EP3094856A1

EP3094856A1 - Fuel injection system with a fuel-conducting component, a fuel injection valve, and a connection device

Info

Publication number: EP3094856A1
Application number: EP14805802.7A
Authority: EP
Inventors: Klaus Lang
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2014-01-15
Filing date: 2014-11-21
Publication date: 2016-11-23
Anticipated expiration: 2034-11-21
Also published as: KR20160107189A; CN105917110A; KR102250932B1; US9816472B2; PL3094856T3; US20160333836A1; DE102014200581A1; WO2015106862A1; EP3094856B1; CN105917110B

Abstract

A connection device (6) for fuel injection systems is used to connect a fuel injection valve (5) to a cup (2) and to a fuel-conducting component (3). Connection elements (15, 16) are provided which can be inserted into the cup (2) such that the elements are at least approximately arranged on a plane (24) that is oriented perpendicularly to a longitudinal axis (7) of the cup (2). The connection elements (15, 16) are designed as pin-type connection elements (15, 16). Furthermore, the connection elements (15, 16) are designed so as to be inserted into the cup (2) within an outer cross-section (28) of the cup (2). Additionally, a securing element (17) is provided for securing the connection elements (15, 16). The invention further relates to a fuel injection system (1) comprising such a connection device (6).

Description

Description title

Fuel injection system with a fuel-carrying component, a

Fuel injection valve and a connecting device

State of the art

The invention relates to a connection device for fuel injection systems for connecting a fuel injection valve with a cup of a fuel-carrying component and a fuel injection system with such a connecting device. Specifically, the invention relates to the field of fuel injection systems for

mixture-compression, spark-ignited internal combustion engines.

From US 7,856,962 B2 a fuel injection system for direct injection in an internal combustion engine is known. In the known fuel injection system, a cup is provided, to which a fuel injection valve via a hollow cylindrical pipe section and a connecting element can be connected. Here, the connecting element is designed as a U-shaped clip having two spaced legs. The fuel injection system known from US Pat. No. 7,856,962 B2 has the disadvantage that, especially in the region of the connection between the fuel injection valve and the cup, the required installation space and thus the required space requirement in the engine are high. This is necessary in practice, always higher demands on the widest possible use of the available space in the engine compartment in

Combination with a space-saving design as possible.

Disclosure of the invention

The connecting device according to the invention with the features of claim 1 and the fuel injection system according to the invention with the features of claim 10 have the advantage that an improved design and a more compact design are possible. Specially a space-saving construction is possible, so that always higher requirements for efficient equipping and use of the engine compartment can be accommodated.

The measures listed in the dependent claims are advantageous

Further developments of the connection device specified in claim 1 and the fuel injection system specified in claim 10 possible.

Specifically, the fuel injection system is suitable for gasoline direct injection. Furthermore, the connecting device is particularly suitable for fuel injection systems that are used for gasoline direct injection. The fuel-carrying component is preferably designed as a fuel distributor, in particular as a fuel distributor strip. Such a fuel distributor can, on the one hand, distribute the fuel over several

Fuel injection valves, in particular high-pressure injection valves serve. On the other hand, the fuel distributor as a common fuel storage for the

Fuel injection valves serve. The fuel injection valves are then preferably via corresponding connection means with the cups of the

Fuel distributor connected. During operation, the fuel injection valves then inject the fuel required for the combustion process under high pressure into the respective combustion chamber of the internal combustion engine. In this case, the fuel can be compressed via a high-pressure pump and quantity-controlled via a high-pressure line into the fuel distributor.

Especially with electromagnetic high-pressure injection valves, which can be used in gasoline engines with direct injection, a conspicuous and disturbing contribution to the overall noise of the engine can be made, which can be described as a valve plug.

