The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2007
Filed:
Mar. 10, 2006
Heiko Rosskamp, Adelberg, DE;
Jörg Schlossarczyk, Winnenden, DE;
Konrad Knaus, Gaildorf, DE;
Gerhard Osburg, Kernan, DE;
Heiko Rosskamp, Adelberg, DE;
Jörg Schlossarczyk, Winnenden, DE;
Konrad Knaus, Gaildorf, DE;
Gerhard Osburg, Kernan, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
A two-stroke engine is for a portable handheld work apparatus such as a motor-driven chain saw, cutoff machine, brushcutter or the like. A combustion chamber () is configured in the cylinder () of the engine () and is delimited by a reciprocating piston (). The piston () drives a crankshaft () via a connecting rod (). The crankshaft () is rotatably journalled in the crankcase (). The two-stroke engine includes a discharge opening () for conducting exhaust gases out of the combustion chamber () and an inlet () via which an air/fuel mixture is conducted to the crankcase (). The air/fuel mixture passes via at least one transfer channel () from the crankcase () into the combustion chamber (). The transfer channels () open at one end with a transfer window () into the combustion chamber () and are connected at the other end to the crankcase (). A bypass channel () conducts essentially fuel-free gas and opens via a membrane valve () into the transfer channel (). The sum of all areas of the inlet windows () referred to the piston displacement of the engine is approximately 1.4 mm/cmto approximately 5.90 mm/cmwhereby good exhaust-gas values are obtained at low fuel consumption.