EP1332281B1 - Fuel injection unit - Google Patents
Fuel injection unit Download PDFInfo
- Publication number
- EP1332281B1 EP1332281B1 EP01993758A EP01993758A EP1332281B1 EP 1332281 B1 EP1332281 B1 EP 1332281B1 EP 01993758 A EP01993758 A EP 01993758A EP 01993758 A EP01993758 A EP 01993758A EP 1332281 B1 EP1332281 B1 EP 1332281B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injection
- injection unit
- unit according
- fuel
- sleeve
- 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.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
- F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
Definitions
- the invention relates to a fuel injection system for injecting fuel into an internal combustion engine, in particular for the direct injection of fuel into the combustion chamber or the combustion chambers of the internal combustion engine.
- the invention relates to a fuel injection system according to the preamble of the main claim.
- a fuel injection system is known from DE 197 25 076 A1. It has, for the sealing connection between a fuel injection valve and an associated connecting piece of a fuel distributor line in each case an annular seal carrier which is provided with a first sealing element for sealing the seal carrier relative to an end face of an inlet section of the fuel injection valve and a second sealing element for sealing the seal carrier relative to the connecting piece of the fuel distributor line interacts.
- An insertable into a fuel inlet port of the inlet section bushing penetrates the annular seal carrier, so that the seal carrier between an upstream collar of Socket and the inlet portion of the fuel injection valve is movably locked in the radial direction.
- a disadvantage of the arrangement described in the above publication is that two components are present by a total of two sealing elements, where errors can occur and it may come to leaks in particular.
- the two sealing elements are mounted one above the other and therefore require height. Since the sealing elements can not lie directly against one another and sufficient material must be present in order to be able to mold the annular grooves, the additional height required for the seal carrier is not insignificant.
- Another disadvantage of the arrangement described in the above publication is that the radial mobility of the seal carrier is only guaranteed if this still has a certain axial play and is not pressed by the bush against the inlet section. Consequently, the socket must be inserted during assembly with a well-defined depth in the fuel inlet opening and the socket as well as the fuel inlet opening in the fuel injection valve to be made very accurately.
- JP-OS 08-312503 It is already known from JP-OS 08-312503 known to seal a usable in a receiving bore fuel injector having an inlet portion, sealed by an O-ring at this inlet portion relative to a connecting piece of a fuel distribution line. In this case, the O-ring is sealingly against an inner wall of the connecting piece.
- a disadvantage of this known state of the art is that the positional variations of the fuel injection valve relative to the fuel distributor line occurring due to manufacturing tolerances, as far as the axes of the connecting piece of the fuel distributor line and of the fuel injection valve are shifted from each other, can be compensated only by unbalanced squeezing of the O-ring. Here it comes even at relatively low bruising of the O-ring leaks.
- the fuel injection system according to the invention with the characterizing features of the main claim has the advantage that positional deviations of the axes of the connecting piece of the fuel rail and the fuel injection valve are balanced against each other safely. An undesirable tension of the fuel injection valve relative to the fuel distributor line can be avoided. Above all, it is compared with the known ones. Gaskets that can compensate for tolerances, achieved a smaller size.
- inner sleeve and outer sleeve are connected via spiral springs.
- the seal carrier is fixed by a retaining ring on the guide portion of the fuel injection valve with its inner sleeve against the end face of the inlet section. Also remains favorable due to the elasticity of the sealing element under the action of pressurized fuel between the end face of the inlet section and the outer sleeve of the seal carrier, a gap. Even if the inner sleeve is pressed by manufacturing tolerances by the locking ring against the end face, the outer ring with the sealing element retains its functionality.
- a hollow screw which is screwed into a threaded bore of the fuel injection valve and holds the seal carrier against the fuel injection valve.
- the outer ring on an upstream radially outward, circumferential, tapered chamfer.
- FIG. 1 shows a sectional representation of an inventive embodiment of a fuel injection system in a partial representation of the connection region between a fuel injector 1 and a Brenmstoffverteilertechnisch 2.
- the fuel distribution line 2 is drawn here only in the region of a connecting piece 3 and the fuel injector 1 only in the region of an inlet section 4, which has a guide section 5.
- the inlet section 4 is integrally formed with the fuel injection valve 1. At the transition of the inlet section 4 to the guide section 5, an end face 6 is formed.
