Mechanical control element having wear-resistant surface

Details Mechanical control element having wear-resistant surface Mechanical control element having wear-resistant surface

1981-11-06

1984-10-16

Feinberg, Craig R.

Internal-combustion engines

Poppet valve operating mechanism

Rocker

291567R, 148 35, F01L 118

Patent

active

044768249

ABSTRACT:
Arrangement for providing an enhanced wear-resistant contact region for a cast iron mechanical control element such as a rocker arm. The control element is cast in a desired shape. It is then preheated to a temperature between room temperature and the Ms temperature of the iron element (Ms temperature is a function of the carbon content of the iron) to adjust the total hardness of the iron element. A surface region of a cast iron control element, intended for forming the contact region, is partially melted and then cooled to create a hard ledeburitic structure which has a mixed crystal structure and is at least partly martensitic and has a mixed hardness of at least 670 Hv.

REFERENCES:
patent: 2901386 (1959-08-01), Saives
patent: 3690958 (1972-09-01), Thompson
patent: 4000011 (1976-12-01), Sato et al.
patent: 4124413 (1978-11-01), Komatsu et al.
patent: 4153477 (1979-05-01), Beyer et al.

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