Patent ID: 8851032
Filing Date: 2014-10-07
Classification: F01L

Abstract:
1. A valve timing controller which varies a rotational phase of a camshaft relative to a crankshaft of an internal combustion engine, comprising: a variable-camshaft-timing mechanism which adjusts a rotational phase of the camshaft by using of a differential hydraulic pressure between a pressure in an advance chamber and a pressure in a retard chamber; an oil flow control valve which controls the differential hydraulic pressure; and an electric actuator which drives the oil flow control valve, wherein: the oil flow control valve is provided with the spool comprising a spool sleeve and defining a spool passage through which the working fluid flows toward the advance port and the retard port; the spool is provided with a sliding plug which closes one end of the spool passage and is in contact with a driving shaft of the electric actuator; the sliding plug has a flow-direction-changing portion which changes a fluid flow direction from a radial direction to an axial direction so that the working fluid is introduced into the spool passage; a check valve is provided in the spool passage in such a manner that the check valve permits a fluid flow from the flow-direction-changing portion toward the spool passage and prohibits a fluid flow from the spool passage toward the flow-direction-changing portion; the check valve is a spiral spring valve which has multiple windings; each of the windings is formed in such a manner as to come in contact with each other in an axial direction thereof; and the check valve is retained between an annular step formed on an inner wall surface of the spool sleeve and the flow-direction-changing portion.