Dynamic damper and propeller shaft

A dynamic damper comprising an outer pipe, having a plurality of convex portions protruded in the direction of the inside diameter provided at a plurality of positions along the circumference of the outer pipe, a single weight disposed inside the outer pipe and an elastic body interposed between the outer pipe and the weight,

• the elastic body is held between the convex portion and the outer circumference of the weight,
• a stopper portion disposed on the weight, the stopper portion being engagable with the convex portion of the outer pipe in the axial direction of the outer pipe by relative moving of the outer pipe and the weight,
• wherein the outer pipe is bent in the direction of the inside diameter at plural portions along the circumferential direction so as to form the convex portions and the convex portion of the outer pipe slides on an insertion guide face provided on the stopper portion of said weight so as to enlarge elastically the diameter of the convex portion to a diameter larger than the diameter of the stopper portion so that the outer pipe fits to the outer circumference of the weight.

A dynamic damper comprising an outer pipe, having a plurality of convex portions protruded in the direction of the inside diameter provided at a plurality of positions along the circumference of the outer pipe, a single weight disposed inside the outer pipe and an elastic body interposed between the outer pipe and the weight,

• the elastic body is held between the convex portions and the outer circumference of the weight,
• a stopper portion disposed on the weight, the stopper portion being engagable with the convex portions of the outer pipe in the axial direction of the outer pipe by relative moving of the outer pipe and the weight,
• wherein the outer pipe is bent in the direction of the inside diameter at plural portions along the circumferential direction so as to form the convex portions of the outer pipe slide on an insertion guide face provided on the stopper portion of said weight so as to enlarge elastically the diameter of the convex portions to a diameter larger than the diameter of the stopper portion so that the outer pipe fits to the outer circumference of the weight.

A dynamic damper comprising an outer pipe, having a plurality of convex portions protruded in the direction of the inside diameter provided at a plurality of positions along the circumference of the outer pipe, a single weight disposed inside the outer pipe and an elastic body interposed between the outer pipe and the weight,

• the elastic body is held between the convex portions and the outer circumference of the weight,
• a stopper portion disposed on the weight, the stopper portion being engagable with the convex portions of the outer pipe in the axial direction of the outer pipe by relative moving of the outer pipe and the weight,
• wherein the outer circumferential portion of the elastic body is nipped between the convex portions adjacent to each other of said outer pipe, the outer pipe is bent in the direction of the inside diameter at plural portions along the circumferential direction so as to form the convex portions, and the convex portion of the outer pipe slides on an insertion guide face provided on the stopper portion of said weight so as to enlarge elastically the diameter of the convex portion to a diameter larger than the diameter of the stopper portion so that the outer pipe fits to the outer circumference of the weight.