Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1994-12-06
1996-11-19
Cuda, Irene
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
B23P 1500
Patent
active
055750648
ABSTRACT:
In producing a rocker arm, following steps are used: fabricating a rocker arm blank which includes: a rocker arm body having an aperture therein adapted to be converted to a hole for the insertion of a shaft, and which blank is made of a nitrided steel comprising specified amounts of C, Mn, Cr, Al, Si, P, S, Cu, Ni, one of Pb and Bi, and optionally Mo, and, as the balance substantially, Fe; and a slipper surface forming piece; subjecting the rocker arm blank to a refining treatment to adjust its hardness; subjecting the apertures to reaming to form the shaft insertion holes; and subjecting the rocker arm blank with the shaft insertion holes formed therein to a nitriding treatment. Thus, it is possible to mass-produce rocker arms for an internal combustion engine, each of which has excellent mechanical properties.
REFERENCES:
patent: 1649398 (1927-11-01), Fry
patent: 3166835 (1965-01-01), Kolbe
patent: 4624223 (1986-11-01), Wherry et al.
patent: 4825717 (1989-05-01), Mills
patent: 4829647 (1989-05-01), Anderson
patent: 4848180 (1989-07-01), Mills
patent: 4955121 (1990-09-01), Sato et al.
K. Daeves, "Werkstoff--Handbuch Stahl Und Eisen", 1965.
Fujiwara Akira
Yakubo Kazushige
Yamada Noriyuki
Cuda Irene
Honda Giken Kogyo Kabushiki Kaisha
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