CRANKSHAFT AND METHOD OF MANUFACTURE

• Main Authors: DANIEL J. WILSON, QIGUI WANG, JIANGHUAI YANG, JAMES D. CREMONESI, PAUL J. GELAZIN
• Format: Patent
• Language: Chinese; English
• Published: 21.02.2020
• Subjects: ALLOYS; BEARINGS; BLASTING; CHEMISTRY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FERROUS OR NON-FERROUS ALLOYS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS

The present invention provides a method for manufacturing a crankshaft for an internal combustion engine with a plurality of journals having a hardened case with a first microstructure. The crankshaftis comprised of a steel comprising between about 0.3 wt % and 0.77 wt % Carbon. The first microstructure of the hardened case of the journals comprises between about 15% and 30% ferrite and a balanceof martensite and the resultant subsurface residual stress between 310 MPa and 620 MPa. 一种用于制造内燃机的曲轴的方法，曲轴具有多个轴颈，轴颈具有带有第一微结构的硬化壳体。曲轴由包含约0.3wt％至0.77wt％碳的钢构成。轴颈的硬化壳体的第一微观结构包含约15％至30％的铁素体和余量的马氏体，以及所生成的在310MPa和620MPa之间的表面下残余应力。