Work machine
AssigneeKubota Corporation
InventorNaoya Okamoto
Life of this patent
Estimating the term…
Abstract
A work machine includes an engine, a hydraulic pump, a work apparatus driver to receive a pressurized fluid, a hydraulic circuit connecting the hydraulic pump with the work apparatus driver, a control valve in the hydraulic circuit, a relief valve connected to a first portion upstream of the control valve, a drain path connected to a second portion upstream of the first portion, an on-off valve to open and close the drain path, and a controller to control the on-off valve based on a state of the engine. The controller is configured or programmed to keep the on-off valve open after detecting an operation to start the engine until detecting a start of the engine and to close the on-off valve in response to detecting the start of the engine.
Claims6
A work machine, comprising:
- an engine;
- a hydraulic pump drivable by the engine;
- a work apparatus driver to receive pressurized fluid;
- a hydraulic circuit connecting the hydraulic pump with the work apparatus driver to supply the pressurized fluid from the hydraulic pump to the work apparatus driver;
- a control valve located in the hydraulic circuit to control the work apparatus driver;
- a relief valve connected to a first portion of the hydraulic circuit upstream of the control valve to set a pressure of the pressurized fluid to be supplied to the work apparatus driver;
- a drain path connected to a second portion of the hydraulic circuit upstream of the first portion to discharge the pressurized fluid from the hydraulic circuit not through the relief valve;
- an on-off valve to open and close the drain path;
- and
- a controller to control the on-off valve based on a state of the engine, the controller being configured or programmed to keep the on-off valve open after detecting an operation to start the engine until detecting a start of the engine and configured to close the on-off valve in response to detecting the start of the engine.
Dependencies are inferred from the claim text.