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:
Jan. 14, 1992
Filed:
Dec. 18, 1987
Udo Hafner, Lorch, DE;
Roberts Bosch GmbH, Stuttgart, DE;
Abstract
A hydraulic circuit for a fuel injection system having fuel injection valves, in which even under hot start conditions in an internal combustion engine, it is assured that the engine will start and continue to operate reliably. The hydraulic circuit is embodied such that the fuel pumped by a fuel feed pump into a fuel supply line reaches an annular fuel inflow chamber of a valve socket of a first fuel injection valve, and from there can flow through the fuel injection valve and emerges into an annular fuel return groove in the valve socket, from which it can flow via a connection to the annular fuel inflow chamber of the next fuel injection valve in succession. The fuel returns upwardly so that any air in the fuel will go upwardly with the fuel.