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US 2022/0034068 A1Published application
Work machine
AssigneeKomatsu Ltd.
InventorsAkira NAKASHIMA, Isamu ODA
Life of this patent
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Abstract
A load sensing valve maintains a differential pressure at a set pressure by controlling a regulator in accordance with a differential pressure between a discharge pressure of a hydraulic pump and a load pressure of hydraulic actuators. A set pressure control device controls the set pressure. A controller controls the set pressure control device to reduce the set pressure more than when the work implement is being operated, when a predetermined determination condition that includes the work implement not being operated is satisfied.
Claims12
A work machine comprising:
- a variable displacement hydraulic pump;
- a plurality of hydraulic actuators including a work implement actuator and a hydraulic motor, the plurality of hydraulic actuators being driven by hydraulic fluid discharged from the hydraulic pump;
- a work implement connected to the work implement actuator;
- a fan connected to the hydraulic motor;
- a control valve configured to control a flow rate of the hydraulic fluid supplied from the hydraulic pump to the plurality of hydraulic actuators;
- a regulator configured to control a discharge displacement of the hydraulic pump;
- a load sensing valve configured to control the regulator in accordance with a differential pressure between a discharge pressure of the hydraulic pump and a load pressure of the plurality of hydraulic actuators to maintain the differential pressure at a set pressure;
- a set pressure control device configured to control the set pressure;
- and
- a controller configured to control the set pressure control device so that the set pressure is reduced more when a determination condition including the work implement not being operated is satisfied than when the work implement is being operated.
7 more elements
Dependencies are inferred from the claim text.