Toyota Jidosha Kabushiki Kaisha

Hitachi Automotive Systems, Ltd.

Ryousuke Kamae

Hideki Hata

Kazuyuki Mizuno

Sadatomo Matsumura

A shock absorber including a piston () slidably fitted in a cylinder having hydraulic oil sealed therein. A flow of hydraulic oil, induced in a passage () and a sub-passage () by sliding movement of the piston in the cylinder in response to the stroke of a piston rod, is controlled by an extension main valve () and a compression sub-valve () incorporated in the extension main valve, thereby generating a damping force. The amount of deflection of a sub-disk () constituting the compression sub-valve when the sub-disk is opened is limited by restricting portions (). The sub-disk is provided with communicating holes () to reduce a differential pressure acting on the sub-disk when opened and also to relax the concentration of stress in the sub-disk, thereby improving the durability of the sub-disk.

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Yokohama, Japan

Ryousuke Kamae