Patents by Inventor Kippei MATSUDA

Kippei MATSUDA 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: 20200347929
    Abstract: A transmission controller of a toroidal continuously variable transmission includes a gain setting unit that adjusts a gain of closed-loop control for calculating a target value of a roller position in accordance with a change in a rotation speed of a disc in a first rotation speed range and a second rotation speed range higher than the first rotation speed range. The gain setting unit changes, in the first rotation speed range, the gain so that sensitivity of the closed-loop control decreases with an increase in the rotation speed, and changes, in the second rotation speed range, the gain so that a rate of decrease in the sensitivity of the closed-loop control with the increase in the rotation speed is smaller than that in the first rotation speed range.
    Type: Application
    Filed: August 21, 2018
    Publication date: November 5, 2020
    Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kippei MATSUDA, Shouji MIYANISHI, Kenichi NAKASHIMA
  • Publication number: 20200271200
    Abstract: A pressing device for a toroidal continuously variable transmission, comprises: a disk having a toroidal curved surface and a first cam surface; a cam plate having a cylindrical portion, and an outward facing flange portion having a second cam surface; and a plurality of rolling bodies. The cylindrical portion has a cylinder portion, a projection projecting inward in the radial direction in one axial end portion of the cylinder portion and having a step surface, and an oil supply passage. At least a part of a radial inside opening of the oil supply passage opens to a portion of the cylinder portion positioned further on the other side in the axial direction than the step surface. The oil supply passage has an oil-passage hole penetrating the cylinder portion and an oil-passage groove continuous with the oil-passage hole and recessed from the step surface.
    Type: Application
    Filed: November 7, 2018
    Publication date: August 27, 2020
    Inventors: Masahiro KITA, Kippei MATSUDA, Hideyuki IMAI, Kenichiro TANAKA
  • Patent number: 10746267
    Abstract: A toroidal continuously variable transmission includes a preload spring disposed between a rotary assembly including a first disc and a pressing device, and a driving force transmission shaft, and a thrust bearing disposed between a first member and the preload spring, the first member being one of the rotary assembly and the driving force transmission shaft. In a direction of an axis line, a gap is formed between a second member and the thrust bearing, the second member being the other of the rotary assembly and the driving force transmission shaft. A dimension of the gap in the direction of the axis line is less than a deformation amount of the preload spring in the direction of the axis line, at an elastic limit.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: August 18, 2020
    Assignees: KAWASAKI JUKOGYO KABUSHIKI KAISHA, NSK LTD.
    Inventors: Kippei Matsuda, Hideyuki Imai, Kenichiro Tanaka, Kenji Komatsu, Eiji Inoue, Tomohiro Inoue, Daiki Shirota, Masahiro Kita
  • Patent number: 10724613
    Abstract: In a transmission device, a power roller transmits a rotational driving force from an input disc to an output disc in a transmission ratio (transmission gear ratio) corresponding to a tilt motion angle. The power roller allows the transmission ratio to be changed in such a manner that the position of the trunnion on which the power roller is tiltably supported is changed by a trunnion drive mechanism. Hydraulic oil is supplied from a hydraulic pump to the trunnion drive mechanism via a direction selector valve. The direction selector valve selects a flow direction of the hydraulic oil to supply the hydraulic oil to a speed reduction chamber or a speed increase chamber of the trunnion drive mechanism, and discharge the hydraulic oil from the other. In a case where a discharge condition is met, the controller controls a movement of the discharge valve to discharge the hydraulic oil from the speed increase chamber.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: July 28, 2020
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kenji Komatsu, Kenichiro Tanaka, Shogo Fuchiwaki, Tatsuhiko Goi, Kippei Matsuda
  • Publication number: 20200182351
    Abstract: A position controller includes: an oil temperature acquisition unit that acquires information on an oil temperature of a hydraulic actuator; a position acquisition unit that acquires an actual value of an operation position of an object; a position control unit that calculates an operation command value for a control valve of the hydraulic actuator by closed-loop control so as to reduce a deviation between a target value of the operation position of the object and the actual value; and a gain setting unit that changes at least one gain of the closed-loop control so that sensitivity of the closed-loop control increases as the oil temperature decreases.
