Patents by Inventor Shouji Yokoyama

Shouji Yokoyama 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).

  • Patent number: 9670996
    Abstract: Construction of a toroidal continuously-variable transmission is achieved that simplifies the manufacture of parts, management of parts and assembly work, is able to easily reduce costs, stabilizes speed change operations, and is processed easily. An outer ring 16b of a thrust rolling bearing is supported so as to be able to pivotally displace by engaging a concave section 24 that is provided on the outside surface of the outer ring 16b with a cylindrical convex surface 22 of a support beam 23a of a trunnion 7b. Displacement of the outer ring 16b in the axial direction of the support beam 23a is limited by engaging a concave groove 27 that is formed around the inside surface of the concave section 24 in the circumferential direction around the support beam 23a with a protrusion 28 that is formed around the outer-circumferential surface of the support beam 23a.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: June 6, 2017
    Assignee: NSK Ltd.
    Inventors: Yuya Daikoku, Hiroki Nishii, Shouji Yokoyama, Nobuo Goto, Toshirou Toyoda
  • Patent number: 8950283
    Abstract: A method forms a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die. Letter S shaped concaves are formed on an inner circumferential surface of a nut blank, by pressing by use of a die having a blank holder, a cam driver, cam sliders, and a cylindrical member. The cam driver has inclined surfaces having the same angle of inclination as the cam sliders. The cam sliders have letter S shaped convexes corresponding to the letter S shaped concaves, and are held by through holes, respectively. When the cam driver is pressed from the top thereof, the cam sliders move outwardly in the radial direction, respectively, and the letter S shaped convexes push the inner circumferential surface of the nut blank for plastic deformation.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: February 10, 2015
    Assignee: NSK Ltd.
    Inventors: Atsushi Watanabe, Toru Harada, Shouji Yokoyama, Kiyoshi Ootsuka, Koji Hashimoto, Kazuto Kobayashi, Toshio Nakamura, Shinobu Mogi, Shingo Saitou, Tomofumi Yamashita
  • Publication number: 20150024900
    Abstract: Construction of a toroidal continuously-variable transmission is achieved that simplifies the manufacture of parts, management of parts and assembly work, is able to easily reduce costs, stabilizes speed change operations, and is processed easily. An outer ring 16b of a thrust rolling bearing is supported so as to be able to pivotally displace by engaging a concave section 24 that is provided on the outside surface of the outer ring 16b with a cylindrical convex surface 22 of a support beam 23a of a trunnion 7b. Displacement of the outer ring 16b in the axial direction of the support beam 23a is limited by engaging a concave groove 27 that is formed around the inside surface of the concave section 24 in the circumferential direction around the support beam 23a with a protrusion 28 that is formed around the outer-circumferential surface of the support beam 23a.
    Type: Application
    Filed: February 4, 2013
    Publication date: January 22, 2015
    Inventors: Yuya Daikoku, Hiroki Nishii, Shouji Yokoyama, Nobuo Goto, Toshirou Toyoda
  • Publication number: 20130239400
    Abstract: Provided is a method of manufacturing a variator component comprising a step of performing, on a variator component workpiece, pre-machining of a power transmission surface and spline holes while leaving machining allowance, a step of performing workpiece thermal hardening, a step of performing finish-machining of multiple spline grooves constituting the workpiece spline holes, a step of snugly abutting part of a chuck mounted on a lathe or a grinder into multiple spline grooves and clamping the workpiece coaxially with the rotational axis of the chuck, and a step of performing finish-machining of the power transmission surface of the workpiece using ball spline grooves of the workpiece clamped by the collet chuck as a machining reference.
    Type: Application
    Filed: December 9, 2011
    Publication date: September 19, 2013
    Applicant: NSK Ltd.
    Inventor: Shouji Yokoyama
  • Publication number: 20130220047
    Abstract: A ball screw having a groove-shaped ball return passage has improved durability, ball circulation performance, and working performance. The ball screw is provided with: a threaded shaft having a spiral groove at its outer circumferential surface; a nut having a spiral groove which faces the spiral groove at its inner circumferential surface; a plurality of balls rotatably loaded in a spiral raceway constituted by the two spiral grooves; and a ball circulation groove which returns and circulates the balls from an end point to a start point of the raceway. Further, the edge portions constituted by the two side surfaces of the ball circulation groove and the surfaces which continue from the side surfaces and extend in the axial direction are formed to be rounded.
    Type: Application
    Filed: March 31, 2011
    Publication date: August 29, 2013
    Applicant: NSK LTD
    Inventors: Shouji Yokoyama, Koji Hashimoto, Toru Harada, Shingo Saitou
  • Publication number: 20130139628
    Abstract: A method forms ball recirculation and rolling grooves at an inner circumferential surface of a nut for ball screw use in a state free of deviation in axial, circumferential, and radial nut directions. A flange end face is formed with a concave part, then an inner circumferential surface of a blank and an end face and outer circumferential surface of the flange are continuously ground. Due to this, the coaxiality of the blank inner circumferential surface and the flange outer circumferential surface, and the perpendicularity of the flange end face to the blank inner circumferential surface, are made smaller. The blank is plastically worked to form the ball recirculation groove and is cut to form the ball rolling groove while using the concave part as a phase reference, the end face as an axial direction reference, and the outer circumferential surface as a radial direction reference.
