EP3283754A2 - Assembly consisting of a cylinder head and a fuel injector - Google Patents
Assembly consisting of a cylinder head and a fuel injectorInfo
- Publication number
- EP3283754A2 EP3283754A2 EP16770672.0A EP16770672A EP3283754A2 EP 3283754 A2 EP3283754 A2 EP 3283754A2 EP 16770672 A EP16770672 A EP 16770672A EP 3283754 A2 EP3283754 A2 EP 3283754A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- heat
- cooling
- cylinder head
- fuel injector
- 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.)
- Withdrawn
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 73
- 238000002485 combustion reaction Methods 0.000 claims abstract description 60
- 238000001816 cooling Methods 0.000 claims description 64
- 239000002826 coolant Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000003380 propellant Substances 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 abstract description 17
- 238000007789 sealing Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
- F02M53/046—Injectors with heating, cooling, or thermally-insulating means with thermally-insulating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/06—Arrangements for cooling other engine or machine parts
- F01P1/10—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/12—Arrangements for cooling other engine or machine parts
- F01P3/16—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
-
- 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
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
-
- 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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
- F02M53/043—Injectors with heating, cooling, or thermally-insulating means with cooling means other than air cooling
-
- 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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
- F02M53/08—Injectors with heating, cooling, or thermally-insulating means with air cooling
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
- F01P2003/2278—Heat pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/12—Other methods of operation
- F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
-
- 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
- F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
- F02M2700/07—Nozzles and injectors with controllable fuel supply
- F02M2700/077—Injectors having cooling or heating means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Definitions
- the invention relates to an arrangement of a cylinder head and a fuel injector for an internal combustion engine having the features of the preamble of claim 1.
- Fuel injectors are used in internal combustion engines to supply fuel to the combustion chambers of the internal combustion engine. For this purpose, a variety of designs for the realization of the metering of fuel are known. Fuel injectors are used both in Otto engines, so spark-ignited internal combustion engines and in internal combustion engines with auto-ignition, that is, in diesel engines or dual-fuel engines. The fuel injectors are often arranged in a bore of the cylinder head. It is also possible to provide the fuel injectors in Injektorhülsen, which in turn are used in the cylinder head of the internal combustion engine.
- the nozzle opening of a fuel injector is exposed to the high temperatures prevailing in the combustion chamber of the internal combustion engine.
- the high temperatures at the nozzle opening of the fuel injector on the one hand load the material of the fuel injector and can lead to its deformation, on the other hand it can lead to the coking of fuel, which in turn impairs the function of the fuel injector.
- a fuel injector wherein an outer peripheral surface of the nozzle shaft tapers and the actual nozzle may be formed surrounding to prevent entry of combustion gases between the nozzle body and injector, thereby heat transfer of combustion gases to the nozzle opening (Injector tip) to reduce.
- a cooling effect of the nozzle opening is thus achieved according to this document in that a conical jacket element surrounds the nozzle body and seals so that no hot combustion gases can penetrate between nozzle sleeve and nozzle opening. To improve the heat dissipation of the nozzle jacket may be formed cooled.
- the generic DE 3 529 769 A1 shows a heat shield plate for mounting between the cylinder head of an internal combustion engine and the nozzle holder of an injection nozzle, consisting of a between the cylinder head and the nozzle holder axially clamped outer, annular portion and an annular portion connected to the inner annular flange, with its free inner end in the region of the injector openings on the nozzle holder abuts approximately sealing.
- the heat shield serves on the one hand to protect the injector from heat and on the other hand as a seal between injector holder and the cylinder head.
- Object of the present invention is to provide an arrangement with reduced heat input to the fuel injector. This object is achieved by an arrangement of a cylinder head and a fuel injector with the features of claim 1. Preferred developments are specified in the dependent claims.
- the heat removal device comprises a heat sink.
- heat sink means a passive heat dissipation device, ie Heat dissipation takes place by heat conduction,
- the components involved such as the heat shield, preferably made of materials with high thermal conductivity.
- the heat removal device comprises a cooling device through which a cooling medium can flow or can be flowed through. According to this embodiment, therefore, there is active cooling via a cooling medium. It is preferably provided that the cooling device comprises cooling channels. By means of cooling channels, the cooling medium can be targeted to the places of heat input.
- the cooling device can be connected via at least one opening with at least one combustion chamber.
- the cooling device preferably via appropriately designed cooling channels, at least one opening to the combustion chamber, through which cooling medium in the combustion chamber can be introduced.
- cooling medium in the combustion chamber can be introduced.
- compressed air can be introduced into the combustion chamber.
- a metering device for example a valve or a diaphragm device, can be provided for introducing cooling medium into the combustion chamber.
- the cooling device can be connected to a fuel source. This opens up the possibility, in the presence of at least one opening of the cooling device to the combustion chamber, to supply fuel via the cooling device to the combustion chamber.
- the cooling medium is a propellant gas or charge air.
- propellant gas or charge air is used to flow through the cooling device or to flow around in order to dissipate heat from the heat shield in this way.
- This can be done for example by a portion of the propellant gas or the charge air of the internal combustion engine is passed through cooling channels through the cooling device.
- propellant gas as the cooling medium, in addition to the cooling, it is possible to introduce fuel into the combustion chamber via this path.
- a connection of the cooling channels is provided with the combustion chamber.
- the cooling device can also be used as a further fuel supply device.
- the cooling device is designed as a liquid cooling.
- the liquid cooling can be formed approximately in the form of cooling channels, which are separate from the cooling system of the cylinder head or connected to the cooling system of the cylinder head.
- the cooling medium may be a separate to the cooling system of the cylinder head medium or be the same medium.
- the cooling medium of the liquid cooling typically water, water-glycol mixture or oil is used.
- a flow connection of the cooling device can be provided in such a way that cooling medium can be introduced into the combustion chamber.
- the introduction of water into the combustion chamber can also reduce the NOx emissions in addition to cooling the heat shield, since the temperatures in the combustion chamber can be reduced by removing the heat of vaporization of the water.
- the cooling device is designed as a heat pipe. If the cooling device is designed as a heat pipe, then the heat dissipation can be effectively carried out without fluid connection to the cooling circuit of the cylinder head.
- the operating principle of a heat pipe itself is known from the prior art.
- a cooling channel may be formed so that at the end facing the heat shield, a cooling medium evaporates and thus absorbs heat from the heat shield.
- the cooling medium condenses again and releases heat, for example, to the cylinder head.
- the heat shield is preferably designed so that the spray angle of the fuel injector is not restricted.
- a particular advantage of the invention is that it is achieved by heat removal from the heat shield that form on the heat shield no local overheating, which can lead to misfires. So to speak, the heat shield can be viewed with a heat dissipation device as a cooled heat shield.
- the invention is particularly suitable for use on dual-fuel internal combustion engines. Since only very small amounts of fuel are injected via the fuel injector in dual-fuel internal combustion engines in the pilot or Zündstrahl- operating state, there is only a small cooling effect of the fuel injector by the fuel.
- the measures included in the invention for reducing the heat input to the fuel injector can be classified as follows.
- the measures can be combined arbitrarily.
- injector sleeve Execution of the fits between fuel injector and injector sleeve or cylinder head and, if present, between injector sleeve and cylinder head:
- the end of the column facing the combustion chamber can be purposefully sealed by design measures in order to reduce the cyclic entry of hot fuel gas and the resulting heat input into the fuel injector.
- FIG. 5 arrangement according to a further embodiment.
- FIG. 6 arrangement according to a further embodiment.
- FIG. 7 arrangement according to a further embodiment.
- Figures 1 to 4 show variants of a heat shield without active cooling device, i.
- the heat dissipation takes place by heat conduction into the cylinder head.
- Variations include the formation of an air gap between the injector sleeve and the fuel injector.
- Figure 1 shows an arrangement of a cylinder head 5 and a fuel injector 1 in a first embodiment in a schematic representation in cross section.
- the fuel injector 1 is only indicated by its contours. Out For reasons of clarity, a representation of the injector components located in the fuel injector 1, such as a nozzle needle, was dispensed with.
- the fuel injector 1 is arranged in an injector sleeve 7 in this embodiment.
- the injector sleeve 7 is mounted in the cylinder head 5 and sealed by means of sealing means 8 with respect to the cylinder head 5.
