Valve timing control device for internal combustion engine
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United States of America Patent
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Sep 25, 2018
Grant Date -
Sep 22, 2016
app pub date -
Nov 11, 2014
filing date -
Dec 11, 2013
priority date (Note) -
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Abstract
A front plate for a valve timing control device is produced which comprises a plate part that closes a front opening of a housing body to seal operation oil chambers in the housing body and a cylindrical part that is integral with and projected forward from an opened central portion of the plate part and after production of the front plate, an annular part of a front surface of the plate part near a root portion of the cylindrical part is pressed, by a press machine, toward a rear surface of the plate part against a supporting tool that intimately supports the rear surface of the plate part, so that the rear surface of the plate part has an improved flatness at an annular area surrounding the opening of the front plate thereby to increase a sealability between the plate part and the front opening of the housing body.
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