- a guide support 30 consists of an inner sleeve 8 and an outer sleeve 9, which radially surrounds the inner sleeve 8 and is elastically connected to the inner sleeve 8 via helically arranged leaf springs 10.
- the inner sleeve 8 is penetrated and guided by the guide section 5.
- a securing ring 11 the inner sleeve 8 is held in position and pressed against the end face 6 of the inlet section 4.
- the retaining ring 11 is inserted into a circumferential groove 12 of the guide portion 5.
- an O-ring 14 is used as a sealing element.
- a dead space 15 formed between the outer sleeve 9 and the O-ring 14 is connected via a pressure equalization bore 16 with the fuel chamber 17 to be sealed.
- the dead space 15 is formed between sealing edges 18,19 of the O-ring 14 with respect to the gradation 13 of the outer sleeve 9.
- the outer sleeve 9 has at its upstream end on a circumferential conical taper 23.
- a central axis 24 is drawn for clarity.
- a central axis 25 is drawn through the connecting piece 3.
- the outer sleeve 9 is connected to the inner sleeve 8 only elastically via the leaf springs 10, such that only small forces are transmitted in the axial direction. Regardless of whether and with what force the inner sleeve 8 is pressed against the end face 6, formed between outer sleeve 9 and end face 6, a gap b, the size of the elasticity of the O-ring 14 and the prevailing pressure in the fuel chamber 17 depends. As a result, the outer sleeve 9 is slightly radially displaceable. In conjunction with the chamfer 23, the outer sleeve 9 sets during assembly on the offset a. This is possible as long as the axial sealing edge 20 still rests completely on the end face 6.
- the sealing effect of the O-ring 14 is enhanced by the pressure compensation bore 16.
- the pressure equalization bore 16 of the O-ring 14 is also applied in the dead space 15 on its cross-sectional circumference between the sealing edges 18,19 to the outer sleeve 9 with fuel under pressure.
- the contact pressure on the Axialdichtkante 20 and the peripheral sealing edge 21 is reinforced.
- the outer sleeve 9 concentrically surrounds the inner sleeve 8. Both are elastically connected to each other via the leaf springs 26, which are directed radially outward and in the illustrated Training have a convolution.
- the outer sleeve 9 concentrically surrounds the inner sleeve 8. Both are connected to each other via the leaf springs 27, which are directed radially outwardly formed as a spiral spring leaves.
- Fig. 4 shows a further embodiment of a fuel injection system according to the invention in a detail corresponding to the detail IV of Fig. 1. Since the embodiment deviates from the embodiment only in this detail, as shown in Fig. 1, the same reference numerals are used for the same parts ,
- the seal carrier 30 consists of the inner sleeve 8 and the outer sleeve 9, which comprises the inner sleeve 8 radially and is elastically connected to the inner sleeve 8 via helically arranged leaf springs 10.
- a retaining ring 28 which is seated in the groove 12, holding the inner sleeve 8 and outer sleeve 9 against the end face 6.
- the located in the gradation 13 of the outer sleeve 9 O-ring 14 is supported by a support ring 29 between the O-ring 14 and end face. 6 is arranged, supported.
- the O-ring 14 is sealingly against the connecting piece 3.
- the outer sleeve 9 is held more securely in position.
- the O-ring 14 can be deformed more, without causing leaks.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung betrifft eine Brennstoffeinspritzanlage zum Einspritzen von Brennstoff in eine Brennkraftmaschine, insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum bzw. die Brennräume der Brennkraftmaschine.The invention relates to a fuel injection system for injecting fuel into an internal combustion engine, in particular for the direct injection of fuel into the combustion chamber or the combustion chambers of the internal combustion engine.