- the fuel injector 1 in turn is sealed with respect to the injector sleeve 7 with sealing means 6.
- the heat shield 2 is designed according to the invention as a pointing to the injector tip 9, tapered collar.
- the heat shield 2 surrounds the injector tip 9 according to the invention along the entire circumference. In plan view, the heat shield 9 would thus form a circular ring.
- the heat shield 2 surrounds the injector tip 9 in such a way that only the injector tip 9 is exposed to the combustion chamber 4.
- the injector 7 which may be made for example of a good heat conducting material.
- the injector sleeve 7 is partially surrounded in this embodiment by the cooling circuit of the cylinder head 5.
- the heat dissipation from the heat shield 2 is reinforced via the formed in the form of the injector 7 heat dissipation device 3.
- the heat shield 2 and the injector 7 form an integral component.
- the heat shield can also be a component that has been intigrated into the cylinder head, as shown in the further figures.
- Figures 2a and 2b show an arrangement according to another embodiment in two variants.
- the fuel injector 1 is arranged in an injector sleeve 7 in this embodiment.
- the injector sleeve 7 is mounted in the cylinder head 5 and sealed by means of sealing means 8 relative to the cylinder head 5.
- the fuel injector 1 in turn is sealed with respect to the injector sleeve 7 with sealing means 6.
- an air gap 12 is provided between the fuel injector 1 and the injector 7, which extends with respect to the longitudinal axis of the fuel injector 1 from the sealant 6 to the injector tip 9.
- the air gap 12 acts as insulation and minimizes the heat input from the injector sleeve 7 to the fuel injector. 1
- the heat dissipation device 3 is therefore also formed here in the form of the injector 7.
- the heat removal from the heat shield 2 takes place here via heat conduction in the Injektorhülse 7, wherein the heat is delivered analogously to the variant of Figure 1 to the cooling circuit 10 of the cylinder head 5.
- the air gap 12 is open relative to the combustion chamber 4.
- the fuel injector 1 rests on the heat shield 2 in the region of the injector tip 9.
- the air gap 12 is closed relative to the combustion chamber 4. This has the effect that on the one hand no hot gases from the combustion chamber 4 can penetrate into the air gap 12.
- the thermal contact between heat shield 2 and fuel injector 1 has a favorable effect on the temperature distribution of the components involved.
- FIG. 3 shows an arrangement according to a further exemplary embodiment.
- the heat shield 2 is again formed as part of the injector 7.
- the injector 7th It is made of a good heat conducting material. Examples include copper alloys. Again, an air gap 12 may be provided.
- Fuel injectors have a conical section in front of the injector tip in which the fuel injector tapers towards the injector tip. This conical section has an opening angle ⁇ .
- the inclination of the heat shield 2 is chosen so that it follows the contour of the fuel injector 1 in the region of the injector tip 9.
- the opening angle ⁇ of the conical section is selected to be particularly acute, that is, the amount of the opening angle ⁇ is smaller than usual.
- Opening angles ⁇ of less than 130 ° have proven particularly advantageous.
- FIG. 4 shows a further exemplary embodiment.
- the fuel injector 1 is arranged here without an injector directly in the cylinder head 5 and sealed by sealing means 6 with respect to this.
- the heat shield 2 is in this case, as in the previous embodiments, a nozzle tip enclosing collar, the collar is formed in this case by the cylinder head 5 itself.
- the fuel injector 1 is spaced from the cylinder head 5, that is, between the fuel injector 1 and the cylinder head 5 is an air gap 12.
- FIG. 5 shows a further exemplary embodiment.
- the heat shield 2 is also designed here as a collar surrounding the injector tip 9 of the injector sleeve 7.
- the heat dissipation device 3 is formed in this embodiment as a cooling device 1 1 with cooling channels 14, which communicate with the cooling circuit 10 of the cylinder head 5.
- the cooling channels 14 can be flowed through by a cooling medium 13.
- the cooling channel 14 preferably extends in the region of the heat shield 2 as a circumferential annular channel in order to ensure uniform cooling of the heat shield 2.
- the flow of a cooling medium 13 is symbolized by black arrows. Of course, the flow direction can also be reversed than shown.
- the injector sleeve 7 is sealed relative to the cylinder head 5 by means of sealing means 8.
- the fuel injector 1 is sealed with respect to the injector sleeve 7 via sealing means 6. In this embodiment, the fuel injector 1 is spaced from the injector sleeve 7, that is, between the fuel injector 1 and the injector 7 is an air gap 12th
- a medium can be conducted through the air gap 12 in the direction of the combustion chamber 4 to support the cooling effect.
- Suitable media are liquids or gas.
- the introduction of water in addition to the cooling of the heat shield 2 also reduces the NOx emissions, since the temperatures in the combustion chamber 4 can be reduced by removing the heat of vaporization of the water.
- the introduction of the medium takes place via the air gap 12 during the charge exchange so that as little work as possible must be applied against the pressure prevailing in the combustion chamber 4.
- FIG 6 shows an embodiment, according to which the cooling device 1 1 is designed as a heat pipe 15.
- a heat pipe is a cooling system in which a cooling medium circulates with a phase transition adapted to the expected operating temperatures.
- the heat shield 2 facing portion evaporates the cooling medium.
- the cool end in this case, the section facing the cooling circuit 10 of the cylinder head
- the heat is released again with condensation of the cooling medium.
- Figure 7 shows an embodiment in which the cooling channels 14 of the cooling device 1 1 via a valve 16 to the combustion chamber 4 are connectable. As a result, the possibility is created to introduce cooling medium 13 into the combustion chamber 4.
Abstract
The invention relates to an assembly consisting of a cylinder head (5) and a fuel injector (1) for an internal combustion engine comprising at least one combustion chamber, said injector having an injector tip (9). The end of the fuel injector (1) facing the combustion chamber (4) of the internal combustion engine is at least partially surrounded by a heat shield (2), and a heat dissipation device (3), by means of which heat can be dissipated from the combustion chamber (4) of the internal combustion engine, is provided in the region of the heat shield (2). The heat shield (2) surrounds the fuel injector (1) excluding the injector tip (9) and said heat shield (2) is designed as a collar that tapers towards the injector tip (9) and that is integrated into an injector sleeve (7) or the cylinder head (5).
Description
Anordnung aus einem Zylinderkopf und einem Kraftstoffinjektor Arrangement of a cylinder head and a fuel injector
Die Erfindung betrifft eine Anordnung aus einem Zylinderkopf und einem Kraftstoffinjektor für eine Brennkraftmaschine mit den Merkmalen des Oberbegriffs von Anspruch 1 . The invention relates to an arrangement of a cylinder head and a fuel injector for an internal combustion engine having the features of the preamble of claim 1.
Kraftstoffinjektoren werden bei Brennkraftmaschinen eingesetzt, um Kraftstoff den Brennräumen der Brennkraftmaschine zuzuführen. Dazu sind verschiedenste Bauweisen zur Realisierung der Zumessung von Kraftstoff bekannt. Kraftstoffinjektoren werden sowohl in Otto Motoren, also fremdgezündeten Brennkraftmaschinen als auch in Brennkraftmaschinen mit Selbstzündung, das heißt in Dieselmotoren oder Dual-Fuel- Motoren eingesetzt. Die Kraftstoffinjektoren sind häufig in einer Bohrung des Zylinderkopfs angeordnet. Ebenso möglich ist es, die Kraftstoffinjektoren in Injektorhülsen vorzusehen, die wiederum in den Zylinderkopf der Brennkraftmaschine eingesetzt werden. Fuel injectors are used in internal combustion engines to supply fuel to the combustion chambers of the internal combustion engine. For this purpose, a variety of designs for the realization of the metering of fuel are known. Fuel injectors are used both in Otto engines, so spark-ignited internal combustion engines and in internal combustion engines with auto-ignition, that is, in diesel engines or dual-fuel engines. The fuel injectors are often arranged in a bore of the cylinder head. It is also possible to provide the fuel injectors in Injektorhülsen, which in turn are used in the cylinder head of the internal combustion engine.
