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. 10, 2002
Filed:
Mar. 01, 2001
Heiko Rosskamp, Adelberg, DE;
Michael Raffenberg, Fellbach, DE;
Andreas Stihl AG & Co., Waiblingen, DE;
Abstract
The invention relates to a two-stroke engine in a portable handheld work apparatus such as a motor chain saw. A combustion chamber ( ) is formed in a cylinder ( ) and is delimited by a piston ( ). The piston ( ) drives a crankshaft ( ) via a connecting rod ( ). The crankshaft is journalled in a crankcase ( ). Air is supplied to the combustion chamber ( ) via a first outlet-near transfer channel ( ); whereas, the air/fuel mixture, which is needed for operation, flows in via a second outlet-remote transfer channel ( ) from the crankcase ( ). The constructive volume of the outlet-near transfer channel ( ) is designed to be approximately 20% to 60% of the volumetric total air input of the engine ( ) in order to achieve a complete charge of the combustion chamber while having low scavenging losses.