During movement of a mass of a centrifugal clutch a radially inner position to a radially outer position and a resulting increase in torque transmitted from an input gear to an output shaft, a power transmission apparatus includes a first torque region where the apparatus restricts operation of a pressing assist cam and a second torque region where the apparatus allows operation of the pressing assist cam.

During movement of a mass of a centrifugal clutch a radially inner position to a radially outer position and a resulting increase in torque transmitted from an input gear to an output shaft, a power transmission apparatus includes a first torque region where the apparatus restricts operation of a pressing assist cam and a second torque region where the apparatus allows operation of the pressing assist cam.

During movement of a mass of a centrifugal clutch a radially inner position to a radially outer position and a resulting increase in torque transmitted from an input gear to an output shaft, a power transmission apparatus includes a first torque region where the apparatus restricts operation of a pressing assist cam and a second torque region where the apparatus allows operation of the pressing assist cam.

A transmission system for a hybrid drive unit is provided herein. The transmission system includes a centrifugal clutch that is connected to a driven shaft and that is connectable to an electric machine, as well as a clutch slider element that is connected to a rotor of the electric machine and that is slidable relative to the centrifugal clutch between three engagement positions. In one of the position the transmission system is operable in either an electric-only drive mode (electric machine drives the driven shaft while the centrifugal clutch is disengaged), or at least one hybrid drive mode (engine and electric machine drive the driven shaft). The transmission system also includes a clutch override assembly for rotatably coupling the centrifugal clutch and clutch slider element to provide continuous torque transmission to the driven shaft when switching between the electric-only drive mode and the at least one hybrid drive mode.

A transmission system for a hybrid drive unit is provided herein. The transmission system includes a centrifugal clutch that is connected to a driven shaft and that is connectable to an electric machine, as well as a clutch slider element that is connected to a rotor of the electric machine and that is slidable relative to the centrifugal clutch between three engagement positions. In one of the position the transmission system is operable in either an electric-only drive mode (electric machine drives the driven shaft while the centrifugal clutch is disengaged), or at least one hybrid drive mode (engine and electric machine drive the driven shaft). The transmission system also includes a clutch override assembly for rotatably coupling the centrifugal clutch and clutch slider element to provide continuous torque transmission to the driven shaft when switching between the electric-only drive mode and the at least one hybrid drive mode.