JPH0522658Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a hydraulic shock absorber used in motorcycles and the like.

(Prior Art) A conventional hydraulic shock absorber, for example, as shown in FIG. 4, has an outer tube 5 filled with hydraulic oil.
A fork pipe 52 is slidably inserted between the outer tube 50 and the inner tube 51, and a free valve 53 is provided inside the inner peripheral surface of the lower end of the fork pipe 52. Oil lock collar 54 that holds
A rebound spring 55 is interposed above a rebound seat 54a formed at the top of the oil lock collar 54. Furthermore, an outer tube 50 is provided at the lower end of the outer tube 50.
A free piston 57 is slidably fitted into the inner peripheral surface of the reservoir tank 56 to form an air chamber 58 and an oil chamber 59 inside the reservoir tank 56. The oil chamber 59 is divided into an oil chamber 60 in the outer tube 50 and an oil hole 6 in the reservoir tank.
1. There is known a system that communicates with the reservoir tank 56 through an oil passage 62 and a valve 63.

This hydraulic shock absorber 65 operates in the oil chamber 6 in the outer tube 50 during the compression stroke of the fork pipe 52.
A part of the hydraulic oil (intrusion volume of the fork pipe) passes through the oil hole 61, the oil passage 62, and further flows into the oil chamber 59 via the valve 63, pushing up the free piston 57, while the fork pipe 5
2, during the extension stroke, the hydraulic oil in the oil chamber 59 in the reservoir tank 56 flows through the valve 63, oil passage 62,
The oil chamber 6 in the outer tube 50 via the oil hole 61
I am trying to return it to within 0.

(Problems to be Solved by the Invention) In order to attach the reservoir tank 56 to the main body of the hydraulic shock absorber 65, it is necessary to install it on the outside of the outer tube due to space constraints, and as shown in FIG. When formed integrally with the main body of the container 65, the outer tube 50
Forming the reservoir tank 56 is difficult because the distance between the center of the reservoir tank 56 and the center of the reservoir tank 56 must be made as short as possible. Further, in order to make the hydraulic shock absorber as compact as possible and to reduce the weight of the vehicle, it is necessary to eliminate the gap between the outer tube 50 and the reservoir tank 56 to save as much wasted space as possible.

(Means for solving the problem) A metal block is attached to the hydraulic shock absorber body separately from the hydraulic shock absorber body via a center bolt, and a part of the metal block is disposed inside the hydraulic shock absorber. A reservoir tank was formed that communicates the oil chamber in the cylinder.

(Function) By attaching the metal block in which the reservoir tank is formed separately from the hydraulic shock absorber main body, the hydraulic shock absorber main body and the reservoir tank can be formed easily and compactly.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a sectional view of essential parts of a hydraulic shock absorber according to the present invention, and FIG. 2 is a bottom view of the hydraulic shock absorber of FIG. 1.

A square ring 3 is fitted to the inner peripheral surface of the lower end of the bottom case 2 of the hydraulic shock absorber 1, and the flange portion 4a of the oil lock piece 4 is brought into contact with the upper surface of the square ring 3, and the inner peripheral surface of the oil lock piece 4 is brought into contact with the upper surface of the square ring 3. The lower portion of the cylinder 5 is fixed by a convex portion 4b formed at the lower end. Further, the upper edge of a metal block 6 that holds the lower part of the oil lock piece 4 in the recess is in contact with the lower surface of the square ring 3, and the metal block 6 is inserted into the center of the metal block 6 from the bottom through the packing 7. A bolt 8 is screwed onto the inner circumferential surface of a bottom piece 12 of a bottom valve mechanism 10 fitted to the lower inner circumferential surface of the cylinder 5, and is fixed to the bottom of the shock absorber 1 body.

In the bottom valve mechanism 10 described above, a valve guide 13 is fixed to the upper outer periphery of a bottom piece 12 in which an oil passage 11 is formed, and a plate valve 16 supported by valve seats 14 and 15 is mounted inside the valve guide 13. A needle valve 16 is provided and screwed into the center bolt 8 so as to be movable forward and backward, and faces the opening of the oil passage 11 of the bottom piece 12.

Also, the metal block 6 has a reservoir tank 2.
0 is integrally molded, the inside of the reservoir tank 20 is defined by a bladder 21 into an air chamber 22 and an oil chamber 23 filled with hydraulic oil, and the opening of the reservoir tank 20 is equipped with a valve 25 for sealing air. 26 is locked via a stop ring 27.

Further, an oil passage 28 communicating with the oil chamber 23 is provided in the metal block 6, and an opening 28 of this oil passage 28 is provided.
A corresponds to the oil hole 4c formed in the oil lock piece 4 and the oil hole 5a formed in the cylinder 5, and the oil passage 28 and the oil hole 4c of the oil lock piece 4,
Reservoir tank 2 via oil hole 5a of cylinder 5
The oil chamber 23 of the engine 0 and the oil chamber 30 inside the cylinder 5 are communicated with each other.

In addition, the skirt portion 2a formed at the lower part of the bottom case 2 covers the load outer circumference of the metal block 6.
In addition, the lower end of the skirt portion 2a is positioned below the metal block 6 to ensure that the metal block 6 does not come into direct contact with the road surface and receive an impact.

Other embodiments of the present invention include, for example, the third embodiment.
There are parts as shown in the figure, and the same members are given the same numbers as in FIG. 1, and their explanation will be omitted.

In this hydraulic shock absorber 35, the oil lock piece 37 has a bottom surface in contact with the top surface of the square ring 3, and is further fitted between the bottom case 2 and the cylinder 5 via a stopper ring 36 fitted on the inner peripheral surface. There is.

In addition, a metal block 6 with the bottom of the cylinder 5 inserted into the recess is brought into contact with the bottom of the square ring 3, and a bottom (not shown) is fitted with the bottom of the metal block 6 to the inner peripheral surface of the lower part of the cylinder 5 via the center bolt 8. It is screwed onto the inner peripheral surface of the bottom piece of the valve mechanism and fixed to the bottom of the shock absorber 1 body.

(Effects of the invention) As explained above, according to the invention, a metal block is attached to the hydraulic shock absorber body separately from the hydraulic shock absorber body via a center bolt, and a part of the metal block is equipped with a hydraulic shock absorber. Since the reservoir tank is formed to communicate with the oil chamber in the cylinder disposed in the container, a hydraulic shock absorber having a reservoir tank can be formed compactly and easily.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of the hydraulic shock absorber according to the present invention, Fig. 2 is a bottom view of the hydraulic shock absorber of Fig. 1, and Fig. 3 is a bottom view of the hydraulic shock absorber of Fig. 1.
The figure is a sectional view of a main part of a hydraulic shock absorber according to another embodiment of the present invention, and FIG. 4 is a sectional view of a waist part of a conventional hydraulic shock absorber. In addition, in the drawing, 1 is a hydraulic shock absorber, 5 is a cylinder, and 6 is a hydraulic shock absorber.
8 is a metal block, 8 is a center bolt, 30 is an oil chamber in the cylinder, and 20 is a reservoir tank.

Claims (1)

[Scope of utility model registration request] In a hydraulic shock absorber in which a metal block is provided at the bottom of the hydraulic shock absorber main body, the metal block consists of a part that fits into the inner circumference of the bottom case and a part that protrudes to the side of the bottom case. A recess with parallel axes is formed, the cylinder is coaxially supported via a center bolt in the recess formed in the part that fits into the inner circumference of the bottom case, and a recess is formed in the part that protrudes laterally of the bottom case. A hydraulic shock absorber characterized in that it is a reservoir tank that communicates with an oil chamber in a cylinder.