EP0894194A1 - Injection device - Google Patents
Injection deviceInfo
- Publication number
- EP0894194A1 EP0894194A1 EP97908235A EP97908235A EP0894194A1 EP 0894194 A1 EP0894194 A1 EP 0894194A1 EP 97908235 A EP97908235 A EP 97908235A EP 97908235 A EP97908235 A EP 97908235A EP 0894194 A1 EP0894194 A1 EP 0894194A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing
- nozzle
- nozzle holder
- pressure channel
- injection device
- 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
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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
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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 an injection device for diesel engines with a nozzle holder, the pressure channel of which is connected on the one hand to the injection pump and on the other hand to the nozzle, the nozzle holder being sealingly supported by means of an intermediate disk with respect to a nozzle body which accommodates the nozzle needle in the longitudinal direction.
- a deformable metal hollow cylindrical sealing body is supported at one end against a sealing surface and, with increasing tightening of the nozzle clamping nut connecting the nozzle body to the nozzle holder, deforms increasingly against its seat.
- the object on which the present invention is based is to seal the pressure channel on the one hand and the interior of the nozzle body and nozzle holder on the other hand to prevent fuel from escaping through the thread of the nozzle clamping nut, which can be achieved with less effort.
- the sealing body ensures a sealing connection of the pressure channel in the nozzle holder with the intermediate disk or the nozzle body , with the conical sealing surfaces resulting in self-centering of the sealing body and thus ensuring that it seals even under high pressure conditions. In this way, peak pressures up to 1000 bar can be controlled. Furthermore, additional sealing measures for sealing the needle closing spring frame are unnecessary due to the concentric sealing edge.
- the sealing body is designed as a sealing cone with the conical seat in the nozzle holder of a corresponding conical outer shape and that Counter-sealing surface, on which the sealing cone is supported, is formed by the top of the washer.
- the sealing cone solves the partial task that the pressure channel is sealingly connected to the intermediate disk on the high-pressure side, without the need for fine machining of the facing end face of the nozzle holder.
- the deformability of the sealing cone is promoted in that the sealing cone is dimensioned shorter in the axial direction than the seat in which it is received.
- the sealing body is designed as a sealing ring with two externally oppositely conical sections, one section corresponding to the conical seat in the nozzle holder, the other section corresponding to a conically widened mouth of the pressure channel bore of the intermediate disk is and wherein the counter-sealing surface is formed by the mouth of the pressure channel bore of the washer.
- FIG. 1 shows a longitudinal section through the nozzle holder / nozzle body before the nozzle clamping nut is fully tightened
- FIG. 2 shows an enlarged section of FIG. 1 in the area of the pressure channel seal
- FIG. 3 shows a longitudinal section according to FIG. 1 after the nozzle clamping nut has been fully tightened
- nozzle holder 1 with a pressure channel 2, in which the fuel is supplied in the direction of arrow PI from the injection pump, not shown, and a nozzle body 3, which is also provided with a pressure channel 4, which continues the pressure channel 2 of the nozzle holder 1 via a high-pressure connection to be described in more detail.
- the nozzle needle 5 is seated in a central bore, the inner needle end 6 of which is spherical.
- the needle end 6 of the nozzle needle 5 is biased in the direction of the nozzle by means of a compression spring 8 which is arranged in a central bore 7 of the nozzle holder 1. It exerts a force acting on the needle end 6 in the closing direction by being supported on a pressure pin 9 which is seated on the crowned needle end 6 of the nozzle needle 5.
- Nozzle body 3 and nozzle holder 1 are clamped together by means of a nozzle clamping nut 10, which by means of an internal thread 11 is screwed onto an external thread 12 of the nozzle holder 1.
- the high-pressure connection between nozzle holder 1 and nozzle body 3 is established by means of an intermediate disk 13, the two opposite ends of which are finely machined by hardening, grinding and lapping.
- the needle end 6 protrudes through a central bore 14 in the intermediate disk 13.
- the nozzle clamping nut 10 is not yet fully tightened, so that a gap 17 is formed between the top 15 of the intermediate disk 13 and the associated end face 16 of the nozzle holder 1.
- This gap 17 is bridged by a sealing cone 18 made of a steel alloy with properties which can be deformed to a limited extent, for example made of free-cutting steel.
- the sealing cone 18 has a conical outer surface which widens towards the intermediate disk 13 and with which it projects into a corresponding conical seat 19 in the mouth region of the pressure channel 2 of the nozzle holder 1.
- the sealing cone 18 deforms inward as shown in FIG. 3, forming an end bead 20 until it is finally completely accommodated in the interior of the seat 19.
- the sealing cone forms a seal that is sealed against the high pressure in the pressure channel 2, on the one hand with the seat 19, and on the other hand with the upper side 15 of the intermediate disk 13.
- the high-pressure area is sealed off from the low-pressure area in that, as in FIG. 2 enlarged, a sealing edge extends concentrically through the face D 16 of the nozzle holder 1 through the location D coinciding with the wall of the needle closing spring chamber, such that the sealing edge coincides with the central bore 7 of the nozzle holder 1 on its end face 16.