Die Erfindung geht aus von einer Brennstoffeinspritzanlage nach der Gattung des Hauptanspruchs. Eine solche Brennstoffeinspritzanlage ist aus der DE 197 25 076 A1 bekannt. Sie weist zur dichtenden Verbindung zwischen einem Brennstoffeinspritzventil und einem zugeordneten Verbindungsstutzen einer Brennstoffverteilerleitung jeweils einen ringförmigen Dichtungsträger auf, der mit einem ersten Dichtungselement zur Abdichtung des Dichtungsträgers gegenüber einer Stirnfläche eines Zulaufabschnitts des Brennstoffeinspritzventils und mit einem zweiten Dichtungselement zur Abdichtung des Dichtungsträgers gegenüber dem Verbindungsstutzen der Brennstoffverteilerleitung zusammenwirkt. Eine in eine Brennstoff-Einlaßöffnung des Zulaufabschnitts einsetzbare Buchse durchdringt den ringförmigen Dichtungsträger, so daß der Dichtungsträger zwischen einem stromaufwärtigen Kragen der Buchse und dem Zulaufabschnitt des Brennstoff-Einspritzventils in radialer Richtung beweglich arretiert ist.The invention relates to a fuel injection system according to the preamble of the main claim. Such a fuel injection system is known from DE 197 25 076 A1. It has, for the sealing connection between a fuel injection valve and an associated connecting piece of a fuel distributor line in each case an annular seal carrier which is provided with a first sealing element for sealing the seal carrier relative to an end face of an inlet section of the fuel injection valve and a second sealing element for sealing the seal carrier relative to the connecting piece of the fuel distributor line interacts. An insertable into a fuel inlet port of the inlet section bushing penetrates the annular seal carrier, so that the seal carrier between an upstream collar of Socket and the inlet portion of the fuel injection valve is movably locked in the radial direction.
Nachteilig an der in der obengenannten Druckschrift beschriebenen Anordnung ist, daß durch insgesamt zwei Dichtungselemente zwei Bauteile vorhanden sind, an denen Fehler auftreten können und es insbesondere zu Undichtigkeiten kommen kann. Die zwei Dichtungselemente sind übereinanderliegend montiert und erfordern daher Bauhöhe. Da die Dichtelemente nicht direkt aneinander liegen können und genügend Material vorhanden sein muß, um die Ringnuten ausformen zu können, ist die für den Dichtungsträger erforderliche zusätzliche Bauhöhe nicht unerheblich. Weiterhin nachteilig an der in der obengenannten Druckschrift beschriebenen Anordnung ist, daß die radiale Beweglichkeit des Dichtungsträgers nur gewährleistet ist, wenn dieser noch ein gewisses axiales Spiel hat und nicht von der Buchse gegen den Zulaufabschnitt gepreßt wird. Folglich muß die Buchse bei der Montage mit einer genau definierten Tiefe in die Brennstoffeinlaßöffnung eingesetzt werden und die Buchse wie auch die Brennstoffeinlaßöffnung in dem Brennstoffeinspritzventil sehr genau gefertigt werden.A disadvantage of the arrangement described in the above publication is that two components are present by a total of two sealing elements, where errors can occur and it may come to leaks in particular. The two sealing elements are mounted one above the other and therefore require height. Since the sealing elements can not lie directly against one another and sufficient material must be present in order to be able to mold the annular grooves, the additional height required for the seal carrier is not insignificant. Another disadvantage of the arrangement described in the above publication is that the radial mobility of the seal carrier is only guaranteed if this still has a certain axial play and is not pressed by the bush against the inlet section. Consequently, the socket must be inserted during assembly with a well-defined depth in the fuel inlet opening and the socket as well as the fuel inlet opening in the fuel injection valve to be made very accurately.
Es ist bereits aus der JP-OS 08-312503 bekannt, ein in eine Aufnahmebohrung einsetzbares Brennstoffeinspritzventil, das einen Zulaufabschnitt aufweist, durch einen O-Ring an diesem Zulaufabschnitt gegenüber einem Verbindungsstutzen einer Brennstoffverteilerleitung abzudichten. Dabei liegt der O-Ring an einer Innenwandung des Verbindungsstutzens dichtend an.It is already known from JP-OS 08-312503 known to seal a usable in a receiving bore fuel injector having an inlet portion, sealed by an O-ring at this inlet portion relative to a connecting piece of a fuel distribution line. In this case, the O-ring is sealingly against an inner wall of the connecting piece.
Nachteilig an diesem bekannten Stand der Technik ist, daß die durch Fertigungstoleranzen auftretenden Positionsabweichungen des Brennstoffeinspritzventils gegenüber der Brennstoffverteilerleitung, soweit die Achsen des Verbindungsstutzens der Brennstoffverteilerleitung und des Brennstoffeinspritzventils gegeneinander verschoben sind, nur durch unsymetrische Quetschung des O-Rings ausgeglichen werden können. Hierbei kommt es bereits bei relativ geringen Quetschungen des O-Rings zu Undichtigkeiten.A disadvantage of this known state of the art is that the positional variations of the fuel injection valve relative to the fuel distributor line occurring due to manufacturing tolerances, as far as the axes of the connecting piece of the fuel distributor line and of the fuel injection valve are shifted from each other, can be compensated only by unbalanced squeezing of the O-ring. Here it comes even at relatively low bruising of the O-ring leaks.
