Stock material or miscellaneous articles – All metal or with adjacent metals
Patent
1998-03-12
2000-01-25
Jones, Deborah
Stock material or miscellaneous articles
All metal or with adjacent metals
148208, 148212, 148215, 148230, 148233, 148580, 148599, 148660, 148901, 148908, 267166, 428592, 428906, B21F 3500, C21D 902
Patent
active
060176415
ABSTRACT:
A coil spring made of an oil-tempered steel wire with internal hardness of more than Hv 550 in cross-section, the surface hardness of the oil-tempered steel wire being determined in an extent between Hv 420 in a minimum value and hardness defined by subtraction of Hv 50 from the internal hardness in a maximum value.
REFERENCES:
Nishimura et al, SAE Technical Paper Series No. 890777, The Engineering Society for Advancing Mobility Land Sea Air and Space, "The Valve Springs Carbo-Nitrided at a High Temperature for High Speed Engines", International Congress and Exposition Detroit, Michigan, Feb. 27-Mar. 3, 1989.
Aoki Toshinori
Nishimura Taisuke
Otowa Takashi
Chuo Hatsujo Kabshiki Kaisha
Honda Giken Kogyo Kabushiki Kaisha
Jones Deborah
Koehler Robert R.
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