    Type: Application
    Filed: August 4, 2011
    Publication date: June 6, 2013
    Inventors: Shouji Yokoyama, Shingo Saitou, Atsushi Watanabe, Koji Hashimoto
  • Publication number: 20130008275
    Abstract: A method forms a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die. Letter S shaped concaves are formed on an inner circumferential surface of a nut blank, by pressing by use of a die having a blank holder, a cam driver, cam sliders, and a cylindrical member. The cam driver has inclined surfaces having the same angle of inclination as the cam sliders. The cam sliders have letter S shaped convexes corresponding to the letter S shaped concaves, and are held by through holes, respectively. When the cam driver is pressed from the top thereof, the cam sliders move outwardly in the radial direction, respectively, and the letter S shaped convexes push the inner circumferential surface of the nut blank for plastic deformation.
    Type: Application
    Filed: March 31, 2011
    Publication date: January 10, 2013
    Applicant: NSK Ltd.
    Inventors: Atsushi Watanabe, Toru Harada, Shouji Yokoyama, Kiyoshi Ootsuka, Koji Hashimoto, Kazuto Kobayashi, Toshio Nakamura, Shinobu Mogi, Shingo Saitou, Tomofumi Yamashita
  • Patent number: 4943925
    Abstract: A navigation apparatus having road system data 6 which represents information of connections and coordinates of intersections and roads between intersections, a travel distance sensor 2, steering angle sensor 3, a present position calculating module 4 for calculating the present position with a unit distance between an intersection and the terminal intersection of a going-out road selected at the former intersection. The apparatus is further provided with a module 15 for generating data on the direction of traveling to a destination point at respective intersections, and a guidance outputting module 5. Traveling direction data is made in response to inputting of the destination point, the present position is determined by selecting a going-out road with the present position calculating module with respect to each intersection, and guidance data on the traveling direction at the terminal intersection of the present road is thereafter output.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: July 24, 1990
    Assignee: Aisin AW Co., Ltd.
    Inventors: Shuzo Moroto, Koji Sumiya, Shouji Yokoyama, Mitsuhiro Nimura, Akimasa Nanba
  • Patent number: 4926346
    Abstract: A road image input system for controlling an automotive vehicle includes a pick-up mounted on the vehicle for picking up the image of a road ahead of the traveling vehicle, a sensor for sensing the traveling condition of the vehicle, and an image processor for obtaining information indicative of the road by setting an image processing window on the image which has been picked up and processing data contained within the image processing window. The image processing window is set at a position based on values of the vehicle velocity and the steering angle of the steering wheel.
    Type: Grant
    Filed: December 29, 1986
    Date of Patent: May 15, 1990
    Assignees: Aisin-Warner Kabushiki Kaisha, Kabushiki Kaisha Shinsangyokaihatsu
    Inventor: Shouji Yokoyama
  • Patent number: 4841445
    Abstract: In accordance with the invention, the mounting position of a throttle opening sensor is adjusted in such a manner that the output voltage of the sensor attains a value a value of V.sub.100 at a throttle opening of 100%. When execution of the system program starts, V.sub.0 is stored in memory as initialized voltage data at a throttle opening of 0%. A throttle opening .theta..alpha. corresponding to sensed voltage data V.alpha. is calculated in an arithmetic unit in accordance with the following equation: ##EQU1## The throttle opening - output voltage characteristic may change due to an error in mounting the throttle opening sensor, a change in the length of the throttle cable caused by a temperature variation, or a change in resistance value caused by aging. If such is the case and a voltage V'.sub.0 greater than the previously stored voltage V.sub.O prevailing at the throttle opening of 0% is sensed, then V'.sub.0 is stored in memory as new voltage data corresponding to the throttle opening of 0%.
    Type: Grant
    Filed: August 10, 1987
    Date of Patent: June 20, 1989
    Assignee: Aisin-Warner Kabushiki Kaisha
    Inventors: Masanari Yamamoto, Yasunobu Ito, Shouji Yokoyama
  • Patent number: 4765434
    Abstract: Disclosed is a control apparatus for a four-wheel drive vehicle having a center differential mechanism which allows a difference in rotating speed between front and rear wheels so as to absorb a difference in turning radius developed between the front and rear wheels when the vehicle is cornering, and a center differential clutch for limiting differential action of the center differential mechanism. The control apparatus has front-wheel torque sensor provided on a front-wheel drive shaft. When a negative torque is sensed on the front-wheel side while the vehicle is traveling with a restraint placed upon the differential action of the center differential mechanism, the restraint is reduced or removed automatically. This prevents occurrence of a tight corner braking phenomenon and permits the function of the center differential mechanism to fully manifest itself. The vehicle is kept in a stable and safe traveling condition in which driving force is fully utilized.
    Type: Grant
    Filed: December 29, 1986
    Date of Patent: August 23, 1988
    Assignees: Aisin-Warner Kabushiki Kaisha, Kabushiki Kaisha Shinsangyokaihatsu
    Inventors: Mutumi Kawamoto, Shuzo Moroto, Takashi Yamada, Shouji Yokoyama