EP0011611A1 - Fuel injection system for internal combustion engines - Google Patents

Fuel injection system for internal combustion engines Download PDF

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Publication number
EP0011611A1
EP0011611A1 EP79890048A EP79890048A EP0011611A1 EP 0011611 A1 EP0011611 A1 EP 0011611A1 EP 79890048 A EP79890048 A EP 79890048A EP 79890048 A EP79890048 A EP 79890048A EP 0011611 A1 EP0011611 A1 EP 0011611A1
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EP
European Patent Office
Prior art keywords
pump
fuel injection
injection system
housing
cylinder head
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
EP79890048A
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German (de)
French (fr)
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EP0011611B1 (en
Inventor
Heinz Rathmayr
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Friedmann and Maier AG
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Friedmann and Maier AG
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Publication date
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Publication of EP0011611A1 publication Critical patent/EP0011611A1/en
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Publication of EP0011611B1 publication Critical patent/EP0011611B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams

Definitions

  • the invention relates to a fuel injection system for injection internal combustion engines, in which a separate injection unit (pump-Dvse unit) is provided for each engine cylinder, each having an injection nozzle and a pump piston guided in a pump piston sleeve and driven by a camshaft, the axis of the pump camshaft the axis of the pump-nozzle unit intersects at least approximately, and the cam of the pump camshaft acts directly on a tappet engaging the pump piston.
  • a separate injection unit pump-Dvse unit
  • a pump camshaft serving to drive the pump-nozzle unit in the region of the end of the pump-nozzle unit facing away from the nozzle, the axis of the pump camshaft intersecting the axis of the pump-nozzle unit at least approximately, wherein the cam of the pump camshaft acts directly on a plunger engaging the pump piston.
  • the cam of the pump camshaft acts directly on a plunger engaging the pump piston.
  • the invention now aims to simplify the assembly and adjustment of the individual pump-nozzle units and to improve the accessibility of the pump-nozzle units in the event of rapid replacement in the case of defective pump-nozzle units.
  • the invention essentially consists in that the pump camshaft is mounted in a tunnel-like housing fixed on the engine cylinder, which is detachably connected to the engine cylinder head.
  • a housing has the advantage that the one hand Camshaft is secured against contamination and can be lubricated properly and that, on the other hand, noise insulation is achieved.
  • the detachable arrangement of this housing simplifies the casting of the cylinder head and, above all, enables simple assembly. With the tunnel-like housing removed, the pump-nozzle units can be inserted into the engine cylinder head and the camshaft with the housing can then be attached.
  • the tappet which is designed as a roller tappet or sliding tappet, can be guided in the housing of the pump-nozzle unit.
  • the plunger is connected to the housing of the pump-nozzle unit to form a single component which can be used as such.
  • the housing of the pump-nozzle unit is expediently supported in the region of the slide of the tappet in the cylinder head, a fastening element for fastening in the motor-cylinder head also being arranged in the region of the tappet guide on the housing of the pump-nozzle unit.
  • the guiding of the tappet which is designed as a roller or sliding tappet, can also be provided in that housing part in which the pump camshaft is mounted;
