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:
Sep. 12, 2000
Filed:
Oct. 29, 1997
Manfred Kraemer, Schwieberdingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A high pressure pump which has a working chamber, which on the one hand, is connected to a low pressure circuit via a solenoid valve and on the other hand, is connected to a high pressure reservoir via a check valve. The solenoid valve has a spring-loaded closing body, which cooperates with a valve seat and together with it, constitutes the check valve. When the magnet is without current, the check function of the closing body is switched off via a valve tappet of the solenoid valve so that even with an initial working stroke of the high pressure pump, the connection to the low pressure circuit is maintained. Only with a supply of current to the solenoid valve executed during the working stroke does the valve tappet allow the closing body to contact its valve seat, whereupon the high pressure delivery then begins. The high pressure pump is designated for use in fuel injection systems of diesel motor vehicle engines.