Patents by Inventor Ryuji Nakata

Ryuji Nakata 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: 20190218474
    Abstract: A grease composition includes a base oil, a thickener, and an additive. The base oil contains a synthetic oil. The thickener contains a compound having a urea group. The additive contains a phosphoric compound, a calcium-based compound, and a hydrocarbon-based wax. A hub unit includes the grease composition enclosed therein.
    Type: Application
    Filed: September 28, 2016
    Publication date: July 18, 2019
    Applicants: JTEKT CORPORATION, KYODO YUSHI CO., LTD.
    Inventors: Koji YOSHIZAKI, Hiroshi INUKAI, Yoichiro SANKAI, Shinji YAMANE, Hideo SHIBATA, Hirofumi INOUE, Ryuji NAKATA, Junichi IMAI, Yutaka IMAI, Ryosuke SAITO, Yuta SATO
  • Publication number: 20180298304
    Abstract: Provided is a grease composition containing a base oil, a thickener, and an additive. The base oil contains a poly-?-olefin and has a kinematic viscosity of 20-60 mm2/s at 40° C. The thickener contains a urea compound produced by reacting a diisocyanate compound with a mixed amine containing an alicyclic amine and an aromatic amine. The additive contains a phosphorous acid ester, an ether compound, and an oxidized paraffin.
    Type: Application
    Filed: June 9, 2016
    Publication date: October 18, 2018
    Applicants: JTEKT Corporation, JXTG Nippon Oil & Energy Corporation
    Inventors: Koji YOSHIZAKI, Hiroshi INUKAI, Yoichiro SANKAI, Shinji YAMANE, Hideo SHIBATA, Hirofumi INOUE, Ryuji NAKATA, Kazumi SAKAI, Kentaro YAMAGUCHI, Kiyomi SAKAMOTO
  • Patent number: 9061698
    Abstract: A speed reducer for an electric power steering system includes a worm, a worm wheel, and a housing. Only a meshing section where the worm and the worm wheel mesh with each other and a space between the worm wheel and the housing are filled with grease. The grease in the space is in contact with both tooth surfaces of the worm wheel and an inner peripheral face of the housing, the inner peripheral face facing the worm wheel.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: June 23, 2015
    Assignee: JTEKT CORPORATION
    Inventors: Yuji Wakugawa, Ryuji Nakata, Atsuhiro Yoshida, Wataru Yamada, Jun Hamakita, Hideyuki Honkado
  • Publication number: 20140102235
    Abstract: A speed reducer for an electric power steering system includes a worm, a worm wheel, and a housing. Only a meshing section where the worm and the worm wheel mesh with each other and a space between the worm wheel and the housing are filled with grease. The grease in the space is in contact with both tooth surfaces of the worm wheel and an inner peripheral face of the housing, the inner peripheral face facing the worm wheel.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 17, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Yuji WAKUGAWA, Ryuji NAKATA, Atsuhiro YOSHIDA, Wataru YAMADA, Jun HAMAKITA, Hideyuki HONKADO
  • Patent number: 8513171
    Abstract: A lubricant composition, which is low in friction, does not have an attacking property against polyamide resin, etc., is excellent in heat resistance, and especially does not undergo deterioration or loss of the respective characteristics in a short term when used under a high temperature environment, is provided along with a speed reduction gear and an electric power steering apparatus that use the lubricant composition. The lubricant composition has blended therein a synthetic hydrocarbon oil, a urea thickener, zinc stearate, and a sulfur-based antioxidant. A speed reduction gear has a portion of engagement of a small gear and a large gear filled with the lubricant composition. In an electric power steering apparatus, an output of a steering assisting electric motor is speed reduced and transmitted to a steering mechanism via the speed reduction gear.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: August 20, 2013
    Assignees: JTEKT Corporation, Kyodo Yushi Co., Ltd.
