Novel main shaft structure of direct-drive gear hobbing machine

The utility model provides a novel direct drive gear hobbing machine main shaft structure which comprises a main shaft assembly, a hob mechanism and a tailstock mechanism which are installed on a hob main shaft base, a motor stator and a motor rotor are coaxially installed on a main shaft, and the two ends of the motor stator and the two ends of the motor rotor are supported through a first bearing seat assembly and a second bearing seat assembly respectively. The hobbing cutter mechanism comprises a hobbing cutter arranged on a cutter bar in a sleeving mode, one end of the pull rod penetrates through a hollow cavity formed in the main shaft in the axial direction of the main shaft and then is connected with one end of the cutter bar, the other end of the pull rod is connected with the piston mechanism, and the other end of the cutter bar is connected with the tailstock mechanism. The in-place detection mechanism comprises an induction ring on the piston mechanism and a plurality of proximity switches and is