Die Düsenöffnung eines Kraftstoffinjektors ist den im Brennraum der Brennkraftmaschine herrschenden hohen Temperaturen ausgesetzt. Die hohen Temperaturen an der Düsenöffnung des Kraftstoffinjektors belasten einerseits den Werkstoff des Kraftstoffinjektors und können zu dessen Deformation führen, anderseits kann es zur Verkokung von Kraftstoff kommen, was wiederum die Funktion des Kraftstoffinjektors beeinträchtigt. The nozzle opening of a fuel injector is exposed to the high temperatures prevailing in the combustion chamber of the internal combustion engine. The high temperatures at the nozzle opening of the fuel injector on the one hand load the material of the fuel injector and can lead to its deformation, on the other hand it can lead to the coking of fuel, which in turn impairs the function of the fuel injector.
Daher gibt es Vorschläge, den Injektor und im Speziellen die den Brennraum zugewandte Spitze des Kraftstoffinjektors zu kühlen. Therefore, there are proposals to cool the injector and in particular the fuel injector tip facing the combustion chamber.
Aus der DE 102 34 324 A1 ist etwa ein Kraftstoffinjektor bekannt, wobei eine äußere Umfangsfläche des Düsenschafts verjüngt und die eigentliche Düse umgebend ausgebildet sein kann, um einen Eintritt von Verbrennungsgasen zwischen Düsenkörper und Injektorhülse zu verhindern, um dadurch einen Wärmeübergang von Verbrennungsgasen auf die Düsenöffnung (Injektorspitze) zu vermindern. Eine Kühlwirkung der Düsenöffnung wird gemäß dieser Schrift also erreicht, indem ein konisches Mantelelement den Düsenkörper umschließt und so abdichtet, dass keine heißen Verbrennungsgase zwischen Düsenhülse und Düsenöffnung eindringen können. Zur Verbesserung der Wärmeabfuhr kann der Düsenmantel gekühlt ausgebildet sein.
Die gattungsbildende DE 3 529 769 A1 zeigt eine Wärmeschutzplatte zur Anordnung zwischen dem Zylinderkopf einer Brennkraftmaschine und dem Düsenhalter einer Einspritzdüse, bestehend aus einem zwischen dem Zylinderkopf und dem Düsenhalter axial eingespannten äußeren, ringförmigen Abschnitt und einem mit dem ringförmigen Abschnitt verbundenen inneren Ringflansch, der mit seinem freien inneren Ende im Bereich der Einspritzdüsenöffnungen am Düsenhalter etwa dichtend anliegt. Die Wärmeschutzplatte (Hitzeschild) dient einerseits dazu, die Einspritzdüse vor Wärme zu schützen und zum anderen als Abdichtung zwischen Einspritzdüsenhalter und dem Zylinderkopf. From DE 102 34 324 A1, a fuel injector is known, wherein an outer peripheral surface of the nozzle shaft tapers and the actual nozzle may be formed surrounding to prevent entry of combustion gases between the nozzle body and injector, thereby heat transfer of combustion gases to the nozzle opening (Injector tip) to reduce. A cooling effect of the nozzle opening is thus achieved according to this document in that a conical jacket element surrounds the nozzle body and seals so that no hot combustion gases can penetrate between nozzle sleeve and nozzle opening. To improve the heat dissipation of the nozzle jacket may be formed cooled. The generic DE 3 529 769 A1 shows a heat shield plate for mounting between the cylinder head of an internal combustion engine and the nozzle holder of an injection nozzle, consisting of a between the cylinder head and the nozzle holder axially clamped outer, annular portion and an annular portion connected to the inner annular flange, with its free inner end in the region of the injector openings on the nozzle holder abuts approximately sealing. The heat shield (heat shield) serves on the one hand to protect the injector from heat and on the other hand as a seal between injector holder and the cylinder head.
Nachteilig an den aus dem Stand der Technik bekannten Lösungen ist, dass der Kraftstoffinjektor vor allem im Bereich seiner Spitze gegenüber einem Brennraum der Brennkraftmaschine weitgehend ungeschützt ist, wodurch sich ein großer Wärmeeintrag in den Kraftstoffinjektor ergibt. A disadvantage of the known from the prior art solutions that the fuel injector is largely unprotected, especially in the region of its tip against a combustion chamber of the internal combustion engine, resulting in a large heat input into the fuel injector.
Aufgabe der vorliegenden Erfindung ist es, eine Anordnung mit verringertem Wärmeeintrag auf den Kraftstoff injektor anzugeben. Diese Aufgabe wird gelöst durch eine Anordnung aus einem Zylinderkopf und einem Kraftstoffinjektor mit den Merkmalen von Anspruch 1 . Bevorzugte Weiterbildungen sind in den abhängigen Ansprüchen angegeben. Object of the present invention is to provide an arrangement with reduced heat input to the fuel injector. This object is achieved by an arrangement of a cylinder head and a fuel injector with the features of claim 1. Preferred developments are specified in the dependent claims.
Indem im Bereich des Hitzeschilds eine Wärmeabfuhrvorrichtung vorgesehen ist, die Wärme aus einem Brennraum der Brennkraftmaschine abtransportiert, wird der Wärmeeintrag auf den Kraftstoffinjektor wirksam reduziert. Außerdem wird insbesondere bei Dual-Fuel-Anwendungen verhindert, dass das Hitzeschild selbst zur Quelle von Glühzündungen wird. Es kann vorgesehen sein, dass die Wärmeabfuhrvorrichtung eine Wärmesenke umfasst. Hier ist also vorgesehen, dass Wärme aus dem Brennraum mittels einer Wärmesenke in den Zylinderkopf abgeführt wird, welche (Wärme) ohne diese Maßnahme in den Kraftstoff injektor eingehen würde. Im Kontext der vorliegenden Erfindung ist mit Wärmesenke eine passive Wärmeabfuhrvorrichtung gemeint, d.h. die
Wärmeabfuhr erfolgt durch Wärmeleitung, Dazu werden die beteiligten Komponenten, wie etwa das Hitzeschild, vorzugsweise aus Werkstoffen mit hoher Wärmeleitfähigkeit gefertigt. Bevorzugt kann vorgesehen sein, dass die Wärmeabfuhrvorrichtung eine von einem Kühlmedium durchströmbare oder umströmbare Kühleinrichtung umfasst. Gemäß dieser Ausführungsform besteht hier also eine aktive Kühlung über ein Kühlmedium. Bevorzugt ist vorgesehen, dass die Kühleinrichtung Kühlkanäle umfasst. Mittels Kühlkanälen lässt sich das Kühlmedium gezielt zu den Orten des Wärmeeintrags führen. By providing a heat removal device in the region of the heat shield, which removes heat from a combustion chamber of the internal combustion engine, the heat input to the fuel injector is effectively reduced. In addition, especially in dual-fuel applications prevents the heat shield itself is the source of Glühzündungen. It can be provided that the heat removal device comprises a heat sink. Here it is therefore envisaged that heat is removed from the combustion chamber by means of a heat sink in the cylinder head, which (heat) would go into injector without this measure in the fuel. In the context of the present invention, heat sink means a passive heat dissipation device, ie Heat dissipation takes place by heat conduction, For this purpose, the components involved, such as the heat shield, preferably made of materials with high thermal conductivity. It can preferably be provided that the heat removal device comprises a cooling device through which a cooling medium can flow or can be flowed through. According to this embodiment, therefore, there is active cooling via a cooling medium. It is preferably provided that the cooling device comprises cooling channels. By means of cooling channels, the cooling medium can be targeted to the places of heat input.
Es kann vorgesehen sein, dass die Kühleinrichtung über wenigstens eine Öffnung mit wenigstens einem Brennraum verbindbar ist. Dies beschreibt den Fall, in welchem die Kühleinrichtung in einer Fluidverbindung mit dem Brennraum steht. Es weist also hier die Kühleinrichtung, vorzugsweise über entsprechend ausgestaltete Kühlkanäle, wenigstens eine Öffnung zum Brennraum auf, durch welche Kühlmedium in den Brennraum einbringbar ist. Als nicht-beschränkendes Beispiel kann etwa Druckluft in den Brennraum eingebracht werden. Zur Sicherstellung einer kontrollierten Funktion kann zur Einbringung von Kühlmedium in den Brennraum eine Dosiereinrichtung, etwa ein Ventil oder eine Blendeneinrichtung, vorgesehen sein. It can be provided that the cooling device can be connected via at least one opening with at least one combustion chamber. This describes the case in which the cooling device is in fluid communication with the combustion chamber. Thus, it has here the cooling device, preferably via appropriately designed cooling channels, at least one opening to the combustion chamber, through which cooling medium in the combustion chamber can be introduced. As a non-limiting example, for example, compressed air can be introduced into the combustion chamber. To ensure a controlled function, a metering device, for example a valve or a diaphragm device, can be provided for introducing cooling medium into the combustion chamber.
