Patents by Inventor Goro Tamai

Goro Tamai 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: 10538238
    Abstract: A modular rear drive unit for a hybrid vehicle comprises a torque distributing unit, an electric motor-generator, and a gearing arrangement operatively connecting the electric motor-generator with the torque distributing unit. The modular rear drive unit also includes an integrated housing and rear cradle supporting and surrounding the torque distributing unit, the electric motor-generator, and the gearing arrangement. The integrated housing and rear cradle operatively mounts to the vehicle body.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: January 21, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Shawn H. Swales, Joel M. Maguire, Goro Tamai, Peter J. Savagian
  • Patent number: 10541578
    Abstract: A permanent magnet electric machine (PM machine) for a vehicle or other system includes a rotor assembly, fixed permanent magnets, a stator, an actuator, and one or more repositionable/moveable flux-shunting elements. The flux-shunting element is repositioned to control flux at specific operating points of the PM machine. The rotor assembly has a rotor coaxially surrounding and coupled to a rotor shaft. The permanent magnets are mounted to or in the rotor, and the moveable flux-shunting element is positioned between the rotor shaft and a respective one of the permanent magnets. Inboard and outboard ends of each respective permanent magnet may be oriented toward the rotor shaft and stator, respectively. The actuator selectively positions the moveable flux-shunting element at one or more operating points of the PM machine to vary reluctance in a magnetic circuit formed by the stator and rotor assembly.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: January 21, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Goro Tamai, Craig S. Ross
  • Publication number: 20200001699
    Abstract: A parallel (P2) hybrid electric vehicle (HEV) powertrain assembly includes a torque converter and a motor-generator unit (MGU). The parallel hybrid electric vehicle (HEV) powertrain assembly can be equipped in a rear wheel drive (RWD) powertrain architecture, or in another architecture arrangement of the powertrain. The torque converter includes an impeller and a turbine. The motor-generator unit includes a rotor and a stator. The torque converter and the motor-generator unit exhibit an at least partially axially overlapping relationship with respect to each other.
    Type: Application
    Filed: June 29, 2018
    Publication date: January 2, 2020
    Inventors: Shawn H. Swales, Goro Tamai
  • Patent number: 10505538
    Abstract: A switching circuit includes a semiconductor switch having a Gate terminal, and includes first, second, third, and fourth Gate resistors. The Gate resistors have upstream and downstream ends relative to a location of the semiconductor switch or a driven load. The downstream ends connect to the Gate terminal. First, second, third, and fourth buffer switches have Gate terminals and Source terminals, with the Source terminals connected to the upstream ends of the first, second, third, and fourth Gate resistors, respectively. An optional Gate driver integrated circuit (IC) connects to the Gate terminals of the buffer switches. A microcontroller, responsive to circuit measurements, selects switching control values and Gate resistor identities based on the measurements, and transmits switching control signals and a Gate resistor selection signal to select on/off states of the buffer switches and an optimum switching speed for the semiconductor switch.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: December 10, 2019
    Assignee: GM Global Technology Operations LLC
    Inventors: Mohammed K Alam, Mohammad N. Anwar, Syed M. Kadry, Korobi Basher, Goro Tamai, William R. Cawthorne, Subramanian Vadula
  • Patent number: 10486517
    Abstract: A planetary gear assembly for transferring torque in a transmission includes first and second planetary gear sets, each including a ring gear, a sun gear, and a carrier bearing a plurality of planet gears. A bridge portion connects a first carrier of the first planetary gear set to a second ring gear of the second planetary gear set. The bridge portion may be disposed radially outward of the first sun gear, and the bridge portion may be connected to an outer side of the first carrier. In some examples, a first ring bearing assembly is constrained by the first ring gear and the bridge structure; a first carrier bearing assembly is constrained by a first case portion and a bridge extension extending from the first carrier; and a second ring bearing assembly is constrained by a second case portion and a second bridge extension extending from the second ring gear.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: November 26, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Boris Burgman, Goro Tamai, John A Diemer
  • Publication number: 20190232942
    Abstract: A system and method are provided for placing a hybrid vehicle having a plurality of electric propulsion motors into an operating state in anticipation of a vehicle event, the method may include the steps of: monitoring roadway traffic and conditions surrounding a vehicle using one or more vehicle sensors and/or wireless communications; anticipating a vehicle propulsion operation change based on the monitored roadway traffic and conditions; in response to anticipating the vehicle propulsion operation change, obtaining a present propulsion operating state; and carrying out an anticipatory vehicle propulsion system transition before receiving a vehicle propulsion operation change request.
