WO2013037536A1

WO2013037536A1 - Pump assembly for a high-pressure injection system

Info

Publication number: WO2013037536A1
Application number: PCT/EP2012/064059
Authority: WO
Inventors: Alexander Fuchs
Original assignee: Robert Bosch Gmbh
Priority date: 2011-09-13
Filing date: 2012-07-18
Publication date: 2013-03-21
Also published as: JP2014529035A; DE102011082583A1; KR20140059802A; CN103842639A; EP2756183A1

Abstract

Disclosed is a pump assembly for a high-pressure injection system, in particular in a motor vehicle, comprising a high-pressure pump (7) and an electric pre-supply pump which consists of an electric motor and a pump and which is arranged directly on the high-pressure pump (7) or is integrated therein, the high-pressure pump (7) having a cavity (9), inside which at least part, in particular all, of the electric pre-supply pump is disposed.

Description

Description title

Pump arrangement for a high-pressure injection system

The present invention relates to a pump assembly according to the

The preamble of claim 1 and a high-pressure injection system according to the preamble of claim 10.

State of the art

Pump assemblies with an electric feed pump and a

High-pressure pump are used in particular in high-pressure injection systems in order to promote fuel for a motor vehicle with an internal combustion engine.

DE 10 2004 008 478 B4 shows a pump arrangement for a

Fuel injection system with a high-pressure fuel pump and an upstream electric fuel delivery pump, the fuel from a fuel tank to a low-pressure input of the

High-pressure fuel pump promotes, the electric fuel feed pump is regulated with respect to their flow and it is either located directly on the high-pressure fuel pump or integrated into the high-pressure fuel pump.

Disclosure of the invention

Advantages of the invention Inventive pump assembly for a high pressure injection system, in particular for a motor vehicle, comprising an electric feed pump with an electric motor and a pump and a high pressure pump, wherein the electric feed pump is disposed directly on the high pressure pump or integrated into the high pressure pump, wherein the high pressure pump

Recess or a cavity or a cavity and within the recess or the cavity or the cavity, the electric prefeed pump at least partially, in particular completely, is arranged. The

Pre-feed pump can thus be particularly space-saving and compact in

High-pressure pump to be integrated.

In a further embodiment, the recess is formed on a housing of the high-pressure pump. The housing of the high-pressure pump limits the high-pressure pump, so that the prefeed pump is easily accessible from the outside.

In an additional embodiment, the recess with a lid, in particular fluid-tight, closed.

Suitably, the lid is detachable, z. B. with a screw, attached to the high-pressure pump. The cover can thus remove, in particular unscrewed, and then the prefeed pump is accessible from the outside and can, for. B. replaced or repaired.

In a supplementary variant, an inflow channel for the electrical

Pre-feed pump formed on the lid and / or a discharge channel is formed for the electric pre-feed pump to the high-pressure pump, in particular the housing of the high-pressure pump. The subsidized by the feed pump fuel can thus be easily introduced from the outside into the lid and also can be easily fed from the outflow of the high-pressure pump through the outflow on the high-pressure pump of the fuel.

In an additional embodiment, the inflow channel and the

Outflow channel formed on two opposite sides of the recess. The inflow channel can thus be arranged, for example, on the outside of the recess, in particular the cover, so that the fuel is easy to Inflow channel can be supplied and the outflow channel is the

High pressure pump facing formed on the recess, so that the fuel can be easily fed from the outflow of the high-pressure pump.

In a variant, the pump is an internal gear pump and / or the

Recess is formed substantially cylindrical and / or the

Recess is formed in a section, in particular in a section perpendicular to a rotational axis of an impeller of the electric feed pump, circular.

In an additional embodiment, a bearing pin for an internal gear of the internal gear pump is formed on the high pressure pump, in particular the housing of the internal gear is mounted and / or on the high pressure pump, in particular the housing of the high pressure pump, is a centering ring for a stator of the electric Pre-feed pump formed on which the stator is centered and / or fixed.