Es kann vorgesehen sein, dass die Kühleinrichtung mit einer Kraftstoffquelle verbindbar ist. Dies eröffnet die Möglichkeit, bei Vorhandensein wenigstens einer Öffnung der Kühleinrichtung zum Brennraum, Kraftstoff über die Kühleinrichtung dem Brennraum zuzuführen. It can be provided that the cooling device can be connected to a fuel source. This opens up the possibility, in the presence of at least one opening of the cooling device to the combustion chamber, to supply fuel via the cooling device to the combustion chamber.
Es kann vorgesehen sein, dass das Kühlmedium ein Treibgas oder Ladeluft ist. It can be provided that the cooling medium is a propellant gas or charge air.
Gemäß dieser Ausführungsform wird Treibgas bzw. Ladeluft genutzt, um die Kühleinrichtung zu durchströmen oder zu umströmen um auf diese Weise Wärme aus dem Hitzeschild abzuführen. Dies kann beispielsweise erfolgen, indem ein Teil des Treibgases bzw. der Ladeluft der Brennkraftmaschine über Kühlkanäle durch die Kühleinrichtung geleitet wird.
Bei der Verwendung von Treibgas als Kühlmedium besteht zusätzlich zur Kühlung die Möglichkeit über diesen Weg Kraftstoff in den Brennraum einzubringen. Für diesen Fall ist eine Verbindung der Kühlkanäle mit dem Brennraum vorgesehen. According to this embodiment, propellant gas or charge air is used to flow through the cooling device or to flow around in order to dissipate heat from the heat shield in this way. This can be done for example by a portion of the propellant gas or the charge air of the internal combustion engine is passed through cooling channels through the cooling device. When using propellant gas as the cooling medium, in addition to the cooling, it is possible to introduce fuel into the combustion chamber via this path. In this case, a connection of the cooling channels is provided with the combustion chamber.
So kann die Kühleinrichtung auch als weitere Kraftstoffzuführungseinrichtung verwendet werden. Thus, the cooling device can also be used as a further fuel supply device.
Es kann vorgesehen sein, dass die Kühleinrichtung als Flüssigkeitskühlung ausgebildet ist. Die Flüssigkeitskühlung kann dabei etwa in Form von Kühlkanälen ausgebildet sein, die separat zum Kühlsystem des Zylinderkopfes sind oder mit dem Kühlsystem des Zylinderkopfes verbunden sind. Das Kühlmedium kann ein zum Kühlsystem des Zylinderkopfes gesondertes Medium sein oder das gleiche Medium sein. Als Kühlmedium der Flüssigkeitskühlung wird typischerweise Wasser, Wasser-Glykol- Gemisch oder Öl verwendet. It can be provided that the cooling device is designed as a liquid cooling. The liquid cooling can be formed approximately in the form of cooling channels, which are separate from the cooling system of the cylinder head or connected to the cooling system of the cylinder head. The cooling medium may be a separate to the cooling system of the cylinder head medium or be the same medium. As the cooling medium of the liquid cooling typically water, water-glycol mixture or oil is used.
In einer Variante kann eine Strömungsverbindung der Kühleinrichtung solcherart vorgesehen sein, dass Kühlmedium in den Brennraum eingebracht werden kann. In a variant, a flow connection of the cooling device can be provided in such a way that cooling medium can be introduced into the combustion chamber.
Wird etwa Wasser verwendet, so können durch die Einbringung von Wasser in den Brennraum zusätzlich zur Kühlung des Hitzeschildes auch die NOx-Emissionen reduziert werden, da sich durch Entzug der Verdampfungswärme des Wassers die Temperaturen im Brennraum senken lassen. If, for example, water is used, the introduction of water into the combustion chamber can also reduce the NOx emissions in addition to cooling the heat shield, since the temperatures in the combustion chamber can be reduced by removing the heat of vaporization of the water.
Es kann vorgesehen sein, dass die Kühleinrichtung als heat pipe ausgebildet ist. Ist die Kühleinrichtung als heat pipe ausgebildet, so kann die Wärmeabfuhr wirkungsvoll auch ohne Fluidverbindung zum Kühlkreislauf des Zylinderkopfes erfolgen. Das Funktionsprinzip einer heat pipe an sich ist aus dem Stand der Technik bekannt. It can be provided that the cooling device is designed as a heat pipe. If the cooling device is designed as a heat pipe, then the heat dissipation can be effectively carried out without fluid connection to the cooling circuit of the cylinder head. The operating principle of a heat pipe itself is known from the prior art.
Für die Anwendung auf die Wärmeabfuhrvorrichtung der vorliegenden Erfindung kann beispielsweise ein Kühlkanal so ausgebildet sein, dass an dem dem Hitzeschild zugewandten Ende ein Kühlmedium verdampft und so Wärme aus dem Hitzeschild aufnimmt. Am anderen Ende des als heat pipe wirkenden Kühlkanals kondensiert das Kühlmedium wieder und gibt dabei Wärme beispielsweise an den Zylinderkopf ab. For application to the heat removal device of the present invention, for example, a cooling channel may be formed so that at the end facing the heat shield, a cooling medium evaporates and thus absorbs heat from the heat shield. At the other end of the cooling pipe acting as a heat pipe, the cooling medium condenses again and releases heat, for example, to the cylinder head.
Das Hitzeschild ist vorzugsweise so ausgebildet, dass der Spray-Winkel des Kraftstoffinjektors nicht eingeschränkt wird.
Ein besonderer Vorteil der Erfindung liegt darin, dass durch Wärmeabfuhr aus dem Hitzeschild erreicht wird, dass sich am Hitzeschild keine lokalen Überhitzungen ausbilden, die zu Fehlzündungen führen können. Sozusagen kann das Hitzeschild mit einer Wärmeabfuhrvorrichtung als gekühltes Hitzeschild angesehen werden. The heat shield is preferably designed so that the spray angle of the fuel injector is not restricted. A particular advantage of the invention is that it is achieved by heat removal from the heat shield that form on the heat shield no local overheating, which can lead to misfires. So to speak, the heat shield can be viewed with a heat dissipation device as a cooled heat shield.
Die Erfindung ist besonders für den Einsatz an Dual-Fuel-Brennkraftmaschinen geeignet. Da bei Dual-Fuel-Brennkraftmaschinen im Pilot- oder Zündstrahl- Betriebszustand nur sehr geringe Mengen an Kraftstoff über den Kraftstoffinjektor eingedüst werden, besteht hier eine nur geringe Kühlwirkung des Kraftstoffinjektors durch den Kraftstoff. The invention is particularly suitable for use on dual-fuel internal combustion engines. Since only very small amounts of fuel are injected via the fuel injector in dual-fuel internal combustion engines in the pilot or Zündstrahl- operating state, there is only a small cooling effect of the fuel injector by the fuel.
Die von der Erfindung umfassten Maßnahmen zur Verringerung des Wärmeeintrages auf den Kraftstoffinjektor können wie folgt eingeteilt werden. Die Maßnahmen können dabei beliebig kombiniert werden. The measures included in the invention for reducing the heat input to the fuel injector can be classified as follows. The measures can be combined arbitrarily.
Wärmeabfuhr mittels: Heat dissipation via:
• Wärmeleitung (Material mit guter Wärmeleitfähigkeit) • heat conduction (material with good thermal conductivity)
• (erzwungene) Konvektion • (forced) convection
• Heatpipes • heatpipes
Wärmeabfuhr an (Beispiele für Wärmesenken): Heat dissipation to (examples of heat sinks):
• in kältere Regionen des Zylinderkopfes, • in colder regions of the cylinder head,
• an den Kühlkreislauf des Zylinderkopfes, • to the cooling circuit of the cylinder head,
• Ölkreislauf des Zylinderkopfes, • oil circulation of the cylinder head,
• an einen separaten Kühlkreislauf oder • to a separate cooling circuit or
• an ein Betriebsmedium welches anschließend in den Brennraum gelangt: • to an operating medium which then enters the combustion chamber:
- Brenngas - Fuel gas
- Wasser für Wassereinspritzung - Water for water injection
- Druckluft als Teil der Verbrennungsluft - Compressed air as part of the combustion air
Integration des Hitzeschildes in: Integration of the heat shield in:
• Zylinderkopf (ggf. mittels Einsatzteil) oder • Cylinder head (possibly with insert) or
• Injektorhülse
Ausführung der Passungen zwischen Kraftstoffinjektor und Injektorhülse bzw. Zylinderkopf und, falls vorhanden, zwischen Injektorhülse und Zylinderkopf: • injector sleeve Execution of the fits between fuel injector and injector sleeve or cylinder head and, if present, between injector sleeve and cylinder head:
• Optionaler Spalt zur Verhinderung des Wärmeüberganges zwischen den Komponenten • Optional gap to prevent heat transfer between components
• Das dem Brennraum zugewandte Ende der Spalte kann durch konstruktive Maßnahmen gezielt gedichtet werden um das zyklische Eintreten von heißem Brenngas und den daraus resultierenden Wärmeeintrag in den Kraftstoffinjektor zu vermindern. The end of the column facing the combustion chamber can be purposefully sealed by design measures in order to reduce the cyclic entry of hot fuel gas and the resulting heat input into the fuel injector.
Die Erfindung wird anhand der Figuren näher erläutert. The invention will be explained in more detail with reference to FIGS.
Fig. 1 Anordnung aus einem Zylinderkopf und einem Kraftstoffinjektor nach einem ersten Ausführungsbeispiel, 1 arrangement of a cylinder head and a fuel injector according to a first embodiment,
Fig. 2a, 2b Anordnung nach einem weiteren Ausführungsbeispiel in zwei Varianten,2a, 2b arrangement according to another embodiment in two variants,
Fig. 3 Anordnung nach einem zweiten Ausführungsbeispiel, 3 arrangement according to a second embodiment,
Fig. 4 Anordnung nach einem weiteren Ausführungsbeispiel, 4 arrangement according to a further embodiment,
Fig. 5 Anordnung nach einem weiteren Ausführungsbeispiel. Fig. 5 arrangement according to a further embodiment.
Fig. 6 Anordnung nach einem weiteren Ausführungsbeispiel. Fig. 6 arrangement according to a further embodiment.
Fig. 7 Anordnung nach einem weiteren Ausführungsbeispiel. Fig. 7 arrangement according to a further embodiment.
Dabei zeigen Figuren 1 bis 4 Varianten eines Hitzeschildes ohne aktive Kühleinrichtung, d.h. hier erfolgt die Wärmeabfuhr durch Wärmeleitung in den Zylinderkopf. Variationen betreffen unter anderem die Ausbildung eines Luftspaltes zwischen der Injektorhülse und dem Kraftstoffinjektor. Figures 1 to 4 show variants of a heat shield without active cooling device, i. Here, the heat dissipation takes place by heat conduction into the cylinder head. Variations include the formation of an air gap between the injector sleeve and the fuel injector.
In den Varianten gemäß Figuren 5 und 6 ist eine aktive Kühlung gezeigt. In the variants according to FIGS. 5 and 6 active cooling is shown.
In der Variante gemäß Figur 7 ist eine Verbindung der Kühleinrichtung zum Brennraum gezeigt. In the variant according to FIG. 7, a connection of the cooling device to the combustion chamber is shown.
Figur 1 zeigt eine Anordnung aus einem Zylinderkopf 5 und einem Kraftstoffinjektor 1 in einem ersten Ausführungsbeispiel in einer schematischen Darstellung im Querschnitt. Der Kraftstoffinjektor 1 ist dabei lediglich durch seine Konturen angedeutet. Aus
Gründen der Übersichtlichkeit wurde auf eine Darstellung der im Kraftstoffinjektor 1 befindlichen Injektorkomponenten, wie etwa eine Düsennadel, verzichtet. Der Kraftstoffinjektor 1 ist in diesem Ausführungsbeispiel in einer Injektorhülse 7 angeordnet. Die Injektorhülse 7 ist in dem Zylinderkopf 5 montiert und mittels Dichtmittel 8 gegenüber dem Zylinderkopf 5 abgedichtet. Der Kraftstoffinjektor 1 wiederum ist gegenüber der Injektorhülse 7 mit Dichtmitteln 6 abgedichtet. Das Hitzeschild 2 ist erfindungsgemäß als ein sich zur Injektorspitze 9 weisender, sich verjüngender Kragen ausgebildet. Hier als Schnittdarstellung gezeigt, umgibt das Hitzeschild 2 die Injektorspitze 9 erfindungsgemäß entlang des ganzen Umfanges. Im Grundriss würde das Hitzeschild 9 also einen Kreisring bilden. Das Hitzeschild 2 umgibt die Injektorspitze 9 solchermaßen, dass nur die Injektorspitze 9 dem Brennraum 4 ausgesetzt ist. Als Wärmeabfuhreinrichtung 3 wirkt in diesem Fall die Injektorhülse 7, die beispielsweise aus einem gut wärmeleitenden Material hergestellt sein kann. Die Injektorhülse 7 ist in diesem Ausführungsbeispiel abschnittsweise vom Kühlkreislauf des Zylinderkopfes 5 umgeben. Somit wird die Wärmeabfuhr aus dem Hitzeschild 2 über die in Form der Injektorhülse 7 ausgebildeten Wärmeabfuhreinrichtung 3 verstärkt. Figure 1 shows an arrangement of a cylinder head 5 and a fuel injector 1 in a first embodiment in a schematic representation in cross section. The fuel injector 1 is only indicated by its contours. Out For reasons of clarity, a representation of the injector components located in the fuel injector 1, such as a nozzle needle, was dispensed with. The fuel injector 1 is arranged in an injector sleeve 7 in this embodiment. The injector sleeve 7 is mounted in the cylinder head 5 and sealed by means of sealing means 8 with respect to the cylinder head 5. The fuel injector 1 in turn is sealed with respect to the injector sleeve 7 with sealing means 6. The heat shield 2 is designed according to the invention as a pointing to the injector tip 9, tapered collar. Shown here as a sectional view, the heat shield 2 surrounds the injector tip 9 according to the invention along the entire circumference. In plan view, the heat shield 9 would thus form a circular ring. The heat shield 2 surrounds the injector tip 9 in such a way that only the injector tip 9 is exposed to the combustion chamber 4. As a heat dissipation device 3 acts in this case, the injector 7, which may be made for example of a good heat conducting material. The injector sleeve 7 is partially surrounded in this embodiment by the cooling circuit of the cylinder head 5. Thus, the heat dissipation from the heat shield 2 is reinforced via the formed in the form of the injector 7 heat dissipation device 3.
Besonders günstig für die Wärmeabfuhr aus dem Hitzeschild 2 hat sich erwiesen, dass wie im vorliegenden Ausführungsbeispiel, erfindungsgemäß das Hitzeschild 2 und die Injektorhülse 7 ein integrales Bauteil bilden. Das Hitzeschild kann aber auch erfindungsgemäß ein in den Zylinderkopf intigriertes Bauteil sein wie in den weiteren Figuren gezeigt. Particularly favorable for the heat dissipation from the heat shield 2 has been found that, as in the present embodiment, according to the invention, the heat shield 2 and the injector 7 form an integral component. However, according to the invention, the heat shield can also be a component that has been intigrated into the cylinder head, as shown in the further figures.
Figuren 2a und 2b zeigen eine Anordnung nach einem weiteren Ausführungsbeispiel in zwei Varianten. Figures 2a and 2b show an arrangement according to another embodiment in two variants.
Der Kraftstoffinjektor 1 ist in diesem Ausführungsbeispiel in einer Injektorhülse 7 angeordnet. Die Injektorhülse 7 ist im Zylinderkopf 5 montiert und mittels Dichtmittel 8 gegenüber dem Zylinderkopf 5 abgedichtet. Der Kraftstoffinjektor 1 wiederum ist gegenüber der Injektorhülse 7 mit Dichtmitteln 6 abgedichtet. The fuel injector 1 is arranged in an injector sleeve 7 in this embodiment. The injector sleeve 7 is mounted in the cylinder head 5 and sealed by means of sealing means 8 relative to the cylinder head 5. The fuel injector 1 in turn is sealed with respect to the injector sleeve 7 with sealing means 6.
