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).
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Patent number: 10704664Abstract: 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: GrantFiled: November 1, 2018Date of Patent: July 7, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yukitoshi Ogawa
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Publication number: 20190136954Abstract: 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: ApplicationFiled: November 1, 2018Publication date: May 9, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yukitoshi OGAWA
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Patent number: 8091873Abstract: 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: GrantFiled: February 10, 2006Date of Patent: January 10, 2012Assignees: 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
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Patent number: 7438168Abstract: 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: GrantFiled: January 15, 2008Date of Patent: October 21, 2008Assignees: 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
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Publication number: 20080116029Abstract: 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: ApplicationFiled: January 15, 2008Publication date: May 22, 2008Applicants: AISIN AW CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA, NHK SPRING CO., LTD.Inventors: Akihiko Kita, Shigeo Tsuzuki, Hiroyuki Nozaki, Yukitoshi Ogawa, Takayuki Ishikawa
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Publication number: 20050263367Abstract: 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: ApplicationFiled: May 25, 2005Publication date: December 1, 2005Applicants: AISIN AW CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akihiko Kita, Shigeo Tsuzuki, Hiroyuki Nozaki, Yukitoshi Ogawa, Takayuki Ishikawa
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Patent number: 6319162Abstract: 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: GrantFiled: June 5, 2000Date of Patent: November 20, 2001Assignees: NTN Corporation, Aichi Machine Ind. Co. LTDInventors: Tamaki Mizutani, Masahiko Mizutani, Masashi Watanabe, Yukitoshi Ogawa
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Patent number: 6183137Abstract: 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: GrantFiled: September 8, 1999Date of Patent: February 6, 2001Assignees: Daido Metal Company, Aichi Machine Industry So., Ltd.Inventors: Akira Kojima, Nobutaka Hiramatsu, Mitsuru Sugita, Akira Ono, Takayuki Shibayama, Yukitoshi Ogawa