Fuel Pump For Internal Combustion Engines

Inactive Publication Date: 2011-09-15
THIELERT AIRCRAFT ENGINES GMBH VERTR D D INSOLVENZVERWALTER DR BRUNO M KUBLER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]The invention is therefore based on the object of designing the prefeed pump connected upstream of the high-pressure pump in such a manner that even when using fuel with reduced lubricating power a long lifespan is guaranteed.

Problems solved by technology

The reliability and the maximum operating duration of the fuel pumps are particularly limited in that they are lubricated with the delivered fuel and the bearings and sliding surfaces are under more or less load corresponding to the lubricating power of the fuel.
Since the diesel engines employed in aircraft are operated with a kerosene-based aircraft fuel with significantly lower lubricating power compared with diesel fuel, the lifespan of the fuel pumps in this case is particularly low.
The prefeed pump designed in this manner only has a very short lifespan when used for a diesel engine operated with aircraft fuel since the driveshaft and the driven pump gear and consequently also the pump housing are subjected to high wear and the prefeed pump has to be replaced completely even after a short operating time.

Method used

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  • Fuel Pump For Internal Combustion Engines
  • Fuel Pump For Internal Combustion Engines

Examples

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Embodiment Construction

[0014]The prefeed pump shown in a disassembled state in FIG. 1 is designed as gear pump and comprises a pump housing 1, in which a driven first pump gear 2 and a second pump gear 3 are mounted. In addition, a driven driveshaft 4 is mounted in the pump housing 1. A coupling disc 5 moulded onto the driveshaft 4 has the shape of a convex, regular, in this case, triangular polygon, i.e. of a triangle with three curved lateral faces of the same length and the same size internal angles. The coupling disc 5 engages in a recess 6 formed in the driven pump gear 2 whose contour shaped as polygon corresponds to the contour of the coupling disc 5. Subject to the intermediate connection of a sealing ring 8 the pump housing 1 is closed-off through a housing cover 9 which is fastened by means of cheese-head screws.

[0015]The polygonal outer contour of the coupling disc 5 and the recess 6 provided in the driven pump gear 2 is shown in more detail in the FIGS. 2 and 3. The regular triangular polygon ...

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Abstract

A fuel pump is disclosed, especially a prefeed pump for feeding aircraft fuel to the high pressure pump, wherein the form-fit connection between the drive shaft (4) and the driven impeller (2) is produced by a regular, convex, triangular polygonal contour having rounded-off lateral faces and corner faces, the drive shaft and the impeller being provided with the polygonal contour. In this manner, the wear resulting from the poor lubricating power of the kerosene-based aircraft fuel can be reduced and the service life of the fuel pump can be increased.

Description

TECHNICAL FIELD[0001]The invention relates to a fuel pump, especially a prefeed pump for internal combustion engines comprising a gear pump with a pump impeller driven via a driveshaft, more preferably for diesel engines operated with aircraft fuel.BACKGROUND[0002]The fuel feed to the combustion chamber of aircraft engines operated in common-rail technology using aircraft fuel takes place from a tank via a prefeed pump and a high-pressure pump to a common distribution pipe (rail) connected to the individual cylinders, as is well known. Since a failure of a fuel pump invariably results in engine stoppage, an extremely high reliability is demanded particularly with aircraft engines. The reliability and the maximum operating duration of the fuel pumps are particularly limited in that they are lubricated with the delivered fuel and the bearings and sliding surfaces are under more or less load corresponding to the lubricating power of the fuel. The lifespan of the fuel pumps is thus deci...

Claims

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Application Information

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IPC IPC(8): F04C2/18F04C15/00F04C29/02
CPCF02M37/04F04C2/18F04C15/0073F16D2001/102F04C2240/20F04C2240/60F16D1/101F04C15/0076
InventorRUDOLPH, CARSTEN
OwnerTHIELERT AIRCRAFT ENGINES GMBH VERTR D D INSOLVENZVERWALTER DR BRUNO M KUBLER