  • the plunger in the plunger guide is expediently secured against falling out by a stop element, for example by a resilient ring that tensions to the outside.
  • a fastening element for fastening it to the engine cylinder head is expediently arranged on the housing of the pump-nozzle unit outside the area of the tappet guide between the nozzle body and control intervention, so that the pump Nozzle unit is also secured to the engine cylinder head regardless of the housing part receiving the camshaft.
  • compensating elements for compensating the manufacturing tolerances can be provided between the tappet and the pump piston.
  • these compensating elements can be formed by interchangeable and stackable platelets or by fixable screws or screw nuts.
  • Fig. 1 shows a partial cross section through the cylinder head with the pump-nozzle element used perpendicular to the camshaft.
  • Fig. 2 shows another embodiment, also in cross section through the cylinder head,
  • Fig. 3 shows a side view of the engine with attached housing for the camshaft.
  • 1 represents the cylinder head, 2 the combustion chamber of the cylinder and 3 the pump-nozzle unit inserted in the cylinder head.
  • 4 is the housing of the pump-nozzle unit and 5 is the injection nozzle.
  • 30 is a machined collar on the housing 4, through which the housing 4 is supported laterally in a bore 31 in the cylinder head 1.
  • the housing 4 has claws 32 on both sides, through which screws 33 are passed, which are screwed into the cylinder head 1. These claws 32 and screws 33 form fastening elements for tightening the pump nozzle unit 3 in the cylinder head.
  • a tunnel-shaped housing 6 is placed on the cylinder head and is screwed to the cylinder head 1 by means of screws 7.
  • a camshaft 8 g e-bearings which is common to all pump-nozzle units, to which a number of engine cylinders are assigned.
  • the cams are designated 9.
  • a roll plunger 10 axially displaceably mounted, on which the cam 9 acts directly.
  • 11 is the drive wheel of the camshaft, which is driven by a toothed belt 12.
  • a space 13 which is separated from the cooling water space 34 by a wall 35.
  • 14 is a fuel line, from which lines 15 lead to each pump-nozzle unit.
  • 16 is the control rod of a unit injector.
  • levers 20 are fastened by means of screws 19, which act on the control rods 16 via connecting pieces 21, which are displaceably guided in the levers 20.
  • the embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that the roller tappet 22 is guided in the tunnel-shaped housing part 23 in which the camshaft is mounted.
  • the housing part 23 is equipped with a guide bore 24.
  • the housing part 23 is again clamped to the cylinder head 1 by means of screws 7.
  • 25 is the injection pump piston which protrudes from the housing 26 of the unit injector and 27 is the return spring.
  • 28 is an externally exciting spring ring which is inserted into a groove in the bore 24 and secures the roller tappet 22 from falling out when the housing part 23 is removed.
  • b is the distance of the bottom of the roller tappet from the center of the base circle of the cam and a is the distance of the piston 25 from the upper edge of the housing 26.
  • the dimension c is the thickness of the plate 29 and this thickness becomes chosen so that tolerance inaccuracies are compensated. If necessary, several such plates 29 can also be stacked one above the other in order to achieve the correct size.
  • the space 13 and the accessories arranged in this space are designed in the same way as in FIG. 1.
  • the only difference is that the fastening elements for fastening the housing 26 are arranged in the space 13 between the control rod 16 and the nozzle 5 on the housing 26.
  • These fastening elements which are not shown in FIG. 2, can be designed in an analogous manner to the claws 32 and the screws 33, only these claws being arranged between the control rod 16 and the nozzle 5 on the housing 26 and the screws into the wall 35 are screwed in.

