DE102019102527A1 - Fuel distributor for an internal combustion engine and method for producing a tubular insert body for a fuel distributor - Google Patents

Abstract

The invention relates to a fuel distributor for an internal combustion engine having a housing (2) which has an elongated cavity (3), a fuel inflow opening (4) into the cavity (3) in the housing (2) and a plurality of longitudinally adjacent fuel outflow openings (5) ) are provided from the cavity (3) for one fuel injector each, a tubular insert body (12) having a longitudinal groove (17) being arranged in the cavity (3), the fuel outlet openings (5) and the fuel inlet opening (4) via the longitudinal groove (17) are in fluid communication.
It is provided that the tubular insert body (12) is formed from a tubular inner body (13) and a tubular outer body (14) arranged radially outside on the inner body (13), which are connected to one another, with the tubular outer body (14) Forming the longitudinal groove (17) a longitudinal recess (16) is formed.

Description

The invention relates to a fuel distributor for an internal combustion engine having a housing which has an elongated cavity, wherein in the housing one fuel inlet opening into the cavity and a plurality of longitudinally adjacent fuel outlet openings from the cavity are provided for each fuel injector, with a longitudinal groove in the cavity tubular insert body is arranged, wherein the fuel outlet 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.

Fuel distributors of this type are used both for diesel engines and for gasoline engines, in particular in motor vehicles. One way of reducing the fuel consumption of the internal combustion engine is to inject water into the combustion chamber in certain map areas. The admixture can take place 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 rail as small as possible so that it is possible to quickly switch between the operating modes with and without water addition.

For this purpose, is out DE 10 2014 205 179 A1 a fuel rail with the features of the preamble of claim 1 known. 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 in the introduction in that the tubular insert body is formed from a tubular inner body and a tubular outer body arranged radially outside on the inner body, which are connected to one another, with a longitudinal recess in the tubular outer body to form the longitudinal groove is trained.

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 e.g. can be done by a simple stamping process. The stamping process can be carried out easily, since the wall thickness of the outer body can be significantly less than that of a one-piece insert body according to the prior art.

In a particularly preferred embodiment, it is provided that a transverse recess running in the circumferential direction and connected to the longitudinal recess is formed in the outer body, 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 also be connected to one another 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, a longitudinal recess being made in the outer body, the outer body then being arranged on the inner body and finally the inner body and the outer body being connected to one another so that a one-piece component is created.

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

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 for soldering is preferably made in the outer body.

• 1 einen Längsschnitt durch einen Kraftstoffverteiler,
• 2 ein vergrößertes Detail der 1,
• 3 einen Schnitt gemäß der Linie III-III in 2,
• 4 eine perspektivische Darstellung eines rohrförmigen Innenkörpers,
• 5 eine perspektivische Darstellung eines rohrförmigen Außenkörpers,
• 6 eine perspektivische Darstellung des rohrförmigen Außenkörpers nach 5 aus einer anderen Richtung,
• 7 in einer perspektivischen Darstellung das Anordnen des Außenkörpers auf dem Innenkörper und
• 8 eine perspektivische Darstellung des aus dem Innenkörper und dem Außenkörper gebildeten rohrförmigen Einlegekörpers.

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

• 1 a longitudinal section through a fuel rail,
• 2nd an enlarged detail of the 1 ,
• 3rd a section along the line III-III in 2nd ,
• 4th 2 shows a perspective illustration of a tubular inner body,
• 5 1 shows a perspective illustration of a tubular outer body,
• 6 a perspective view of the tubular outer body after 5 from a different direction,
• 7 in a perspective view the arrangement of the outer body on the inner body and
• 8th a perspective view of the tubular insert body formed from the inner body and the outer body.

A fuel rail for an internal combustion engine is in 1 generally with 1 designated. Such a fuel rail 1 is also referred to as a fuel rail. The fuel rail 1 has a housing 2nd which, in the exemplary embodiment, is essentially tubular and has an elongated cavity inside 3rd having.

In the housing 2nd are a fuel inlet opening 4th in the cavity 3rd and a plurality of longitudinally adjacent fuel drain openings 5 from the cavity 3rd intended. In the area of the fuel inlet opening 4th is on the outside of the case 2nd a connecting piece 6 arranged for connection to a fuel supply line. In the area of the fuel drain openings 5 is a connection piece 7 arranged, each connecting piece 7 serves to accommodate a fuel injector, not shown. Depending on the design of an internal combustion engine, not shown, there are more or fewer connection pieces 7 with associated fuel drain openings 5 intended.

For fastening the fuel rail 1 on the internal combustion engine, not shown, there are several fastening elements along the length 8th on the outside of the case 2nd intended. The cavity 3rd of the housing 2nd is on one side with a cap 9 sealed pressure-tight and on the opposite side with a tubular closure element 10th which has a pressure sensor 11 picks up the one with the cavity 3rd communicates.

