WO2020157217A1

WO2020157217A1 - Fuel distributor for an internal combustion engine

Info

Publication number: WO2020157217A1
Application number: PCT/EP2020/052323
Authority: WO
Inventors: Martin Braun
Original assignee: Winkelmann Powertrain Components Gmbh & Co. Kg
Priority date: 2019-02-01
Filing date: 2020-01-30
Publication date: 2020-08-06
Also published as: DE102019102527B4; DE102019102527A1

Abstract

The invention relates to a fuel distributor for an internal combustion engine, comprising a housing (2) which has an elongate cavity (3). A fuel inlet opening (4) into the cavity (3) and a plurality of fuel outlet openings (5) out of the cavity (3) for respective fuel injectors are provided in the housing (2), the fuel outlet openings being adjacent in the longitudinal direction. A tubular insert body (12) having a longitudinal groove (17) is arranged in the cavity (3). The fuel outlet openings (5) and the fuel inlet opening (4) are fluidically connected by means of the longitudinal groove (17). The tubular insert body (12) is formed from a tubular inner body (13) and a tubular outer body (14) that is arranged radially outside on the inner body (13), the inner body and the outer body being connected to one another, a longitudinal cut-out (16) being formed in the tubular outer body (14) in order to form the longitudinal groove (17).

Description

Fuel distributor for an internal combustion engine

The invention relates to a fuel distributor for an internal combustion engine with a housing which has an elongated cavity, wherein in the housing a fuel inflow opening in the cavity and a plurality of longitudinally adjacent fuel outflow openings from the cavity are provided for each fuel injector, with a longitudinal groove in the cavity aufwei sender tubular insert body is arranged, wherein the fuel drain openings and the fuel inlet opening are in fluid communication via the longitudinal groove.

Furthermore, the invention relates to a method for producing a tubular insert body for a fuel distributor of the type described above.

Fuel distributors for internal combustion engines are known in a variety of configurations. As a rule, the pressure generation and the fuel injection are decoupled from one another. A fuel pump continuously generates pressure. This pressure, which is built up regardless of the injection sequence, is permanently available in the fuel rail, which acts as a reservoir. For this purpose, the compressed fuel is stored in a fuel rail and distributed to the injectors or injectors of a cylinder bank of the internal combustion engine.

Such fuel distributors are used both for diesel engines and for Otto engines, especially in motor vehicles. Injection is one way of reducing the fuel consumption of the internal combustion engine of water in the combustion chamber in certain map areas. The admixture can be done by injecting the water directly into the combustion chamber, as a separate injection or as an injection with a fuel / water mixture. In the latter case, it is advantageous to keep the high-pressure volume of the fuel distributor as small as possible so that it is possible to quickly switch between the operating modes with and without water mixing.

For this purpose, a fuel distributor with the features of the preamble of claim 1 is known from DE 10 2014 205 179 A1. In this fuel distributor, a tubular insert body is arranged in the elongated cavity of the housing and has a longitudinal groove for connecting a fuel inlet opening to the fuel outlet openings, each of which is assigned a fuel injector.

However, the production of this tubular insert body is complex since the at least one longitudinal groove has to be milled into the tubular body.

The object of the invention is to simplify the manufacture of the tubular insert body in such a fuel distributor.

This object is achieved according to the invention in a fuel distributor of the type mentioned at the outset in that the tubular insert body is formed from a tubular inner body and a radially outside on the inner body of ordered tubular outer bodies, which are connected to one another, the tubular outer body forming the longitudinal groove a longitudinal recess is formed.

The tubular insert body for the fuel distributor is thus formed by two tubular components which are connected to one another. Both components are simple pieces of pipe, the tubular outer body only having to be provided with a longitudinal recess to form the longitudinal groove, which can be done, for example, by a simple stamping process. The stamping process is easy through feasible, since the wall thickness of the outer body can be significantly less than with a one-piece insert body according to the prior art.

In a particularly preferred embodiment it is provided that in the outer body a transverse recess running in the circumferential direction is formed which is connected to the longitudinal recess and which forms a transverse groove which is in fluid communication with an opening in the inner body. This configuration is preferably provided when the cavity enclosed by the inner body serves as a storage volume. This cavity is in fluid communication with the transverse groove and thus the longitudinal groove through the opening.

