Patent ID: 7222596
Filing Date: 2007-05-29
Classification: F01L

Abstract:
1. A valve drive for charge-cycling valves of internal combustion engines, which are held in a closed position by means of spring force, comprising: a main cam and a second cam of a camshaft for activating the valves, wherein connection of the main cam with its elevation curve and angle setting is adapted to the crankshaft of a charge-cycling process to be controlled, and wherein the second cam operates separately from the main cam; and first and second engagement surfaces for introducing movements, said surfaces being disposed, in different positions, on a pivot lever mounted on a cylinder head of the engine, said lever activating at least one of said charge-cycling valves; wherein the first engagement surface on the pivot lever engages the main cam and wherein the second engagement surface contacts a transfer device for variable adjustment of a valve lift for feedback of exhaust gas into the cylinder chamber or also into the intake pipe, wherein said valve lift is driven by the second cam and wherein the transfer device comprises an element having a variable position and which is disposed in a fixed location in the cylinder head, and wherein the valve lift is variable and adjustable based on a structure and set angle position of said element.