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Wool cycling jerseys;
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Technical Examples
A valve drive for charge-cycling valves of internal combustion engines, which are held in the closed position by means of spring force, and can optionally be activated by a main cam or additionally by a secondary cam of a camshaft, in which connection the main cam with its elevation curve and angle setting is adapted to the crankshaft of a charge-cycling process to be controlled, and the secondary cam operates separately from the main cam. The drive variably controls an additional opening procedure of a charge-cycling valve, separate from the charge-cycling stroke to be controlled directly, in order to sensitively regulate the exhaust gas feed-back in this manner. The drive has two engagement surfaces for introducing movements on a pivot lever mounted on the cylinder head, which activates at least one charge-cycling valve. The first engagement surface on the pivot lever engages the main cam and the second engagement surface on the pivot lever contacts a transfer device for variable adjustment of the valve lift, driven by the second cam.