Invention Grant
- Patent Title: Working vehicle
-
Application No.: US16979975Application Date: 2019-09-24
-
Publication No.: US11572674B2Publication Date: 2023-02-07
- Inventor: Tetsuji Tanaka , Koji Hyodo , Yasunori Miyamoto , Isamu Aoki
- Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
- Current Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Mattingly & Malur, PC
- Priority: JPJP2018-184000 20180928
- International Application: PCT/JP2019/037348 WO 20190924
- International Announcement: WO2020/067053 WO 20200402
- Main IPC: E02F9/22
- IPC: E02F9/22 ; B62D5/07

Abstract:
Provided is a working vehicle capable of increasing lifting operation speed of a working device without increasing cost, even when provided with a circuit configuration that prioritizes a steering operation over a working device operation.
A wheel loader 1 comprises a priority valve 451 configured to allow hydraulic oil discharged from a hydraulic pump 41 to flow into a steering drive circuit 43 preferentially over a working device drive circuit 44, and further comprises: an electric steering lever 30; a pair of solenoid control valves 34A, 34B configured to control a steering directional control valve 33; and a controller 5. The controller 5 is configured to control the pair of solenoid control valves 34A, 34B so as to limit operation speed of a steering 3 when determining that an engine 40 is in a low idle state and a lift arm 21 is performing a lifting operation.
A wheel loader 1 comprises a priority valve 451 configured to allow hydraulic oil discharged from a hydraulic pump 41 to flow into a steering drive circuit 43 preferentially over a working device drive circuit 44, and further comprises: an electric steering lever 30; a pair of solenoid control valves 34A, 34B configured to control a steering directional control valve 33; and a controller 5. The controller 5 is configured to control the pair of solenoid control valves 34A, 34B so as to limit operation speed of a steering 3 when determining that an engine 40 is in a low idle state and a lift arm 21 is performing a lifting operation.
Public/Granted literature
- US20210047801A1 WORKING VEHICLE Public/Granted day:2021-02-18
Information query