Patent ID: 9140147
Filing Date: 2015-09-22
Classification: F01L

Abstract:
1. A multiple variable valve lift apparatus, comprising: an engine-driven camshaft having a hollow cylinder shape; control shafts disposed in a hollow of the camshaft; a cam disposed on an exterior circumference of the camshaft to rotate together with the camshaft; a cam rod connecting the control shaft with the cam such that the control shaft and the cam move together; an operating unit disposed on the exterior circumference of the camshaft to rotate together with the camshaft; an operating unit rod connecting the control shaft with the operating unit such that the control shaft and the operating unit move together; a solenoid selectively connected with the operating unit, and moving the operating unit along an axial direction of the camshaft; and a tappet contacting the cam to transform rotational motion of the cam to rectilinear motion of a valve; wherein the cam includes at least two cams in which shapes of cam lobes are different from each other and move together with the operating unit along the axial direction of the camshaft such that a cam contacting to a tappet of one of the at least two cams is selected, wherein the control shafts are separately provided such that the number of the control shafts corresponds to the number of cylinders formed in an engine, and the control shafts are respectively connected to at least one cam of the at least two cams to independently control valve lift in each cylinder of the engine.