Patents by Inventor Tetsuya Miura

Tetsuya Miura 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: 20210277984
    Abstract: A screw device is provided which can detect damage to a groove of a screw shaft, the damage being hidden by a nut, with a high probability. At least two circulation components are mounted on a nut in such a manner as to form at least two circulation circuits that circulate rolling elements. The nut is provided with a sensor that detects a displacement of a groove of a screw shaft between the adjacent circulation circuits.
    Type: Application
    Filed: June 19, 2019
    Publication date: September 9, 2021
    Inventors: Kazuyoshi MOCHIZUKI, Tetsuya MIURA, Ryuji MURAMATSU, Yusuke TODOROKI
  • Publication number: 20160043677
    Abstract: A rotary electric machine control system 10 includes a controller 70, and a rotor 28 including a first rotor element 40 and a second rotor element 42 which are rotatable inside of the stator 24 and disposed to be separated from each other in axial direction. The first rotor element 40 includes a first magnet and is fixed to a rotary shaft 26. The second rotor element 42 includes a second magnet, and is rotatably provided to the rotary shaft 26. The controller 70 performs vector control of the stator coil current for transition of an inter-rotor phase, a relative phase difference of the second rotor element 42 in relation to the first rotor element 40.
    Type: Application
    Filed: April 1, 2014
    Publication date: February 11, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuya MIURA, Yasuhide YAGYU, Takanori KADOTA
  • Patent number: 8739646
    Abstract: There is provided a roller screw in which a twisted amount of an unloaded return path is reduced. The roller screw has a screw shaft 1 having a spiral roller-rolling surface 1a on an outer peripheral surface thereof; a nut 2 having a spiral loaded roller-rolling surface 2a on an inner peripheral surface thereof, the spiral loaded roller-rolling surface being opposed to the roller-rolling surface 1a of the screw shaft 1; a circulation member 7 arranged in the nut 2 and formed to have an unloaded return path 8 connecting one end and the other end of the loaded roller-rolling surface 2a, whose turn number is less than one, of the nut 2; and a plurality of rollers 4 arranged in a one-turn roller circulation path composed by a loaded roller-rolling path 6 and the unloaded return path 8.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: June 3, 2014
    Assignee: THK Co., Ltd.
    Inventors: Kentaro Nishimura, Tetsuya Miura, Akimasa Yoshida, Soshi Miyahara, Yusuke Todoroki, Takashi Sakuyama
  • Patent number: 8336415
    Abstract: Provided is a roller screw capable of preventing rollers moving from an unloaded return path to a loaded roller rolling path from coming into collision with a scooping portion. The roller screw has: a screw shaft 1 having a spiral roller rolling surface 1a formed on an outer peripheral surface thereof; a nut 2 having a loaded roller rolling surface 2a formed in an inner peripheral surface thereof; a circulation member 3 having an unloaded return path connecting one end of the loaded roller rolling surface 2a of the nut 2 to an opposite end thereof; and a plurality of rollers 4 arranged in a loaded roller rolling path 6 and the unloaded return path.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: December 25, 2012
    Assignee: THK Co., Ltd.
    Inventors: Soshi Miyahara, Masahiko Yoshino, Lina Teng, Tsutomu Togashi, Takashi Sakuyama, Kentaro Nishimura, Tetsuya Miura, Akimasa Yoshida, Yusuke Todoroki
  • Patent number: 8307929
    Abstract: First and second motors have structures different from each other. A control device estimates a first magnet temperature of the first motor and a second magnet temperature of the second motor and controls a drive unit based on the first and second magnet temperatures. The control device estimates the first magnet temperature using a first parameter (the temperature of cooling oil of the first and second motors) and estimates the second magnet temperature using the temperature of the stator of the second motor. Since an appropriate parameter is selected from among a plurality of parameters concerning the state of the first and second motors, the first and second magnet temperatures can be estimated more accurately.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: November 13, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tetsuya Miura, Akira Takasaki
  • Patent number: 8013565
    Abstract: The temperature of a stator coil is measured by a temperature sensor (14), amplified by a stator coil temperature amplifier (21), and transmitted to a vehicle control section (23). Further, motor cooling oil (17) for cooling the outer periphery of the stator cools the stator coil (16) along an end coil section of the stator coil (16). The temperature of the motor cooling oil raised by the stator coil (16) is measured by a temperature sensor (15) and transmitted also to the vehicle control section (23) via a motor cooling oil temperature amplifier (22). The vehicle control section (23) estimates the temperature of a rotor magnet based on a thermal model (relationship between temperature, a heat production amount, and heat resistance) of the motor cooling oil, the stator coil, and the rotor magnet by using the motor cooling oil temperature and the stator coil temperature as input values and sends a control instruction to a motor control section (24).
