Patents by Inventor Ritsuo Toya
Ritsuo Toya 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: 10132368Abstract: A roller type one-way clutch includes an outer race in which at least one pocket having a cam surface on an inner periphery thereof is formed, an inner race which is spaced away from the outer race on an inside diameter side in a radial direction and which is relatively rotatably disposed concentrically with respect to the outer race, a roller which is disposed in the pocket and which engages with the cam surface to transmit a torque between the outer race and the inner race, a spring which is disposed between the outer race and the roller in the pocket and which urges the roller in a direction in which the roller engages with the cam surface, and a side plate secured to be in contact with one end surface in an axial direction of the outer race. The side plate has a non-circular shape, the one end surface in the axial direction is annular, and at least a portion of the one end surface in the axial direction of the outer race is exposed in a state in which the side plate is secured.Type: GrantFiled: June 18, 2014Date of Patent: November 20, 2018Assignee: NSK-WARNER K.K.Inventors: Takashi Kurita, Tetsuya Wakamori, Ritsuo Toya
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Publication number: 20160281800Abstract: A roller type one-way clutch includes an outer race in which at least one pocket having a cam surface on an inner periphery thereof is formed, an inner race which is spaced away from the outer race on an inside diameter side in a radial direction and which is relatively rotatably disposed concentrically with respect to the outer race, a roller which is disposed in the pocket and which engages with the cam surface to transmit a torque between the outer race and the inner race, a spring which is disposed between the outer race and the roller in the pocket and which urges the roller in a direction in which the roller engages with the cam surface, and a side plate secured to be in contact with one end surface in an axial direction of the outer race. The side plate has a non-circular shape, the one end surface in the axial direction is annular, and at least a portion of the one end surface in the axial direction of the outer race is exposed in a state in which the side plate is secured.Type: ApplicationFiled: June 18, 2014Publication date: September 29, 2016Inventors: Takashi Kurita, Tetsuya Wakamori, Ritsuo Toya
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Patent number: 8403122Abstract: In a wet-type multi-plate clutch comprising an externally-toothed plate and an internally-toothed plate each of which is formed by adhering a friction material on a core plate and in which torque is transmitted by engaging the externally-toothed plate and the internally-toothed plate, the friction materials are adhered on opposed surfaces of the externally-toothed plate and the internally-toothed plate which are opposed to each other.Type: GrantFiled: September 22, 2011Date of Patent: March 26, 2013Assignee: NSK-Warner K.K.Inventor: Ritsuo Toya
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Publication number: 20120012433Abstract: In a wet-type multi-plate clutch comprising an externally-toothed plate and an internally-toothed plate each of which is formed by adhering a friction material on a core plate and in which torque is transmitted by engaging the externally-toothed plate and the internally-toothed plate, the friction materials are adhered on opposed surfaces of the externally-toothed plate and the internally-toothed plate which are opposed to each other.Type: ApplicationFiled: September 22, 2011Publication date: January 19, 2012Inventor: RITSUO TOYA
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Patent number: 8037987Abstract: In a wet-type multi-plate clutch comprising an externally-toothed plate and an internally-toothed plate each of which is formed by adhering a friction material on a core plate and in which torque is transmitted by engaging the externally-toothed plate and the internally-toothed plate, the friction materials are adhered on opposed surfaces of the externally-toothed plate and the internally-toothed plate which are opposed to each other.Type: GrantFiled: September 13, 2010Date of Patent: October 18, 2011Assignee: NSK-Warner K.K.Inventor: Ritsuo Toya
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Publication number: 20100326786Abstract: In a wet-type multi-plate clutch comprising an externally-toothed plate and an internally-toothed plate each of which is formed by adhering a friction material on a core plate and in which torque is transmitted by engaging the externally-toothed plate and the internally-toothed plate, the friction materials are adhered on opposed surfaces of the externally-toothed plate and the internally-toothed plate which are opposed to each other.Type: ApplicationFiled: September 13, 2010Publication date: December 30, 2010Inventor: RITSUO TOYA
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Patent number: 7823712Abstract: In a wet-type multi-plate clutch comprising an externally-toothed plate and an internally-toothed plate each of which is formed by adhering a friction material on a core plate and in which torque is transmitted by engaging the externally-toothed plate and the internally-toothed plate, the friction materials are adhered on opposed surfaces of the externally-toothed plate and the internally-toothed plate which are opposed to each other.Type: GrantFiled: February 12, 2007Date of Patent: November 2, 2010Assignee: NSK-Warner K.K.Inventor: Ritsuo Toya
