EP2284385B1 - Fuel rail device - Google Patents
Fuel rail device Download PDFInfo
- Publication number
- EP2284385B1 EP2284385B1 EP20090008906 EP09008906A EP2284385B1 EP 2284385 B1 EP2284385 B1 EP 2284385B1 EP 20090008906 EP20090008906 EP 20090008906 EP 09008906 A EP09008906 A EP 09008906A EP 2284385 B1 EP2284385 B1 EP 2284385B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pipe
- fuel rail
- fuel injector
- union
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
Definitions
- the invention relates to a fuel rail device of a combustion engine. Furthermore, the invention relates to a fuel rail fuel injector assembly, comprising a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail of a combustion engine.
- Fuel rail devices and coupling assemblies for hydraulically and mechanically coupling a fuel injector to a fuel rail are in widespread use, in particular for internal combustion engines. Fuel can be supplied to an internal combustion engine by the fuel rail device and the coupling assembly through the fuel injector.
- a fuel accumulator to which the fuel injectors are connected and which has a relatively large volume.
- a fuel accumulator is often referred to as a fuel rail.
- the fuel injectors can be coupled to the fuel rail in different manners.
- Known fuel rails comprise a hollow body with recesses in form of fuel injector cups, wherein the fuel injectors are arranged.
- the connection of the fuel injectors to the fuel injector cups that supply the fuel from a fuel tank via a low or high-pressure fuel pump needs to be very precise to get a correct injection angle and a sealing of the fuel.
- the object of the invention is to create a fuel rail device and a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail which are simply to be manufactured and which facilitate a reliable and precise connection between the fuel rail and the fuel injector without a resting of the fuel injector on the cylinder head of the combustion engine.
- the invention is distinguished by a fuel rail device of a combustion engine.
- the fuel rail device comprises a fuel rail and a union having a longitudinal axis.
- the union is fixedly coupled to the fuel rail and is in hydraulic communication with the fuel rail.
- the fuel rail device comprises a pipe which is partially engaged by the union and is designed to be in hydraulic communication with a fuel injector.
- the fuel rail device comprises a sealing ring.
- the sealing ring is arranged coaxially to the pipe and is arranged radially between the union and the pipe and is designed to sealingly couple the union to the pipe.
- the pipe has an outer surface comprising a groove.
- the groove faces the union, and the sealing ring s partially arranged in the groove.
- the pipe comprises a tube and a ring holder element which is arranged coaxially to the tube.
- the ring holder element is fixedly coupled to the tube.
- the ring holder element comprises the groove.
- a part of the ring holder element extends in axial direction from an axial end of the tube facing the fuel rail in a manner that the ring holder element covers at least partially the axial end of the tube. This has the advantage that the ring holder element can protect the axial end of the tube facing the fuel rail against mechanical stress or damage.
- the ring holder element is welded or brazed to the tube. This has the advantage that a secure fixing of the ring holder element relative to the tube is possible.
- the union is welded or brazed to the fuel rail. This has the advantage that a secure fixing of the union relative to the fuel rail is possible.
- the pipe comprises a flange and a clip element is arranged coaxially to the pipe.
- the clip element is in engagement with the union and the flange to prevent an axial movement of the pipe relative to the union.
- the invention is distinguished by a fuel rail fuel injector assembly with a fuel rail device according to the first aspect of the invention and a coupling assembly.
- the fuel rail device is mechanically and hydraulically coupled to the coupling assembly.
- the coupling assembly comprises a fuel injector with a fuel injector body and a central longitudinal axis.
- the fuel injector body comprises a partially cone-shaped cavity.
- the coupling assembly comprises a fuel pipe which is hydraulically coupable to the fuel rail and a cup-shaped coupling element.
- the cup-shaped coupling element is in engagement with the fuel injector body to retain the fuel pipe in the fuel injector in direction of the central longitudinal axis.
