Patent ID: 7642679

Claim:
A drive unit ( 2 ) for a hand-held power tool, comprising: a housing ( 6 ); a stator ( 8 ) located in the housing ( 6 ) and having a longitudinal axial extent (L) between two opposite ends ( 10 ) of the stator ( 8 ); an end member ( 12 ) provided at each of the opposite ends ( 10 ) of the stator ( 8 ); a rotor ( 14 ) provided with at least one permanent magnet ( 16 ), arranged in a receiving space ( 20 ) limited by the stator ( 8 ) and the end members ( 12 ), and the rotatably supported by a drive axle ( 18 ) on the end members ( 12 ); and a fan ( 22 ) rotatably connected with the drive axle ( 18 ) for generating a cooling flow (K) from one stator end ( 10 ) to another stator end ( 10 ) between an inner surface ( 26 ) of the drive unit housing ( 6 ) and an outer surface ( 28 ) of the stator ( 8 ) for cooling the stator ( 8 ) and the drive unit, the stator outer surface ( 28 ) being provided with a plurality of deflection surfaces ( 32 ) extending transverse to the longitudinal extent (L) of the stator ( 8 ) for increasing a cooling effect of the cooling flow (K).