A chainsaw includes a sprocket coupled to a chain and configured to drive the chain, wherein the sprocket comprises a receiving area defining a drive surface; a clutch disposed at least partially in the receiving area of the sprocket, wherein the clutch comprises: a hub defining a central axis, the hub being rotationally keyed to an output shaft of a motor; a centrifugal weight disposed between the hub and the sprocket and movable in a radial direction relative to the central axis; and a spring compressed between the hub and the centrifugal weight to bias the centrifugal weight in a radial direction towards the central axis; wherein the centrifugal weight comprises a drive feature on a radially outer surface, and wherein the drive feature is configured to selectively interface with the drive surface of the sprocket when the output shaft is rotating above a threshold rotational speed.

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.