Abstract: In order to provide a two-stroke motor, in particular for a portable, hand-guided working device with a combustion space formed in a cylinder and a piston guided in the cylinder so that it performs a lifting movement, at least one transfer port is provided which is formed at least from a combustion-space-side opening section, a rising section and a crankcase-space-side inlet section. The opening section is connected to the inlet section by the rising section arranged approximately parallel to the piston barrel. The motor has a small flow resistance because of its geometric design, despite maintaining small opening windows into the combustion space, and allows simple casting production. The transfer port forms in the inlet section a whole port which passes in a single-flow manner into the rising section and is divided by a division at least into a first partial port and a second partial port at least in the upper region of the rising section adjoining the opening section.

Abstract: To provide an exhaust system (100) for a combustion engine having a housing (10) in which at least one aperture for an exhaust gas inlet (11) and an additional aperture for an exhaust gas outlet (12) are provided, and having a catalytic element that is arranged in the housing (10) of the exhaust system (100) for cleaning exhaust gases from the combustion engine, and which can be manufactured simply and inexpensively, yet still achieves a high conversion rate to satisfy increasingly stringent environmental regulations, it is suggested to arrange at least one cleaning unit (13) including at least the described catalytic element (14) and a reflection means (15) in housing (10) of the exhaust system (100), in which some or all of the exhaust gases are directed through the catalytic element (14) of the cleaning unit (13) before reaching the reflection means (15) disposed behind it, which directs the exhaust gases (22) through the catalytic element (14) again, this time from the other side.

Abstract: In order to provide a two-stroke motor, in particular for a portable, hand-guided working device with a combustion space formed in a cylinder and a piston guided in the cylinder so that it performs a lifting movement, at least one transfer port is provided which is formed at least from a combustion-space-side opening section, a rising section and a crankcase-space-side inlet section. The opening section is connected to the inlet section by the rising section arranged approximately parallel to the piston barrel. The motor has a small flow resistance because of its geometric design, despite maintaining small opening windows into the combustion space, and allows simple casting production. The transfer port forms in the inlet section a whole port which passes in a single-flow manner into the rising section and is divided by a division at least into a first partial port and a second partial port at least in the upper region of the rising section adjoining the opening section.

Abstract: To provide an exhaust system (100) for a combustion engine having a housing (10) in which at least one aperture for an exhaust gas inlet (11) and an additional aperture for an exhaust gas outlet (12) are provided, and having a catalytic element that is arranged in the housing (10) of the exhaust system (100) for cleaning exhaust gases from the combustion engine, and which can be manufactured simply and inexpensively, yet still achieves a high conversion rate to satisfy increasingly stringent environmental regulations, it is suggested to arrange at least one cleaning unit (13) including at least the described catalytic element (14) and a reflection means (15) in housing (10) of the exhaust system (100), in which some or all of the exhaust gases are directed through the catalytic element (14) of the cleaning unit (13) before reaching the reflection means (15) disposed behind it, which directs the exhaust gases (22) through the catalytic element (14) again, this time from the other side.