Patent ID: 9689440
Date: 2017-06-27
CPC Classifications: B60W,F16D,F16H

Claim:
1. A power transfer device that includes a continuously variable transmission and an oil pump, the continuously variable transmission including a first pulley provided on a driving rotary shaft coupled to a motor of a vehicle and having a groove with a changeable groove width, a second pulley provided on a driven rotary shaft coupled to axles of the vehicle and having a groove with a changeable groove width, a belt that extends between the first and second pulleys, a first hydraulic actuator that changes the groove width of the first pulley, and a second hydraulic actuator that changes the groove width of the second pulley, and the oil pump generating a hydraulic pressure to be supplied to the first and second hydraulic actuators, comprising: a hydraulic clutch that couples and decouples the driven rotary shaft of the continuously variable transmission and the axles to and from each other, wherein: the second pulley of the continuously variable transmission includes a movable sheave movably supported by the driven rotary shaft, and a piston that rotates together with the driven rotary shaft and that constitutes the second hydraulic actuator together with the movable sheave; the piston of the second hydraulic actuator is used to define an engagement oil chamber of the hydraulic clutch; the piston of the second hydraulic actuator is fitted with the driven rotary shaft and is coupled to a clutch hub of the hydraulic clutch by supplying a hydraulic pressure to the engagement oil chamber such that torque is transferred from the driven rotary shaft to the clutch hub via the piston, and the clutch huh is supported by a drive gear into which the driven rotary shaft is rotatably inserted and is coupled to the axles through the drive gear; and friction plates of the hydraulic clutch are supported by the piston of the second hydraulic actuator.