Patents by Inventor Takehiko Katsuragi

Takehiko Katsuragi 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).

  • HST cooling circuit
    Patent number: 8468818
    Abstract: There are provided: an HST hydraulic circuit that is formed through a closed circuit connection of a variable displacement hydraulic pump 2 and first and second variable displacement hydraulic motors 3 and 4; a charge pump 6 that replenishes the HST hydraulic circuit with hydraulic oil; a cooling circuit through which an excess of the hydraulic oil that has been replenished from the charge pump 6 to the HST hydraulic circuit is returned to a reservoir through the hydraulic pump 2, the first hydraulic motor 3, and the second hydraulic motor 4; a hydraulic source 7 that supplies hydraulic oil to an hydraulic device other than the first and second hydraulic motors; and a merge circuit through which a portion of hydraulic oil from the hydraulic source 7 is merged into an intermediate oil line 22 that lies downstream of the first hydraulic motor 3 and upstream of the second hydraulic motor 4 in the cooling circuit.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: June 25, 2013
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Koji Hyodo, Kazuo Ishida, Tsuyoshi Takeyama, Tadayoshi Aoki, Takehiko Katsuragi, Shoroku Kawahara
  • HST Cooling Circuit
    Publication number: 20100095664
    Abstract: There are provided: an HST hydraulic circuit that is formed through a closed circuit connection of a variable displacement hydraulic pump 2 and first and second variable displacement hydraulic motors 3 and 4; a charge pump 6 that replenishes the HST hydraulic circuit with hydraulic oil; a cooling circuit through which an excess of the hydraulic oil that has been replenished from the charge pump 6 to the HST hydraulic circuit is returned to a reservoir through the hydraulic pump 2, the first hydraulic motor 3, and the second hydraulic motor 4; a hydraulic source 7 that supplies hydraulic oil to an hydraulic device other than the first and second hydraulic motors; and a merge circuit through which a portion of hydraulic oil from the hydraulic source 7 is merged into an intermediate oil line 22 that lies downstream of the first hydraulic motor 3 and upstream of the second hydraulic motor 4 in the cooling circuit.
    Type: Application
    Filed: March 12, 2008
    Publication date: April 22, 2010
    Applicants: TCM Corporation, Hitachi Construction Machinery CO., Ltd
    Inventors: Koji Hyodo, Kazuo Ishida, Tsuyoshi Takeyama, Tadayoshi Aoki, Takehiko Katsuragi, Shoroku Kawahara