| 摘要 |
PURPOSE: A damping force adjusting type hydraulic shock absorber is provided to directly control damping force, and reduce load to a solenoid through a wide adjustable range of damping force characteristic. CONSTITUTION: Oil flow generated by sliding of a piston(5) in a cylinder(2) is directly controlled by pressure control valves(30, 43) on an expanding side and a contracting side to change pressure in back pressure chambers(26, 36) and adjust injection-valve opening pressure of main disc valves(22, 34), and an adjustable range of damping force is widened. The expanding side and contracting side pressure control valves(30, 43) control injection-valve opening pressure based on balance of thrust at a slider(51) generated by difference in pressure receiving area of step parts(71, 72) of the slider(51) and of sub-disc valves(54, 55) in valve chests(52, 53) against thrust of a proportional solenoid(58), and load to the proportional solenoid(58) can be reduced by reducing the difference in pressure receiving area.
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