Patents by Inventor Sachio Kawabata

Sachio Kawabata 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).

  • Control device for variable displacement pump
    Patent number: 6244831
    Abstract: A control device for a variable displacement pump in which a discharge flow rate of a hydraulic operating fluid is varied by changing a variable element comprises a first negative feedback circuit 24 for controlling a pressure of the hydraulic operating fluid fed from the variable displacement pump, a second negative feedback circuit 24a, and change-over control means 88. The first negative feedback circuit 24 has first pressure detecting means 13 for detecting the pressure of the hydraulic operating fluid, second pressure detecting means 114 for detecting a vent pressure of an electromagnetic relief valve, and a differential pressure calculation circuit 122 for calculating a difference between the pressures detected by the first and second pressure detecting means 13 and 114.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: June 12, 2001
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Sachio Kawabata, Kazuhide Matsuda, Ryuji Sakai
  • Axial piston pump
    Patent number: 6186748
    Abstract: An axial piston pump has a structure in which an opening of one of the piston chambers starts overlapping with an opening portion when a pressure of another piston chamber reaches a pressure of a discharge port, and an opening of one of the piston chambers starts overlapping with an opening when a pressure of another piston chamber reaches a pressure of a suction port.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: February 13, 2001
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Tokihiko Umeda, Sachio Kawabata, Kazuhide Matsuda, Ryuji Sakai