Patents by Inventor Shoichi Miyagawa

Shoichi Miyagawa 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: 6269895
    Abstract: In a state a vehicle is stopped at an intersection, an infinitely variable transmission is in a neutral position, a motor/generator rotates with a low speed, an oil pump and an auxiliary equipment are in rotating state. At that time, an input clutch is disengaged, and the internal engine is stopped. When the vehicle is started, a continuously variable transmission performs continuous shift control from the neutral position using hydraulic pressure from an oil pump, and the rotation of the motor/generator is transmitted to drive wheels via a ring gear of a planetary gear. After the vehicle has started driving, the input clutch is engaged and the internal engine is started. The vehicle is driven while the motor/generator assists driving or the motor/generator charges batteries based on operation of the internal engine.
    Type: Grant
    Filed: October 6, 1998
    Date of Patent: August 7, 2001
    Assignee: Aisin AW Co., Ltd.
    Inventors: Takao Tanuguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Shigeo Tsuzuki, Kenji Omote, Seiji Suzuki, Takeshi Hara
  • Patent number: 6146308
    Abstract: In a neutral N control for substantially equalizing axial forces to act on two pulleys, a belt type continuously variable transmission (CVT) self-converges into the gear neutral point (GN) at which the output shaft RPM takes the value 0. When the convergence is made to the GN point to establish a no-load state, the CVT establishes a force F.sub.A to converge into a pulley ratio of 1.0, in which it is stabilized by itself. A converging force F.sub.N to the GN point and the force F.sub.A toward the pulley ratio of 1.0 are repeated in a vortex shape in the load state and in the no-load state to establish a creep force. This creep force can be modified by generating a force F.sub.O against the force F.sub.A.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: November 14, 2000
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Takao Taniguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Shiro Sakakibara, Takeshi Inuzuka, Masashi Hattori, Hirofumi Nozawa
  • Patent number: 5961418
    Abstract: An infinitely variable transmission has a gear neutral (GN) point and serves as an output member by torque circulation. When a pulley ratio thereof is within a predetermined range from the GN point, a coasting state occurs which may hinder smooth torque transmission based on the transmission efficiency and generate a great engine braking effect (failure in the transmission resulting from the coasting state) based on a large gear ratio. When the pulley ratio assumes a predetermined value that may cause failure in transmission resulting from the coasting state, upon release of the accelerator pedal, an electronic throttle system performs control such that the engine outputs a predetermined torque. Thus a positive driving state is always established. In this state, the continuously variable transmission (CVT) is shifted in the upshift direction to escape rapidly from a range defined by the pulley ratio of the predetermined value.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: October 5, 1999
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Takao Taniguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Shiro Sakakibara, Takeshi Inuzuka, Masashi Hattori, Hirofumi Nozawa
  • Patent number: 5876300
    Abstract: A vehicular automatic transmission for establishing a plurality of forward gear stages, includes: a transmission case; an input shaft; a transmission mechanism connected to the input shaft and including a plurality of transmission elements; an output shaft connected to the transmission mechanism; first and second clutches at opposite ends of the transmission mechanism and drivably connecting the input shaft with at least one of the transmission elements; and first and second hydraulic servos for applying the first and second clutches responsive to feed of an oil pressure. The transmission case encloses the transmission mechanism, the clutches and the hydraulic servos, and includes axial end walls forming cylinders for the hydraulic servos.
    Type: Grant
    Filed: June 11, 1997
    Date of Patent: March 2, 1999
    Assignee: Aisin AW Co., Ltd.
    Inventors: Shuzo Moroto, Takao Taniguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Masahiro Hayabuchi, Masaaki Nishida, Satoru Kasuya, Takashi Morimoto, Minoru Todo
  • Patent number: 5846152
    Abstract: A transmission unit includes a belt type continuously variable transmission (CVT) having a first pulley arranged on a first shaft with a stationary sheave, a movable sheave and a hydraulic actuator for the movable sheave. The second pulley of the CVT is mounted on a second shaft and also has a stationary sheave, a movable sheave and a hydraulic actuator. A belt is mounted around the first and second pulleys. The transmission unit further includes a synchronous transmission for connecting a first rotary member arranged on the first shaft and a second rotary member arranged on the second shaft at a constant speed ratio, an output gear for transmitting power to the wheels and a planetary gear unit. The planetary gear unit is mounted on the second shaft and includes at least first, second and third rotary elements. The first rotary element is connected to the second rotary member, the second rotary element to the second pulley, and the third rotary element to the output gear.
    Type: Grant
    Filed: November 22, 1996
    Date of Patent: December 8, 1998
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Takao Taniguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Shiro Sakakibara, Takeshi Inuzuka, Masashi Hattori, Takao Terashima
  • Patent number: 5846155
    Abstract: A vehicular drive unit having a combustion engine, a motor-generator for converting electric energy coming from a battery into mechanical energy to output the converted mechanical energy or for converting mechanical energy into electrical energy to store the converted electrical energy in the battery, and a planetary gear including at least three rotary elements. The vehicular drive unit further includes a continuously variable transmission for changing the revolution of an input member continuously variably to output the changed revolution to the drive wheels of the vehicle. The planetary gear has a first rotary element connected to the output shaft of the combustion engine, a secondary element acting in reaction against the first rotary element and connected to the motor-generator, and a third rotary element connected to the input member of the continuously variable transmission.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: December 8, 1998
    Assignee: Aisin AW Co., Ltd.
