Andreas Stihl Ag Co. Kg

Andreas Stihl Ag & Co.

Holger Lochmann

Heiko Rosskamp

Matthias Hans

Christina Wedel

Andreas Totschnig

Konrad Ehmann

Axel Rauch

Stefan Schweiger

A autonomous mobile green area maintenance robot, includes: a first motor-driven treatment tool, a second motor-driven treatment tool differing from the first treatment tool, and an open protective housing with a lateral rim. The first treatment tool defines a first treatment zone and is arranged within the protective housing such that the first treatment zone is located in a safety zone of the protective housing. The safety zone has a safety distance to the lateral rim. The second treatment tool defines a second treatment zone, wherein the second treatment zone is located at least partially beyond the safety zone. The autonomous mobile green area maintenance robot has an autonomous operation mode, wherein in the autonomous operation mode, a maximum kinetic energy of the second motor-driven treatment tool is smaller than a maximum kinetic energy of the first motor-driven treatment tool.

Autonomous mobile green area maintenance robot

A fuel composition contains at least 74% by volume of C4 to C14 isoalkanes and, pursuant to the determination of the distillation characteristics according to DIN EN ISO 3405, at least 25% by volume of the fuel composition evaporate at temperatures above 110&#xb0; C. The fuel composition can also contain oxygen-containing organic compounds, aromatic compounds, olefins, and naphthenes.

Fuel composition

The invention relates to an internal combustion engine and especially to a drive motor in a portable handheld work apparatus such as a motor-driven chain saw, cutoff machine or the like. The engine is formed from a cylinder ( ) with a combustion chamber ( ) which is delimited by the reciprocating piston ( ). The piston ( ) drives a crankshaft ( ) which is rotatably journalled in a crankshaft housing ( ) via a connecting rod ( ). In the combustion chamber ( ) an outlet ( ) is provided through which the oxygen-rich exhaust gases ( ) and oxygen-poor exhaust gases ( ) flow out. Transfer channels ( ) are configured in the cylinder ( ) for supplying an air/fuel mixture prepared by a mixture preparation device ( ) and gas-feeding channels ( ) are configured for supplying fuel-poor, oxygen-rich gases in the combustion chamber ( ). An exhaust-gas muffler ( ) is assigned to the outlet ( ) according to the invention to obtain an exhaust-gas quality which remains the same. A structure ( ) is provided in the exhaust-gas muffler ( ) for the temporary storage of the oxygen-rich exhaust gases ( ).

Internal combustion engine as a drive engine in a portable handheld work apparatus

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Waiblingen, Germany

Holger Lochmann