EP0533962A1 - Internal combustion engine with injection system - Google Patents

Internal combustion engine with injection system Download PDF

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Publication number
EP0533962A1
EP0533962A1 EP91114136A EP91114136A EP0533962A1 EP 0533962 A1 EP0533962 A1 EP 0533962A1 EP 91114136 A EP91114136 A EP 91114136A EP 91114136 A EP91114136 A EP 91114136A EP 0533962 A1 EP0533962 A1 EP 0533962A1
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EP
European Patent Office
Prior art keywords
combustion engine
internal combustion
pump
pressure piece
engine according
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
Application number
EP91114136A
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German (de)
French (fr)
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EP0533962B1 (en
Inventor
Siegfried Dipl.-Ing. Glaeske
Claus Kühl
Reinhard Dipl.-Ing. Häfner
Hans Dipl.-Ing. Heinsohn
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Caterpillar Motoren GmbH and Co KG
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Krupp Mak Maschinenbau GmbH
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Publication of EP0533962A1 publication Critical patent/EP0533962A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • 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

Definitions

  • the invention relates to an internal combustion engine with an injection system according to the preamble of claim 1.
  • Cylinder heads are known from US Pat. No. 3,845,748, in which the fuel supply to the injection valve takes place via a line led through the cylinder head, which is arranged in a pipe casing and is clamped to the injection valve by means of a pressure screw.
  • a conical tip of the pipe end is received by a corresponding opening in the valve body.
  • the other end of the line is connected to an injection pump, which is arranged approximately parallel to the valve.
  • a connecting line between an injection valve and an injection pump is known, which consists of a tube and a subsequent line, which are clamped together. Due to the position of the injection pump to the valve, the exposed line coming from the pump is bent at right angles. Due to their low elasticity, these types of lines have the disadvantage that vibrations can often damage the pump or the valve, or the relatively free movement of the line means that a tight connection u # in the connection area of the line to the pipe is not completely guaranteed.
  • the object of the invention is to provide a fuel line between an injection valve and an injection pump that bridges deviations of the various connection points during assembly and allows elastic movements between the injection pump and cylinder head within limits, without leaks occurring between the lines and to the injection nozzle and the pump .
  • the fuel line comprises straight line parts which form tensionable pressure pieces and connect the injection pump to the injection valve.
  • the pipelines are tightly connected to the units and to one another in a structurally simple manner via a central clamping bolt in a receptacle housing on the cylinder head.
  • the cylinder head takes over the introduction of force for connecting the lines to one another and to the injection valve and to the injection pump.
  • Tolerance differences can be easily accommodated in the vertical and transverse directions by sliding on the flat sealing surfaces. Even in the transverse direction, an adjustment of these surfaces is easily possible on the injection valve, even by turning it slightly.
  • the tolerance compensation in the transverse direction with regard to the meeting of the radial pressure piece and the cross pressure piece is achieved in that, in addition to the exact dimensional adjustment, both the adapter surface on the cross pressure piece is made very elastic, and the diameter design of the radial pressure piece outside the guide in the cylinder head in its cylindrical part towards the cross pressure piece is very great is designed to be elastic.
  • the shape of the cylindrical receptacle housing preferably cast on to the cylinder head, is designed such that it when the radial pressure piece grows under the heat of the heavy oil compared to the colder cylinder head as a tubular spring.
  • the pump-side receiving housing which holds the transverse pressure piece clamped, is designed as a tubular spring.
  • the pressure and tension screws can also be shaped with spring properties, such as, for example, by plate springs.
  • An internal combustion engine comprises a cylinder head 1 with an integrated injection system, which essentially comprises an injection valve 2 and an injection pump 3. This is arranged immediately adjacent to a receiving housing 4 cast onto the cylinder head 1, which has a receiving channel 5 for a line 7 leading to the pump 3 and consisting of a transverse pressure piece 6 and is held in a pre-tensioned manner in a pump housing 3a, 3b by means of a clamping screw 8.
  • This cross-pressure piece 6 is used to connect another line 10, which leads to the injection valve 2 and consists of a radial pressure piece 9, in the meeting corner area 11 of the two lines 7 and 10 and is clamped together in a liquid-tight manner by means of the tensioning screw 8.
  • the pressure pieces 6 and 9 are arranged at right angles to one another, the radial pressure piece 9 being guided in a bore 12 in the cylinder head 1 up to the injection valve 2. It opens with its free end 13 facing away from the valve 2 into the cast-on housing 4.
  • the transverse pressure piece 6 extends as far as the pump housing 3a, 3b, in that its free end 13a is clamped against a pump element 16 by means of a pressure screw 15 .
  • the receiving housing 4 is connected to the pump housing 3a, 3b via a sliding sleeve 17, through which the transverse pressure piece 6 also runs encapsulated.
  • the radial thrust piece 9 has circumferentially spaced circumferential rings 18 which position it exactly in the bore 12, the precise position of the thrust pieces 6 via the tension screw 8 arranged coaxially with this thrust piece 9 in cooperation with the pressure screw 15 in the pump housing 3a, 3b , 9 is set at right angles to each other.
  • the line connection is made via flat sealing surfaces 19, 20, which are each aligned parallel to one another, e.g. is shown in more detail in Fig. 4.
  • the sealing surfaces 21, 22 between the injection valve 2 and the radial pressure piece 9 and the sealing surfaces 23, 24 between the cross pressure piece 6 and the pump 3 are formed.
  • the receptacle housing 4 and the pump housing 3b form so-called tubular springs which, due to their defined configuration as tubular elements in cross section, are elastically flexible within certain limits, in particular when the radial pressure piece 9 or the transverse pressure piece 6 is elongated.
  • the lines 7 and 10 formed from the pressure pieces 6 and 9 are encapsulated by the pump 3 to the injection valve 2 either via the housing 3a, 3b, 4 and via the sliding sleeve 17 and via the bore 12 in the cylinder head 1, so that an exit from Medium is prevented from the outside.
  • tensioning or pressure screws 8 and 15 tension the pressure pieces 6 and 9 over flat end faces 25, 26.
  • ball elements which are not shown in more detail, can also be arranged in the end face of the screws 8 and 15, which are then directed towards the pressure pieces 6 and 9.
  • connection of the transverse pressure piece 6 to the injection pump 3 can, as shown in FIGS. 2 and 3, be selected in various forms.
  • a flat high-pressure seal is preferably also used here, but a hardened cone connection (cone 16a) is also conceivable.
  • the housing 3a is preferably designed as a tubular spring. However, it can also get the pressure screw 15 assigned elastic properties.

