Patents by Inventor Yasushi OTAGAKI

Yasushi OTAGAKI has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Working machine
    Patent number: 11353048
    Abstract: A working machine includes a fan motor driven with hydraulic fluid, the fan motor including a first port and a second port, a bypass fluid passage connecting the first port of the fan motor and the second port to each other, a flow rate control valve provided on the bypass fluid passage to control a flow rate of the hydraulic fluid flowing in the bypass fluid passage, a drain passage configured to drain the hydraulic fluid upstream of the flow rate control valve, and an unloading valve shiftable between a full-closing position to close the drain passage and a full-opening position to open the drain passage.
    Type: Grant
    Filed: August 6, 2021
    Date of Patent: June 7, 2022
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Daiki Abe, Ryota Hamamoto, Kazuki Ueda, Kohei Kurachi, Yuya Konishi, Masaki Inaoka, Yasushi Otagaki, Yuya Tanabe
  • WORKING MACHINE
    Publication number: 20220049464
    Abstract: A working machine includes a fan motor driven with hydraulic fluid, the fan motor including a first port and a second port, a bypass fluid passage connecting the first port of the fan motor and the second port to each other, a flow rate control valve provided on the bypass fluid passage to control a flow rate of the hydraulic fluid flowing in the bypass fluid passage, a drain passage configured to drain the hydraulic fluid upstream of the flow rate control valve, and an unloading valve shiftable between a full-closing position to close the drain passage and a full-opening position to open the drain passage.
    Type: Application
    Filed: August 6, 2021
    Publication date: February 17, 2022
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji FUKUDA, Daiki ABE, Ryota HAMAMOTO, Kazuki UEDA, Kohei KURACHI, Yuya KONISHI, Masaki INAOKA, Yasushi OTAGAKI, Yuya TANABE
  • Flow rate control valve
    Patent number: 11174623
    Abstract: A flow rate control valve includes a first flow line to connect to a first fluid line connected to a hydraulic actuator, a second flow line to connect to a second fluid line connected to the hydraulic actuator, a third flow line to connect to a third fluid line connected to a hydraulic pump, a fourth flow line to connect to an operation fluid tank or a fourth fluid line connected to a suction portion of the hydraulic pump, a fifth flow line to connect a first control valve and a second control valve, and a spool including a first connecting portion being configured to connect the first flow line and the third flow line at a first position and to connect the first flow line and the fifth flow line at a second position.
    Type: Grant
    Filed: November 17, 2020
    Date of Patent: November 16, 2021
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Yoshimitsu Tanaka, Yasushi Otagaki
  • FLOW RATE CONTROL VALVE
    Publication number: 20210198869
    Abstract: A flow rate control valve includes a first flow line to connect to a first fluid line connected to a hydraulic actuator, a second flow line to connect to a second fluid line connected to the hydraulic actuator, a third flow line to connect to a third fluid line connected to a hydraulic pump, a fourth flow line to connect to an operation fluid tank or a fourth fluid line connected to a suction portion of the hydraulic pump, a fifth flow line to connect a first control valve and a second control valve, and a spool including a first connecting portion being configured to connect the first flow line and the third flow line at a first position and to connect the first flow line and the fifth flow line at a second position.
    Type: Application
    Filed: November 17, 2020
    Publication date: July 1, 2021
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji FUKUDA, Yoshimitsu TANAKA, Yasushi OTAGAKI