Die erfindungsgemäße Brennstoffeinspritzanlage mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß Positionsabweichungen der Achsen des Verbindungsstutzens der Brennstoffverteilerleitung und des Brennstoffeinspritzventils gegeneinander sicher ausgeglichen werden. Eine unerwünschte Verspannung des Brennstoffeinspritzventils gegenüber der Brennstoffverteilerleitung kann dadurch vermieden werden. Vor allem wird gegenüber den bekannten. Dichtungen, die Toleranzen ausgleichen können, eine geringere Baugröße erreicht.The fuel injection system according to the invention with the characterizing features of the main claim has the advantage that positional deviations of the axes of the connecting piece of the fuel rail and the fuel injection valve are balanced against each other safely. An undesirable tension of the fuel injection valve relative to the fuel distributor line can be avoided. Above all, it is compared with the known ones. Gaskets that can compensate for tolerances, achieved a smaller size.
Durch die in den Unteransprüchen aufgeführten Merkmale sind vorteilhafte Weiterbildungen und Verbesserungen der in dem Hauptanspruch angegebenen Brennstoffeinspritzanlage möglich.The features listed in the dependent claims advantageous refinements and improvements of the main claim fuel injection system are possible.
In einer vorteilhaften Ausführung werden Innenhülse und Außenhülse über spiralförmige Federn verbunden.In an advantageous embodiment, inner sleeve and outer sleeve are connected via spiral springs.
Besonders vorteilhaft ist es, in der Außenhülse Druckausgleichsbohrungen vorzusehen, die den abzudichtenden Brennstoffraum mit einem sich zwischen Dichtkanten des Dichtungsmittels und der Außenhülse bildenden Totraum verbinden. Dadurch wird das Dichtungsmittel durch den Druck des Brennstoffs auf einem größeren Umfang seines Querschnitts beaufschlagt und der Anpreßdruck der Dichtkanten erhöht.It is particularly advantageous to provide pressure compensation bores in the outer sleeve, which connect the fuel chamber to be sealed with a dead space forming between sealing edges of the sealing means and the outer sleeve. As a result, the sealing means is acted upon by the pressure of the fuel over a larger circumference of its cross section and the contact pressure of the sealing edges is increased.
Günstig wird der Dichtungsträger durch einen Sicherungsring an dem Führungsabschnitt des Brennstoffeinspritzventils mit seiner Innenhülse gegen die Stirnfläche des Zulaufabschnitts fixiert. Ebenfalls günstig verbleibt durch die Elastizität des Dichtungselements auch unter Beaufschlagung mit unter Druck stehendem Brennstoff zwischen der Stirnfläche des Zulaufabschnitts und der Außenhülse des Dichtungsträgers ein Spalt. Auch wenn die Innenhülse durch Fertigungstoleranzen durch den Sicherungsring gegen die Stirnfläche gepreßt wird, behält der Außenring mit dem Dichtungselement seine Funktionsfähigkeit.Conveniently, the seal carrier is fixed by a retaining ring on the guide portion of the fuel injection valve with its inner sleeve against the end face of the inlet section. Also remains favorable due to the elasticity of the sealing element under the action of pressurized fuel between the end face of the inlet section and the outer sleeve of the seal carrier, a gap. Even if the inner sleeve is pressed by manufacturing tolerances by the locking ring against the end face, the outer ring with the sealing element retains its functionality.
In einer vorteilhaften Ausführung dient als Führungsabschnitt eine Hohlschraube, die in eine Gewindebohrung des Brennstoffeinspritzventils eingeschraubt wird und den Dichtungsträger gegen das Brennstoffeinspritzventil hält.In an advantageous embodiment serves as a guide portion a hollow screw which is screwed into a threaded bore of the fuel injection valve and holds the seal carrier against the fuel injection valve.