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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

A description is given of an internal combustion engine with an injection system in which the injection valve (2) is connected to the pump (3) via encapsulated pressure lines (6, 7). The pressure lines (6, 7) are arranged at right angles to one another and comprise a radial pressure section (9) and a transverse pressure section (6), which are clamped relative to one another and assume a centered position relative to one another. A leak-tight connection between the lines and with the injection pump (3) and injection valve (2) is effected via flat sealing surfaces (19-24) which are arranged parallel to one another. The pressure sections (6, 9) are secured in housings (3a, 3b, 4) which are designed as tube springs which yield elastically if the pressure sections expand. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Brennkraftmaschine mit einem Einspritzsystem nach dem Oberbegriff des Anspruchs 1.The invention relates to an internal combustion engine with an injection system according to the preamble of claim 1.

Es sind Zylinderköpfe aus der US-PS 3 845 748 bekannt, bei denen die Kraftstoffzufuhr zum Einspritzventil über eine durch den Zylinderkopf geführte Leitung erfolgt, die in einer Rohrverschalung angeordnet ist und mit dem Einspritzventil über eine Druckschraube verspannt wird. Hierbei wird eine kegelige Spitze des Rohrendes von einer entsprechenden Öffnung im Ventilkörper aufgenommen. Das andere Ende der Leitung ist mit einer Einspritzpumpe, die etwa parallel liegend zum Ventil angeordnet ist, verbunden. Desweiteren ist aus der DE-A 31 28 523 eine Verbindungsleitung zwischen einem Einspritzventil und einer Einspritzpumpe bekannt, die aus einem Rohr und einer anschließenden Leitung besteht, welche miteinander verspannt werden. Aufgrund der Lage der Einspritzpumpe zum Ventil ist die von der Pumpe abgehende freiliegende Leitung rechtwinklig abgebogen. Diese Art von Leitungen haben durch eine geringe Elastizität den Nachteil, daß Vibrationen häufig zu Beschädigungen der Pumpe bzw. des Ventils führen können bzw. durch die relativ freibewegliche Anordnung der Leitung ist eine dichte Verbindung u#im Anschlußbereich der Leitung zum Rohr nicht vollständig gewährleistet.Cylinder heads are known from US Pat. No. 3,845,748, in which the fuel supply to the injection valve takes place via a line led through the cylinder head, which is arranged in a pipe casing and is clamped to the injection valve by means of a pressure screw. Here, a conical tip of the pipe end is received by a corresponding opening in the valve body. The other end of the line is connected to an injection pump, which is arranged approximately parallel to the valve. Furthermore, from DE-A 31 28 523 a connecting line between an injection valve and an injection pump is known, which consists of a tube and a subsequent line, which are clamped together. Due to the position of the injection pump to the valve, the exposed line coming from the pump is bent at right angles. Due to their low elasticity, these types of lines have the disadvantage that vibrations can often damage the pump or the valve, or the relatively free movement of the line means that a tight connection u # in the connection area of the line to the pipe is not completely guaranteed.