    Type: Application
    Filed: January 30, 2018
    Publication date: August 1, 2019
    Inventors: Jinming Liu, Lan Wang, Goro Tamai, Norman K. Bucknor
  • Publication number: 20190207446
    Abstract: A permanent magnet electric machine (PM machine) for a vehicle or other system includes a rotor assembly, fixed permanent magnets, a stator, an actuator, and one or more repositionable/moveable flux-shunting elements. The flux-shunting element is repositioned to control flux at specific operating points of the PM machine. The rotor assembly has a rotor coaxially surrounding and coupled to a rotor shaft. The permanent magnets are mounted to or in the rotor, and the moveable flux-shunting element is positioned between the rotor shaft and a respective one of the permanent magnets. Inboard and outboard ends of each respective permanent magnet may be oriented toward the rotor shaft and stator, respectively. The actuator selectively positions the moveable flux-shunting element at one or more operating points of the PM machine to vary reluctance in a magnetic circuit formed by the stator and rotor assembly.
    Type: Application
    Filed: January 2, 2018
    Publication date: July 4, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Goro Tamai, Craig S. Ross
  • Publication number: 20190207447
    Abstract: A permanent magnet electric machine (PM machine) includes a rotor with rotatable magnets and a stator defining an air gap with the rotor. An actuator rotates the rotatable magnets at predetermined operating points through an angular distance sufficient for changing magnetic pole orientations of the rotatable magnets, and thus modifies magnetic flux linkage with stator windings across the air gap. Fixed magnets may be arranged around a circumference of the rotor. The actuator may be actively or passively driven. Flux-shunting elements are optionally disposed in the rotor to further modify the flux linkage. A gear set connected to torque transfer elements may be driven by the actuator to rotate the rotatable magnets. A vehicle includes drive wheels, a transmission, and the PM machine. A method controls magnetic flux linkage in the PM machine noted above.
    Type: Application
    Filed: January 2, 2018
    Publication date: July 4, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Craig S. Ross, Goro Tamai
  • Patent number: 10160306
    Abstract: A transmission includes an input member, an output member, a first electric device, and a second electric device. A first planetary gear set is coupled to the first electric device. A second planetary gear set is coupled to the second electric device. The output is coupled to both the first planetary gear set and the second planetary gear set. The input is connected to the first planetary gear set. A fixed ratio gear reduction system couples the input and the second planetary gear set. The fixed ratio gear reduction system is operable to transmit rotation from the input to the second planetary gear set at a reduced rotational speed and at an increased torque.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: December 25, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Brendan M. Conlon, Goro Tamai
  • Publication number: 20180072149
    Abstract: A planetary gear assembly for transferring torque in a transmission includes first and second planetary gear sets, each including a ring gear, a sun gear, and a carrier bearing a plurality of planet gears. A bridge portion connects a first carrier of the first planetary gear set to a second ring gear of the second planetary gear set. The bridge portion may be disposed radially outward of the first sun gear, and the bridge portion may be connected to an outer side of the first carrier. In some examples, a first ring bearing assembly is constrained by the first ring gear and the bridge structure; a first carrier bearing assembly is constrained by a first case portion and a bridge extension extending from the first carrier; and a second ring bearing assembly is constrained by a second case portion and a second bridge extension extending from the second ring gear.
    Type: Application
    Filed: September 9, 2016
    Publication date: March 15, 2018
    Inventors: Boris Burgman, Goro Tamai, John A. Diemer
  • Publication number: 20180029460
    Abstract: A transmission includes an input member, an output member, a first electric device, and a second electric device. A first planetary gear set is coupled to the first electric device. A second planetary gear set is coupled to the second electric device. The output is coupled to both the first planetary gear set and the second planetary gear set. The input is connected to the first planetary gear set. A fixed ratio gear reduction system couples the input and the second planetary gear set. The fixed ratio gear reduction system is operable to transmit rotation from the input to the second planetary gear set at a reduced rotational speed and at an increased torque.
    Type: Application
    Filed: August 1, 2016
    Publication date: February 1, 2018
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Brendan M. Conlon, Goro Tamai
  • Patent number: 9863472
    Abstract: A gravity fed bearing lubrication system for distributing lubricant to powertrain components in a motor vehicle, including a lubricant supply, a bearing, and a bearing housing. A three-dimensional cast-in portion of the bearing housing controls the communication of lubricant to the bearing.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: January 9, 2018
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Goro Tamai, Shawn H. Swales
  • Publication number: 20170356498
    Abstract: A gravity fed bearing lubrication system for distributing lubricant to powertrain components in a motor vehicle, including a lubricant supply, a bearing, and a bearing housing. A three-dimensional cast-in portion of the bearing housing controls the communication of lubricant to the bearing.