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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

1. Fuel injection system for internal combustion engines providing a separate fuel injector (3) (pump-nozzle-unit) for each engine cylinder, said injector being equipped with an injection nozzle (5) and a pump plunger guided in a pump plunger sleeve and driven by pump cam shaft (8) with the axis of said pump cam shaft (8) crossing the axis of the pump-nozzle-unit (3) at least approximately and with the cam (9) of the pump cam shaft (8) acting directly onto a tappet (10, 22) abutting cam shaft (8) being arranged within a tubular housing which is positioned on the engine cylinder head (1) and secured to it in a detachable connection, characterized in that the pump can shaft (8) is journalled in the tubular housing (6, 23) positioned on the engine cylinder head (1).

Description

Die Erfindung bezieht sich auf eine Brennstoffeinspritzanlage für Einspritzbrennkraftmaschinen, bei welchen für jeden Motorzylinder eine gesonderte Einspritzeinheit (Pumpe-Dvse-Einheit) vorgesehen ist, welche je eine Einspritzdüse und einen in einer Pumpenkolbenbüchse geführten von einer Nockenwelle angetriebenen Pumpenkolben aufweist, wobei die Achse der Pumpennockenwelle die Achse der Pumpe-Düse-Einheit zumindest angenähert schneidet, und die Nocke der Pumpennockenwelle unmittelbar auf einen an dem Pumpenkolben angreifenden Stößel einwirkt. Solche Brennstoffeinspritzanlagen haben bei Mehrzylindermotoren gegenüber mehrstelligen Einspritzpumpen den Vorteil, daß Einspritzdruckleitungen wegfallen und daher das Einspritzgesetz nicht durch die elastische Aufweitbarkeit der Leitungen verzerrt wird. Der Nachteil solcher Brennstoffeinspritzanlagen, bei welchen eine Pumpe-Düse-Einheit im Zylinder unmittelbar eingesetzt ist, besteht in der Aufwendigkeit des Antriebes. Der Antrieb solcher Pumpe-Düse-Einheiten wird üblicherweise von auf der Motornockenwelle sitzenden Nocken abgeleitet, wobei der Antrieb vom Nocken über einen Stößel, eine Stoßstange und einen Kipphebel auf die Pumpe-Düse-Einheit erfolgt. Abgesehen davon, daß eine solche Antriebsanordnung kompliziert ist, wird auch wieder hier durch die Elastizität der einzelnen Teile des Antriebes das Einspritzgesetz verzerrt, und um einen möglichst starren Antrieb zu erreichen, müssen die Teile des Antriebes stark ausgebildet werden, wodurch wieder große Massenkräfte entstehen. Diese Massenkräfte müssen durch die Rückholfeder in der Pumpe-Düse-Einheit überwunden werden und es ist daher auch eine verhältnismäßig starke Ausbildung der Pumpe-Düse-Einheit erforderlich. Diese Nachteile lassen sich durch eine für den Antrieb der Pumpe-Düse-Einheit dienende Pumpennockenwelle im Bereich des von der Düse abgewendete Endes der Pumpe-Düse-Einheit beseitigen, wobei die Achse der Pumpennockenwelle die Achse der Pumpe-Düse-Einheit zumindest angenähert schneidet, wobei die Nocke der Pumpennockenwelle unmittelbar auf einen an dem Pumpenkolben angreifenden Stößel einwirkt. Auf diese Weise werden Kraftübertragungsteile eingespart und es wird das Gewicht der hin- und hergehenden Massen auf ein Minimum, nämlich auf das Gewicht des Stößels und des Pumpenkolbens reduziert. Es wird eine präzisere Einhaltung des Einspritzgesetzes ermöglicht. Die Rückholfeder der Pumpe-Düse-Einheit kann verhältnismäßig schwach bemessen sein, so daß sich auch kleine Baumaße für die Pumpe-Düse-Einheit ergeben. Bei in Reihe angeordneten Motorzylindern ist es vorteilhaft, eine gemeinsame Nockenwelle für alle Pumpe-Düse-Einheiten einer Motorzylinderreiche vorzusehen, deren Achse die Achsen aller dieser Pumpe-Düse-Einheiten zumindest angenähert schneidet. Bei den bekannten Ausführungen wurde jedoch dem Umstand in keiner Weise Rechnung getragen, daß bei einem Schadhaftwerden einzelner Pumpe-Düse-Einheiten ein einfacher Austausch solcher schadhafter Einheiten möglich sein soll.The invention relates to a fuel injection system for injection internal combustion engines, in which a separate injection unit (pump-Dvse unit) is provided for each engine cylinder, each having an injection nozzle and a pump piston guided in a pump piston sleeve and driven by a camshaft, the axis of the pump camshaft the axis of the pump-nozzle unit intersects at least approximately, and the cam of the pump camshaft acts directly on a tappet engaging the pump piston. Such fuel injection systems have the advantage in multi-cylinder engines compared to multi-digit injection pumps that injection pressure lines are omitted and therefore the injection law is not distorted by the elastic expandability of the lines. The disadvantage of such fuel injection systems, in which a pump-nozzle unit is used directly in the cylinder, is the complexity of the drive. The drive of such pump-nozzle units is usually derived from cams sitting on the engine camshaft, the drive from the cam being effected via a tappet, a bumper and a rocker arm on the pump-nozzle unit. Apart from the fact that such a drive arrangement is complicated, the injection law is distorted again by the elasticity of the individual parts of the drive, and in order to achieve a drive that is as rigid as possible, the parts of the drive must be strongly trained, which again creates large inertial forces. These inertia forces have to go through the return spring in the pump nozzle. Unit are overcome and therefore a relatively strong training of the pump-nozzle unit is required. These disadvantages can be eliminated by a pump camshaft serving to drive the pump-nozzle unit in the region of the end of the pump-nozzle unit facing away from the nozzle, the axis of the pump camshaft intersecting the axis of the pump-nozzle unit at least approximately, wherein the cam of the pump camshaft acts directly on a plunger engaging the pump piston. In this way, power transmission parts are saved and the weight of the reciprocating masses is reduced to a minimum, namely the weight of the tappet and the pump piston. A more precise compliance with the injection law is made possible. The return spring of the pump-nozzle unit can be relatively weak, so that there are also small dimensions for the pump-nozzle unit. In the case of engine cylinders arranged in series, it is advantageous to provide a common camshaft for all pump-injector units of an engine cylinder range, the axis of which intersects the axes of all these pump-injector units at least approximately. In the known designs, however, no account has been taken of the fact that a simple replacement of such defective units should be possible if individual pump-nozzle units become defective.

