Patent ID: 6679209
Filing Date: 2004-01-20
Classification: F01L

Abstract:
A valve timing control apparatus for an internal combustion engine comprising:a driving rotary member drivingly connected to a crankshaft; a driven rotary member drivingly connected to a camshaft; a plurality of radial guides provided to one of the driving rotary member and the driven rotary member; an intermediate rotary member rotatable relative to the driving rotary member and the driven rotary member and having at a side thereof a spiral guide of a single spiral; a plurality of guided members movably engaged with the respective radial guides and the spiral guide; a plurality of links connecting between the other of the driving rotary member and the driven rotary member and the respective guided members; a control force applying unit for applying to the intermediate rotary member a control force for rotating the intermediate rotary member to rotate relative to the driving rotary member and the driven rotary member; wherein rotation of the intermediate rotary member caused by the control force applying unit causes radial movement of the guided members which is in turn converted to relative rotation between the driving rotary member and the driven rotary member by the links; and wherein the spiral of the spiral guide is defined so that a variation rate of spiral radius per angle is not constant.