are connected to a lower arm A1 of the suspension. As shown in FIGS. 6A and 6B, the stabilizer bush B has a substantially U-shaped top surface.
The antivibration rubber body 1 has a thick-walled tubular shape with a V-shaped cross section, and the stabilizer bar S of FIG. 5 is inserted and held in the cylinder of the antivibration rubber body 1. The anti-vibration rubber body 1 is
Both ends in the axial direction are radially extended to form a flange 11, and the peripheral surface between the flanges 11 is held by a U-shaped mounting bracket 3, and both ends of the bracket 3 are bolted to the vehicle frame F. It is fixed (Fig. 6 (C)).
In FIG. 5, A2 is an upper arm, C is a coil spring, and D is a shock absorber.

[0003]

By the way, in the above-mentioned conventional stabilizer bush B, the inner peripheral surface of the anti-vibration rubber body 1 and the stabilizer bar S are configured to be rotatable relative to each other. The bar S may slip and the relative position with respect to the stabilizer bush B may change. Therefore, the components of the suspension or the vehicle frame F and the stabilizer bar S
Could interfere with each other and generate abnormal noise.

As a countermeasure, for example, as shown in FIG. 7, a bush E for preventing lateral deviation is provided adjacent to the stabilizer bush B. However, a clamp E1 for fixing this is required, and the number of parts is increased. , The cost will increase significantly. For this reason, generally, as shown in FIG. 8, a stabilizer bush B is attached near the bent portion S1 of the stabilizer bar S so that the amount of side slip is minimized, but interference with other members is completely prevented. It was difficult to do.

SUMMARY OF THE INVENTION An object of the present invention is to prevent a stabilizer bar inserted through and held by a stabilizer bush from lateral slippage and prevent generation of abnormal noise due to interference with other members.

[0006]

As shown in FIG. 1, a bush according to the present invention has a cylindrical vibration-proof rubber body 1 through which a shaft is inserted and held, and a high sliding force on the outer circumference of the vibration-proof rubber body 1. And a sliding portion 2 formed by adhering and bonding a conductive material, and provided with flanges 21 projecting radially from both axial ends of the sliding portion 2, and the circumference of the sliding portion 2 between the flanges 21. It is characterized in that it is fixed to the base F by brackets 31 and 32 for holding the surfaces (claim 1).

The sliding portion 2 may have a structure in which a large number of irregularities are formed on the peripheral surface 22 between the flanges 21 (FIG. 2, FIG.
Claim 2). Examples of the slidable material include a rubber material containing an unsaturated fatty acid amide or an N-substituted unsaturated fatty acid amide (Claim 3).
It is also possible to interpose a reinforcing metal plate 4 between the sliding part 2 and the sliding part 2 (FIG. 3, claim 4).

[0008]

In the bush of the present invention, the shaft member is held and fixed in the anti-vibration rubber body 1, and the outer periphery of the bush member is covered with the highly slidable material to form the sliding portion 2. In the above configuration, since the vibration-proof rubber body 1 has a cylindrical shape, the shaft body inserted and held by the vibration-proof rubber body 1 is uniformly subjected to surface pressure, and the holding force of the shaft body is improved to prevent the vibration-proof rubber body 1 from coming off. To prevent. Since the sliding portion 2 that rotates relative to the brackets 31, 32 is made of a highly slidable material, the frictional resistance with the inner peripheral surfaces of the brackets 31, 32 is small, and the generation of friction noise and the deterioration of the material due to friction. Suppress. Moreover, since the flange 21 functions as a stopper,
The sliding portion 2 is displaced only in the rotational direction and does not slide sideways. Thus, the shaft body is securely held and the generation of abnormal noise due to interference with other members is prevented.

[0009]

1 (A) and 1 (B) show an embodiment in which the present invention is applied to a stabilizer bush, which is composed of a thick vibration-proof rubber body 1 formed in a cylindrical shape and the vibration-proof rubber body. 1 and a sliding portion 2 formed on the outer periphery of the same. The anti-vibration rubber body 1 is usually made of a natural rubber material, and a stabilizer bar, which is not shown, is inserted and held in the cylinder thereof.

The sliding portion 2 is formed by adhering and bonding a highly slidable material with a constant width on the entire outer circumference of the vibration-proof rubber body 1.
Its peripheral surface is rotatable relative to a mounting bracket described later. Examples of the highly slidable material include rubber materials containing unsaturated fatty acid amide or N-substituted unsaturated fatty acid amide. At this time, the content of the unsaturated fatty acid amide or the N-substituted unsaturated fatty acid amide is usually in the range of 1 to 20% by weight.

Both ends of the sliding portion 2 in the axial direction are formed with flanges 21 by radially extending the outer peripheral edges thereof. The peripheral surface between the flanges 21 is provided with a pair of brackets 31 and 3 having semicircular portions 311 and 321 along the peripheral surface.
It is sandwiched between two (FIG. 1 (C)), and the brackets 31 and 3 are
The upper side of 2 is bolted to the vehicle frame F, which is a base.

In FIG. 1B, the stabilizer bush is provided with a slit 51 extending in the axial direction from the inner circumference of the vibration-proof rubber member 1 to the outer circumference of the sliding portion 2. The stabilizer 51 is opened by opening the slit 51. It is designed to be attached to a bar.

