Method of making a valve lifter

Details Method of making a valve lifter Method of making a valve lifter

2007-12-18

2007-12-18

Bryant, David P. (Department: 3726)

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

C029S888430, C029S888400, C029S458000, C029S527100, C123S090510, C123S090610

Reexamination Certificate

active

11375325

ABSTRACT:
A valve lifter and a method of manufacture thereof is provided in which sliding properties of a cam on a cam-contacting sliding surface in an upper surface of a valve lifter are improved by forming the cam-contacting sliding surface as a concave surface to permit retention of lubricating oil therein. The cam-contacting sliding surface is integrally provided in an outer wall of an upper part of a valve lifter. The cam-contacting sliding surface is formed as a concave surface to provide better retention of the lubricating oil. The concave sliding surface is formed during high temperature oxidation of the valve lifter by permitting the natural slumping down of the upper part due to its own weight under the gravity.

REFERENCES:
patent: 4509803 (1985-04-01), Takenaka et al.
patent: 5129372 (1992-07-01), Seiberth et al.
patent: 5743224 (1998-04-01), Hosaka et al.
patent: 5879816 (1999-03-01), Mori et al.
patent: 09-195723 (1997-07-01), None

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