Aufgabe der Erfindung ist es, eine Kraftstoffleitung zwischen einem Einspritzventil und einer Einspritzpumpe zu schaffen, die bei einer Montage Abweichungen der verschiedenen Anschlußpunkte überbrückt und elastische Bewegungen zwischen Einspritzpumpe und Zylinderkopf in Grenzen zuläßt, ohne daß Undichtigkeiten zwischen den Leitungen sowie zur Einspritzdüse und zur Pumpe auftreten.The object of the invention is to provide a fuel line between an injection valve and an injection pump that bridges deviations of the various connection points during assembly and allows elastic movements between the injection pump and cylinder head within limits, without leaks occurring between the lines and to the injection nozzle and the pump .

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Weitere vorteilhafte Merkmale beinhalten die Unteransprüche.This object is achieved by the characterizing features of claim 1. The dependent claims contain further advantageous features.

Die mit der Erfindung hauptsächlich erzielten Vorteile bestehen darin, daß die Kraftstoffleitung gerade Leitungsteile umfaßt, die spannbare Druckstücke bilden und die Einspritzpumpe mit dem Einspritzventil verbinden. Die dichte Verbindung der Rohrleitungen mit den Aggregaten und untereinander erfolgt in baulich einfacher Weise über einen zentralen Spannbolzen in einem Aufnahmegehäuse am Zylinderkopf. Hierdurch wird insbesondere aufgrund einer speziellen Verbindung zwischen den Leitungen und Aggregaten über planparallele Dichtflächen einerseits und planen bzw. kugelförmigen Druckelementen andererseits eine gewisse Elastizität bzw. Beweglichkeit der beiden Leitungen zueinander erzielt, wodurch Motordeformationen und Relativbewegungen zwischen Pumpe und Zylinderkopf ausgleichbar sind, ohne daß Dichtungsprobleme auftreten können.The main advantages achieved with the invention are that the fuel line comprises straight line parts which form tensionable pressure pieces and connect the injection pump to the injection valve. The pipelines are tightly connected to the units and to one another in a structurally simple manner via a central clamping bolt in a receptacle housing on the cylinder head. As a result, in particular due to a special connection between the lines and units via plane-parallel sealing surfaces on the one hand and plane or spherical pressure elements on the other hand, a certain elasticity or mobility of the two lines with respect to one another is achieved, as a result of which engine deformations and relative movements between the pump and the cylinder head can be compensated for without any sealing problems occurring can.

Der Zylinderkopf übernimmt durch die erfindungsgemäße Ausbildung und Anordnung der beiden Leitungen die Krafteinleitung für die Verbindung der Leitungen untereinander und mit dem Einspritzventil und mit der Einspritzpumpe.Due to the inventive design and arrangement of the two lines, the cylinder head takes over the introduction of force for connecting the lines to one another and to the injection valve and to the injection pump.