The cover and / or the high-pressure pump, in particular the housing of the high-pressure pump, expediently forms a plain bearing for at least one impeller, in particular an internal and external gear, of the electric prefeed pump. Advantageously, no separate slide bearing is required thereby.

Preferably, the electric motor is integrated in the pump, in particular by permanent magnets in an impeller, in particular external gear, are installed, so that the impeller, in particular the external gear, also forms the rotor of the electric motor. The electric motor and the electric pump

Pre-feed pump thus represent non-separable units. Preferably, the electric motor of the electric feed pump of a

Power electronics supplied with electrical three-phase or alternating current, so that there is an electronic commutation. As a result, mechanical commutation elements are not required, so that due to the non-existing mechanical commutation, the feed pump with respect to vibrations and other environmental influences due to the Arrangement of the high pressure pump can occur, essential

is less sensitive than mechanical commutation.

In a supplementary variant, the pump of the electrical feed pump is a rotary vane pump.

In a further embodiment, the pump of the electric prefeed pump is an external gear pump. In an external gear pump, two gears are arranged within a housing. The gears with the teeth thus represent an impeller with conveyor elements.

In particular, the delivery rate of the electrical feed pump can be controlled and / or regulated.

In a further embodiment, the spatial distance between the electric prefeed pump and the high-pressure pump is less than 30 cm, 20 cm, 10 cm, 5 cm or 1 cm.

Preferably, a fuel filter is incorporated or integrated in the fuel line for conducting fuel from a fuel tank to the electric priming pump.

Inventive high-pressure injection system for an internal combustion engine, in particular for a motor vehicle, comprising a high-pressure pump, a high-pressure rail, an electric feed pump for conveying a fuel from a fuel tank to the high-pressure pump, wherein the electric

Pre-feed pump and the high-pressure pump as one in this

Patent application described pump assembly is formed.

In one variant, the high-pressure injection system comprises a fuel tank and at least one fuel line.

Internal combustion engine according to the invention with a high-pressure injection system, in particular for a motor vehicle, the high-pressure injection system being described as a high-pressure injection system described in this patent application trained and / or the internal combustion engine in this

Patent application described pump assembly comprises.

Suitably, an electric motor with a stator and a rotor is integrated in the internal gear pump and / or the stator is formed concentrically around the rotor.

Suitably consists of the housing of the high-pressure pump and / or the inner and / or outer gear and / or the cover at least partially, in particular completely, made of metal, for. As steel or aluminum.

Suitably, the internal gear pump is a gerotor pump.

Brief description of the drawings

Hereinafter, an embodiment of the invention below

With reference to the accompanying drawings described in more detail. It shows:

1 is a highly schematic view of a high-pressure injection system in a first embodiment,

2 is a highly schematic view of the high pressure injection system in a second embodiment,

Fig. 3 is a perspective view of an internal gear pump

and a stator,

4 is an exploded view of the internal gear pump of FIG. 3,

Fig. 5 is a view of a high-pressure pump with a recess for

the internal gear pump,

Fig. 6 is a view of a motor vehicle. Embodiments of the invention

FIG. 1 shows a pump arrangement 1 in a first exemplary embodiment of a high-pressure injection system 2 for a motor vehicle 40. An electric prefeed pump 3 conveys fuel from a fuel tank 41 through a fuel line 35. Subsequently, the fuel is conveyed from the electric prefeed pump 3 to a high pressure pump 7, wherein the prefeed pump 3 is attached to the high pressure pump 7. The high-pressure pump 7 is provided by an internal combustion engine 39 by means of a drive shaft 44

driven.

The electric prefeed pump 3 has an electric motor 4 and a pump 5 (FIGS. 3 and 4). In this case, the electric motor 4 of the pump 5 is integrated into the pump 5 and further, the electric prefeed pump 3 at the

High pressure pump 7 arranged directly. The high-pressure pump 7 delivers fuel under high pressure, for example, a pressure of 1000, 3000 or 4000 bar, through a high pressure fuel line 36 to a high pressure rail 42. From the high pressure rail 42 of the fuel under high pressure from an injector 43 a combustion chamber, not shown

Internal combustion engine 39 supplied. The non-combustion fuel is returned to the by means of a return fuel line 37

Fuel tank 41 returned. An inflow passage 28 (FIG. 4) of the electric feed pump 3 sucks fuel through a fuel line 35 from a fuel tank 41, and through an outflow passage 29 (FIG. 5) the fuel is passed through an internal fuel passage (not shown) of the pump assembly 1 of the high pressure pump 7 fed.