Such a valve leakage is caused by the rapid opening and closing of the

Fuel injection valve, in which the valve needle is adjusted with high dynamics in the respective end stops. The impact of the valve needle in the end stops leads to short-term, but very high contact forces, which via a housing of the

Fuel injection valve can be transmitted to the cylinder head and the fuel-carrying component, if there is a direct contact. This then leads to the cylinder head or to the fuel component leading to a strong noise. By the connection means can advantageously an effective

Decoupling be achieved on the one hand to the cylinder head and the other part to the fuel-carrying component in a compact design and thus with a small footprint. Furthermore, it is possible to use an additional hold-down device, for example uses a spring force to save or designed with a reduced spring force. Thus, the fuel injection valves can be hung to improve the acoustic behavior and to reduce the external forces in an advantageous manner. By mounting the fuel injection valve to the cup of the fuel-carrying component by means of the connection means, the fuel injection valve can be positioned so that the fuel injection valve is not in direct contact with the cylinder head. The required seal between the fuel injection valve and the

Cylinder head can be selected independently of the suspension. For example, between the fuel injection valve, in particular a valve tip of the

Fuel injection valve, and the cylinder head may be provided a Teflon seal.

In addition, there are great constructive freedom with respect to the seal between the fuel injection valve, in particular a connector of the

Fuel injector, and the cup of the fuel component leading. Thus, the cheapest for the particular application form of the seal can be realized here.

In operation, due to the pressure of the fuel supplied, a force acts on the fuel injector in the direction of the cylinder head. In order to hold the fuel injection valve in this case on the cup, a certain holding force is required, which by the support of the fuel injection valve, in particular the fitting of the

Fuel injection valve, is applied to the cup, wherein the support via the at least one connecting element of the connecting device takes place. Thus, the required holding force can be applied without the fuel injection valve is substantially adjusted from the predetermined mounting position. Therefore, one is

reliable attachment of the fuel injection valve to the cup of the fuel-carrying component by means of the connecting device possible.

Since the connecting element is designed so that it can be inserted within the outer cross section of the cup in the cup, the acoustically advantageous principle of

suspended fuel injectors are also implemented in very tight spaces.

Furthermore, by the geometric configuration of the connecting element a

Adapted to the hydraulic operating pressures. Especially that

Connecting element be designed as a wire section. Thus, the design also has the advantage that by a simple variation of the cost and accurate

Wire sections or the like, which can serve for the design of the connecting elements, can be adapted to the hydraulic operating pressures. Depending on the configuration of the connecting device, it is possible, if appropriate to realize a separable suspension of the fuel injection valve to the cup of the fuel component leading. In this case, no connecting parts, that is, none of the connecting elements protrude beyond the actual fuel storage. The attachment of the fuel injection valve is effected via at least one connecting element, which may be configured as a pin, wherein the connecting element is joined at least approximately 90 ° to the axial direction of the fuel injection valve and intercepting by positive engagement, the hydraulic forces of the internal pressure of the fuel component. The hedging of the connecting element against loss can be done via an additional component, namely a securing element, which preferably does not have the

actual space of the fuel reservoir protrudes.

Thus, it is advantageous that a securing element is provided, which serves for securing the at least one connecting element, if the at least one

Connecting element is inserted within the outer cross section of the cup in the cup, wherein the securing element can be arranged on the cup. It is particularly advantageous that the securing element for securing the at least one

Connecting element within the outer cross section of the cup on the cup

can be arranged. Thus, none of the components of the connecting device protrudes beyond the outer cross section of the cup, so that there is the best possible reduction of the space required.

The securing element can be designed, for example, via a circumferential securing ring and / or as a securing plate. Thus, it is advantageous that the

Secured element is designed as at least partially annular securing element. The securing element can in this case be configured in particular as a part-ring-shaped securing element. However, the securing element can also be designed as a completely or largely closed, annular securing element. Optionally, a connection of the ends of such an annular configured securing element in the assembled state is possible. Furthermore, it is thus advantageous that the securing element has a circular cross-section or a rectangular

Cross section has. In one embodiment of the securing element with a rectangular cross-section, it is particularly advantageous that the longer side of the rectangular cross-section along the longitudinal axis of the cup or the fuel injection valve is oriented. As a result, a flat construction with respect to an attachment to the cup is possible. This can be specifically ensured that such a band-shaped securing element is not or only slightly beyond the outside of the cup out. Preferably, the securing element is not on the outside out of the cup so that it fits into the cup inside the outer cross section of the cup.

