WO2012150072A1

WO2012150072A1 - Fuel distributor

Info

Publication number: WO2012150072A1
Application number: PCT/EP2012/054513
Authority: WO
Inventors: Markus Feigl; Holger UHRIG; Helmut Schneider; Nikolaus Hautmann; Dietmar Uhlenbrock; Martin GOEHNER
Original assignee: Robert Bosch Gmbh
Priority date: 2011-05-02
Filing date: 2012-03-15
Publication date: 2012-11-08
Also published as: PL2705246T3; EP2705246B1; CN103502627B; EP2705246A1; RU2013153129A; DE102011075052A1; CN103502627A; RU2585673C2

Abstract

The invention relates to a fuel distributor (1) that is used in particular for fuel injection systems of mixture-compressing spark ignition internal combustion engines. Said fuel distributor comprises a distributor piece (2), several valve cups (3 to 6) arranged on the distributor piece (2), and a tensioning part (10). The tensioning part (10) is supported on the distributor piece (20) and the valve cups (3 to 6). In addition, the tensioning part (10) is preloaded and applies the preload to the valve cups (3 to 6) against the distributor piece (2).

Description

description

title

Brenn substance distributor state of the art

The invention relates to a fuel distributor, in particular for

Fuel injection systems of mixture-compressing, spark-ignited

Internal combustion engine is used. Specifically, the invention relates to the field of as

Medium pressure systems designed fuel injection systems.

In fuel injection systems of motor vehicles, it is conceivable that a

Fuel rail is used, which is designed for high pressure applications made of steel or aluminum. As a result, a compressive strength for pressures of, for example, 20 MPa (200 bar) can be achieved. Such a high-pressure steel rail can be produced as a soldering rail. Here, a steel tube serves as a base to which the individual components, such as e.g. Caps, screw-on, a high pressure port and interfaces to the injection valve, so-called cups, are soldered. These

Design is associated with high production costs. Specifically, a drawn pipe must be cut to size. Furthermore, the ends must be processed and appropriate outlets drilled. Furthermore, the cups and holders must be made from post-processed steel castings, small assembly assemblies or deep-drawn parts. The connection caps can be configured as turned or deep-drawn parts, while the connections can be configured as turned parts. Before the final soldering process, the individual attachments must be fixed. In sum, this results in a very costly manufacturing process with many

Steps.

In addition, fuel rail assemblies may be used for low pressure applications at 0.3 MPa (3 bar) to 0.5 MPa (5 bar) for related applications. Of the

However, the scope of such fuel rail for low pressure applications is limited to this low pressure range. Disclosure of the invention

The fuel distributor according to the invention with the features of claim 1 has the advantage that a fuel distributor with comparatively low production costs can be created, which may be suitable in particular for a medium pressure.

The measures listed in the dependent claims are advantageous

Further developments of the fuel distributor specified in claim 1 possible. The fuel distributor can be designed particularly low by the individual components, in particular the valve cups, are attached with an advantageous connection technology to a distributor to be produced inexpensively. As a result, the fuel distributor can be produced inexpensively while achieving the desired strength and pressure resistance. The secure connection of the juxtaposed items under operating conditions and the attachment of the

Fuel distributor to an engine block or the like can be done via the clamping part. The clamping part may in this case be formed in an advantageous manner as a punched and bent part. Furthermore, the clamping part can be configured in an advantageous manner as a clamping plate. Such a clamping plate secures over the bias of the elastic deformation of the geometry of the secure connection of the assembled items. Here, a simple assembly technique can be used in which the items to the

Distributor be arranged and then fixed on the clamping part to the manifold. Advantageously, the distributor piece is formed from at least one plastic. Furthermore, it is advantageous that the valve cups are formed from at least one plastic and optionally as an injection molded part. Specifically, the manifold may be tubular

Distributor, that is designed as a manifold, be configured. Such a tubular

Distributor can be designed, for example, as a manufactured in the extrusion thick-walled plastic raw r. In order to achieve a sufficient compressive strength, in this case preferably several fabric layers with different winding angles are incorporated. This thick-walled plastic pipe is deflected to the desired length and provided with mounting holes for the valve cups. Thus, the manifold can be made particularly inexpensive and easily adapted to the particular application, in particular the desired pressure range.

