Komatsu Corporation

Teruyuki Hosoya

Mitsuo Yabe

Noboru Kanayama

Tomoya Watanabe

Kuniaki Nakada

Kazuya Imamura

A pressure-receiving face plateis mounted on one end face of a piston, and a support memberis raised on the end face of the piston. Disposed on the support memberwith an allowance are, from the pressure-receiving faceplaterespectively, a disk spring, a plate, and a plunger. A flangeprevents these members from slipping off the support member. When the pistonapproaches a stroke end, the plungeris inserted in an oil passageand applies a cushioning effect to the piston. In addition, a gap between the pressure-receiving faceplateand the platebrought into contact with a cylinder bottombecomes narrow, and produces a squeeze effect such that oil escapes from the narrow gap. This makes it possible to provide a hydraulic cylinder that produces a sufficient impact force at the stroke end of the piston and also reduces noise emitted by the impact force, without increasing a length of the hydraulic cylinder.

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Koriyama, Japan

Teruyuki Hosoya