Additionally or alternatively, a bond may be provided to secure the at least one connecting element to the cup and / or to the fuel injection valve when the fuel injection system is mounted. Thus, it is advantageous that the at least one connecting element for securing the connecting element in the mounted state is connectable to the cup and / or the fuel injection valve at at least one predetermined splice. Here are an embodiment of the

Connecting element and / or the cup and / or the fuel injection valve predetermined so that such a splice can be realized.

Additionally or alternatively, a backup of the connecting element can also be realized by a plastic sheath. Therefore, it is also advantageous that the at least one connecting element in the mounted state can be secured by an at least partially executed plastic coating of the cup.

Advantageously, a backup by caulking is possible. In this embodiment, an additional securing element can also be omitted if the required area or the required areas are caulked. Thus, it is advantageous that the at least one connecting element in the mounted state by at least one caulking of the cup is securable. Here, the cup can be plastically deformed at least at one point or in at least one area. Such a plastic deformation can be done especially on the outside of the cup. The connecting element can then be permanently connected to the cup. In this case, a non-positive and positive connection between the cup and the connecting element can be produced by plastic deformation.

In addition, a positive connection between the connecting element and the fuel injection valve in the assembled state of the fuel injection system can serve to secure the connecting element. In such a case, an additional

Fuse element also eliminated if the form-fitting an emigration is prevented under operating pressure. Thus, it is advantageous that the connecting element is designed so that for securing the connecting element in the mounted state, a positive connection between the connecting element and the fuel injection valve can be generated. Accordingly, it is advantageous that the fuel injection valve, in particular a connecting piece of the fuel injection valve, is designed such that for securing the connecting element in the assembled state of the positive connection between the connecting element and the fuel injection valve, in particular between the connecting element and the connecting piece, can be generated.

Depending on the design and application is also a combination of

Security measures conceivable. Furthermore, it is also conceivable in principle that several safety measures are used on a fuel injection system, the different connecting elements and / or different

Affect connecting means of the fuel injection system. In particular, a reliable and noise-reducing suspension of a fuel injection valve can thus be realized on the fuel-carrying component for small installation spaces.

Brief description of the drawings

Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with corresponding reference numerals. Show it:

Fig. 1 is a fuel injection system with a connecting device according to a first embodiment of the invention in an excerpt from, schematic

Section;

FIG. 2 shows the connecting device of the first exemplary embodiment of the invention shown in FIG. 1 in a schematic, spatial representation; FIG.

Fig. 3 is a fuel injection system with a connecting device according to a second embodiment of the invention in an excerpt from, schematic

Section; 4 shows the connecting device of the second exemplary embodiment of the invention shown in FIG. 3 in a schematic, spatial representation;

Fig. 5 is a fuel injection system with a connecting device according to a third embodiment of the invention in an excerpt from, schematic

Section; Fig. 5 is a fuel injection system with a connecting device according to a possible modification of the third embodiment of the invention in one

excise, schematic sectional view; Fig. 6 is a fuel injection system with a connecting device according to a fourth embodiment of the invention in an excerpt from, schematic

Sectional view and

Fig. 7 is a fuel injection system in a schematic representation according to a possible embodiment of the invention.

Embodiments of the invention

1 shows a fuel injection system 1 with a cup 2, a fuel-carrying component 3 (FIG. 7), a connecting piece 4 of a fuel injection valve 5 (FIG. 7) and a connecting device 6 according to a first exemplary embodiment of the invention in an excerptional, schematic sectional illustration , Here, a longitudinal axis 7 is predetermined, along which the fuel injection valve 5 or the connecting piece 4 of the fuel injection valve 5 is arranged in the assembled state. The longitudinal axis 7 is at the same time an axis 7 of an inner space 8 of the cup 2, in which the connecting piece 4 is partially inserted.

The cup 2 has a fuel inlet 9, via the fuel from the component 3 in the interior 8 of the cup 2 can be guided. Further, the connector 4 has a fuel passage 10 through which the fuel into an interior of the

Fuel injection valve 5 is guided.

The configuration of the connecting device 6 of the fuel injection system 1 of the first embodiment is described below with reference to FIG. 2.

