JPS6243918Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a spring load adjustment device for a rear compression unit used in motorcycles and the like.

A rear suspension unit is generally a shock absorber that supports the rear wheel of a motorcycle in a shock absorbing manner, and slides inside a cylinder and pulls out a piston rod equipped with a damping force generating mechanism above the cylinder. A coil spring is interposed between a spring support fixed to the piston rod side and a spring support provided on the outer periphery of the cylinder, so that the impact generated in the vertical direction of the wheel is alleviated.

Therefore, the method for adjusting the vehicle height by adjusting the spring load of this rear suspension unit has a simple structure.
It has been used more widely than before. However, there are problems in that the work is not easy and requires a considerable amount of manpower and time, and adjustment cannot be performed steplessly.

This invention proposes a spring load adjustment device for a rear compression unit with the aim of solving the above problem.A sliding pipe is fitted and fixed on the outer periphery of the cylinder, and an annular member and a cylindrical member are attached to the outer periphery of the lower part of the sliding pipe. The members are sequentially fitted and fixed to the outside to form a tubular gap above the annular member, while the upper part forms a spring receiver shape to support the lower end of the coil spring, and the outer circumference of the sliding pipe is slidably fitted to the outside. A movable member formed to slidably fit the cylindrical member is disposed in the lower part, and a pressure chamber is formed by the movable member, the cylindrical member, the annular member, and the sliding pipe, and the pressure The gist is that the indoor chamber and the pressure chamber of the external sub-tank are communicated via a plug and flexible pipe.

Hereinafter, one embodiment of this invention will be described based on FIG. 1.

1 is the cylinder, 2 is the piston, 3 is the piston rod, 4 and 5 are the mounting brackets, 6 is the piston rod 3
It is a spring holder fixed on the side. A sliding pipe 24 is fitted around the outer periphery of the cylinder 1 and fixed with a pin 8. Further, an annular member 7 is fitted onto the outer periphery of the lower part of the sliding pipe 24, and its lower end is fixed with a circlip. A cylindrical member 9 is fitted onto the outer periphery of the annular member 7, and the cylindrical member 9 is fixed to the outer periphery of the annular member 7 by welding or the like at a position where a tubular gap is formed above the annular member 7. Reference numeral 10 denotes a movable member, the upper part of which is shaped like a spring receiver to support the lower end of the coil spring 11, and the outer periphery of the sliding pipe 24 is slidably fitted onto the outside, and the lower part of which supports the cylindrical member 9 in a slidable manner. It is formed and arranged so as to fit externally. A pressure chamber 12 is formed by the movable member 10, the cylindrical member 9, the annular member 7, and the sliding pipe 24.
is formed, and the pressure chamber 12 has an oil ring 13,
14 and 15 to maintain airtightness. Also,
The inside of the pressure chamber 12 is communicated with the inside of the pressure chamber 17 of the external sub-tank 16 via a plug-shaped portion 18 formed at a predetermined location of the movable member 10 and a flexible pipe 19. Note that 20 is a dust sealing boot, the lower end of which is clamped to the outer periphery of the cylinder 1. Further, 21 is a circlip that serves as a stopper.

In the spring load adjustment device for the rear suspension unit having the above structure, when raising the vehicle height, the piston sliding inside the sub-tank 16 is lowered by rotating the threaded rod of the piston by external operation. , the pressure chamber 12 via the flexible pipe 19 and the plug-shaped part 18.
Introduce pressure oil inside. However, the pressure chamber 12 expands, the movable member 10 moves upward and presses the lower end of the coil spring 11, causing the coil spring 11 to deflect, and a larger spring load than before is obtained, so the vehicle height becomes higher. Therefore, if a desired spring load is obtained, the introduction of pressure oil may be stopped. Although the spring load increases due to the introduction of pressure oil, the movable member 1
The maximum value is reached when the upper end surface of the movable member 10 contacts the circlip 21 for preventing the zero from coming off.

On the other hand, when lowering the vehicle height, the piston of the sub-tank 16 is raised, and the pressure oil in the pressure chamber 12 is discharged to the sub-tank 16 side. However, due to the restoring force of the coil spring 11, the movable member 10 is pressed downward and moves, and the spring load is reduced compared to the previous flexed state, so the vehicle height becomes lower. Note that the spring load is at its minimum when the inner surface of the movable member 10 comes into contact with the upper end surface of the cylindrical member 9.

The above has been explained based on the spring load adjusting device shown in FIG. 1, but the movable member 10 in the figure may be made into two members, a spring bearing 22 and a movable member 23, as shown in FIG. 2 which shows another embodiment of the invention.
In addition, the flexible pipe 19 is used as a branch pipe to connect the pressure chambers 1 of the rear cushion units on both the left and right sides.
By supplying and discharging pressurized oil into 2, the efficiency of spring load adjustment can be improved.

According to this invention, as mentioned above, the main body of the rear compression unit and the spring load adjustment mechanism are made in separate processes, so it is easy to disassemble and assemble.
Furthermore, a sliding pipe that is easy to polish is provided between the movable member and the cylinder, thereby eliminating the need for high-precision finishing work on the outer diameter of the cylinder. Furthermore, when adjusting the vehicle height, that is, adjusting the spring load, pressure oil or pressurized air can be supplied and discharged even when the vehicle is riding.
The work is easy, requires minimal manpower and time, and can be adjusted steplessly, making it extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing one embodiment of this invention, and FIG. 2 is a longitudinal sectional front view of main parts showing another embodiment of this invention. In the figure, 1... cylinder, 3... piston rod, 6, 22... spring receiver, 7... annular member, 9...
...Cylindrical member, 10, 23...Movable member, 11...
Coil spring, 12, 17...Pressure chamber, 16...Sub tank, 18...Plug shaped portion, 19...Flexible pipe, 20...Boot, 21...Circlip, 24...Sliding pipe.

Claims (1)

[Scope of utility model registration request] A piston rod that slides inside the cylinder and is equipped with a damping force generation mechanism is pulled out above the cylinder, and a spring receiver is fixed to the piston rod side.
In a rear action unit in which a coil spring is interposed between a spring support provided on the outer circumference of the cylinder, a sliding pipe is fitted and fixed on the outer circumference of the cylinder, and an annular member and a cylindrical member are sequentially attached to the outer circumference of the lower part of the sliding pipe. , are fitted and fixed on the outside to form a tubular gap above the annular member, while the upper part forms a spring holder shape to support the lower end of the coil spring, and the outer periphery of the sliding pipe is slidably fitted on the outside, and the lower part A movable member formed to slidably fit the cylindrical member is provided, and a pressure chamber is formed by the movable member, the cylindrical member, the annular member, and the sliding pipe, and the inside and outside of the pressure chamber are A spring load adjustment device for a rear action unit, characterized in that the pressure chamber of a sub-tank is communicated with the inside of the pressure chamber via a plug and a flexible pipe.