Kayaba Industry Company, Ltd.

Chikatoshi Abe

Tomoharu Murakami

Chikashi Imoto

Etsuro Nakada

Hiroyuki Emoto

A check seal () for discharging working oil scraped off a piston rod () by an oil lip () into an oil pool (A) of a hydraulic shock absorber to an oil reservoir (R) is disposed on the outside of the oil pool (A). The check seal () comprises an annular seat surface () and an annular lip () seated resiliently on the seat surface (). The annular seat surface () comprises an annular main rib () and an annular inner rib (), both of which project toward the annular lip (), such that an annular groove () is formed between the main rib () and the inner rib (). By providing a pressure introducing passage () to introduce a pressure inside the inner rib () to the annular groove (), the check seal () exhibits a high working oil discharging performance and a high working oil sealing performance.

Check seal structure for hydraulic shock absorber

There is provided a hydraulic damper including a receiving space formed between a rod guide of a cylinder and an insert metal, for temporarily retaining a working fluid leaked out from an oil chamber through a sliding gap of a rod. The hydraulic damper further includes a communicating path for communicating between a reservoir and the receiving space, and a check valve for allowing a flow of the working fluid only from the receiving space to the reservoir. Either one of a lip part of the check valve or a seat surface provided on the rod guide is formed with a sealing projected part protruding from a mutual contact surface.

Check valve structure of hydraulic damper

The vibrating device comprises, a vibrating tablevibrating upwards and downwards with respect to a vibrating platform, and a lower side installation sectionprovided on the vibrating tableand having a hemispherical recess surface for supporting the lower end section of a hydraulic shock absorber. It further comprises: a holding sectionfor pressing and holding the hydraulic shock absorbertowards the vibrating table; and an upper side installation sectionfor supporting the front end of the piston rodof the hydraulic shock absorber. Moreover, the vibrating device further comprises: a universal jointfor coupling the vibrating tableand the vibrating platform, and a restricting memberfor restricting the movement of the universal joint

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Tokyo, Japan

Chikatoshi Abe