Fig. 2 shows the connecting device 6 of the first shown in Fig. 1

Embodiment in a schematic, spatial representation before assembly. The connecting device 6 has connecting elements 15, 16 and a securing element 17 in this exemplary embodiment. The connecting elements 15, 16 are designed as pin-shaped connecting elements 15, 16. Furthermore, the securing element 17 in this embodiment as a part-annular securing element 17 and thus as

partially annular securing element 17 configured. The fuse element 17 has a rectangular cross-section 18 in this embodiment. The rectangular cross section 18 of the securing element 17 is formed with a longer side 19 and a shorter side 20. Here, the longer side 19 is oriented parallel to the longitudinal axis 7. The connecting elements 15, 16 each have a length 21 and a

5 diameter 22. The length 21 of the connecting elements 15, 16 is in this case selected so that the connecting elements 15, 16 are not in the mounted state on an outer side 23 of the cup 2 addition. Furthermore, in this embodiment also a

sufficient space for the fuse element 17 is provided, so that the

Secured element 17 also does not protrude beyond the outer side 23 of the cup 2 in the mounted state. For assembly, the connecting elements 15, 16 are preferably arranged parallel to one another in a plane 24 which is oriented perpendicular to the longitudinal axis 7 of the cup 2. When the connecting elements 15, 16 are inserted into the cup 2, then they cooperate in a suitable manner with a shoulder 25 of the connecting piece 4 of the fuel injection valve 4, so that the fuel injection valve 5 at the

5 cup 2 is held. In this embodiment, the cup 2 is a

Through hole 26 configured, which extends on both sides by a wall 27 of the cup 2. The pin-shaped connecting element 15 can be inserted into the through-bore 26 in such a way that it can be inserted into the cup 2 within an outer cross-section 28 of the cup 2. This means that the connecting element 15 is not in the inserted state o on the outside 23 of the cup 2 addition. A corresponding through hole is provided for the pin-shaped connecting element 16. The connecting element 16 is likewise designed such that it can be inserted into the cup 2 within the outer cross section 28 of the cup 2. Thus, the two connecting elements 15, 16 are arranged at least approximately parallel to one another in the plane 24 in order to hold the fuel injection valve 5 on the shoulder 25 of the connecting piece 4. As a result, the fuel injection valve 5 is connected to the cup 2 of the fuel-carrying component 3. o The securing element 17 is provided in a on the outside 23 of the cup 2

Recess 29 of the cup 2 inserted. Here, the securing element 17 is disposed within the outer cross section 28 of the cup 2 on the cup 2. Thus it stands

Securing element 17 in the mounted state not on the outside 23 of the cup 2 addition.

The securing element 17 serves to secure the two connecting elements 15, 16. The securing element 17 prevents in this embodiment that the

Connecting elements 15, 16 slip out of their respective through hole 26 or pushed out. In operation, when the fuel is supplied at high pressure via the fuel inlet 9, the high hydraulic forces are absorbed by the connecting elements 15, 16 of the connecting device 6. The positioning of the connecting elements 15, 16 required for this function is always ensured by the securing element 17.

In a modified embodiment, additionally or alternatively, a

Securing the connecting element 15 via one or more splices 35, 36 done. The splices 35, 36 can connect the connecting element 15 with the cup 2. Furthermore, it is possible that corresponding splices 37, 38 serve to connect the connecting element 15 to the connecting piece 4 in the region of the shoulder 25. Thus, the connecting element 15 may be connected to the cup 2 and / or the fuel injection valve 5 for securing the connecting element 15 in the mounted state on at least one predetermined splice 35 to 38. Correspondingly, the connecting element 16 for securing the connecting element 16 in the assembled state can also be connected to the cup 2 and / or the fuel injection valve 5 at at least one predetermined adhesion point.

3 shows a fuel injection system 1 with a connection device 6

according to a second embodiment in a partial, schematic sectional view. Furthermore, FIG. 4 shows the connecting device 6 of the second exemplary embodiment shown in FIG. 3 in a schematic, spatial representation before assembly. In this embodiment, the securing element 17 has a

circular cross-section 18 on. In a modified embodiment, the securing element 17 may also have an elliptical cross section 18. In principle, other cross sections 18, in particular a square cross section 18, are conceivable. The cross section 18 of the securing element 17 has a diameter 39. Of the

Diameter 39 can be selected equal to or different from the diameter 22 of the connecting elements 15, 16. Furthermore, the securing element 17 is designed in this embodiment as a part-annular securing element 17. The

Length 21 of the connecting elements 15, 16 is chosen so short that the

Securing element 17 at least partially within the outer cross section 28 of the cup 2 can be arranged. Here, the securing element 17 is arranged in an annular recess 29, which is configured on the outside 23 of the cup 2.