Inside the cavity 3rd of the housing 2nd of the fuel rail 1 is a tubular insert 12th arranged, which extends essentially over the entire length of the cavity 3rd extends. This insert body 12th 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 so that the outer body 14 on the inner body 13 can be pushed open with easy play ( 7 ).

The tubular inner body 13 is a simple piece of pipe, in which there is preferably an opening in one end region 15 (a hole with a diameter in the millimeter range) is provided. This opening 15 provides a fluid connection to the cavity when installed 3rd of the fuel rail 1 forth, this cavity 3rd then serves as a pressure accumulator.

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

Preferably in the tubular outer body 14 one with the longitudinal recess 16 connected cross recess 18th formed, which extends in the circumferential direction. This cross recess 18th is preferably also by punching the outer body 14 created. The cross recess 18th forms in the finished tubular insert body 12th a Cross groove 19th that are in fluid communication with the opening 15 stands, so that thereby a fluid connection between the cavity 3rd over the longitudinal groove 17th and thus to the fuel drain openings 5 as well as the fuel inlet opening 4th consists.

Furthermore, the tubular outer body 14 eg two further longitudinal cutouts 20 which are also created by stamping. These further longitudinal recesses 20 are used for solder pick-up around the tubular inner body 13 with the tubular outer body 14 connect to.

To create the tubular insert body 12th 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 will the opening 15 introduced into the tubular outer body 14 become the longitudinal recess 16 who have favourited Cross recess 18th and the other longitudinal recesses 20 brought in. Then is used to form the tubular insert body 12th the tubular outer body 14 over the tubular inner body 13 pushed and both components are positioned so that the opening 15 at the end of the cross recess 18th located. The components are then soldered to one another in this position, with solder in the further longitudinal cutouts 20 is introduced. The thus formed, one-piece tubular insert body 12th is then in the usual way in the cavity 3rd of the fuel rail 1 used.

Of course, the invention is not limited to the exemplary embodiment of the invention shown, further configurations are possible without departing from the basic idea of the invention. So the tubular inner body 13 and the tubular outer body 14 can also be connected to each other in a different way, the further longitudinal recesses being able to do so 20 possibly omitted.

Reference list

1

Fuel rail

2nd

casing

3rd

cavity

4th

Fuel inlet opening

5

Fuel outlets

6

Connecting piece

7

Connecting piece

8th

Fasteners

9

Sealing cap

10th

Closure element

11

Pressure sensor

12th

tubular insert body

13

tubular inner body

14

tubular outer body

15

opening

16

Longitudinal recess

17th

Longitudinal groove

18th

Cross recess

19th

Cross groove

20

Further longitudinal cutouts

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014205179 A1 [0005]

Claims (10)

Fuel distributor for an internal combustion engine with a housing (2) which has an elongated cavity (3), wherein in the housing (2) a fuel inflow opening (4) into the cavity (3) and a plurality of longitudinally adjacent fuel outflow openings (5) from the cavity (3) are provided for one fuel injector each, a tubular insertion body (12) having a longitudinal groove (17) being arranged in the cavity (3), the fuel outflow openings (5) and the fuel inflow opening (4) via the longitudinal groove (17) in There are fluid connections, characterized in that the tubular insert body (12) is formed from a tubular inner body (13) and a tubular outer body (14) arranged radially outside on the inner body (13), which are connected to one another, wherein in the tubular outer body (14 ) a longitudinal recess (16) is formed to form the longitudinal groove (17). Fuel distributor after Claim 1 , characterized in that in the outer body (14) a transverse recess (18) connected to the longitudinal recess (16) and extending in the circumferential direction is formed, which forms a transverse groove (19) which is in fluid communication with an opening (15) in the inner body (13 ) stands. Fuel distributor after Claim 1 or 2nd , characterized in that the outer body (14) is designed as a stamped part. Fuel distributor after Claim 1 , 2nd or 3rd , characterized in that the inner body (13) and the outer body (14) are connected to one another by a soldered connection. Fuel distributor after Claim 4 , characterized in that the outer body (14) has at least one further longitudinal recess (20) for solder absorption. Fuel distributor after Claim 1 , 2nd or 3rd , characterized in that the inner body (13) and the outer body (14) are connected to one another by a clamping and / or joining connection. Method for producing a tubular insert body for a fuel rail according to one or more of the Claims 1 to 6 characterized in 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), 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. Procedure according to Claim 7 , characterized in that, in addition to the longitudinal recess (16), a transverse recess (18) extending in the circumferential direction and connected thereto is introduced into the outer body (14). Procedure according to Claim 6 or 7 , characterized in that the outer body (14) and the inner body (13) are connected to one another by a soldered connection. Procedure according to Claim 9 , characterized in that in the outer body (14) at least one further longitudinal recess (20) is made for solder absorption.

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