VALVE OPENING/CLOSING TIMING CONTROL DEVICE, AND PRODUCTION METHOD FOR DRIVE SIDE ROTATIONAL BODY OF VALVE OPENING/CLOSING TIMING CONTROL DEVICE
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United States of America Patent
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Issued Date -
Jan 21, 2016
app pub date -
Mar 14, 2014
filing date -
Apr 10, 2013
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Abstract
A valve opening/closing timing control device includes a housing main body that includes an opening which opens to at least one side in a direction along a rotational axis and a cover plate closing the opening by making contact with an end surface of the opening, the drive side rotational body rotating synchronously with a crankshaft, and a driven side rotational body housed within the drive-side rotational body and defining an advance chamber and a retardation chamber relative to an inner peripheral surface of the housing main body, the driven-side rotational body rotating integrally with a camshaft and coaxially with the rotational axis. In addition, the housing main body includes a hard layer formed at least at the inner peripheral surface of the housing main body in a surface thereof excluding the end surface of the opening.
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