In order to simplify the manufacture of the tubular outer body, it is preferably designed as a stamped part.

According to a first preferred embodiment, it is provided that the inner body and the outer body are connected to one another by a solder connection. In this embodiment, it is particularly preferably provided that the outer body has at least one further longitudinal recess for solder absorption.

Alternatively, the inner and outer bodies can be connected to each other in other ways, e.g. through a clamp and / or joint connection.

The invention also proposes a method for producing a tubular insert body, in which a tubular inner body and a tubular outer body to be arranged radially outside of the inner body are provided, with a longitudinal recess being made in the outer body, where the outer body then fits onto the inner body Inner body is arranged and finally the inner body and the outer body are connected to each other, so that a one-piece component is formed.

If the cavity of the inner body is to be used as a pressure accumulator volume, it is also preferably provided that in addition to the outer body Longitudinal recess, a transverse recess connected to it and running in the circumferential direction is introduced.

Finally, it is provided that the outer body and the inner body are connected to one another by a solder connection.

For this purpose, at least one further longitudinal recess is preferably introduced into the outer body for solder absorption.

The invention is explained in more detail below using the drawing as an example. This shows in

1 shows a longitudinal section through a fuel distributor,

2 is an enlarged detail of FIG. 1,

3 shows a section along the line III-III in FIG. 2,

4 is a perspective view of a tubular inner body,

5 is a perspective view of a tubular outer body,

Fig. 6 is a perspective view of the tubular outer body according to

5 from a different direction,

Fig. 7 in a perspective view the arrangement of the outer body on the inner body and

Fig. 8 is a perspective view of the inner body and the

Outer body formed tubular insert body. A fuel distributor for an internal combustion engine is generally designated 1 in FIG. 1. Such a fuel rail 1 is also referred to as a fuel rail. The fuel rail 1 has a housing 2 which, in the exemplary embodiment, is essentially tubular and has an elongated cavity 3 in the interior.

In the housing 2, a fuel inflow opening 4 in the cavity 3 and several re longitudinally adjacent fuel outflow openings 5 are provided from the cavity 3. In the area of the fuel inflow opening 4, a connecting piece 6 for connection to a fuel supply line is arranged on the outside of the housing 2. In the area of the fuel drain openings 5, a connection piece 7 is arranged, each connection piece 7 for receiving a fuel, not shown! serves. Depending on the design of an internal combustion engine, not shown, more or fewer connection ports 7 with associated fuel drain openings 5 are provided.

To attach the fuel rail 1 to the combustion engine, not shown, a plurality of fastening elements 8 are provided along the length te on the outer side of the housing 2. The cavity 3 of the housing 2 is closed in a pressure-tight manner on one side with a closure cap 9 and on the opposite side with a tubular closure element 10 which receives a pressure sensor 11 which is in communication with the cavity 3.

Within the cavity 3 of the housing 2 of the fuel distributor 1, a tubular insert body 12 is arranged, which extends substantially over the entire length of the cavity 3 ge. This insert body 12 is formed according to the invention from two parts, namely a tubular inner body

13 and a tubular outer body 14. The outer diameter of the tubular inner body 13 and the inner diameter of the outer body

14 matched to one another in such a way that the outer body 14 can be pushed onto the inner body 13 with a slight play (FIG. 7). The tubular inner body 13 is a simple piece of pipe, in which an opening 15 (a bore with a diameter in the millimeter range) is preferably provided in one end region. This opening 15 creates a fluid connection to the cavity 3 of the fuel rail 1 in the installed state, this cavity 3 then serves as a pressure accumulator.

The tubular outer body 14 has a longitudinal recess 16, which is preferably formed by stamping before. This longitudinal recess 16 forms in the finished tubular insert body 12, a longitudinal groove 18, via which the fuel outlet openings 5 and the fuel inlet opening 4 are in fluid communication.

Preferably, a transverse recess 18 connected to the longitudinal recess 16 is formed in the tubular outer body 14 and extends in the circumferential direction. This transverse recess 18 is preferably also created by punching the outer body 14. The transverse recess 18 forms in the finished tube-shaped insert body 12, a transverse groove 19, which is in fluid communication with the opening 15, so that there is a fluid connection between the cavity 3 via the longitudinal groove 17 and thus to the fuel outlet openings 5 and the fuel inflow opening 4.