Die Erfindung zielt nun darauf ab, die Montage und die Justierung der einzelnen Pumpe-Düse-Einheiten zu vereinfachen und die Zugänglichkeit der Pumpe-Düse-Einheiten für den Fall eines raschen Austausches bei schadhaften Pumpe-Düse-Einheiten zu verbessern. eThe invention now aims to simplify the assembly and adjustment of the individual pump-nozzle units and to improve the accessibility of the pump-nozzle units in the event of rapid replacement in the case of defective pump-nozzle units. e

Zur Lösung dieser Aufgabe besteht die Erfindung im wesentlichen darin, daß die Pumpennockenwelle in einem auf dem Motorzylinder festgelegten tunnelartiaen Gehäuse gelagert ist, welches mit dem Motorzylinderkopf lösbar verbunden ist. Ein solches Gehäuse hat den Vorteil, daß einerseits die Nockenwelle vor Verschmutzung gesichert ist und einwandfrei geschmiert werden kann und daß andererseits dadurch auch eine Geräuschdämmung erreicht wird. Die lösbare Anordnung dieses Gehäuses ergibt eine Vereinfachung der Gußform des Zylinderkopfes und ermöglicht vor allem eine einfache Montage. Die Pumpe-Düse-Einheiten können bei abgenommenem tunnelartigem Gehäuse in den Motorzylinderkopf eingesetzt werden und es kann dann die Nockenwelle mit dem Gehäuse aufgesetzt werden.To achieve this object, the invention essentially consists in that the pump camshaft is mounted in a tunnel-like housing fixed on the engine cylinder, which is detachably connected to the engine cylinder head. Such a housing has the advantage that the one hand Camshaft is secured against contamination and can be lubricated properly and that, on the other hand, noise insulation is achieved. The detachable arrangement of this housing simplifies the casting of the cylinder head and, above all, enables simple assembly. With the tunnel-like housing removed, the pump-nozzle units can be inserted into the engine cylinder head and the camshaft with the housing can then be attached.

Gemäß der Erfindung kann der als Rollen- oder Gleitstößel ausgebildete Stößel im Gehäuse der Pumpe-Düse-Einheit geführt sein. Dies hat den Vorteil, daß der Stößel mit dem Gehäuse der Pumpe-Düse-Einheit zu einem einzigen Bauteil verbunden ist, welcher als solcher eingesetzt werden kann. In diesem Fall ist zweckmäßig das Gehäuse der Pumpe-Düse-Einheit im Bereich der Gleitbahn des Stößels im Zylinderkopf abgestützt, wobei auch am Gehäuse der Pumpe-Düse-Einheit ein Befestigungselement zur Befestigung im Motorzylinderkopf im Bereich der Stößelführung angeordnet ist.According to the invention, the tappet, which is designed as a roller tappet or sliding tappet, can be guided in the housing of the pump-nozzle unit. This has the advantage that the plunger is connected to the housing of the pump-nozzle unit to form a single component which can be used as such. In this case, the housing of the pump-nozzle unit is expediently supported in the region of the slide of the tappet in the cylinder head, a fastening element for fastening in the motor-cylinder head also being arranged in the region of the tappet guide on the housing of the pump-nozzle unit.

Gemäß der Erfindung kann aber auch die Führung des als Rollen- oder Gleitstößel ausgebildeten Stößels in jenem Gehäuseteil vorgesehen sein, in welchem die Pumpennockenwelle gelagert ist; dies hat wieder den Vorteil, daß der im Gehäuse der Nockenwelle sitzende Stößel den die Nockenwelle aufnehmenden Hohlraum abdichtet, so daß nun bei Montagearbeiten, wenn dieses Gehäuse abgenommen ist, der die Nockenwelle aufnehmende Hohlraum geschlossen und gegen das Eindringen von Verunreinigungen und Fremdkörpern gesichert ist. Hiebei ist zweckmäßig der Stößel in der Stößelführung durch ein Anschlagelement, beispielsweise durch einen nach außen spannenden federnden Ring, gegen Herausfallen gesichert. In diesem Fall ist zweckmäßig am Gehäuse der Pumpe-Düse-Einheit ein Befestigungselement zur Befestigung desselben am Motorzylinderkopf außerhalb des Bereiches der Stößelführung zwischen Düsenkörper und Regelungseingriff angeordnet, so daß die Pumpe-Düse-Einheit auch unabhängig von dem die Nockenwelle aufnehmenden Gehäuseteil am Motorzylinderkopf gesichert ist.According to the invention, however, the guiding of the tappet, which is designed as a roller or sliding tappet, can also be provided in that housing part in which the pump camshaft is mounted; This again has the advantage that the plunger seated in the camshaft housing seals the cavity receiving the camshaft, so that now during assembly work, when this housing has been removed, the camshaft receiving cavity is closed and secured against the ingress of contaminants and foreign bodies. The plunger in the plunger guide is expediently secured against falling out by a stop element, for example by a resilient ring that tensions to the outside. In this case, a fastening element for fastening it to the engine cylinder head is expediently arranged on the housing of the pump-nozzle unit outside the area of the tappet guide between the nozzle body and control intervention, so that the pump Nozzle unit is also secured to the engine cylinder head regardless of the housing part receiving the camshaft.

