JPS6056619A - Car height adjusting device for hydraulic buffer - Google Patents

Abstract

PURPOSE:To easily fit a moving member for adjusting car height to the external surface of a cylinder, reduce the number of components, improve assembly, and reduce cost by providing two step sections or more on the external surface of the cylinder. CONSTITUTION:Two step sections 35 and 25 are provided on the external surface of a cylinder 16 so that the head side can sequentially be diametrically extended and a moving member 26 with an internal surface that is equal to the maximum diameter circumference is externally engaged in the cylinder 16 from the intermediate large diameter section of the cylinder 16. The right of the moving member 26 is formed in a spring catch shape and formes a pressure room 28 between the member and the cylinder 16. The pressure room 28 is connected to a sub-tank through an oil path 29 perforated in the moving member 26. When car height is increased, pressure oil is introduced into the pressure room 28 and the moving member 26 is moved right and the counter-force of a coil spring is increased. When the car height is decreased, the pressure oil of the pressure room 28 is discharged to the sub-tank.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle height adjustment device for a hydraulic shock absorber used in motorcycles and the like.

Hydraulic shock absorbers that generally support the rear wheels of motorcycles are
The rond of the piston, which slides inside the cylinder and is equipped with a damping force generation mechanism, is pulled out to the outside of the cylinder, and the coil is placed between the spring holder fixed on the piston rond side and the spring holder provided on the outer periphery of the cylinder. It is constructed with a spring interposed, the upper part of which is attached to the storage frame, and the lower end supports the axle to alleviate the WI shock that occurs in the vertical direction of the wheel. It is well known that this type of shock absorber adjusts the spring load to adjust the vehicle height, and for example, there has been a shock absorber as shown in FIG. 1 in the past.

In the figure, (1) is a cylinder, (2) is a piston, and (3) i
, l: piston rod, (4) is a spring holder, (5) is a spring guide, (6) k2' is a coil spring, (7) is a sleeve fitted and fixed on the outer periphery of the sill, and (8) is the sleeve. (
The coil spring (6) is a cylindrical member that is externally fitted and fixed to the coil spring (6).
) is configured such that the left enlarged diameter part of the movable member (9) in the shape of a spring receiver that supports the left end of the sleeve is slidably fitted onto the right diameter reduced part of the cylindrical member (8). (7)
The pressure chamber Q is formed by the cylindrical part +4 (8) and the movable member (9).
It has already formed a l. (10 is a sub-tank provided outside, and the pressure chamber (lz and flexible pipe fl:l) of the sub-tank αυ, the plug I, and the cylindrical member (
8) is connected to the pressure chamber Ql through the oil passage (+! Eject and remove the movable member (9
), thereby compressing or expanding the coil spring (6) to adjust the vehicle height. Therefore, the vehicle height adjustment device has a large number of parts, making it expensive and difficult to assemble, and it is also difficult to meet the demand for weight reduction.

This invention is a vehicle height adjustment device for a hydraulic shock absorber proposed in view of the above points, in which step portions are provided at two or more places on the outer periphery of the cylinder so that the diameter of the head side is sequentially expanded, and the intermediate large diameter of the cylinder is It has an inner circumferential surface that matches the outer circumference of the maximum diameter part,
In addition, a movable member in the shape of a spring receiver that supports one end of a coil spring is fitted onto the cylinder, and fluid is introduced or discharged from an external sub-tank into a pressure chamber formed between the movable member and the cylinder. Accordingly, the movable member is movable up and down along the outer periphery of the cylinder, and an oil seal is provided on the inner circumferential surface of the movable member that comes into sliding contact with the outer periphery of the cylinder.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

In the diagram Q! is a cylinder, αη is a piston sliding inside the cylinder θφ, and side is a rod of the piston θη, which is pulled out from the cylinder wall. A mounting bracket (11) is fixed to the outer end of the piston rod OQ, and a mounting bracket (to) is fixed to the end of the cylinder ae head side. The mounting bracket (2r) can be attached to the lower axle.It can also be attached to an inverted type Monoke in reverse.

A collar member +211 and a rebound rubber (23) are externally fitted and fixed on the inside of the mounting bracket α9 of the piston rod.
The base end of the spring guide (2) that is in sliding contact with the outer periphery and the spring receiver (
01) is supported by the flange member 01). On the other hand, two stepped portions C (9+n) are provided on the outer periphery of the cylinder αe so that the diameter of the head side is gradually expanded.
A movable member (c) having an inner peripheral surface corresponding to the outer circumference of the intermediate large diameter part to the maximum diameter part of e is fitted onto the cylinder 06). The right side of the movable member Qe has a spring receiver shape, and a coil spring (5) is interposed between the movable member Qe and the spring receiver (2). Further, a groove is bored in the curved surface of the inner circumference of the movable member (a), and a pressure chamber (to) is formed between the movable member (a) and the cylinder a0. The pressure chamber (2) has four oil pipes perforated in the movable member (4);
A plug-shaped portion (
7) and a pressure chamber of an external sub-tank (not shown) via a flexible pipe (311).