- the location D thus forms the apex for the angle ⁇ between 0.5 ° and 3.0 °, which defines a residual flat surface 21 which runs obliquely to the end face 16 of the nozzle holder 1.
- the remaining surface 21 thus forms the sealing edge at D.
- the sealing edge results in an additional barrier increasing the sealing effect between the high-pressure part formed by the two pressure channels 2, 4 on the one hand and the low-pressure part which is formed by the central interiors in the nozzle holder 1 and in the nozzle body 3 is limited.
- FIG. 4 and 5 each show a variant of the high-pressure side pressure channel seal in a detail enlargement according to FIG. 2.
- the sealing cone 18 is replaced by a sealing ring 22, which essentially consists of two on the outside there is conical sections 26, 27, the conical surfaces of which taper towards the respective end of the sealing ring 22.
- the top Section 26, as described in relation to FIG. 2 is received in the lower end of the pressure channel 2, the lower section 27 enters a correspondingly conically widened mouth 23 of the pressure channel bore 2a of the intermediate disk 13 on its upper side 15.
- the sealing effect is further improved by the enlargement of the sealing surfaces compared to FIG. 3.
- a sealing tube 25 is used which, like the sealing ring 22 (FIG. 4), has two conical sections 26, 27 at the two ends, which are attached to a hollow cylindrical central section 24, which is closely surrounded by a support hole 29 of the intermediate plate 13. While the upper section 26 is received in the conical seat 19 of the pressure channel 2 as described in relation to FIG. 2, the lower section 27 enters a correspondingly conically widened mouth 28 of the pressure channel 4 of the nozzle body 3.
Landscapes
- 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)
- Percussion Or Vibration Massage (AREA)
- Window Of Vehicle (AREA)
- Glass Compositions (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Polarising Elements (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
An injection system for diesel engines with a nozzle holder (1), the pressure channel (2) of which is connected on one side to the injection pump and on the other, comprises a nozzle body (3) secured to the nozzle holder (1) by a tensioning nut (10). To provide a seal, there is an intermediate disc (13) between the nozzle holder (1) and the nozzle body (3). To seal the high-pressure connection in the region of the pressure channels (2, 4) there is a deformable metal seal which bears on a sealing surface and is fitted in a conical seat (19) in the region of the outlet of the pressure channel (2) of the nozzle holder (1).
Description
Einspritzvorrichtung Injector
Die Erfindung betrifft eine Einspritzvorrichtung für Dieselmotoren mit einem Düsenhalter, dessen Druck¬ kanal einerseits mit der Einspritzpumpe, andererseits mit der Düse verbunden ist, wobei der Düsenhalter gegenüber einem die Düsennadel in Längsrichtung verschieblich aufnehmenden Düsenkörper mittels einer Zwischenscheibe dichtend abgestützt ist. Dabei stützt sich ein verformbarer metallener hohlzylindrischer Dichtkörper mit einem Ende gegen eine Dichtfläche ab und verformt sich mit zunehmendem Anziehen der den Düsenkörper mit dem Düsenhalter verbindenden Düsen- spannmutter zunehmend gegen seinen Sitz.The invention relates to an injection device for diesel engines with a nozzle holder, the pressure channel of which is connected on the one hand to the injection pump and on the other hand to the nozzle, the nozzle holder being sealingly supported by means of an intermediate disk with respect to a nozzle body which accommodates the nozzle needle in the longitudinal direction. In this case, a deformable metal hollow cylindrical sealing body is supported at one end against a sealing surface and, with increasing tightening of the nozzle clamping nut connecting the nozzle body to the nozzle holder, deforms increasingly against its seat.
Bei derartigen Einspritzvorrichtungen besteht die Notwendigkeit, den Druckkanal im Übergangsbereich zwischen Düsenhalter und Düsenkörper abzudichten, so daß ein Austreten von Kraftstoff in den Federraum und durch das Gewinde der Düsenspannmutter zuverlässig vermieden wird. Bei bekannten Ausführungsformen wird dies dadurch erreicht, daß die einander zugekehrten Stirnseiten des Düsenhalters und des Düsenkörpers sowie beide Stirnflächen einer zwischen Düsenhalter und Düsenkδrper angeordneten Zwischenscheibe jeweils eine feinbearbeitete Oberfläche aufweisen, welche durch aufwendige Bearbeitungsverfahren gehärtet, plangeschliffen und geläppt ist. Der Druckkanal im Düsenhalter grenzt dabei an eine entsprechende Bohrung in der Zwischenscheibe, deren Bohrung wiederum an einen entsprechenden Druckkanal im Düsen¬ körper an, welcher zur Düse weiterführt. Durch die exakt planparallel geläppten Oberflächen auf beiden Seiten der Zwischenscheibe sowie auf den angrenzenden
Stirnseiten von Düsenhalter und Düsenkörper wird eine zuverlässige Abdichtung erzielt, wobei allerdings ein erheblicher Oberflächenbearbeitungsaufwand in Kauf zu nehmen ist. Eine derartige Einspritzvorrichtung ist in der JP-PS 6-66222 beschrieben.In such injection devices, there is a need to seal the pressure channel in the transition region between the nozzle holder and nozzle body, so that fuel leakage into the spring chamber and through the thread of the nozzle clamping nut is reliably avoided. In known embodiments, this is achieved in that the mutually facing end faces of the nozzle holder and the nozzle body and both end faces of an intermediate disk arranged between the nozzle holder and the nozzle body each have a finely machined surface which is hardened, surface-ground and lapped by complex machining processes. The pressure channel in the nozzle holder adjoins a corresponding bore in the intermediate disk, the bore of which in turn adjoins a corresponding pressure channel in the nozzle body, which leads to the nozzle. Due to the exactly plane-lapped surfaces on both sides of the washer and on the adjacent ones A reliable seal is achieved on the end faces of the nozzle holder and nozzle body, although a considerable amount of surface treatment is to be accepted. Such an injection device is described in JP-PS 6-66222.