In allen Fällen können gemäß der Erfindung zwischen Stößel und Pumpenkolben Ausgleichselemente für den Ausgleich der Fertigungstoleranzen vorgesehen sein. Diese Ausgleichselemente können gemäß der Erfindung von auswechselbaren und stapelbaren Plättchen gebildet oder von fixierbaren Schrauben oder Schraubenmuttern gebildet sein.In all cases, according to the invention, compensating elements for compensating the manufacturing tolerances can be provided between the tappet and the pump piston. According to the invention, these compensating elements can be formed by interchangeable and stackable platelets or by fixable screws or screw nuts.

In der Zeichnung ist die Erfindung an Hand von Ausführungsbeispielen schematisch veranschaulicht. Fig. 1 zeigt einen Teilquerschnitt durch den Zylinderkopf mit dem eingesetzten Pumpe-Düse-Element senkrecht zur Nockenwelle. Fig. 2 zeigt eine andere Ausführungsform, gleichfalls im Querschnitt durch den Zylinderkopf, Fig. 3 zeigt eine Seitenansicht des Motors mit aufgesetztem Gehäuse für die Nockenwelle.In the drawing, the invention is illustrated schematically using exemplary embodiments. Fig. 1 shows a partial cross section through the cylinder head with the pump-nozzle element used perpendicular to the camshaft. Fig. 2 shows another embodiment, also in cross section through the cylinder head, Fig. 3 shows a side view of the engine with attached housing for the camshaft.

Bei der Anordnung nach Fig. 1 stellt 1 den Zylinderkopf, 2 den Brennraum des Zylinders und 3 die in den Zylinderkopf eingesetzte Pumpe-Düse-Einheit dar. 4 ist das Gehäuse der Pumpe-Düse-Einheit und 5 ist die Einspritzdüse. 30 ist ein bearbeiteter Bund am Gehäuse 4, durch welchen das Gehäuse 4 in einer Bohrung 31 im Zylinderkopf 1 seitlich abgestützt ist. Das Gehäuse 4 weist beidseitig Pratzen 32 auf, durch welche Schrauben 33 hindurchgeführt sind, welche in den Zylinderkopf 1 eingeschraubt werden. Diese Pratzen 32 und Schrauben 33 bilden Befestigungselemente für das Festspannen der Pumpe-Düse-Einheit 3 im Zylinderkopf.In the arrangement according to FIG. 1, 1 represents the cylinder head, 2 the combustion chamber of the cylinder and 3 the pump-nozzle unit inserted in the cylinder head. 4 is the housing of the pump-nozzle unit and 5 is the injection nozzle. 30 is a machined collar on the housing 4, through which the housing 4 is supported laterally in a bore 31 in the cylinder head 1. The housing 4 has claws 32 on both sides, through which screws 33 are passed, which are screwed into the cylinder head 1. These claws 32 and screws 33 form fastening elements for tightening the pump nozzle unit 3 in the cylinder head.

Auf den Zylinderkopf ist ein tunnelförmiges Gehäuse 6 aufgesetzt, welches mittels Schrauben 7 mit dem Zylinderkopf 1 verschraubt ist. In diesem Gehäuse 6 ist eine Nockenwelle 8 ge-lagert, welche für alle Pumpe-Düse-Einheiten, welchen eine Reihe von Motorzylindern zugeordnet sind, gemeinsam ist. Die Nocken sind mit 9 bezeichnet. Im Gehäuse 4 ist ein Rollenstößel 10 axial verschiebbar gelagert, auf den der Nocken 9 unmittelbar einwirkt. 11 ist das Antriebsrad der Nockenwelle, welches durch einen Zahnriemen 12 angetrieben wird.A tunnel-shaped housing 6 is placed on the cylinder head and is screwed to the cylinder head 1 by means of screws 7. In this housing 6 is a camshaft 8 g e-bearings, which is common to all pump-nozzle units, to which a number of engine cylinders are assigned. The cams are designated 9. In the housing 4 is a roll plunger 10 axially displaceably mounted, on which the cam 9 acts directly. 11 is the drive wheel of the camshaft, which is driven by a toothed belt 12.

