| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drive plate allowing to satisfy both of a hardened tooth-shaped portion and reduced manufacturing cost, and a manufacturing method for the same. <P>SOLUTION: A drive plate includes a disk-shaped plate portion 10; and a tooth-shaped portion 2 formed at an outer peripheral end of the plate portion 10. The plate portion 10 and the tooth-shaped portion 2 are integrally shaped from a single steel plate material. The plate portion 10 and the tooth-shaped portion 2 include carburized layers 15, 25 provided over an entire surface layers of the plate portion and the tooth-shaped portion, the carburized layer having a carbon concentration higher than that of a thickness-direction center portion of the plate portion and the tooth-shaped portion. The carburized layer 15 of the plate portion 10 is higher in hardness than the center portion 17 of the plate portion in the thickness direction. The carburized layer 25 of the tooth-shaped portion 2 has been subjected to a quenching process, and is further higher in hardness than the carburized layer 15 of the plate portion 10. The carbon concentration in center portions 17 and 27 of the plate portion 10 and the tooth-shaped portion 2 in the thickness direction is 0.2 mass% or less and the carbon concentration of the carburized layers 15 and 25 exceeds 0.2 mass%. <P>COPYRIGHT: (C)2013,JPO&INPIT |
