Kayaba Industry Company, Ltd.

Husco International, Inc.

Hiroshi Kobata

Rollin C Christianson

Christopher John Kolbe

Cushion chambers () disposed in the vicinity of both ends of a hydraulic cylinder () to throttle inflow or outflow of an operating oil caused by a piston () moving close to a piston stroke end, pressure sensors () to detect pressures in the cushion chambers (), and a control valve () disposed in a passage to supply/drain the operating oil to and from oil chambers () of the hydraulic cylinder () for varying a flow amount of the operating oil are provided. A controller () varies an opening degree of the control valve () within a piston stroke end range based upon outputs of the pressure sensors (), adjusts a cushion pressure and controls a moving speed of the piston (). Thereby deceleration degrees of the piston () can be freely adjusted within the piston stroke end range based upon a change of the operating conditions of the hydraulic cylinder ().

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Sagamihara, Japan

Hiroshi Kobata