Patent ID: 6510826
Filing Date: 2003-01-28
Classification: F01L

Abstract:
A valve timing control device of an internal combustion engine, comprising:a drive rotation member rotated about a given axis by a crankshaft of the engine; a driven rotation member rotated about said given axis together with a camshaft of the engine; a relative rotation angle control mechanism through which said drive and driven rotation members are coaxially connected, said relative rotation angle control mechanism having a movable control member which, when radially moved by receiving an operation force, varies a relative rotation angle between said drive and driven rotation members; and an actuation device which applies an operation force to said movable control member, said actuation device comprising a first electromagnetic brake which applies an operation force to said movable control member to cause a rotation of said driven rotation member to be shifted in one of advancing and retarding directions with respect to a rotation of said drive rotation member; and a second electromagnetic brake which applies an operation force to said movable control member to cause the rotation of said driven rotation member to be shifted in the other of the advancing and retarding directions with respect to the rotation of said drive rotation member, said relative rotation angle control mechanism being so arranged that when both said first and second electromagnetic brakes of said actuation device become deenergized, a certain relative rotation angle is provided between said drive and driven rotation members, which is suitable for starting of the engine.