Demgegenüber besteht die der vorliegenden Erfindung zugrundeliegende Aufgabe darin, eine Abdichtung des Druckkanals einerseits sowie des Innenraums von Düsenkörper und Düsenhalter andererseits gegen einen Austritt von Kraftstoff durch das Gewinde der Düsen- spannmutter zu erzielen, welche sich mit geringerem Aufwand verwirklichen läßt.In contrast, the object on which the present invention is based is to seal the pressure channel on the one hand and the interior of the nozzle body and nozzle holder on the other hand to prevent fuel from escaping through the thread of the nozzle clamping nut, which can be achieved with less effort.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Obwohl die Restfläche von der zugeordneten Oberseite der Zwischenscheibe entspre¬ chend abgehoben ist, da die Restfläche mit der Ober¬ seite einen Winkel von wenigen Winkelgraden einschließt, sorgt der Dichtkörper für einen dichten¬ den Anschluß des Druckkanals im Düsenhalter mit der Zwischenscheibe bzw. dem Düsenkδrper, wobei sich durch die konischen Dichtflächen ein Selbstzentrieren des Dichtkörpers ergibt und damit gewährleistet ist, daß dieser auch unter Hochdruckbedingungen dichtend abschließt. Auf diese Weise können Spitzendrücke bis zu 1000 bar beherrscht werden. Des weiteren erübrigen sich zusätzliche Dichtungsmaßnahmen zur Abdichtung des Nadelschließfederrahmens aufgrund der konzentri¬ schen Dichtkante.This object is achieved by the features of claim 1. Although the remaining surface is raised accordingly from the assigned upper side of the intermediate disk, since the remaining surface encloses an angle of a few degrees with the upper side, the sealing body ensures a sealing connection of the pressure channel in the nozzle holder with the intermediate disk or the nozzle body , with the conical sealing surfaces resulting in self-centering of the sealing body and thus ensuring that it seals even under high pressure conditions. In this way, peak pressures up to 1000 bar can be controlled. Furthermore, additional sealing measures for sealing the needle closing spring frame are unnecessary due to the concentric sealing edge.
Nach einer ersten bevorzugten Ausführungsform ist vorgesehen, daß der Dichtkörper als Dichtkonus mit dem konischen Sitz im Düsenhalter entsprechender konischer Außenform ausgebildet ist und daß die
Gegen-Dichtflache, auf welcher sich der Dichtkonus abstützt, durch die Oberseite der Zwischenscheibe gebildet ist.According to a first preferred embodiment it is provided that the sealing body is designed as a sealing cone with the conical seat in the nozzle holder of a corresponding conical outer shape and that Counter-sealing surface, on which the sealing cone is supported, is formed by the top of the washer.
Durch den Dichtkonus wird die Teilaufgabe gelöst, daß der Druckkanal hochdruckseitig an die Zwischenscheibe dichtend angeschlossen ist, ohne daß es einer Feinbe¬ arbeitung der zugewandten Stirnseite des Düsenhalters bedarf.The sealing cone solves the partial task that the pressure channel is sealingly connected to the intermediate disk on the high-pressure side, without the need for fine machining of the facing end face of the nozzle holder.
Dabei wird die Verformbarkeit des Dichtkonus dadurch gefördert, daß der Dichtkonus in axialer Richtung kürzer bemessen ist als der Sitz, in dem er aufgenom¬ men ist.The deformability of the sealing cone is promoted in that the sealing cone is dimensioned shorter in the axial direction than the seat in which it is received.