Es hat sich als vorteilhaft herausgestellt, daß bei Höchstdruckverbindungen ebene Dichtflächen erforderlich sind. Diese haben genau auf die Druckkräfte ausgelegte Ringflächen, die zwar ein geringfügiges elastoplastisches Deformieren gestatten, aber unter den notwendigen Vorspannkräften ein Setzen im größeren Maße nicht aufweisen. Um diese ebenen Dichtflächen gezielt einzusetzen, muß darauf geachtet werden, daß diese Flächen im Montagezustand so planparallel wie möglich aufeinander treffen können. Aus diesem Grund wird das Radialdruckstück im Zylinderkopf genau geführt, um seine rechtwinklige Lage gegenüber der Achse des Einspritzventils im Zylinderkopf zu erzwingen. Ebenso wird die Länge des Radialdruckstückes gegenüber der Einspritzpumpe so bestimmt, daß das Querdruckstück exakt rechtwinklig zum Radialdruckstück verläuft. Toleranzunterschiede können in Hoch- und Querrichtung durch Rutschen auf den ebenen Dichtflächen ohne weiteres aufgenommen werden. Auch in Querrichtung ist am Einspritzventil selbst durch leichtes Drehen desselben eine Anpassung dieser Flächen ohne weiteres möglich. Der Toleranzausgleich in Querrichtung bezüglich des Zusammentreffens von Radialdruckstück und Querdruckstück wird dadurch erzielt, daß neben der exakten maßlichen Abstimmung sowohl die Anpaßfläche am Querdruckstück sehr elastisch ausgeführt wird, als auch die Durchmessergestaltung des Radialdruckstückes außerhalb der Führung im Zylinderkopf in seinem zylindrischen Teil zum Querdruckstück hin sehr elastisch gestaltet wird.It has been found to be advantageous that flat sealing surfaces are required for high-pressure connections. These have ring surfaces designed precisely for the compressive forces, which allow a slight elastoplastic deformation, but do not have a greater degree of setting under the necessary prestressing forces. In order to use these flat sealing surfaces in a targeted manner, care must be taken that these surfaces can meet each other as plane-parallel as possible in the assembled state. For this reason, the radial pressure piece is precisely guided in the cylinder head in order to force it to be at right angles to the axis of the injection valve in the cylinder head. Likewise, the length of the radial pressure piece with respect to the injection pump is determined so that the transverse pressure piece runs exactly at right angles to the radial pressure piece. Tolerance differences can be easily accommodated in the vertical and transverse directions by sliding on the flat sealing surfaces. Even in the transverse direction, an adjustment of these surfaces is easily possible on the injection valve, even by turning it slightly. The tolerance compensation in the transverse direction with regard to the meeting of the radial pressure piece and the cross pressure piece is achieved in that, in addition to the exact dimensional adjustment, both the adapter surface on the cross pressure piece is made very elastic, and the diameter design of the radial pressure piece outside the guide in the cylinder head in its cylindrical part towards the cross pressure piece is very great is designed to be elastic.

Gegenüber den im Motorbetrieb auftretenden low-cycle and high-cycle-Beanspruchungen ist in den Radialdruckstücken und im Querdruckstück eine hinreichende Elastizität zum gegenseitigen Anpassen gegeben. Das vorzugsweise am Zylinderkopf angegossene zylinderförmige Aufnahmegehäuse ist in seiner Form so gestaltet, daß es beim Wachsen des Radialdruckstücks unter der Wärme des Schweröls gegenüber dem kälteren Zylinderkopf als Rohrfeder elastisch nachgeben kann. Ebenfalls ist aus diesem Grund das pumpenseitige Aufnahmegehäuse, welches das Querdruckstück eingespannt hält, als Rohrfeder ausgeführt. In besonderer Ausgestaltung der Erfindung können aber auch die Druck- und Spannschrauben mit Federungseigenschaften, wie z.B. durch Tellerfedern, geprägt sein.Compared to the low-cycle and high-cycle stresses that occur in engine operation, there is sufficient elasticity in the radial pressure pieces and in the transverse pressure piece for mutual adaptation. The shape of the cylindrical receptacle housing, preferably cast on to the cylinder head, is designed such that it when the radial pressure piece grows under the heat of the heavy oil compared to the colder cylinder head as a tubular spring. For this reason, too, the pump-side receiving housing, which holds the transverse pressure piece clamped, is designed as a tubular spring. In a special embodiment of the invention, however, the pressure and tension screws can also be shaped with spring properties, such as, for example, by plate springs.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen:

Fig. 1
eine Ansicht auf die als Radial- und Querdruckstück ausgebildete Verbindungsleitung zwischen Pumpe und Einspritzventil,
Fig. 2
eine vergrößerte Darstellung einer Spannverbindung des Querdruckstücks durch eine Druckschraube an einer Pumpe mit planen Dicht- und Preßflächen,
Fig. 3
eine vergrößerte Darstellung der Verbindung zwischen der Pumpe mit Konusaufnahme am Querdruckstück,
Fig. 4
eine Darstellung des Radialdruckstücks mit Verbindung zum Querdruckstück,
Fig. 5
eine Darstellung des als Rohrfeder ausgebildeten pumpenseitigen Aufnahmegehäuses und
Fig. 6
eine Draufsicht zu Fig. 5.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
Fig. 1
1 shows a view of the connecting line between the pump and the injection valve, which is designed as a radial and transverse pressure piece,
Fig. 2
an enlarged view of a clamping connection of the cross pressure piece by a pressure screw on a pump with flat sealing and pressing surfaces,
Fig. 3
an enlarged view of the connection between the pump with cone mount on the cross pressure piece,
Fig. 4
a representation of the radial pressure piece with connection to the transverse pressure piece,
Fig. 5
a representation of the pump-side receiving housing designed as a tubular spring and
Fig. 6
5 shows a plan view of FIG. 5.