In the fuel line 35 from the fuel tank 41 to the electric

Pre-feed pump 3 is a fuel filter 38 (Fig. 1) installed, d. H. of the

Fuel filter 38 is arranged on the suction side of the electric prefeed pump 3. Deviating from this, the fuel filter 38 can also be arranged on the pressure side (FIG. 2) to the electric prefeed pump 3, ie hydraulically between the electric prefeed pump 3 and the high-pressure pump 7. This advantageously allows the fuel line 35 from the fuel tank 41 to the electric prefeed pump 3 cost be trained because they must withstand any overpressure. The electric motor 4 (Fig. 3 and 4) of the electric Pre-feed pump 3 is operated with three-phase or alternating current and is controllable in power and / or adjustable. The three-phase current or alternating current for the electric motor 4 is provided by a power electronics, not shown, from a DC voltage network of a vehicle electrical system of the motor vehicle 40. The electric prefeed pump 3 is thus an electronically pumped prefeed pump 3rd

The electric prefeed pump 3 does not have a separate housing, but the electric prefeed pump 3 is installed in a recess 9 or a cavity 9 or a cavity 9 on a housing 30 of the high-pressure pump 7, so that the housing 30 of the high-pressure pump 7, the housing of the electric prefeed pump 3 forms (Fig. 5).

Within the housing 30, the pump 5 as internal gear pump 6 and gerotor pump 26 and the electric motor 4 are arranged. The electric motor 4 has a stator 13 with coils 14 as electromagnets 15 and a

Soft iron core 45 as a soft magnetic core 32, which is formed as a laminated core 33. Within the stator 13, the pump 5 is as

Internal gear pump 6 with an internal gear 22 with an internal gear 23 and an external gear 24 with an external gear 25 positioned. The inner and outer gear 22, 24 thus represents a gear 20 and an impeller 18 and the inner and outer toothed ring 23, 25 have teeth 21 as conveying elements 19. The external gear 24 performs a rotational movement about one

Rotation axis 27 and the internal gear 22 performs a rotational movement about an axis of rotation, not shown, to the illustrated

Rotation axis offset and aligned in parallel, since the inner and

Outer gear 22, 24 are aligned eccentrically to each other. Between the inner and outer gear 22, 24, a working space 51 is formed. In the external gear 24 permanent magnets 17 are installed, so that the

Outer gear 24 and a rotor 16 of the electric motor 4 forms. Of the

Electric motor 4 is thus integrated into the pump 5 and vice versa. The

Electromagnets 15 of the stator 13 are alternately energized, so that due to the resulting magnetic field to the electromagnet 15, the rotor 16 and the external gear 24 is set in a rotational movement about an axis of rotation 27. The electric feed pump 3 is within the substantially

cylindrical recess 9 (Fig. 5). In Fig. 5, the electric feed pump 3 is not shown. The recess 9 is closed fluid-tight by a cover 8. For this purpose, the cover 8 is screwed with three screws 34 to the housing 30 of the high-pressure pump 7. The lid 8 has

Holes 10 on and on the housing 30 are also three

Housing bores 31 incorporated with a thread. The three screws 34 are thus inserted into the holes 10 and then the screws 34 can be screwed into the housing bores 31, so that a screw 46 is formed. With a seal, not shown between the cover 8 and the housing 30, the recess 9 is sealed with the electric prefeed pump 3 fluid-tight with respect to the environment.

The housing 30 of the high pressure pump 7 has at the recess 9 on a bearing pin 47 and a centering ring 48. With the bearing pin 47, the internal gear 22 is mounted. At the centering ring 48, the stator 13 is centered or fixed. Since the external gear 24 is mounted on the stator 13, the external gear 24 is thus indirectly supported or held by the centering ring 48 on the centering ring 48.

