Internal-combustion engines – Charge forming device – Fuel flow regulation between the pump and the charge-forming...
Patent
1994-02-14
1995-03-14
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Fuel flow regulation between the pump and the charge-forming...
137574, F02M 3710, B60K 1503
Patent
active
053968727
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel tank according to the generic part of the main claim. In a fuel tank which is already known from DE-PS 39 15 185, two jet pumps supplied by the fuel return line are arranged in a fuel tank having two partial tanks which are situated at a distance from one another and connected with one another at a distance above the base of the fuel tank. To ensure a reliable emptying of the two partial tanks, one jet pump is located in each partial tank. Both jet pumps fill a tank or vessel which is arranged in one partial tank, a fuel delivery unit sucking the fuel out of this vessel. However, this is ensured only under normal operating conditions.
ADVANTAGES OF THE INVENTION
In contrast to the prior art, the fuel tank according to the invention with the characterizing features of the main claim has the advantage that it ensures a reliable supply of fuel to the fuel delivery unit even under disadvantageous operating conditions.
Such operating conditions can occur, for example, when the tank is almost empty and the motor vehicle must travel a relatively long distance downhill or uphill. Such unfavorable conditions can also occur when the motor vehicle must travel a relatively long curve when the tank is almost empty. Under such circumstances, the remaining fuel slops against one edge region of the fuel tank so that the jet pumps may no longer be able to access and deliver fuel and the vessel is quickly emptied. Such a process can have fatal consequences.
Advantageous further developments and improvements of the fuel tank set forth in the main claim are made possible by the steps contained in the subclaims.
DRAWING
Embodiment examples of the invention are shown in the drawing and described in more detail in the following description.
FIG. 1 shows a basic view (not in scale) of a fuel supply apparatus for the internal combustion engine of a motor vehicle with fuel supply tank, shown in section, a vessel arranged in the latter, shown in section, a fuel delivery unit, and a line system connecting the tank with the internal combustion engine;
FIG. 2 shows a partial section through the vessel along line II--II in FIG. 1 in enlarged scale;
FIG. 3 shows a top view of the fuel supply tank, shown in reduced scale, with the upper wall of the tank removed;
FIG. 4 shows a partial section according to FIG. 2 through a modified construction of the vessel.
DESCRIPTION OF THE EMBODIMENT EXAMPLES
A fuel supply tank 10 shown in FIG. 1 is provided in its interior with a vessel 12 whose base 14 resists on the bottom 16 of the fuel supply tank 10. A fuel delivery unit 18 is arranged in the vessel 12. The fuel delivery unit 18 sucks fuel out of the interior of the vessel 12 and delivers it, via a supply line 20, to an internal combustion engine 22 of a motor vehicle (not shown in more detail). Since the delivery unit delivers more fuel to the internal combustion engine 22 than can be consumed by the latter, a certain excess amount of fuel is returned to the fuel supply tank 10 via a return line 24. The return line 22 is divided within via a return line 24. The return line 22 is divided within the fuel supply tank 10 into a supply line 26 for jet pumps, which will be described in more detail in the following, and a bypass 28 which leads directly into the vessel 12 via a relief valve 30. As will further be seen from FIG. 1, three fuel nozzles 32, 34, 36 associated in each instance with a jet pump 38, 40, 42 are constructed at the end portion of the supply line 26. Mixing tubes 44, 46 and 48 associated with the fuel nozzles 32, 34, 36 are constructed in one side wall 50 of the vessel 12. The fuel nozzles 32, 34, 36 are also constructed in side wall 50. Only a fragment of the side wall 50 is shown in section in FIG. 1. This fragment reveals the upright arrangement of the jet pumps 38, 40, 42 whose mixing tubes 44, 46, 48 open out at the upper edge area of the side wall 50. The wall 50 of the vessel 12 thus forms a structural member at which the three jet pumps 38, 40, 42 are arranged or integrat
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patent: 5070849 (1991-12-01), Rich et al.
patent: 5133324 (1992-07-01), Michiaki
patent: 5170764 (1992-12-01), Tuckey
patent: 5289810 (1994-03-01), Bauer et al.
Geyer Gerhard
Kling Martin
Ruger Ernst
Moulis Thomas N.
Robert & Bosch GmbH
Striker Michael J.
Wolfe Willis R.
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