Patent ID: 7543554

Claim:
A two-stroke motor, in particular for a portable, hand-guided working device such as a motor chain saw, a motor lawnmower, a parting-off grinder or the like, with a combustion space formed in a cylinder bounded by a piston guided in the cylinder so that it performs a lifting movement, which piston drives a crankshaft rotatably mounted in a crankcase space by means of a connecting rod, comprising: at least one transfer port which connects the crankcase space to the combustion space in predetermined piston positions in a fluidic manner, wherein the transfer port is formed at least from a combustion-space-side opening section, a rising section and a crankcase-space-side inlet section, and wherein the opening section is connected to the inlet section by the rising section arranged approximately parallel to the piston cylinder; characterised in that 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 into a second partial port at least in the region of the rising section adjoining the opening section, wherein the division commences behind the deflection region in the opening section so that it divides the transfer port into a first and second partial port only in the region of the opening section adjoining the combustion space.