    Type: Application
    Filed: May 16, 2018
    Publication date: June 11, 2020
    Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Shuma KOBAYASHI, Kippei MATSUDA, Satoshi OOTSUKI, Kenichi NAKASHIMA, Hideyuki IMAI, Akihito ABE
  • Publication number: 20200183431
    Abstract: A position controller that performs position control by outputting a drive signal to a control valve of a hydraulic actuator that changes an operation position of an object, includes: a position acquisition unit that acquires an actual value of an operation position of the object; a position control unit that calculates an operation command value for the control valve by closed-loop control so as to reduce a deviation between a target value of the operation position of the object and the actual value; and a vibration wave application unit that applies a vibration wave to a signal of the closed-loop control so that the operation command value vibrates at a predetermined frequency at start of the closed-loop control.
    Type: Application
    Filed: May 16, 2018
    Publication date: June 11, 2020
    Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kippei MATSUDA, Shuma KOBAYASHI, Satoshi OOTSUKI, Kenichi NAKASHIMA, Hideyuki IMAI, Akihito ABE
  • Publication number: 20200063837
    Abstract: Provided is a pressing device for a toroidal continuously variable transmission that is capable of sufficiently supplying lubrication oil to all rollers inside a pocket, and is capable of suppressing the occurrence of fretting wear on the rolling surfaces of the rollers, a first cam surface and a second cam surface. An oil passage 28 is provided for supplying lubrication oil to the inside of each pocket 25 in the inside portion in the radial direction of a retainer 14 that holds a plurality of more than one roller 13 arranged in a row in the radial direction. The center axis O29 of a discharge port 29 that is provided on an end portion on the downstream side of the oil passage 28 and that opens to the inside surface in the radial direction of the pocket 25 is inclined toward the front side in the rotational direction of the retainer 14 with respect to the center axis of the pocket 25.
    Type: Application
    Filed: March 20, 2018
    Publication date: February 27, 2020
    Inventors: Hirofumi ITAGAKI, Masahiro KITA, Kippei MATSUDA, Kenichiro TANAKA, Hideyuki IMAI, Kenji KOMATSU
  • Publication number: 20200011404
    Abstract: Provided is a pressing device for toroidal continuously variable transmission capable of reducing hysteresis that occurs between torque and pressing force. An intermediate sliding member 27 is provided in at least one location of a portion between an end surface on the outside in the radial direction of the retainer 13 of the roller 14 arranged on the outermost side in the radial direction and an inside surface of the pocket 25 on the outside in the radial direction, and a portion between an end surface on the outside in the radial direction of the retainer 13 of one roller 14 of adjoining rollers 14 in the radial direction and an end surface on the inside in the radial direction of the retainer 13 of another roller 14. As a result, the contact area of a sliding contact portion 32 is made smaller than in a case where an intermediate sliding member 27 is not provided.
    Type: Application
    Filed: March 20, 2018
    Publication date: January 9, 2020
    Inventors: Hirofumi ITAGAKI, Masahiro KITA, Kippei MATSUDA, Kenichiro TANAKA, Hideyuki IMAI, Kenji KOMATSU
  • Publication number: 20190277375
    Abstract: A toroidal continuously variable transmission includes a preload spring disposed between a rotary assembly including a first disc and a pressing device, and a driving force transmission shaft, and a thrust bearing disposed between a first member and the preload spring, the first member being one of the rotary assembly and the driving force transmission shaft. In a direction of an axis line, a gap is formed between a second member and the thrust bearing, the second member being the other of the rotary assembly and the driving force transmission shaft. A dimension of the gap in the direction of the axis line is less than a deformation amount of the preload spring in the direction of the axis line, at an elastic limit.