Günstig weist der Außenring eine stromaufwärtige radial außen gelegene, umfängliche, kegelförmige Anschrägung auf. Durch diese wird das Einführen des Dichtungsträgers in den Verbindungsstutzen erleichtert.Conveniently, the outer ring on an upstream radially outward, circumferential, tapered chamfer. By this, the insertion of the seal carrier is facilitated in the connecting piece.
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
- Fig. 1
- einen Schnitt durch ein erfindungsgemäßes Ausführungsbeispiel in einer auszugsweisen Darstellung des Verbindungsbereichs zwischen dem Brennstoffeinspritzventil und der Brennstoffverteilerleitung;
- Fig. 2
- in Aufsicht einen Dichtungsträger des in Fig. 1 dargestellten Auführungsbeispiels;
- Fig. 3
- in Aufsicht eine alternative Ausführungsform eines Dichtungsträgers; und
- Fig. 4
- eine weitere Ausführungsform einer erfindungsgemäßen Brennstoffeinspritzanlage in einem Detail entsprechend dem Ausschnitt IV der Fig. 1.
- Fig. 1
- a section through an inventive embodiment in an abstract representation of the connecting portion between the fuel injection valve and the fuel distribution line;
- Fig. 2
- in plan view a seal carrier of the Auführungsbeispiels shown in Figure 1;
- Fig. 3
- in plan view an alternative embodiment of a seal carrier; and
- Fig. 4
- a further embodiment of a fuel injection system according to the invention in a detail corresponding to the detail IV of FIG. 1.
Fig. 1 zeigt in geschnittener Darstellung ein erfindungsgemäßes Ausführungsbeispiel einer Brennstoffeinspritzanlage in einer auszugsweisen Darstellung des Verbindungsbereichs zwischen einem Brennstoffeinspritzventil 1 und einer Brenmstoffverteilerleitung 2. Die Brennstoffverteilerleitung 2 ist hier nur im Bereich eines Verbindungsstutzens 3 und das Brennstoffeinspritzventil 1 nur im Bereich eines Zulaufabschnitts 4 gezeichnet, der einen Führungsabschnitt 5 aufweist.1 shows a sectional representation of an inventive embodiment of a fuel injection system in a partial representation of the connection region between a fuel injector 1 and a Brenmstoffverteilerleitung 2. The fuel distribution line 2 is drawn here only in the region of a connecting
Der Zulaufabschnitt 4 ist mit dem Brennstoffeinspritzventil 1 einstückig ausgeformt. An dem Übergang des Zulaufabschnitts 4 zu dem Führungsabschnitt 5 ist eine Stirnfläche 6 ausgeformt. Den Führungsabschnitt 5 und den Zulaufabschnitt 4 durchdringt eine Brennstoffzulaufbohrung 7 des Brennstoffeinspritzventils 1. Ein Dichtungsträger 30 besteht aus einer Innenhülse 8 und einer Außenhülse 9, die die Innenhülse 8 radial umfaßt und mit der Innenhülse 8 über spiralförmig angeordnete Blattfedern 10 elastisch verbunden ist. Die Innenhülse 8 wird von dem Führungsabschnitt 5 durchdrungen und geführt. Durch einen Sicherungsring 11 wird die Innenhülse 8 in ihrer Lage festgehalten und gegen die Stirnfläche 6 des Zulaufabschnitts 4 gedrückt.The inlet section 4 is integrally formed with the fuel injection valve 1. At the transition of the inlet section 4 to the
Der Sicherungsring 11 ist in eine umlaufende Nut 12 des Führungsabschnitts 5 eingesetzt. In eine rechteckförmig ausgebildete und der Stirnfläche 6 zugewandte Abstufung 13 der Außenhülse 9 ist ein O-Ring 14 als Dichtelement eingesetzt. Ein zwischen der Außenhülse 9 und dem O-Ring 14 gebildeter Totraum 15 ist über eine Druckausgleichsbohrung 16 mit dem abzudichtenden Brennstoffraum 17 verbunden. Der Totraum 15 wird zwischen Dichtkanten 18,19 des O-Rings 14 gegenüber der Abstufung 13 der Außenhülse 9 gebildet. Mit einer Axialdichtkante 20 liegt der O-Ring 14 auf der Stirnfläche 6 und mit einer Umfangsdichtkante 21 an einer Innenwandung 22 des Verbindungsstutzens 3 auf. Die Außenhülse 9 weist an ihrem stromaufwärtigen Ende eine umfängliche kegelförmige Anschrägung 23 auf. Durch das Brennstoffeinspritzventil 1 ist zur Verdeutlichung eine Mittelachse 24 gezeichnet. Ebenso ist durch den Verbindungsstutzen 3 eine Mittelachse 25 gezeichnet. Durch Fertigunstoleranzen kann ein Versatz der Achsen 24, 25 um das Maß a entstehen.The
