Wear resistant cast iron rocker arm and method of making same

Details Wear resistant cast iron rocker arm and method of making same Wear resistant cast iron rocker arm and method of making same

1992-04-21

1992-11-17

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Rocker

123 9051, F01L 118

Patent

active

051633914

ABSTRACT:
A wear-resistant cast iron rocker arm or similar machine element is formed by differential pressure, countergravity casting an iron melt of low superheat into a ceramic investment shell mold maintained initially at room temperature and rapidly solidifying the melt therein to provide a wear-resistant, as-cast microstructure throughout the body of the element. The as-cast microstructure comprises a dendritic constituent of austenite or transformed austenite (e.g., pearlite) depending on alloy composition and an interdendritic carbide constituent. Interdendritic ledeburite will also be present if the austenite remains untransformed. The as-cast microstructure of the rocker arm is devoid of graphite.

REFERENCES:
patent: 3690958 (1972-09-01), Thompson
patent: 4147074 (1979-04-01), Noguchi et al.
patent: 4438738 (1984-03-01), Kosuda et al.
patent: 4870931 (1989-10-01), Nakamura et al.
patent: 4873150 (1989-10-01), Doi et al.
patent: 5035959 (1991-07-01), Ito et al.

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