Abstract: A battery pack for a machining system has a cell assembly, a housing interior for holding the cell assembly, and a housing delimiting the housing interior. The cell assembly has a pretensioning device. The pretensioning device is designed to generate a pretensioning force acting on a solid-state battery cell of the cell assembly such that the pretensioning force does not fall below a specified minimum value when the housing expands relative to the cell assembly.

Abstract: 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.

Abstract: 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.

Abstract: 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° C. The fuel composition can also contain oxygen-containing organic compounds, aromatic compounds, olefins, and naphthenes.

Abstract: 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° C. The fuel composition can also contain oxygen-containing organic compounds, aromatic compounds, olefins, and naphthenes.

Abstract: A catalytic converter is provided for 2-cycle stratified scavenging engines or engines with comparable exhaust-gas composition, the converter having a wash coat with an active phase containing one or more noble metals on a heat-resistant carrier. The portion of an oxygen storage component in the wash coat is less than about 10 wt. %.

Abstract: A catalytic converter for the after-treatment of the exhaust gas from an internal combustion engine is provided. The catalytic converter has a housing having an internal space for receiving exhaust gas therethrough. Surfaces of walls of the housing facing the internal space are at least partially provided with catalytically active material in a flow path between inlet and outlet openings for exhaust gas. Hollow domes are provided on oppositely disposed walls of the housing, and extend into the internal space. The free ends of the hollow domes are provided with the outlet openings, and the free ends of those hollow domes on one of the walls extend beyond the free ends of the hollow domes of the oppositely disposed wall.

Abstract: 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 (7) with a combustion chamber (34) which is delimited by the reciprocating piston (35). The piston (35) drives a crankshaft (38) which is rotatably journalled in a crankshaft housing (37) via a connecting rod (36). In the combustion chamber (34) an outlet (29) is provided through which the oxygen-rich exhaust gases (16) and oxygen-poor exhaust gases (18) flow out. Transfer channels (40) are configured in the cylinder (7) for supplying an air/fuel mixture prepared by a mixture preparation device (39) and gas-feeding channels (41) are configured for supplying fuel-poor, oxygen-rich gases in the combustion chamber (34). An exhaust-gas muffler (2) is assigned to the outlet (29) according to the invention to obtain an exhaust-gas quality which remains the same.

Abstract: 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 (7) with a combustion chamber (34) which is delimited by the reciprocating piston (35). The piston (35) drives a crankshaft (38) which is rotatably journalled in a crankshaft housing (37) via a connecting rod (36). In the combustion chamber (34) an outlet (29) is provided through which the oxygen-rich exhaust gases (16) and oxygen-poor exhaust gases (18) flow out. Transfer channels (40) are configured in the cylinder (7) for supplying an air/fuel mixture prepared by a mixture preparation device (39) and gas-feeding channels (41) are configured for supplying fuel-poor, oxygen-rich gases in the combustion chamber (34). An exhaust-gas muffler (2) is assigned to the outlet (29) according to the invention to obtain an exhaust-gas quality which remains the same.

Abstract: The invention relates to a filter element of at least two filter layers (10, 20) wherein the one filter layer (20) is formed from a non-woven fabric (21) and the other filter layer (10) is of an open-pore foam (11) which is attached to the one filter layer (20). Furthermore, a carrier is provided which supports the filter element (1). In order to properly mount the filter element in the filter housing, the non-woven fabric is a felt (21) stiffened by impregnation with a curing liquid. The felt (21) imparts rigidity as a carrier to the filter element (1).