Patent ID: 8468990
Filing Date: 2013-06-25
Classification: F01L

Abstract:
1. A continuously variable valve timing apparatus comprising: a camshaft holder fixed to a camshaft; a cam sprocket; a leadscrew screw-coupled with the camshaft holder and the cam sprocket and is movable so as to rotate the camshaft holder and the cam sprocket in opposite directions; and an operating unit operated by a motor and moves the leadscrew, wherein the operating unit comprises: wherein the camshaft holder and the cam sprocket are threaded in opposite directions; wherein the leadscrew includes opposing threads that are respectively coupled with the camshaft holder and the cam sprocket; wherein an interior circumference of the camshaft holder and an interior circumference of the cam sprocket are threaded in opposite directions; wherein the opposing threads of the leadscrew coupled with the interior circumference of camshaft holder and the interior circumference of cam sprocket are both formed on an exterior circumference of the leadscrew; and wherein an inner portion of the leadscrew is secured between protrusions of the screw nut.