Patent ID: 7235904

Claim:
A drive system for connection to a drive shaft which is rotatable about an axis, the drive system comprising: an electric machine comprising a stator and a rotor which can be fixed to the drive shaft so that the rotor has an axis of rotation which is coaxial with the axis of the drive shaft; first teeth fixed to the rotor and extending parallel to the axis of rotation; a housing of a clutch device; second teeth fixed to the housing and engaging the first teeth so that the housing and rotor are in rotational driving engagement with one another; a catch member fixed to one of said rotor and said housing, said catch member being formed of sheet metal and having at least one radially resilient catch projection; and at least one catch recess fixed to the other of said rotor and said housing, said catch projection resiliently engaging in said catch recess to axially secure said housing to said rotor.