JPH0226787Y2 - - 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 a shock absorber that generally supports the rear wheel of a motorcycle using a shock absorbing method.It slides inside a cylinder and pulls out a piston rod equipped with a damping force generating mechanism to the outside of 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 reduced.

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-mentioned problem.The device is equipped with a damping force generating device and the rod of the piston sliding inside the cylinder is pulled out to the outside of the cylinder. , in a hydraulic shock absorber in which a sliding pipe latched to the pulled-out piston rod side metal fitting is extended to the outer periphery of the cylinder, and a coil spring is compressed on the outer periphery of the cylinder, the sliding pipe 5 is fitted on the outer periphery of the sliding pipe 5. A cylindrical member 7 forms a gap between the cylindrical member 7 and the sliding pipe, and a movable member that is slidably fitted onto the outside so as to keep the gap airtight and form a pressure chamber, and to which one end of the coil spring 15 is engaged. 8, a sub tank 17 attached to the cylindrical member and supplying pressure oil to the pressure chamber, and a spring receiver 14 fixed to the outer periphery of the cylinder 1 to which the other end of the coil spring is locked. .

Hereinafter, one embodiment of this invention will be described based on the accompanying drawings.

1 is a cylinder, 2 is a piston rod, and 3 and 4 are mounting fittings. Reference numeral 5 denotes a sliding pipe, which is fitted and locked from the outer periphery of the cylinder 1 to the rod side metal fitting 6. A cylindrical member 7 is provided to form a tubular gap on the outer peripheral side of the pipe 5, and to open the cylinder side of the gap and close the other side. A movable member 8 is provided on the open end side of the cylindrical member 7 and has a flange portion that slides along the outer periphery of the cylindrical member 7. The movable member 8 has the sliding pipe 5 slidably fitted thereon. The pressure chamber 9 formed by the sliding pipe 5, the cylindrical member 7, and the movable member 8 is held airtight by oil rings 10, 11, and the sliding surface between the movable member 8 and the cylindrical member 7 is Dust seal 12
protected by. Further, a coil spring 15 is interposed between a spring receiver 13 that contacts the movable member 8 and is slidably fitted onto the sliding pipe 5, and a spring receiver 14 that is externally fitted and fixed on the cylinder head side. There is.

A plug 16 is welded to a predetermined location on the outer circumference of the cylindrical member 7, and the oil inlet/outlet side joint of the external sub-tank 17 is inserted and screwed into the plug 16 to form a hole between the oil chamber in the tank 17 and the outer wall of the cylindrical member 7. It communicates with the inside of the pressure chamber 9 through a provided oil hole. In addition,
The piston 18 fitted into the sub-tank 17 is
The upper end is fixed to a handle 19 above the sub-tank 17, and is rotatably screwed into a rod 20 inserted in the axial direction at the center of the tank. On the other hand, sub tank 1
A lid 21 that closes the upper end of the tank 17 is fitted and fixed to the outer wall of the tank 17, and the lower part of the pin 22, whose upper part is inserted and secured into the lid 21, is loosely inserted into the piston 18. Therefore, when the handle 19 is rotated, the rod 20 integrated with the handle 19 rotates, and the rotation is transmitted to the piston 18 which is screwed with the rod 20. Then, the piston 18 moves up and down to adjust the oil pressure in the sub-tank 17. Note that 23 is a stepped portion for preventing the rod 20 from coming off.

In the spring load adjusting device for the rear compression unit having the above structure, when raising the vehicle height, the piston 18 in the sub-tank 17 is lowered by rotating the handle 19, and pressure oil is introduced into the pressure chamber 9. However, the pressure chamber 9 expands, and the movable member 8 moves to the right in the figure, causing the spring receiver 13 to move to the right in the figure.
The coil spring 15 is pressed and bent through the coil spring 15, and a larger spring load than before can be obtained, so the vehicle height becomes higher. Therefore, if a desired spring load is obtained, the introduction of pressure oil can be stopped. On the other hand, when lowering the vehicle height, the piston 18 of the sub-tank 17 is raised, and the pressure oil in the pressure chamber 9 is discharged into the sub-tank 17. However, due to the restoring force of the coil spring 15, the movable member 8 is pressed and moved to the left, and the spring load is therefore reduced compared to the previous deflected state, so the vehicle height becomes lower.

According to this invention, as described above, the main body of the rear compression unit and the spring load adjustment mechanism are made in separate processes, and the spring load adjustment mechanism is a cassette type structure that is attached to the rear compression unit body. Therefore, the work is easy whether the spring load adjustment mechanism is installed on the piston rod side as in the embodiment or on the cylinder head side, and it can be applied to both upright and inverted rear action units. It has excellent disassembly/assembly and compatibility. In addition, the work of adjusting the vehicle height is easy, requiring minimal human effort and time, and can be adjusted steplessly.Furthermore, because a sliding pipe is provided,
In addition to preventing dirt from getting caught in the piston rod and protecting the bound rubber, the sub-tank is attached directly to the pressure chamber, eliminating the need for a hydraulic hose and eliminating the risk of oil leakage due to hose damage.
Very useful.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal front view showing one embodiment of this invention. 1...Cylinder, 2...Piston rod, 5...
...Sliding pipe, 6... Rod side fitting, 7... Cylindrical member, 8... Movable member, 9... Pressure chamber, 13,
14... Spring holder, 15... Coil spring, 16...
Plug, 17...Subtank, 18...Piston, 19...Handle, 20...Rod, 21...Lid, 22...Pin.

Claims (1)

[Scope of utility model registration request] A piston rod equipped with a damping force generator and sliding inside the cylinder is pulled out of the cylinder,
In a hydraulic shock absorber in which a sliding pipe locked to the pulled-out piston rod side metal fitting is extended to the outer periphery of the cylinder and a coil spring is contracted around the outer periphery of the cylinder, the sliding pipe 5 is fitted onto the outer periphery of the sliding pipe 5 and Cylindrical member 7 that forms a gap between it and the sliding pipe
, a movable member 8 which is slidably fitted onto the outside so as to airtightly maintain the inside of the gap and form a pressure chamber, and to which one end of a coil spring 15 is engaged, and a movable member 8 which is attached to the cylindrical member and which supplies pressure oil to the pressure chamber. Subtank 17 that supplies
and a cylinder 1 to which the other end of the coil spring is engaged.
1. A hydraulic spring load adjustment device for a hydraulic shock absorber, comprising a spring receiver 14 fixed to the outer periphery of the hydraulic shock absorber.