In the above structure, the stabilizer bar is held and fixed in the cylinder of the vibration isolating rubber body 1, the sliding portion 2 is provided on the outer periphery of the vibration isolating rubber body 1, and the peripheral surface of the sliding portion 2 and the bracket 31 are provided. ,
The semicircular portions 311 and 321 of 32 are adapted to rotate relative to each other. At this time, since the anti-vibration rubber body 1 has a cylindrical shape, when it is fixed by the brackets 31 and 32,
A surface pressure is applied to the stabilizer bar more uniformly than the inner peripheral surface of the anti-vibration rubber body 1, the holding force is improved, and the stabilizer bar is prevented from coming off.

On the other hand, since the sliding portion 2 is made of a highly sliding material, the coefficient of friction with the inner peripheral surfaces of the brackets 31, 32 is small, deterioration of the material due to friction is suppressed, and durability is improved. Further, even if the sliding portion 2 is rapidly displaced, noise due to friction does not occur. Further, the flanges 21 at both ends of the sliding portion 2 restrict the movement of the sliding portion 2 in the axial direction, so that the brackets 31 and 32 are prevented from coming off. Thus, since the stabilizer bar is securely held and side slip does not occur, generation of abnormal noise due to interference with other members can be prevented.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, a large number of irregularities are formed on the peripheral surface 22 of the sliding portion 2 between the flanges 21. In the configuration of the present invention, since the sliding surface is provided on the outer peripheral side of the stabilizer bush, the area of the sliding surface is larger than that of the conventional structure in which the inner peripheral surface of the vibration-proof rubber body 1 is the sliding surface. If a large number of irregularities are provided on the peripheral surface 22 which is a sliding surface as in the embodiment, the bracket 3
The contact area with 1, 32 becomes small. Therefore, the frictional resistance is reduced, the slidability is further improved, and the risk of occurrence of abnormal noise can be further reduced.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, an interring 4 made of a pair of metal plates having a semicircular cross section is embedded between the antivibration rubber body 1 and the sliding portion 2. There is.
As a result, the rigidity of the anti-vibration rubber body 1 is increased, the surface pressure applied to the stabilizer bar is further increased, and side slip of the stabilizer bar is prevented. Further, if slits 52 are formed on both end surfaces of the sliding portion 2 at positions facing the slits 51 for mounting on the stabilizer bar, the slits 51 can be easily opened and the mountability when assembling the stabilizer bar is further improved. improves.

FIG. 4 shows a fourth embodiment of the present invention. As shown in the drawing, if the flange portions 41 that extend outward along the flange 21 are provided at both axial ends of the interring 4, the surface pressure applied to the stabilizer bar is further increased, and at the same time, the flange 21 The rigidity is improved, and the effect of preventing slippage is enhanced.

[0018]

As described above, when the present invention is applied to a bush such as a stabilizer bush for holding a shaft body in a vibration-proof rubber body, lateral slip of the shaft body can be prevented, and abnormal noise is generated due to interference with other members. Can be prevented.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (A) is a sectional view of a stabilizer bush, (B) is a side view of the stabilizer bush, and (C) is a view showing the stabilizer bush assembled to a vehicle frame. is there.

FIG. 2 is a sectional view of a stabilizer bush according to a second embodiment of the present invention.

3A and 3B show a third embodiment of the present invention, FIG. 3A is a sectional view of a stabilizer bush, and FIG. 3B is a side view of the stabilizer bush.

FIG. 4 shows a fourth embodiment of the present invention, (A) is a sectional view of a stabilizer bush, and (B) is a side view of the stabilizer bush.

FIG. 5 is a view showing a state in which a stabilizer bush is assembled to a stabilizer bar of a vehicle suspension.

6A is a cross-sectional view of a conventional stabilizer bush, FIG. 6B is a side view thereof, and FIG. 6C is a view in which the conventional stabilizer bush is assembled to a vehicle frame.

FIG. 7 is an enlarged view of a main part showing an example of an assembled state of a conventional stabilizer bush.

FIG. 8 is an enlarged view of a main part showing another example of an assembled state of a conventional stabilizer bush.

[Explanation of symbols]

 1 Anti-vibration rubber body 2 Sliding part 21 Flange 22 Circumferential surface 3 Mounting bracket 31, 32 Mounting bracket 311, 321 Semi-circular part 4 Interring (metal plate) 41 Slit part 51 Slit 52 Slit Suspension lower arm S Stabilizer bar B Stabilizer bush

Claims (4)

[Claims] 1. A cylindrical anti-vibration rubber body through which a shaft is inserted and held, and a sliding portion formed by adhering and joining a highly slidable material to the outer periphery of the anti-vibration rubber body. A bush characterized in that a flange is provided that extends radially from both axial ends of the moving part, and is fixed to the base body by a bracket that holds the peripheral surface of the sliding part between the flanges. 2. The bush according to claim 1, wherein a large number of irregularities are formed on a peripheral surface between the flanges of the sliding portion. 3. The bush according to claim 1, wherein the slidable material is a rubber material containing an unsaturated fatty acid amide or an N-substituted unsaturated fatty acid amide. 4. The bush according to claim 1, wherein a reinforcing metal plate is interposed between the anti-vibration rubber body and the sliding portion.