    Inventors: Ryuji Nakata, Miwa Hokii, Mitsuhiro Kakizaki, Daisuke Tsutsui
  • Patent number: 8308431
    Abstract: A turbocharger includes a turbine wheel having a center hole and a turbine shaft having one end secured on a small-diameter inner circumferential surface of the center hole. A large-diameter inner circumferential surface and a large diameter outer circumferential surface are formed to provide a cylindrical clearance opening toward a bearing housing between the center hole and the outer circumferential surface of the turbine shaft.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: November 13, 2012
    Assignee: Jtekt Corporation
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akio Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takehisa Kida
  • Patent number: 8105053
    Abstract: A turbocharger includes a housing, and a turbine shaft supported in a center hole in the housing through rolling bearings. A tank portion for storing lubrication oil is formed in the housing, and the lubricating oil is supplied from the tank portion to the rolling bearings through wick members extending from the tank portion respectively to the rolling bearings. The wick member includes a bundle of fibers made of a plastics material, and a distal end portion thereof is separated into a fibrous condition, and this distal end portion is held in contact with the bearing. The lubricating oil is supplied to the bearing by a capillary action of the wick member.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: January 31, 2012
    Assignee: JTEKT Corporation
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akio Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takehisa Kida
  • Patent number: 8063002
    Abstract: A solid lubricating composition having resin material is disposed between an outer ring and an inner ring of a ball bearing. As the resin material contained in the solid lubricating composition, resin material having a property of being solidified when the resin material in a fluid state is irradiated with an ultraviolet beam is used.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: November 22, 2011
    Assignee: JTEKT Corporation
    Inventors: Kouji Kitahata, Masahiro Tabata, Ryuji Nakata
  • Publication number: 20110168479
    Abstract: A lubricant composition, which is low in friction, does not have an attacking property against polyamide resin, etc., is excellent in heat resistance, and especially does not undergo deterioration or loss of the respective characteristics in a short term when used under a high temperature environment, is provided along with a speed reduction gear and an electric power steering apparatus that use the lubricant composition. The lubricant composition has blended therein a synthetic hydrocarbon oil, a urea thickener, zinc stearate, and a sulfur-based antioxidant. A speed reduction gear has a portion of engagement of a small gear and a large gear filled with the lubricant composition. In an electric power steering apparatus, an output of a steering assisting electric motor is speed reduced and transmitted to a steering mechanism via the speed reduction gear.
    Type: Application
    Filed: October 14, 2009
    Publication date: July 14, 2011
    Applicants: JTEKT CORPORATION, KYODO YUSHI CO., LTD.
    Inventors: Ryuji Nakata, Miwa Hokii, Mitsuhiro Kakizaki, Daisuke Tsutsui
  • Publication number: 20100314959
    Abstract: The invention is aimed, in a rolling bearing device, to improve its durability by appropriately attenuating vibration of a rotating shaft by means of a high level of dumping performance, and thereby to reduce the load imposed on the rolling bearing and/or the overall system. A rolling bearing device of the present invention comprises a rolling bearing (13) including: an inner ring (24) and an outer ring (23) that are disposed so as to be relatively rotatable; and a plurality of rolling elements (25) disposed between the inner ring (24) and the outer ring (23), in which the rolling bearing (13) supports relative rotation between a shaft (14) and a housing (12). Besides, the rolling bearing device comprises, between the rolling bearing (13) and the housing (12), a damper member (60) formed by one or more metal wires (64) that are knitted.
    Type: Application
    Filed: February 7, 2008
    Publication date: December 16, 2010
    Applicant: JTEKT CORPORATION
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akiò Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takehisa Kida
  • Publication number: 20090196743
    Abstract: A sealing structure includes a labyrinth seal provided between a housing and an outer periphery of an end portion of a turbine shaft on a turbine wheel side, and a piston ring seal disposed on a side toward a center of the turbine shaft in an axial direction thereof from a position on the turbine shaft at which the labyrinth seal is provided, and a ring groove is formed along a circumferential direction of the housing in a middle portion of the labyrinth seal to reverse a flow direction of exhaust gas entering from the exhaust passage.
    Type: Application
    Filed: January 9, 2009
    Publication date: August 6, 2009
    Applicant: JTEKT Corporation
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akio Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takehisa Kida
  • Publication number: 20090081057
    Abstract: A turbocharger includes a housing, and a turbine shaft supported in a center hole in the housing through rolling bearings. A tank portion for storing lubrication oil is formed in the housing, and the lubricating oil is supplied from the tank portion to the rolling bearings through wick members extending from the tank portion respectively to the rolling bearings. The wick member includes a bundle of fibers made of a plastics material, and a distal end portion thereof is separated into a fibrous condition, and this distal end portion is held in contact with the bearing. The lubricating oil is supplied to the bearing by a capillary action of the wick member.
    Type: Application
    Filed: September 24, 2008
    Publication date: March 26, 2009
    Applicant: JTEKT CORPORATION
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akio Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takehisa Kida
  • Publication number: 20090081040
    Abstract: A rolling bearing device includes a bearing housing supported on a casing of a turbocharger, and a pair of rolling bearings mounted within the bearing housing and rotatably supporting a turbine shaft. A middle position between the pair of rolling bearings in an axial direction and a central portion of the bearing housing in the axial direction are offset from each other in the axial direction. Each of the rolling bearings includes an inner ring, an outer ring, an intermediate ring interposed between the inner and outer rings, a row of rolling elements rollably interposed between the inner ring and the intermediate ring, and a row of rolling elements rollably interposed between the intermediate ring and the outer ring. The intermediate ring has a damper function to be very slightly displaced or very slightly deformed elastically so as to damp vibration produced during rotation of the turbine shaft.
