DAMPING FORCE ADJUSTABLE SHOCK ABSORBER

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DAMPING FORCE ADJUSTABLE SHOCK ABSORBER

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YAMASHITA MIKIO

This shock absorber is provided with a flow path (an oil path of a piston) in which a work fluid flows with movement of the piston rod, and a damping force adjustable valve which is disposed in the flow path and in which the opening/closing action is adjusted by a solenoid. In the flow path, in series with the damping force adjustable valve, a frequency sensitive mechanism is provided which reduces the damping force for high-frequency vibration. In the frequency sensitive mechanism, a second valve mechanism (a compression-side damping force generating valve and an expansion-side damping force generating valve) is provided which exerts resistance to the flow of the work fluid from an upstream-side chamber (an upper chamber or a lower chamber) to a downstream-side chamber (the lower chamber or the upper chamber).

本发明的阻尼力调节式缓冲器具备通过活塞杆的移动而产生工作流体的流动的流路(活塞的油通路)和设置于所述流路并且通过螺线管来对开闭动作进行调节的阻尼力调节阀。在所述流路中，设有与阻尼力调节阀串联，并且相对于高频振动降低阻尼力的频率感应机构。在频率感应机构中，具备对工作流体的从上游侧的室(上部室或下部室)向下游侧的室(下部室或上部室)的流动施加阻力的第二阀机构(缩短侧阻尼力发生阀和伸长侧阻尼力发生阀)。