- the fuel pipe has a rounded end section which is at least partially arranged in the partially cone-shaped cavity and is in direct contact with the fuel injector body.
- this coupling assembly is that the fuel pipe is flexible relative to the injector body. Furthermore, a compensation of mechanical stress is possible. In particular, it is easy possible that the end section is limited pivotable relative to the fuel injector body. Furthermore, the coupling assembly allows an assembly of the fuel injector and the fuel rail without a further metallic contact between the fuel injector and further parts of the combustion engine. Consequently, a noise transmission between the fuel injector and further parts of the combustion engine can be kept small.
- the fuel injector body comprises an outer screw thread and the cup-shaped coupling element comprises an inner screw thread which is in engagement with the outer screw thread of the fuel injector body.
- a clamp element is fixedly coupled to a cylinder head of the combustion engine and comprises an aperture being designed to engage the fuel pipe to enable a mechanical cooperation between the fuel pipe and the cylinder head.
- a fuel feed device 10 is assigned to an internal combustion engine 22 ( figure 1 ) which can be a diesel engine or a gasoline engine. It includes a fuel tank 12 that is connected via a first fuel line to a fuel pump 14. The output of the fuel pump 14 is connected to a fuel inlet 16 of a fuel rail 18. In the fuel rail 18, the fuel is stored for example under a pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine. Fuel injectors 20 are connected to the fuel rail 18 and the fuel is fed to the fuel injectors 20 via the fuel rail 18.
- Figure 2 shows a configuration of a fuel rail device 60 which comprises the fuel rail 18 and a fuel pipe 24.
- the pipe 24 may be in hydraulic communication with the fuel injector 20.
- the pipe 24 comprises a tube 26 and a ring holder element 28 which is arranged coaxially to the tube 26 and which is fixedly coupled to the tube 26.
- the ring holder element 28 is welded or brazed to the tube 26.
- the pipe 24 has an outer surface 30 which comprises a groove 32.
- the groove 32 faces a union 34 which is fixedly coupled to the fuel rail 18.
- the union 34 is welded or brazed to the fuel rail 18.
- the union 34 is shaped as a hollow cylinder with a longitudinal axis L1 and makes a hydraulic communication with the fuel rail 18 possible.
- the union 34 receives a part of the pipe 24.
- the fuel rail device 60 has a sealing ring 38 which is arranged in the groove 32 in radial direction between the fuel pipe 24 and the union 34.
- the sealing ring 38 has an outer surface 40.
- the outer surface 40 of the sealing ring 38 is in sealing contact with the outer surface 30 of the fuel pipe 24.
- the fuel rail device 60 has a supporting ring 42 which is arranged in the groove 32 in radial direction between the fuel pipe 24 and the union 34.
- the sealing ring 38 is supported by the supporting ring 42 to avoid an axial movement of the sealing ring 38 relative to the pipe 24.
- the pipe 24, preferably the ring holder element 28 has a flange 44 extending in radial direction from the tube 26. Coaxially to the pipe 24 a clip element 46 is arranged. The clip element 46 is engaged with the union 34 and the flange 44.
- Figure 3 shows an embodiment of the fuel rail device 60 in which a part 49 of the ring holder element 28 extends in axial direction from an axial end 48 of the tube 26 which faces the fuel rail 18.
- the part 49 of the ring holder element 28 is shaped as a collar which covers or overlaps the axial end 48 of the tube 26 in axial direction. This makes it possible that the collar-shaped part 49 protects the axial end 48 of the tube 26 against mechanical damage.
- FIG 4 shows a configuration of the fuel rail device 60 wherein the pipe 24 has a corrugated section 50.
- the corrugated section 50 of the pipe 24 comprises at least the flange 44 and the groove 32 which may receive the sealing ring 38 and the supporting ring 42.
- the corrugated section 50 is preferably produced by stamping, cold-forming or hot-forming the pipe 24.