Innerhalb eines Raumes 13, welcher vom Kühlwasserraum 34 durch eine Wandung 35 getrennt ist, sind Zusatzeinrichtungen untergebracht. 14 ist eine Brennstoffleitung, von welcher aus Leitungen 15 zu jeder Pumpe-Düse-Einheit geführt sind. 16 ist die Regelstange einer Pumpe-Düse-Einheit. An einer Welle 17, welche vom Drehzahlregler, der in Fig. 3 mit 18 bezeichnet ist, verdreht wird, sind mittels Schrauben 19 Hebel 20 befestigt, welche über Verbindungsstücke 21, die verschiebbar in den Hebeln 20 geführt sind, an den Regelstangen 16 angreifen.Additional devices are accommodated in a space 13, which is separated from the cooling water space 34 by a wall 35. 14 is a fuel line, from which lines 15 lead to each pump-nozzle unit. 16 is the control rod of a unit injector. On a shaft 17, which is rotated by the speed controller, which is denoted by 18 in FIG. 3, levers 20 are fastened by means of screws 19, which act on the control rods 16 via connecting pieces 21, which are displaceably guided in the levers 20.

Die Ausführungsform nach Fig. 2 unterscheidet sich von der Ausführungsform nach Fig. 1 dadurch, daß der Rollenstößel 22 in dem tunnelförmigen Gehäuseteil 23 geführt ist, in welchem die Nockenwelle gelagert ist. Zu diesem Zweck ist der Gehäuseteil 23 mit einer Führungsbohrung 24 ausgestattet. Der Gehäuseteil 23 ist wieder mittels Schrauben 7 am Zylinderkopf 1 festgespannt.The embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that the roller tappet 22 is guided in the tunnel-shaped housing part 23 in which the camshaft is mounted. For this purpose, the housing part 23 is equipped with a guide bore 24. The housing part 23 is again clamped to the cylinder head 1 by means of screws 7.

25 ist der Einspritzpumpenkolben, welcher aus dem Gehäuse 26 der Pumpe-Düse-Einheit herausragt und 27 ist die Rückholfeder. 28 ist ein nach außen spannender Federring, der in eine Nut der Bohrung 24 eingesetzt ist und den Rollenstößel 22 vor dem Herausfallen sichert, wenn der Gehäuseteil 23 abgenommen wird.25 is the injection pump piston which protrudes from the housing 26 of the unit injector and 27 is the return spring. 28 is an externally exciting spring ring which is inserted into a groove in the bore 24 and secures the roller tappet 22 from falling out when the housing part 23 is removed.

29 ist ein Plättchen, welches zwischen dem Kolben 25 und dem Stößel 22 eingesetzt ist, um Toleranzungenauigkeiten zu korrigieren. b ist der Abstand des Bodens des Rollenstößels vom Zentrum des Grundkreises des Nockens und a ist der Abstand des Kolbens 25 von der Oberkante des Gehäuses 26. Das Maß c ist die-Stärke des Plättchens 29 und diese Stärke wird so gewählt, daß Toleranzungenauigkeiten ausgeglichen werden. Gegebenenfalls können auch mehrere solche Plättchen 29 übereinander gestapelt sein, um das richtige Maß zu erreichen.29 is a plate which is inserted between the piston 25 and the plunger 22 in order to correct tolerance inaccuracies. b is the distance of the bottom of the roller tappet from the center of the base circle of the cam and a is the distance of the piston 25 from the upper edge of the housing 26. The dimension c is the thickness of the plate 29 and this thickness becomes chosen so that tolerance inaccuracies are compensated. If necessary, several such plates 29 can also be stacked one above the other in order to achieve the correct size.

Der Raum 13 und die in diesem Raum angeordneten Zubehörteile sind ebenso ausgebildet wie in Fig. l. Es besteht lediglich der Unterschied, daß die Befestigungselemente für die Befestigung des Gehäuses 26 im Raum 13 zwischen der Regelstange 16 und der Düse 5 am Gehäuse 26 angeordnet sind. Diese Befestigungselemente, welche in Fig. 2 nicht dargestellt sind, können in analoger Weise wie die Pratzen 32 und die Schrauben 33 ausgebildet sein, wobei lediglich diese Pratzen zwischen der Regelstange 16 und der Düse 5 am Gehäuse 26 angeordnet sind und die Schrauben in die Wandung 35 eingeschraubt sind.The space 13 and the accessories arranged in this space are designed in the same way as in FIG. 1. The only difference is that the fastening elements for fastening the housing 26 are arranged in the space 13 between the control rod 16 and the nozzle 5 on the housing 26. These fastening elements, which are not shown in FIG. 2, can be designed in an analogous manner to the claws 32 and the screws 33, only these claws being arranged between the control rod 16 and the nozzle 5 on the housing 26 and the screws into the wall 35 are screwed in.