Eine Brennkraftmaschine umfaßt einen Zylinderkopf 1 mit einem integrierten Einspritzsystem, das im wesentlichen ein Einspritzventil 2 und eine Einspritzpumpe 3 umfaßt. Diese ist unmittelbar benachbart eines am Zylinderkopf 1 angegossenen Aufnahmegehäuses 4 angeordnet, das einen Aufnahmekanal 5 für eine zur Pumpe 3 geführte, aus einem Querdruckstück 6 bestehende Leitung 7 aufweist und in einem Pumpengehäuse 3a,3b mittels einer Spannschraube 8 vorgespannt gehalten ist. Mit diesem Querdruckstück 6 ist eine zum Einspritzventil 2 geführte weitere, aus einem Radialdruckstück 9 bestehende Leitung 10 im zusammentreffenden Eckbereich 11 der beiden Leitungen 7 und 10 verbunden und über die Spannschraube 8 flüssigkeitsdicht zusammengespannt.An internal combustion engine comprises a cylinder head 1 with an integrated injection system, which essentially comprises an injection valve 2 and an injection pump 3. This is arranged immediately adjacent to a receiving housing 4 cast onto the cylinder head 1, which has a receiving channel 5 for a line 7 leading to the pump 3 and consisting of a transverse pressure piece 6 and is held in a pre-tensioned manner in a pump housing 3a, 3b by means of a clamping screw 8. This cross-pressure piece 6 is used to connect another line 10, which leads to the injection valve 2 and consists of a radial pressure piece 9, in the meeting corner area 11 of the two lines 7 and 10 and is clamped together in a liquid-tight manner by means of the tensioning screw 8.

Die Druckstücke 6 und 9 sind rechtwinklig zueinander angeordnet, wobei das Radialdruckstück 9 in einer Bohrung 12 des Zylinderkopfes 1 bis zum Einspritzventil 2 geführt ist. Es mündet mit seinem dem Ventil 2 abgekehrten freien Ende 13 in das angegossene Gehäuse 4. Ausgehend von diesem Gehäuse 4 verläuft das Querdruckstück 6 bis zum Pumpengehäuse 3a,3b, indem es mit seinem freien Ende 13a über eine Druckschraube 15 gegen ein Pumpenelement 16 gespannt ist. Das Aufnahmegehäuse 4 ist mit dem Pumpengehäuse 3a,3b über eine Schiebehülse 17 verbunden, durch das auch das Querdruckstück 6 gekapselt verläuft.The pressure pieces 6 and 9 are arranged at right angles to one another, the radial pressure piece 9 being guided in a bore 12 in the cylinder head 1 up to the injection valve 2. It opens with its free end 13 facing away from the valve 2 into the cast-on housing 4. Starting from this housing 4, the transverse pressure piece 6 extends as far as the pump housing 3a, 3b, in that its free end 13a is clamped against a pump element 16 by means of a pressure screw 15 . The receiving housing 4 is connected to the pump housing 3a, 3b via a sliding sleeve 17, through which the transverse pressure piece 6 also runs encapsulated.

Das Radialdruckstück 9 weist am Umfang im Abstand angeordnete Umfangsringe 18 auf, die es in der Bohrung 12 exakt positionieren, wobei über die koaxial zu diesem Druckstück 9 angeordnete Spannschraube 8 im Zusammenwirken mit der Druckschraube 15 im Pumpengehäuse 3a,3b eine genaue Lage der Druckstücke 6,9 im rechten Winkel zueinander festgelegt ist.The radial thrust piece 9 has circumferentially spaced circumferential rings 18 which position it exactly in the bore 12, the precise position of the thrust pieces 6 via the tension screw 8 arranged coaxially with this thrust piece 9 in cooperation with the pressure screw 15 in the pump housing 3a, 3b , 9 is set at right angles to each other.

Die Leitungsverbindung erfolgt über plane Dichtflächen 19,20, die jeweils parallel zueinander ausgerichtet sind, wie z.B. in Fig. 4 näher dargestellt ist. Ebenso sind die Dichtflächen 21,22 zwischen Einspritzventil 2 und Radialdruckstück 9 und die Dichtflächen 23,24 zwischen dem Querdruckstück 6 und der Pumpe 3 ausgebildet.The line connection is made via flat sealing surfaces 19, 20, which are each aligned parallel to one another, e.g. is shown in more detail in Fig. 4. Likewise, the sealing surfaces 21, 22 between the injection valve 2 and the radial pressure piece 9 and the sealing surfaces 23, 24 between the cross pressure piece 6 and the pump 3 are formed.

