Patents by Inventor Yukitoshi Ogawa

Yukitoshi Ogawa 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).

  • Publication number: 20190136954
    Abstract: In a differential gear device including: a differential casing rotatable about an axis and having a pair of through-holes; a pinion shaft accommodated within the differential casing and extending through the through-holes; a pair of pinion gears fitted on an outer circumferential surface of the pinion shaft such that the pinion gears are rotatable relative to the pinion shaft; a pair of side gears meshing with the pinion gears; and a pair of pinion washers interposed between the differential casing and the respective pinion gears, each of the pinion washers has a retainer structure partially inserted through a gap formed between an inner circumferential surface of a corresponding one of the through-holes and the outer circumferential surface of the pinion shaft. The retainer structure is held in contact with a corresponding axial end face of the pinion shaft, to prevent axial movements of the pinion shaft.
    Type: Application
    Filed: November 1, 2018
    Publication date: May 9, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Yukitoshi OGAWA
  • Patent number: 8091873
    Abstract: A coned disc spring is arranged between a second component and a third component provided inside a tubular first component and movable in an axial direction. The coned disc spring comprises a body having a circular dish shape, teeth closely fitting into spline grooves formed on an inner peripheral surface of the first component and projecting to a radial outer side on an outer periphery of the body, and a stress relaxation portion formed by notching a base of the tooth in an approximately circular arc shape in a direction at least one of a circumferential direction and a radial direction of the body.
    Type: Grant
    Filed: February 10, 2006
    Date of Patent: January 10, 2012
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Aw Co., Ltd., NHK Spring Co., Ltd.
    Inventors: Yukitoshi Ogawa, Takayuki Ishikawa, Akihiko Kita, Shigeo Tsuzuki, Hiroyuki Nozaki, Hironobu Imaizumi
  • Patent number: 7438168
    Abstract: A cushion plate is provided, for example, between a piston of a hydraulic servo and an adjacent friction plate in a frictional engagement element of an automatic transmission. The cushion plate is deflected by a pressing force of the piston to absorb an engagement shock. The cushion plate includes a main body portion formed into a belleville-spring shape, and a plurality of pawls that extend from the outer periphery of the main body for spline engagement with a member that is splined to, for example, the friction plate. A side wall of each pawl is formed with a curved recess extending circumferentially of the cushion plate and located adjacent the juncture (base) of the pawl at the outer periphery of the main body.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: October 21, 2008
    Assignees: Aisin AW Co., Ltd., Toyota Jidosha Kabushiki Kaisha, NHK Spring Co., Ltd.
    Inventors: Akihiko Kita, Shigeo Tsuzuki, Hiroyuki Nozaki, Yukitoshi Ogawa, Takayuki Ishikawa, Hironobu Imaizumi
  • Publication number: 20080116029
    Abstract: A cushion plate is provided, for example, between a piston of a hydraulic servo and an adjacent friction plate in a frictional engagement element of an automatic transmission. The cushion plate is deflected by a pressing force of the piston to absorb an engagement shock. The cushion plate includes a main body portion formed into a belleville-spring shape, and a plurality of pawls that extend from the outer periphery of the main body for spline engagement with a member that is splined to, for example, the friction plate. A side wall of each pawl is formed with a curved recess extending circumferentially of the cushion plate and located adjacent the juncture (base) of the pawl at the outer periphery of the main body.
    Type: Application
    Filed: January 15, 2008
    Publication date: May 22, 2008
    Applicants: AISIN AW CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA, NHK SPRING CO., LTD.
    Inventors: Akihiko Kita, Shigeo Tsuzuki, Hiroyuki Nozaki, Yukitoshi Ogawa, Takayuki Ishikawa
  • Publication number: 20050263367
    Abstract: A cushion plate is provided, for example, between a piston of a hydraulic servo and an adjacent friction plate in a frictional engagement element of an automatic transmission. The cushion plate is deflected by a pressing force of the piston to absorb an engagement shock. The cushion plate includes a main body portion formed into a belleville-spring shape, and a plurality of pawls that extend from the outer periphery of the main body for spline engagement with a member that is splined to, for example, the friction plate. A side wall of each pawl is formed with a curved recess extending circumferentially of the cushion plate and located adjacent the juncture (base) of the pawl at the outer periphery of the main body.
    Type: Application
    Filed: May 25, 2005
    Publication date: December 1, 2005
    Applicants: AISIN AW CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akihiko Kita, Shigeo Tsuzuki, Hiroyuki Nozaki, Yukitoshi Ogawa, Takayuki Ishikawa
  • Patent number: 6319162
    Abstract: A sliding key slidable in an axial direction of a rotary shaft and engaging a sliding cylinder such that the sliding key follows a rotation of the sliding cylinder. The sliding key is a molded product of a metal-molded part and a resinous part. The sliding key does not malfunction or fail when it is used in an environment of a high temperature and a high load.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: November 20, 2001
    Assignees: NTN Corporation, Aichi Machine Ind. Co. LTD
    Inventors: Tamaki Mizutani, Masahiko Mizutani, Masashi Watanabe, Yukitoshi Ogawa
  • Patent number: 6183137
    Abstract: A bearing structure with a low coefficient of friction and a distinguished wear resistance is obtained by coating a shaft with a resin composition comprising PAI and 5 to 50% by weight of PTFE, based on total resin composition and/or coating a bearing with a resin composition comprising PEEK and not more than 50% by weight of PTFE, based on total resin composition. By adding potassium titanate whiskers or a lead compound to the bearing resin composition, more improved coefficient of friction and wear resistance are obtained.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: February 6, 2001
    Assignees: Daido Metal Company, Aichi Machine Industry So., Ltd.
    Inventors: Akira Kojima, Nobutaka Hiramatsu, Mitsuru Sugita, Akira Ono, Takayuki Shibayama, Yukitoshi Ogawa