Abstract: A forming mold for a drum-shaped shaft tube and a demolding method therefor are provided. The forming mold includes a rotating body having a through hole that passes through the center of the body in an axial direction. The body is divided into multiple parts in a longitudinal direction. The parts are combined in a circumferential direction to form the rotating body. A longitudinal maximum material size of each part is less than a minimum diameter of the through hole. Two side edges of a cross section of at least one part are deflected toward adjacent parts with respect to radial lines at which two end points of an outer arc of the cross section are located, and a chord length of the outer arc of the cross section is less than a chord length of an inner arc of the cross section. The body has a forming section.

Abstract: A shaft tube joint structure of a drive shaft is disclosed. The structure includes an extension tube, a shaft tube, a convex tube, a concave tube, an inner adhesive rubber ring and an outer adhesive rubber ring; the extension tube and the shaft tube are abutted to each other; the convex tube is sleeved in the extension tube and the shaft tube at the abutting position therebetween, an inner seam having a variable gap size distribution is formed in an axis direction; the concave tube is sleeved on the extension tube and the shaft tube at the abutting position therebetween, an outer seam having a variable gap size distribution is formed in the axis direction. The inner adhesive rubber ring and the outer adhesive rubber ring are fully used for simultaneously transmitting a power torque, thus improving the power torque bearing capability of the shaft tube joint structure.

Abstract: The present disclosure relates to a shaft tube joint structure of a drive shaft, including an extension tube, a shaft tube, a convex tube, a concave tube, an inner adhesive rubber ring and an outer adhesive rubber ring; the extension tube and the shaft tube are abutted to each other; the convex tube is sleeved in the extension tube and the shaft tube at the abutting position therebetween, an inner seam having a variable gap size distribution is formed in an axis direction; the concave tube is sleeved on the extension tube and the shaft tube at the abutting position therebetween, an outer seam having a variable gap size distribution is formed in the axis direction. The inner adhesive rubber ring and the outer adhesive rubber ring are fully used for simultaneously transmitting a power torque, thus improving the power torque bearing capability of the shaft tube joint structure.