- the ring holder element 28 can be left and a low mass and a low weight of the pipe 24 can be obtained. This configuration, however, does not fall within the scope of the appended claims.
- Figure 5 shows a configuration of the fuel rail device 60 wherein the union 34 comprises an inner surface 52.
- a union groove 54 is arranged which faces the tube 26.
- a circlip 56 is arranged in the union groove 54.
- the circlip 56 is in mechanical cooperation with the sealing ring 38 and the supporting ring 42.
- the circlip 56 supports the sealing ring 38 and consequently prevents an axial movement of the sealing ring 38 relative to the union 34. This makes a secure sealing between the tube 26 and the union 34 possible.
- FIG. 6 shows a coupling assembly 90 with the fuel injector 20 in detail.
- the coupling assembly 90 may be coupled to the fuel rail 18 of the internal combustion engine 22.
- the coupling assembly 90 comprises the fuel pipe 24 and the fuel injector 20 with a fuel injector body 62 and a central longitudinal axis L2.
- the fuel injector body 62 has a cavity 64 which is partially cone-shaped.
- the pipe 24 has an outer surface 68 and is hydraulically coupled to the fuel rail 18 at a first end which is for example the axial end 48 in Figures 2 to 5 .
- the pipe 24 comprises a spherical or rounded end section 66.
- the end section 66 of the pipe 24 is in partial engagement with the partially cone-shaped cavity 64 of the fuel injector body 62. Therefore, a direct metal-to-metal contact between the pipe 24 and the fuel injector body 62 can be obtained. A sealing element can be avoided.
- the end section 66 is slightly pivotable relative to the fuel injector body 62. Consequently, the pipe 24 is flexible relative to the injector body 62 and mechanical stress on the pipe 24 can be avoided.
- the coupling assembly 90 has a cup-shaped coupling element 70 which is in engagement with the fuel injector body 62 to retain the fuel pipe 24 in the fuel injector 20 in direction of the central longitudinal axis L2.
- the coupling element 70 is formed as a ring element and has a centrally arranged through hole 72 and a screw thread 74 which is a female screw thread.
- the coupling element 70 is formed as a nut.
- the fuel injector body 62 has a screw thread 76 which is a male screw thread.
- the fuel injector body 62 and the coupling element 70 are fixedly coupled with each other by the screw threads 74, 76.
- the coupling element 70 is fixedly coupled to the fuel injector body 62 by the screw threads 74, 76, the fuel pipe 24 is retained in the fuel injector 20 in direction of the central longitudinal axis L2.
- a clamp element 78 is coupled to a cylinder head 84 of the combustion engine 22.
- the clamp element 78 has a protrusion which extends in radial direction relative to the longitudinal axis L2 of the fuel injector body 62.
- the protrusion has an orifice which is designed to take in a fixing element 80.
- the fixing element 80 is designed to rigidly couple the clamp element 78 to the cylinder head 84.
- the fixing element 80 is preferably a screw but it may also be of another type as a pin or a bolt as long as it enables a fixed coupling of the fuel injector body 62 to the cylinder head 84.
- the clamp element 78 has an aperture 82 which may receive the pipe 24 to enable a mechanical cooperation between the pipe 24 and the cylinder head 84.
- the pipe 24 can limitedly move in the aperture 82 in axial direction relative to the cylinder head 84 to avoid mechanical stress on the pipe 24.
- a distance element 88 is arranged that may give a fixed distance between the fuel injector body 62 and the cylinder head 84 and receive the fixing element 80.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- The invention relates to a fuel rail device of a combustion engine. Furthermore, the invention relates to a fuel rail fuel injector assembly, comprising a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail of a combustion engine.
- Fuel rail devices and coupling assemblies for hydraulically and mechanically coupling a fuel injector to a fuel rail are in widespread use, in particular for internal combustion engines. Fuel can be supplied to an internal combustion engine by the fuel rail device and the coupling assembly through the fuel injector.
