# US 5,699,773 A · Arrangement for pumping fuel out of a supply tank to an internal combustion engine

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- Number: US 5,699,773 A
- Document ID: US5699773A
- Status: Granted
- Kind: A
- Application number: 08/776,705
- Filed: 1997-02-12
- Granted: 1997-12-23
- Earliest claimed: 1995-06-13
- Assignees: Robert Bosch GmbH
- Inventors: Stephan Kleppner; Ansgar Seitz
- Web page: https://patentgrep.com/patent/US5699773A

## CPC

- B60K 15/077: with means modifying or controlling distribution or motion of fuel, e.g. to prevent noise, surge, splash or fuel starvation
- F02M 37/025: {Feeding by means of a liquid fuel-driven jet pump (jet pumps per se F04F)}
- B60K 2015/03105: {with supplementary interior tanks inside the fuel tank}
- B60K 2015/03236: {characterised by special filters, the mounting thereof}
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

An arrangement for pumping fuel out of a supply tank to an internal combustion engine having an electrically driven pumping unit which is disposed in a ram pot inserted into the supply tank. The ram pot is filled with fuel from the tank by means of a jet pump provided on its bottom; the intake opening of the jet pump is preceded by a filter that is formed by at least one ring of teeth axially protruding from the bottom of the ram pot, which enclose an intake chamber into which the intake opening of the jet pump protrudes.

## Claims

### Claim 1

An arrangement for pumping fuel out of a supply tank (1) to an internal combustion engine (49), comprising an electrically driven pumping unit (11), which has an intake connector stub (33) and an outlet opening (34) that communicates at least indirectly with a supply line (47) to the engine (49), the pumping unit (11) is disposed in a ram pot (3), the ram pot is retained by a bottom (8) on a bottom (9) of the supply tank (1) by means of a resilient element (7), the ram pot can be filled with fuel from the tank (1) by means of a jet pump (61), an intake opening (65) of the jet pump (61) is preceded by a filter, the filter is formed by at least one ring of formed-protrusions (67), which protrude axially from the bottom (8) of the ram pot (3), to a bottom of the supply tank, a flow cross section is provided between said protrusion which forms a gap filter, protrusions in combination with said ram pot housing enclose an aspiration chamber (69) from which an intake opening (65) of the jet pump (61) aspirates fuel.

### Claim 2 (depends on 1)

The arrangement of claim 1, in which a plurality of rings of formed-on protrusions (67) form the filter, and radially successively located protrusions (67) of said filter are offset from one another thereby, forming a labyrinth seal with gap filter elements.

### Claim 3 (depends on 1)

The arrangement of claim 1, in which the formed-on protrusions (67) of the filter ring are embodied as teeth, whose end faces rest sealingly on the bottom (9) of the tank supply (1), and whose transitions between individual side faces are sharp-edged.

### Claim 4 (depends on 1)

The arrangement of claim 1, in which the ram pot (3) and the filter preceding the jet pump (61) are embodied integrally.

### Claim 5 (depends on 1)

The arrangement of claim 1, in which the jet pump (61) is disposed in a suitably shaped receiving opening (63) in the bottom (8) of the ram pot (3).

### Claim 6 (depends on 1)

The arrangement of claim 1, in which the jet pump (61) is driven by a return quantity of fuel flowing from the engine (49).

### Claim 7 (depends on 1)

The arrangement of claim 1, in which an intake connector stub (33) of the pumping unit (11) is preceded by a filter disk (29), which closes off an antechamber (27) that forms a suction chamber of the pumping unit from the interior of the ram pot (3).

### Claim 8 (depends on 1)

The arrangement of claim 1, in which between an outlet opening (34) of the pumping unit (11) and the supply line (47) to the engine (49), a further, annular filter (21) is provided, said annular filter is inserted into a cylindrical housing (13) for receiving the pumping unit (11).

### Claim 9 (depends on 1)

The arrangement of claim 1, in which the resilient element that presses the ram pot (3) against the bottom (9) of the tank (1) is embodied by a compression spring (7), which is fastened between a cap of the ram pot (5) in an upper housing wall of the tank (1), and a portion of the supply tank.

### Claim 10 (depends on 2)

The arrangement of claim 2, in which the adjacent protrusions (67) of the individual coaxial filter rings are joined to one another by webs (73) in such a way that they form an Q-shaped profile pointing in the circumferential direction of the filter ring.