Patents Examined by Abi Teka
  • Patent number: 11572674
    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.
    Type: Grant
    Filed: September 24, 2019
    Date of Patent: February 7, 2023
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Tetsuji Tanaka, Koji Hyodo, Yasunori Miyamoto, Isamu Aoki