Vehicle generator rotor shaft mounting structure

The utility model relates to the field of engines, and discloses a vehicle engine rotor shaft mounting structure, which comprises a front claw pole and a rear claw pole which are provided with concentric holes and are arranged in a relatively crossed manner, and a rotor shaft which penetrates through the two concentric holes in an interference manner, and an anti-deformation structure which can reduce the deformation quantity when the rotor shaft is pressed into the concentric holes is arranged on the rotor shaft. The grooves are formed in the rotor shaft in the circumferential direction at intervals and can reduce the contact area with the concentric hole, the press-in shaft section is arranged at the end, away from the press-in end, of the rotor shaft in a protruding mode, the outer diameter of the press-in shaft section is larger than that of the concentric hole, and a fixing structure for limiting the front claw pole is arranged between the end, close to the press-in end, of the rotor shaft and the front