    Type: Application
    Filed: October 24, 2017
    Publication date: September 12, 2019
    Applicants: KAWASAKI JUKOGYO KABUSHIKI KAISHA, NSK LTD.
    Inventors: Kippei MATSUDA, Hideyuki IMAI, Kenichiro TANAKA, Kenji KOMATSU, Eiji INOUE, Tomohiro INOUE, Daiki SHIROTA, Masahiro KITA
  • Publication number: 20190277374
    Abstract: A toroidal continuously variable transmission includes a first disc and a second disc disposed so that the first disc and the second disc are rotatable around a common rotational axis line, the first disc and the second disc facing each other; a power roller which is tiltably disposed between the first disc and the second disc; a pressing device of a loading cam type, the pressing device including a cam plate which is rotatable around the rotational axis line, and a roller unit including at least one roller sandwiched between a cam surface of the second disc and a cam surface of the cam plate; and a cam plate support supporting a back surface of the cam plate, the back surface being opposite to the cam surface of the cam plate, at a radial position conforming to a radial position of at least a portion of the roller unit.
    Type: Application
    Filed: October 24, 2017
    Publication date: September 12, 2019
    Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kippei MATSUDA, Hideyuki IMAI, Kenichiro TANAKA, Tetsuya MATSUOKA
  • Publication number: 20190234496
    Abstract: The purpose of the invention is to achieve a structure that can be easily made smaller while maintaining transmission efficiency and durability. An inner disk 8b is supported around a sleeve 5a so as to be able to rotate relative to a rotational shalt 2b and the sleeve 5a by way of a pair of ball bearings 33 having a lace-to-face type contact angle. A pair of conical disc springs 36 are held between the inner face of an outer ring 35 of each of the pair of ball bearings 33 and an inner diameter side step face 30 on each of a pair of disk elements 7a, and a preload in the axial direction is applied to the pair of ball bearings 33 by elastically pressing the outer ring 35 to the outside.
    Type: Application
    Filed: November 9, 2017
    Publication date: August 1, 2019
    Inventors: Takeshi NISHIMURA, Kippei MATSUDA, Hideyuki IMAI, Akihito ABE
  • Publication number: 20190101193
    Abstract: A toroidal continuously variable transmission including input and output discs disposed to face each other so that a rotational axis of the input disc and a rotational axis of the output disc conform, each of the discs having a concave contact surface; a power roller sandwiched between the contact surfaces of discs so that the power roller is tiltable, the power roller transmitting a rotational driving force of the input disc to the output disc with a transmission ratio corresponding to a tilt motion angle; and a pressing device which presses one of the discs toward the other. When viewed from a direction of a tilt motion axis lof the power roller, the contact surface of at least one of discs has a region with a curvature that is larger than a curvature of a tilt motion trajectory of a contact surface of the power roller.
    Type: Application
    Filed: April 6, 2016
    Publication date: April 4, 2019
    Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kippei MATSUDA, Hideyuki IMAI, Kenichiro TANAKA
  • Publication number: 20180066735
    Abstract: In a transmission device, a power roller transmits a rotational driving force from an input disc to an output disc in a transmission ratio (transmission gear ratio) corresponding to a tilt motion angle. The power roller allows the transmission ratio to be changed in such a manner that the position of the trunnion on which the power roller is tiltably supported is changed by a trunnion drive mechanism. Hydraulic oil is supplied from a hydraulic pump to the trunnion drive mechanism via a direction selector valve. The direction selector valve selects a flow direction of the hydraulic oil to supply the hydraulic oil to a speed reduction chamber or a speed increase chamber of the trunnion drive mechanism, and discharge the hydraulic oil from the other. In a case where a discharge condition is met, the controller controls a movement of the discharge valve to discharge the hydraulic oil from the speed increase chamber.
    Type: Application
    Filed: March 8, 2016
    Publication date: March 8, 2018
    Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kenji KOMATSU, Kenichiro TANAKA, Shogo FUCHIWAKI, Tatsuhiko GOI, Kippei MATSUDA