Claims (10)

1. Brennstoffeinspritzanlage für Einspritzbrennkraftmaschinen, bei welchen für jeden Motorzylinder eine gesonderte Einspritzeinheit (Pumpe-Düse-Einheit) vorgesehen ist, welche je eine Einspritzdüse und einen in einer Pumpenkolbenbüchse geführten von einer Nockenwelle angetriebenen Pumpenkolben aufweist, wobei die Achse der Pumpennockenwelle die Achse der Pumpe-Düse-Einheit zumindest angenähert schneidet, und die Nocke der Pumpennockenwelle unmittelbar auf einen an dem Pumpenkolben angreifenden Stößel einwirkt, dadurch gekennzeichnet, daß die Pumpennockenwelle (8) in einem auf dem Motorzylinderkopf festgelegten tunnelartigen Gehäuse (6, 23) gelagert ist, welches mit dem Motorzylinderkopf (7) lösbar verbunden ist.1.Fuel injection system for injection internal combustion engines, in which a separate injection unit (pump-nozzle unit) is provided for each engine cylinder, each having an injection nozzle and a pump piston guided in a pump piston sleeve and driven by a camshaft, the axis of the pump camshaft being the axis of the pump -Nozzle unit cuts at least approximately, and the cam of the pump camshaft acts directly on a plunger engaging the pump piston, characterized in that the pump camshaft (8) is mounted in a tunnel-like housing (6, 23) fixed on the motor cylinder head, which with the engine cylinder head (7) is detachably connected. 2. Brennstoffeinspritzanlage nach Anspruch 1, dadurch gekennzeichnet, daß der als Rollen- oder Gleitstößel ausgebildete Stößel (10) im Gehäuse (4) der Pumpe-Düse-Einheit geführt ist.2. Fuel injection system according to claim 1, characterized in that the plunger (10) designed as a roller or sliding plunger is guided in the housing (4) of the pump-nozzle unit. 3. Brennstoffeinspritzanlage nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Gehäuse (4) der Pumpe-Düse-Einheit (3) im Bereich der Gleitbahn des Stößels im Zylinderkopf (1) abgestützt ist.3. Fuel injection system according to one of claims 1 or 2, characterized in that the housing (4) of the pump-nozzle unit (3) is supported in the region of the slide path of the tappet in the cylinder head (1). 4. Brennstoffeinspritzanlage nach einem der Ansprüche 1, 2 oder 3, dadurch gekennzeichnet, daß am Gehäuse (4) der Pumpe-Düse-Einheit (3) ein Befestigungselement (32, 33) zur Befestigung im Motorzylinderkopf (1) im Bereich der Stößelführung angeordnet ist.4. Fuel injection system according to one of claims 1, 2 or 3, characterized in that on the housing (4) of the pump-nozzle unit (3) a fastening element (32, 33) for fastening in the engine cylinder head (1) in the region of the tappet guide is. 5. Brennstoffeinspritzanlage nach Anspruch 1, dadurch gekennzeichnet, daß die Führung des als Rollen- oder Gleitstößel ausgebildeten Stößels (22) in jenem Gehäuseteil (23) vorgesehen ist, in welchem die Pumpennockenwelle (8) gelagert ist.5. Fuel injection system according to claim 1, characterized in that the guide of the plunger designed as a roller or sliding plunger (22) is provided in that housing part (23) in which the pump camshaft (8) is mounted. 6. Brennstoffeinspritzanlage nach Anspruch 5, dadurch gekennzeichnet, daß der Stößel (22) in der Stößelführung (24) durch ein Anschlagelement, beispielsweise durch einen nach außen spannenden federnden Ring (28), gegen Herausfallen gesichert ist.6. Fuel injection system according to claim 5, characterized in that the plunger (22) in the plunger guide (24) is secured against falling out by a stop element, for example by an outwardly exciting resilient ring (28). 7. Brennstoffeinspritzanlage nach Anspruch 6, dadurch gekennzeichnet, daß am Gehäuse (4) der Pumpe-Düse-Einheit (3) ein Befestigungselement zur Befestigung derselben im Motorzylinderkopf außerhalb des Bereiches der Stößelführung zwischen Düsenkörper und Regelungseingriff angeordnet ist.7. Fuel injection system according to claim 6, characterized in that on the housing (4) of the pump-nozzle unit (3) a fastening element for fastening the same is arranged in the engine cylinder head outside the area of the tappet guide between the nozzle body and control intervention. 8. Brennstoffeinspritzanlage nach einem der Ansprüche 1 bis 7, durch gekennzeichnet, daß zwischen Stößel (22) und Pumpenkolben (25) Ausgleichselemente (29) für den Ausgleich der Fertigungstoleranzen vorgesehen sind.8. Fuel injection system according to one of claims 1 to 7, characterized in that compensating elements (29) are provided between the tappet (22) and pump piston (25) for compensating for the manufacturing tolerances. 9. Brennstoffeinspritzanlage nach Anspruch 8, dadurch gekennzeichnet, daß die Ausgleichselemente von auswechselbaren und stapelbaren Plättchen (29) gebildet sind.9. Fuel injection system according to claim 8, characterized in that the compensating elements are formed by interchangeable and stackable plates (29). 10. Brennstoffeinspritzanlage nach Anspruch 8, dadurch gekennzeichnet, daß die Ausgleichselemente fixierbare Schrauben oder Schraubenmuttern sind. 1979 10 24 sm10. Fuel injection system according to claim 8, characterized in that the compensating elements are fixable screws or nuts. 1979 10 24 nm
EP19790890048 1978-11-10 1979-11-09 Fuel injection system for internal combustion engines Expired EP0011611B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT806678A AT364199B (en) 1978-11-10 1978-11-10 FUEL INJECTION SYSTEM FOR INJECTION COMBUSTION ENGINES
AT8066/78 1978-11-10

