| 摘要 |
The invention concerns a gear motor ( 1 ), in particular for driving vehicle equipment, comprising a rotor provided with a rotor shaft ( 6 ), a reduction gearbox housing ( 14 ) containing a cog wheel engaged in an endless screw of the shaft and capable of driving an output member ( 12 ). The invention is characterised in that it comprises means ( 12 ) for eliminating, under predetermined axial compression (F), all axial play between one end ( 6 a) of the rotor shaft and the housing wall ( 13 ). Said means can comprise a plug ( 15 ) housed in the housing ( 14 ) end ( 13 ) and a piston ( 18 ), inserted between the plug ( 15 ) and the shaft ( 6 ) end ( 6 a); the plug ( 15 ) exerts on the piston ( 18 ) and the shaft ( 6 ) the axial thrust ( 7 ) which is adjusted when being mounted, and is axially locked in the corresponding position by melting the housing ( 14 ) plastic material in the grooves or recesses ( 19 ) of the piston ( 18 ) surface, then in solidifying said plastic material. The suppression of axial play in the rotor shaft ( 6 ) eliminates all the disturbing noises caused by changes in rotational direction. |