    Type: Application
    Filed: June 13, 2016
    Publication date: December 14, 2017
    Inventors: Goro Tamai, Shawn H. Swales
  • Patent number: 9810190
    Abstract: A powertrain system is described, and includes an internal combustion engine and an electric machine configured to generate propulsion torque responsive to a driver torque request. A method for operating the powertrain system includes determining, in response to a request to execute an engine autostart operation, whether a driveline torque sag may occur. The method further includes forgoing executing the engine autostart operation when it is determined that a driveline torque sag will occur during the execution of the engine autostart operation.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: November 7, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Meng Wang, Anthony Christman, Poh Fong Chin, John Janczak, Anthony H. Heap, Kee Yong Kim, Bryan J. Morton, Goro Tamai
  • Publication number: 20170282909
    Abstract: A modular rear drive unit for a hybrid vehicle comprises a torque distributing unit, an electric motor-generator, and a gearing arrangement operatively connecting the electric motor-generator with the torque distributing unit. The modular rear drive unit also includes an integrated housing and rear cradle supporting and surrounding the torque distributing unit, the electric motor-generator, and the gearing arrangement. The integrated housing and rear cradle operatively mounts to the vehicle body.
    Type: Application
    Filed: June 16, 2017
    Publication date: October 5, 2017
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Shawn H. Swales, Joel M. Maguire, Goro Tamai, Peter J. Savagian
  • Patent number: 9777798
    Abstract: A system and method for modifying a transmission in a gasoline-electric hybrid vehicle to couple the transmission to an off-axis electric motor. The transmission includes a motor-driven gear that replaces or modifies an engine-driven reverse gear. The motor-driven gear is hard-splined to an output shaft of the transmission. An electric motor is coupled to the output shaft of the transmission via the motor-driven gear. The electric motor may thus be oriented along an axis that differs from the axis of the transmission's output shaft.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: October 3, 2017
    Assignee: FCA US LLC
    Inventors: David E. Klingston, Travis J. Miller, Goro Tamai
  • Patent number: 9707956
    Abstract: A powertrain includes an engine that has a crankshaft. A first motor-generator is drivingly connected to the crankshaft via an endless rotatable device. The powertrain includes a transmission that has a transmission input member driven by the crankshaft and a transmission output member. A front differential is operatively connected with front half shafts. A transfer case is configured to distribute torque of the transmission output member to the front differential and to a driveshaft. A rear differential is configured to transfer torque from the driveshaft to rear half shafts. A second motor-generator is drivingly connected to the rear differential. A gearing arrangement is configured to multiply torque from the second motor-generator to the rear half shafts. A controller controls the second motor-generator to function as a motor that provides torque to the rear wheels through the rear differential. A modular rear drive unit operatively connects to the vehicle body.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: July 18, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Shawn H. Swales, Joel M. Maguire, Goro Tamai, Peter J. Savagian
  • Patent number: 9651101
    Abstract: A method of controlling a selectable one way clutch operable to selectively couple a shaft to a housing of a transmission includes determining if an electric motor is currently operating, and if the selectable one way clutch is currently engaged to couple the shaft to the housing. It is further determined whether or not wheel torque of at least one wheel is currently being actively managed by at least one vehicle control system. When the electric motor is operating with the selectable one way clutch engaged, and wheel torque of at least one wheel of the hybrid vehicle is currently being actively managed by at least one vehicle control system, then selectable one way clutch is disengaged to release the shaft from the housing and allow rotation of the shaft relative to the housing.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: May 16, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Goro Tamai, Anthony J. Corsetti
  • Patent number: 9637197
    Abstract: A number of variations may include a product comprising: an electric cycle powertrain comprising: a motor; at least one gear set operatively connected to the motor; a chain ring operatively connected to the at least one gear set and a chain; a rear sprocket operatively connected to the chain ring and a rear hub; a crank operatively connected to the chain ring and a first pedal assembly and a second pedal assembly; at least one controller and at least one sensor, wherein the at least one controller is constructed and arranged to process one or more signals from the at least one sensor to apply a torque to the motor to compensate for inertial and spin loss associated with the electric cycle powertrain.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: May 2, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Steven L. Hayslett, Goro Tamai
  • Publication number: 20170101000
    Abstract: A powertrain includes an axle end assembly rotatable about a wheel axis. A wheel bearing housing rotatably supports an outer axle end of the axle end assembly. A wheel hub is rotatably supported by the wheel bearing housing for rotation about the wheel axis. A hub actuating system is coupled to the wheel bearing housing, and is selectively controllable between an engaged state for rotatably coupling the wheel hub and the outer axle end together, and a disengaged state for de-coupling the wheel hub and the outer axle end. At least one axle bearing interconnects and rotatably supports the outer axle end relative to the actuator housing so that the outer axle end and the wheel hub are axially stacked relative to each other along the wheel axis, and the wheel hub and the outer axle end do not radially overlap each other relative to the wheel axis.
    Type: Application
    Filed: October 7, 2015
    Publication date: April 13, 2017
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Shawn H. Swales, Goro Tamai