EP3147493A1 - Fuel injection system - Google Patents
Fuel injection system Download PDFInfo
- Publication number
- EP3147493A1 EP3147493A1 EP16180972.8A EP16180972A EP3147493A1 EP 3147493 A1 EP3147493 A1 EP 3147493A1 EP 16180972 A EP16180972 A EP 16180972A EP 3147493 A1 EP3147493 A1 EP 3147493A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injection
- groove
- combustion chamber
- sealing ring
- valve housing
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 108
- 238000002347 injection Methods 0.000 title claims abstract description 88
- 239000007924 injection Substances 0.000 title claims abstract description 88
- 238000002485 combustion reaction Methods 0.000 claims abstract description 83
- 238000007789 sealing Methods 0.000 claims abstract description 70
- 238000007906 compression Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/242—Arrangement of spark plugs or injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F11/00—Arrangements of sealings in combustion engines
- F02F11/002—Arrangements of sealings in combustion engines involving cylinder heads
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/09—Fuel-injection apparatus having means for reducing noise
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/85—Mounting of fuel injection apparatus
- F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine
Definitions
- the invention relates to a fuel injection device according to the preamble of the main claim.
- FIG. 1 an example of a known from the prior art fuel injection device is shown in which in a receiving bore of a cylinder head of an internal combustion engine, a fuel injection valve incorporated therein is provided.
- intermediate elements as support elements in the form of washers or similar. placed on a shoulder of the receiving bore of the cylinder head.
- the fuel injector is particularly suitable for use in fuel injection systems of mixture-compression spark-ignition internal combustion engines.
- intermediate element and various types of decoupling and / or damping elements can be used at this installation point. Facing the combustion chamber and the combustion chamber facing away from the groove for a sealing ring serving to seal the fuel injection valve with respect to the combustion chamber gases, the valve housing is designed with one and the same outer diameter.
- the fuel injection device according to the invention with the characterizing features of claim 1 has the advantage that it allows low-noise and bending stress-reduced tilting of a fuel injection valve with the greatest possible tolerance independence.
- the fuel injection device comprises at least one fuel injection valve and a receiving bore in a cylinder head for the fuel injection valve, wherein on the outer circumference of the fuel injection valve, a sealing ring is provided in a groove of a valve housing, which serves to seal the fuel injection valve with respect to the receiving bore.
- the valve housing has in an advantageous manner directly away from the combustion chamber the groove for the sealing ring has a smaller outer diameter than the outer diameter directly facing the combustion chamber of the groove for the sealing ring.
- the outer diameter of the valve housing is immediately turned away from the combustion chamber of the groove for the sealing ring chosen so that taking into account the most extreme tolerance design of valve housing outer diameter and inner diameter of the receiving bore just no metallic contact of the fuel injector brennraumabgewandt the groove for the sealing ring on the wall of the receiving bore at maximum possible Tilting of the fuel injection valve is present.
- a sealing ring which is calibrated in the groove all the way to the front of the combustion chamber offers the advantage of avoiding the penetration of combustion chamber gases into the groove region, since no harmful dead spaces are formed in the groove region in this way, so that in addition to the critical destruction effects, undesired pumping or suction effects are avoided. Due to the calibration of the sealing ring towards the front groove flank, it is possible to dispense with an upper groove flank facing away from the combustion chamber and continue the groove base diameter even immediately as the outer diameter of the valve housing away from the combustion chamber.
- FIG. 1 a valve in the form of an injection valve 1 for fuel injection systems of mixture-compression spark-ignited internal combustion engines in a side view.
- the fuel injection valve 1 is part of the fuel injection device.
- the fuel injection valve 1 which is designed in the form of a direct-injection injector for injecting fuel directly into a combustion chamber 17 of the internal combustion engine, is installed in a receiving bore 20 of a cylinder head 9.
- a sealing ring 2, in particular Teflon TM, ensures optimum sealing of the fuel injection valve 1 with respect to the wall of the receiving bore 20 of the cylinder head.
- a flat intermediate element 24 is inserted, which is designed as a support element in the form of a washer.
- the fuel injection valve 1 has at its inlet-side end 3 a plug connection to a fuel distributor line (fuel rail) 4, which is sealed by a sealing ring 5 between a connection piece 6 of the fuel distributor line 4, which is shown in section, and an inlet connection 7 of the fuel injection valve 1.
- the fuel injection valve 1 is inserted into a receiving opening 12 of the connection piece 6 of the fuel distribution line 4.
- the connecting piece 6 is in this case e.g. in one piece from the actual fuel distributor line 4 and has upstream of the receiving opening 12 a smaller diameter flow opening 15 through which the flow of the fuel injection valve 1 takes place.
- the fuel injection valve 1 has an electrical connection plug 8 for the electrical contacting for actuating the fuel injection valve 1.
- a holding-down device 10 is provided between the fuel injection valve 1 and the connecting piece 6.
