US 4,394,973 AGranted

Injection valve

AssigneeRobert Bosch GmbH

InventorsRudolf Sauer, Wolfgang Kienzle, Werner Paschke, Waldemar Hans

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Abstract

A fuel injection valve is proposed for fuel injection systems of internal combustion engines, which serves to supply fuel into the intake tube of the engine. The injection valve includes a movable valve element which cooperates with a fixed valve seat, downstream of which are provided horizontal fuel guidance bores which discharge tangentially into a spin chamber. The spin chamber is disposed so that it widens conically in the flow direction. The fuel guidance bores simultaneously serve as metering bores. The spin chamber causes an axial speed component to be imparted to the fuel entering via the fuel guidance bores. As a result, the dwell time of the metered fuel within the spin chamber is short, and even in the case of quite short injection pulses, the fuel is still sufficiently well prepared.

Claims4

Dependent claims

An injection valve for fuel injection systems of internal combustion engines including a movable valve element associated with a fixed valve seat in a valve seat body,

said valve seat body having an annular wall recess downstream of said valve seat,
a nozzle means downstream of said valve seat having horizontal fuel guidance bores therein,
said nozzle means having an end portion having a plurality of flat sides,
said end portion protruding into said recess,
and intermediate chambers formed between the sides of the end protrusion and the wall of said recess,
said horizontal fuel guidance bores extending from said intermediate chambers to a spin chamber in said nozzle means,
said spin chamber having a frusto-conical interior wall,
said fuel guidance bores extending tangentially of said spin chamber interior wall whereby fuel is tangentially discharged into said spin chamber,
the interior wall of said spin chamber diverging outwardly in the direction of flow whereby a fuel stream emerges from the spin chamber in a conical configuration.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/249,297Filed 30 Mar 1981
Priority: DE 30130073 Apr 1980
Granted: 26 Jul 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F02M 61/162
Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14: means to impart a whirling motion to fuel…
F02M 51/065
The valve being a short body, e.g. sphere or cube: the valve being spherical or partly spherical
F02M 51/08
Injectors peculiar thereto with means directly operating the valve needle: specially for low-pressure fuel-injection
F02M 61/1806
Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for: characterised by the arrangement of…

Family

No related US applications are recorded in the indexed filing history.

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