Patents by Inventor Mitsugi Yamashita

Mitsugi Yamashita 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: 20180003287
    Abstract: An automatic transmission that includes a speed change mechanism including a gear mechanism that can attain a plurality of shift speeds, and a plurality of friction engagement elements that are selectively engaged to attain each shift speed in the gear mechanism; a hydraulic control device that can regulate engagement pressures to be supplied to hydraulic servos of the plurality of friction engagement elements and that can supply lubricating oil that lubricates the speed change mechanism; and a control unit that sends a command about the engagement pressures to the hydraulic control device to control engagement states of the plurality of friction engagement elements.
    Type: Application
    Filed: January 5, 2016
    Publication date: January 4, 2018
    Applicant: AISIN AW CO., LTD.
    Inventors: Toshihiko AOKI, Mitsugi YAMASHITA, Joji MORIYAMA, Yukio SUGIURA, Hi AN
  • Patent number: 8549959
    Abstract: A hybrid drive system includes an input shaft of an automatic transmission, a clutch, an intermediate shaft, and a first gear disposed on a first shaft coaxial with an engine output shaft. An electric motor and a second gear provided on an output shaft of the electric motor are disposed on a second shaft. A rotation of the engine output shaft is transmitted to the input shaft through the clutch and the intermediate shaft, and a rotation of the electric motor is transmitted to the input shaft through the second gear and the first gear. The intermediate shaft is supported by a first support wall through a bearing. The clutch is disposed between the intermediate shaft and the engine output shaft, and a front side of the input shaft is rotatably supported by a second support wall, and connected to a rear side of the intermediate shaft through a spline.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: October 8, 2013
    Assignee: Aisin AW Co., Ltd.
    Inventors: Satoru Kasuya, Masashi Kito, Yuichi Seki, Yusuke Takahashi, Mitsugi Yamashita
  • Publication number: 20120096985
    Abstract: A hybrid drive system includes an input shaft of an automatic transmission, a clutch, an intermediate shaft, and a first gear disposed on a first shaft coaxial with an engine output shaft. An electric motor and a second gear provided on an output shaft of the electric motor are disposed on a second shaft. A rotation of the engine output shaft is transmitted to the input shaft through the clutch and the intermediate shaft, and a rotation of the electric motor is transmitted to the input shaft through the second gear and the first gear. The intermediate shaft is supported by a first support wall through a bearing. The clutch is disposed between the intermediate shaft and the engine output shaft, and a front side of the input shaft is rotatably supported by a second support wall, and connected to a rear side of the intermediate shaft through a spline.
    Type: Application
    Filed: September 17, 2010
    Publication date: April 26, 2012
    Applicant: AISIN AW CO., LTD.
    Inventors: Satoru Kasuya, Masashi Kito, Yuichi Seki, Yusuke Takahashi, Mitsugi Yamashita
  • Patent number: 8016718
    Abstract: A vehicle drive unit is provided which includes a hydraulic circuit capable of efficiently supplying a hydraulic pressure from an accumulator to a hydraulic servo while minimizing the capacity of the accumulator. In a hydraulic circuit included in a continuously variable transmission, an accumulator is connected through an electromagnetic switch valve to an oil passage connecting a clutch pressure control valve and a manual valve, a one-way valve for allowing oil to flow only in the direction from the clutch pressure control valve toward the accumulator and the forward clutch is provided in the oil passage. The electromagnetic switch valve switches an oil passage to a communicating state when the oil pump is driven and switches the oil passage to a shut-off state when the oil pump is stopped.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: September 13, 2011
    Assignee: Aisin AW Co., Ltd.
    Inventors: Atsuya Ohshima, Shigeo Tsuzuki, Mitsugi Yamashita, Haruki Shirasaka
  • Patent number: 7992661
    Abstract: A hybrid vehicle drive device includes a clutch that transmits and separates a driving force between an engine output shaft and a transmission input shaft; a first electric motor having a first rotor that is connected to an engine output shaft side of the clutch; a second electric motor having a second rotor that is connected to an transmission input shaft side of the clutch; and a radial vibration suppressing device, wherein (1) the first electric motor is connected to the engine output shaft via the radial vibration suppressing device, and (2) the radial vibration suppressing device suppresses a vibration of the engine output shaft in a radial direction.
