Patents by Inventor Yuki Aratsu

Yuki Aratsu 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: 10295001
    Abstract: A control device of a lock-up clutch according to the disclosure is mounted on a vehicle including an engine, a transmission, a fluid-type power transmitting device interposed between the engine and the transmission, and the lock-up clutch provided on the fluid-type power transmitting device. The control device includes: a controller configured to slip-engage the lock-up clutch when accelerator opening of the vehicle changes in an accelerating direction, and configured to make a slip-engagement amount larger when a state of the fluid-type power transmitting device when the accelerator opening of the vehicle changes in the accelerating direction is a driven state than the slip-engagement amount when the state of the fluid-type power transmitting device is a driving state.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: May 21, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takayuki Ando, Seiji Kuwahara, Seiji Masunaga, Tsubasa Kato, Yuki Aratsu
  • Patent number: 9981664
    Abstract: A control device includes a controller configured to perform control to increase a rotational speed of a power source when a brake is stepped on and accelerator opening becomes a predetermined value or larger while a vehicle stops, and thereafter, when the brake is stepped off, engage a plurality of engaging units to transmit a power, and start the vehicle. The controller includes: a parameter obtaining unit configured to obtain a parameter indicating requested acceleration when the vehicle starts; and a slip control unit configured to perform slip control on at least one of the plurality of engaging units such that difference in rotational speed occurs between frictionally engaging elements and set number of engaging units on which the slip control is performed according to a value of the obtained parameter when the vehicle starts.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: May 29, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Seiji Masunaga, Seiji Kuwahara, Takayuki Ando, Yuki Aratsu
  • Patent number: 9975556
    Abstract: A control device for a vehicle is provided. The vehicle includes a transmission and an engine configured to input a torque into the transmission. The transmission has multiple transmission stages and includes a first engagement mechanism and a second engagement mechanism. The control device includes an ECU configured to: (a) control the second engagement mechanism when a second transmission stage is set such that the capacity of torque transmission of the second engagement mechanism is increased and a thrust for separating a first member and a second member of the first engagement mechanism from each other in an axial direction is generated; (b) calculate a decrement in an output torque of the transmission when the capacity of torque transmission of the second engagement mechanism is increased; and (c) increase a torque input into the transmission by the engine based on the decrement in the output torque by controlling the engine.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: May 22, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Seiji Kuwahara, Seiji Masunaga, Takayuki Ando, Yuki Aratsu, Hirotsugu Yoshino
  • Patent number: 9714697
    Abstract: A stepless transmission includes: a transmission shaft; first to fourth power transmission elements; a plurality of rolling bodies clamped by the first and second power transmission elements disposed in confrontation with each other, and tiltably held by the fourth power transmission element; an axial force generator configured to generate axial force in an axial direction for pressing at least one of the first and second power transmission elements against the rolling bodies; and a transmission device configured to change a gear ratio between an input and output by tilting the rolling bodies. Young's moduli of a contact section and an additional contact section, in contact with the rolling body, of one of the first and second power transmission elements are larger than those of other one of the first and second power transmission elements.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: July 25, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroyuki Ogawa, Akira Hibino, Yuki Aratsu
  • Publication number: 20170129490
    Abstract: A control device for a vehicle is provided. The vehicle includes a transmission and an engine configured to input a torque into the transmission. The transmission has multiple transmission stages and includes a first engagement mechanism and a second engagement mechanism. The control device includes an ECU configured to: (a) control the second engagement mechanism when a second transmission stage is set such that the capacity of torque transmission of the second engagement mechanism is increased and a thrust for separating a first member and a second member of the first engagement mechanism from each other in an axial direction is generated; (b) calculate a decrement in an output torque of the transmission when the capacity of torque transmission of the second engagement mechanism is increased; and (c) increase a torque input into the transmission by the engine based on the decrement in the output torque by controlling the engine.