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Patent number: 7789209Abstract: The present invention provides a friction plate having a friction surface formed by adhering a friction material to a substantially annular core plate and wherein the friction surface is provided with an oil passage communicated with inner and outer peripheral edges of the friction plate, a first oil groove having an opening portion opened to the inner peripheral edge of the friction plate and an end portion terminating at a position between the inner and outer peripheral edges, and a second first oil groove having an opening portion opened to the outer peripheral edge of the friction plate and an end portion terminating at a position between the inner and outer peripheral edges.Type: GrantFiled: November 2, 2006Date of Patent: September 7, 2010Assignee: NSK Warner K.K.Inventors: Tomoyuki Miyazaki, Ritsuo Toya, Tsuyoshi Hirayanagi, Masahiro Kobayashi
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Patent number: 7779980Abstract: The present invention provides a wet multi-plate clutch comprising an external toothed plate formed by sticking a friction material to a core plate and an internal toothed plate formed by sticking a friction material to a core plate and designed so that torque is transmitted by engaging the external toothed plate with the internal toothed plate and wherein the friction materials are stuck to opposed surfaces where the external toothed plate is opposed to the internal toothed plate, and surfaces of the core plates to which the friction materials are stuck are provided with a plurality of surfaces offset axially.Type: GrantFiled: April 3, 2007Date of Patent: August 24, 2010Assignee: NSK-Warner K.K.Inventor: Ritsuo Toya
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Patent number: 7770708Abstract: The present invention provides a wet-type multi-plate clutch comprising an external toothed plate formed by sticking a friction material onto a core plate and an internal toothed plate formed by a friction material onto a core plate and designed so that torque is transmitted by engaging the external toothed plate with the internal toothed plate and wherein each of the external toothed plate and the internal toothed plate has one axial surface including a convex surface to which a friction material is stuck, and a friction surface from which a surface of the core plate is exposed and wherein the convex surface and the friction surface are opposed to each other.Type: GrantFiled: April 27, 2007Date of Patent: August 10, 2010Assignee: NSK-Warner K.K.Inventor: Ritsuo Toya
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Patent number: 7757827Abstract: A lockup clutch for a torque converter is provided with a friction lining. The friction lining is divided into a radially-outer-side friction lining and a radially-inner-side friction lining. ?-? characteristics of the radially-outer-side friction lining have a positive gradient to inhibit occurrence of a shudder by a stick-slip which takes place. The radially-inner-side friction lining is equipped with a large coefficient of static friction to provide large torque capacity during a clutch engagement. The radially-outer-side friction lining is bonded on a side of a piston in said lockup clutch.Type: GrantFiled: November 22, 2006Date of Patent: July 20, 2010Assignee: NSK-Warner K.K.Inventor: Ritsuo Toya
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Patent number: 7731005Abstract: The present invention provides a lock-up clutch mechanism for a torque converter, in which a plurality of friction materials are arranged concentrically in a radial direction and adjacent friction materials are integrally connected to each other.Type: GrantFiled: September 8, 2006Date of Patent: June 8, 2010Assignee: NSK-Warner K.K.Inventor: Ritsuo Toya
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Patent number: 7597180Abstract: A friction plate for a wet-type multiplate clutch is provided with a core plate and friction linings bonded on opposite sides of the core plate, respectively. Each of the friction linings is composed of plural segment pieces bonded at angular intervals on the corresponding one of said opposite sides. The segment pieces each have at least one first oil groove and at least one second oil groove. The first oil groove opens to a radially-inner side of its corresponding segment piece and has a closed end portion located in a radially-intermediate part of the corresponding segment piece, and the second oil groove opens to a radially-outer side of the corresponding segment piece and has a closed end portion located in another radially-intermediate part of the corresponding segment piece. The segment pieces are each provided in a friction surface thereof with at least one oil pocket closed at a circumference thereof.Type: GrantFiled: December 26, 2007Date of Patent: October 6, 2009Assignee: NSK-Warner K.K.Inventors: Masahiro Kobayashi, Tsuyoshi Hirayanagi, Ritsuo Toya, Masahiro Yamada, Hirokazu Hino
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Publication number: 20080236985Abstract: The present invention provides a wet type friction plate having a friction surface formed by securing a plurality of friction material segments to a substantially annular core plate, in which a groove extending through from an inner diameter side to an outer diameter side is formed between the friction material segments, and a recessed portion facing toward the core plate is formed in a side surface of the friction material segment defining the groove.Type: ApplicationFiled: March 28, 2008Publication date: October 2, 2008Inventor: Ritsuo TOYA
