The clutch connects/disconnects the motor and gearbox, along with the gearbox variations rotating speed through diverse gears. It divides the Puppy clutch into a synchronizer hub and shift sleeve(pinion). Synchronizer hub can be a gear connected into the generate shaft though the collar with sliding capacity all over it's shift https://gearbox86429.myparisblog.com/34208896/what-does-gearbox-mean