Speed change mechanism of vehicle

The utility model provides a speed change mechanism of a vehicle, which is suitable for being connected with a main shaft used for providing power and comprises a rotating shaft suitable for being coaxially connected with the main shaft, a clutch in modular connection with the rotating shaft and a pushing pin used for pushing and abutting against the clutch. The rotating shaft comprises a shaft body and a slotted hole, wherein the shaft body defines a shaft channel extending in the axial direction, and the slotted hole penetrates through the shaft body in the radial direction. The clutch comprises a center body sleeved on the rotating shaft, and the push pin is arranged in the slotted hole in a penetrating mode. By means of the modular design of the rotating shaft and the clutch, assembly of the rotating shaft and the clutch can be directly completed in a single step, the assembly operation is greatly simplified, the rotating shaft can be directly and coaxially connected with the main shaft, and therefore the