Patents by Inventor Takeo Hiramatsu

Takeo Hiramatsu 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: 8439794
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; an input shaft; an output shaft; and five friction elements. A first ring gear is constantly locked. A third carrier is connected with a second ring gear to define a rotating member. The input shaft is constantly connected with a second carrier, and the output shaft is constantly connected with the rotating member. The five friction elements are adapted to selectively connect among the carriers, ring gears and sun gears. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by an engaged state of two friction elements selected from the five friction elements.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: May 14, 2013
    Assignee: Jatco Ltd
    Inventor: Takeo Hiramatsu
  • Patent number: 8303452
    Abstract: An automatic transmission includes a first planetary gear set including first to third rotating elements; a second planetary gear set including fourth to sixth rotating elements; a third planetary gear set including seventh to sixth to ninth rotating elements; an input shaft constantly connected with the first rotating element; an output shaft constantly connected with the second rotating element; and at least five friction elements including a first friction element capable of locking a rotation of the eighth rotating element, a second friction element configured to selectively connect the second rotating element with the fifth rotating element, a third friction element configured to selectively connect the second rotating element with a second rotating member defined by the sixth and seventh rotating elements, a fourth friction element configured to selectively connect the fifth rotating element with the eighth rotating element, and a fifth friction element configured to selectively connect the first rotati
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: November 6, 2012
    Assignee: Jatco Ltd
    Inventors: Kazuaki Aota, Takashi Fujioka, Naoki Kobayashi, Kazuo Oguri, Takeo Hiramatsu
  • Publication number: 20120277053
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; an input shaft; an output shaft; and five friction elements. A first ring gear is constantly locked. A third carrier is connected with a second ring gear to define a rotating member. The input shaft is constantly connected with a second carrier, and the output shaft is constantly connected with the rotating member. The five friction elements are adapted to selectively connect among the carriers, ring gears and sun gears. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by an engaged state of two friction elements selected from the five friction elements.
    Type: Application
    Filed: May 21, 2012
    Publication date: November 1, 2012
    Inventor: Takeo HIRAMATSU
  • Patent number: 8202193
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; an input shaft; an output shaft; and five friction elements. A first ring gear is constantly locked. A third carrier is connected with a second ring gear to define a rotating member. The input shaft is constantly connected with a second carrier, and the output shaft is constantly connected with the rotating member. The five friction elements include a first friction element adapted to selectively connect a first carrier with a third ring gear; a second friction element adapted to selectively connect a first sun gear with the second carrier; a third friction element adapted to selectively connect the first sun gear with a second sun gear; a fourth friction element adapted to selectively connect the first carrier with the second carrier; and a fifth friction element adapted to selectively connect the first carrier with the second sun gear.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: June 19, 2012
    Assignee: JATCO Ltd
    Inventor: Takeo Hiramatsu
  • Patent number: 8197381
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; an input shaft; an output shaft; and five friction elements. The five friction elements include a first friction element adapted to selectively connect a first ring gear with a second carrier, a second friction element adapted to selectively connect the first ring gear with the second rotating member, a third friction element adapted to selectively connect the second carrier with a third ring gear, a fourth friction element adapted to selectively stop a rotation of the third ring gear, and a fifth friction element adapted to selectively connect the first sun gear with the second carrier. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by an engaged state of two friction elements selected from the five friction elements.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: June 12, 2012
    Assignee: Jatco Ltd
    Inventor: Takeo Hiramatsu
  • Patent number: 8007399
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; an input shaft; an output shaft; and five friction elements. A first ring gear is constantly locked. A third sun gear is connected with a first sun gear to define a first rotating member, and a second sun gear is connected with a first carrier to define a second rotating member. The input shaft is constantly connected with the first rotating member, and the output shaft is constantly connected with a third carrier.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: August 30, 2011