- In order to keep pressure fluctuations during the operation of the internal combustion engine at a very low level, internal combustion engines are supplied with a fuel accumulator to which the fuel injectors are connected and which has a relatively large volume. Such a fuel accumulator is often referred to as a fuel rail. The fuel injectors can be coupled to the fuel rail in different manners.
- Known fuel rails comprise a hollow body with recesses in form of fuel injector cups, wherein the fuel injectors are arranged. The connection of the fuel injectors to the fuel injector cups that supply the fuel from a fuel tank via a low or high-pressure fuel pump needs to be very precise to get a correct injection angle and a sealing of the fuel.
- The object of the invention is to create a fuel rail device and a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail which are simply to be manufactured and which facilitate a reliable and precise connection between the fuel rail and the fuel injector without a resting of the fuel injector on the cylinder head of the combustion engine.
- The objects are achieved by the features of the independent claim. Advantageous embodiments of the invention are given in the sub-claims.
- According to a first aspect the invention is distinguished by a fuel rail device of a combustion engine. The fuel rail device comprises a fuel rail and a union having a longitudinal axis. The union is fixedly coupled to the fuel rail and is in hydraulic communication with the fuel rail. Furthermore, the fuel rail device comprises a pipe which is partially engaged by the union and is designed to be in hydraulic communication with a fuel injector. The fuel rail device comprises a sealing ring. The sealing ring is arranged coaxially to the pipe and is arranged radially between the union and the pipe and is designed to sealingly couple the union to the pipe.
- This has the advantage that a secure and reliable coupling between the fuel rail and the pipe connected with the fuel injector is possible. Furthermore, a good sealing between the fuel rail and the pipe connected with the fuel injector can be obtained. Additionally, a compensation of mechanical stress of the coupling between the fuel rail and the pipe is possible.
- The pipe has an outer surface comprising a groove. The groove faces the union, and the sealing ring s partially arranged in the groove. By this a reliable fixing of the sealing ring relative to the pipe in particular in axial direction is possible.
- The pipe comprises a tube and a ring holder element which is arranged coaxially to the tube. The ring holder element is fixedly coupled to the tube. The ring holder element comprises the groove. This has the advantage that a very secure fixing of the sealing ring relative to the pipe possible.
- A part of the ring holder element extends in axial direction from an axial end of the tube facing the fuel rail in a manner that the ring holder element covers at least partially the axial end of the tube. This has the advantage that the ring holder element can protect the axial end of the tube facing the fuel rail against mechanical stress or damage.
- In an advantageous embodiment the ring holder element is welded or brazed to the tube. This has the advantage that a secure fixing of the ring holder element relative to the tube is possible.
- In a further advantageous embodiment the union is welded or brazed to the fuel rail. This has the advantage that a secure fixing of the union relative to the fuel rail is possible.
- In a further advantageous embodiment the pipe comprises a flange and a clip element is arranged coaxially to the pipe. The clip element is in engagement with the union and the flange to prevent an axial movement of the pipe relative to the union. This has the advantage that a detaching of the pipe from the union can be prevented in particular during the handling of the fuel rail device, for example during a mounting or demounting step.
- According to a second aspect the invention is distinguished by a fuel rail fuel injector assembly with a fuel rail device according to the first aspect of the invention and a coupling assembly. The fuel rail device is mechanically and hydraulically coupled to the coupling assembly.
- The coupling assembly comprises a fuel injector with a fuel injector body and a central longitudinal axis. The fuel injector body comprises a partially cone-shaped cavity. The coupling assembly comprises a fuel pipe which is hydraulically coupable to the fuel rail and a cup-shaped coupling element. The cup-shaped coupling element is in engagement with the fuel injector body to retain the fuel pipe in the fuel injector in direction of the central longitudinal axis. The fuel pipe has a rounded end section which is at least partially arranged in the partially cone-shaped cavity and is in direct contact with the fuel injector body.
