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. 30, 2008
Filed:
Sep. 25, 2003
Par Martinsson, Jonkoping, SE;
Mikael Bergman, Banhergd, SE;
Reine Gustafsson, Jonkoping, SE;
Husqvarna AB, Huskvarna, SE;
Abstract
A crankcase scavenged two-stroke engine () comprises a cylinder () including scavenging ports () and at least one exhaust port, a piston (), a connecting rod (), a crankshaft () and a generally sealed crankcase (). The crankcase inducts a fuel/air mixture and is connected to the scavenging ports () by means of transfer ducts () which, as the piston () is travelling from a lower position towards a higher position, are inducting pure air let in from connecting ports () near the scavenging ports () in the cylinder (). The transfer duct () volume is less than 20% of a volume swept by the piston () during an entire revolution of the crankshaft (). Recesses () are formed in an outer periphery of the piston (), said recesses () co-operating with the connecting ports () in the cylinder wall for controlling the filling of the transfer ducts () with air. An inlet tube () in the cylinder wall supplies the air/fuel mixture, said inlet tube () being connected to the crankcase () and covered by the piston () as the piston () is in the lower position, and open to the crankcase () as the piston () is in the higher position.