Patents by Inventor Isashi Kashiwagi

Isashi Kashiwagi 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: 20190309801
    Abstract: In a constant velocity joint, a center locus of a first ball rolling on a first outer central portion is inclined such that a distance from a central axis of an outer joint member decreases toward a bottom side of the outer joint member. A center locus of a second ball rolling on a second outer central portion is formed in a linear shape and inclined such that a distance from the central axis of the outer joint member increases toward the bottom side of the outer joint member. A center locus of the second ball rolling on the second outer bottom side portion is formed in an arc shape and disposed in the outer joint member at a position radially inwardly from a tangent at a connecting position between the second outer central portion and the second outer bottom side portion.
    Type: Application
    Filed: March 25, 2019
    Publication date: October 10, 2019
    Applicants: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Isashi KASHIWAGI, Masahito Ikeo, Yoshitaka Shinoda, Hideki Sugiura
  • Publication number: 20190309800
    Abstract: A joint-center-fixed constant velocity joint configured to be provided in a vehicle includes an outer joint member, an inner joint member, a first ball, a second ball, and a cage. While a center of the first ball is moving to a position of the maximum use angle on an opening side from a joint center, a first open angle faces the opening side. While a center of the second ball is moving to a position of the maximum use angle on a bottom side from the joint center, a second open angle is not reversed from a state where the second open angle faces the bottom side to a state where the second open angle faces the opening side.
    Type: Application
    Filed: April 4, 2019
    Publication date: October 10, 2019
    Applicants: JTEKT Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Isashi KASHIWAGI, Masahito Ikeo, Yoshitaka Shinoda, Hideki Sugiura
  • Publication number: 20180119745
    Abstract: A constant velocity joint includes balls each rollably supported by an associated one of outer ball grooves and an associated one of inner ball grooves facing each other such that the inclined direction of the associated outer ball groove relative to a central axis of an outer joint member is opposite to the inclined direction of the associated inner ball groove relative to a central axis of an inner joint member. The inner joint member includes escape portions to allow escape of the balls from the inner ball grooves to a first side of the central axis of the inner joint member. Each of the escape portions is provided at least between an end face at the first side of the central axis of the inner joint member and a first rolling guide lateral surface of the associated inner ball groove that forms an acute angle with the end face.
    Type: Application
    Filed: October 25, 2017
    Publication date: May 3, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Isashi KASHIWAGI, Takashi Okazaki, Tomotaka Minami
  • Publication number: 20170326621
    Abstract: A method is provided for manufacturing an outer ring of a constant velocity joint including an outer ring, an inner rotational member, a torque-transmitting rolling element, and a defining member. The outer ring includes: a first inner peripheral surface to which the defining member is attached; a second inner peripheral surface; and protrusions protruding radially inward of the first inner surface and the second inner peripheral surface so as to restrict axial movement of the inner rotational member and the rolling element. The manufacturing method includes: a plastic working step involving providing a base member; and a bottom removing step involving partially removing a bottom of the base member so as to form a through hole. The plastic working step further involves providing the second inner peripheral surface. The bottom removing step further involves providing the protrusions.
    Type: Application
    Filed: May 3, 2017
    Publication date: November 16, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Isashi KASHIWAGI, Takashi OKAZAKI
  • Publication number: 20160356317
    Abstract: A constant-velocity joint includes: an outer joint member; an inner joint member that is placed in the outer joint member and that can be angled with respect to the outer joint member; and balls that roll between the outer joint member and the inner joint member to transmit torque. First outer larger diameter portions and second outer larger diameter portions are formed alternately in the circumferential direction in the inner peripheral surface of the outer joint member. The center of an arc radius of a track of the center of the ball rolling on the first outer larger diameter portion and the center of an arc radius of a track of the center of the ball rolling on the second outer larger diameter portion are located on different sides with respect to the joint center in the axial direction of the outer joint member.
    Type: Application
    Filed: June 1, 2016
    Publication date: December 8, 2016
    Applicant: JTEKT CORPORATION
    Inventors: Isashi KASHIWAGI, Masahito IKEO, Hideki SUGIURA
  • Publication number: 20100022315
    Abstract: A sliding-type tripod-shaped constant-velocity universal joint that can reduce induced thrust force by preventing the tangent-point back-surface side of rollers from contacting with roller grooves in the case where the rollers and the roller grooves make an angular contact at two locations. An outer peripheral surface of the rollers makes an angular contact with respect to the roller grooves at two locations, and an inner peripheral surface of the rollers is formed as a convex-shaped curve that is directed to the inner side in an axially cross section of the rollers. And, the rollers are made swingable with respect to tripod-shaft portions.