- the hold-down 10 is designed as a bow-shaped component, for example as a stamped and bent part.
- the hold-down device 10 has a part-ring-shaped base element 11, from which a hold-down bar 13, which is bent at a downstream end face 14 of the Connecting piece 6 is applied to the fuel rail 4 in the installed state.
- the object of the invention is to achieve over the known installation solutions of provided for the direct injection fuel injection valves in receiving bores of cylinder heads in a simple way improved Verkippungsity for the fuel injector 1 to produce the individual components tolerancesunrounder simplified and greater deviations from the escape Axes of the connecting piece 6 of the fuel rail 4, the fuel injection valve 1 and the receiving bore 20 of the cylinder head 9 to compensate.
- the valve housing 22 of the fuel injection valve 1 with one and the same outer diameter is usually designed facing away from the combustion chamber and away from the combustion chamber from the groove for the sealing ring 2 serving to seal the fuel injection valve 1 with respect to the combustion chamber gases. So that is the very narrow gap between the fuel injection valve 1 and the receiving bore 20 combustion chamber facing the sealing ring 2 to avoid the penetration of harmful combustion chamber gases away from the combustion chamber, so maintained above the sealing ring 2 in its small gap width. As a result, a tilting of the fuel injection valve 1, without the valve housing 22, the wall of the receiving bore 20 in the region of the sealing ring 2 touched on both sides, severely limited.
- the fuel injection device according to the invention is characterized in that the valve housing 22 directly from the combustion chamber facing away from the groove for the sealing ring 2 has a smaller outer diameter than the outer diameter directly facing the combustion chamber of the groove for the sealing ring 2, as in FIG. 2 is shown.
- a fuel injection valve 1 is provided in a receiving bore 20 of a cylinder head 9, which according to the invention has a valve housing 22, which allows a stronger tilting of the fuel injection valve 1 in the cylinder head 9 by its optimized outer geometry, without that Valve housing 22, the receiving bore 20 of the cylinder head 9 touches metal on both sides.
- sealing ring 2 in the FIG. 2 and all other figures having a larger outer diameter than the inner diameter of the receiving bore 20 is shown to illustrate that the sealing ring 2 before installation in the receiving bore 20 in fact has a larger diameter, of course, when installed on the inner diameter of the receiving bore 20 is reduced and calibrated for optimal sealing. The best installation position of the sealing ring 2 will be discussed later.
- FIG. 3 and 4 are corresponding in a detail view FIG. 2 the known solution ( FIG. 3 ) compared to the solution according to the invention ( FIG. 4 ) with an illustration of the tilting possibilities of the fuel injection valves 2.
- the receiving bore 20 usually extends, for manufacturing reasons and to prevent the penetration of harmful combustion chamber gases, in the region of the groove for the sealing ring 2 and the valve housing 22 both immediately away from the combustion chamber and combustion chamber facing the groove on the fuel injector 1 cylindrical with a constant inner diameter. Next brennraumabgewandt the receiving bore 20 then extends, for example, flared to optimally introduce the fuel injector 1, as the FIGS. 1 to 6 clarify.
- the radial distance between the valve housing 22 and the receiving bore 20 directly brennraumabgewandt the groove for the sealing ring 2 is greater than the radial distance between the valve housing 22 and the
- the radial distance between the valve housing 22 and the receiving bore 20 directly brennraumabgewandt the groove for the sealing ring 2 is greater than the radial distance between the valve housing 22 and the receiving bore 20 of the combustion chamber facing the Groove for the sealing ring 2 along the entire length to an edge at which the combustion chamber 17 begins.
- the valve housing 22 is shown in multiple combustion chamber facing the sealing ring 2.
- valve housing 22 of the fuel injection valve 1 of the combustion chamber facing the groove for the sealing ring 2 in the outer diameter constant or single or multiple stages over the entire length up to an edge at which the combustion chamber 17 begins, executed and the outer diameter of the valve housing 22nd facing away from the combustion chamber the groove for the sealing ring 2 is smaller than each outer diameter of the valve housing 22 facing the combustion chamber of the groove for the sealing ring 2 up to the edge at which the combustion chamber 17 begins.
- the gap width between the valve housing 22 of the fuel injection valve 1 and the wall of the receiving bore 20 is facing the combustion chamber of the sealing ring 2 typically only 50 to 100 microns, to avoid that combustion chamber gases penetrate further into the receiving bore 20.
- a typical dimension for a fuel injector 1 for direct injection of fuel into a combustion chamber 17 for the outer diameter is 7.5 mm in the region of the discharge-side end. For example, a tolerance of +/- 50 ⁇ m must be observed.
- For the receiving bore 20 of the cylinder head 9 would be for the inner diameter corresponding to a typical value of 7.65 mm with a tolerance of +/- 25 microns.
- the outer diameter of the valve housing 22 is directly from the combustion chamber facing away from the groove for the sealing ring 2 by 1 to 10% made smaller than the outer diameter directly facing the combustion chamber the groove for the sealing ring 2.
