Pump device and hydraulic actuator
AssigneeShowa Corporation
InventorsHayato Tsutsui, Takeshi Ueki, Shinya Horie, Kazuhiko Sadakata
Life of this patent
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Abstract
Provided is a pump device and a hydraulic actuator that can reduce the number of steps of performance measurement. The pump device includes: a switching valve for switching a flow of oil to a first chamber or a second chamber of a cylinder device, the inside of which is segmented into the first chamber and the second chamber by a piston; an up blow valve (first chamber-side relief valve) that relieves pressure of a first chamber-side flow path connected to the first chamber; and a down blow valve (second chamber-side relief valve) that relieves pressure of a second chamber-side flow path connected to the second chamber.
Claims8
A pump device comprising:
- a pump case;
- a switching valve for switching a flow of hydraulic fluid to one of a first chamber and a second chamber of a cylinder device, an inside of which is segmented into the first chamber and the second chamber by a piston;
- a first chamber-side relief valve that is capable of relieving pressure of a first chamber-side flow path connected to the first chamber;
- and
- a second chamber-side relief valve that is capable of relieving pressure of a second chamber-side flow path connected to the second chamber, wherein
- the switching valve, the first chamber-side relief valve, and the second chamber-side relief valve are integrally accommodated inside the pump case, and
- the first chamber-side relieve valve and the second chamber-side relief valve comprise a pressure adjustment mechanism that adjusts a working pressure.
A hydraulic actuator comprising:
- a cylinder device, an inside of which is segmented into a first chamber and a second chamber by a piston;
- and
- a pump device comprising:
- a pump case;
- a switching valve for switching a flow of hydraulic fluid to one of the first chamber and the second chamber;
- a first chamber-side relief valve that relieves pressure of a first chamber-side flow path connected to the first chamber;
- and
- a second chamber-side relief valve that relieves pressure of a second chamber-side flow path connected to the second chamber, wherein
- the switching valve, the first chamber-side relief valve, and the second chamber-side relief valve are integrally accommodated inside the pump case.
Dependencies are inferred from the claim text.