The clamping part can be formed in an advantageous manner from a non-alloy steel sheet. As corrosion protection here is optionally a surface coating of Steel sheet possible. Thus, the clamping part can be made particularly inexpensive. The clamping part then secures the joined assembly parts at operating pressure and allows the attachment of the fuel distributor on the engine block or the like. It is also advantageous that the valve cups each have a hollow mandrel which is inserted into a provided for the respective valve cup bore of the manifold. Here, it is also advantageous that a sealing ring is provided for each valve cup, which bears against an outer side of the manifold and the hollow mandrel of the respective valve cup surrounds, and that due to the bias of the clamping part of the sealing ring between the outside of the manifold and the respective valve cup a bias voltage is applied. The bias of the sealing ring is not necessarily equal to the bias that exerts the clamping part on the valve cup. In particular, an annular receiving groove may be provided on the valve cup, in which the sealing ring is at least partially inserted in order to compress the sealing ring and thus the

Limit the preload of the sealing ring. In this way, on the one hand, a defined pretensioning of the sealing ring is made possible so that an overstress is avoided and the sealing effect can be maintained over the service life. In addition, the bias of the clamping member initially, that is, during assembly, then be set correspondingly large, so that even with decreasing over time bias of the clamping part, the required for the sealing ring bias is still guaranteed. Thus, the sealing effect between the individual valve cups and the manifold can be chosen so large that the required operating pressure can be reliably achieved. A corresponding configuration, in particular with regard to the hollow mandrel and / or the sealing ring, can also be used in other attachments, in particular a closure plug and a connection piece.

It is advantageous that the valve cups each have a channel which extends from the respective hollow mandrel to a valve receptacle and that the channel is angled at least approximately 90 °. This results in a space-saving

Embodiment in which in particular a distance between the manifold and an engine block can be optimized.

It is also advantageous that an end plug is provided, which closes a tubular ausgestaltetes distributor piece at one end, and that the clamping part the end plug against the tubular manifold with a bias

applied. Thus, the end plug can also be fixed on the clamping piece on the manifold. Furthermore, the required sealing effect on the clamping part can be ensured. The stopper can hereby in appropriate Sealed via a sealing ring which is disposed between the end plug and the tubular manifold. Accordingly, it is advantageous that a connection piece is provided, which is arranged at one end of the tubular distributor piece, and that the clamping part, the connection piece against the tubular

Distributor loaded with a bias. This can also be the

Fitting be fixed on the clamping part of the tubular manifold. About the bias of the clamping part in this case the desired sealing effect is achieved. In this case, a sealing ring may also be provided. Brief description of the drawings

Preferred embodiments of the invention are described in the following description with reference to the accompanying drawings, in which corresponding

Elements are provided with matching reference numerals, explained in more detail. It shows:

1 shows a fuel distributor in a schematic, partial sectional view according to an embodiment of the invention.

Fig. 2 shows the fuel distributor shown in Fig. 1 in a schematic

Sectional view along the section line designated II and

Fig. 3 shows the fuel distributor shown in Fig. 1 in a schematic, excerpted sectional view of the designated III direction of view. Embodiments of the invention

Fig. 1 shows an embodiment of a fuel distributor 1 of the invention in a schematic, partial sectional view. The fuel distributor 1 can be configured in particular in the form of a fuel distributor strip 1. Of the

Fuel distributor 1 is particularly suitable for fuel injection systems of

mixture-compression, spark-ignited internal combustion engines. In particular, the fuel distributor 1 is suitable for a medium-pressure system. The medium pressure for such a

Medium pressure system can be in the range of 3 MPa to 10 MPa or 30 bar to 100 bar. In particular, the mean pressure may be in the range of 5 MPa to 7 MPa or 50 bar to 70 bar. However, the fuel distributor 1 according to the invention is also suitable for other applications. The fuel distributor 1 is designed in several pieces. Here, the fuel distributor 1 has a tubular distributor piece 2 and a plurality of valve cups 3, 4, 5, 6 arranged on the distributor piece 2. In this embodiment, four valve cups 3 to 6 are provided. Depending on the application, two or more such valve cups 3 to 6 may generally be provided here. Due to the multi-piece design of the

Fuel distributor 1 in this case a modular design is possible, so that, inter alia, a plurality of valve cups can be produced and the required number of such valve cups in the assembly of the respective fuel distributor 1 is used.

The tubular distributor piece 2 of the fuel distributor 1 is formed from a plastic. In this case, the production preferably takes place by means of a plurality of fabric layers, which are incorporated at different winding angles. In this way, a thick-walled plastic pipe can be produced, from which the tubular distributor piece 2 is produced in the desired length by cutting to length. The valve cups 3 to 6 are preferably formed as injection molded parts from a plastic.

The fuel distributor 1 also has a clamping part 10. The clamping part 10 is preferably formed from a steel sheet, in particular a non-alloy steel sheet. Here, the clamping member 10 may be formed as a punched and bent part. As a result, the clamping part 10 can be inexpensively formed as a clamping plate 10. Depending on

Use case, the clamping part 10, however, also a coating and

optionally also have a Kunststoffbesch direction. The clamping part 10 is then formed substantially as a clamping plate 10.

The embodiment of the fuel distributor 1 of the exemplary embodiment is described below also with reference to FIGS. 2 and 3.

Fig. 2 shows the fuel distributor 1 shown in Fig. 1 in a schematic

Sectional view along the section line designated II. Fig. 3 shows the fuel distributor 1 shown in Fig. 1 in a schematic, excerpts

Sectional view from the direction of view designated III. The clamping part 10 has cuts 1 1, 12, of which only the cuts 1 1, 12 are marked for simplicity of illustration. Through the cuts 1 1, 12 it is possible that

Fixing portions 13, of which only the fixing portion 13 is shown, are formed by bending. Such a fastening portion 13 may, for example, have a fastening bore 14, which in an installed position below the

tubular manifold 2 is located. As a result, an attachment of the clamping part 10 at an internal combustion engine or the like possible. In addition, the incisions 1 1, 12 allow the forming of clamping angles 15, 16, 17, 18, which engage behind the individual cups 3 to 6 viewed from the manifold 2 from. In addition, the clamping part 10 has a curved, cup-shaped receptacle 19. The receptacle 19 serves to receive the tubular distributor piece 2 and engages around this on an outer surface 20 of the tubular distributor piece 2.

During assembly, the clamping part 10 is slightly bent, so that the clamping angle 15 to 18, the individual valve cups 3 to 6 act against the tubular manifold 2 with a bias. The clamping member 10 is then biased.

The valve cups 3 to 6 each have a hollow mandrel 21, 22. The hollow mandrels 21, 22 extend through bores 23, 24 of the tubular distributor piece 2. During assembly, the valve cups 3 to 6 are inserted with their hollow mandrels 21, 22 into the bores 23, 24 of the distributor piece 2.

In addition, a sealing ring 25, 26 is provided for each valve cup 3 to 6. The sealing rings 25, 26 are in the mounted state on the outer surface (outer side) 20 of the tubular manifold 2 on. Furthermore, the sealing rings 25, 26 enclose the respective hollow mandrel 21, 22 of the valve cups 3 to 6. By the bias of the clamping member 10 are the

Sealing rings 25, 26 between the outer side 20 of the manifold 2 and the respective valve cup 3 to 6 applied with a bias. The bias voltage, with which the sealing rings 25, 26 respectively acted upon, may be less than is possible by the bias of the clamping member 10. As a result, an overload, in particular overpressure, the sealing rings 25, 26 is avoided. In this embodiment, 3 to 6 annular grooves 27, 28 are provided for this purpose on the valve cups. In these annular grooves 27, 28 of the valve cups 5 to 6, the sealing rings 25, 26 are at least partially inserted. During assembly, then the bias of the sealing rings 25, 26. The structural design of the grooves 27, 28 in this case is the maximum stress of the sealing rings 25, 26, that is, the generated

Bias, which acts on the sealing rings 25, 26 limited.

The valve cups 3 to 6 each have a channel 29, 30. Here, the channel 29 extends through the hollow mandrel 21 and is also angled at least approximately at 90 °. As a result, an axis 31 of a valve seat 32 of the valve cup 5 is at least approximately parallel to a fastening axis 33, which is in this

Embodiment is determined by the mounting hole 14. This results a compact design. Accordingly, the channel 30 of the valve cup 6 is angled at least approximately 90 °.

The fuel distributor 1 also has an end plug 40 and a

Connector 41 on. The stopper 40 is attached to one end 42 of the tubular manifold 2, while the fitting 41 is attached to an end 43 remote from the end 42 of the tubular manifold 2. As a result, the tubular distributor piece 2 can be produced particularly inexpensively. Namely, after cutting the tubular manifold 2 to length and reworking the ends 42, 43 if necessary, the end plug 40 and the fitting 41 can be mounted. At a suitable time, preferably after cutting, the bores 23, 24 are mounted for the individual valve cups 3 to 6. The end plug 40 closes the end 42 of the tubular manifold 2.

Here, a sealing ring 44 is provided between the end plug 40 and the end 42 of the manifold 2, which improves the seal. In addition, the

End stop 40 fixed by a bracket 45 of the clamping member 10 and applied to the end 42 of the manifold 2 with a certain bias. In addition, also between the connecting piece 41 and the end 43 of the manifold 2 a

Sealing ring 46 is provided which improves the seal at the end 43. The

Connecting piece 41 is in this case acted upon by a bracket 47 of the clamping member 10 with a certain bias against the end 43 of the manifold 2. The closure plug 40 is preferably designed as a free-falling injection molded part 40. The selected arrangement of a sealing ring groove 48 into which the sealing ring 44 is inserted, or of the sealing ring 44, ensures that there is no degree of separation in the sealing area. For weight reduction and to achieve the same wall thicknesses as possible, the end plug 40 may have a blind hole in the radial guide. The sealing ring 44 is preferably designed as an O-ring 44.

