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. 28, 2004
Filed:
Oct. 22, 2002
Uwe Finke, Weil der Stadt, DE;
Tibor Bauer, Kornwestheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A solenoid valve valve part for controlling a fuel injector in a fuel injection system has a valve needle, the open and closed positions of which may be controlled by the solenoid valve valve part. The solenoid valve valve part has a valve ball which rests on a valve seat and which lifts up from the valve seat when current flows through the solenoid valve valve part. The valve seat is in hydraulic connection with the fuel injector via a borehole. When the valve ball lifts up from the valve seat, a pressure medium such as high-pressure fuel flows through the borehole into a pressure relief chamber in the solenoid valve valve part. In the further progression this causes the fuel injector to open. To prevent the formation of cavitation bubbles and the damage thus caused, the borehole includes, at least in part, one or more sections having a cross section which continuously expands in the direction of the valve seat. A separation in flow brought about by sharp transition edges, which may cause cavitation bubbles, is thus counteracted.