Crankshaft assembly of an internal combustion engine

摘要

The invention is directed to a crankshaft ( 1 ) of an internal combustion engine including an internal combustion engine for a portable handheld work apparatus such as a motor-driven chain saw or the like. The invention is also directed to a method for making the crankshaft ( 1 ) as well as an internal combustion engine with a corresponding crankshaft ( 1 ). The crankshaft ( 1 ) is made up of separately manufactured parts and includes a crank arm ( 2 ) having a central cutout ( 3 ) for accommodating a shaft lug ( 4 ) of the crankshaft ( 1 ) and an eccentric cutout ( 5 ) for accommodating a crank pin ( 6 ). The crank pin ( 6 ) journals a connecting rod ( 7 ). A centrifugal mass portion ( 8 ) is provided on the crank arm ( 2 ) at its end lying opposite the eccentric cutout ( 5 ). The centrifugal mass portion ( 8 ) is configured as one piece with the crank arm ( 2 ) and is bent out of a plane ( 9 ) of the crank arm ( 2 ) in the direction of the connecting rod ( 7 ).