Patent ID: 6539911
Filing Date: 2003-04-01
Classification: F01M,F02B

Abstract:
In a cam drive for an internal combustion engine, in a manually guided implement, having a cylinder in which is formed a combustion chamber that is delimited by a cylinder wall, a cylinder head, and a piston disposed in the cylinder, wherein disposed in said cylinder head is a poppet valve, a valve stem of which is driven by a pivotable rocker arm from a valve control mechanism that is provided with a control cam having a cam surface on which rests a contact lever that transfers cam lift to one end of said rocker arm, the improvement wherein:said control cam is rotatably mounted in a cam chamber in the vicinity of said cylinder wall, wherein a through-bore is formed in said cylinder wall, wherein a first open end of said through-bore is disposed in a cylinder bore of said cylinder wall at a level of said piston when the latter is in a lower dead center position, and wherein a second open end of said through-bore opens into said cam chamber in the vicinity of said control cam approximately at a level of an end face of said control cam.