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: September 6, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Tetsuya Miura
  • Patent number: 7960886
    Abstract: A rotating electric machine includes a stator having a plurality of winding phases formed by distributed winding, a rotor having a plurality of magnetic poles and an outer circumference facing the stator, a first groove formed in the outer circumference of the rotor, a second groove formed in a position opposite to reference magnetic poles closest to the first groove, of the magnetic poles, with respect to the first groove, and a protrusion positioned between the first groove and the second groove and defined by the first and second grooves, and a ratio of a width half the width of the protrusion in a circumferential direction of the rotor to a width of the first groove and the second groove in the circumferential direction of the rotor is not smaller than 0.37 and not greater than 6.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: June 14, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tetsuya Miura, Yoshiyuki Hisamatsu
  • Patent number: 7893581
    Abstract: First and second connection mechanisms electrically connect power cables extending in the same direction to first and second electric motor neighboring to each other in the extending direction of the power cables, respectively. The first connection mechanism of the first electric motor is arranged in a radially outer portion, and the second connection mechanism of the second electric motor is arranged in a space between the electric motors. Since both the connection mechanisms are located on the opposite sides of a joint surface between the first and second casings accommodating the first and second motors, respectively, the first and second connection mechanisms can be components on the first and second casing sides, respectively. This structure can prevent increase in size in a rotation axis direction, and can improve assembly workability for the motors.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: February 22, 2011
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Aw Co., Ltd.
    Inventors: Tetsuya Miura, Hirotatsu Ihara, Takamasa Takeuchi, Masamitsu Senoo, Akihiro Tanaka, Takafumi Koshida, Tomoo Atarashi
  • Patent number: 7884515
    Abstract: A power transmission unit includes an electric motor including a rotor arranged on an inner circumference of a stator and concentrically with the stator and a transmission mechanism for transmitting power. A portion of a predetermined constructional element of the transmission mechanism protrudes toward the stator or the rotor side coaxially with the stator or the rotor. The rotor is loosely fitted onto an outer circumferential face of the protruding portion, and a clearance is created between an outer circumferential face of the protruding portion and an inner circumferential face of the rotor into which a guide sleeve for guiding the rotor in an axial direction is inserted. The structure improves a convenience in assembling the rotor of the electric motor of the power transmission unit including the electric motor and transmission mechanism.
    Type: Grant
    Filed: March 22, 2007
    Date of Patent: February 8, 2011
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin AW Co., Ltd.
    Inventors: Hirotatsu Ihara, Tetsuya Miura, Satoru Kasuya, Masashi Kito
  • Publication number: 20100282011
    Abstract: There is provided a roller screw in which a twisted amount of an unloaded return path is reduced. The roller screw has a screw shaft 1 having a spiral roller-rolling surface is on an outer peripheral surface thereof; a nut 2 having a spiral loaded roller-rolling surface 2a on an inner peripheral surface thereof, the spiral loaded roller-rolling surface being opposed to the roller-rolling surface is of the screw shaft 1; a circulation member 7 arranged in the nut 2 and formed to have an unloaded return path 8 connecting one end and the other end of the loaded roller-rolling surface 2a, whose turn number is less than one, of the nut 2; and a plurality of rollers 4 arranged in a one-turn roller circulation path composed by a loaded roller-rolling path 6 and the unloaded return path 8.
