JPH058038U - Reciprocating sliding bearing material - Google Patents

Abstract

(57) [Summary] [Purpose] For sliding mechanisms such as shock absorbers,
Improved friction conditions between rod guide, piston rod, piston and inner cylinder. [Configuration] A sliding mechanism including a sliding member having one of an outer cylinder surface and an inner cylinder surface as a sliding surface and a shaft or a cylinder that relatively slides in contact with the sliding surface. Both end portions in the axial direction of the sliding surface of the member are formed into R-plane shapes.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reciprocating sliding bearing material, more specifically, in a sliding mechanism such as a shock absorber for an automobile including a piston rod, a rod guide, a piston and a cylinder, for example, between the rod guide and the piston rod and the piston and the inner cylinder. The bearing material for reciprocating sliding has improved friction conditions.

[0002]

[Prior Art]

 Conventionally, in a sliding mechanism such as a shock absorber for an automobile, an irregular load is applied from the lateral direction during operation, which causes the piston rod portion to bend and make an eccentric contact with the end portion of the sliding member. In addition, even in the piston part attached to the tip of the rod, due to the deflection of the rod, the end of the ring-shaped sliding member attached to the piston and the inner cylinder make eccentric contact, increasing the frictional resistance during sliding. There is.

In sliding mechanisms such as shock absorbers for automobiles, there are enlarged sectional views of the rod guide portion shown in FIG. 3 and the sliding member of the piston portion shown in FIGS. 4 and 5, respectively. .. However, in such a conventional sliding member, the piston rod 3 bends due to an irregular load when the shock absorber is actuated. Therefore, in the rod guide portion 4, the piston rod 3 and each sliding member are deformed. In the chamfered portion and the piston portion 5, there is a problem that the inner cylinder 2 and the chamfered portion of each sliding member are eccentrically contacted with each other, and the friction resistance when the shock absorber slides increases.

[0004]

[Problems to be solved by the device]

 As a result of research and development aimed at solving such a conventional problem, the present invention has revealed that if the chamfered portions at both ends of the sliding surface of the bearing are formed in an R shape, the rod guide, piston and inner cylinder are deviated. The present invention was established based on the knowledge that contact can be avoided.

[0005]

[Means for Solving the Problems]

 That is, the present invention relates to a sliding mechanism including a sliding member having one of an outer peripheral surface and an inner peripheral surface as a sliding surface and a shaft or a cylinder that makes relative sliding contact with the sliding surface. It is characterized in that both ends of the sliding member in the axial direction of the sliding surface are formed into an R surface shape.

Hereinafter, the structure and operation of the means of the present invention will be described with reference to the drawings.

1 and 2 are enlarged cross-sectional views of a piston rod portion and a piston portion of a shock absorber used in implementing the present invention, and FIG. 3 is a vertical cross-sectional view of a conventional shock absorber. 4 and 5 are enlarged cross-sectional views of the piston rod portion and the piston portion of FIG. 3, respectively. Reference numeral 1 is an outer cylinder, 2 is an inner cylinder, 3 is a piston rod, 4 is a rod guide, 5 is a piston, 6 is a guide bush, and 7 is a piston bush.

Next, a conventional device will be described with reference to FIG. 3 in order to explain the structure of the present invention.

First, in FIG. 3, the lower end portion of the outer cylinder 1 having the inner cylinder 2 housed therein is connected to the wheel side (not shown), and the upper end portion of the piston rod 3 is connected to the vehicle body side. The large diameter portion 4a of the stepped rod guide 4 is fitted to the upper end portion of the outer cylinder 1, and the small diameter portion 4b of the rod guide 4 is fitted to the upper end opening portion of the inner cylinder 2. A guide bush 6 is fitted on the inner surface of the rod guide 4 and is in sliding contact with the piston rod 3. A piston bush 7 is mounted on the outer peripheral surface of the piston 5 and is in sliding contact with the inner cylinder 2.

As shown in FIG. 4 by enlarging the rod guide portion 4 of FIG. 3, when an irregular load is applied to the piston rod 3 in the vertical direction during operation in the shock absorber for an automobile, this causes the piston rod 3 to move. 3 is curved with the upper end 3a of the piston rod and the piston 5 as fulcrums. Due to this curved deformation, the piston rod 3 and the upper end 6a of the guide bush slide while sliding in an eccentric contact. FIG. 1 shows an embodiment of the present invention, in which the curved surfaces of the piston rod 3 and the guide bush ends 6a and 6b are provided with an R-shaped shape so that the sliding contact can be eliminated. Friction resistance during movement is reduced. Further, in FIG. 5, since the piston 5 is inclined due to the bending of the piston rod 3, the piston bush 7 makes an eccentric contact with the inner cylinder 2, but as shown in FIG. 2, both ends 7a, 7b of the piston bush are also guided. Further synergistic effect can be expected when the R-face shape similar to that of No. 6 is used.

[0011]

[Effect of the device]

 As described in detail above, the present invention includes a sliding member having one of the outer peripheral surface and the inner peripheral surface as a sliding surface, and a shaft or a cylinder that makes relative sliding contact with the sliding surface. In the sliding mechanism, both end portions in the axial direction of the sliding surface of the sliding member are formed into R-plane shapes.

Therefore, according to the present invention, even if an irregular load is applied during the operation of a shock absorber or the like and the shaft is deformed, the R-shape of the sliding member causes the sliding shaft and the sliding member to be biased. Without contact, the frictional resistance during operation will be small, and the effect of stabilizing the riding comfort of the car will be obtained. By eliminating the uneven contact, uneven wear is mitigated and the durability of the shock absorber is improved.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a piston rod portion of a shock absorber used when implementing the present invention.

FIG. 2 is an enlarged sectional view of a piston portion of a shock absorber used when implementing the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional shock absorber.

FIG. 4 is an enlarged cross-sectional view of the piston rod portion of FIG.

5 is an enlarged cross-sectional view of the piston portion of FIG.

[Explanation of symbols]

 1 Outer cylinder 2 Inner cylinder 3 Piston rod 4 Rod guide 5 Piston 6 Guide bush 7 Piston bush

Claims (1)

[Claims for utility model registration] Claims: 1. A sliding member having an outer peripheral surface or an inner peripheral surface as a sliding surface, and a shaft or a cylinder that makes relative sliding contact with the sliding surface. In the sliding mechanism including the above, a reciprocating sliding bearing material is characterized in that both end portions in the axial direction of the sliding surface of the sliding member are formed into an R surface shape.