Das Aufnahmegehäuse 4 sowie das Pumpengehäuse 3b bilden sogenannte Rohrfedern, die aufgrund ihrer definierten Ausbildung als im Querschnitt rohrförmige Elemente, in gewissen Grenzen elastisch nachgiebig sind, insbesondere bei einer Längung des Radialdruckstückes 9 bzw. des Querdruckstückes 6.The receptacle housing 4 and the pump housing 3b form so-called tubular springs which, due to their defined configuration as tubular elements in cross section, are elastically flexible within certain limits, in particular when the radial pressure piece 9 or the transverse pressure piece 6 is elongated.

Die aus den Druckstücken 6 und 9 gebildeten Leitungen 7 und 10 sind von der Pumpe 3 bis zum Einspritzventil 2 entweder über die Gehäuse 3a,3b,4 und über die Schiebehülse 17 sowie über die Bohrung 12 im Zylinderkopf 1 gekapselt, so daß ein Austritt von Medium nach außen unterbunden wird.The lines 7 and 10 formed from the pressure pieces 6 and 9 are encapsulated by the pump 3 to the injection valve 2 either via the housing 3a, 3b, 4 and via the sliding sleeve 17 and via the bore 12 in the cylinder head 1, so that an exit from Medium is prevented from the outside.

Die Spann- bzw. Druckschrauben 8 und 15 spannen die Druckstücke 6 und 9 über plane Stirnflächen 25,26. Nach einer weiteren Ausführung können in der Stirnfläche der Schraube 8 und 15 auch Kugelelemente, was nicht näher gezeigt ist, angeordnet sein, die dann dem Druckstück 6 und 9 zugerichtet sind.The tensioning or pressure screws 8 and 15 tension the pressure pieces 6 and 9 over flat end faces 25, 26. According to a further embodiment, ball elements, which are not shown in more detail, can also be arranged in the end face of the screws 8 and 15, which are then directed towards the pressure pieces 6 and 9.

Der Anschluß des Querdruckstücks 6 an der Einspritzpumpe 3 kann, wie in Fig. 2 und 3 näher dargestellt ist, in verschiedenen Formen gewählt werden. Vorzugsweise wird auch hier eine ebene Hochdruckdichtung eingesetzt, es ist aber auch eine gehärtete Konusverbindung (Konus 16a) vorstellbar. Auch hier ist das Gehäuse 3a vorzugsweise als Rohrfeder gestaltet. Es kann jedoch auch die Druckschraube 15 elastische Eigenschaften zugeordnet bekommen.The connection of the transverse pressure piece 6 to the injection pump 3 can, as shown in FIGS. 2 and 3, be selected in various forms. A flat high-pressure seal is preferably also used here, but a hardened cone connection (cone 16a) is also conceivable. Here too, the housing 3a is preferably designed as a tubular spring. However, it can also get the pressure screw 15 assigned elastic properties.

Claims (12)

