Hydraulic drive unit
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsKoki MIBU, Akihiro KONDO, Akihito SUZUKI
Life of this patent
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Abstract
A hydraulic drive unit includes: a pump; a pair of supply-discharge lines; a valve block; a sealed tank; a suction line that leads hydraulic oil in the sealed tank to the pump; a connecting line that connects an air vent port of the pump to the suction line; and a gas-liquid separator that separates air and the hydraulic oil flowing through the connecting line from each other. The pump is disposed upward of the valve block and the sealed tank in a vertical direction.
Claims3
A hydraulic drive unit for driving a hydraulic actuator including a pair of supply-discharge ports, the hydraulic drive unit comprising:
- a pump including a casing, a pair of pump ports, and an air vent port from which air in the casing is discharged to an outside of the casing together with hydraulic oil;
- a pair of supply-discharge lines that connects between the pair of pump ports and the pair of supply-discharge ports;
- a valve block that incorporates at least one valve therein, the at least one valve being provided on the pair of supply-discharge lines and/or oil passages connected to the pair of supply-discharge lines;
- a sealed tank that is connected to the pair of supply-discharge lines, the sealed tank storing the hydraulic oil;
- a suction line that leads the hydraulic oil in the sealed tank to the pump;
- a connecting line that connects the air vent port to the suction line;
- and
- a gas-liquid separator that separates air and the hydraulic oil flowing through the connecting line from each other, the gas-liquid separator supplying the separated hydraulic oil to the suction line while releasing the separated air from the connecting line, wherein
- the pump is disposed upward of the valve block and the sealed tank in a vertical direction.
Dependencies are inferred from the claim text.