In diesem Ausführungsbeispiel ist zwischen dem Kraftstoffinjektor 1 und der Injektorhülse 7 ein Luftspalt 12 vorgesehen, der sich bezüglich der Längsachse des Kraftstoffinjektors 1 vom Dichtmittel 6 bis hin zur Injektorspitze 9 erstreckt. Der Luftspalt
12 wirkt als Isolierung und minimiert den Wärmeeintrag aus der Injektorhülse 7 auf den Kraftstoffinjektor 1 . Die Wärmeabfuhreinrichtung 3 ist also auch hier in Form der Injektorhülse 7 ausgebildet. Die Wärmeabfuhr aus dem Hitzeschild 2 erfolgt hier über Wärmeleitung in der Injektorhülse 7, wobei die Wärme analog zur Variante gemäß Figur 1 an den Kühlkreislauf 10 des Zylinderkopfs 5 abgegeben wird. In this embodiment, an air gap 12 is provided between the fuel injector 1 and the injector 7, which extends with respect to the longitudinal axis of the fuel injector 1 from the sealant 6 to the injector tip 9. The air gap 12 acts as insulation and minimizes the heat input from the injector sleeve 7 to the fuel injector. 1 The heat dissipation device 3 is therefore also formed here in the form of the injector 7. The heat removal from the heat shield 2 takes place here via heat conduction in the Injektorhülse 7, wherein the heat is delivered analogously to the variant of Figure 1 to the cooling circuit 10 of the cylinder head 5.
In der Variante gemäß Figur 2a ist der Luftspalt 12 gegenüber dem Brennraum 4 geöffnet. In der Variante gemäß Figur 2b liegt der Kraftstoffinjektor 1 im Bereich der Injektorspitze 9 auf dem Hitzeschild 2 auf. Dadurch ist der Luftspalt 12 gegenüber dem Brennraum 4 geschlossen. Dies hat den Effekt, dass einerseits keine heißen Gase aus dem Brennraum 4 in den Luftspalt 12 eindringen können. Zudem wirkt sich die thermische Kontaktierung zwischen Hitzeschild 2 und Kraftstoffinjektor 1 günstig auf die Temperaturverteilung der beteiligten Komponenten aus. In the variant according to FIG. 2 a, the air gap 12 is open relative to the combustion chamber 4. In the variant according to FIG. 2 b, the fuel injector 1 rests on the heat shield 2 in the region of the injector tip 9. As a result, the air gap 12 is closed relative to the combustion chamber 4. This has the effect that on the one hand no hot gases from the combustion chamber 4 can penetrate into the air gap 12. In addition, the thermal contact between heat shield 2 and fuel injector 1 has a favorable effect on the temperature distribution of the components involved.
Figur 3 zeigt eine Anordnung nach einem weiteren Ausführungsbeispiel. FIG. 3 shows an arrangement according to a further exemplary embodiment.
Das Hitzeschild 2 ist wieder als Teil der Injektorhülse 7 ausgebildet. The heat shield 2 is again formed as part of the injector 7.
Als Wärmeabfuhreinrichtung 3 dient wie in den Ausführungsbeispielen gemäß Figuren 1 , 2a und 2b die Injektorhülse 7. Sie ist dazu aus einem gut wärmeleitenden Werkstoff gefertigt. Beispiele dafür sind etwa Kupferlegierungen. Wieder kann ein Luftspalt 12 vorgesehen sein. As heat removal device 3 serves as in the embodiments according to Figures 1, 2a and 2b, the injector 7th It is made of a good heat conducting material. Examples include copper alloys. Again, an air gap 12 may be provided.
Hervorzuheben an der hier gezeigten Ausführungsform ist ein konstruktives Detail von Kraftstoffinjektors 1 und Hitzeschild 2: Emphasizing on the embodiment shown here is a constructive detail of fuel injector 1 and heat shield 2:
Kraftstoffinjektoren weisen vor der Injektorspitze einen konischen Abschnitt auf, in welchem der Kraftstoffinjektor sich zur Injektorspitze hin verjüngt. Dieser konische Abschnitt weist einen Öffnungswinkel α auf. Fuel injectors have a conical section in front of the injector tip in which the fuel injector tapers towards the injector tip. This conical section has an opening angle α.
Die Neigung des Hitzeschildes 2 ist so gewählt, dass es der Kontur des Kraftstoffinjektors 1 im Bereich der Injektorspitze 9 folgt.
Im gezeigten Ausführungsbeispiel ist der Öffnungswinkel α des konischen Abschnitts besonders spitz gewählt, das heißt der Betrag des Öffnungswinkels α ist kleiner als üblich. The inclination of the heat shield 2 is chosen so that it follows the contour of the fuel injector 1 in the region of the injector tip 9. In the illustrated embodiment, the opening angle α of the conical section is selected to be particularly acute, that is, the amount of the opening angle α is smaller than usual.
Dadurch wird eine größere Wandstärke des Hitzeschildes 2 erreicht. Dieser vergrößerte Querschnitt ist vorteilhaft für die Wärmeabfuhr und robuster gegenüber Verschleiß. As a result, a greater wall thickness of the heat shield 2 is achieved. This enlarged cross-section is advantageous for heat dissipation and more robust against wear.
Als besonders vorteilhaft haben sich Öffnungswinkel α von kleiner als 130° herausgestellt. Opening angles α of less than 130 ° have proven particularly advantageous.
Dieses konstruktive Merkmal ist auch auf andere Ausführungsbeispiele der Erfindung anwendbar. Figur 4 zeigt ein weiteres Ausführungsbeispiel. Der Kraftstoffinjektor 1 ist hier ohne eine Injektorhülse direkt im Zylinderkopf 5 angeordnet und über Dichtmittel 6 gegenüber diesem abgedichtet. Das Hitzeschild 2 ist in diesem Fall wie auch in den vorangegangenen Ausführungsbeispielen ein die Düsenspitze umschließender Kragen, wobei der Kragen in diesem Fall durch den Zylinderkopf 5 selbst gebildet ist. Als Wärmeabfuhreinrichtung 3 fungiert hier also der Zylinderkopf 5. In diesem Ausführungsbeispiel ist der Kraftstoffinjektor 1 von dem Zylinderkopf 5 beabstandet, das heißt, zwischen Kraftstoffinjektor 1 und dem Zylinderkopf 5 liegt ein Luftspalt 12. In einer Variante kann das Ausführungsbeispiel auch ohne Luftspalt 12 realisiert werden. Figur 5 zeigt ein weiteres Ausführungsbeispiel. Das Hitzeschild 2 ist auch hier als ein die Injektorspitze 9 umgebender Kragen der Injektorhülse 7 ausgebildet. This constructive feature is also applicable to other embodiments of the invention. FIG. 4 shows a further exemplary embodiment. The fuel injector 1 is arranged here without an injector directly in the cylinder head 5 and sealed by sealing means 6 with respect to this. The heat shield 2 is in this case, as in the previous embodiments, a nozzle tip enclosing collar, the collar is formed in this case by the cylinder head 5 itself. In this embodiment, the fuel injector 1 is spaced from the cylinder head 5, that is, between the fuel injector 1 and the cylinder head 5 is an air gap 12. In a variant, the embodiment can be realized without air gap 12 , FIG. 5 shows a further exemplary embodiment. The heat shield 2 is also designed here as a collar surrounding the injector tip 9 of the injector sleeve 7.
Die Wärmeabfuhreinrichtung 3 ist in diesem Ausführungsbeispiel als Kühleinrichtung 1 1 mit Kühlkanälen 14 ausgebildet, die mit den Kühlkreislauf 10 des Zylinderkopfes 5 kommunizieren. Die Kühlkanäle 14 sind von einem Kühlmedium 13 durchströmbar. Der Kühlkanal 14 verläuft im Bereich des Hitzeschilds 2 vorzugsweise als umfänglicher Ringkanal, um eine gleichmäßige Kühlung des Hitzeschilds 2 zu gewährleisten.
