| 摘要 |
A drive rotation member is rotated about a given axis by a crankshaft of the engine, and a driven rotation member is rotated about the given axis together with a camshaft of the engine. A relative rotation angle control mechanism is arranged through which the drive and driven rotation members are coaxially connected. The relative rotation angle control mechanism has a movable control member which, when applied with an operation force from an actuation device, varies a relative rotation angle between the drive and driven rotation members. The actuation device comprises a first electromagnetic brake which applies an operation force to the movable control member to cause a rotation of the driven rotation member to be shifted in one of advancing and retarding directions with respect to a rotation of the drive rotation member, and a second electromagnetic brake which applies an operation force to the movable control member to cause the rotation of the driven rotation member to be shifted in the other of the advancing and retarding directions with respect to the rotation of the drive rotation member.
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