Importance

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Abstract

An internal combustion piston engine based on a four-stroke process, having a crankcase in which at least one cylinder/piston assembly is arranged, the piston being guided by a connecting rod connected to a crankshaft. At least one cylinder head (1) closes the cylinder, each of whose intake and exhaust channels are controlled by at least one intake valve and at least one exhaust valve (2, 2a). The intake and exhaust valves are actuable by a finger lever or a rocker arm driven by a camshaft (12) through intake and exhaust cams. The finger levers or rocker arms are guided on at least one axle (10). At least one additional cam is provided in the region of the base circle of the outlet cam for an additional opening of the at least one exhaust valve (2, 2a), and a control element is installed between the finger lever or rocker arm and the exhaust valve or valves (2, 2a), which control element can be connected to a pressure oil source and has a variable length, so that the additional cam is active during a compression relief operation and inactive during a pure engine operation. The control element is configured as an inflating element (8) and is operatively connected through a working piston (7), with interposition of a spacer, to a bridge (4) associated to a plurality of exhaust valves (2, 2a), or is operatively connected to a valve stem of an exhaust valve.

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First Claim