- a concrete example provides that the outer diameter of the valve housing 22 facing away from the combustion chamber in relation to the above example is 7.3 mm. Tolerance related should therefore be avoided at the smallest receiving bore 20 and the largest valve housing 22 is still a metallic contact of the fuel injector 1 brennraumabgewandt the groove for the sealing ring 2 on the wall of the receiving bore 20.
- the outer diameter of the valve housing 22 is directly away from the combustion chamber groove of the sealing ring 2 chosen so that taking into account the most extreme tolerance design of valve housing outer diameter and inner diameter of the receiving bore 20 just no metallic contact of the fuel injector 1 brennraumabgewandt the groove for the sealing ring 2 on the wall the receiving bore 20 is present at maximum possible tilting of the fuel injection valve 1.
- the outer diameter of the valve housing 22 is directly combustion chamber facing away from the groove for the sealing ring 2 while 1 to 10% smaller than each of the outer diameter of the valve housing 22 combustion chamber facing the groove for the sealing ring 2 along the entire length to an edge at which the Combustion chamber 17 begins.
- the fuel injector according to the invention may be designed so that the valve housing 22 directly away from the combustion chamber of the groove for the sealing ring 2 has a tapering away from the groove tapered outer geometry, like this FIG. 5 with a second embodiment in a detailed view of the combustion chamber end of the fuel injection valve 1 shows.
- the conicity of the valve housing 22 is not shown to scale, since the angle of the predominantlygeometriesäge in reality may be ⁇ 1 ° and this would not be recognizable represented.
- FIG. 6 It is clear that the groove for the sealing ring 2 on the valve housing 22 has a groove bottom with a diameter which continues as the outer diameter of the valve housing 22 away from the combustion chamber , So that no upper groove flank exists and the outer geometry of the valve housing 22 is particularly easy to produce. In this case, a maximum tilt of the fuel injection valve 1 without metallic contact brennraumabgewandt the groove for the sealing ring 2 unrestricted possible.
- sealing ring 2 is not in the installed state of the fuel injection valve 1, not as shown sitting in the middle of the groove, but is seated on the lower combustion chamber facing groove flank of the groove.
- a sealing ring 2 which is calibrated in the groove completely towards the combustion chamber 17 offers the advantage of the best possible prevention of the penetration of combustion chamber gases into the groove area, since no harmful dead spaces are formed in the groove area in this way, so that in addition to the destruction effects also undesirable pumping or Suction effects are avoided.
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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)
Abstract
Die erfindungsgemäße Brennstoffeinspritzvorrichtung zeichnet sich besonders dadurch aus, dass sie geräuscharme Verkippungen eines Brennstoffeinspritzventils (1) mit größtmöglicher Toleranzunabhängigkeit erlaubt. Die Brennstoffeinspritzvorrichtung umfasst wenigstens ein Brennstoffeinspritzventil (1) und eine Aufnahmebohrung (20) in einem Zylinderkopf (9) für das Brennstoffeinspritzventil (1), wobei am Außenumfang des Brennstoffeinspritzventils (1) ein Dichtring (2) in einer Nut eines Ventilgehäuses (22) vorgesehen ist, der der Abdichtung des Brennstoffeinspritzventils (1) gegenüber der Aufnahmebohrung (20) dient. Das Ventilgehäuse (22) weist unmittelbar brennraumabgewandt der Nut für den Dichtring (2) einen kleineren Außendurchmesser auf als den Außendurchmesser unmittelbar brennraumzugewandt der Nut für den Dichtring (2). Die Brennstoffeinspritzvorrichtung eignet sich besonders zum direkten Einspritzen von Brennstoff in einen Brennraum einer gemischverdichtenden fremdgezündeten Brennkraftmaschine.The fuel injection device according to the invention is characterized in particular by the fact that it allows low-noise tilting of a fuel injection valve (1) with the greatest possible tolerance independence. The fuel injection device comprises at least one fuel injection valve (1) and a receiving bore (20) in a cylinder head (9) for the fuel injection valve (1), wherein on the outer circumference of the fuel injection valve (1) a sealing ring (2) in a groove of a valve housing (22) is, which serves to seal the fuel injection valve (1) relative to the receiving bore (20). The valve housing (22) has, directly away from the combustion chamber, the groove for the sealing ring (2) a smaller outer diameter than the outer diameter directly facing the combustion chamber of the groove for the sealing ring (2). The fuel injector is particularly suitable for injecting fuel directly into a combustion chamber of a mixture-compression spark-ignition internal combustion engine.
Description
Die Erfindung geht aus von einer Brennstoffeinspritzvorrichtung nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection device according to the preamble of the main claim.