Die Außenhülse 9 ist mit der Innenhülse 8 nur elastisch über die Blattfedern 10 verbunden, derart, daß nur geringe Kräfte in axialer Richtung übertragen werden. Unabhängig davon, ob und mit welcher Kraft die Innenhülse 8 gegen die Stirnfläche 6 gedrückt wird, bildet sich zwischen Außenhülse 9 und Stirnfläche 6 ein Spalt b, dessen Größe von der Elastizität des O-Rings 14 und dem herrschenden Druck im Brennstoffraum 17 abhängt. Dadurch ist die Außenhülse 9 leicht radial verschiebbar. In Verbindung mit der Anschrägung 23 stellt sich die Außenhülse 9 bei der Montage auf den Versatz a ein. Dies ist solange möglich, wie die Axialdichtkante 20 noch vollständig auf der Stirnfläche 6 aufliegt. Im Betrieb des Brennstoffeinspritzventils 1 wird die Dichtwirkung des O-Rings 14 durch die Druckausgleichsbohrung 16 verstärkt. Durch die Druckausgleichsbohrung 16 wird der O-Ring 14 auch in dem Totraum 15 auf seinem Querschnittsumfang zwischen den Dichtkanten 18,19 zu der Außenhülse 9 mit Brennstoff unter Druck beaufschlagt. Dadurch wird der Anpreßdruck auf die Axialdichtkante 20 und die Umfangsdichtkante 21 verstärkt.The
Fig. 2 zeigt in Aufsicht den Dichtungsträger 30 aus Fig. 1 mit einer erfindungsgemäßen Ausbildung von Blattfedern 26. Die Außenhülse 9 umgibt konzentrisch die Innenhülse 8. Beide sind elastisch miteinander verbunden über die Blattfedern 26, die radial nach außen gerichtet sind und in der dargestellten Ausbildung eine Faltung aufweisen.The
Fig. 3 zeigt in Aufsicht den Dichtungsträger 30 aus Fig. 1 mit einer weiteren erfindungsgemäßen Ausbildung von Blattfedern 27. Die Außenhülse 9 umgibt konzentrisch die Innenhülse 8. Beide sind über die Blattfedern 27 miteinander verbunden, die radial nach außen gerichtet als Spiralfederblätter ausgebildet sind.The
Fig. 4 zeigt eine weitere Ausführungsform einer erfindungsgemäßen Brennstoffeinspritzanlage in einem Detail entsprechend dem Ausschnitt IV der Fig. 1. Da die Ausführungsform nur in diesem Detail von der Ausführungsform abweicht, wie sie in Fig. 1 dargestellt ist, werden für gleiche Teile dieselben Bezugszeichen benutzt. Der Dichtungsträger 30 besteht aus der Innenhülse 8 und der Außenhülse 9, die die Innenhülse 8 radial umfaßt und mit der Innenhülse 8 über spiralförmig angeordnete Blattfedern 10 elastisch verbunden ist. Ein Sicherungsring 28, der in der Nut 12 sitzt, hält Innenhülse 8 und Außenhülse 9 gegen die Stirnfläche 6. Der in der Abstufung 13 der Außenhülse 9 gelegene O-Ring 14 wird von einem Stützring 29, der zwischen O-Ring 14 und Stirnfläche 6 angeordnet ist, gestützt. Der O-Ring 14 liegt dichtend an dem Verbindungsstutzen 3 an.Fig. 4 shows a further embodiment of a fuel injection system according to the invention in a detail corresponding to the detail IV of Fig. 1. Since the embodiment deviates from the embodiment only in this detail, as shown in Fig. 1, the same reference numerals are used for the same parts , The
In der dargestellten Ausführungsform der Brennstoffeinspritzanlage wird die Außenhülse 9 sicherer in ihrer Position gehalten. Durch den Stützring 29 kann der O-Ring 14 stärker verformt werden, ohne daß es zu Undichtigkeiten kommt.In the illustrated embodiment of the fuel injection system, the
Claims (16)
- Fuel injection unit for injecting fuel into an internal combustion engine having at least one fuel injection valve (1) which has an inflow section (4), and a fuel distributor line (2) which has, for each fuel injection valve (1), a connector (3) which can be connected to the inflow section (4), wherein in each case an annular seal carrier (30) is provided for providing a seal-forming connection between each fuel injection valve (1) and the respective connector (3) of the fuel distributor line (2), characterized in that the seal carrier (30) has an internal sleeve (8), which is guided by a guide section (5) of the inflow section (4), and an external sleeve (9) which radially surrounds the internal sleeve (8) and is connected in a radially elastic fashion to the internal sleeve (8), and in that the seal carrier (30) surrounds a sealing element (14) with the external sleeve (9) and at the same time holds the sealing element (14) circumferentially against an internal wall (22) of the connector (3) and axially against a radial end face (6) of the inflow section (4) of the fuel injection valve (1).
