Camshaft

Details Camshaft Camshaft

1989-01-24

1990-03-06

Albritton, C. L.

Machine element or mechanism

Elements

Cams

21912117, 21912138, 21912166, F16H 5300

Patent

active

049055380

ABSTRACT:
A camshaft of a valve operating system for an internal combustion engine, is formed of iron-based alloy casting and has cam sections, each of which is in slidable contact with a heat resistant tip of a rocker arm. The cam section is formed at its surface portion with a surface hardened layer formed of an air-cooled chilled structure. The surface hardened layer is formed by remelting a part of the surface of the casting after preheating. An intermediate hardened layer of a heat affected zone is formed in contact with the surface hardened layer and has a thickness ranging from 0.5 to 2.0 mm. The intermediate hardened layer is formed of a mixed structure of bainite transformation phase and troostite and is formed by being thermally affected during the remelting.

REFERENCES:
patent: 4686349 (1987-08-01), Kawazu et al.

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