Fluent material handling – with receiver or receiver coacting mea – Filling means with receiver or receiver coacting means – Supply means carried receiver flow control opening means
Reexamination Certificate
2000-03-27
2001-03-20
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
Filling means with receiver or receiver coacting means
Supply means carried receiver flow control opening means
C141S285000, C220S086200, C137S590000
Reexamination Certificate
active
06202715
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a feeding device for fuel.
The feeding devices for fuel are known, in which the fuel is fed from a fuel tank, for example to an injection system of a combustion engine of a motor vehicle.
One of such feeding devices is disclosed for example in the German patent document DE 44 44 854 A1. In this feeding device the feeding pump is driven by an electric motor and the fuel flows from the feeding pipe through a prefilter, and after the feeding pump is guided under the feeding pressure through a main filter. These components are arranged in a filter cup with a removable cover. The electric motor and the feeding pump are located in a central chamber and the main filter is located in a ring chamber which is concentric to the central chamber.
Connectors for tubular connections or pressure hoses are provided on the cover of the filter cup of this known arrangement. Fuel is guided through them to a connection change of the fuel tank. The feeding device therefore forms a complete feeding module which can be directly assembled in the fuel tank. The fuel is aspirated in the fuel tank under the feeding module and can be supplied above from the connection flange on the cover of the fuel tank through a feeding conduit to the combustion engine.
In such feeding devices there is a problem that in the case of low tank level and during curved travels of the vehicle, when the fuel is sloshed back from the feeding pump, a sufficient quantity of fuel is not available to guarantee a continuous feeding to the combustion engine. In the prior art this problem is solved for example by an additional reservoir which is arranged around the feeding pump and in some cases can be filled by an additional suction jet pump. In this situation the structural space which is available in the vehicle has a critical value for forming a sufficiently large reservoir to be available for this purpose.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a feeding device for fuel, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated, in a feeding device for fuel in which, in addition to a first reservoir, at least one further reservoir is available, which is offset from the first reservoir and coupled with it through a connecting conduit. Thereby an increased reservoir volume can be provided by the greater variability in suitable geometrical conditions in the tank.
This arrangement can be realized in a simple way, when the geodatic height of the reservoir is higher than the geodatic height of the connecting conduit, so that an exchange of fuel through the connection conduits is performed in accordance with the principle of the communicating pipes. It is therefore guaranteed that the reservoirs which are arranged in different regions of the tanks spaced far from one another, are hydraulically connected with one another so as to operate as a single reservoir.
When a so-called multi-chamber or saddle tank is utilized in many cases due to an optimal use of the critical space for the tank, it is guaranteed with the invention that a hydraulic exchange of the fuel through the connecting conduit is performed between the at least two reservoirs through a saddle-shaped raised part.
It is possible to provide the required filling device of the reservoirs on each of reservoirs. Preferably however an arrangement is selected in which the filling pipe of the tank for the fuel is provided on the closest reservoir with a filling valve or flap.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 2719583 (1955-10-01), Malick
patent: 4703771 (1987-11-01), Mimura
patent: 4951699 (1990-08-01), Lipman
patent: 44 44 854 A1 (1996-06-01), None
Braun Hans-Peter
Frank Kurt
Schreckenberger Dieter
Douglas Steven O.
Robert & Bosch GmbH
Striker Michael J.
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