Patents by Inventor Toshiya Tatsumoto

Toshiya Tatsumoto 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).

  • Variable displacement pump
    Patent number: 6709242
    Abstract: In a variable displacement pump, a pressurizing cylinder is provided on an opposite side of the first fluid pressure chamber, holding the cam ring there between, and a piston inserted to the pressurizing cylinder collides with the cam ring. An oil chamber of the pressurizing cylinder is interposed in a pump discharge side passage, and wherein a pressure in an upstream side of the main throttle provided in the pump discharge side passage is introduced to the first fluid pressure chamber and the oil chamber of the pressurizing cylinder, and a pressure in a downstream side of the main throttle is introduced to the second fluid pressure chamber.
    Type: Grant
    Filed: March 11, 2002
    Date of Patent: March 23, 2004
    Assignee: Showa Corporation
    Inventors: Makoto Watanabe, Toshiya Tatsumoto, Hirotoshi Mochiyama
  • Variable displacement pump
    Patent number: 6616419
    Abstract: In a variable displacement pump, a pressurizing cylinder is provided in an opposite side of the first fluid pressure chamber, holding the cam ring there between, and a piston inserted to the pressurizing cylinder collides with the cam ring. A pressure in an upstream side of both throttle passages comprising the variable throttle passage and the fixed throttle passage provided in the pump discharge side passage is introduced to the first fluid pressure chamber and the oil chamber of the pressurizing cylinder, and a pressure in a downstream side of the both throttle passages is introduced to the second fluid pressure chamber.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: September 9, 2003
    Assignee: Showa Corporation
    Inventors: Makoto Watanabe, Toshiya Tatsumoto, Hirotoshi Mochiyama
  • Variable displacement pump
    Publication number: 20030007876
    Abstract: In a variable displacement pump, a pressurizing cylinder is provided on an opposite side of the first fluid pressure chamber, holding the cam ring there between, and a piston inserted to the pressurizing cylinder collides with the cam ring. An oil chamber of the pressurizing cylinder is interposed in a pump discharge side passage, and wherein a pressure in an upstream side of the main throttle provided in the pump discharge side passage is introduced to the first fluid pressure chamber and the oil chamber of the pressurizing cylinder, and a pressure in a downstream side of the main throttle is introduced to the second fluid pressure chamber.
    Type: Application
    Filed: March 11, 2002
    Publication date: January 9, 2003
    Inventors: Makoto Watanabe, Toshiya Tatsumoto, Hirotoshi Mochiyama
  • Variable displacement pump
    Publication number: 20030007875
    Abstract: In a variable displacement pump, a pressurizing cylinder is provided in an opposite side of the first fluid pressure chamber, holding the cam ring there between, and a piston inserted to the pressurizing cylinder collides with the cam ring. A pressure in an upstream side of both throttle passages comprising the variable throttle passage and the fixed throttle passage provided in the pump discharge side passage is introduced to the first fluid pressure chamber and the oil chamber of the pressurizing cylinder, and a pressure in a downstream side of the both throttle passages is introduced to the second fluid pressure chamber.
    Type: Application
    Filed: March 6, 2002
    Publication date: January 9, 2003
    Inventors: Makoto Watanabe, Toshiya Tatsumoto, Hirotoshi Mochiyama