5 shows a fuel injection system 1 with a connection device 6

according to a third embodiment in a partial, schematic sectional view. The connecting device 6 has in this embodiment, the Connecting elements 15, 16 on. Here, only the connecting element 15 is shown to simplify the illustration. This is in this embodiment

Connecting element 15 inserted into the through hole 26 of the cup 2. Furthermore, caulking 40, 41 are provided, via which the connecting element 15 is secured. The caulking 40, 41 are in this case provided on the outside 23 of the cup 2. Depending on the configuration of the caulking 40, 41 can also be a force and

Form fit can be made with the connecting element 15.

The securing element 17 and the recess 29 of the cup 2 can in this

Embodiment omitted. The connecting element 16 can be secured in a corresponding manner in its through hole by caulking.

FIG. 5A shows a fuel injection system 1 with a connection device 6 according to a possible modification of the third exemplary embodiment in an excerptional, schematic sectional illustration. The connecting device 6 has in this modified embodiment, the connecting elements 15, 16. Here, only the connecting element 15 is shown to simplify the illustration. In this modified embodiment, the bore 26 is a blind hole 26th

designed. A bore bottom 42 of the blind hole 26 is in this case in the wall 27 of the cup 2. Thus, the connecting element 15 with its two ends 43, 44 each project into the wall 27. As a result, a two-sided attachment of the connecting element 15 to the cup 2 is possible along the longitudinal axis 7.

The connecting element 15 is inserted into the blind hole 26 of the cup 2. Further, in this modification, only one (exactly one) caulking 40 is provided, via which the connecting element 15 is secured in the blind bore 26. The caulking 40 is provided here on the outside 23 of the cup 2. Depending on the design of the

Stemming 40 can also be a force and form fit with the

Connecting element 15 are produced.

The bore 26 thus penetrates the wall 27 only on one side and on the other hand as a blind hole 26 'executed.

The securing element 17 and the recess 29 of the cup 2 can be omitted. The connecting element 16 can be secured in a corresponding manner in its blind hole by unilateral caulking. In principle, a further modification is conceivable in which for one of the connecting elements 15, 16 a two-sided caulking, as shown in Fig. 5, and for the other a one-sided caulking, as shown in Fig. 5A, are provided. Furthermore, the embodiment with a blind hole 26 'or the bore 26 as a blind hole 26 optionally also in the other embodiments is a possible modification.

6 shows a fuel injection system 1 with a connection device 6

according to a fourth embodiment in a partial, schematic sectional view. In this embodiment, a recess 45 is provided on the connecting element 15. Further, a bulge 46 is provided on the shoulder 25 of the connector 4. In the assembled state, a positive connection 47 is formed between the bulge 46 of the shoulder 25 of the connecting piece 4 of the fuel injection valve 5 and the recess 45 of the connecting element 15. In operation, fuel is fed via the fuel inlet 9 into the interior 8 of the cup 2. Here, a seal 48 between the connector 4 and the cup 2 is provided. Due to the fuel pressure (operating pressure), the connecting piece 4 is acted upon in a direction 49 along the longitudinal axis 7 in the direction of a cylinder head of the internal combustion engine. By the fuel pressure of the positive locking 47 for self-fixation of

Ensures connecting element 5.

Thus, the space required depending on the design can be limited to the outer cross section 28 or at least only slightly larger than the outer cross section 28 of the cup 2. This results in optimized conditions for exploitation of the

Available space in the engine compartment of a motor vehicle or the like.