- The advantage of this coupling assembly is that the fuel pipe is flexible relative to the injector body. Furthermore, a compensation of mechanical stress is possible. In particular, it is easy possible that the end section is limited pivotable relative to the fuel injector body. Furthermore, the coupling assembly allows an assembly of the fuel injector and the fuel rail without a further metallic contact between the fuel injector and further parts of the combustion engine. Consequently, a noise transmission between the fuel injector and further parts of the combustion engine can be kept small.
- In an advantageous embodiment according to the second aspect of the invention the fuel injector body comprises an outer screw thread and the cup-shaped coupling element comprises an inner screw thread which is in engagement with the outer screw thread of the fuel injector body. This has the advantage that a simple, fast and secure screw coupling between the fuel tube and the fuel injector is possible.
- In a further advantageous embodiment according to the second aspect of the invention a clamp element is fixedly coupled to a cylinder head of the combustion engine and comprises an aperture being designed to engage the fuel pipe to enable a mechanical cooperation between the fuel pipe and the cylinder head. This has the advantage that the forces on the fuel pipe can be absorbed at least partially by the clamp element. Furthermore, as the fuel pipe can move in the aperture in axial direction the fuel pipe can limitedly move in axial direction relative to the cylinder head.
- Exemplary embodiments of the invention are explained in the following with the aid of schematic drawings. These are as follows:
- Figure 1
- an internal combustion engine in a schematic view,
- Figure 2
- a longitudinal section through a configuration of a fuel rail device, with a clip element preventing axial movement of the pipe relative to the union,
- Figure 3
- a longitudinal section through an embodiment of the fuel rail device,
- Figure 4
- a longitudinal section through a configuration of the fuel rail device not falling within the claimed scope of protection,
- Figure 5
- a longitudinal section through a configuration of the fuel rail device, with a clip element preventing axial movement of the pipe relative to the union, and
- Figure 6
- a longitudinal section through a coupling assembly.
- Elements of the same design and function that occur in different illustrations are identified by the same reference character.
- A
fuel feed device 10 is assigned to an internal combustion engine 22 (figure 1 ) which can be a diesel engine or a gasoline engine. It includes afuel tank 12 that is connected via a first fuel line to afuel pump 14. The output of thefuel pump 14 is connected to afuel inlet 16 of afuel rail 18. In thefuel rail 18, the fuel is stored for example under a pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine.Fuel injectors 20 are connected to thefuel rail 18 and the fuel is fed to thefuel injectors 20 via thefuel rail 18. -
Figure 2 shows a configuration of afuel rail device 60 which comprises thefuel rail 18 and afuel pipe 24. Thepipe 24 may be in hydraulic communication with thefuel injector 20. Thepipe 24 comprises atube 26 and aring holder element 28 which is arranged coaxially to thetube 26 and which is fixedly coupled to thetube 26. Preferably, thering holder element 28 is welded or brazed to thetube 26. - The
pipe 24 has anouter surface 30 which comprises agroove 32. Thegroove 32 faces aunion 34 which is fixedly coupled to thefuel rail 18. Preferably, theunion 34 is welded or brazed to thefuel rail 18. Theunion 34 is shaped as a hollow cylinder with a longitudinal axis L1 and makes a hydraulic communication with thefuel rail 18 possible. Theunion 34 receives a part of thepipe 24. - The
fuel rail device 60 has a sealingring 38 which is arranged in thegroove 32 in radial direction between thefuel pipe 24 and theunion 34. The sealingring 38 has anouter surface 40. Theouter surface 40 of the sealingring 38 is in sealing contact with theouter surface 30 of thefuel pipe 24. By this a good sealing between thefuel pipe 24 and theunion 34 can be obtained and mechanical stress on thepipe 24 can be avoided. - The