- Fuel injection unit according to Claim 1, characterized in that the sealing element (14) is guided in a step (13), facing the fuel injection valve (1), in the external sleeve (9).
- Fuel injection unit according to Claim 1 or 2, characterized in that the internal sleeve (8) and external sleeve (9) are elastically connected by means of springs.
- Fuel injection unit according to Claim 3, characterized in that the springs are composed of leaf springs (10, 26, 27) which are arranged in a helical shape between the internal sleeve (8) and external sleeve (9).
- Fuel injection unit according to Claim 4, characterized in that the leaf springs (26) are folded.
- Fuel injection unit according to one of Claims 1 to 5, characterized in that the external sleeve (9) has at least one pressure-equalizing bore (16) which connects a fuel space (17) to be sealed to a dead space (15) formed between sealing edges (18, 19) of the sealing element (14) and the external sleeve (9).
- Fuel injection unit according to one of Claims 1 to 6, characterized in that the seal carrier (30) is secured with its internal sleeve (8) against the end face (6) of the inflow section (4) by means of a securing ring (11, 28) on the guide section (5) of the fuel injection valve (1).
- Fuel injection unit according to Claim 7, characterized in that the securing ring (28) at least partially covers the external sleeve (9).
- Fuel injection unit according to Claim 8, characterized in that the securing ring (28) has pressure-equalizing bores or grooves by means of which a fuel space (17) to be sealed is connected to pressure-equalizing bores (16) in the external sleeve (9) which are connected to a dead space (15) formed between sealing edges (18, 19) of the sealing element (14) and the external sleeve (9).
- Fuel injection unit according to one of Claims 7 to 9, characterized in that the securing ring (11, 28) is welded to the guide section (5).
- Fuel injection unit according to one of Claims 7 to 9, characterized in that the securing ring (11, 28) is held in a groove (12) on the guide section (5).
- Fuel injection unit according to one of Claims 7 to 9, characterized in that the securing ring (11, 28) is held on the guide section (5) by a hollow screw which engages in a fuel inflow bore (7) which is embodied as a threaded bore.
- Fuel injection unit according to one of Claims 7 to 9, characterized in that as a result of the elasticity of the sealing element (14) a gap (b) remains between the end face (6) of the inflow section (4) and the external sleeve (9) of the seal carrier (30) even when pressurized fuel is applied.
- Fuel injection unit according to one of Claims 1 to 13, characterized in that the sealing element (14) is embodied as a circumferential annular seal.
- Fuel injection unit according to one of Claims 1 to 14, characterized in that the external sleeve (9) has, at its upstream end, a circumferential, conical bevel (23) located radially on the outside.
