Trailer drive mechanism

The utility model discloses a trailer drive mechanism, including pulling the seat and all being located hook lock, lever, control rod, wedge, control rod spring and the towing pin subassembly that pulls foot stall portion, the hook lock is with to pull the seat each other articulated to steerable hook lock is rotatable to be resetd, among the foretell trailer drive mechanism, the towing pin subassembly includes screw, nut and bolt, the screw pass behind lever and the control rod with the nut spiro union, the axial terminal surface of nut is provided with a plurality of breach, the screw includes a radial through -hole, bolt plug is in the through -hole, and its both ends are located the breach. The utility model discloses a trailer drive mechanism can avoid the bolt to drop and the potential safety hazard that causes.