Nach einer zweiten Ausführungsform ist vorgesehen, daß der Dichtkörper als Dichtring mit zwei außensei¬ tig entgegengesetzt konischen Abschnitten ausgebildet ist, wobei ein Abschnitt entsprechend dem konischen Sitz im Düsenhalter, der andere Abschnitt entspre¬ chend einer konisch aufgeweiteten Mündung der Druck¬ kanalbohrung der Zwischenscheibe ausgebildet ist und wobei die Gegen-Dichtflache durch die Mündung der Druckkanalbohrung der Zwischenscheibe gebildet ist. Bei einem derartigen Dichtring mit zwei konischen Abschnitten ist die erzielte Dichtwirkung besonders gut und dauerhaft. Gleiches trifft auf eine dritte Ausführungsfom gemäß dem Kennzeichen von Anspruch 5 zu, bei welcher die Zwischenscheibe durch ein Dichtröhrchen, welches durch eine Stützbohrung der Zwischenscheibe hindurchgesteckt ist, gewissermaßen überbrückt wird; d.h., hier erfolgt die hochdrucksei- tige Abdichtung direkt zwischen den einander zugewandten Mündungen des Druckkanals, einerseits im Düsenhalter, andererseits im Düsenkörper.
Im folgenden werden Ausführungsbeispiele der Erfin¬ dung anhand der Zeichnungen erläutert. Es zeigtAccording to a second embodiment it is provided that the sealing body is designed as a sealing ring with two externally oppositely conical sections, one section corresponding to the conical seat in the nozzle holder, the other section corresponding to a conically widened mouth of the pressure channel bore of the intermediate disk is and wherein the counter-sealing surface is formed by the mouth of the pressure channel bore of the washer. With such a sealing ring with two conical sections, the sealing effect achieved is particularly good and permanent. The same applies to a third embodiment according to the characterizing part of claim 5, in which the intermediate disk is bridged to a certain extent by a sealing tube which is inserted through a supporting hole in the intermediate disk; ie here the high-pressure side sealing takes place directly between the mutually facing mouths of the pressure channel, on the one hand in the nozzle holder and on the other hand in the nozzle body. Exemplary embodiments of the invention are explained below with reference to the drawings. It shows
Fig. 1 einen Längsschnitt durch Düsenhal¬ ter/Düsenkörper vor dem vollständigen Anzie¬ hen der Düsenspannmutter,1 shows a longitudinal section through the nozzle holder / nozzle body before the nozzle clamping nut is fully tightened,
Fig. 2 einen vergrößerten Abschnitt zu Fig. 1 im Bereich der Druckkanaldichtung,2 shows an enlarged section of FIG. 1 in the area of the pressure channel seal,
Fig. 3 einen Längsschnitt gemäß Fig. l nach dem vollständigen Anziehen der Düsenspannmutter und3 shows a longitudinal section according to FIG. 1 after the nozzle clamping nut has been fully tightened and
Fig. 4 und 5 jeweils eine Variante zu Fig. 2.4 and 5 each a variant of FIG. 2nd
Die Einspritzvorrichtung gemäß den Fig. 1 bis 3 umfaßt einen Düsenhalter 1 mit einem Druckkanal 2, in welchem der Kraftstoff in Richtung des Pfeils PI von der nicht dargestellten Einspritzpumpe zugeführt wird, sowie einen Düsenkörper 3, welcher ebenfalls mit einem Druckkanal 4 versehen ist, welcher über eine noch näher zu beschreibende Hochdruckverbindung den Druckkanal 2 des Düsenhalters 1 fortsetzt. Im Düsenkörper 3 sitzt in einer zentrischen Bohrung die Düsennadel 5, deren inneres Nadelende 6 ballig ausge¬ bildet ist. Das Nadelende 6 der Düsennadel 5 wird in Richtung Düse vorgespannt mittels einer Druckfeder 8, die in einer Mittelbohrung 7 des Düsenhalters 1 ange¬ ordnet ist. Sie übt eine auf das Nadelende 6 in Schließrichtung wirkende Kraft aus, indem sie sich auf einen Druckbolzen 9 abstützt, welcher auf dem balligen Nadelende 6 der Düsennadel 5 aufsitzt.1 to 3 comprises a nozzle holder 1 with a pressure channel 2, in which the fuel is supplied in the direction of arrow PI from the injection pump, not shown, and a nozzle body 3, which is also provided with a pressure channel 4, which continues the pressure channel 2 of the nozzle holder 1 via a high-pressure connection to be described in more detail. In the nozzle body 3, the nozzle needle 5 is seated in a central bore, the inner needle end 6 of which is spherical. The needle end 6 of the nozzle needle 5 is biased in the direction of the nozzle by means of a compression spring 8 which is arranged in a central bore 7 of the nozzle holder 1. It exerts a force acting on the needle end 6 in the closing direction by being supported on a pressure pin 9 which is seated on the crowned needle end 6 of the nozzle needle 5.
Düsenkδrper 3 und Düsenhalter 1 werden mittels einer Düsenspannmutter 10 zusammengespannt, welche mittels
eines Innengewindes 11 auf ein Außengewinde 12 des Düsenhalters 1 aufgeschraubt ist.Nozzle body 3 and nozzle holder 1 are clamped together by means of a nozzle clamping nut 10, which by means of an internal thread 11 is screwed onto an external thread 12 of the nozzle holder 1.