    Type: Grant
    Filed: July 5, 2006
    Date of Patent: August 9, 2011
    Assignee: Aisin AW Co., Ltd.
    Inventors: Shinichi Nomura, Yasuo Yamaguchi, Mitsugi Yamashita, Takeshi Inuzuka
  • Publication number: 20110152030
    Abstract: A conical friction ring type CVT device configured with a ring interposed between opposing inclined surfaces of first and second friction wheels so as to surround the first wheel. A portion of the ring is submerged in an oil reservoir, and power is transmitted by contact between the ring and the first and second wheels, such that the ring in moves in the axial direction to steplessly changes speed. When the CVT device is mounted in a vehicle, a rotational direction is set such that, during forward travel of the vehicle, opposing, portions of the first and second wheels move upward from below. An oil strainer is disposed on a side of the second wheel opposite the axis of the first wheel with respect to the axis of the second wheel. Furthermore, a guide member is disposed on at least an upper portion of the second wheel.
    Type: Application
    Filed: October 26, 2010
    Publication date: June 23, 2011
    Applicant: AISIN AW CO., LTD.
    Inventors: Mitsugi YAMASHITA, Shoji TAKAHASHI, Hideyuki UMEDA
  • Publication number: 20110143881
    Abstract: A conical friction ring type continuously variable transmission device configured a ring is provided such that it is interposed between opposing inclined surfaces of a first and second conical friction wheels so as to surround the first conical friction wheel. In this configuration, power is transmitted by contact between the ring and the first and second conical friction wheels, which moves the ring in the axial direction to steplessly change speed. A portion of the ring is submerged in an oil reservoir in a lower portion of the space when the ring is moved to any position in the axial direction. An oil guide is disposed on an axial partial region on the small diameter side of the first conical friction wheel, and guides oil raked up from the oil reservoir due to the rotation of the ring toward the first conical friction wheel.
    Type: Application
    Filed: October 26, 2010
    Publication date: June 16, 2011
    Applicant: AISIN AW CO., LTD.
    Inventors: Mitsugi YAMASHITA, Shoji TAKAHASHI, Hideyuki UMEDA
  • Publication number: 20110070996
    Abstract: A conical friction wheel type continuously variable transmission device, wherein speed is steplessly changed by moving a ring in the axial direction. The ring is configured to include a first-side contact surface provided with a linear portion in a cross-section perpendicular to a rotating direction of the ring, and a second-side contact surface provided with a curved portion that is continuous in the cross-section perpendicular to the rotating direction of the ring. A point on the curved portion is positioned offset with respect to a center of the curved portion in a width direction toward a larger diameter portion side of the friction wheel on which the second-side contact surface contacts, and a distance from the point to an edge portion on the small diameter portion side of the curved portion is set longer than a distance from the point to an edge portion on the large diameter portion side.
    Type: Application
    Filed: August 5, 2010
    Publication date: March 24, 2011
    Applicant: AISIN AW CO., LTD.
    Inventors: Mitsugi YAMASHITA, Shoji Takahashi, Misaki Kamiya, Masayuki Uchida
  • Publication number: 20110070995
    Abstract: A hybrid drive system configured with an input shaft and a friction type continuously variable transmission (CVT) device. The CVT includes an input member drivingly connected to the input shaft, and an output member. Rotation of the input member is steplessly changed in speed and transmitted to the output member by a shear force of an oil film interposed at the contact position. The drive system includes an electric motor having a dedicated output shaft, a differential device, and a gear transmission device that is structured from a meshing rotary transmission mechanism. A case includes at least a first space filled with traction oil and accommodating the CVT device, and a second space filled with lubricant oil and accommodating the gear transmission device.
    Type: Application
    Filed: August 5, 2010
    Publication date: March 24, 2011
    Applicant: AISIN AW CO., LTD.
    Inventors: Mitsugi YAMASHITA, Shoji TAKAHASHI, Hideyuki UMEDA
  • Publication number: 20110070990
    Abstract: A drive system with a case divided into two oil-tight compartments. The first compartment is filled with traction oil and accommodates a friction type continuously variable transmission (CVT) device, and a second compartment filled with lubricant oil and a gear transmission device formed from a meshing rotary transmission mechanism. The CVT device includes an input member, an output member, and a ring interposed in such a way that the ring moves in an axial direction to steplessly change speeds. An input or output member of the CVT device includes a first axial portion rotatably supported by the case, and a second axial portion supported on a second side of the partition through a bearing that provides support in a thrust and radial direction. The bearing is mounted to the partition so that an inner race of the bearing is unrotatably connected to the second-side axial portion through a rotation stopper.
