Crankshaft And Manufacturing Method Therefor

Abstract: Provided is a crankshaft which has excellent fatigue strength and in which the formation of quenching cracks is suppressed. A crankshaft (10) comprising a pin portion (12) and a pin top portion (15), wherein: the pin portion (12) has a sliding portion (121) having a constant outer diameter and fillet portions (122) formed contiguously with the sliding portion (121); each fillet portion (122) has a hardened region (122a), which is a region where the hardness is higher than the hardness of the core portion of the sliding portion 121 by 100 HV or more, on the surface thereof; the thickness (d1) of the hardened region (122a) of a fillet portion (122) is at least 12.0% of the radius (R) of the sliding portion (121); and the prior-austenite grain size of the pin top portion (15) is 60 µm or less.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents