Fuel distributor

Abstract

A fuel distributor which has a pressure accumulator pipe for receiving pressurized fuel where the pressure accumulator pipe has a forged main body with a longitudinal cavity. At least one connector flange is configured in one piece from the same material on the main body. The connector flange has an injector connector with a connecting duct to the longitudinal cavity. A cup-shaped injector receptacle is joined to the injector connector. The injector receptacle is a single-piece deep-drawn part or a single-piece extruded part or a single-piece turn-milled part, and is connected to the injector connector by way of a fuel-tight join, or by way of brazing technology.

Claims

1. A fuel distributor, comprising: a pressure accumulator pipe for receiving pressurized fuel, the pressure accumulator pipe comprising: a forged main body having a longitudinal cavity, and at least one connector flange being configured in one piece from a same material on the forged main body, wherein the at least one connector flange has an injector connector and a mounting base; and an injector receptacle joined to the injector connector, wherein the injector receptacle is a single-piece deep-drawn part, the injector connector comprises a connection piece body and a pin, the pin is configured on the connection piece body via a step, and the injector receptacle has an end which receives and engages around the pin peripherally, and the injector receptacle is connected to the injector connector by way of a fuel-tight join.

2. The fuel distributor according to claim 1, wherein the injector receptacle is joined to the injector connector by way of brazing technology.

3. The fuel distributor according to claim 1, wherein the injector receptacle has a first longitudinal axis, the longitudinal cavity has a second longitudinal axis, and the first longitudinal axis is offset laterally with respect to the second longitudinal axis.

4. The fuel distributor according to claim 1, wherein the injector receptacle has a first longitudinal axis, the longitudinal cavity has a second longitudinal axis, and the first longitudinal axis of the injector receptacle and the second longitudinal axis of the longitudinal cavity intersect.

5. The fuel distributor according to claim 1, wherein the injector receptacle has a hollow-cylindrical length portion having the end which receives and engages around the pin peripherally, and a collar turned over toward an outside and being configured at another end of the hollow-cylindrical length portion which faces away from the injector connector.

6. The fuel distributor according to claim 5, wherein the mounting base has a through bore for fixing the fuel distributor in an engine compartment.

7. The fuel distributor according to claim 1, further comprising a deep-drawn or extruded end piece that closes one end of the longitudinal cavity.

8. The fuel distributor according to claim 1, further comprising at least one sensor receptacle configured in one piece from the same material on the forged main body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The disclosure is described in further detail in the following text on the basis of exemplary embodiments which are shown in the drawings, in which:

(2) FIG. 1 shows a fuel distributor according to the disclosure in a perspective view,

(3) FIG. 2 shows the fuel distributor according to FIG. 1 in another perspective,

(4) FIG. 3 shows the fuel distributor in a plan view,

(5) FIG. 4 shows the fuel distributor in a side view,

(6) FIG. 5 shows a section through the illustration of FIG. 4 along the line A-A,

(7) FIG. 6 shows a detail from a further embodiment of a fuel distributor in a perspective illustration,

(8) FIG. 7 shows the detail of the fuel distributor in accordance with FIG. 6 in a side view,

(9) FIG. 8 shows a section through the illustration of FIG. 7 along the line B-B,

(10) FIG. 9 shows a detail from a further embodiment of a fuel distributor in a perspective illustration,

(11) FIG. 10 shows the detail of the fuel distributor in accordance with FIG. 9 in a side view,

(12) FIG. 11 shows a section through the illustration of FIG. 10 along the line C-C,

(13) FIG. 12 shows a detail from a further embodiment of a fuel distributor in a perspective illustration,

(14) FIG. 13 shows the detail of the fuel distributor in accordance with FIG. 12 in a side view, and

(15) FIG. 14 shows a section through the illustration of FIG. 13 along the line D-D.

(16) Elements and element components which correspond to one another are provided with the same reference signs in FIGS. 1 to 14.

DETAILED DESCRIPTION

(17) FIGS. 1 to 5 show a first embodiment of a fuel distributor 1 according to the disclosure.

(18) The fuel distributor 1 belongs to the accumulator system of an internal combustion engine. The pressure generation and the fuel injection are decoupled from one another in the case of accumulator injection systems of this type. A separate high pressure pump generates pressure continuously. Said pressure which is built up independently of the injection sequence is permanently available in the fuel distributor 1.

(19) The fuel distributor 1 comprises a pressure accumulator pipe 2 with a pump-side high pressure fuel connector 3 and a plurality of injector connectors 4. The statically compressed fuel is stored in the pressure accumulator pipe 2 and is provided in a manner which is distributed via the injector connectors 4 to the injectors (not shown here) of a cylinder bank. A pressure sensor connector 5 is provided for the connection of a pressure sensor.

(20) The pressure accumulator pipe 2 has a forged main body 6. Connector flanges 7 are configured in one piece from the same material on the main body 6 using forging technology. After the forging, the main body 6 is machined. The injector connectors 4 are configured on the connector flanges 7. Each connector flange 7 has a connection piece body 8. The connection piece body 8 projects downward in the installed position with respect to the main body 6 of the pressure accumulator pipe 2. An injector connector 4 has a receiving bore 9 in the connector flange 7, which receiving bore 9 is made in the connection piece body 8.

(21) A longitudinal cavity 10 is made in the main body 6 by means of deep hole drilling. The longitudinal cavity 10 has a longitudinal axis L1.

