U-shaped spline hub bearing and driving shaft connecting structure

The invention provides a U-shaped spline hub bearing and driving shaft connecting structure, which comprises a shaft wheel, a sealing ring and a spline sleeve. The shaft wheel comprises an outer wheel, a steel ball, a retainer, an inner wheel and a sealing ring, the small end of the shaft wheel fixes the inner wheel through spin riveting, U-shaped splines formed by connecting an inner hole, an end face and an outer circle into a whole are machined at the spin riveting end of the shaft wheel, and each key is in taper-shaped smooth transition at the joint of the end face, the outer circle and the inner hole. The spline shell is sleeved on the end portion of the U-shaped spline of the shaft wheel, a U-shaped ring groove is arranged on the end face of the spline shell, U-shaped spline teeth which are connected into a whole are arranged on the inner diameter face, the groove bottom face and the outer diameter face of the ring groove, and the spline teeth are connected with the U-shaped spline on the end portion of