    Type: Application
    Filed: March 7, 2008
    Publication date: January 28, 2010
    Applicant: JTEKT CORPORATION
    Inventors: Yosei Ando, Isashi Kashiwagi, Kazuyuki Ichikawa, Hideki Sugiura
  • Patent number: 7635306
    Abstract: A compact tripod type constant velocity joint with double roller type roller units capable of preventing plastic deformation of snap rings in assembling. In each of the roller units, an outer roller has an inner diameter ‘Do’ of 26.4 mm or less. The inner diameter ‘Do’ (mm) of the outer roller, a groove depth ‘Depth’ (mm) of engaging grooves formed on the outer roller and an outer diameter ‘Ds’ (mm) of the snap rings satisfy the formula below. Then, in a state where the snap rings are seated in the engaging grooves, diametrical gaps of 0.1 mm or more are formed between outer peripheral ends of the snap rings and groove bottoms of the engaging groove. Do+2×Depth?Ds?0.1.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: December 22, 2009
    Assignees: Jtekt Corporation, Nachi - Fujikoshi Corporation
    Inventors: Atsushi Ando, Isashi Kashiwagi, Mitsunori Nakamura, Hiroyuki Sawaki
  • Patent number: 7544131
    Abstract: In a tripod-type constant velocity joint having an inner joint member, an outer joint member, and three roller units, the radius R1, outer width W1, and inner width W2 of the outer periphery cylindrical surface of each roller unit, and the radius R3 of the center hole of each roller unit satisfy the inequalities: 0.5Rtc(1/cos 0.3??1)+(R1?R3)?<W1 and 1.5Rtc(1?cos 0.3?)+(R1?R3)?<W2, where Rtc: the radius of a circle passing through the respective centers of tripod spherical surfaces of the inner joint member, ?: the maximum joint angle between the outer joint member and the inner joint member, and ?: coefficient of friction between each tripod spherical surface and the wall surface of the center hole of the corresponding roller unit.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: June 9, 2009
    Assignee: Yoyoda Koki Kabuhsiki Kaisha
    Inventors: Atsushi Ando, Minoru Wakamatsu, Kazuyuki Ichikawa, Isashi Kashiwagi
  • Patent number: 7540808
    Abstract: A power transmission shaft includes a swaged boot-engaging groove on an outer circumference of thereof. Further, the power transmission shaft includes a reduced diameter portion provided in the vicinity of the boot-engaging groove. The reduced diameter portion is formed by swaging at the same time as the boot-engaging groove is formed.
    Type: Grant
    Filed: March 21, 2006
    Date of Patent: June 2, 2009
    Assignee: JTEKT Corporation
    Inventors: Hiroyuki Iwashita, Tadashi Naganawa, Isashi Kashiwagi
  • Patent number: 7520815
    Abstract: A constant velocity universal joint includes an inner race having an outer peripheral face on which inner grooves are formed, an outer race having an inner peripheral face on which outer grooves are formed, a plurality of balls each engaging with each pair of inner groove and outer groove, and an annular cage disposed between the inner race and the outer race and including window portions for retaining respective balls. A coefficient of sliding friction between the ball and a rolling face on the inner groove with which the ball is in contact, and a coefficient of sliding friction between the ball and a rolling face on the outer groove with which the ball is in contact are larger than a coefficient of sliding friction between the ball and a sliding face on the window portion with which the ball is in contact.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: April 21, 2009
    Assignee: JTEKT Corporation
    Inventors: Kazuyuki Ichikawa, Isashi Kashiwagi, Hiroyuki Iwashita, Atsushi Ando, Junji Ando, Yosei Ando, Hiroyuki Ito
  • Patent number: 7462106
    Abstract: A constant velocity universal unit includes an outer joint member whose inner peripheral face is formed with three guide grooves, an inner joint member including three tripod shafts each formed with a tripod spherical face, three roller units each including an outer peripheral face and an inner peripheral face coaxially formed with each other. The guide groove includes a pair of strip-shaped inner side faces formed with a pair of guide projections having a substantially half arc shape in cross section whose diameter is smaller than a height of the inner side face of the guide groove. The constant velocity universal joint further includes an annular recess formed on a substantially center portion in a height direction of the outer peripheral face of the roller unit and engaging with the pair of guide projections in a rolling manner and rotatable relative to a central axis of the guide projection.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: December 9, 2008
    Assignee: Toyoda Koki Kabushiki Kaisha
    Inventors: Isashi Kashiwagi, Minoru Wakamatsu, Atsushi Ando, Kazuyuki Ichikawa
  • Patent number: 7438771
    Abstract: A steel material for a high strength constant velocity joint intermediate shaft is provided. The steal material may preferably contain C: 0.46 to 0.52%, Si: 0.6 to 0.8%, Mn: 0.7 to 0.9%, S: 0.01 to 0.05%, Mo: 0.3 to 0.5%, B: 0.0005 to 0.005%, Al: 0.002 to 0.05%, and Ti: 0.02 to 0.09%, restricting N to 0.007% or less, Cr to 0.15% or less, and P to 0.02% or less. A structural percentage of bainite+martensite may be provided which is 40% or more. The steal material may have a hardness of 250 HV to 340 HV. A high strength constant velocity joint intermediate shaft made of that steel material may be provided which has a spline-vanishing part with a surface hardness of about 610 HV to 750 HV, and a ratio t/r of an effective hardened layer depth t and radius r of 0.35 to 0.55, having a flat part with a surface hardness of about 630 HV to 770 HV and a ratio t/r of 0.55 to 1.0, and having a core hardness of about 250 HV to 340 HV.
