×

Driving force transmission apparatus

  • US 7,314,427 B2
  • Filed: 07/13/2005
  • Issued: 01/01/2008
  • Est. Priority Date: 07/16/2004
  • Status: Expired due to Fees
First Claim
Patent Images

1. A driving force transmission apparatus comprising:

  • a first input shaft having a plurality of first gears;

    a second input shaft having a plurality of second gears;

    a first clutch configured and arranged to operatively transmit an engine driving force of an engine to the first input shaft;

    a second clutch configured and arranged to operatively transmit the engine driving force of the engine to the second input shaft;

    a countershaft having a plurality of third gears with the countershaft being disposed in parallel with the first and second input shafts such that the third gears are engaged with the first and second gears to selectively transmit the engine driving force from the first and second input shafts to the countershaft through first and second gear sets, the first gear sets being established by connection of one of the first and third gears together, the second gear sets being established by connection of one of the second and third gears together, one of the first, second and third gears in each of the first and second gear sets being rotatably mounted on a corresponding one of the first and second input shafts and the countershaft, and one of the first, second and third gears in each of the first and second gear sets being non-rotatably mounted on a corresponding one of the first and second input shafts and the countershaft;

    a gear engagement device configured and arranged to selectively fix of one of the first, second and third gears that are rotatably mounted to the corresponding one of the first and second input shafts and the countershaft; and

    a transmission control unit configured to selectively operate the first and second clutches and the gear engagement device when a predetermined engine operating condition is determined to selectively establish one ofa first drive transmission path transmitting the engine driving force from the first clutch via the first input shaft through one of the first gear sets and the countershaft to a driving wheel, anda second drive transmission path transmitting the engine driving force from the second clutch via the second input shaft through the one of the second gear sets and the countershaft to the driving wheel; and

    the transmission control unit being further configured to perform a gear shift operation that switches from a current drive transmission path of one of the first and second drive transmission paths to a next drive transmission path of one of the first and second drive transmission paths such that one of each of the first and second gear sets are both engaged for a period of time prior to the gear shift operation with a slip engagement occurring in the one of the first and second clutches that is disposed in the next drive transmission path prior to the period of time in which one of each of the first and second gear sets are engaged.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×