    Type: Application
    Filed: June 24, 2015
    Publication date: May 11, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Seiji KUWAHARA, Seiji MASUNAGA, Takayuki ANDO, Yuki ARATSU, Hirotsugu YOSHINO
  • Patent number: 9488270
    Abstract: A slip control device includes a control unit configured to: calculate a difference value between a target value and a current value or an estimated value of a difference in a rotational speed between an input shaft and an output shaft of a fluid type power transmitting device, or a difference value being a difference between a target value and a current value or an estimated value of a speed of an engine; calculate an inclination of torque capacity of the fluid type power transmitting device with respect to an input parameter at a current value of the input parameter having correlative relationship with the torque capacity of the fluid type power transmitting device; calculate torque capacity of a lock-up clutch by multiplying the inclination by the difference value; and control a slip amount of the lock-up clutch by using the calculated torque capacity.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: November 8, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Seiji Kuwahara, Seiji Masunaga, Takayuki Ando, Yuki Aratsu
  • Publication number: 20160281804
    Abstract: A control device of a lock-up clutch according to the disclosure is mounted on a vehicle including an engine, a transmission, a fluid-type power transmitting device interposed between the engine and the transmission, and the lock-up clutch provided on the fluid-type power transmitting device. The control device includes: a controller configured to slip-engage the lock-up clutch when accelerator opening of the vehicle changes in an accelerating direction, and configured to make a slip-engagement amount larger when a state of the fluid-type power transmitting device when the accelerator opening of the vehicle changes in the accelerating direction is a driven state than the slip-engagement amount when the state of the fluid-type power transmitting device is a driving state.
    Type: Application
    Filed: March 16, 2016
    Publication date: September 29, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takayuki ANDO, Seiji KUWAHARA, Seiji MASUNAGA, Tsubasa KATO, Yuki ARATSU
  • Publication number: 20160221577
    Abstract: A control device includes a controller configured to perform control to increase a rotational speed of a power source when a brake is stepped on and accelerator opening becomes a predetermined value or larger while a vehicle stops, and thereafter, when the brake is stepped off, engage a plurality of engaging units to transmit a power, and start the vehicle. The controller includes: a parameter obtaining unit configured to obtain a parameter indicating requested acceleration when the vehicle starts; and a slip control unit configured to perform slip control on at least one of the plurality of engaging units such that difference in rotational speed occurs between frictionally engaging elements and set number of engaging units on which the slip control is performed according to a value of the obtained parameter when the vehicle starts.
    Type: Application
    Filed: December 29, 2015
    Publication date: August 4, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Seiji MASUNAGA, Seiji KUWAHARA, Takayuki ANDO, Yuki ARATSU
  • Publication number: 20160208913
    Abstract: A slip control device includes a control unit configured to: calculate a difference value between a target value and a current value or an estimated value of a difference in a rotational speed between an input shaft and an output shaft of a fluid type power transmitting device, or a difference value being a difference between a target value and a current value or an estimated value of a speed of an engine; calculate an inclination of torque capacity of the fluid type power transmitting device with respect to an input parameter at a current value of the input parameter having correlative relationship with the torque capacity of the fluid type power transmitting device; calculate torque capacity of a lock-up clutch by multiplying the inclination by the difference value; and control a slip amount of the lock-up clutch by using the calculated torque capacity.
