Short-stroke internal combustion engine

摘要

An internal combustion engine for a work tool has a cylinder with a combustion chamber. A piston is reciprocatingly mounted in the cylinder and delimits the combustion chamber. The crankshaft has bearing pins and at least one crank web. The bearing pin has a mounting end, and the crank web has a first receiving bore and a second receiving bore. The mounting end of the bearing pin is mounted in the first receiving bore. A crankcase is provided in which the crankshaft is rotatably mounted by the bearing pins. The crankshaft has a crank pin with a mounting end that is mounted in the second receiving bore of the crank web. A connecting rod has a first end connected to the piston and a second end connected to the crank pin. The crank pin has a longitudinal center axis and the crankshaft has an axis of rotation extending parallel to the longitudinal center axis. The longitudinal center axis and the axis of rotation are spaced at a stroke spacing from one another. The stroke spacing is identical to or smaller than the sum of the bearing pin radius of the mounting end of the bearing pin and a crank pin radius of the mounting end of the crank pin. The bearing pin radius and the crank pin radius are measured in the plane of the crank web.