Fig. 7 shows a fuel injection system 1 in a schematic representation

according to a possible embodiment of the invention. The fuel-carrying component 3 has in this embodiment a base body 50 and cups 2,

2A, 2B. The main body 50 may be configured as a tubular base body 50. However, other embodiments are conceivable. The component 3 can thus be designed as a fuel distributor 3, in particular fuel distributor strip 3. The component 3 may serve for storing fuel and distributing the stored fuel to a plurality of fuel injection valves 5, 5A, 5B of the fuel injection system 1. The number of fuel injection valves 5, 5A, 5B is chosen here in relation to the respective application. Optionally, a plurality of components 3, in particular, two main body 50, be provided to allow a division of the fuel on opposite rows of cylinders of an internal combustion engine.

The fuel injection system 1 has a tank 51 and a high-pressure pump 52. If appropriate, a prefeed pump may also be provided here. In addition, a pressure relief valve 53 is provided to limit the pressure of the fuel delivered into the body 50.

The fuel injection valves 5, 5A, 5B are corresponding to each other

Connecting means 6, 6A, 6B connected to the cups 2, 2A, 2B of the component 3.

In this embodiment, the connecting device 6 has a

Plastic casing 17, which forms the securing element 17. By the

Plastic casing 17, the connecting elements 15, 16, whose design and arrangement are described in a corresponding manner with reference to FIGS. 1 to 6, secured to the cup 2. Furthermore, the connecting devices 6A, 6B as

Plastic sheaths 17A, 17B formed securing elements 17A, 17B. The invention is not limited to the described embodiments.

Claims

claims

1. Connection device (6) for fuel injection systems for connecting a fuel injection valve (5) with a cup (2) of a fuel-carrying component (3), wherein at least one connecting element (15, 16) is provided and wherein the connecting element (15, 16) so insertable into the cup (2) is that

Connecting element (15, 16) is arranged at least approximately in a plane (24) which is oriented perpendicular to a longitudinal axis (7) of the cup (2),

characterized,

in that the connecting element (15, 16) is designed as a pin-shaped connecting element (15, 16) and in that the connecting element (15, 16) is designed so that the connecting element (15, 16) is within an outer cross-section (28) of the cup (2). in the cup (2) can be inserted.

2. Connecting device according to claim 1,

characterized,

in that a securing element (17) is provided which serves for securing the at least one connecting element (15, 16) when the at least one connecting element (15, 16) within the outer cross section (28) of the cup (2) into the cup (2). is inserted, and that the securing element (17) on the cup (2) can be arranged.

3. Connecting device according to claim 2,

characterized,

in that the securing element (17) for securing the at least one connecting element (15, 16) within the outer cross section (28) of the cup (2) can be arranged on the cup (2).

4. Connecting device according to claim 2 or 3,

characterized,

in that the securing element (17) is at least partially annular

Secured element (17) is designed.

5. Connecting device according to one of claims 2 to 4,

characterized, the securing element (17) has a circular cross section (18) or a rectangular cross section (18).

6. Connecting device according to one of claims 1 to 5,

5 characterized

in that the at least one connecting element (15, 16) for securing the

Connecting element (15, 16) in the assembled state at least one predetermined splice (35 - 38) with the cup (2) and / or the fuel injection valve (5) is connectable.

0

7. Connecting device according to one of claims 1 to 6,

characterized,

in that the connecting element (15, 16) is designed such that for securing the

Connecting element (15, 16) in the mounted state, a positive connection (47) between the connecting element (15, 16) and the fuel injection valve (5) can be generated.

8. Connecting device according to one of claims 1 to 7,

characterized,

in that the at least one connecting element (15, 16) in the assembled state can be secured by o at least one caulking (40, 41) on the cup (2).

9. Connecting device according to one of claims 1 to 8,

characterized,

in that the at least one connecting element (15, 16) in the assembled state can be secured by a plastic casing (17) of the cup (2) which is at least partially executed.

10. Fuel injection system (1), in particular for Gemischverdichtende, spark-ignition internal combustion engine, with an at least fuel-carrying component (3) having at least one cup (2, 2A, 2B), at least one fuel injection valve (5, 0 5A, 5B) and at least a connecting device (6, 6A, 6B) according to one of the claims

1 to 9, wherein the fuel injection valve (5, 5A, 5B) via the connecting means (6, 6A, 6B) with the cup (2, 2A, 2B) of the fuel-carrying component (3) is connected.