    Type: Application
    Filed: November 14, 2008
    Publication date: November 11, 2010
    Applicant: THK CO., LTD.
    Inventors: Kentaro Nishimura, Tetsuya Miura, Akimasa Yoshida, Soshi Miyahara, Yusuke Todoroki, Takashi Sakuyama
  • Publication number: 20100263467
    Abstract: Provided is a roller screw capable of preventing rollers moving from an unloaded return path to a loaded roller rolling path from coming into collision with a scooping portion. The roller screw has: a screw shaft 1 having a spiral roller rolling surface la formed on an outer peripheral surface thereof; a nut 2 having a loaded roller rolling surface 2a formed in an inner peripheral surface thereof; a circulation member 3 having an unloaded return path connecting one end of the loaded roller rolling surface 2a of the nut 2 to an opposite end thereof; and a plurality of rollers 4 arranged in a loaded roller rolling path 6 and the unloaded return path.
    Type: Application
    Filed: October 29, 2008
    Publication date: October 21, 2010
    Applicant: THK CO., LTD.
    Inventors: Soshi Miyahara, Masahiko Yoshino, Lina Teng, Tsutomu Togashi, Takashi Sakuyama, Kentaro Nishimura, Tetsuya Miura, Akimasa Yoshida, Yusuke Todoroki
  • Publication number: 20100181864
    Abstract: A rotating electric machine includes a stator having a plurality of winding phases formed by distributed winding, a rotor having a plurality of magnetic poles and an outer circumference facing the stator, a first groove formed in the outer circumference of the rotor, a second groove formed in a position opposite to reference magnetic poles closest to the first groove, of the magnetic poles, with respect to the first groove, and a protrusion positioned between the first groove and the second groove and defined by the first and second grooves, and a ratio of a width half the width of the protrusion in a circumferential direction of the rotor to a width of the first groove and the second groove in the circumferential direction of the rotor is not smaller than 0.37 and not greater than 6.
    Type: Application
    Filed: June 10, 2008
    Publication date: July 22, 2010
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuya Miura, Yoshiyuki Hisamatsu
  • Publication number: 20100140002
    Abstract: First and second motors have structures different from each other. A control device estimates a first magnet temperature of the first motor and a second magnet temperature of the second motor and controls a drive unit based on the first and second magnet temperatures. The control device estimates the first magnet temperature using a first parameter (the temperature of cooling oil of the first and second motors) and estimates the second magnet temperature using the temperature of the stator of the second motor. Since an appropriate parameter is selected from among a plurality of parameters concerning the state of the first and second motors, the first and second magnet temperatures can be estimated more accurately.
    Type: Application
    Filed: February 12, 2008
    Publication date: June 10, 2010
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuya Miura, Akira Takasaki
  • Publication number: 20090284202
    Abstract: The temperature of a stator coil is measured by a temperature sensor (14), amplified by a stator coil temperature amplifier (21), and transmitted to a vehicle control section (23). Further, motor cooling oil (17) for cooling the outer periphery of the stator cools the stator coil (16) along an end coil section of the stator coil (16). The temperature of the motor cooling oil raised by the stator coil (16) is measured by a temperature sensor (15) and transmitted also to the vehicle control section (23) via a motor cooling oil temperature amplifier (22). The vehicle control section (23) estimates the temperature of a rotor magnet based on a thermal model (relationship between temperature, a heat production amount, and heat resistance) of the motor cooling oil, the stator coil, and the rotor magnet by using the motor cooling oil temperature and the stator coil temperature as input values and sends a control instruction to a motor control section (24).
    Type: Application
    Filed: March 7, 2008
    Publication date: November 19, 2009
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventor: Tetsuya Miura
  • Publication number: 20090273247
    Abstract: A drive device for an electric vehicle, having a structure where a stator is received inside a motor receiving cover to allow an inner cable, connected to the stator, to be led out to the transmission mechanism case side. This enables a projection to be provided on the transmission mechanism case side of the motor receiving cover, and also enables a female connector, connected to the inner cable, to be provided at the projection. The drive device for an electric vehicle has enhanced mountability.
