Patent ID: 6523509
Filing Date: 2003-02-25
Classification: F02B

Abstract:
An internal combustion engine for a portable handheld work apparatus including a motor-driven chain saw, cutoff machine, brushcutter or the like, the internal combustion engine comprising:a cylinder having a cylinder wall; a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during operation of said engine; said cylinder and said piston conjointly delimiting a combustion chamber; a crankcase connected to said cylinder; a crankshaft rotatably mounted in said crankcase; a connecting rod connecting said piston to said crankshaft to permit said piston to drive said crankshaft as said piston reciprocates in said cylinder; a mixture forming device for supplying a fuel containing mixture to said combustion chamber; a channel segment formed in said cylinder wall and communicating with said combustion chamber via a controlled window; a connecting piece fixedly attached to said cylinder; a bypass channel communicating with said channel segment via said connecting piece to supply essentially fuel free air to said combustion chamber; a spark plug arranged in said combustion chamber; an ignition device mounted in the region of said cylinder; and, said ignition device having a part thereof fixedly attached with at least one attachment point to said connecting piece.