| 摘要 |
PROBLEM TO BE SOLVED: To provide a coil spring capable of improving durability against the contact of mutual wires by reducing a hysteresis loss caused by frictional resistance with a mating member. SOLUTION: An arc spring 41 is arranged in a clutch unit 1. For reducing the hysteresis loss, an abrasion resistant layer having a friction coefficientμsmaller than 0.15 and a hardness of Hv1000 or larer is formed on a surface of the arc spring 41. The abrasion resistant layer is an MoS<SB>2</SB>layer (a molybdenum disulfide layer), an electroless NiP layer (an electroless nickel phosphorus layer), a DLC layer (a diamond-like carbon layer) or a TiN layer (a titanium nitride layer). Except the case using the MoS<SB>2</SB>layer, abrasion resistance can also be improved. Particularly in the DLC layer, since the hardness is about HV3000, the DLC layer is suitably formed on a coil spring surface indicated in Fig.2 of requiring high abrasion resistance. COPYRIGHT: (C)2011,JPO&INPIT |