    Type: Application
    Filed: September 24, 2008
    Publication date: March 26, 2009
    Applicant: JTEKT CORPORATION
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akio Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takehisa Kida
  • Publication number: 20080293598
    Abstract: A solid lubricating composition having resin material is disposed between an outer ring and an inner ring of a ball bearing. As the resin material contained in the solid lubricating composition, resin material having a property of being solidified when the resin material in a fluid state is irradiated with an ultraviolet beam is used.
    Type: Application
    Filed: May 23, 2008
    Publication date: November 27, 2008
    Applicant: JTEKT CORPORATION
    Inventors: Kouji Kitahata, Masahiro Tabata, Ryuji Nakata
  • Publication number: 20080083397
    Abstract: A turbine shaft to which a turbine is fixed is supported by a bearing supporting member via bearings so as to rotate freely. The bearing supporting member is supported by a housing via the damper member. The damper member is formed by knitting a wire made of metal.
    Type: Application
    Filed: September 27, 2007
    Publication date: April 10, 2008
    Applicant: JTEKT CORPORATION
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akio Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takehisa Kida
  • Publication number: 20080083396
    Abstract: A supercharger includes a housing and a turbine shaft supported by the center hole within the housing through rolling bearings. A cooling water jacket within the housing is provided within the main body portion of the housing. The rolling bearings are supplied with lubricant by a tank portion formed within the housing for reserving the lubricant and a wick member provided between the tank portion and the center hole. The wick member 36 includes a core portion configured by a fiber portion and gaps. The lubricant is supplied by the capillary action of the gaps. The porosity of the gap is set to be 45.5% or more and less than 80%.
    Type: Application
    Filed: September 27, 2007
    Publication date: April 10, 2008
    Applicant: JTEKT CORPORATION
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akio Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takehisa Kida
  • Publication number: 20080080966
    Abstract: A turbocharger includes a turbine wheel having a center hole and a turbine shaft having one end secured on a small-diameter inner circumferential surface of the center hole. A large-diameter inner circumferential surface and a large diameter outer circumferential surface are formed to provide a cylindrical clearance opening toward a bearing housing between the center hole and the outer circumferential surface of the turbine shaft.
    Type: Application
    Filed: September 28, 2007
    Publication date: April 3, 2008
    Applicant: JTKET CORPORATION
    Inventors: Hiroshi Ueno, Toshihiko Shiraki, Akio Oshima, Tomonori Nakashita, Masaaki Ohtsuki, Shigenori Bando, Masaki Abe, Ryuji Nakata, Takeshi Kida
  • Patent number: 7008115
    Abstract: A film composed of grease, or a film composed of a thickener for grease, is formed on a portion of the surface of each of components constituting a bearing, the portion being opposed to a polymeric lubricant, whereby sliding frictional resistance between the bearing components and the polymeric lubricant is reduced. In the formation of the film, the assembled bearing in which the film has not yet been formed is immersed into a liquid which is obtained by diluting the grease or the thickener for grease with a solvent, and the solvent is then dried, thereby to highly reproducibly form the film of uniform thickness. In an assembled double-row self-aligning roller bearing wherein an outer race is swingable in a direction perpendicular to the center axis of the bearing, raw materials of a polymeric lubricant are poured into and solidified in two regions of an annular space between the inner and outer races.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: March 7, 2006
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Ryuji Nakata, Hiroshi Komiya
  • Publication number: 20020191876
    Abstract: The invention provides: a polymeric lubricant packed bearing in which the sliding frictional resistance between a polymeric lubricant, and rolling elements or inner and outer races is sufficiently reduced, the rotational torque is small, and melting or damage of the polymeric lubricant due to self heating, and oxidation degradation of the base oil of the polymeric lubricant can be surely prevented from occurring; a method of efficiently producing such a polymeric lubricant packed bearing; and a method which can produce easily and stably a polymeric lubricant packed bearing having a structure in which a polymeric lubricant packed between inner and outer races of a double-row self-aligning roller bearing is axially divided in a gap between two rolling element rows so as to be independently rotatable.
    Type: Application
    Filed: May 15, 2002
    Publication date: December 19, 2002
    Inventors: Ryuji Nakata, Hiroshi Komiya
  • Publication number: 20020098988
    Abstract: The invention provides a solid polymeric lubricant composition which, when the composition is packed in a polymeric lubricant packed rolling bearing, does not increase the rotational torque of the bearing, and prevents voids from remaining when the composition is packed and formed in the bearing, seizure from occurring when the rolling bearing is rotated, and also a polymeric lubricant packed rolling bearing in which such a solid polymeric lubricant composition is packed.
    Type: Application
    Filed: January 23, 2002
    Publication date: July 25, 2002
    Inventor: Ryuji Nakata