    Assignee: JATCO Ltd
    Inventor: Takeo Hiramatsu
  • Patent number: 7935018
    Abstract: An automatic transmission is provided with three planetary gear units and five friction elements that establish at least six forward speeds and one reverse speed by engaging different combinations of three out of five friction elements simultaneously. In the automatic transmission, an output shaft is always connected to a first ring gear of the first planetary gear unit. A second ring gear of the second planetary gear unit is always fixed. A first carrier of the first planetary gear unit and a third ring gear of the third planetary gear unit are connected together to form a first rotating member. A second sun gear of the second planetary gear unit and a third carrier of the third planetary gear unit are connected together to form a second rotating member.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: May 3, 2011
    Assignee: Jatco Ltd
    Inventor: Takeo Hiramatsu
  • Patent number: 7914415
    Abstract: An automatic transmission is provided with three planetary gear units and five friction elements. The first planetary gear unit includes a first sun gear that is always fixed, a first carrier supporting a first pinion in meshed engagement with the first sun gear and a first ring gear in meshed engagement with the first pinion. The first to fifth friction elements are operatively arranged with respect to the first, second and third planetary gear units to selectively establish at least seven forward speeds and one reverse speed by combining simultaneous engagement of two out of five friction elements for transmitting torque from the input shaft to the output shaft.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: March 29, 2011
    Assignee: Jatco Ltd
    Inventor: Takeo Hiramatsu
  • Patent number: 7909724
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; and at least five friction elements. The at least five friction elements includes a first clutch adapted to selectively connect a first carrier with a second carrier; a first brake adapted to selectively stop a rotation of the second carrier; a second brake adapted to selectively stop a rotation of a rotating member having a first sun gear, a second ring gear, and a third carrier; a third brake adapted to selectively stop a rotation of a third sun gear; and a second clutch adapted to selectively connect the first carrier with a second sun gear. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by engaging two friction elements selected from the first and second clutches and the first to third brakes.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: March 22, 2011
    Assignee: Jatco Ltd
    Inventor: Takeo Hiramatsu
  • Patent number: 7909725
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; and at least five friction elements. The at least five friction elements includes a first clutch adapted to selectively connect a first carrier with a second carrier; a first brake adapted to selectively stop a rotation of the second carrier; a second brake adapted to selectively stop a rotation of a rotating member having a first sun gear, a second ring gear, and a third carrier; a third brake adapted to selectively stop a rotation of a third sun gear; and a second clutch adapted to selectively connect the first carrier with a second sun gear. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by engaging two friction elements selected from the first and second clutches and the first to third brakes.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: March 22, 2011
    Assignee: Jatco Ltd
    Inventor: Takeo Hiramatsu
  • Publication number: 20110028263
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; and at least five friction elements. The at least five friction elements includes a first clutch adapted to selectively connect a first carrier with a second carrier; a first brake adapted to selectively stop a rotation of the second carrier; a second brake adapted to selectively stop a rotation of a rotating member having a first sun gear, a second ring gear, and a third carrier; a third brake adapted to selectively stop a rotation of a third sun gear; and a second clutch adapted to selectively connect the first carrier with a second sun gear. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by engaging two friction elements selected from the first and second clutches and the first to third brakes.
    Type: Application
    Filed: October 12, 2010
    Publication date: February 3, 2011
    Inventor: Takeo HIRAMATSU
  • Publication number: 20110028264
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; and at least five friction elements. The at least five friction elements includes a first clutch adapted to selectively connect a first carrier with a second carrier; a first brake adapted to selectively stop a rotation of the second carrier; a second brake adapted to selectively stop a rotation of a rotating member having a first sun gear, a second ring gear, and a third carrier; a third brake adapted to selectively stop a rotation of a third sun gear; and a second clutch adapted to selectively connect the first carrier with a second sun gear. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by engaging two friction elements selected from the first and second clutches and the first to third brakes.