Furthermore, the tubular outer body 14 has e.g. two further longitudinal recesses gene 20, which are also created by punching. These further longitudinal recesses 20 are used for soldering in order to connect the tubular inner body 13 to the tubular outer body 14.

To create the tubular insert body 12, two pieces of pipe are thus provided, namely the tubular inner body 13 and the tubular outer body 14. In the tubular inner body 13, the opening 15 is introduced, in the tubular outer body 14, the longitudinal recess 16, the transverse recess 18 and introduced the further longitudinal recesses 20. On- closing to form the tubular insert body 12, the tubular outer body 14 is pushed over the tubular inner body 13 and both components are positioned so that the opening 15 is 18 at the end of the Queraus. The components are then soldered to one another in this position, solder being introduced into the further longitudinal cutouts 20. The tubular insert body 12 thus formed, which is then in one piece, is then inserted into the cavity 3 of the fuel distributor 1 in a customary manner.

Of course, the invention is not limited to the illustrated embodiment of the invention, further embodiments are possible without leaving the Grundge thank the invention. For example, the tubular inner body 13 and the tubular outer body 14 can also be connected to one another in a different manner, the further longitudinal cutouts 20 possibly being omitted.

Reference list:

1 F u r t e ve rte i I e r

2 housings

3 cavity

4 fuel inlet opening

5 fuel drain holes

6 connecting pieces

7 connecting pieces

8 fasteners

9 sealing cap

10 closure element

11 pressure sensor

12 tubular insert body

13 tubular inner body

14 tubular outer body

15 opening

16 longitudinal recess

17 longitudinal groove

18 cross recess

19 transverse groove

20 Further longitudinal cutouts

Claims

Claims:

1. Fuel distributor for an internal combustion engine with a housing (2) which has an elongated cavity (3), wherein in the housing (2) has a fuel supply opening (4) in the cavity (3) and a plurality of fuel drain openings (5) arranged adjacent in the longitudinal direction. from the cavity (3) for each egg NEN fuel injector are provided, in the cavity (3) a longitudinal groove (17) having a tubular insert body (12) is arranged, the fuel drain openings (5) and the fuel inflow opening (4) via the longitudinal groove (17) are in fluid communication,

characterized,

that the tubular insert body (12) is formed from a tubular inner body (13) and a radially outside on the inner body (13) arranged tubular outer body (14), which are connected to each other, where in the tubular outer body (14) to form the Longitudinal groove (17) a longitudinal recess (16) is formed.

2. Fuel distributor according to claim 1,

characterized,

that in the outer body (14) with the longitudinal recess (16) connected in the circumferential direction transverse recess (18) is formed, which forms a transverse groove (19) which is in fluid communication with an opening (15) in the inner body by (13).

3. Fuel distributor according to claim 1 or 2,

characterized,

that the outer body (14) is designed as a stamped part.

4. Fuel distributor according to claim 1, 2 or 3,

characterized,

that the inner body (13) and the outer body (14) are connected to one another by a solder connection.

5. Fuel distributor according to claim 4,

characterized,

that the outer body (14) has at least one further longitudinal recess (20) for solder absorption.

6. Fuel distributor according to claim 1, 2 or 3,

characterized,

that the inner body (13) and the outer body (14) are connected to one another by a clamping and / or joining connection.

7. A method for producing a tubular insert body for a fuel distributor according to one or more of claims 1 to 6,

characterized,

that a tubular inner body (13) and a tubular outer body (14) to be arranged radially outside on the inner body (13) are provided, a longitudinal recess (16) being made in the outer body (14), where the outer body (14) is arranged on the inner body (13) and finally the inner body (13) and the outer body (14) are connected to one another.

8. The method according to claim 7,

characterized,

that in the outer body (14) in addition to the longitudinal recess (16) is connected to the water connected in the circumferential direction transverse recess (18) is introduced.

9. The method according to claim 6 or 7,

characterized,

that the outer body (14) and the inner body (13) are connected to one another by a solder connection.

10. The method according to claim 9,

characterized,

that at least one further longitudinal recess (20) is inserted into the outer body (14) for solder absorption.