    Type: Application
    Filed: August 5, 2010
    Publication date: March 24, 2011
    Applicant: AISIN AW CO., LTD.
    Inventors: Mitsugi YAMASHITA, Shoji Takahashi, Misaki Kamiya, Masayuki Uchida
  • Publication number: 20100184558
    Abstract: A friction type continuously variable transmission including an input side friction wheel drive-coupled to an input shaft, an output side friction wheel drive-coupled to an output shaft, and a friction member pressure-contacting with the input side friction wheel and the output side friction wheel and transmitting motive power with both the friction wheels, wherein a contact position of the friction member with the input side friction wheel and the output side friction wheel is changed to steplessly shift speed of rotation between the input shaft and the output shaft.
    Type: Application
    Filed: December 22, 2009
    Publication date: July 22, 2010
    Applicant: AISIN AW CO., LTD.
    Inventors: Misaki Kamiya, Shoji Takahashi, Mitsugi Yamashita
  • Publication number: 20100167868
    Abstract: There is provided a pressing device (12) capable of, although using two torque cams, setting an appropriate axial force characteristic which is neither excessive nor insufficient. A first torque cam (15) and a second torque cam (20) are disposed in parallel with a transmission path of torque. The first torque cam (15) passes transfer torque in a region (first stage, second stage) where the transfer torque is smaller than a predetermined value (b) to generate an axial force corresponding to the transfer torque. The second torque cam (20) passes transfer torque in a region (third stage) where the transfer torque is larger than the predetermined value (b) to generate an axial force corresponding to the transfer torque.
    Type: Application
    Filed: December 22, 2009
    Publication date: July 1, 2010
    Applicant: AISIN AW CO., LTD.
    Inventors: Misaki Kamiya, Shoji Takahashi, Mitsugi Yamashita
  • Publication number: 20090247352
    Abstract: A partition plate is provided in a case to separate a first space where a CVT is disposed and a second space where a forward/backward travel switching mechanism and a differential gear are disposed. Bearings respectively supporting an input cone and an output cone and formed as pure rolling cylindrical roller bearings are disposed in the first space. A bearing supporting one end of an input shaft and formed as a conical roller bearing capable of receiving thrust force, a bearing supporting an output shaft and formed as a conical roller bearing capable of receiving thrust force, and a bearing supporting one end of the output cone are disposed in the second space. The first space and the second space are sealed by oil seals. The first space is filled with traction oil and the second space is filled with lubricating oil.
    Type: Application
    Filed: March 18, 2009
    Publication date: October 1, 2009
    Applicant: AISIN AW CO., LTD.
    Inventors: Misaki Kamiya, Shoji Takahashi, Mitsugi Yamashita
  • Publication number: 20090143193
    Abstract: A vehicle drive unit is provided which includes a hydraulic circuit capable of efficiently supplying a hydraulic pressure from an accumulator to a hydraulic servo while minimizing the capacity of the accumulator. In a hydraulic circuit included in a continuously variable transmission, an accumulator is connected through an electromagnetic switch valve to an oil passage connecting a clutch pressure control valve and a manual valve, a one-way valve for allowing oil to flow only in the direction from the clutch pressure control valve toward the accumulator and the forward clutch is provided in the oil passage. The electromagnetic switch valve switches an oil passage to a communicating state when the oil pump is driven and switches the oil passage to a shut-off state when the oil pump is stopped.
    Type: Application
    Filed: November 18, 2008
    Publication date: June 4, 2009
    Applicant: AISIN AW CO., LTD.
    Inventors: Atsuya Ohshima, Shigeo Tsuzuki, Mitsugi Yamashita, Haruki Shirasaka
  • Publication number: 20070007059
    Abstract: A hybrid vehicle drive device includes a clutch that transmits and separates a driving force between an engine output shaft and a transmission input shaft; a first electric motor having a first rotor that is connected to an engine output shaft side of the clutch; a second electric motor having a second rotor that is connected to an transmission input shaft side of the clutch; and a radial vibration suppressing device, wherein (1) the first electric motor is connected to the engine output shaft via the radial vibration suppressing device, and (2) the radial vibration suppressing device suppresses a vibration of the engine output shaft in a radial direction.
