Gear shifting buffer structure and gearbox thereof

The utility model relates to a gear shifting buffer structure and a gearbox thereof, and belongs to the technical field of gearboxes, the gear shifting buffer structure comprises a shifting fork shaft, a neutral position groove and self-locking grooves are formed in the shifting fork shaft, the self-locking grooves are located in the two sides of the neutral position groove and distributed in the axial direction of the shifting fork shaft, the neutral position groove is of an inverted trapezoidal structure, and the self-locking grooves are matched with the neutral position groove. The neutral position groove is provided with a guide slope extending to a groove opening of the self-locking groove. The guide slopes on the two sides of the neutral gear groove are connected with the side walls of the self-locking grooves in the two sides, in the shifting fork shaft moving and gear shifting process, the guide slopes are subjected to resistance brought by an extrusion piece, gear shifting buffering is conducted on t