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:
Jun. 11, 2002
Filed:
Mar. 01, 2001
Peter Linsbauer, Remshalden, DE;
Lars Bergmann, Welzheim, DE;
Heiko Rosskamp, Adelberg, DE;
Reinhard Gerhardy, Korb, DE;
Andreas Stihl AG & Co., Waiblingen, DE;
Abstract
The invention relates to a two-stroke engine for a portable handheld work apparatus such as a motor chain saw. The combustion chamber ( ), which is configured in a cylinder ( ), is delimited by a piston ( ) which drives a crankshaft ( ) rotatably journalled in a crankcase ( ). The crankcase ( ) is connected to the combustion chamber ( ) via a transfer channel ( ). A first end ( ) of the transfer channel ( ) opens into the combustion chamber ( ) via an entry window ( ) lying in the cylinder wall ( ); whereas, the second end ( ) of this transfer channel ( ) is open toward the crankcase ( ). The transfer channel ( ) is connected between its ends ( ) to an air channel ( a, b) via a check valve ( ). The air channel ( a, b) supplies essentially fuel-free gas via a throttle ( ) having an adjustable throttle element ( ). A mixture-preparation device ( ) is provided for the air/fuel mixture downstream of an air filter ( ) in the flow direction of the combustion air. The air/fuel mixture is supplied via an inlet ( ) to the crankcase ( ). In order to meter clean air to the air channels in a controlled manner, an adjustable throttle element ( ) is mounted in a throttle channel ( ) of an independent throttle housing ( ) and the throttle channel ( ) is connected upstream of the throttle element to the clean space ( ) of the air filter ( ) connected ahead of the mixture-preparation device ( ).