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:
Aug. 23, 2005
Filed:
Nov. 12, 2004
Andreas Lingen, Allmersbach, DE;
Matthias Hehnke, Schorndorf, DE;
Joachim Baumhauer, Schwäbisch Gmünd, DE;
Andreas Bähner, Weinstadt, DE;
Michael Joos, Fellbach, DE;
Axel Klimmek, Schwaikheim, DE;
Hans Holderle, Freiberg, DE;
Andreas Lingen, Allmersbach, DE;
Matthias Hehnke, Schorndorf, DE;
Joachim Baumhauer, Schwäbisch Gmünd, DE;
Andreas Bähner, Weinstadt, DE;
Michael Joos, Fellbach, DE;
Axel Klimmek, Schwaikheim, DE;
Hans Holderle, Freiberg, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
A two-stroke engine () has a combustion chamber () disposed in a cylinder (). The combustion chamber () is delimited by a reciprocating piston (). The piston () drives a crankshaft () via a connecting rod () and the crankshaft () is rotatably journalled in a crankcase (). The two-stroke engine () has an intake channel () for the supply of fuel into the crankcase (), an outlet () for exhaust gases from the combustion chamber () and an air channel () for the supply of substantially fuel-free air. A throttle element () is mounted in the air channel (). At pregiven positions of the piston (), the crankcase () is connected via at least one transfer channel () to the combustion chamber (). In order to prevent air from being drawn by suction into the air channel because of leakages during idle or at low rpm, a fluid connection is provided between the air channel () downstream of the throttle element () and the crankcase () for underpressure compensation which connection is present at least partially for a position of the piston from 90° ahead of bottom dead center to 90° after bottom dead center. A connection between the crankcase () and the intake channel () can be provided in lieu of, or in addition to, the connection to the air channel ().