The connecting piece 41 may be formed as an automatic turning part made of corrosion-resistant metal. Here, a standardized high-pressure connection can be selected. The sealing ring 46 is also preferably designed as an O-ring 46.

In addition, the valve cups 3 to 6 can be designed as freely falling injection molded parts 3 to 6. In the region of the grooves 27, 28 serving as sealing grooves 27, 28 preferably no mold separation is provided. In addition, they are preferable given uniform wall thicknesses. The sealing rings 25, 26 are preferably also designed as O-rings 25, 26.

The assembly of the fuel distributor 1 can for example be done on a Montagerundtisch with two working positions. During assembly of a fuel distributor 1, the previously mounted tubular manifold 2 may be tightly tested. Then the valve cups 3 to 6, each equipped with a sealing ring 25, 26 and in the

Mounting device positioned. Also on the stopper 40 and the

Connecting piece 41, the corresponding sealing rings 44, 46 are pushed. Then, the stopper 40 and the fitting 41 in the tubular

Distributor 2 pushed. Then the tubular distributor piece 2 can be pushed onto the hollow mandrels 21, 22 of the valve cups 3 to 6 serving as connecting pins. The clamping part 10 can then be joined in a spreading device and pushed in the spread state together with the spreading over the joined components of the fuel distributor 1. Then the spreading device is withdrawn. The joined clamping part 10 secures by the elastic deformation of its geometry then a secure connection of the individual components of the fuel distributor 1 even at operating pressure, in particular a medium pressure. The invention is not limited to the described embodiments.

Claims

claims

1 . Fuel distributor (1), in particular for fuel injection systems of

mixture-compressing, spark-ignited internal combustion engines, comprising a distributor piece (2), a plurality of valve cups (3 - 6) arranged on the distributor piece (2) and a clamping part (10), wherein the clamping part (10) on the distributor piece (2) and the

Valves (3 - 6) is supported and wherein the clamping part (10) is biased and the

Valves (3 - 6) are biased against the manifold (2).

2. Fuel distributor according to claim 1,

characterized,

the distributor piece (2) is formed from at least one plastic and / or that the valve cups (3 - 6) are formed from at least one plastic and / or as an injection molded part.

3. Fuel distributor according to claim 1 or 2,

characterized,

that the clamping part (10) is formed at least substantially as a clamping plate (10) and / or as a punched and bent part (10).

4. Fuel distributor according to claim 3,

characterized,

the clamping part (10) is formed at least substantially from a non-alloyed steel sheet (10).

5. Fuel distributor according to one of claims 1 to 4,

characterized,

the valve cups (3 - 6) each have a hollow mandrel (21, 22) which is at least partially inserted into a bore (23, 24) of the distributor piece (2) provided for the respective valve cup (3 - 6).

6. Fuel distributor according to claim 5,

characterized, a sealing ring (25, 26) is provided for each valve cup (3 - 6), which is connected to a

Outer side (20) of the manifold (2) and the hollow mandrel (21, 22) of the respective valve cup (3 - 6) surrounds, and that due to the bias of the clamping member (10) of the sealing ring (25, 26) between the outside ( 16) of the distributor piece (2) and the respective valve cup (3 - 6) is subjected to a bias voltage.

7. fuel distributor according to claim 6,

characterized,

that on the valve cups (3 - 6) annular grooves (27, 28) are provided, in which the respective sealing ring (25, 26) is at least partially inserted.

8. Fuel distributor according to one of claims 5 to 7,

characterized,

the valve cups (3 - 6) each have a channel (29, 30) which extends from the respective hollow mandrel (21, 22) to a valve receptacle (32) and in that the channel (29, 30) is at least approximately 90 ° is angled.

9. Fuel distributor according to one of claims 1 to 8,

characterized,

the valve piece (2) is designed as an at least substantially tubular valve piece (2).

10. Fuel distributor according to claim 9,

characterized,

a stopper (40) is provided closing the tubular manifold (2) at one end (42), and the biasing member (10) biases the stopper (40) against the tubular manifold (2),

and or

a connection piece (41) is provided which is arranged at one end (43) of the tubular distributor piece (2), and in that the clamping piece (10) biases the connection piece (41) against the tubular distributor piece (2).