In der
Die erfindungsgemäße Brennstoffeinspritzvorrichtung mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, dass sie geräuscharme und biegespannungsreduzierte Verkippungen eines Brennstoffeinspritzventils mit größtmöglicher Toleranzunabhängigkeit erlaubt. Die Brennstoffeinspritzvorrichtung umfasst wenigstens ein Brennstoffeinspritzventil und eine Aufnahmebohrung in einem Zylinderkopf für das Brennstoffeinspritzventil, wobei am Außenumfang des Brennstoffeinspritzventils ein Dichtring in einer Nut eines Ventilgehäuses vorgesehen ist, der der Abdichtung des Brennstoffeinspritzventils gegenüber der Aufnahmebohrung dient. Das Ventilgehäuse weist in vorteilhafter Weise unmittelbar brennraumabgewandt der Nut für den Dichtring einen kleineren Außendurchmesser auf als den Außendurchmesser unmittelbar brennraumzugewandt der Nut für den Dichtring. Idealerweise ist der Außendurchmesser für das Ventilgehäuse unmittelbar brennraumabgewandt der Nut für den Dichtring genau so gewählt, dass unter Berücksichtigung der extremsten Toleranzauslegung von Ventilgehäuseaußendurchmesser und Innendurchmesser der Aufnahmebohrung gerade kein metallischer Kontakt des Brennstoffeinspritzventils brennraumabgewandt der Nut für den Dichtring an der Wandung der Aufnahmebohrung bei maximal möglicher Verkippung des Brennstoffeinspritzventils vorliegt.The fuel injection device according to the invention with the characterizing features of
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Brennstoffeinspritzvorrichtung möglich.The measures listed in the dependent claims advantageous refinements and improvements of the
Besonders vorteilhaft ist es, den Dichtring im eingebauten Zustand des Brennstoffeinspritzventils auf der unteren brennraumzugewandten Nutflanke der Nut aufsitzen zu lassen. Ein ganz nach vorn zum Brennraum hin in der Nut kalibrierter Dichtring bietet den Vorteil der bestmöglichen Vermeidung des Eindringens von Brennraumgasen in den Nutbereich, da auf diese Weise keine schädlichen Toträume im Nutbereich gebildet sind, so dass neben den kritischen Zerstörungseffekten auch unerwünschte Pump- oder Saugeffekte vermieden sind. Durch die Kalibrierung des Dichtrings zur vorderen Nutflanke hin ist es ermöglicht, auf eine obere, brennraumabgewandte Nutflanke ganz zu verzichten und den Nutgrunddurchmesser sogar unmittelbar als Außendurchmesser des Ventilgehäuses brennraumabgewandt fortzusetzen.It is particularly advantageous to leave the sealing ring in the installed state of the fuel injection valve on the lower groove side of the groove facing the combustion chamber. A sealing ring which is calibrated in the groove all the way to the front of the combustion chamber offers the advantage of avoiding the penetration of combustion chamber gases into the groove region, since no harmful dead spaces are formed in the groove region in this way, so that in addition to the critical destruction effects, undesired pumping or suction effects are avoided. Due to the calibration of the sealing ring towards the front groove flank, it is possible to dispense with an upper groove flank facing away from the combustion chamber and continue the groove base diameter even immediately as the outer diameter of the valve housing away from the combustion chamber.
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen
-
eine teilweise dargestellte Brennstoffeinspritzvorrichtung in einer bekannten Ausführung,Figur 1 -
eine erfindungsgemäß ausgeführte Brennstoffeinspritzvorrichtung in einer ersten Ausführung in einer Detailansicht des brennraumseitigen Endes des Brennstoffeinspritzventils,Figur 2 -
undFiguren 34 in einerDetailansicht entsprechend Figur 2 die bekannte Lösung (Figur 3 ) im Vergleich zur erfindungsgemäßen Lösung (Figur 4 ) mit einer Verdeutlichung der Verkippungsmöglichkeiten der Brennstoffeinspritzventile, -
eine erfindungsgemäß ausgeführte Brennstoffeinspritzvorrichtung in einer zweiten Ausführung in einer Detailansicht des brennraumseitigen Endes des Brennstoffeinspritzventils undFigur 5 -
eine erfindungsgemäß ausgeführte Brennstoffeinspritzvorrichtung in einer dritten Ausführung in einer Detailansicht des brennraumseitigen Endes des Brennstoffeinspritzventils.Figur 6
-
FIG. 1 a partially illustrated fuel injector in a known embodiment, -
FIG. 2 a fuel injection device according to the invention in a first embodiment in a detailed view of the combustion chamber end of the fuel injection valve, -
Figures 3 and4 in a detailed view accordinglyFIG. 2 the known solution (FIG. 3 ) compared to the solution according to the invention (FIG. 4 ) with an illustration of the tilting possibilities of the fuel injection valves, -
FIG. 5 a fuel injection device according to the invention executed in a second embodiment in a detailed view of the combustion chamber end of the fuel injection valve and -
FIG. 6 a fuel injection device according to the invention in a third embodiment in a detailed view of the combustion chamber end of the fuel injection valve.