Note that 0 is a dust cover whose base end is fixed to the head side outer periphery of cylinder θQ, and whose distal end skirt surrounds the outer periphery of the movable member (4). It is something that can be installed. (G) (Foundation) is an oil seal provided on the inner peripheral surface of the movable member (A) that slides on the outer periphery of the cylinder (+B), and completely seals the pressure chamber (C). (To) is a dust seal, R371 is a stopper ring provided on the outer periphery of the intermediate large diameter portion of the cylinder (IG).

A vehicle height adjustment device for a hydraulic shock absorber having the above configuration,
When raising the vehicle height, the piston sliding inside the sub-tank is inserted by rotating the threaded rod of the piston using an external drying operation, and the flexible pipe f'
Pressure oil is introduced into the pressure chamber (to) through the plug-shaped portion (g) and the oil passage (a).

The pressure chamber expands, and the movable member (a) moves to the right in the figure and presses the left end of the coil spring (b), causing it to become thicker than before. Because of the spring load, the risk of serious illness increases due to the spring reaction force. Therefore, any spring load is 7 Sona et al'11. 11-. When introducing pressure oil. do it. Note that the spring load will increase due to the introduction of pressure oil, but when removing the old 261 from the fih part, there is a stop ring c to prevent it from coming off.
The maximum value is reached when the right end surface of the flexible rib member Qθ abuts at t71.

On the other hand, when lowering the vehicle height, the piston in the sub-tank is moved back, and the pressure oil in the pressure chamber is discharged into the sub-tank. However, due to the restoring force of the coil spring ((5), the movable member - moves to the left in the figure -I+'!) and therefore returns to its previous bent state V.
Since the spring load is reduced by S, the vehicle height becomes lower.

Note that the stepped portion (C) of the cylinder (If,) is
- role tq'l + None, the step part (j has a movable member (a)
When the inner peripheral surface is engaged, the amount of spring load is reduced. Also, the pressure '$ (the fluid introduced into the hole is not limited to pressure oil).

According to this invention, as described above, the conventional small height if! The number of parts is very small compared to the J adjustment device, which makes it cheaper and easier to assemble! The weight of the 7111 desert impact z descent will be reduced. However, since there are two or more stepped portions on the outer periphery of the cylinder, the movable member can easily fit onto the outer periphery of the cylinder, making assembly easy. The fitting is also very easy because the movable member can be fitted to the outer periphery of the cylinder, the oil seal can be fitted to the outer periphery of the cylinder, and then the oil seal can be fitted into the predetermined groove. It becomes easier. Moreover, the hydraulic shock absorber equipped with this vehicle height adjustment device can be used in both an upright type and an inverted type, and has great effects.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional front view of the lower half of a conventional hydraulic shock absorber height adjustment device, Fig. 2 is a longitudinal sectional front view of an embodiment of the present invention, and Fig. 3 shows the movable members in Fig. 2. FIG. 16...Cylinder, 17...Piston, 18...
Piston rod, A...Spring holder, 6, A...Step,
B...Movable member, γ...Coil spring, A...Pressure chamber, 4...Oil passage, blade...Plug shaped part, 31...
Flexible No. 4 Izo, ah, ah... oil seal.

Claims (1)

[Claims] 1. The rond of a piston that slides inside the cylinder and is equipped with a damping force generation mechanism is pulled out to the outside of the cylinder, and the spring bearing fixed to the piston rond side and the rond of the piston provided on the outer periphery of the cylinder are In a hydraulic shock absorber in which a coil spring is interposed between the cylinder and the spring support, two or more steps are provided on the outer periphery of the cylinder so that the diameter of the head side gradually increases. A movable member having an inner circumferential surface corresponding to the outer circumference of the cylinder and having a spring-receiving shape that supports one end of the C/F spring is fitted onto the cylinder, and pressure is generated between the movable member and the cylinder. A vehicle height adjustment device for a hydraulic shock absorber, characterized in that the movable member can be raised and lowered along the outer periphery of a cylinder by introducing or discharging fluid from an external sub-tank into the room. 2. The head (lilldi 1111) is provided with two or more stepped portions on the outer periphery of the cylinder so that the diameter is enlarged, and has an inner peripheral surface corresponding to the outer periphery of the cylinder from the intermediate large diameter part to the maximum diameter part, and has a coil spring. A movable member in the shape of a spring receiver that supports one end is fitted onto the cylinder, and fluid is introduced into or discharged from an external sub-tank into the pressure chamber formed between the movable member and the cylinder. A vehicle height adjustment device for a hydraulic shock absorber, characterized in that the member is movable up and down along the outer periphery of a cylinder, and an oil seal is provided on the inner peripheral surface of the movable member that slides on the outer periphery of the cylinder.