JPH05301511A - Stabilizer bush for vehicle - Google Patents

Abstract

PURPOSE:To reduce frictional resistance of a slide surface and to improve productivity by a method wherein a stabilizer bush for a vehicle made of rubber having the slide surface forms a bristle-filled surface. CONSTITUTION:The slide surface of a stabilizer bush 1 made of rubber forms a bristle-filled surface 3A. In this case, short fibers having a fiber length of approximate 0.1-4.0mm and a fiber size of approximate 5-35 pts.wt. are blended as the short fibers of the bristle-filled surface 3A. When a fiber length is too short, the bristle-filled surface 3A is difficult to form and when it is too long, dispersibility in a rubber blended substance is worsened and as a result, the bristle-filled surface 3A is difficult to form. When it is too large, fatigue resistance of rubber is lowered. Further, when a blending amount of the short fibers is 5 pts.wt. or less, the bristle-filled surface 3A is difficult to form and even when it exceeds 30 pts.wt., the slide resistance reduction effect of the bristle- filled surface 3A is not increased and besides molding in a state that short fibers are exposed to the whole of a molded product is apt to occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber vehicle stabilizer bush having a sliding surface, and more particularly to a rubber bush used for attaching a stabilizer in a vehicle suspension to a vehicle body or a suspension.

[0002]

2. Description of the Related Art A conventional stabilizer bush 1 has, for example, the structure shown in FIG.
-180619).

A cylindrical body composed of an inner peripheral surface 3 for holding the stabilizer bar 11 and an outer peripheral surface 5 formed in the axial direction so as to have a flat surface 5a for attachment to the suspension or the vehicle body sheet metal 13, It was made of all rubber. In this mounting mode, the outer peripheral surface 5 is held by using the clamp 15 while the stabilizer bar 11 is inserted and held in the inner peripheral surface 3 of the bush 1.
5 was fixed to the metal plate 13 of the vehicle body by a fastener 17 such as a bolt or nut. At this time, the stabilizer bar 11
Is held slidably, that is, rotatably, on the inner peripheral surface 3 of the bush 1 when receiving for twisting.

[0004]

Recently, it has been found that reducing the torsional torque when the stabilizer bar is subjected to the torsional effect is effective in improving the riding comfort of the vehicle. However, even if an attempt is made to reduce the twisting torque of the stabilizer bar, the stabilizer bar 11 and the bush 1 have a high friction coefficient due to the metal-rubber contact, and it is difficult to reduce the twisting torque.

Therefore, it is conceivable to loosen the fitting of the stabilizer bar 11 to the bush 1 to reduce the torsion torque of the stabilizer bar, but this time, the spring constant of the bush becomes unstable and the running stability is adversely affected. Not desirable.

Therefore, in order to solve the above problems, the sliding surface (usually the inner peripheral surface) of the bush is formed by the hard resin ring portion 7 having a small friction coefficient with respect to the stabilizer bar, that is, the hard resin ring portion 7 A structure having a structure shown in FIG. 4 and including a rubber main body 9 has been proposed (Japanese Laid-Open Patent Publication No. Sho 63-63).
-57311 gazette etc.).

[0007]

However, in the case of the stabilizer bush having the above structure, the material of the resin ring portion 7 is
It is necessary to use a resin that is special (expensive) and not easy to mold (ultra high density polyethylene or fluororesin), and
It was necessary to mold the resin ring portion 7 separately. Therefore, the manufacturing cost is increased as a whole.

In view of the above, it is an object of the present invention to provide a stabilizer bush for a vehicle, which does not require the use of a special material in order to reduce the frictional resistance of the sliding surface and has good productivity. is there.

[0009]

A stabilizer bush for a vehicle according to the present invention solves the above problems by the following constitution.

In a rubber stabilizer bush having a sliding surface, the sliding surface is a flocked surface.

[0011]

EXAMPLES In order to better understand the present invention, examples will be described below. The same parts as those of the conventional example are designated by the same reference numerals, and the whole or part of the description thereof will be omitted.

As shown in FIGS. 1 and 2, the inner peripheral surface serving as a sliding surface is a flocked surface 3A. The stabilizer bush is usually manufactured by the following method.

(1) By mixing short fibers in the rubber compound,
It is molded by extrusion, injection, or transfer.

The above-mentioned rubber material is not particularly limited as long as it is a material having a good vibration damping property. Usually, natural rubber (NR),
A blend rubber of NR and butadiene rubber (BR), styrene butadiene rubber (SBR), or ethylene propylene rubber is used.