    Type: Application
    Filed: July 5, 2006
    Publication date: January 11, 2007
    Applicant: AISIN AW CO., LTD.
    Inventors: Shinichi Nomura, Yasuo Yamaguchi, Mitsugi Yamashita, Takeshi Inuzuka
  • Patent number: 6893373
    Abstract: A transmission for a vehicle includes a main transmission (M) and a differential gear mechanism (20). The main transmission has at least two rotating elements (11, 12; 13, 14) each set to a different gear ratio, and the differential gear mechanism has at least three elements (21, 22, 23). There are provided first input means (C-1, C-2) which selectively inputs an input rotation to two rotating elements of the main transmission, and second input means (1, 2, C-3; 1, 2, 4) which connects the two rotating elements to two elements (21, 22) of the differential gear mechanism and inputs the input rotation to the other at least one element (23). Since an intermediate gear ratio with respect to an individual gear ratio is generated by two rotating elements at a time of simultaneously transmitting power to two rotating elements, it is possible to increase the number of shift speeds.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: May 17, 2005
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Mutsumi Kawamoto, Yoshimi Ishihara, Yoshinori Miyaishi, Mitsugi Yamashita, Nobuhiro Hosoi
  • Publication number: 20030148847
    Abstract: A transmission for a vehicle mainly includes a main transmission (M) and a differential gear mechanism (20). The main transmission has at least two rotating elements (11, 12; 13, 14) each set to a different gear ratio, and the differential gear mechanism has at least three elements (21, 22, 23). There are provided first input means (C-1, C-2) which selectively inputs an input rotation to two rotating elements of the main transmission, and second input means (1, 2, C-3; 1, 2, 4) which connects the two rotating elements to two elements (21, 22) of the differential gear mechanism and inputs the input rotation to the other at least one element (23).
    Type: Application
    Filed: December 30, 2002
    Publication date: August 7, 2003
    Inventors: Mutsumi Kawamoto, Yoshimi Ishihara, Yoshinori Miyaishi, Mitsugi Yamashita, Nobuhiro Hosoi
  • Patent number: 6278928
    Abstract: A vehicle control device controls an automatic transmission by utilizing road information stored in a navigation system unit. In response to the road information stored in a data memory, the upper-limit of a shiftable transmission speed range is determined, thereby allowing shift-change only within the restricted transmission range. The actual down-shift is carried out after confirming a decelerating operation by the driver, such as release of the accelerator pedal, thereby providing favorable transmission control in conformity with the driver's intention.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: August 21, 2001
    Assignee: Kabushikikaisha Equos Research
    Inventors: Hideki Aruga, Masao Kawai, Mitsugi Yamashita, Takahiro Iwami, Hideki Nakashima, Shuzo Moroto, Hisanori Shirai
  • Patent number: 5508924
    Abstract: A driving force controller for an electric vehicle calculates the optimal driving force of each driving wheel based on a formula in response to the detected wheel acceleration and the difference between the wheel speed and the vehicle speed, or alternatively calculates the optimal driving force of each driving wheel based on fuzzy theory by using predetermined membership functions pertinent to the wheel acceleration, speed difference and driving force in response to the detected wheel acceleration and speed difference. The driving force controller thereby controls the driving force of the driving wheel in accordance with the calculated driving force, and prevents slipping of the driving wheel.
    Type: Grant
    Filed: March 18, 1993
    Date of Patent: April 16, 1996
    Assignee: Kabushikikaisha Equos Research
    Inventor: Mitsugi Yamashita
  • Patent number: 5382854
    Abstract: A motor drive apparatus for an electric vehicle has a case attached to a vehicle body; an output axle which rotates relative to the case; an electric motor having a magneto stator secured to an inside wall of the case and a rotor which faces the magneto stator with a predetermined clearance and rotates relative to the case; and a planetary gear unit provided inside of the rotor and consisting of three components of a sun gear, a ring gear and a carrier. The electric motor speed is output from the output axle through the planetary gear unit.
    Type: Grant
    Filed: July 22, 1993
    Date of Patent: January 17, 1995
    Assignee: Kabushikikaisha Equos Research
    Inventors: Mutsumi Kawamoto, Satoru Tanaka, Mitsugi Yamashita