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:
Dec. 31, 2013
Filed:
May. 30, 2008
Niels Kunert, Ottenbach, DE;
Werner Geyer, Berglen, DE;
Markus Maurer, Forst, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
An internal combustion engine has a cylinder () wherein a combustion chamber () is formed which is delimited by a piston () journalled to move back and forth. At least one transfer channel () is provided which connects the crankcase () of the engine to the combustion chamber () in at least one position of the piston (). The engine has a supply channel () which opens with a supply channel inlet () at the cylinder bore (). The supply channel () is connected to the transfer channel () via at least one piston pocket () in at least one position of the piston (). In order to achieve low exhaust-gas values of the engine, the piston pocket () has a distance (a) to a lower edge () of the transfer window () which is less than the distance (b) to a lower edge () of the inlet () of the supply channel at bottom dead center of the piston (). A method for operating an engine provides that the piston pocket () is first connected to the transfer window () and then to the supply channel inlet () during the upward stroke of the piston ().