Zum Verständnis der Erfindung wird im Folgenden anhand der
Zwischen einem Absatz 21 eines Ventilgehäuses 22 und einer z.B. rechtwinklig zur Längserstreckung der Aufnahmebohrung 20 verlaufenden Schulter 23 der Aufnahmebohrung 20 ist ein flaches Zwischenelement 24 eingelegt, das als Abstützelement in Form einer Unterlegscheibe ausgeführt ist. Mit Hilfe eines solchen Zwischenelements 24 werden Fertigungs- und Montagetoleranzen ausgeglichen und eine querkraftfreie Lagerung auch bei leichter Schiefstellung des Brennstoffeinspritzventils 1 sichergestellt.Between a
Das Brennstoffeinspritzventil 1 weist an seinem zulaufseitigen Ende 3 eine Steckverbindung zu einer Brennstoffverteilerleitung (Fuel Rail) 4 auf, die durch einen Dichtring 5 zwischen einem Anschlussstutzen 6 der Brennstoffverteilerleitung 4, der im Schnitt dargestellt ist, und einem Zulaufstutzen 7 des Brennstoffeinspritzventils 1 abgedichtet ist. Das Brennstoffeinspritzventil 1 ist in eine Aufnahmeöffnung 12 des Anschlussstutzens 6 der Brennstoffverteilerleitung 4 eingeschoben. Der Anschlussstutzen 6 geht dabei z.B. einteilig aus der eigentlichen Brennstoffverteilerleitung 4 hervor und besitzt stromaufwärts der Aufnahmeöffnung 12 eine durchmesserkleinere Strömungsöffnung 15, über die die Anströmung des Brennstoffeinspritzventils 1 erfolgt. Das Brennstoffeinspritzventil 1 verfügt über einen elektrischen Anschlussstecker 8 für die elektrische Kontaktierung zur Betätigung des Brennstoffeinspritzventils 1.The
Um das Brennstoffeinspritzventil 1 und die Brennstoffverteilerleitung 4 weitgehend radialkraftfrei voneinander zu beabstanden und das Brennstoffeinspritzventil 1 sicher in der Aufnahmebohrung 20 des Zylinderkopfes 9 niederzuhalten, ist ein Niederhalter 10 zwischen dem Brennstoffeinspritzventil 1 und dem Anschlussstutzen 6 vorgesehen. Der Niederhalter 10 ist als bügelförmiges Bauteil ausgeführt, z.B. als Stanz-Biege-Teil. Der Niederhalter 10 weist ein teilringförmiges Grundelement 11 auf, von dem aus abgebogen ein Niederhaltebügel 13 verläuft, der an einer stromabwärtigen Endfläche 14 des Anschlussstutzens 6 an der Brennstoffverteilerleitung 4 im eingebauten Zustand anliegt.In order to space the
Aufgabe der Erfindung ist es, gegenüber den bekannten Einbaulösungen von für die Direkteinspritzung vorgesehenen Brennstoffeinspritzventilen in Aufnahmebohrungen von Zylinderköpfen auf einfache Art und Weise verbesserte Verkippungsmöglichkeiten für das Brennstoffeinspritzventil 1 zu erreichen, um die einzelnen Bauteile toleranzunempfindlicher vereinfacht herstellen zu können und größere Abweichungen von der Flucht der Achsen des Anschlussstutzens 6 der Brennstoffverteilerleitung 4, des Brennstoffeinspritzventils 1 sowie der Aufnahmebohrung 20 des Zylinderkopfes 9 ausgleichen zu können.The object of the invention is to achieve over the known installation solutions of provided for the direct injection fuel injection valves in receiving bores of cylinder heads in a simple way improved Verkippungsmöglichkeiten for the
Wie in
Im Gegensatz dazu zeichnet sich die erfindungsgemäße Brennstoffeinspritzvorrichtung dadurch aus, dass das Ventilgehäuse 22 unmittelbar brennraumabgewandt der Nut für den Dichtring 2 einen kleineren Außendurchmesser aufweist als den Außendurchmesser unmittelbar brennraumzugewandt der Nut für den Dichtring 2, wie dies in
Es sei an dieser Stelle angemerkt, dass der Dichtring 2 in der
In den
Die Aufnahmebohrung 20 verläuft üblicherweise, aus herstellungstechnischen Gründen und zur Vermeidung des Eindringens von schädlichen Brennraumgasen, im Bereich der Nut für den Dichtring 2 sowie des Ventilgehäuses 22 sowohl unmittelbar brennraumabgewandt als auch brennraumzugewandt der Nut am Brennstoffeinspritzventil 1 zylindrisch mit einem konstanten Innendurchmesser. Weiter brennraumabgewandt verläuft die Aufnahmebohrung 20 dann beispielsweise konisch erweitert, um das Brennstoffeinspritzventil 1 optimal einführen zu können, wie das die
Durch die erfindungsgemäße Maßnahme der Reduzierung des Außendurchmessers des Ventilgehäuses 22 unmittelbar brennraumabgewandt der Nut für den Dichtring 2 ist der radiale Abstand zwischen dem Ventilgehäuse 22 und der Aufnahmebohrung 20 unmittelbar brennraumabgewandt der Nut für den Dichtring 2 größer als der radiale Abstand zwischen dem Ventilgehäuse 22 und der Aufnahmebohrung 20 unmittelbar brennraumzugewandt der Nut für den Dichtring 2. Dabei ist in idealer Weise der radiale Abstand zwischen dem Ventilgehäuse 22 und der Aufnahmebohrung 20 unmittelbar brennraumabgewandt der Nut für den Dichtring 2 größer als der radiale Abstand zwischen dem Ventilgehäuse 22 und der Aufnahmebohrung 20 brennraumzugewandt der Nut für den Dichtring 2 auf der ganzen Länge bis zu einer Kante, an der der Brennraum 17 beginnt. In allen Figuren ist das Ventilgehäuse 22 brennraumzugewandt des Dichtrings 2 mehrfach gestuft dargestellt. Allerdings gilt, dass das Ventilgehäuse 22 des Brennstoffeinspritzventils 1 brennraumzugewandt der Nut für den Dichtring 2 im Außendurchmesser konstant oder einfach oder mehrfach gestuft auf der ganzen Länge bis zu einer Kante, an der der Brennraum 17 beginnt, ausgeführt sein kann und der Außendurchmesser des Ventilgehäuses 22 unmittelbar brennraumabgewandt der Nut für den Dichtring 2 kleiner ist als jeder Außendurchmesser des Ventilgehäuses 22 brennraumzugewandt der Nut für den Dichtring 2 bis zu der Kante, an der der Brennraum 17 beginnt.By the inventive measure the reduction of the outer diameter of the
Die Spaltbreite zwischen dem Ventilgehäuse 22 des Brennstoffeinspritzventils 1 und der Wandung der Aufnahmebohrung 20 beträgt brennraumzugewandt des Dichtrings 2 typischerweise nur 50 bis 100 µm, um zu vermeiden, dass Brennraumgase in die Aufnahmebohrung 20 weiter eindringen. Eine typische Abmessung für ein Brennstoffeinspritzventil 1 zur Direkteinspritzung von Brennstoff in einen Brennraum 17 ist für den Außendurchmesser 7,5 mm im Bereich des abspritzseitigen Endes. Dabei ist z.B. eine Toleranz von +/- 50 µm einzuhalten. Für die Aufnahmebohrung 20 des Zylinderkopfes 9 wäre für den Innendurchmesser entsprechend ein typischer Wert von 7,65 mm mit einer Toleranz von +/- 25 µm.The gap width between the
Um eine metallische Verkantung und eine zweiseitige metallische Anlage bereits bei sehr kleinen Verkippungswinkeln des Brennstoffeinspritzventils 1 in der Aufnahmebohrung 20 zu vermeiden, ist der Außendurchmesser des Ventilgehäuses 22 unmittelbar brennraumabgewandt der Nut für den Dichtring 2 um 1 bis 10 % kleiner ausgeführt als der Außendurchmesser unmittelbar brennraumzugewandt der Nut für den Dichtring 2. Ein konkretes Beispiel sieht vor, dass der Außendurchmesser des Ventilgehäuses 22 brennraumabgewandt bezogen auf das obige Beispiel 7,3 mm beträgt. Toleranzbezogen soll also bei kleinster Aufnahmebohrung 20 und größtem Ventilgehäuse 22 immer noch ein metallischer Kontakt des Brennstoffeinspritzventils 1 brennraumabgewandt der Nut für den Dichtring 2 an der Wandung der Aufnahmebohrung 20 vermieden sein. Idealerweise ist der Außendurchmesser für das Ventilgehäuse 22 unmittelbar brennraumabgewandt der Nut für den Dichtring 2 genau so gewählt, dass unter Berücksichtigung der extremsten Toleranzauslegung von Ventilgehäuseaußendurchmesser und Innendurchmesser der Aufnahmebohrung 20 gerade kein metallischer Kontakt des Brennstoffeinspritzventils 1 brennraumabgewandt der Nut für den Dichtring 2 an der Wandung der Aufnahmebohrung 20 bei maximal möglicher Verkippung des Brennstoffeinspritzventils 1 vorliegt.In order to avoid a metallic tilting and a two-sided metallic system even at very small tilt angles of the
Wie
Zur noch sichereren Auslegung kann erfindungsgemäß die Brennstoffeinspritzvorrichtung so ausgeführt sein, dass das Ventilgehäuse 22 unmittelbar brennraumabgewandt der Nut für den Dichtring 2 eine sich von der Nut entfernend konisch verjüngende Außengeometrie besitzt, wie dies
In allen Ausführungsfällen der
Claims (10)
dadurch gekennzeichnet,
dass das Ventilgehäuse (22) unmittelbar brennraumabgewandt der Nut für den Dichtring (2) einen kleineren Außendurchmesser aufweist als den Außendurchmesser unmittelbar brennraumzugewandt der Nut für den Dichtring (2).Fuel injection device for fuel injection systems of internal combustion engines, in particular for the direct injection of fuel into a combustion chamber (17), wherein the fuel injection device comprises at least one fuel injection valve (1) and a receiving bore (20), which is preferably incorporated in a cylinder head (9), for the fuel injection valve (10). 1), wherein on the outer circumference of the fuel injection valve (1) a sealing ring (2) in a groove of a valve housing (22) is provided, which serves to seal the fuel injection valve (1) relative to the receiving bore (20),
characterized,
that the valve housing (22) directly from the combustion chamber away from the groove for the sealing ring (2) has a smaller outer diameter than the outer diameter directly facing the combustion chamber of the groove for the sealing ring (2).
