Hydraulic system in work machine
AssigneeKubota Corporation
InventorYuji FUKUDA
Life of this patent
Estimating the term…
Abstract
A hydraulic system in of a work machine includes a hydraulic pump to supply pilot hydraulic oil in a hydraulic oil reservoir. A travel pump is to drive a travel motor according to a pilot pressure of the pilot hydraulic oil. A target pilot pressure of the pilot hydraulic oil is input through a travel operation device to control, according to the target pilot pressure, the pilot pressure supplied from the hydraulic pump to the travel pump. A pilot oil path connects the travel operation device and the travel pump to supply the pilot pressure to the travel pump. A drain oil path is divided from the pilot oil path. A pressure adjustment valve is provided in the drain oil path to adjust the pilot pressure to be less than the target pilot pressure when a condition is satisfied.
Claims37
A hydraulic system in a work machine, comprising:
- a hydraulic pump to supply pilot hydraulic oil in a hydraulic oil reservoir;
- a travel motor driven by hydraulic oil to rotate a shaft of the work machine;
- a travel pump to supply the hydraulic oil to the travel motor to drive the travel motor according to a pilot pressure of the pilot hydraulic oil;
- a travel operation device through which a target pilot pressure of the pilot hydraulic oil is input to control, according to the target pilot pressure, the pilot pressure supplied from the hydraulic pump to the travel pump;
- a pilot oil path connecting the travel operation device and the travel pump to supply the pilot pressure to the travel pump;
- a drain oil path divided from the pilot oil path;
- and
- a pressure adjustment valve provided in the drain oil path to adjust the pilot pressure to be less than the target pilot pressure when a condition is satisfied.
A hydraulic system in a work machine, comprising:
- a hydraulic pump to supply pilot hydraulic oil in a hydraulic oil reservoir;
- a work hydraulic actuator to move a work device of the work machine;
- a control valve to control the work hydraulic actuator based on a pilot pressure of the pilot hydraulic oil;
- a work operation device through which a target pilot pressure of the pilot hydraulic oil is input to control, according to the target pilot pressure, the pilot pressure supplied from the hydraulic pump to the control valve;
- a pilot oil path connecting the work operation device and the control valve to supply the pilot pressure to the control valve;
- a drain oil path divided from the pilot oil path;
- and
- a pressure adjustment valve provided in the drain oil path to adjust the pilot pressure to be less than the target pilot pressure when a condition is satisfied.
Dependencies are inferred from the claim text.