Rotation control system for working-machine pump
AssigneeKomatsu Ltd.
InventorsYasuhiro Kamoshida, Kyouji Uranaka, Masaru Shizume
Life of this patent
Estimating the term…
Abstract
A rotation control system of a hoist pump includes: the hoist pump (3); an engine (2) for driving the hoist pump (3); a working equipment driven by a hydraulic cylinder that is extendable by hydraulic oil delivered through the hoist pump (3); a hydraulic oil tank that stores the hydraulic oil supplied to the hoist pump (3) and receives the hydraulic oil returned from the hydraulic cylinder; and a controller (9) that controls a rotation speed of the hoist pump (3) to be an allowable rotation speed that is set in advance for preventing cavitation while the hydraulic cylinder is operated.
Claims6
A rotation control system of a hoist pump, the system comprising:
- the hoist pump;
- an engine that drives the hoist pump;
- a working equipment driven by a hydraulic cylinder that is extended and retracted by hydraulic oil delivered through the hoist pump;
- a hydraulic oil tank that stores the hydraulic oil supplied to the hoist pump and receives the hydraulic oil returned from the hydraulic cylinder;
- a detector that detects an operation condition of the hydraulic cylinder;
- and
- a controller that controls a rotation speed of the hoist pump to be an allowable rotation speed, wherein when the operation condition detected by the detector indicates lowered pressure in the hydraulic oil tank, the controller controls the rotation speed of the hoist pump to be an allowable rotation speed for preventing cavitation that is lower than an allowable rotation speed of the hoist pump when the operation condition detected by the detector does not indicate lowered pressure in the hydraulic oil tank.
Dependencies are inferred from the claim text.