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Development of High-strength Induction Hardened Crankshaft

Article of Honda R&D Technical Review Vol.15 No.2

Summary

A high fatigue strength and wear resistance induction hardened crankshaft has been developed for diesel engines. Crankshafts for use in diesel engines must be engineered to tolerate the high loads generated by high in-cylinder pressures, and be capable of resisting wear caused by the carbon which collects in the lubricating oil as a combustion by-product. Simultaneous hardening of the shaft and the fillet has been adopted in the newly developed crankshaft to achieve high strength while reducing the number of production processes, resulting in the development of a crankshaft with excellent fatigue strength, resistance to wear, and mass producibility. A special material was developed for the crankshaft to enable the curvature occurring during induction hardening of the fillet to be easily corrected. In addition, control of inclusions in materials has enabled the lead component, conventionally added to increase machinability, to be removed without sacrificing workability.

Reference

(1) Iwama, N.: Trend of Special Steel for Automotive Parts, Journal of Society of Automotive Engineers of Japan, Vol. 55, No. 10, p. 64 (2001)
(2) Hamazaki, A., Kobayashi, Y.: Current State of SMI's Die Forged Products for Automobiles, SUMITOMO METALS, Vol. 48, No. 4, p. 49 (1996)
(3) Sato, T.: Micro-alloyed High-strength Steel, SUMITOMO METALS, Vol. 45, No. 4, p. 121 (1993)
(4) Kurita, M., Toyama, K.: Effects of Strengthening Mechanisms on Fatigue Properties of Ferrite Pearlite Hot-Rolled Sheet Steel, TETSU-TO-HAGANE, Vol. 80, No. 1, p. 66 (1994)
(5) Kurebayashi, Y., Nakamura, S.: A Case Hardening Steel, “ALFA Steel”, for Cold Forging, DENKI-SEIKO, Vol. 69, No.1, p. 57 (1998)
(6) Amataka, A., Suwa, S.: Development of Pb-free Free-cutting Steel Enabled to Omit Normalizing for Crankshafts, Honda R&D Technical Review, Vol. 14, No. 1, p. 141 (2002)

Author (organization or company)

Hayato ONDA(Tochigi R&D Center)、Tetsuya ASAI(Tochigi R&D Center)、Kenji FUJIKI (Tochigi R&D Center)、Hirotsugu KUDO(Tochigi R&D Center)、Kazumasa MUROFUSHI(Tochigi R&D Center)

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