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:
Jun. 08, 1982
Filed:
Feb. 09, 1979
Odon Kopse, Stuttgart, DE;
Kurt Ziesche, Remseck, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To provide for gradual admission of servo fluid to then operate a fuel injection pump to pus injected fuel out through the nozzle, a control valve element is used which has a displacement or deflection-vs.-servo fluid admission characteristic which provides for hydraulic choking of pressurized servo fluid being admitted to a servo cylinder chamber upon initiation of a fuel injection event, and thereby provide for gradual build-up of injection pressure of the fuel. By suitable shaping of the choke ducts, the admission of fuel can be first of a small quantity, then interrupted, and then of a selected, for example full servo fluid quantity; this can be accomplished by forming an intermediate land on a control slider or rotary valve element with a connecting passage forming a choke; or gradually decreasing choking effect of fluid admission, for example by forming relatively movable control surfaces at an inclination so that, upon initial opening of a fluid path, the inclined surface will provide for a constricted passage-way which then gradually opens to full admission of pressurized servo fluid.