dadurch gekennzeichnet,
dass die Aufnahmebohrung (20) im Bereich der Nut für den Dichtring (2) sowie des Ventilgehäuses (22) sowohl unmittelbar brennraumabgewandt als auch brennraumzugewandt der Nut am Brennstoffeinspritzventil (1) zylindrisch mit einem konstanten Innendurchmesser verläuft.Fuel injection device according to claim 1,
characterized,
that the receiving bore (20) extends in the region of the groove for the sealing ring (2) and the valve housing (22) both directly away from the combustion chamber and facing the combustion chamber of the groove on the fuel injection valve (1) is cylindrical with a constant inner diameter.
dadurch gekennzeichnet,
dass der radiale Abstand zwischen dem Ventilgehäuse (22) und der Aufnahmebohrung (20) unmittelbar brennraumabgewandt der Nut für den Dichtring (2) größer ist als der radiale Abstand zwischen dem Ventilgehäuse (22) und der Aufnahmebohrung (20) unmittelbar brennraumzugewandt der Nut für den Dichtring (2).Fuel injection device according to claim 2,
characterized,
that the radial distance between the valve housing (22) and the receiving bore (20) directly from the combustion chamber facing away from the groove for the sealing ring (2) is greater than the radial distance between the valve housing (22) and the receiving bore (20) directly facing the groove for the groove Sealing ring (2).
dadurch gekennzeichnet,
dass der radiale Abstand zwischen dem Ventilgehäuse (22) und der Aufnahmebohrung (20) unmittelbar brennraumabgewandt der Nut für den Dichtring (2) größer ist als der radiale Abstand zwischen dem Ventilgehäuse (22) und der Aufnahmebohrung (20) brennraumzugewandt der Nut für den Dichtring (2) auf der ganzen Länge bis zu einer Kante, an der der Brennraum (17) beginnt.Fuel injection device according to claim 3,
characterized,
that the radial distance between the valve housing (22) and the receiving bore (20) immediately away from the combustion chamber groove for the sealing ring (2) is greater than the radial distance between the valve housing (22) and the receiving bore (20) facing the combustion chamber groove for the sealing ring (2) along the entire length to an edge where the combustion chamber (17) begins.
dadurch gekennzeichnet,
dass das Ventilgehäuse (22) des Brennstoffeinspritzventils (1) brennraumzugewandt der Nut für den Dichtring (2) im Außendurchmesser konstant oder einfach oder mehrfach gestuft auf der ganzen Länge bis zu einer Kante, an der der Brennraum (17) beginnt, ausgeführt ist und der Außendurchmesser des Ventilgehäuses (22) unmittelbar brennraumabgewandt der Nut für den Dichtring (2) kleiner ist als jeder Außendurchmesser des Ventilgehäuses (22) brennraumzugewandt der Nut für den Dichtring (2) bis zu der Kante, an der der Brennraum (17) beginnt.Fuel injection device according to one of the preceding claims,
characterized,
that the valve housing (22) of the fuel injection valve (1) combustion chamber facing the groove for the sealing ring (2) in the outer diameter constant or single or multiple stages over the entire length to an edge at which the combustion chamber (17) begins, is executed and the Outer diameter of the valve housing (22) immediately away from the combustion chamber groove for the sealing ring (2) is smaller than each outer diameter of the valve housing (22) facing the combustion chamber groove for the sealing ring (2) to the edge at which the combustion chamber (17) begins.
dadurch gekennzeichnet,
dass der Außendurchmesser des Ventilgehäuses (22) unmittelbar brennraumabgewandt der Nut für den Dichtring (2) um 1 bis 10 % kleiner ist als der Außendurchmesser unmittelbar brennraumzugewandt der Nut für den Dichtring (2).Fuel injection device according to one of the preceding claims,
characterized,
that the outer diameter of the valve housing (22) directly from the combustion chamber away from the groove for the sealing ring (2) is smaller by 1 to 10% than the outer diameter directly facing the combustion chamber groove for the sealing ring (2).