- Fuel injection unit according to one of Claims 1 to 15, characterized in that a supporting ring (29) is arranged between the sealing element (14) and end face (6) of the inflow section (4).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10056005A DE10056005A1 (en) | 2000-11-11 | 2000-11-11 | Fuel injection valve, for an IC motor, has a ring seal at the connector to the fuel distribution line, with elasticity to compensate for shifts in position between the axes of the connector and the fuel injection valve |
| DE10056005 | 2000-11-11 | ||
| PCT/DE2001/004206 WO2002038943A2 (en) | 2000-11-11 | 2001-11-12 | Fuel injection unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1332281A2 EP1332281A2 (en) | 2003-08-06 |
| EP1332281B1 true EP1332281B1 (en) | 2006-02-22 |
Family
ID=7662992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01993758A Expired - Lifetime EP1332281B1 (en) | 2000-11-11 | 2001-11-12 | Fuel injection unit |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6701899B2 (en) |
| EP (1) | EP1332281B1 (en) |
| JP (1) | JP4021762B2 (en) |
| DE (2) | DE10056005A1 (en) |
| ES (1) | ES2257464T3 (en) |
| WO (1) | WO2002038943A2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10056038A1 (en) * | 2000-11-11 | 2002-05-16 | Bosch Gmbh Robert | Fuel injection system has seals ring-grooved for movement at seal support endfaces plus upstream safety ring to reinforce operational sealing. |
| DE102007035714A1 (en) | 2007-07-30 | 2009-02-05 | Robert Bosch Gmbh | Fuel injection system with compensation element |
| EP2112367B1 (en) * | 2008-04-23 | 2011-09-14 | Continental Automotive GmbH | Coupling arrangement and fuel injector |
| US20090321536A1 (en) * | 2008-06-30 | 2009-12-31 | Caterpillar Inc. | Piston having channel extending through piston head |
| US8069842B2 (en) * | 2009-07-02 | 2011-12-06 | Robert Bosch Gmbh | Injector mounting assembly |
| US20110265767A1 (en) * | 2010-05-03 | 2011-11-03 | Delphi Technologies, Inc. | Isolater for fuel injector |
| DE102011082743A1 (en) * | 2011-09-15 | 2013-03-21 | Robert Bosch Gmbh | fuel distributor |
| FR2997456B1 (en) | 2012-10-30 | 2014-11-28 | Delphi Technologies Holding | HIGH PRESSURE VALVE |
| DE102013200993A1 (en) * | 2013-01-22 | 2014-07-24 | Robert Bosch Gmbh | Fuel injection system with a fuel-carrying component, a fuel injection valve and a suspension |
| DE102013222508B4 (en) * | 2013-11-06 | 2023-07-27 | Robert Bosch Gmbh | Valve for metering fluid under high pressure |
| US10544771B2 (en) * | 2017-06-14 | 2020-01-28 | Caterpillar Inc. | Fuel injector body with counterbore insert |
| US11174825B2 (en) * | 2019-02-11 | 2021-11-16 | Caterpillar Inc. | Seal configuration for fuel injector |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08312503A (en) | 1995-03-10 | 1996-11-26 | Mitsubishi Motors Corp | Installation structure of fixed object, especially, of injector for cylinder injection type internal combustion engine |
| US5752487A (en) * | 1997-06-11 | 1998-05-19 | Caterpillar Inc. | Injector combustion gas seal |
| DE19725076A1 (en) | 1997-06-13 | 1998-12-17 | Bosch Gmbh Robert | Fuel injection system |
| DE19735665A1 (en) | 1997-06-25 | 1999-01-07 | Bosch Gmbh Robert | Fuel injection system |
| JP2000018125A (en) * | 1998-07-01 | 2000-01-18 | Mitsubishi Electric Corp | Fuel injection valve for cylinder injection |
-
2000
- 2000-11-11 DE DE10056005A patent/DE10056005A1/en not_active Withdrawn
-
2001
- 2001-11-12 US US10/169,967 patent/US6701899B2/en not_active Expired - Lifetime
- 2001-11-12 DE DE50109021T patent/DE50109021D1/en not_active Expired - Lifetime
- 2001-11-12 JP JP2002541240A patent/JP4021762B2/en not_active Expired - Fee Related
- 2001-11-12 WO PCT/DE2001/004206 patent/WO2002038943A2/en active IP Right Grant
- 2001-11-12 ES ES01993758T patent/ES2257464T3/en not_active Expired - Lifetime
- 2001-11-12 EP EP01993758A patent/EP1332281B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US6701899B2 (en) | 2004-03-09 |
| US20030145831A1 (en) | 2003-08-07 |
| DE10056005A1 (en) | 2002-05-16 |
| DE50109021D1 (en) | 2006-04-27 |
| JP4021762B2 (en) | 2007-12-12 |
| JP2004513293A (en) | 2004-04-30 |
| WO2002038943A3 (en) | 2002-08-15 |
| ES2257464T3 (en) | 2006-08-01 |
| EP1332281A2 (en) | 2003-08-06 |
| WO2002038943A2 (en) | 2002-05-16 |
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