(22) The longitudinal cavity 10 and the injector connector 4 are connected in a fuel-conducting manner by way of a connecting duct 12 which runs from the bottom 11 of the receiving bore 9 transversely in the direction of the longitudinal cavity 10.

(23) The injector connector 4 receives the injector connector-side end 13 of an injector receptacle 14. The injector receptacle 14 is a single-piece deep-drawn part or a single-piece extruded part, for example made from a stainless steel alloy. An injector receptacle 14 can also be configured as a single-piece turn-milled part.

(24) The injector receptacle 14 is of cup-like configuration and is inserted into the cylindrical receiving bore 9. The injector receptacle 14 has a hollow-cylindrical length portion 15. The latter serves to receive the upper part of an injector. A peripheral collar 17 which is turned over toward the outside is configured at that end 16 of the length portion 15 which faces away from the injector connector 4. The collar 17 forms a lower contact face or supporting face on the injector receptacle 14.

(25) That end 13 of the injector receptacle 14 which faces the injector connector 4 is open. The injector receptacle 14 is inserted into the receiving bore 9 and is prefixed there. This can take place using pressing technology of by means of tack welding or other prefixing means. After the prefixing, solder is applied, and the injector receptacle 14 is joined in an integrally joined and fuel-tight manner in the injector connector 4. The brazing process takes place in a furnace brazing system, in the case of which all brazing operations on the fuel distributor 1 are carried out in one furnace pass.

(26) The longitudinal axis L2 which extends through the injector receptacle 14 is offset laterally with respect to the longitudinal axis L1 which extends through the longitudinal cavity 10. The connector flange 7 and the injector connector 4 are thus arranged laterally on a longitudinal side 18 of the pressure accumulator pipe 2, in relation to the installed position of the fuel distributor 1.

(27) It can be seen, furthermore, that in each case one mounting base 19 is configured on the connector flange 7. This has taken place in the course of the production of the main body 6 using forging technology. The mounting base 19 or the mounting bases 19 has/have a through bore 20. The latter serves to guide through mounting elements, e.g., fastening screws, by means of which the fuel distributor 1 can be fixed in an engine compartment. In that exemplary embodiment of the fuel distributor 1 which is shown here, the mounting bases 19 configure pedestals which extend between the pressure accumulator pipe 2 and the mounting point. One alternative (not shown here) provides that additional spacer elements, for example sleeves, are mounted on the mounting base 19. The spacer elements are joined in an integrally joined manner to the mounting base 19. It can be seen that the injector connectors 4 and the mounting bases 19 are configured on the connector flange 7. The connector flange 7 comprises in each case one mounting base 19 and one injector connector 4 formed from the same material.

(28) In the case of the fuel distributor 1 which is shown in FIGS. 6 to 8, the longitudinal axis L2 which runs through the injector receptacle 14 and the longitudinal axis L1 of the cavity 10 intersect. The connector flange 7 has a connection piece body 8. A pin 22 is configured on the connection piece body 8 via a step 21. The injector receptacle 14 is placed with its injector receptacle-side end 13 onto the pin 22. The end 13 engages around the pin 22 peripherally. The injector receptacle 14 is joined to the connector flange 7. The connecting duct 12 extends in the direction of the longitudinal axis L1 of the injector receptacle 14 through the injector connector 4 as far as into the longitudinal cavity 10. In relation to the mounted position of the fuel distributor 1, the connecting duct 12 runs in a vertically directed manner through the pin 22 and the connection piece body 8 of the connector flange 7.

(29) The injector receptacle 14 is a deep-drawn part or an extruded part, and is configured as a cup which is open toward the top. The injector receptacle 14 is pressed onto the cylindrical pin 22 of the connection piece body 8. The prefixing of the injector receptacle 14 thus takes place by way of a press fit. Prefixing by way of tack welding is also conceivable here. The final fuel-tight join takes place by way of a brazing process in a continuous furnace.

(30) In the case of the fuel distributor 1 which is shown in FIGS. 9 to 11, the injector connector 4 is configured in the connector flange 7. The connector flange 7 has a connection piece body 8 with a cylindrical receiving bore 9. The injector receptacle 14 is inserted and joined with its injector connector-side end 13 into/in said receiving bore 9. At the end 13, the injector receptacle 14 has a bottom 23 with a through opening 24. The injector receptacle 14 is also a deep-drawn part or an extruded part in this exemplary embodiment.

(31) The fuel distributor 1 in accordance with the illustration of FIGS. 12 to 14 has a connector flange 7 with an injector connector 4. The injector connector 4 is configured in a connection piece body 8 of the connector flange 7. A receiving bore 9 is made in the free end of the connection piece body 8. Said receiving bore 9 continues in a stepped manner into the connecting duct 12. The injector receptacle 14 is a deep-drawn part or an extruded part. The injector receptacle 14 has a central length portion 15 with a peripheral collar 17 at the end 16. At the injector-side end 13, the injector receptacle 14 has a bottom 23 with a passage 25. The passage 25 delimits the through opening 26 peripherally. The injector receptacle 14 is pressed by way of the passage 25 into the receiving bore 9, and is joined there in an integrally joined manner. This takes place by way of brazing, but can also be configured by way of welding.

(32) The foregoing description of some embodiments of the disclosure has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure to the precise form disclosed, and modifications and variations are possible in light of the above teachings. The specifically described embodiments explain the principles and practical applications to enable one ordinarily skilled in the art to utilize various embodiments and with various modifications as are suited to the particular use contemplated. It should be understood that various changes, substitutions and alterations can be made hereto without departing from the spirit and scope of the disclosure.