Furthermore, the housing 30 at the recess 9 to the outflow channel 29. Through the outflow channel 29 of the electric prefeed pump 3, the funded by the electric prefeed pump 3 fuel through a fuel passage, not shown, the high-pressure pump 7 is supplied. The

High-pressure pump 7 has a cylinder head 49 in which the

High-pressure fuel line 36 opens. In the lid 10 of the inflow channel 28 (Fig. 4) is incorporated. The inflow channel 28 opens within the lid 10 in an intake manifold 50 for the fuel. At the intake manifold 50, the fuel line 35 is connected. The housing 30 of the high pressure pump 7 and the cover 8 serves as a plain bearing 11 or thrust bearing 11 for the inner and outer gear 22, 24th

Overall, significant advantages are associated with the pump assembly 1 according to the invention. The electric prefeed pump 3 is integrated in the high pressure pump 7 by the prefeed pump 3 is installed in a recess 9 on the housing 30 of the high pressure pump. This is in advantageously no additional housing for the feed pump 3 is required and the prefeed pump 3 is compact and space-saving installed in the high-pressure pump 7.

Claims

claims

1. pump arrangement (1) for a high-pressure injection system (2),

in particular for a motor vehicle (40), comprising an electric prefeed pump (3) with an electric motor (4) and a pump (5) and a high-pressure pump (7), wherein the electric prefeed pump (3) is arranged directly on the high-pressure pump (7) or in the high-pressure pump (7) is integrated, characterized in that the high-pressure pump (7) has a recess (9) and within the recess (9), the electric prefeed pump (3) at least partially, in particular completely, is arranged.

Pump arrangement according to one or more of the preceding claims, characterized in that the recess (9) on a housing (30) of the high-pressure pump (7) is formed.

3. Pump arrangement according to one or more of the preceding claims, characterized in that the recess (9) with a lid (8), in particular fluid-tight, is closed.

4. Pump arrangement according to claim 3, characterized in that the cover (8) releasably, for. B. with a screw (46), to the high pressure pump (7) is attached.

5. Pump arrangement according to claim 3 or 4, characterized in that an inflow channel (28) for the electric prefeed pump (3) on the

Cover (8) is formed

and or

a discharge channel (29) for the electric prefeed pump (3) on the high pressure pump (7), in particular the housing (30) of

High pressure pump (7), is formed.

6. Pump arrangement according to claim 5, characterized in that the inflow channel (28) and the outflow channel (29) to two

opposite sides of the recess (9) are formed.

7. Pump arrangement according to one or more of the preceding claims, characterized in that the pump (5) is an internal gear pump (6)

and or

the recess (9) is substantially cylindrical and / or the recess (9) in a section, in particular in a section perpendicular to a rotation axis (27) of an impeller (18) of the electric prefeed pump (3), is circular.

8. Pump arrangement according to one or more of the preceding claims, characterized in that on the high-pressure pump (7), in particular the housing (30) of the high-pressure pump (7), a bearing pin (47) for an internal gear (22) of the internal gear pump (6). is formed on which the internal gear (22) is mounted

and or

on the high pressure pump (7), in particular the housing (30) of the high pressure pump (7), a centering ring (48) for a stator (13) of the electric prefeed pump (3) is formed on which the stator (13) centered and / or fixed is.

9. Pump arrangement according to one or more of claims 6 to 8, characterized in that the cover (8) and / or the high-pressure pump (7), in particular the housing (30) of the high-pressure pump (7), a plain bearing (11) for at least an impeller (18), in particular an inner and outer gear (22, 24), the electric prefeed pump (3).

10. High-pressure injection system (2) for an internal combustion engine (39),

in particular for a motor vehicle (40)

a high pressure pump (7),

a high pressure rail (42),

- An electric prefeed pump (3) for conveying a fuel from a fuel tank (41) to the high pressure pump (7), characterized in that the electric feed pump (3) and the high pressure pump (7) as a Pump arrangement (1) is designed according to one or more of the preceding claims.