Die Strömung eines Kühlmediums 13 ist durch schwarze Pfeile symbolisiert. Die Strömungsrichtung kann natürlich auch umgekehrt als gezeigt sein. Die Injektorhülse 7 ist gegenüber dem Zylinderkopf 5 mittels Dichtmittel 8 abgedichtet. Der Kraftstoffinjektor 1 ist gegenüber der Injektorhülse 7 über Dichtmittel 6 abgedichtet. In diesem Ausführungsbeispiel ist der Kraftstoffinjektor 1 von der Injektorhülse 7 beabstandet, das heißt, zwischen Kraftstoffinjektor 1 und der Injektorhülse 7 liegt ein Luftspalt 12. The heat dissipation device 3 is formed in this embodiment as a cooling device 1 1 with cooling channels 14, which communicate with the cooling circuit 10 of the cylinder head 5. The cooling channels 14 can be flowed through by a cooling medium 13. The cooling channel 14 preferably extends in the region of the heat shield 2 as a circumferential annular channel in order to ensure uniform cooling of the heat shield 2. The flow of a cooling medium 13 is symbolized by black arrows. Of course, the flow direction can also be reversed than shown. The injector sleeve 7 is sealed relative to the cylinder head 5 by means of sealing means 8. The fuel injector 1 is sealed with respect to the injector sleeve 7 via sealing means 6. In this embodiment, the fuel injector 1 is spaced from the injector sleeve 7, that is, between the fuel injector 1 and the injector 7 is an air gap 12th
Für die Ausführungsbeispiele mit einem Luftspalt 12 zwischen Kraftstoffinjektor 1 und Injektorhülse 7 bzw. zwischen Kraftstoffinjektor 1 und Zylinderkopf 5 gilt, dass zur Unterstützung der Kühlwirkung ein Medium durch den Luftspalt 12 in Richtung Brennraum 4 geleitet werden kann. Als Medium kommen Flüssigkeiten oder Gas in Betracht. For the exemplary embodiments with an air gap 12 between the fuel injector 1 and the injector sleeve 7 or between the fuel injector 1 and the cylinder head 5, a medium can be conducted through the air gap 12 in the direction of the combustion chamber 4 to support the cooling effect. Suitable media are liquids or gas.
Wird etwa Wasser verwendet, so können durch die Einbringung von Wasser zusätzlich zur Kühlung des Hitzeschildes 2 auch die NOx-Emissionen reduziert werden, da sich durch Entzug der Verdampfungswärme des Wassers die Temperaturen im Brennraum 4 senken lassen. If, for example, water is used, the introduction of water in addition to the cooling of the heat shield 2 also reduces the NOx emissions, since the temperatures in the combustion chamber 4 can be reduced by removing the heat of vaporization of the water.
Bei der Verwendung von Treibgas als Medium entsteht der zusätzliche Nutzen, dass über diesen Weg Kraftstoff in den Brennraum 4 eingebracht wird. When using propellant gas as a medium, the additional benefit arises that fuel is introduced into the combustion chamber 4 via this path.
Auch vorstellbar ist die Verwendung von Druckluft als Medium. Also conceivable is the use of compressed air as a medium.
Günstigerweise erfolgt das Einbringen des Mediums über den Luftspalt 12 während des Ladungswechsels so, dass möglichst wenig Arbeit gegen den im Brennraum 4 herrschenden Druck aufgebracht werden muss. Conveniently, the introduction of the medium takes place via the air gap 12 during the charge exchange so that as little work as possible must be applied against the pressure prevailing in the combustion chamber 4.
Figur 6 zeigt ein Ausführungsbeispiel, nach welchem die Kühleinrichtung 1 1 als heat pipe 15 ausgeführt ist. Als heat pipe wird ein Kühlsystem bezeichnet, in welchem ein Kühlmedium mit einem an die zu erwartenden Betriebstemperaturen angepassten Phasenübergang zirkuliert. An dem heißen Ende (in diesem Fall der dem Hitzeschild 2 zugewandte Abschnitt) verdampft das Kühlmedium. An dem kühlen Ende (hier der dem Kühlreislauf 10 des Zylinderkopfes zugewandte Abschnitt) wird die Wärme unter Kondensation des Kühlmediums wieder abgegeben.
Figur 7 zeigt ein Ausführungsbeispiel, worin die Kühlkanäle 14 der Kühleinrichtung 1 1 über ein Ventil 16 mit dem Brennraum 4 verbindbar sind. Hierdurch wird die Möglichkeit geschaffen, Kühlmedium 13 in den Brennraum 4 einzubringen.
Figure 6 shows an embodiment, according to which the cooling device 1 1 is designed as a heat pipe 15. A heat pipe is a cooling system in which a cooling medium circulates with a phase transition adapted to the expected operating temperatures. At the hot end (in this case, the heat shield 2 facing portion) evaporates the cooling medium. At the cool end (in this case, the section facing the cooling circuit 10 of the cylinder head), the heat is released again with condensation of the cooling medium. Figure 7 shows an embodiment in which the cooling channels 14 of the cooling device 1 1 via a valve 16 to the combustion chamber 4 are connectable. As a result, the possibility is created to introduce cooling medium 13 into the combustion chamber 4.
Liste der verwendeten Bezugszeichen: List of reference numbers used:
1 Kraftstoffinjektor 1 fuel injector
2 Hitzeschild 2 heat shield
3 Wärmeabfuhrvorrichtung 3 heat dissipation device
4 Brennraum 4 combustion chamber
5 Zylinderkopf 5 cylinder head
6 Dichtmittel 6 sealant
7 Injektorhülse 7 injector sleeve
8 Dichtung gegenüber Zylinderkopf 5 8 gasket opposite cylinder head 5
9 Injektorspitze 9 injector tip
10 Kühlreislauf des Zylinderkopfes 10 cooling circuit of the cylinder head
11 Kühleinrichtung 11 cooling device
12 Luftspalt 12 air gap
13 Kühlmedium 13 cooling medium
14 Kühlkanäle 14 cooling channels
15 heat pipe 15 heat pipe
16 Ventil 16 valve
α Öffnungswinkel
α opening angle
Claims
Anordnung aus einem Zylinderkopf (5) und einem eine Injektorspitze (9) aufweisenden Kraftstoffinjektor (1 ) für eine Brennkraftmaschine mit wenigstens einem Brennraum, wobei der Kraftstoffinjektor (1 ) an dem einem Brennraum (4) der Brennkraftmaschine zugewandten Ende zumindest teilweise von einem Hitzeschild (2) umgeben ist, wobei im Bereich des Hitzeschilds (2) eine Wärmeabfuhrvorrichtung (3) vorgesehen ist, durch welche Wärme aus dem Brennraum (4) der Brennkraftmaschine abführbar ist, dadurch gekennzeichnet, dass das Hitzeschild (2) den Kraftstoffinjektor (1 ) bis auf die Injektorspitze (9) umgibt, wobei das Hitzeschild (2) als ein sich zur Injektorspitze (9) hin verjüngender Kragen ausgebildet ist und in eine Injektorhülse (7) oder in den Zylinderkopf (5) integriert ist. Arrangement comprising a cylinder head (5) and a fuel injector (1) having an injector tip (9) for an internal combustion engine with at least one combustion chamber, wherein the fuel injector (1) at least partially faces a heat shield at the end facing a combustion chamber (4) of the internal combustion engine (10). 2), wherein in the region of the heat shield (2) a heat removal device (3) is provided, through which heat from the combustion chamber (4) of the internal combustion engine can be discharged, characterized in that the heat shield (2) the fuel injector (1) to on the injector tip (9) surrounds, wherein the heat shield (2) as a to the injector tip (9) towards tapering collar is formed and in an injector (7) or in the cylinder head (5) is integrated.
Anordnung nach Anspruch 1 , dadurch gekennzeichnet, dass die Wärmeabfuhrvorrichtung (3) eine Wärmesenke umfasst. Arrangement according to claim 1, characterized in that the heat removal device (3) comprises a heat sink.
Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Wärmeabfuhrvorrichtung (3) eine von einem Kühlmedium (13) durchströmbare oder umströmbare Kühleinrichtung (1 1 ) umfasst. Arrangement according to claim 1 or 2, characterized in that the heat removal device (3) comprises a cooling medium (13) can be flowed through or umströmbare cooling device (1 1).
Anordnung nach Anspruch 3, dadurch gekennzeichnet, dass die Kühleinrichtung (1 1 ) Kühlkanäle (14) umfasst. Arrangement according to claim 3, characterized in that the cooling device (1 1) comprises cooling channels (14).