The above short fibers have a fiber length of 0.1 to 4.0.
mm, fiber thickness 1-10d, rubber polymer 100
5 to 35 parts by weight are mixed with respect to parts by weight. If the fiber length is too short, it is difficult to form a flocked surface, and if the fiber length is too long, the dispersibility in the rubber compound is deteriorated, and as a result, it is difficult to form a flocked surface. Further, if the fiber thickness is too thin, it is difficult to form a flocked surface, and if it is too thick, the fatigue resistance of the rubber decreases. Furthermore, if the amount of the short fibers is less than 5 parts, it is difficult to form the flocked surface, and even if it exceeds 30 parts, the sliding resistance reduction effect of the flocked surface does not increase, and moreover, it is short for the entire molded article. The fibers are exposed and easily molded.

Further, the material of the single fiber is not particularly limited as long as it is a fiber having a good slip such as polyester, polyamide, aromatic polyamide, acrylic, and fluorine fiber.

(2) The inner peripheral surface (sliding surface) of the rubber molded product molded as described above is buffed to expose the short fibers to form a flocked surface. This exposure length is 0.1 to 1.0 mm.

The stabilizer bush thus formed is used by attaching it to the sheet metal of the vehicle body by holding the stabilizer bar on the inner peripheral surface and holding the outer peripheral surface by the U-shaped clamp as in the conventional case.

At this time, the stabilizer bar is subjected to a twisting action, but the stabilizer bar has a sliding surface as a flocked surface, so the twisting torque of the stabilizer bar does not become high and the riding comfort is good. As a matter of course, the bush and the stabilizer bar are not loosely fitted to each other, so that the running stability of the vehicle is good.

In the above embodiment, the case where the inner peripheral surface of the bush is the sliding surface is taken as an example, but the outer peripheral surface or the intermediate surface of the bush may be the sliding surface.

In order to easily attach the bush to the stabilizer bar, as described in the above-mentioned Utility Model Publication,
It may be cut into pieces.

[0022]

Since the sliding surface of the stabilizer bush of the present invention is a flocked surface as described above, when the stabilizer bar is twisted, the stabilizer bar exerts a large resistance from the sliding surface. Without receiving, the torsion torque of the stabilizer bar does not increase much. Therefore, the riding comfort of the vehicle is improved. Further, unlike the conventional case, in order to reduce the frictional resistance of the sliding surface, it is not necessary to separately form the hard resin ring portion by using a special (expensive) material that is not easily moldable, and simply, It can be manufactured simply by buffing the sliding surface of a rubber molded product. Therefore, it is possible to manufacture a stabilizer bush having a small frictional resistance on the sliding surface with good productivity and at low cost as compared with the conventional one.

[0023]

[Test Example] A test example conducted to confirm the effect of the present invention will be described below.

In the following basic mixture formulation, each short fiber having the indicated specifications is mixed in the indicated amount to form a cylindrical body (30 mmφ × 12.5 mm
h) is compression molded (molding conditions: 160 ° C. × 15 min),
One side was buffed to prepare a test piece as a flocked surface. Then, with the flocked surface of each test piece facing down, the weight of the display (N)
Was put on a clean acrylic plate, and the force (F) during its movement was measured. And friction coefficient (μ = F / N)
Is calculated and the results are displayed. It is understood that the friction coefficient of each of the test pieces having the flocked surface is significantly smaller than that of the test piece having no flocked surface. Disposition method (unit: parts by weight ) NR 60 BR 40 Zinc oxide 5 Stearic acid 1 MAF black 30 Anti-aging agent 3 Vulcanization accelerator 1 Powdered sulfur 2 Short fiber variable

[0025]

[Table 1]

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a stabilizer bush of the present invention,

2 is a partial cross-sectional view of the sliding surface portion of FIG.

FIG. 3 is a perspective view showing an example of a conventional stabilizer bush,

FIG. 4 is a cross-sectional view showing a mounting mode of a stabilizer bush,

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Stabilizer bush, 3 ... Inner peripheral surface (sliding surface), 3A ... Flocking surface (sliding surface), 7 ... Hard resin ring part, 9 ... Rubber main body part, 11 ... Stabilizer bar.

Claims (1)

[Claims] 1. A stabilizer bush for a vehicle, comprising a sliding surface made of rubber, wherein the sliding surface is a flocked surface.