    Type: Application
    Filed: December 22, 2015
    Publication date: July 21, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Seiji KUWAHARA, Seiji MASUNAGA, Takayuki ANDO, Yuki ARATSU
  • Patent number: 9388884
    Abstract: A continuously variable transmission includes: a transmission shaft; first to fourth power transmission elements that have a first rotation center axis coaxial with the transmission shaft; a plurality of rolling members that has a second rotation center axis; a transmission device configured to change a gear ratio between an input side and an output side by tilting each of the rolling members; a rotary shaft that is coupled with one of the first and second power transmission elements, and is provided with a cylindrical section; an annular member that is coupled with the rotary shaft, and configured to form an annular oil reservoir formed of lubricating oil; and a scraping up section configured to scrape up the lubricating oil by rotating in the circumferential direction.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: July 12, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira Hibino, Hiroyuki Ogawa, Yuki Aratsu, Mitsuaki Tomita
  • Patent number: 9388896
    Abstract: A continuously variable transmission includes a shaft, first and second rotary members, a sun roller, a carrier, planetary balls, a gear shifter for changing a gear ratio between input and output by tilting each of the planetary balls, a casing for accommodating these elements, and a lubricating oil supply opening for supplying lubricating oil into the casing. The casing includes a discharge opening for discharging the lubricating oil to the outside of the casing. The discharge opening is provided in a wall of the casing in an axial direction of the shaft and radially outside the lubricating oil supply opening. As seen in the axial direction, the discharge opening is formed either at a position that crosses a contact section between the planetary ball and each of the first and second rotary members or an auxiliary contact section, or radially outside the contact section or the auxiliary contact section.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: July 12, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira Hibino, Hiroyuki Ogawa, Yuki Aratsu
  • Publication number: 20160053873
    Abstract: A continuously variable transmission includes: a transmission shaft; first to fourth power transmission elements that have a first rotation center axis coaxial with the transmission shaft; a plurality of rolling members that has a second rotation center axis; a transmission device configured to change a gear ratio between an input side and an output side by tilting each of the rolling members; a rotary shaft that is coupled with one of the first and second power transmission elements, and is provided with a cylindrical section; an annular member that is coupled with the rotary shaft, and configured to form an annular oil reservoir formed of lubricating oil; and a scraping up section configured to scrape up the lubricating oil by rotating in the circumferential direction.
    Type: Application
    Filed: December 11, 2013
    Publication date: February 25, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira HIBINO, Hiroyuki OGAWA, Yuki ARATSU, Mitsuaki TOMITA
  • Publication number: 20150323058
    Abstract: A continuously variable transmission includes a shaft, first and second rotary members, a sun roller, a carrier, planetary balls, a gear shifter for changing a gear ratio between input and output by tilting each of the planetary balls, a casing for accommodating these elements, and a lubricating oil supply opening for supplying lubricating oil into the casing. The casing includes a discharge opening for discharging the lubricating oil to the outside of the casing. The discharge opening is provided in a wall of the casing in an axial direction of the shaft and radially outside the lubricating oil supply opening. As seen in the axial direction, the discharge opening is formed either at a position that crosses a contact section between the planetary ball and each of the first and second rotary members or an auxiliary contact section, or radially outside the contact section or the auxiliary contact section.
    Type: Application
    Filed: September 24, 2013
    Publication date: November 12, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira HIBINO, Hiroyuki OGAWA, Yuki ARATSU
  • Publication number: 20150285345
    Abstract: A stepless transmission includes: a transmission shaft; first to fourth power transmission elements; a plurality of rolling bodies clamped by the first and second power transmission elements disposed in confrontation with each other, and tiltably held by the fourth power transmission element; an axial force generator configured to generate axial force in an axial direction for pressing at least one of the first and second power transmission elements against the rolling bodies; and a transmission device configured to change a gear ratio between an input and output by tilting the rolling bodies. Young's moduli of a contact section and an additional contact section, in contact with the rolling body, of one of the first and second power transmission elements are larger than those of other one of the first and second power transmission elements.