fuel rail device 60 has a supportingring 42 which is arranged in thegroove 32 in radial direction between thefuel pipe 24 and theunion 34. The sealingring 38 is supported by the supportingring 42 to avoid an axial movement of the sealingring 38 relative to thepipe 24. - The
pipe 24, preferably thering holder element 28 has aflange 44 extending in radial direction from thetube 26. Coaxially to the pipe 24 aclip element 46 is arranged. Theclip element 46 is engaged with theunion 34 and theflange 44. By this an axial movement of thepipe 24 relative to theunion 34 can be limited in a manner that a sealing contact of the sealingring 38 with theunion 34 and thepipe 24 can be attained. Consequently, thepipe 24 can not detach from theunion 34 during a handling of thefuel rail device 60. -
Figure 3 shows an embodiment of thefuel rail device 60 in which apart 49 of thering holder element 28 extends in axial direction from anaxial end 48 of thetube 26 which faces thefuel rail 18. In this embodiment thepart 49 of thering holder element 28 is shaped as a collar which covers or overlaps theaxial end 48 of thetube 26 in axial direction. This makes it possible that the collar-shapedpart 49 protects theaxial end 48 of thetube 26 against mechanical damage. -
Figure 4 shows a configuration of thefuel rail device 60 wherein thepipe 24 has a corrugated section 50. The corrugated section 50 of thepipe 24 comprises at least theflange 44 and thegroove 32 which may receive the sealingring 38 and the supportingring 42. The corrugated section 50 is preferably produced by stamping, cold-forming or hot-forming thepipe 24. In this case, thering holder element 28 can be left and a low mass and a low weight of thepipe 24 can be obtained. This configuration, however, does not fall within the scope of the appended claims. -
Figure 5 shows a configuration of thefuel rail device 60 wherein theunion 34 comprises aninner surface 52. In the inner surface 52 aunion groove 54 is arranged which faces thetube 26. Acirclip 56 is arranged in theunion groove 54. Thecirclip 56 is in mechanical cooperation with the sealingring 38 and the supportingring 42. Thecirclip 56 supports the sealingring 38 and consequently prevents an axial movement of the sealingring 38 relative to theunion 34. This makes a secure sealing between thetube 26 and theunion 34 possible. -
Figure 6 shows acoupling assembly 90 with thefuel injector 20 in detail. Thecoupling assembly 90 may be coupled to thefuel rail 18 of theinternal combustion engine 22. Thecoupling assembly 90 comprises thefuel pipe 24 and thefuel injector 20 with afuel injector body 62 and a central longitudinal axis L2. Thefuel injector body 62 has acavity 64 which is partially cone-shaped. - The
pipe 24 has an outer surface 68 and is hydraulically coupled to thefuel rail 18 at a first end which is for example theaxial end 48 inFigures 2 to 5 . At a second end thepipe 24 comprises a spherical orrounded end section 66. Theend section 66 of thepipe 24 is in partial engagement with the partially cone-shapedcavity 64 of thefuel injector body 62. Therefore, a direct metal-to-metal contact between thepipe 24 and thefuel injector body 62 can be obtained. A sealing element can be avoided. Theend section 66 is slightly pivotable relative to thefuel injector body 62. Consequently, thepipe 24 is flexible relative to theinjector body 62 and mechanical stress on thepipe 24 can be avoided. - The
coupling assembly 90 has a cup-shapedcoupling element 70 which is in engagement with thefuel injector body 62 to retain thefuel pipe 24 in thefuel injector 20 in direction of the central longitudinal axis L2. Thecoupling element 70 is formed as a ring element and has a centrally arranged throughhole 72 and ascrew thread 74 which is a female screw thread. Thus, thecoupling element 70 is formed as a nut. - The
fuel injector body 62 has ascrew thread 76 which is a male screw thread. Thefuel injector body 62 and thecoupling element 70 are fixedly coupled with each other by thescrew threads - As the
fuel injector body 62 is in engagement with thefuel pipe 24, and thecoupling element 70 is fixedly coupled to thefuel injector body 62 by thescrew threads fuel pipe 24 is retained in thefuel injector 20 in direction of the central longitudinal axis L2. - A clamp element 78 is coupled to a