Anordnung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Kühleinrichtung (1 1 ) über wenigstens eine Öffnung mit wenigstens einem Brennraum (4) verbindbar ist. Arrangement according to claim 3 or 4, characterized in that the cooling device (1 1) via at least one opening with at least one combustion chamber (4) is connectable.
Anordnung nach wenigstens einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass die Kühleinrichtung (1 1 ) mit einer Kraftstoffquelle verbindbar ist. Arrangement according to at least one of claims 3 to 5, characterized in that the cooling device (1 1) is connectable to a fuel source.
Anordnung nach wenigstens einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass das Kühlmedium (13) ein Treibgas, Luft oder Ladeluft ist.
Arrangement according to at least one of claims 3 to 6, characterized in that the cooling medium (13) is a propellant gas, air or charge air.
8. Anordnung nach wenigstens einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass das Kühimedium (13) Wasser ist. 8. Arrangement according to at least one of claims 3 to 5, characterized in that the cooling medium (13) is water.
9. Anordnung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Kühleinrichtung (1 1 ) als heat pipe (15) ausgebildet ist.
9. Arrangement according to claim 3 or 4, characterized in that the cooling device (1 1) is designed as a heat pipe (15).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA225/2015A AT517054B1 (en) | 2015-04-14 | 2015-04-14 | Arrangement of a cylinder head and a fuel injector |
PCT/AT2016/000035 WO2016164943A2 (en) | 2015-04-14 | 2016-04-08 | Assembly consisting of a cylinder head and a fuel injector |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3283754A2 true EP3283754A2 (en) | 2018-02-21 |
Family
ID=56997280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16770672.0A Withdrawn EP3283754A2 (en) | 2015-04-14 | 2016-04-08 | Assembly consisting of a cylinder head and a fuel injector |
Country Status (5)
Country | Link |
---|---|
US (1) | US10400724B2 (en) |
EP (1) | EP3283754A2 (en) |
CN (1) | CN107567540B (en) |
AT (1) | AT517054B1 (en) |
WO (1) | WO2016164943A2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017202686A1 (en) * | 2017-02-20 | 2018-08-23 | Robert Bosch Gmbh | fuel injector |
DE102018217768A1 (en) * | 2018-10-17 | 2020-04-23 | Robert Bosch Gmbh | Injector arrangement |
CN110005558B (en) * | 2019-03-19 | 2022-06-07 | 上海齐耀动力技术有限公司 | Carbon deposition prevention fuel injection device |
NO346039B1 (en) * | 2019-06-17 | 2022-01-17 | Bergen Engines As | Cooling sleeve for a cylinder head |
DE102020006653A1 (en) * | 2020-10-30 | 2022-05-05 | Daimler Truck AG | Injector sleeve for an injector, as well as injection device and internal combustion engine |
DE102022209622A1 (en) * | 2022-09-14 | 2024-03-14 | Robert Bosch Gesellschaft mit beschränkter Haftung | Gas injector with reduced temperatures at the sealing seat |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US717685A (en) * | 1902-04-15 | 1903-01-06 | Walter N Ickes | Tea-kettle cover. |
GB273211A (en) | 1926-06-24 | 1927-06-30 | Charles Schaer | Improvements in or relating to cooling devices for the fuel injection nozzles of internal combustion engines |
US1805358A (en) | 1927-12-19 | 1931-05-12 | Burn Walter Scott | Fuel valve of internal combustion engines |
GB299635A (en) * | 1927-12-19 | 1928-11-01 | Richardsons Westgarth & Compan | Improvements in and relating to the fuel valves of internal combustion engines |
US1879985A (en) * | 1928-04-13 | 1932-09-27 | Motorenfabrik Deutz Ag | Cooled nozzle for fuel valves in internal combustion engines |
DE585056C (en) | 1929-10-08 | 1933-09-28 | Schweizerische Lokomotiv | Fuel valve for fuel injection engines |
GB446274A (en) | 1934-10-25 | 1936-04-27 | Johannes Miller | Improvements in fuel injection devices for internal combustion engines |
US2322606A (en) | 1940-09-03 | 1943-06-22 | George C Sullivan | Internal combustion engine |
FR1039357A (en) * | 1950-07-18 | 1953-10-06 | Schweizerische Lokomotiv | Fuel nozzle for air-cooled internal combustion engines |
GB762792A (en) * | 1953-04-21 | 1956-12-05 | Nydqvist & Holm Ab | Improvements relating to the cooling of the fuel nozzles of internal combustion engines |
GB755316A (en) | 1953-11-12 | 1956-08-22 | Burmeister & Wains Mot Mask | Fuel injection valves for internal combustion engines |
DE1526709A1 (en) | 1966-01-19 | 1970-03-05 | Maschf Augsburg Nuernberg Ag | Liquid-cooled injection nozzles for internal combustion engines |
DE3404710A1 (en) * | 1984-02-10 | 1985-08-14 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR INJECTING FUEL IN THE COMBUSTION ROOM OF INTERNAL COMBUSTION ENGINES |
DE3529769A1 (en) | 1985-08-20 | 1987-02-26 | Kloeckner Humboldt Deutz Ag | Heat shield |
DE4443861A1 (en) * | 1994-12-09 | 1996-06-13 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
JPH10252610A (en) * | 1997-01-13 | 1998-09-22 | Yamaha Motor Co Ltd | Cylinder injection cylinder |
EP0961024B1 (en) | 1998-05-29 | 2010-01-13 | Wärtsilä Schweiz AG | Fuel injection nozzle |
US7028918B2 (en) | 2001-02-07 | 2006-04-18 | Cummins Engine Company, Inc. | Fuel injector having a nozzle with improved cooling |
JP2004339946A (en) * | 2003-05-13 | 2004-12-02 | Nippon Soken Inc | Fuel injection valve |
US20070235556A1 (en) * | 2006-03-31 | 2007-10-11 | Harmon Michael P | Nozzle assembly |
KR20090012056A (en) * | 2007-07-27 | 2009-02-02 | 베르트질레 슈바이츠 악티엔게젤샤프트 | An injection nozzle for fuel |
JP2010096100A (en) * | 2008-10-16 | 2010-04-30 | Yanmar Co Ltd | Fuel injection nozzle |
US8434457B2 (en) | 2010-06-29 | 2013-05-07 | Caterpillar Inc. | System and method for cooling fuel injectors |
US8480009B2 (en) | 2010-07-30 | 2013-07-09 | Caterpillar Inc. | Large bore fuel system and fuel injector for same |
EP2562399A1 (en) | 2011-08-26 | 2013-02-27 | Caterpillar Motoren GmbH & Co. KG | Pilot injection of dual fuel engines |
AT512667B1 (en) * | 2012-04-05 | 2014-03-15 | Bosch Gmbh Robert | Injection nozzle for injecting media into a combustion chamber |
GB2504517A (en) | 2012-08-01 | 2014-02-05 | Perkins Engines Co Ltd | A sleeve with integrated heat pipes for seating engine components in a cylinder head |
CN202756145U (en) * | 2012-08-23 | 2013-02-27 | 浙江福仕德燃油喷射系统有限公司 | Diesel engine injector nozzle matching part |
AT516620B1 (en) | 2015-04-21 | 2016-07-15 | Ge Jenbacher Gmbh & Co Og | Dual fuel engine |
-
2015
- 2015-04-14 AT ATA225/2015A patent/AT517054B1/en not_active IP Right Cessation
-
2016
- 2016-04-08 EP EP16770672.0A patent/EP3283754A2/en not_active Withdrawn
- 2016-04-08 US US15/564,433 patent/US10400724B2/en active Active
- 2016-04-08 WO PCT/AT2016/000035 patent/WO2016164943A2/en active Application Filing
- 2016-04-08 CN CN201680021757.6A patent/CN107567540B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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AT517054A1 (en) | 2016-10-15 |
AT517054B1 (en) | 2017-02-15 |
CN107567540B (en) | 2020-05-08 |
WO2016164943A3 (en) | 2017-02-09 |
US10400724B2 (en) | 2019-09-03 |
CN107567540A (en) | 2018-01-09 |
US20180142654A1 (en) | 2018-05-24 |
WO2016164943A2 (en) | 2016-10-20 |
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