Publications (2)

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EP0011611A1 true EP0011611A1 (en) 1980-05-28
EP0011611B1 EP0011611B1 (en) 1982-05-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790890048 Expired EP0011611B1 (en) 1978-11-10 1979-11-09 Fuel injection system for internal combustion engines

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EP (1) EP0011611B1 (en)
AT (1) AT364199B (en)
DE (1) DE2962840D1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0866215A1 (en) * 1997-03-18 1998-09-23 Cummins Engine Company, Inc. Overhead cam shaft for unit injectors and internal combustion engine therewith
WO2000040853A1 (en) * 1999-01-08 2000-07-13 Volkswagen Aktiengesellschaft Actuators for pump-nozzle-injection elements or injection pumps for internal combustion engines
CN114198229A (en) * 2021-12-13 2022-03-18 重庆红江机械有限责任公司 Large-scale high-pressure oil pump cam box subassembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3149033A1 (en) * 1981-12-11 1983-06-16 L'Orange GmbH, 7000 Stuttgart Injection system for internal combustion engines
AT401408B (en) * 1988-12-15 1996-09-25 Avl Verbrennungskraft Messtech PISTON PISTON ENGINE

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676061A (en) * 1951-04-24 1954-04-20 Fred J Arisman Fuel injector for internalcombustion engines
GB714610A (en) * 1950-12-08 1954-09-01 Daimler Benz Ag Improvements relating to fuel-injection arrangements for internal combustion engines
GB1040017A (en) * 1962-06-28 1966-08-24 Bendix Corp Fuel injector
DE2719228A1 (en) * 1976-04-30 1977-11-17 Scient Energy Syst INJECTION DEVICE FOR AN INTERNAL COMBUSTION MACHINE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB714610A (en) * 1950-12-08 1954-09-01 Daimler Benz Ag Improvements relating to fuel-injection arrangements for internal combustion engines
US2676061A (en) * 1951-04-24 1954-04-20 Fred J Arisman Fuel injector for internalcombustion engines
GB1040017A (en) * 1962-06-28 1966-08-24 Bendix Corp Fuel injector
DE2719228A1 (en) * 1976-04-30 1977-11-17 Scient Energy Syst INJECTION DEVICE FOR AN INTERNAL COMBUSTION MACHINE

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0866215A1 (en) * 1997-03-18 1998-09-23 Cummins Engine Company, Inc. Overhead cam shaft for unit injectors and internal combustion engine therewith
US5975060A (en) * 1997-03-18 1999-11-02 Cummins Engine Company, Inc. Dedicated overhead cam shaft for unit injector
WO2000040853A1 (en) * 1999-01-08 2000-07-13 Volkswagen Aktiengesellschaft Actuators for pump-nozzle-injection elements or injection pumps for internal combustion engines
US6427669B1 (en) 1999-01-08 2002-08-06 Volkswagen Aktiengesellschaft Actuators for pump-nozzle-injection elements or injection pumps for internal combustion engines
CN114198229A (en) * 2021-12-13 2022-03-18 重庆红江机械有限责任公司 Large-scale high-pressure oil pump cam box subassembly
CN114198229B (en) * 2021-12-13 2024-04-26 重庆红江机械有限责任公司 Cam box assembly of large high-pressure oil pump

Also Published As

Publication number Publication date
DE2962840D1 (en) 1982-07-01
EP0011611B1 (en) 1982-05-12
ATA806678A (en) 1981-02-15
AT364199B (en) 1981-09-25

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