Die Hochdruckverbindung zwischen Düsenhalter 1 und Düsenkörper 3 wird hergestellt mittels einer Zwischenscheibe 13, deren beide gegenüberliegende Stirnseiten durch Härten, Schleifen und Läppen fein¬ bearbeitet sind. Durch eine zentrale Bohrung 14 der Zwischenscheibe 13 ragt das Nadelende 6 hindurch.The high-pressure connection between nozzle holder 1 and nozzle body 3 is established by means of an intermediate disk 13, the two opposite ends of which are finely machined by hardening, grinding and lapping. The needle end 6 protrudes through a central bore 14 in the intermediate disk 13.
Gemäß Fig. 1 ist die Düsenspannmutter 10 noch nicht vollständig angezogen, so daß zwischen der Oberseite 15 der Zwischenscheibe 13 und der zugeordneten Stirn¬ seite 16 des Düsenhalters 1 ein Spalt 17 gebildet ist. Dieser Spalt 17 wird überbrückt von einem Dicht¬ konus 18 aus einer Stahllegierung mit begrenzt verformbaren Eigenschaften bspw. aus Automatenstahl. Der Dichtkonus 18 besitzt eine sich zur Zwischen¬ scheibe 13 hin verbreitende konische Mantelfläche, mit welcher er in einen entsprechenden konischen Sitz 19 im Mündungsbereich des Druckkanals 2 des Düsenhal¬ ters 1 hineinragt.1, the nozzle clamping nut 10 is not yet fully tightened, so that a gap 17 is formed between the top 15 of the intermediate disk 13 and the associated end face 16 of the nozzle holder 1. This gap 17 is bridged by a sealing cone 18 made of a steel alloy with properties which can be deformed to a limited extent, for example made of free-cutting steel. The sealing cone 18 has a conical outer surface which widens towards the intermediate disk 13 and with which it projects into a corresponding conical seat 19 in the mouth region of the pressure channel 2 of the nozzle holder 1.
Wird die Düsenspannmutter 10 weiter angezogen, so verformt sich der Dichtkonus 18 wie in Fig. 3 gezeigt nach innen hin, wobei er einen Endwulst 20 bildet, bis er letztlich vollständig im Inneren des Sitzes 19 aufgenommen ist. In der in Fig. 3 dargestellten Dichtposition bildet der Dichtkonus einen gegen den Hochdruck im Druckkanal 2 dichten Abschluß einerseits mit dem Sitz 19, andererseits mit der Oberseite 15 der Zwischenscheibe 13.If the nozzle clamping nut 10 is further tightened, the sealing cone 18 deforms inward as shown in FIG. 3, forming an end bead 20 until it is finally completely accommodated in the interior of the seat 19. In the sealing position shown in FIG. 3, the sealing cone forms a seal that is sealed against the high pressure in the pressure channel 2, on the one hand with the seat 19, and on the other hand with the upper side 15 of the intermediate disk 13.
Die Abdichtung des Hochdruckbereichs gegenüber dem Niederdruckbereich erfolgt dadurch, daß, wie in Fig.
2 vergrößert dargestellt, über die Stirnseite 16 des Düsenhalters 1 eine Dichtkante konzentrisch durch den mit der Wand des Nadelschließfederraums zusammen¬ fallenden Ort D verläuft, derart, daß die Dichtkante mit der Mittelbohrung 7 des Düsenhalters 1 auf dessen Stirnseite 16 zusammenfällt. Dadurch erübrigen sich zusätzliche Dichtungsmaßnahmen zur Abdichtung des Nadelschließfederraums. Der Ort D bildet somit den Scheitelpunkt für den zwischen 0,5° und 3,0° betrage¬ nden Winkelγ, welcher eine zur Stirnseite 16 des Düsenhalters 1 entsprechend schräg verlaufende Rest- flache 21 definiert. Die Restfläche 21 bildet somit die Dichtkante bei D. Durch die Dichtkante ergibt sich unter der Spannwirkung der Düsenspannmutter 10 eine die Dichtwirkung erhöhende zusätzliche Barriere zwischen dem durch die beiden Druckkanäle 2, 4 gebil¬ deten Hochdruckteil einerseits und dem Niederdruck¬ teil, der durch die zentralen Innenräume im Düsenhal¬ ter 1 und im Düsenkörper 3 begrenzt ist.The high-pressure area is sealed off from the low-pressure area in that, as in FIG. 2 enlarged, a sealing edge extends concentrically through the face D 16 of the nozzle holder 1 through the location D coinciding with the wall of the needle closing spring chamber, such that the sealing edge coincides with the central bore 7 of the nozzle holder 1 on its end face 16. This eliminates the need for additional sealing measures to seal the needle closing spring chamber. The location D thus forms the apex for the angle γ between 0.5 ° and 3.0 °, which defines a residual flat surface 21 which runs obliquely to the end face 16 of the nozzle holder 1. The remaining surface 21 thus forms the sealing edge at D. The sealing edge results in an additional barrier increasing the sealing effect between the high-pressure part formed by the two pressure channels 2, 4 on the one hand and the low-pressure part which is formed by the central interiors in the nozzle holder 1 and in the nozzle body 3 is limited.
Für die Dichtwirkung des Dichtkonus 18 ist sehr wesentlich, daß dieser mit zunehmendem Aufschrauben der Düsenspannmutter 10 sich im Sinne einer Zentrie¬ rung selbst positionieren kann, während er sich geringfügig verformt, wie in Fig. 3 dargestellt.For the sealing effect of the sealing cone 18, it is very important that the latter can position itself in the sense of centering with increasing screwing on of the nozzle clamping nut 10, while it deforms slightly, as shown in FIG. 3.
Die Fig. 4 und 5 zeigen jeweils eine Variante der hochdruckseitigen Druckkanaldichtung in einer Ausschnittsvergrδßerung gemäß Fig. 2. Bei Fig. 4 besteht die Abweichung gegenüber Fig. 2 darin, daß der Dichtkonus 18 ersetzt ist durch einen Dichtring 22, welcher im wesentlichen aus zwei außenseitig entgegengesetzt konischen Abschnitten 26, 27 besteht, deren Konusflächen sich zum jeweiligen Ende des Dichtrings 22 hin verjüngen. Während der obere
Abschnitt 26 wie zu Fig. 2 beschrieben im unteren Ende des Druckkanals 2 aufgenommen ist, tritt der untere Abschnitt 27 in eine entsprechend konisch ausgeweitete Mündung 23 der Druckkanalbohrung 2a der Zwischenscheibe 13 auf deren Oberseite 15 ein. Durch die auf diese Weise gegenüber Fig. 3 erzielte Vergrö¬ ßerung der Dichtflächen wird die Dichtwirkung noch verbessert. Gleiches gilt für die Variante gemäß Fig. 5. Dort kommt ein Dichtröhrchen 25 zum Einsatz, welches wie der Dichtring 22 (Fig. 4) zwei konische Abschnitte 26, 27 an den beiden Enden aufweist, die an einem hohlzylindrischen Mittelabschnitt 24 angesetzt sind, welcher von einer Stützbohrung 29 der Zwischenscheibe 13 eng umfaßt ist. Während der obere Abschnitt 26 wie zu Fig. 2 beschrieben im konischen Sitz 19 des Druckkanals 2 aufgenommen ist, tritt der untere Abschnitt 27 in eine entsprechend konisch aufgeweitete Mündung 28 des Druckkanals 4 des Düsenkörpers 3 ein.
4 and 5 each show a variant of the high-pressure side pressure channel seal in a detail enlargement according to FIG. 2. In FIG. 4, the difference with respect to FIG. 2 is that the sealing cone 18 is replaced by a sealing ring 22, which essentially consists of two on the outside there is conical sections 26, 27, the conical surfaces of which taper towards the respective end of the sealing ring 22. While the top Section 26, as described in relation to FIG. 2, is received in the lower end of the pressure channel 2, the lower section 27 enters a correspondingly conically widened mouth 23 of the pressure channel bore 2a of the intermediate disk 13 on its upper side 15. The sealing effect is further improved by the enlargement of the sealing surfaces compared to FIG. 3. The same applies to the variant according to FIG. 5. There, a sealing tube 25 is used which, like the sealing ring 22 (FIG. 4), has two conical sections 26, 27 at the two ends, which are attached to a hollow cylindrical central section 24, which is closely surrounded by a support hole 29 of the intermediate plate 13. While the upper section 26 is received in the conical seat 19 of the pressure channel 2 as described in relation to FIG. 2, the lower section 27 enters a correspondingly conically widened mouth 28 of the pressure channel 4 of the nozzle body 3.
Claims
AnsprücheExpectations
Einspritzvorrichtung für Dieselmotoren mit einem Düsenhalter (1), dessen Druckkanal (2, 4) einer¬ seits mit der Einspritzpumpe, andererseits mit der Düse verbunden ist, wobei der Düsenhalter (1) gegenüber einem die Düsennadel (5) in Längsrich¬ tung verschieblich aufnehmenden Düsenkörper (3) mittels einer Zwischenscheibe (13) dichtend abgestützt ist, wobei ein verformbarer metallener hohlzylmdrischer Dichtkörper (18) sich mit einem Ende gegen eine Dichtfläche abstützt und mit zunehmendem Anziehen der den Düsenkörper (3) mit dem Düsenhalter (1) verbindenden Düsenspannmutter (10) zunehmend gegen seinen Sitz verformt, dadurch gekennzeichnet, daß der Dichtkörper (18) mit dem anderen Ende in einen sich zur Mündung des Druckkanals (2) hin erweiternden konischen Sitz (19) im Düsenhalter (1) eingreift, und daß die Stirnseite (16) des Düsenhalters (1) kegelstumpfförmig ausgebildet ist und die Restfläche (21) mit der Oberseite (15) der Zwischenscheibe (13) einen leichten Kegelwinkel (γ) bildet, wodurch eine konzentri¬ sche Dichtkante (D) gebildet wird.Injection device for diesel engines with a nozzle holder (1), the pressure channel (2, 4) of which is connected on the one hand to the injection pump and on the other hand to the nozzle, the nozzle holder (1) being displaceable in the longitudinal direction relative to a nozzle needle (5) Nozzle body (3) is supported sealingly by means of an intermediate disc (13), one deformable metal hollow cylindrical sealing body (18) being supported at one end against a sealing surface and with increasing tightening of the nozzle clamping nut (3) connecting the nozzle body (3) to the nozzle holder (1) 10) increasingly deformed against its seat, characterized in that the sealing body (18) engages with the other end in a conical seat (19) which widens towards the mouth of the pressure channel (2) in the nozzle holder (1), and in that the end face ( 16) of the nozzle holder (1) is frustoconical and the remaining surface (21) with the top (15) of the intermediate disc (13) is light n cone angle (γ) forms, whereby a concentric sealing edge (D) is formed.
Einspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Dichtkδrper als Dichtkonus (18) mit dem konischen Sitz (19) im Düsenhalter (1) entspre¬ chender konischer Außenform ausgebildet ist und daß die Gegen-Dichtflache, auf welcher sich der
Dichtkonus (18) abstützt, durch die Oberseite (15) der Zwischenscheibe (13) gebildet ist.Injection device according to claim 1, characterized in that the sealing body is designed as a sealing cone (18) with the conical seat (19) in the nozzle holder (1) corresponding conical outer shape and that the counter-sealing surface on which the Supported sealing cone (18) is formed by the top (15) of the intermediate washer (13).
Einspritzvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Dichtkonus (18) in axialer Richtung kürzer bemessen ist als der Sitz (19) , in dem er aufgenommen ist.Injection device according to claim 2, characterized in that the sealing cone (18) is dimensioned shorter in the axial direction than the seat (19) in which it is received.
Einspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Dichtkörper als Dichtring (22) mit zwei außenseitig entgegengesetzt konischen Abschnitten (26, 27) ausgebildet ist, wobei ein Abschnitt (26) entsprechend dem konischen Sitz (19) im Düsenhalter (1) , der andere Abschnitt (27) entsprechend einer konisch aufgeweiteten MündungInjection device according to Claim 1, characterized in that the sealing body is designed as a sealing ring (22) with two conical sections (26, 27) which are oppositely opposed on the outside, a section (26) corresponding to the conical seat (19) in the nozzle holder (1) which other section (27) corresponding to a conically widened mouth
(23) der Druckkanalbohrung (2a) der Zwischen¬ scheibe (13) ausgebildet ist und wobei die Gegen- Dichtflache durch die Mündung (23) der Druck¬ kanalbohrung (2a) der Zwischenscheibe (13) gebildet ist.(23) of the pressure channel bore (2a) of the intermediate disk (13) is formed and the counter sealing surface is formed by the mouth (23) of the pressure channel bore (2a) of the intermediate disk (13).
Einspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Dichtkörper als Dichtröhrchen (25) mit zwei außenseitig entgegengesetzt konischen Abschnitten (26, 27) an den gegenüberliegenden Enden eines hohlzylindrischen MittelabschnittsInjection device according to claim 1, characterized in that the sealing body as a sealing tube (25) with two conical sections (26, 27) oppositely opposed on the outside at the opposite ends of a hollow cylindrical central section
(24) ausgebildet ist, wobei ein Abschnitt (26) entsprechend dem konischen Sitz (19) im Düsenhal¬ ter (1) , der andere Abschnitt (27) entsprechend einer konisch aufgeweiteten Mündung (28) des
Druckkanals (4) des Düsenkörpers (3) ausgebildet ist und wobei das Dichtröhrchen (25) mit seinem Mittelabschnitt (24) von einer entsprechenden Stützbohrung (29) der Zwischenscheibe (13) eng umfaßt ist und die Gegen-Dichtflache durch die Mündung (28) des Druckkanals (4) des Düsenkörpers (3) gebildet ist.(24) is formed, one section (26) corresponding to the conical seat (19) in the nozzle holder (1), the other section (27) corresponding to a conically widened mouth (28) of the Pressure channel (4) of the nozzle body (3) is formed and the sealing tube (25) with its central portion (24) is closely surrounded by a corresponding support hole (29) of the intermediate disk (13) and the counter-sealing surface through the mouth (28) of the pressure channel (4) of the nozzle body (3) is formed.
Einspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Durchmesser des durch die Dichtkante beschriebenen Kreises gleich dem der die Druckfe¬ der (8) aufnehmenden Mittelbohrung des Düsenhal¬ ters (1) ist.
