Invention Grant
- Patent Title: Loading vehicle
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Application No.: US17251069Application Date: 2019-03-13
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Publication No.: US11891781B2Publication Date: 2024-02-06
- Inventor: Koji Hyodo , Fumihiro Nakao , Yasunori Miyamoto , Masaki Nukii
- 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
- International Application: PCT/JP2019/010340 2019.03.13
- International Announcement: WO2020/183665A 2020.09.17
- Date entered country: 2020-12-10
- Main IPC: E02F9/22
- IPC: E02F9/22 ; E02F3/28 ; E02F9/02 ; F15B15/00

Abstract:
A loading vehicle is capable of improving work efficiency by adjusting engine rotational speed with high accuracy in accordance with an operation state of the working device. An HST traveling driven wheel loader has an electrically controlled HST pump. A controller is configured to control input torque of the HST pump 31 and solenoid proportional pressure reducing valve is configured to generate control pressure for controlling displacement volume of the pump based on a control signal from the controller. The controller is configured to calculate the displacement volume q of the HST pump based on discharge pressure Pf of a loading hydraulic pump so that maximum input torque Thst of the HST pump decreases as the discharge pressure Pf or input torque of the loading hydraulic pump increases, and output a control signal corresponding to the calculated displacement volume q to the solenoid proportional pressure reducing valve.
Public/Granted literature
- US20210123216A1 LOADING VEHICLE Public/Granted day:2021-04-29
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