    Type: Grant
    Filed: October 13, 2005
    Date of Patent: October 21, 2008
    Assignees: Nippon Steel Corporation, Toyoda Koki Kabushiki Kaisha
    Inventors: Takashige Nagato, Tatsuro Ochi, Koji Nishi, Yuji Inagaki, Kazuyuki Ichikawa, Isashi Kashiwagi, Toshiyuki Saito
  • Publication number: 20070155515
    Abstract: A compact tripod type constant velocity joint with double roller type roller units capable of preventing plastic deformation of snap rings in assembling. In each of the roller units, an outer roller has an inner diameter ‘Do’ of 26.4 mm or less. The inner diameter ‘Do’ (mm) of the outer roller, a groove depth ‘Depth’ (mm) of engaging grooves formed on the outer roller and an outer diameter ‘Ds’ (mm) of the snap rings satisfy the formula below. Then, in a state where the snap rings are seated in the engaging grooves, diametrical gaps of 0.1 mm or more are formed between outer peripheral ends of the snap rings and groove bottoms of the engaging groove. Do+2×Depth?Ds?0.
    Type: Application
    Filed: December 28, 2006
    Publication date: July 5, 2007
    Applicants: JTEKT Corporation, NACHI-FUJIKOSHI Corporation
    Inventors: Atsushi Ando, Isashi Kashiwagi, Mitsunori Nakamura, Hiroyuki Sawaki
  • Patent number: 7207891
    Abstract: A boot fitting structure is fitted onto an axial component to protect it from a dirty environment including outside dust. The boot has a pair of annular grooves and an annular lip between the pair of annular grooves on an inner surface of the boot. The annular lip does not project from an inner surface toward a centerline of the boot. An annular protuberance is provided between the boot and a clamp, through which clamping force from the clamp is concentrated on the annular lip, so that the annular lip is elastically deformed and pushed toward outside of the axial component. Therefore, the axial component can be inserted into the boot without interference between the annular lip and the axial component. Furthermore, the annular lip is free from damage by interference between the annular lip and the axial component.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: April 24, 2007
    Assignee: Toyoda Koki Kabushiki Kaisha
    Inventors: Isashi Kashiwagi, Masahiro Yoshida
  • Publication number: 20060217209
    Abstract: A power transmission shaft includes a swaged boot-engaging groove on an outer circumference of thereof. Further, the power transmission shaft includes a reduced diameter portion provided in the vicinity of the boot-engaging groove. The reduced diameter portion is formed by swaging at the same time as the boot-engaging groove is formed.
    Type: Application
    Filed: March 21, 2006
    Publication date: September 28, 2006
    Applicant: JTEKT Corporation
    Inventors: Hiroyuki Iwashita, Tadashi Naganawa, Isashi Kashiwagi
  • Publication number: 20060205522
    Abstract: A constant velocity universal joint includes an inner race having an outer peripheral face on which inner grooves are formed, an outer race having an inner peripheral face on which outer grooves are formed, a plurality of balls each engaging with each pair of inner groove and outer groove, and an annular cage disposed between the inner race and the outer race and including window portions for retaining respective balls. A coefficient of sliding friction between the ball and a rolling face on the inner groove with which the ball is in contact, and a coefficient of sliding friction between the ball and a rolling face on the outer groove with which the ball is in contact are larger than a coefficient of sliding friction between the ball and a sliding face on the window portion with which the ball is in contact.