Brennkraftmaschine mit einem Einspritzsystem und einer getrennt gelagerten Einspritzpumpe, die über eine Kraftstoffleitung mit einem Einspritzventil im Zylinderkopf verbunden ist und diese Leitung mit dem Ventil und der Einspritzpumpe über ein Anschlußstück gehalten wird, dadurch gekennzeichnet, daß die Kraftstoffleitung zwei rechtwinklig zueinander angeordnete, aus geraden Druckstücken (6,9) bestehende Leitung (7,10) umfaßt, wobei das mit der Pumpe (3) verbundene Querdruckstück (6) im zusammentreffenden Eckbereich (11) über eine plane Dichtfläche (19), an das im Zylinderkopf (1) angeordnete Radialdruckstück (9) mittels einer korrespondierenden parallelen Dichtfläche (20) angeschlossen ist, welches in einem an den Zylinderkopf (1) angegossenem Aufnahmegehäuse (4) über eine Spannschraube (8) zusammengehalten und zur benachbarten Pumpe (3) über eine Schiebehülse (17) zwischen einem Pumpengehäuse (3a,3b) und dem Aufnahmegehäuse (4) herausgeführt ist und daß die beiden Gehäuse (4,3a,3b) als Rohrfedern ausgebildet sind und die Druckstücke (6,9) elastisch federnd halten.Internal combustion engine with an injection system and a separately mounted injection pump, which is connected via a fuel line to an injection valve in the cylinder head and this line is held with the valve and the injection pump via a connector, characterized in that the fuel line consists of two straight pressure pieces arranged at right angles to one another (6,9) existing line (7,10), the transverse pressure piece (6) connected to the pump (3) in the meeting corner area (11) via a flat sealing surface (19) to the radial pressure piece arranged in the cylinder head (1) (9) is connected by means of a corresponding parallel sealing surface (20) which is held together in a receptacle housing (4) cast onto the cylinder head (1) via a clamping screw (8) and to the adjacent pump (3) via a sliding sleeve (17) between one Pump housing (3a, 3b) and the receiving housing (4) is led out and that the two Housing (4,3a, 3b) are designed as tube springs and hold the pressure pieces (6,9) in an elastic, resilient manner. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß das am Zylinderkopf (1) angegossene Aufnahmegehäuse (4) sowie das weitere Aufnahmegehäuse (3a,3b) im Querschnitt rohrförmig ausgeführt ist und die Wandungen der Gehäuse (4,3 a,3b) definiert ausgebildete elastische Wandungen umfassen.Internal combustion engine according to claim 1, characterized in that the receptacle housing (4) cast on the cylinder head (1) and the further receptacle housing (3a, 3b) are tubular in cross-section and the walls of the housings (4,3a, 3b) are of elastic design Include walls. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die Schiebehülse (17) dicht verbunden mit den Aufnahmegehäusen (4,3a,3b) angeordnet ist und eine Verschalung für das Querdruckstück (6) bzw. das Radialdruckstück (9) bildet.Internal combustion engine according to claim 1, characterized in that the sliding sleeve (17) is arranged tightly connected to the receiving housings (4,3a, 3b) and forms a casing for the transverse pressure piece (6) or the radial pressure piece (9). Brennkraftmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die aus dem Radialdruckstück (9) und dem Querdruckstück (6) bestehenden Leitungen (7,10) von der Pumpe (3) bis zum Einspritzventil (2) kapselnd umschlossen im Zylinderkopf (1) über das Aufnahmegehäuse (4), die Schiebehülse (17) und durch das weitere pumpenseitige Aufnahmegehäuse (3a,3b) angeordnet sind.Internal combustion engine according to one of claims 1 to 3, characterized in that the lines (7, 10) consisting of the radial pressure piece (9) and the transverse pressure piece (6) from the pump (3) to the injection valve (2) are encapsulated in the cylinder head ( 1) over the receiving housing (4), the sliding sleeve (17) and through the further pump-side receiving housing (3a, 3b) are arranged. Brennkraftmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Spannschraube (8) im Eckbereich (11) der beiden Druckstücke (6,9) koaxial zum Radialdruckstück (9) angeordnet ist und zwischen der Schraube (8) und dem Radialdruckstück (9) das freie Ende (13b) des Querdruckstückes (6) eingespannt gehalten ist.Internal combustion engine according to one of Claims 1 to 4, characterized in that the clamping screw (8) is arranged in the corner region (11) of the two pressure pieces (6, 9) coaxially with the radial pressure piece (9) and between the screw (8) and the radial pressure piece ( 9) the free end (13b) of the transverse pressure piece (6) is held clamped. Brennkraftmaschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Druckschraube (15) am Gehäuse (3a,3b) der Einspritzpumpe (3) dem endseitigen Anschlußstück des Querdruckstückes (6) am freien Ende (13a) radial gegenübersteht und dieses freie Ende (13a) zwischen der Schraube (15) und einem Konus (16a) der Pumpe (3) eingespannt gehalten ist.Internal combustion engine according to one of claims 1 to 5, characterized in that the pressure screw (15) on the housing (3a, 3b) of the injection pump (3) is radially opposite the end connection piece of the transverse pressure piece (6) at the free end (13a) and this free end (13a) between the screw (15) and a cone (16a) of the pump (3) is held clamped. Brennkraftmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß zwischen der Druckschraube (15) bzw. der Spannschraube (8) und dem jeweiligen Anschlußstück am freien Ende (13a,13b) des Querdruckstückes (6) ein Kugelelement angeordnet ist, das aus einem verschleißfesten Material besteht.Internal combustion engine according to one of claims 1 to 6, characterized in that between the pressure screw (15) or the tensioning screw (8) and the respective connecting piece at the free end (13a, 13b) the transverse pressure piece (6) a ball element is arranged, which consists of a wear-resistant material. Brennkraftmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die planen Dichtflächen (19,20,21,22,23,24) im Verbindungsbereich der Druckstücke (6,9) untereinander sowie an der Pumpe (3) und am Einspritzventil (2) definiert elastoplastische Ringflächen aufweisen.Internal combustion engine according to one of claims 1 to 7, characterized in that the flat sealing surfaces (19, 20, 21, 22, 23, 24) in the connection area of the pressure pieces (6, 9) with one another and on the pump (3) and on the injection valve ( 2) have defined elastoplastic ring surfaces. Brennkraftmaschine nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Radialdruckstück (9) über im Abstand angeordnete erhabene Umfangsringe (18) in einer Bohrung (12) des Zylinderkopfes (1) zentriert gehalten ist.Internal combustion engine according to one of claims 1 to 8, characterized in that the radial pressure piece (9) is held centered in a bore (12) of the cylinder head (1) via raised circumferential rings (18) arranged at a distance. Brennkraftmaschine nach Anspruch 9, dadurch gekennzeichnet, daß wenigstens der dem Einspritzventil zugewandte Umfangsring (18) elastisch ausgeführt ist.Internal combustion engine according to claim 9, characterized in that at least the circumferential ring (18) facing the injection valve is designed to be elastic. Brennkraftmaschine nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Spann- und Druckschrauben (8,15) in axialer Richtung elastisch ausgebildet sind.Internal combustion engine according to one of Claims 1 to 10, characterized in that the tensioning and pressure screws (8, 15) are designed to be elastic in the axial direction. Brennkraftmaschine nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß zwischen den Schrauben (8,15) und den Druckstücken (6,9) Tellerfedern zur elastischen axialen Nachgiebigkeit angeordnet sind.Internal combustion engine according to one of claims 1 to 11, characterized in that disc springs are arranged between the screws (8, 15) and the pressure pieces (6, 9) for elastic axial compliance.
EP19910114136 1990-05-19 1991-08-23 Internal combustion engine with injection system Expired - Lifetime EP0533962B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904016190 DE4016190C2 (en) 1990-05-19 1990-05-19 Internal combustion engine with an injection system