    Inventors: Takao Taniguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Shigeo Tsuzuki, Satoru Tanaka, Takeshi Inuzuka, Masashi Hattori, Takeshi Hara
  • Patent number: 5735376
    Abstract: A vehicular automatic transmission, for establishing a plurality of forward gear stages, includes: a transmission case; an input shaft; a transmission mechanism connected to the input shaft and including a plurality of transmission elements; an output shaft connected to the transmission mechanism; a clutch drivably connecting any one of the input shaft and the transmission elements individually; and a hydraulic servo for applying the clutch responsive to an oil pressure. The transmission case encloses the transmission mechanism, the clutch and the hydraulic servo, and includes axial end walls, on one of which is formed a stationary cylinder for the hydraulic servo. A piston is slidably mounted in the cylinder and together with the cylinder, defines an oil chamber for receipt of the actuating oil pressure. A bearing is arranged between the piston and the clutch for transmitting the thrust force from the piston to the clutch, while allowing relative rotation between the piston and the clutch.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: April 7, 1998
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Shuzo Moroto, Takao Taniguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Masahiro Hayabuchi, Masaaki Nishida, Satoru Kasuya, Yutaka Teraoka
  • Patent number: 5690576
    Abstract: A continuously variable transmission system includes a belt type continuously variable transmission unit which, in turn, is composed of a primary pulley and a secondary pulley wherein the torque transmitting direction is switched by torque circulation in changeover between forward and reverse travel. When a low mode is selected in a D range, a somewhat higher hydraulic pressure from a regulator valve is supplied, through a manual valve, to a secondary hydraulic servo, which moves one sheave of the secondary pulley, and a somewhat lower hydraulic pressure from a ratio control valve is supplied to a primary hydraulic servo which moves one sheave of the primary pulley. When the D range is switched to R range by the manual valve, the supplies of the above hydraulic pressures are reversed. With this arrangement, the relative axial forces on the pulleys are changed in switching between forward and reverse travel.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: November 25, 1997
    Assignee: Aisin AW Co., Ltd.
    Inventors: Shuzo Moroto, Takao Taniguchi, Shoichi Miyagawa, Shiro Sakakibara, Kazumasa Tsukamoto, Takeshi Inuzuka, Masashi Hattori
  • Patent number: 5683325
    Abstract: A 5-speed automatic transmission for a vehicle having a highly efficient top gear, a compact construction and a wide overall range of gear ratios. The automatic transmission has a speed changer which provides five gear stages, namely two speeds on the speed decreasing side and two speeds on the speed increasing side with a direct-coupled gear therebetween. The speed changer includes a ring gear connected to an output shaft, a first carrier, a first sun gear, a second carrier connected to the first carrier, a stepped pinion gear supported by these two carriers, and a sun gear meshing with the pinion gear. The first carrier is connected to an input shaft by a clutch and the first sun gear is connected to the input shaft by a clutch. The first sun gear may be stopped by a first brake, a second brake stops the second sun gear and a third brake is provided to stop a third sun gear. Top gear is achieved by meshing of the pinion gear with the second sun gear and the ring gear.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: November 4, 1997
    Assignee: Aisin AW Co., Ltd.
    Inventors: Shuzo Moroto, Takao Taniguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Masahiro Hayabuchi, Masaaki Nishida, Satoru Kasuya, Akitoshi Kato, Nobutada Sugiura
  • Patent number: 5669846
    Abstract: A continuously variable transmission system includes a belt type continuously variable transmission unit (CVT) wherein the direction of torque transmission is switched by torque circulation between a low mode and a high mode accompanied by a change in the axial forces on the pulleys of the CVT. In the Low mode of the D range, a comparatively high hydraulic pressure from a regulator valve is supplied to a Low clutch hydraulic servo via a low-high shifting valve and to a secondary hydraulic servo. In addition, a comparatively low hydraulic pressure from a ratio control valve is supplied to a primary hydraulic servo. These oil pressure feeds are reversed by the switching of the low-high shifting valve.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: September 23, 1997
    Assignee: Aisin AW Co., Ltd.
    Inventors: Shuzo Moroto, Takao Taniguchi, Shoichi Miyagawa, Shiro Sakakibara, Kazumasa Tsukamoto, Takeshi Inuzuka, Masashi Hattori
  • Patent number: 5662547
    Abstract: A belt type continuously variable transmission (CVT) and a planetary gear unit are combined in a continuously variable transmission system for an automobile to deliver an output from the output shaft in the normal and reverse directions with a neutral position therebetween. A control mechanism with a hydraulic circuit controls hydraulic pressure of primary and secondary hydraulic servos for controlling axial forces applied to respective primary and secondary pulleys of the belt type continuously variable transmission. When an axial force difference is produced between the primary pulley and the secondary pulley, the belt type continuously variable transmission changes its speed corresponding to a torque transmission direction and normal and reverse rotation directions.
    Type: Grant
    Filed: March 25, 1996
    Date of Patent: September 2, 1997
    Assignee: Aisin AW Co., Ltd.
    Inventors: Shuzo Moroto, Takao Taniguchi, Shoichi Miyagawa, Shiro Sakakibara, Kazumasa Tsukamoto, Takeshi Inuzuka, Masashi Hattori