    Type: Application
    Filed: October 12, 2010
    Publication date: February 3, 2011
    Inventor: Takeo HIRAMATSU
  • Publication number: 20100311536
    Abstract: An automatic transmission includes a first planetary gear set including first to third rotating elements; a second planetary gear set including fourth to sixth rotating elements; a third planetary gear set including seventh to sixth to ninth rotating elements; an input shaft constantly connected with the first rotating element; an output shaft constantly connected with the second rotating element; and at least five friction elements including a first friction element capable of locking a rotation of the eighth rotating element, a second friction element configured to selectively connect the second rotating element with the fifth rotating element, a third friction element configured to selectively connect the second rotating element with a second rotating member defined by the sixth and seventh rotating elements, a fourth friction element configured to selectively connect the fifth rotating element with the eighth rotating element, and a fifth friction element configured to selectively connect the first rotati
    Type: Application
    Filed: November 14, 2008
    Publication date: December 9, 2010
    Inventors: Kazuaki Aota, Takashi Fujioka, Naoki Kobayashi, Kazuo Oguri, Takeo Hiramatsu
  • Patent number: 7833123
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; and at least five friction elements. The at least five friction elements includes a first clutch adapted to selectively connect a first carrier with a second carrier; a first brake adapted to selectively stop a rotation of the second carrier; a second brake adapted to selectively stop a rotation of a rotating member having a first sun gear, a second ring gear, and a third carrier; a third brake adapted to selectively stop a rotation of a third sun gear; and a second clutch adapted to selectively connect the first carrier with a second sun gear. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by engaging two friction elements selected from the first and second clutches and the first to third brakes.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: November 16, 2010
    Assignee: JATCO Ltd
    Inventor: Takeo Hiramatsu
  • Patent number: 7677997
    Abstract: A double piston and belt type continuously variable transmission comprises a primary pulley provided with a primary piston chamber and a primary clamp chamber; a secondary pulley provided with a secondary piston chamber and a secondary clamp chamber; and an endless belt operatively put around the primary and secondary pulleys. A switching circuit is arranged to connect both the primary and secondary clamp chambers to either one of the primary and secondary piston chambers, which shows a higher hydraulic pressure than the other.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: March 16, 2010
    Assignee: JATCO Ltd
    Inventors: Takeo Hiramatsu, Yoshihiro Kono, Seiichiro Takahashi, Jonggap Kim, Yasushi Yabe
  • Publication number: 20090221395
    Abstract: An automatic transmission is provided with three planetary gear units and five friction elements that establish at least six forward speeds and one reverse speed by engaging different combinations of three out of five friction elements simultaneously. In the automatic transmission, an output shaft is always connected to a first ring gear of the first planetary gear unit. A second ring gear of the second planetary gear unit is always fixed. A first carrier of the first planetary gear unit and a third ring gear of the third planetary gear unit are connected together to form a first rotating member. A second sun gear of the second planetary gear unit and a third carrier of the third planetary gear unit are connected together to form a second rotating member.
    Type: Application
    Filed: January 13, 2009
    Publication date: September 3, 2009
    Applicant: JATCO LTD
    Inventor: Takeo HIRAMATSU
  • Publication number: 20090143184
    Abstract: An automatic transmission is provided with three planetary gear units and five friction elements. The first planetary gear unit includes a first sun gear that is always fixed, a first carrier supporting a first pinion in meshed engagement with the first sun gear and a first ring gear in meshed engagement with the first pinion. The first to fifth friction elements are operatively arranged with respect to the first, second and third planetary gear units to selectively establish at least seven forward speeds and one reverse speed by combining simultaneous engagement of two out of five friction elements for transmitting torque from the input shaft to the output shaft.
    Type: Application
    Filed: November 11, 2008
    Publication date: June 4, 2009
    Applicant: JATCO LTD
    Inventor: Takeo HIRAMATSU
  • Publication number: 20090143187
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; an input shaft; an output shaft; and five friction elements. A first ring gear is constantly locked. A third carrier is connected with a second ring gear to define a rotating member. The input shaft is constantly connected with a second carrier, and the output shaft is constantly connected with the rotating member. The five friction elements include a first friction element adapted to selectively connect a first carrier with a third ring gear; a second friction element adapted to selectively connect a first sun gear with the second carrier; a third friction element adapted to selectively connect the first sun gear with a second sun gear; a fourth friction element adapted to selectively connect the first carrier with the second carrier; and a fifth friction element adapted to selectively connect the first carrier with the second sun gear.
    Type: Application
    Filed: November 14, 2008
    Publication date: June 4, 2009
    Inventor: Takeo HIRAMATSU
  • Publication number: 20090143186
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; an input shaft; an output shaft; and five friction elements. A first ring gear is constantly locked. A third sun gear is connected with a first sun gear to define a first rotating member, and a second sun gear is connected with a first carrier to define a second rotating member. The input shaft is constantly connected with the first rotating member, and the output shaft is constantly connected with a third carrier.
    Type: Application
    Filed: November 14, 2008
    Publication date: June 4, 2009
    Inventor: Takeo HIRAMATSU
  • Publication number: 20090143185
    Abstract: An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; an input shaft; an output shaft; and five friction elements. A second ring gear is constantly locked. A first carrier is connected with a third carrier to define a first rotating member, and a second sun gear is connected with a third sun gear to define a second rotating member. The input shaft is constantly connected with a first sun gear, and the output shaft is constantly connected with the first rotating member.
    Type: Application
    Filed: November 14, 2008
    Publication date: June 4, 2009
    Inventor: Takeo HIRAMATSU