Patent ID: 8813704

Claim:
A continuous variable valve duration apparatus comprising: a camshaft including a camshaft slot, the camshaft being rotationally centered about a camshaft axis; a cam portion including a cam and a cam slot, the cam portion having a cam axis coaxial with the camshaft axis and a variable phase angle relative to the camshaft; and a duration control portion which varies the phase angle between the camshaft slot and the cam slot; wherein the duration control portion comprises: a roller guide portion; and a roller ring which is rotatably disposed to the roller guide portion and is connected to the camshaft slot and the cam slot; wherein a rotational center axis of the roller guide portion is parallel to the camshaft axis, and the rotational center axis of the roller guide portion is varied; and wherein the duration control portion comprises: a hinge connected to one side of the roller guide portion; and a roller guide portion control portion selectively rotating the roller guide portion around the hinge.