    Type: Application
    Filed: May 31, 2007
    Publication date: November 5, 2009
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuya Miura, Wataru Funatsu
  • Publication number: 20090256437
    Abstract: First and second connection mechanisms electrically connect power cables extending in the same direction to first and second electric motor neighboring to each other in the extending direction of the power cables, respectively. The first connection mechanism of the first electric motor is arranged in a radially outer portion, and the second connection mechanism of the second electric motor is arranged in a space between the electric motors. Since both the connection mechanisms are located on the opposite sides of a joint surface between the first and second casings accommodating the first and second motors, respectively, the first and second connection mechanisms can be components on the first and second casing sides, respectively. This structure can prevent increase in size in a rotation axis direction, and can improve assembly workability for the motors.
    Type: Application
    Filed: July 11, 2007
    Publication date: October 15, 2009
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Tetsuya Miura, Hirotatsu Ihara, Takamasa Takeuchi, Masamitsu Senoo, Akihiro Tanaka, Takafumi Koshida, Tomoo Atarashi
  • Publication number: 20090115263
    Abstract: To improve a convenience in assembling a rotor of an electric motor of a power transmission unit comprising the electric motor and a transmission mechanism. For this purpose, in the power transmission unit comprising an electric motor 2 having a rotor 13 arranged on an inner circumference of a stator 12 and concentrically with the stator 12 and a transmission mechanism 1 for transmitting power, a portion of a predetermined constructional element 7 of the transmission mechanism 1 protrudes toward the stator 12 or the rotor 13 side coaxially with the stator 12 or the rotor 13. The rotor 13 is loosely fitted onto an outer circumferential face of the protruding portion 7, and a clearance C is created between an outer circumferential face of the protruding portion 7 and an inner circumferential face of the rotor 13 into which a guide sleeve for guiding the rotor 13 in an axial direction is inserted.
    Type: Application
    Filed: March 22, 2007
    Publication date: May 7, 2009
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Hirotatsu Ihara, Tetsuya Miura, Satoru Kasuya, Masashi Kito
  • Publication number: 20090108688
    Abstract: A bus bar (263) identified as a led-out conductor portion led out from a coil end (262) of a motor generator identified as an electrical apparatus, and a feeding terminal block (220) disposed at a spacing from the bus bar (263) and having a cable (3A) connected thereto, are connected by a connecting member (4). The connecting member (4) has a bent shape as a whole, and includes a misalignment absorbing portion (46) which is provided by bending a part of the connecting member (4) and is deformable to absorb misalignment between the bus bar (263) and the feeding terminal block (220).
    Type: Application
    Filed: May 14, 2007
    Publication date: April 30, 2009
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Tetsuya Miura
  • Patent number: 6999428
    Abstract: A CDMA (Code Division Multiple Access) transmitter/receiver of the present invention includes a SIR (Signal-to-Interference Ratio) calculator for calculating SIRs of a received signal slot by slot. A command generating circuit generates, when the SIR decreases or increases, a transmission power control command that causes a station, which is sending the received signal, to lower or raise transmission power or generates, when the SIR continuously decreases over a preselected number of slots, a transmission power control-OFF command for interrupting transmission power control. The transmission power control command or the transmission power control-OFF command is inserted in a radio frame to be sent to the above station.
    Type: Grant
    Filed: April 3, 2001
    Date of Patent: February 14, 2006
    Assignee: NEC Corporation
    Inventor: Tetsuya Miura
  • Patent number: 6704347
    Abstract: In a CDMA receiver used in a CDMA cellular mobile telephone system, a searcher which is used to determine reception timing of a plurality of finger processing portions is operated in a time division fashion to enable wide searching range without any expansion of a size. Specifically, a plurality of correlators and/or adders are controlled in a time division fashion to decrease the number of the correlators and/or the adders together with registers for storing integrated correlation value signals.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: March 9, 2004
    Assignee: NEC Corporation
    Inventor: Tetsuya Miura