cylinder head 84 of thecombustion engine 22. The clamp element 78 has a protrusion which extends in radial direction relative to the longitudinal axis L2 of thefuel injector body 62. The protrusion has an orifice which is designed to take in a fixingelement 80. The fixingelement 80 is designed to rigidly couple the clamp element 78 to thecylinder head 84. The fixingelement 80 is preferably a screw but it may also be of another type as a pin or a bolt as long as it enables a fixed coupling of thefuel injector body 62 to thecylinder head 84. - The clamp element 78 has an
aperture 82 which may receive thepipe 24 to enable a mechanical cooperation between thepipe 24 and thecylinder head 84. Thepipe 24 can limitedly move in theaperture 82 in axial direction relative to thecylinder head 84 to avoid mechanical stress on thepipe 24. - Between the
fuel injector body 62 and the cylinder head 54 adistance element 88 is arranged that may give a fixed distance between thefuel injector body 62 and thecylinder head 84 and receive the fixingelement 80.
Claims (7)
- Fuel rail device (60) of a combustion engine (22), the fuel rail device (60) comprising- a fuel rail (18),- a union (34) having a longitudinal axis (L1), being fixedly coupled to the fuel rail (18) and being in hydraulic communication with the fuel rail (18),- a pipe (24) being partially engaged by the union (34) and being designed to be in hydraulic communication with a fuel injector (20), and- a sealing ring (38) being arranged coaxially to the pipe (24) and being arranged radially between the union (34) and the pipe (24) and being designed to sealingly couple the union (34) to the pipe (24),wherein the pipe (24) has an outer surface (30) comprising a groove (32) facing the union (34), and the sealing ring (38) is partially arranged in the groove (32),
wherein the pipe (24) comprises a tube (26) and a ring holder element (28) which is arranged coaxially to the tube (26) and which is fixedly coupled to the tube (26), and the ring holder element (28) comprises the groove (32), and
wherein a part (49) of the ring holder element (28) extends in axial direction from an axial end (48) of the tube (26) facing the fuel rail (18) in a manner that the ring holder element (28) covers at least partially the axial end (48) of the tube (26). - Fuel rail device (60) in accordance with claim 1, wherein the ring holder element (28) is welded or brazed to the tube (26).
- Fuel rail device (60) in accordance with one of the preceding claims, wherein the union (34) is welded or brazed to the fuel rail (18).
- Fuel rail device (60) in accordance with one of the preceding claims, wherein the pipe (24) comprises a flange (44), and a clip element (46) is arranged coaxially to the pipe (24), and the clip element (46) is in engagement with the union (34) and the flange (44) to prevent an axial movement of the pipe (24) relative to the union (34).
- Fuel rail-fuel injector assembly with a fuel rail device (60) in accordance with one of the preceding claims and a coupling assembly (90) for hydraulically and mechanically coupling a fuel injector (20) to a fuel rail (18) of a combustion engine (22), the coupling assembly (90) comprising- a fuel injector (20) with a fuel injector body (62) and a central longitudinal axis (L2), the fuel injector body (62) comprising a partially cone-shaped cavity (64),- a fuel pipe (24) being hydraulically coupable to the fuel rail (18), and- a cup-shaped coupling element (70) being in engagement with the fuel injector body (62) to retain the fuel pipe (24) in the fuel injector (20) in direction of the central longitudinal axis (L2), whereinthe fuel pipe (24) has a rounded end section (66) which is at least partially arranged in the partially cone-shaped cavity (64) and is in direct contact with the fuel injector body (62), and
wherein the fuel rail device (60) is mechanically and hydraulically coupled to the coupling assembly (90). - Fuel rail-fuel injector assembly in accordance with claim 5, wherein the fuel injector body (62) comprises an outer screw thread (76) and the cup-shaped coupling element (70) comprises an inner screw thread (74) which is in engagement with the outer screw thread (76) of the fuel injector body (62).
