Patents by Inventor Tsuyoshi Kitamira

Tsuyoshi Kitamira 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).

  • Hydraulic pump with a built-in electric motor
    Patent number: 6592336
    Abstract: A hydraulic pump with a built-in electric motor wherein an electric motor and a pump unit are arranged in tandem fashion and accommodated within a common housing. In this pump, the housing is in the form of a metal box having a rectangular parallelepiped external shape and forms an electric motor frame fixedly accommodating a stator of the electric motor therein. A space in the metal box on the electric motor side is separated as a dry space from an internal space of said pump unit by a seal mechanism. At least one hydraulic oil receiving chamber is formed in a peripheral wall of the metal box, and the hydraulic oil receiving chamber is communicated with a passage for receiving return oil externally and another passage communicating with a suction port of the pump unit.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: July 15, 2003
    Assignee: Yuken Kogyo Kabushiki Kaisha
    Inventors: Kenichi Hirano, Toshio Hashimoto, Tsuyoshi Kitamira