    Type: Application
    Filed: September 30, 2013
    Publication date: October 8, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroyuki OGAWA, Akira HIBINO, Yuki ARATSU
  • Patent number: 8961363
    Abstract: Provided with first and second rotational members, a sun roller, a plurality of planetary balls sandwiched between the first and second rotational members, a support shaft of each of the planetary balls, a shaft, a carrier, an iris plate and a worm gear for tilting each of the planetary balls, and an input shaft and an output shaft individually fixed to the first and second rotational members, respectively, in which a movable amount of the sun roller relative to the carrier in an axis line direction is set to be smaller than the movable amount of the second rotational member relative to the carrier in the axis line direction when the input shaft is arranged so as to be relatively rotatable on an outer peripheral surface of the output shaft.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: February 24, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takahiro Shiina, Akira Murakami, Hiroyuki Ogawa, Daisuke Tomomatsu, Yuki Aratsu
  • Patent number: 8956262
    Abstract: A continuously variable transmission includes plural planetary balls, a carrier, a sun roller, an input shaft, an output shaft, and thrust bearings sandwiched between respective holding surfaces of the input shaft and the output shaft, wherein the holding surface at a time of rest is formed such that a space between the holding surface and a race on one side of the thrust bearing becomes wider on an outside in a radial direction than on an inside in the radial direction, and the holding surface at the time of rest is formed such that a space between the holding surface and a race on the other side of the thrust bearing becomes wider on the outside in the radial direction than on the inside in the radial direction.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: February 17, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Daisuke Tomomatsu, Akira Murakami, Hiroyuki Ogawa, Yuki Aratsu
  • Publication number: 20150038285
    Abstract: A continuously variable transmission includes a first rotating element, a second rotating element, a rolling member, a support shaft, and a support rotating element. The support rotating element includes a fixed element provided with a first guide portion guiding a first guide end portion, and a movable element provided with a second guide portion guiding a second guide end portion. The support shaft is configured such that: either one of a moving distance of the first guide end portion and a moving distance of the second guide end portion at the time when the support shaft is tilted together with the rolling member is relatively large, and the other one of the moving distances is relatively small; and an outside diameter of that one of the first guide end portion and the second guide end portion which has a relatively large moving distance is relatively larger than an outside diameter of the other one which has a relatively small moving distance.
    Type: Application
    Filed: February 24, 2012
    Publication date: February 5, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yuki Aratsu, Akira Murakami, Hiroyuki Ogawa, Akira Hibino
  • Publication number: 20140235401
    Abstract: A continuously variable transmission includes plural planetary balls, a carrier, a sun roller, an input shaft, an output shaft, and thrust bearings sandwiched between respective holding surfaces of the input shaft and the output shaft, wherein the holding surface at a time of rest is formed such that a space between the holding surface and a race on one side of the thrust bearing becomes wider on an outside in a radial direction than on an inside in the radial direction, and the holding surface at the time of rest is formed such that a space between the holding surface and a race on the other side of the thrust bearing becomes wider on the outside in the radial direction than on the inside in the radial direction.
    Type: Application
    Filed: September 22, 2011
    Publication date: August 21, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Tomomatsu, Akira Murakami, Hiroyuki Ogawa, Yuki Aratsu
  • Publication number: 20140228163
    Abstract: Provided is a continuously variable transmission mechanism of a traction drive type having: a shaft (60) which functions as the center of rotation; relatively rotatable first and second rotating members (10, 20) that are disposed to face each other on the shaft (60) and share a first rotation center axis (R1); plural planetary balls (50) that have a second rotation center axis (R2), are radially disposed around the first rotation center axis (R1) as the center, and are held between the first and second rotating members (10, 20); and an iris plate (80) that changes the gear ratio between an engine-side input shaft (11) and a drive wheel side output shaft (21) by tilting each of the planetary balls (50) with respect to the first rotation center axis (R1). When an engine is started, the gear ratio is controlled to an acceleration side rather than maximum deceleration.
    Type: Application
    Filed: September 22, 2011
    Publication date: August 14, 2014
    Inventors: Yuki Aratsu, Akira Murakami, Hiroyuki Ogawa, Daisuke Tomomatsu
  • Publication number: 20140094339
    Abstract: A continuously variable transmission includes a plurality of planetary balls interposed between a first and second rotating elements on a shaft, an iris plate and a worm gear that tilt the planetary balls, a sun roller that includes a first sun roller that includes a first tubular section having first contact points with the planetary balls and a second tubular section having a smaller outer diameter than the first tubular section and is capable of relative rotation with respect to the shaft and a second sun roller that includes second contact points with the planetary balls and is capable of relative rotation with respect to the first sun roller on an outer peripheral surface of the second tubular section, and thrust bearings that are arranged between the first sun roller and the second sun roller and bear thrust loads transmitted from the planetary balls to the first sun roller and the second sun roller.
    Type: Application
    Filed: June 10, 2011
    Publication date: April 3, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroyuki Ogawa, Daisuke Tomomatsu, Akira Murakami, Takahiro Shiina, Yuki Aratsu