- Fuel rail-fuel injector assembly in accordance with claim 5 or 6, wherein a clamp element (78) is fixedly coupled to a cylinder head (84) of the combustion engine (22) and comprises an aperture (82) being designed to engage the fuel pipe (24) to enable a mechanical cooperation between the fuel pipe (24) and the cylinder head (84).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20090008906 EP2284385B1 (en) | 2009-07-07 | 2009-07-07 | Fuel rail device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20090008906 EP2284385B1 (en) | 2009-07-07 | 2009-07-07 | Fuel rail device |
Publications (2)
Publication Number | Publication Date |
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EP2284385A1 EP2284385A1 (en) | 2011-02-16 |
EP2284385B1 true EP2284385B1 (en) | 2014-06-25 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20090008906 Not-in-force EP2284385B1 (en) | 2009-07-07 | 2009-07-07 | Fuel rail device |
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EP (1) | EP2284385B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102013222508B4 (en) * | 2013-11-06 | 2023-07-27 | Robert Bosch Gmbh | Valve for metering fluid under high pressure |
CN107076082B (en) * | 2014-11-19 | 2022-12-20 | 大陆汽车有限公司 | Fuel rail assembly for internal combustion engine |
US10208723B2 (en) | 2016-05-25 | 2019-02-19 | Hi-Vol Products | Threaded fuel rails |
PL3418550T3 (en) | 2017-06-20 | 2020-06-29 | Hi-Vol Products Llc | Threaded fuel rails |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19601496C2 (en) * | 1996-01-17 | 1998-07-30 | Man Nutzfahrzeuge Ag | Connection of an injection line to a pressure pipe of an injection valve |
DE19758817B4 (en) * | 1997-12-17 | 2010-08-26 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Holder for a fuel injection valve on the cylinder head of an internal combustion engine |
DE19933256A1 (en) * | 1999-07-15 | 2001-01-25 | Bosch Gmbh Robert | Connection piece and housing, in particular high-pressure fuel accumulator, with prestressed welded connection piece for a fuel injection system for internal combustion engines |
US6830037B1 (en) * | 2004-01-27 | 2004-12-14 | Delphi Technologies, Inc. | Anti-rotation fuel injector clip |
FR2869367A1 (en) * | 2004-04-21 | 2005-10-28 | Renault Sas | Fuel injection tube and connection piece coupling device for heat engine, has chamber communicating with channel to receive fuel flow from circulation duct, where chamber is at pressure lower than that of fuel in channels |
FR2890123B1 (en) * | 2005-08-29 | 2007-11-23 | Peugeot Citroen Automobiles Sa | DEVICE FOR FIXING AT LEAST ONE INJECTOR ON A CYLINDER HEAD AND INTERNAL COMBUSTION ENGINE COMPRISING SUCH A DEVICE |
DE602006002803D1 (en) * | 2006-02-08 | 2008-10-30 | Siemens Ag | Connecting arrangement for connecting an injector with a fluid supply |
US7406946B1 (en) * | 2007-04-02 | 2008-08-05 | Hitachi, Ltd. | Method and apparatus for attenuating fuel pump noise in a direct injection internal combustion chamber |
EP2188516B1 (en) * | 2007-09-13 | 2011-10-26 | Ganser-Hydromag AG | Fuel injection device |
EP2058509B1 (en) * | 2007-11-12 | 2012-07-18 | Continental Automotive GmbH | Coupling device |
-
2009
- 2009-07-07 EP EP20090008906 patent/EP2284385B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
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EP2284385A1 (en) | 2011-02-16 |
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