| 摘要 |
PROBLEM TO BE SOLVED: To substantially increase a sliding torque by providing a polymethylene polyphenyl polyisocyanate as an antislipping agent on arm interface between a hub or mass body composed of metal parts and an elastic body. SOLUTION: A metal mass body 2 is concentrically arranged on the peripheral side of the metal hub 1 attached to an outer periphery of an crankshaft end, and an elastic body 4 is press-inserted from an axial one side into a gap 3 between both parts 1, 2, and the hub 1 and the mass body 2 are thereby coupled. The elastic body 4 is annularly formed of a fixed rubber-shaped elastic material, and in order to severally provide an antislipping agent on an interface 5 between the hub 1 and the elastic body 4 and that 6 between the mass body 2 and the elastic body 4, a polymethylene polyphenyl polyisocyanate is applied to at least the outer periphery of a cylindrical part 1c on the side of an outer periphery of the hub 1 and an inner periphery of the mass body 2. Thus, a sliding torque can be sharply increased even at an initial time and after thermal deterioration and an endurance test. |
