Vehicle component part

Details Vehicle component part Vehicle component part

1987-04-09

1988-08-02

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

75244, 123 9039, 419 12, 428564, 428627, 4289088, B22F 300

Patent

active

047613440

ABSTRACT:
A rocker arm of a valve mechanism of an automotive internal combustion engine is composed of a rocker arm tip secured to a rocker arm main body. The rocker arm tip includes a sheet type sintered alloy adhered to a steel substrate. The sintered alloy includes a joining phase of martensite stainless steel, and a hard phase of boride and/or multiple boride of at least one, including iron, of elements capable of forming boride and/or multiple boride. The hard phase is homogeneously dispersed in the joining phase. The sintered alloy contains boron ranging from 3.0 to 5.0% by weight, and the hard phase ranging from 40 to 62% by weight. Additionally, the sintered alloy has a maximum grain size of the boride and/or multiple boride ranging not larger than 50 .mu.m, a Rockwell A-scale hardness number ranging not less than 80, and a deflective strength ranging not lower than 175 kgf/mm.sup.2.

REFERENCES:
patent: 3980444 (1976-09-01), Reen
patent: 4140170 (1979-02-01), Baum
patent: 4340432 (1982-07-01), Hede
patent: 4556533 (1985-12-01), Oaku et al.

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