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Publication number: 20080185256Abstract: A friction plate for a wet-type multiplate clutch is provided with a core plate and friction linings bonded on opposite sides of the core plate, respectively. Each of the friction linings is composed of plural segment pieces bonded at angular intervals on the corresponding one of said opposite sides. The segment pieces each have at least one first oil groove and at least one second oil groove. The first oil groove opens to a radially-inner side of its corresponding segment piece and has a closed end portion located in a radially-intermediate part of the corresponding segment piece, and the second oil groove opens to a radially-outer side of the corresponding segment piece and has a closed end portion located in another radially-intermediate part of the corresponding segment piece. The segment pieces are each provided in a friction surface thereof with at least one oil pocket closed at a circumference thereof.Type: ApplicationFiled: December 26, 2007Publication date: August 7, 2008Applicant: NSK-Warner K.K.Inventors: Masahiro Kobayashi, Tsuyoshi Hirayanagi, Ritsuo Toya, Masahiro Yamada, Hirokazu Hino
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Patent number: 7322453Abstract: In a lockup clutch assembly for use in a torque converter, a friction lining attached to one of a clutch piston and a front cover of the torque converter is divided into an outer-circumference-side friction lining and an inner-circumference-side friction lining. The outer-circumference-side friction lining contains as a filler diatomaceous earth in a higher proportion than the inner-circumference-side friction lining.Type: GrantFiled: December 14, 2005Date of Patent: January 29, 2008Assignee: NSK- Warner K.K.Inventors: Yoshio Kinoshita, Shiro Takeuchi, Tatsuro Miyoshi, Shigeki Umezawa, Shun Kitahara, Tamotsu Fujii, Hiroyuki Kinpara, Kenji Maruo, Tomoyuki Miyazaki, Xiaoming Gu, Fumimasa Muramatsu, Shigeharu Nishimura, Ritsuo Toya
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Publication number: 20070295574Abstract: Friction materials 21 and 22 of different types which differ from each other in terms of a material and a thickness are affixed to respective surfaces of the friction plate 20 and engage with surfaces 31 and 32 of respective separators 30. In the case where the friction materials 21 and 22 are affixed to respective surfaces of the core plate 23 of the fiction plate 20, when the friction materials 21 and 22 are aligned in this sequence along a horizontal direction in a drawing, the surface 31 of the separator plate 30 engages with either of the friction materials 21 and 22, and the surface 32 of the same engages with a remaining friction material. However, when the friction materials 21 and 22 are affixed alternately in different sequence, either of the friction materials 21 and 22 engages with both sides of one separator plate 30.Type: ApplicationFiled: June 20, 2007Publication date: December 27, 2007Applicant: NSK-WARNER KABUSHIKI KAISHAInventors: Ritsuo Toya, Tsuyoshi Hirayanagi
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Publication number: 20070272508Abstract: The present invention provides a wet multi-plate clutch of mechanical coupling type in which friction engaging elements and mechanical coupling elements are operated by a single piston and wherein the friction engaging elements are operated by an urging force of the single piston smaller than a predetermined load, and the friction engaging elements and mechanical coupling elements are operated by an urging force of the single piston greater than the predetermined load.Type: ApplicationFiled: May 29, 2007Publication date: November 29, 2007Inventors: Ritsuo Toya, Manabu Sawayanagi, Shigeharu Nishimura
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Publication number: 20070251795Abstract: The present invention provides a wet-type multi-plate clutch comprising an external toothed plate formed by sticking a friction material onto a core plate and an internal toothed plate formed by a friction material onto a core plate and designed so that torque is transmitted by engaging the external toothed plate with the internal toothed plate and wherein each of the external toothed plate and the internal toothed plate has one axial surface including a convex surface to which a friction material is stuck, and a friction surface from which a surface of the core plate is exposed and wherein the convex surface and the friction surface are opposed to each other.Type: ApplicationFiled: April 27, 2007Publication date: November 1, 2007Inventor: Ritsuo Toya
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Publication number: 20070246321Abstract: The present invention provides a wet multi-plate clutch comprising an external toothed plate formed by sticking a friction material to a core plate and an internal toothed plate formed by sticking a friction material to a core plate and designed so that torque is transmitted by engaging the external toothed plate with the internal toothed plate and wherein the friction materials are stuck to opposed surfaces where the external toothed plate is opposed to the internal toothed plate, and surfaces of the core plates to which the friction materials are stuck are provided with a plurality of surfaces offset axially.Type: ApplicationFiled: April 3, 2007Publication date: October 25, 2007Inventor: Ritsuo Toya