Injection device according to claim 1, characterized in that the diameter of the circle described by the sealing edge is equal to that of the central bore of the nozzle holder (1) receiving the pressure spring (8).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19614980 | 1996-04-16 | ||
| DE19614980A DE19614980C1 (en) | 1996-04-16 | 1996-04-16 | Injector |
| PCT/EP1997/001293 WO1997039237A1 (en) | 1996-04-16 | 1997-03-14 | Injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0894194A1 true EP0894194A1 (en) | 1999-02-03 |
| EP0894194B1 EP0894194B1 (en) | 2001-12-19 |
Family
ID=7791411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97908235A Expired - Lifetime EP0894194B1 (en) | 1996-04-16 | 1997-03-14 | Injection device |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0894194B1 (en) |
| JP (1) | JP3737126B2 (en) |
| KR (1) | KR100440819B1 (en) |
| CN (1) | CN1072771C (en) |
| AT (1) | ATE211217T1 (en) |
| BR (1) | BR9708571A (en) |
| CZ (1) | CZ289269B6 (en) |
| DE (2) | DE19614980C1 (en) |
| IN (1) | IN192023B (en) |
| TR (1) | TR199802094T2 (en) |
| WO (1) | WO1997039237A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19914720B4 (en) * | 1999-03-31 | 2005-10-13 | Siemens Ag | Fuel injection valve for an internal combustion engine |
| DE19915685A1 (en) * | 1999-04-07 | 2000-10-12 | Delphi Tech Inc | Injection valve for fuel injection in an internal combustion engine |
| DE10008554A1 (en) * | 2000-02-24 | 2001-08-30 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
| DE10155677A1 (en) * | 2001-11-13 | 2003-05-22 | Bosch Gmbh Robert | Fuel injection valve, for an IC motor, has a housing with two bodies and a high pressure fuel channel through the dividing line between them, with an inner seal with elastic distortion at the junction between the bodies |
| DE102004022428A1 (en) * | 2004-05-06 | 2005-12-01 | Siemens Ag | Injection valve for internal combustion engines |
| DE102008056519A1 (en) * | 2008-11-08 | 2010-05-12 | Man Diesel Se | Sealing system for sealing high pressure sealing area between components and component section of fuel-injection valve of combustion engine, has channels and channel section, which are integrated in components and component sections |
| AT511716B1 (en) * | 2011-12-09 | 2013-02-15 | Bosch Gmbh Robert | CONNECTION OF HIGH PRESSURE MEDIUM LEADING COMPONENTS OF AN INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE685057C (en) * | 1933-12-28 | 1939-12-11 | Bosch Gmbh Robert | Arrangement for regulating the amount of fuel injected in vehicle diesel engines |
| DE866423C (en) * | 1951-10-04 | 1953-02-09 | Eduard Dr Inden | Pipe connection or pipe coupling |
| FR2341751A1 (en) * | 1976-02-20 | 1977-09-16 | Semt | PROCEDURE AND DEVICE FOR REDUCING THE RISK OF LEAKING INJECTION FUEL, ESPECIALLY IN THE COOLING CIRCUIT OF THE INJECTORS OF A DIESEL ENGINE |
| JPS6066222A (en) * | 1983-09-21 | 1985-04-16 | Olympus Optical Co Ltd | Endoscope |
| DE3819729A1 (en) * | 1987-11-30 | 1989-06-08 | Ernst Nock | PIPE CONNECTION |
| US5205492A (en) * | 1991-12-16 | 1993-04-27 | Gregory Khinchuk | Fuel injection valve |
| JPH0666222A (en) * | 1992-08-19 | 1994-03-08 | Nippondenso Co Ltd | Fuel injector |
-
1996
- 1996-04-16 DE DE19614980A patent/DE19614980C1/en not_active Expired - Fee Related
-
1997
- 1997-03-14 DE DE59705893T patent/DE59705893D1/en not_active Expired - Fee Related
- 1997-03-14 KR KR10-1998-0706042A patent/KR100440819B1/en not_active IP Right Cessation
- 1997-03-14 BR BR9708571A patent/BR9708571A/en not_active IP Right Cessation
- 1997-03-14 JP JP53667997A patent/JP3737126B2/en not_active Expired - Fee Related
- 1997-03-14 TR TR1998/02094T patent/TR199802094T2/en unknown
- 1997-03-14 EP EP97908235A patent/EP0894194B1/en not_active Expired - Lifetime
- 1997-03-14 CZ CZ19983077A patent/CZ289269B6/en not_active IP Right Cessation
- 1997-03-14 AT AT97908235T patent/ATE211217T1/en not_active IP Right Cessation
- 1997-03-14 CN CN97193354A patent/CN1072771C/en not_active Expired - Fee Related
- 1997-03-14 WO PCT/EP1997/001293 patent/WO1997039237A1/en active IP Right Grant
- 1997-04-03 IN IN591CA1997 patent/IN192023B/en unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9739237A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| TR199802094T2 (en) | 1999-03-22 |
| CZ307798A3 (en) | 1999-06-16 |
| ATE211217T1 (en) | 2002-01-15 |
| DE59705893D1 (en) | 2002-01-31 |
| KR19990082312A (en) | 1999-11-25 |
| JP2000508733A (en) | 2000-07-11 |
| CN1214759A (en) | 1999-04-21 |
| JP3737126B2 (en) | 2006-01-18 |
| EP0894194B1 (en) | 2001-12-19 |
| WO1997039237A1 (en) | 1997-10-23 |
| BR9708571A (en) | 1999-08-03 |
| CZ289269B6 (en) | 2001-12-12 |
| DE19614980C1 (en) | 1997-09-18 |
| KR100440819B1 (en) | 2004-10-15 |
| IN192023B (en) | 2004-02-07 |
| CN1072771C (en) | 2001-10-10 |
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