Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1995-11-15
1998-07-28
Hepperle, Stephen M.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
123463, G05D 1608, F16K 2700
Patent
active
057850801
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a pressure-regulating valve for a fuel supply system of an internal combustion engine. There is already a known pressure-regulating valve (DE 28 16 479 A1) in which the valve housing is formed from deep-drawn sheet-metal parts and the top of the valve cap against which the compression spring acting in the closing direction of the pressure-regulating valve rests is deformed to set the force of said compression spring. It is a disadvantage here that the deformation of the sheet metal to produce the valve housing is very involved and hence entails high costs.
ADVANTAGES OF THE INVENTION
In contrast, the pressure-regulating valve according to the invention has the advantage that it allows precise setting of the spring force despite the use of plastic as the material for the cap.
Advantageous developments and improvements of the pressure-regulating valve specified herein are made possible by the measures presented hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are illustrated in simplified form in the drawing and explained in greater detail in the following description.
FIG. 1 shows a schematic illustration of a fuel supply system of an internal combustion engine,
FIG. 2 shows a first exemplary embodiment of a pressure-regulating valve according to the invention, and
FIG. 3 shows a second exemplary embodiment of a pressure-regulating valve according to the invention.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
In FIG. 1, 1 denotes a fuel tank in which is arranged a fuel pump 2 that is driven, for example, by an electric motor and pumps fuel into a fuel line 3. The fuel line 3 opens into a "fuel rail" 4, from which fuel enters injection valves 6 inserted into the fuel rail 4. The injection valves 6 are each inserted by their injection ends into a respective individual intake pipe of a cylinder of a mixture-compressing, applied-ignition internal combustion engine 7 and spray fuel in the immediate vicinity of the inlet valves of the individual cylinders. Arranged between the fuel pump 2 and the fuel line 3 is a holding body 8 by means of which the fuel delivered by the fuel pump flows to the fuel line 3 and which serves to hold a pressure-regulating valve 9. The holding body 8 is preferably situated directly on the fuel tank 1 or, together with the pressure-regulating valve 9, within the fuel tank, allowing fuel discharged by the pressure-regulating valve 9 to flow back directly into the fuel tank 1 via a return connection 10. The fuel supply system described corresponds to the so-called returnless system, in which the excess fuel which is delivered by the fuel pump 2 but not injected by the injection valves 6 is returned to the fuel tank 1 directly downstream of the fuel pump, via the pressure-regulating valve 9. The advantage of this arrangement is that no additional fuel lines are required to return the fuel which is not injected at the injection valves from the fuel rail 4 to the fuel tank 1, these lines being exposed to the risk of damage. It is also advantageous that the pressure-regulating valve 9 is arranged in a protected location in the fuel tank 1 and that the fuel returned to the fuel tank via the pressure-regulating valve is not subject to the heat in the engine compartment of the motor vehicle and thus remains cool, thereby reducing unwanted heating of the fuel delivered by the fuel pump and hence the risk that vapor bubbles will occur in the fuel supply system.
FIG. 2 shows a holding body 8, which can be manufactured from a metallic or nonmetallic material such as plastic. The holding body 8 has an inflow stub 13 with an inflow passage 14 and an outflow stub 15 with an outflow passage 16. Likewise formed in the holding body is a cylindrical location opening 17 which runs transversely to the inflow passage 14 and the outflow passage 16 and at which the inflow passage 14 ends and the outflow passage 16 begins. The location opening 17 is of stepped design and has a first step section 18 which has a larger diameter than a s
REFERENCES:
patent: 4284039 (1981-08-01), Bellicardi et al.
patent: 4505296 (1985-03-01), Field
patent: 4883088 (1989-11-01), Herbst
patent: 5275203 (1994-01-01), Robinson
Greigg Edwin E.
Greigg Ronald E.
Hepperle Stephen M.
Robert & Bosch GmbH
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