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. 26, 2002
Filed:
May. 17, 2000
Johm F. Nally, Jr., Williamsburg, VA (US);
William A. Peterson, Jr., Smithfield, VA (US);
Siemens Automotive Corporation, Auburn Hills, MI (US);
Abstract
A fuel injector for use in a fuel injection system of an internal combustion engine is disclosed. The fuel injector includes a body, a needle, and a metering orifice. The body has a longitudinal axis and a valve seat. The valve seat has a beveled annular surface and a central opening therethrough. The central opening is formed by a generally cylindrical wall. The needle includes a first portion having a first cross sectional area and a second portion having a second cross-sectional area. The second portion includes a needle end face which extends generally perpendicular to the longitudinal axis. The needle is reciprocally located within the body along the longitudinal axis and is biased against the valve seat. The metering orifice is connected to a downstream end of the valve body. A fuel sac is generally formed by the metering orifice, the needle end face, and the cylindrical wall. A projection extends into the fuel sac, reducing a volume of the fuel sac. The projection extends from at least one of the needle end face and the metering orifice. A method of reducing unmetered fuel in a fuel injector by reducing sac volume is also disclosed.