Kayaba Industry Company, Ltd.

Kayaba

Yoshitake Sakai

Osamu Sato

Shiro Nishioka

There is provided a fluid pressure drive unit that can fulfill a position holding function stably even when an external force acts during the time when the position is held, the unit being used, for example, for the right and left angle adjustment of a snow plow blade. There is provided a first excessive load relief valvefor letting a working fluid escape from a bottom-side pipe line, which connects the bottom-side port of a single-rod double acting cylinderto the bottom side of an operate check valve, to a rod-side pipe line, which connects the rod-side port of the single-rod double acting cylinderto the rod side of the operate check valve, and there is provided a second excessive load relief valvefor letting the working fluid escape from the rod-side pipe lineto a tank. Also, there is provided a negative pressure preventing check valvefor allowing the working fluid to flow into the bottom-side pipelinefrom the tank

Fluid pressure drive unit and snow removal unit

A filter-integrated orifice element is provided which can reduce manufacturing costs and assembling costs in a hydraulic circuit for which size reduction is desirable. A filter-integrated orifice element is obtained by integrating a filter for removing an obstacle which could block an orifice with an orifice member. The filter-integrated orifice element may be used in a slow return valve in a hydraulic circuit.

Orifice element with integrated filter, slow return valve, and hydraulic drive unit

A hydraulic controller in which driving sound and the number of parts can be reduced, and a long service life can be realized, and a hydraulic drive unit provided with said hydraulic controller. The hydraulic controller for a hydraulic drive unit includes a housing that includes an electric motor housing configured to house an electric motor, an oil pump housing configured to house a hydraulic pump, and a valve housing configured to house valves are integrated together.

Hydraulic controller and hydraulic drive unit provided with said hydraulic controller

An operate check valve saves space and performs multiple functions by absorbing and integrating a switching valve. A switching valve for controlling the flow of a hydraulic fluid in both normal and reverse directions is coaxially contained with a check valve in a space inside a valve containing housing between a hydraulic pump and a tank for storing the hydraulic fluid. Check valves are located opposite one another on either side of the switching valve, with the switching valve integrated into the operate check valve.

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Toki, Japan

Yoshitake Sakai