Integrated sprocket and housing and manufacturing method...

Details Integrated sprocket and housing and manufacturing method... Integrated sprocket and housing and manufacturing method...

2007-02-20

2007-02-20

King, Roy (Department: 1742)

Metal treatment

Stock

Carburized or nitrided

C474S152000, C474S161000

Reexamination Certificate

active

10666858

ABSTRACT:
An integrated sprocket and housing used in a variable valve timing mechanism. The integrated sprocket and housing includes: a sprocket portion which is formed in a substantially annular shape, and which has teeth on the outer circumference thereof; and a housing portion which is disposed inside the sprocket portion, which has recesses in the inside thereof, and which is formed integrally with the sprocket portion as a sintered body made of a ferrous powder material, wherein the entire surface of the sprocket portion and the housing portion is covered with a steam oxidized layer which is formed by a steam treatment, and a nitrided layer which is formed by a gas soft nitriding treatment subsequent to the steam treatment.

REFERENCES:
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patent: 6314929 (2001-11-01), Macyama et al.
patent: 6318327 (2001-11-01), Takahashi et al.
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patent: 11-093628 (1999-04-01), None
patent: 2001-342981 (2001-12-01), None

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