US 2015/0087452 A1 · POWER TRANSMISSION UNIT FOR VEHICLE

Abstract

A power transmission unit for a vehicle is provided. In the power transmission unit, a continuously variable transmission to alter a speed ratio continuously is disposed between an input shaft to which a torque of a prime mover is inputted and an output shaft rotated by the torque transmitted from the input shaft. A first gear train that transmits the torque to propel the vehicle in the forward direction is arranged parallel to a second gear train that transmits the torque to propelling the vehicle backwardly. The power transmission unit is comprised of: a first clutch device that selectively allows a torque transmitting route from the input shaft to the output shaft via the first gear train to transmit the torque therethrough; a dog clutch that switches the torque transmitting route from the input shaft to the output shaft between a continuously variable speed change route in which the torque is transmitted through the continuously variable transmission and a reverse route in which the torque is transmitted through the second gear train; and a second clutch device that connects and disconnects both of the continuously variable speed change route and the reverse route to/from at least any one of the input shaft and the output shaft.

Claims11

Dependent claims

A power transmission unit for a vehicle, comprising:
a continuously variable transmission that is adapted to alter a speed ratio continuously, and that is disposed between an input shaft to which a torque of a prime mover is inputted and an output shaft that outputs the torque;
a first gear train that transmits the torque when propelling the vehicle in the forward direction;
and
a second gear train that transmits the torque to propel the vehicle backwardly by rotating the output shaft in an opposite direction to a rotational direction of the input shaft when propelling the vehicle in the backward direction and that is arranged parallel to the first gear train;
a first clutch device that selectively allows a torque transmitting route from the input shaft to the output shaft via the first gear train to transmit the torque therethrough;
a dog clutch that switches the torque transmitting route from the input shaft to the output shaft between a continuously variable speed change route in which the torque is transmitted through the continuously variable transmission and a reverse route in which the torque is transmitted through the second gear train;
a second clutch device that selectively enables and disables both of the continuously variable speed change route and the reverse route to transmit the torque to the input shaft or the output shaft;
and
a counter gear pair that is disposed at a site to transmit the torque of the input shaft to the continuously variable transmission route and to the reverse route, and that is involved in a torque transmission between the input shaft and the continuously variable transmission route and a torque transmission between the input shaft and the reverse route.

7 more elements

Dependencies are inferred from the claim text.

Power transmission unit for vehicle

Life of this patent

Power transmission unit for vehicle

Life of this patent

Abstract

Claims11