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:
Nov. 28, 2000
Filed:
Jan. 14, 1999
Georg Becker, Schwaikheim, DE;
Jurgen Haberlein, Murrhardt, DE;
Markus Husges, Bergen/Lehnenberg, DE;
Andreas Stihl AG & Co., Waiblingen, DE;
Abstract
The invention is directed to an internal combustion engine for a portable handheld work apparatus. The engine includes a cylinder having a combustion chamber and a piston rotates a crankshaft via a connecting rod. The crankshaft is mounted in a crankcase and is connected to a cam drive. The cam drive drives a valve control for an inlet valve and an outlet valve. The inlet valve controls an overflow channel which leads from the crankcase to the combustion chamber, and the outlet valve controls an outlet channel branching away from the combustion chamber. Furthermore, an intake channel, which opens into the crankcase, and a housing, which is separate from the crankcase, are provided for the cam drive. In order to provide a lubrication for the cam drive which is independent of position, the cam drive is configured as a gear wheel drive and an oil sump is provided in the housing of the cam drive. At least one gear wheel of the cam drive is so arranged that it dips at least partially into the oil sump and pumps oil for lubricating the movable parts of the engine.