dadurch gekennzeichnet,
dass der Außendurchmesser des Ventilgehäuses (22) unmittelbar brennraumabgewandt der Nut für den Dichtring (2) um 1 bis 10 % kleiner ist als jeder der Außendurchmesser brennraumzugewandt der Nut für den Dichtring (2) auf der ganzen Länge bis zu einer Kante, an der der Brennraum (17) beginnt.Fuel injection device according to one of the preceding claims,
characterized,
that the outer diameter of the valve housing (22) directly from the combustion chamber facing away from the groove for the sealing ring (2) by 1 to 10% smaller than each of the outer diameter of the combustion chamber facing the groove for the sealing ring (2) over the entire length to an edge at which Combustion chamber (17) begins.
dadurch gekennzeichnet,
dass das Ventilgehäuse (22) unmittelbar brennraumabgewandt der Nut für den Dichtring (2) eine sich von der Nut entfernend konisch verjüngende Außengeometrie besitzt.Fuel injection device according to one of the preceding claims,
characterized,
in that the valve housing (22), facing away from the combustion chamber, has the groove for the sealing ring (2) an outer geometry that tapers conically away from the groove.
dadurch gekennzeichnet,
dass die Nut für den Dichtring (2) am Ventilgehäuse (22) einen Nutgrund mit einem Durchmesser besitzt, der sich als Außendurchmesser des Ventilgehäuses (22) brennraumabgewandt direkt fortsetzt.Fuel injection device according to one of claims 1 to 7,
characterized,
that the groove for the sealing ring (2) has a diameter on the valve housing (22) has a groove base, which continues as the outer diameter of the valve housing (22) facing away from the combustion chamber directly.
dadurch gekennzeichnet,
dass der Dichtring (2) im eingebauten Zustand des Brennstoffeinspritzventils (1) auf der unteren brennraumzugewandten Nutflanke der Nut aufsitzt.Fuel injection device according to one of the preceding claims,
characterized,
that the sealing ring (2) in the installed state of the fuel injection valve (1) is seated on the lower combustion chamber facing groove flank of the groove.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102015218194.4A DE102015218194A1 (en) | 2015-09-22 | 2015-09-22 | Fuel injection device |
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EP3147493A1 true EP3147493A1 (en) | 2017-03-29 |
EP3147493B1 EP3147493B1 (en) | 2021-09-29 |
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EP16180972.8A Active EP3147493B1 (en) | 2015-09-22 | 2016-07-25 | Fuel injection system |
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EP (1) | EP3147493B1 (en) |
KR (1) | KR20170035335A (en) |
DE (1) | DE102015218194A1 (en) |
Cited By (1)
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CN111005827A (en) * | 2018-10-04 | 2020-04-14 | 罗伯特·博世有限公司 | Fuel injection device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1357284A1 (en) * | 2000-12-26 | 2003-10-29 | Toyota Jidosha Kabushiki Kaisha | Combustion gas seal for injector and sealing structure with the combustion gas seal |
DE102009045692A1 (en) | 2009-10-14 | 2011-04-21 | Robert Bosch Gmbh | Method for mounting a sealing ring |
US20150034742A1 (en) * | 2013-07-30 | 2015-02-05 | Denso Corporation | Fuel injector and fuel injection device using the same |
US20150053182A1 (en) * | 2013-08-23 | 2015-02-26 | Denso Corporation | Fuel injection valve |
-
2015
- 2015-09-22 DE DE102015218194.4A patent/DE102015218194A1/en not_active Ceased
-
2016
- 2016-07-25 EP EP16180972.8A patent/EP3147493B1/en active Active
- 2016-09-21 KR KR1020160120540A patent/KR20170035335A/en active Search and Examination
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1357284A1 (en) * | 2000-12-26 | 2003-10-29 | Toyota Jidosha Kabushiki Kaisha | Combustion gas seal for injector and sealing structure with the combustion gas seal |
DE102009045692A1 (en) | 2009-10-14 | 2011-04-21 | Robert Bosch Gmbh | Method for mounting a sealing ring |
US20150034742A1 (en) * | 2013-07-30 | 2015-02-05 | Denso Corporation | Fuel injector and fuel injection device using the same |
US20150053182A1 (en) * | 2013-08-23 | 2015-02-26 | Denso Corporation | Fuel injection valve |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111005827A (en) * | 2018-10-04 | 2020-04-14 | 罗伯特·博世有限公司 | Fuel injection device |
CN111005827B (en) * | 2018-10-04 | 2024-06-04 | 罗伯特·博世有限公司 | Fuel injection device |
Also Published As
Publication number | Publication date |
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DE102015218194A1 (en) | 2017-03-23 |
KR20170035335A (en) | 2017-03-30 |
EP3147493B1 (en) | 2021-09-29 |
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