Vibration damping bushing and manufacturing method of vibration damping bushing

A manufacturing method of a vibration damping bushing wherein an outer cylindrical member is arranged on an outer peripheral side of an inner axial member, and the inner axial member and the outer cylindrical member are connected in a radial direction by a main rubber elastic body, the method comprising:

• providing the outer cylindrical member on its both axial sides with a pair of first inclined cylindrical parts each having a diameter gradually reduced toward an axial outside and a pair of second inclined cylindrical parts each extending further toward the axial outside from an axial end of the corresponding first inclined cylindrical part with an inclination angle smaller than that of the first inclined cylindrical part;
• arranging the outer cylindrical member on the outer peripheral side of the inner axial member and connecting the outer cylindrical member and the inner axial member via the main rubber elastic body;
• and then
• deforming axial ends of the main rubber elastic body by deforming the second inclined cylindrical parts of the outer cylindrical member through a drawing operation so that a difference between the inclination angles of the first inclined cylindrical parts and the second inclined cylindrical parts made smaller,
• wherein the drawing operation includes increasing the inclination angle of the second inclined cylindrical parts while maintaining the inclination angle of the first inclined cylindrical parts.