Patent ID: 8823228

Claim:
A transmission drive unit ( 10 ), comprising: a drive motor ( 12 ); and a transmission ( 14 ) which is driven by the drive motor, the transmission ( 14 ) having an output element ( 70 ) and a self-locking device ( 60 ) with a locking element ( 62 , 55 ), and the locking element ( 62 , 55 ) locking the transmission ( 12 ) for torques which are introduced into the transmission ( 12 ) by the output element ( 70 ), characterized in that the transmission ( 12 ) is configured with transmission toothing ( 47 ) and a motor shaft bearing ( 32 , 28 ) in a manner which is optimized with respect to the degree of efficiency with minimum friction, and the drive motor ( 12 ) has, as an exciter magnet, a sleeve-shaped toric magnet ( 18 ) which is arranged in a pole pot ( 16 ) which forms a magnetic yoke, characterized in that a drive shaft ( 22 ) is mounted in the pole pot ( 16 ) by means of a sliding bearing ( 28 ), which is mounted in the transmission housing ( 36 ) by means of a ball bearing ( 32 ), and characterized in that the ball bearing ( 32 ) is positioned approximately in a central region of the drive shaft ( 22 ), and the drive shaft ( 22 ) is supported in the transmission housing ( 36 ) and in the pole pot ( 16 ) only in an axial direction ( 23 ) as a fixed bearing formed by the ball bearing ( 32 ).