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EP0533962A1 true EP0533962A1 (en) 1993-03-31
EP0533962B1 EP0533962B1 (en) 1994-04-06

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937444B2 (en) * 1969-07-23 1973-08-23 Mtu Friedrichshafen Gmbh FUEL LINE CONNECTIONS MADE THROUGH PLUG CONNECTIONS TO A PUMP NOZZLE UNIT FOR EACH CYLINDER OF A COMBUSTION MACHINE
DE3309854A1 (en) * 1982-04-19 1983-10-27 Yanmar Diesel Engine Co., Ltd., Osaka HOLDING DEVICE FOR THE FUEL INJECTION VALVE OF A DIESEL ENGINE
DE3821826A1 (en) * 1987-06-29 1989-01-26 Usui Kokusai Sangyo Kk ARRANGEMENT FOR CONNECTING A BRANCH IN A HIGH PRESSURE FUEL DISTRIBUTOR
DE4030486A1 (en) * 1989-09-27 1991-04-11 Usui Kokusai Sangyo Kk CONNECTION DESIGN FOR BRANCH CONNECTORS IN A HIGH PRESSURE FUEL RAIL

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845748A (en) * 1972-09-29 1974-11-05 Mack Trucks Fuel injection nozzle holder installation
DE3128523A1 (en) * 1981-07-18 1983-02-03 Motoren-Werke Mannheim AG vorm. Benz Abt. stationärer Motorenbau, 6800 Mannheim Cylinder head for an internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937444B2 (en) * 1969-07-23 1973-08-23 Mtu Friedrichshafen Gmbh FUEL LINE CONNECTIONS MADE THROUGH PLUG CONNECTIONS TO A PUMP NOZZLE UNIT FOR EACH CYLINDER OF A COMBUSTION MACHINE
DE3309854A1 (en) * 1982-04-19 1983-10-27 Yanmar Diesel Engine Co., Ltd., Osaka HOLDING DEVICE FOR THE FUEL INJECTION VALVE OF A DIESEL ENGINE
DE3821826A1 (en) * 1987-06-29 1989-01-26 Usui Kokusai Sangyo Kk ARRANGEMENT FOR CONNECTING A BRANCH IN A HIGH PRESSURE FUEL DISTRIBUTOR
DE4030486A1 (en) * 1989-09-27 1991-04-11 Usui Kokusai Sangyo Kk CONNECTION DESIGN FOR BRANCH CONNECTORS IN A HIGH PRESSURE FUEL RAIL

Also Published As

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EP0533962B1 (en) 1994-04-06
DE4016190A1 (en) 1991-11-21
DE4016190C2 (en) 1998-08-13
DK0533962T3 (en) 1994-08-22

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