JPH0244136U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the overall structure of a variable damping force type hydraulic shock absorber as an embodiment of the present invention, and Fig. 2 is a section showing a piston portion of the variable damping force type hydraulic shock absorber of Fig. 1. 3 is a partial sectional view showing another embodiment of the present invention; FIGS. 4 and 5 are schematic configuration diagrams illustrating the operation of the variable damping force type hydraulic shock absorber of FIG. 1; Figure 6a is a graph showing the relationship between the piston speed and the magnitude of damping force on the extension side and compression side in the variable damping force type hydraulic shock absorber of the present invention, and Figure 6 b is a graph showing the relationship between the piston speed and the magnitude of the damping force on the expansion side and compression side in the variable damping force type hydraulic shock absorber of the present invention. FIG. 7 is a sectional view showing the overall structure of a conventional variable damping force type hydraulic shock absorber. 21...Cylinder, 22...Piston, 23...
... Outer cylinder, 24 ... Piston rod, 29 ... Piston check valve, 34 ... Rebound damping force generation means, 37 ... Base check valve, 44 ... Compression side damping force generation means, 55 ... Damping force adjustment means, 6
0... Communication path, 61... Expansion and damping valve, 6
5... Extension and compression damping means, A... Upper liquid chamber, B...
...lower liquid chamber, D...reservoir chamber.

Claims (1)

[Scope of utility model registration request] A reservoir chamber formed between a cylindrical cylinder and an outer cylinder disposed outside the cylinder and filled with gas and liquid, and a reservoir chamber fixed to one end of a hollow piston rod and fitted into the cylinder. A piston that divides this cylinder into an upper liquid chamber and a lower liquid chamber, and a piston that is attached to this piston and causes liquid in the upper liquid chamber to flow out to the lower liquid chamber through an extension side damping force generating means during the extension stroke of the piston. A piston check valve that generates a damping force and opens during the piston's compression stroke to allow fluid to flow from the lower fluid chamber to the upper fluid chamber; A base check that causes the liquid in the lower liquid chamber to flow out to the reservoir chamber via a damping force generating means to generate a damping force, and opens during the extension stroke of the piston to allow liquid to flow from the reservoir chamber to the lower liquid chamber. a valve, a communication passage formed through the piston rod and through the base check valve and communicating between the upper liquid chamber and the reservoir chamber, and a communication passage interposed in the middle of the communication passage to change the passage cross-sectional area of the communication passage. a damping force adjusting means for adjusting the damping force generated during the extension stroke and the compression stroke of the piston; and a damping force adjusting means interposed between the damping force adjusting means and the reservoir chamber, which also serves as an extension force during the piston's extension stroke and compression stroke. 1. A variable damping force type hydraulic shock absorber comprising an expansion damping valve that causes liquid from an upper liquid chamber side to flow out into a reservoir chamber via a damping means to generate a damping force.