Patent ID: 7064464

Claim:
Electromechanical linear drive for an injection molding machine, the drive comprising: a motor housing containing a stator; a hollow cylindrical rotor received concentrically in the stator to form an electric motor having a magnet gap between the rotor and the stator, the rotor having an open end, a closed end, and a central bearing journal extending axially outward from the closed end; a helical gear connected to the rotor for converting rotational movement of the rotor to linear movement; two axially pretensioned individual bearings supporting the journal for rotation in the housing, the two bearings being spaced apart axially and absorbing both longitudinal and transverse forces in opposite directions, the two bearings providing the sole support for the rotor with respect to the stator when the rotor is concentric to the stator; and an anti-contact device located at open end of the rotor for preventing contact between the rotor and the stator in the event of eccentric deflection of the rotor with respect to the stator.