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:
Mar. 08, 2011
Filed:
Jun. 15, 2006
Olaf Enke, Columbia, SC (US);
Olaf Enke, Columbia, SC (US);
Siemens Diesel Systems Technology, Blythewood, SC (US);
Abstract
A dampening stop pin that reduces a needle velocity at the time when the needle valve of a fuel injector is about to be seated in a closed position. A gap between a bottom surface of the stop-pin flange and a sealing seat of a nozzle is provided to compress the fuel trapped therein to form a fuel cushion that dampens the closing motion of the needle. Moreover, a diametrical clearance between an outer circumferential edge of the flange and an inner surface of a needle spring cage must be sized to prevent undesired high pressure from building up in the gap by venting a quantity of compressed fuel while still permitting the fuel cushion to dampen the closing force of the needle.