    Type: Application
    Filed: March 8, 2006
    Publication date: September 14, 2006
    Applicant: JTEKT Corporation
    Inventors: Kazuyuki Ichikawa, Isashi Kashiwagi, Hiroyuki Iwashita, Atsushi Ando, Junji Ando, Yosei Ando, Hiroyuki Ito
  • Publication number: 20060116210
    Abstract: A constant velocity universal unit includes an outer joint member whose inner peripheral face is formed with three guide grooves, an inner joint member including three tripod shafts each formed with a tripod spherical face, three roller units each including an outer peripheral face and an inner peripheral face coaxially formed with each other. The guide groove includes a pair of strip-shaped inner side faces formed with a pair of guide projections having a substantially half arc shape in cross section whose diameter is smaller than a height of the inner side face of the guide groove. The constant velocity universal joint further includes an annular recess formed on a substantially center portion in a height direction of the outer peripheral face of the roller unit and engaging with the pair of guide projections in a rolling manner and rotatable relative to a central axis of the guide projection.
    Type: Application
    Filed: November 10, 2005
    Publication date: June 1, 2006
    Applicant: TOYODA KOKI KABUSHIKI KAISHA
    Inventors: Isashi Kashiwagi, Minoru Wakamatsu, Atsushi Ando, Kazuyuki Ichikawa
  • Publication number: 20060108026
    Abstract: A power transmission shaft which can be evaluated on torsional fatigue strength based on a management indicator different from compressive residual stress in an outer surface. In a power transmission shaft having outer circumferential serrations 1a, 1b, torsional fatigue strength is evaluated by using compressive residual stress at a depth of 30 ?m (and 50 ?m) from an outer surface of a rising portion of each concave of the outer circumferential serrations 1a, 1b as a management indicator. A high torsional fatigue strength can be secured by having a compressive residual stress of 1150 MPa or more at a depth of 30 ?m (and 50 ?m) from the outer surface.
    Type: Application
    Filed: November 18, 2005
    Publication date: May 25, 2006
    Applicant: TOYODA KOKI KABUSHIKI KAISHA
    Inventors: Kazuyuki Ichikawa, Isashi Kashiwagi, Miwa Hokii, Koji Nishi, Toshiyuki Saito
  • Publication number: 20060079336
    Abstract: In a tripod-type constant velocity joint having an inner joint member, an outer joint member, and three roller units, the radius R1, outer width W1, and inner width W2 of the outer periphery cylindrical surface of each roller unit, and the radius R3 of the center hole of each roller unit are determined to satisfy the following two inequalities: 0.5Rtc(1/cos0.3??1)+(R1?R3)?<W1 1.5Rtc(1?cos0.3?)+(R1?R3)?<W2 where Rtc: the radius of a circle passing through the respective centers of tripod spherical surfaces of the inner joint member, ?: the maximum joint angle between the outer joint member and the inner joint member, and ?: coefficient of friction between each tripod spherical surface and the wall surface of the center hole of the corresponding roller unit.
    Type: Application
    Filed: September 26, 2005
    Publication date: April 13, 2006
    Applicant: TOYODA KOKI KABUSHIKI KAISHA
    Inventors: Atsushi Ando, Minoru Wakamatsu, Kazuyuki Ichikawa, Isashi Kashiwagi
  • Publication number: 20060076088
    Abstract: A steel material for a high strength constant velocity joint intermediate shaft is provided. The steal material may preferably contain C: 0.46 to 0.52%, Si: 0.6 to 0.8%, Mn: 0.7 to 0.9%, S: 0.01 to 0.05%, Mo: 0.3 to 0.5%, B: 0.0005 to 0.005%, Al: 0.002 to 0.05%, and Ti: 0.02 to 0.09%, restricting N to 0.007% or less, Cr to 0.15% or less, and P to 0.02% or less. A structural percentage of bainite+martensite may be provided which is 40% or more. The steal material may have a hardness of 250 HV to 340 HV. A high strength constant velocity joint intermediate shaft made of that steel material may be provided which has a spline-vanishing part with a surface hardness of about 610 HV to 750 HV, and a ratio t/r of an effective hardened layer depth t and radius r of 0.35 to 0.55, having a flat part with a surface hardness of about 630 HV to 770 HV and a ratio t/r of 0.55 to 1.0, and having a core hardness of about 250 HV to 340 HV.
    Type: Application
    Filed: October 13, 2005
    Publication date: April 13, 2006
    Inventors: Takashige Nagato, Tatsuro Ochi, Koji Nishi, Yuji Inagaki, Kazuyuki Ichikawa, Isashi Kashiwagi, Toshiyuki Saito