With Preselection Patents (Class 475/272)
  • Patent number: 8597149
    Abstract: A split-axis transmission may include two planetary gear sets to provide two parallel torque paths from an input axis to an output axis. Thus, the split-axis transmission may provide the ratio preselection capability and the low power losses of a dual-clutch transmission, while also providing the ratio-changing control and smoothness of a traditional powershift automatic transmission.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: December 3, 2013
    Assignee: ZF Friedrichshafen AG
    Inventor: James Potter
  • Publication number: 20090048057
    Abstract: A power train of an automatic transmission includes an input shaft connected to a torque converter; an output gear; a transmission case; a first planetary gear set including a first operating member fixedly connected to the input shaft, a second operating member fixedly connected to the transmission case, and a third operating member; a second planetary gear set including a fourth operating member selectively connected to the third operating member, a fifth operating member selectively connected to the input shaft, second or third operating members, a sixth operating member selectively connected to the input shaft or transmission case, a seventh operating member selectively connected to the transmission case, and an eighth operating member acting as an output element, wherein the second planetary gear set outputs ten forward speeds and two reverse speeds; and a plurality of friction members selectively connecting the operating members, input shaft, or transmission case.
    Type: Application
    Filed: December 3, 2007
    Publication date: February 19, 2009
    Inventor: Hyun Seok Choi
  • Publication number: 20080287247
    Abstract: A planetary gear set centering ring for use is a planetary gear train. The planetary gear centering ring is adapted to be positioned within a gear train to center a planetary gear carrier and a set of planetary gears within a ring gear of the gear train.
    Type: Application
    Filed: May 15, 2007
    Publication date: November 20, 2008
    Inventor: Daniel S. Pusateri
  • Patent number: 7276011
    Abstract: An automatic transmission having first and second groups of successive forward-drive positions for outputting a rotary motion a speed of which is higher than the speed of a rotary motion received from an input member, the first group being established by an engaging action of a first input clutch while the second group being established by an engaging action of a second input clutch, or first and second groups of successive forward-drive positions for reducing the speed of the rotary motion received from the input member, the first and second groups being established by an engaging action of a first and second input clutches respectively. The successive operating positions of the first group have respective speed ratios different from those of the second group. The automatic transmission is shiftable to a selected one of the successive operating positions of a selected one of the first and second groups.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: October 2, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Atsushi Tabata, Akira Hoshino, Terufumi Miyazaki, Atsushi Honda, Akiharu Abe, Hirofumi Ota
  • Patent number: 7018319
    Abstract: The invention relates to a multi-step gear, comprising a drive shaft (1) linked with a front-mounted gear train (VS), an output shaft (2) linked with a rear-mounted gear train (NS), and maximally seven shift elements (A, B, C, D, E, D?, A?) through the selective shifting of which at least seven forward gears can be shifted without group shifts. The front-mounted gear train (VS) is formed by a front-mounted planetary gear (VS1) or maximally two non-shiftable front-mounted planetary gears (VS2) coupled with the first front-mounted planetary gear (VS1). The rear-mounted gear train (NS) is configured as a two-stage/four-shaft transmission with two shiftable rear-mounted planetary gears (NS1, NS2) and four free shafts. The first free shaft of said two-stage/four-shaft transmission is linked with the first shift element (A), the second free shaft with the second and third shift elements (B, C), the third free shaft with the fourth and fifth shift element (D, E) and the fourth free shaft with the output shaft (2).
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: March 28, 2006
    Assignee: ZF Friedrichshafen AG
    Inventor: Peter Ziemer
  • Patent number: 6991578
    Abstract: A multi-step gear including a drive shaft linked with a non-shiftable front-mounted gear train, an output shaft linked with a shiftable rear-mounted gear train with four free shafts, and shift elements for selective shifting without group shifts. The first free shaft of the rear gear train is linked with a first shift element, the second free shaft with second and third shift elements, the third free shaft with fourth and fifth shift elements and the fourth free shaft with the output shaft. With six shift elements, the first or third free shaft of the rear-mounted gear is additionally linked with a sixth shift element. With seven shift elements, the third free shaft is additionally linked with a sixth shift element and the first free shaft is additionally linked with a seventh shift element.
    Type: Grant
    Filed: March 27, 2002
    Date of Patent: January 31, 2006
    Assignee: ZF Friedrichshafen AG
    Inventor: Peter Ziemer