EP0369151A1 - Monobloc injection pump and nozzle and fastening device - Google Patents

Monobloc injection pump and nozzle and fastening device Download PDF

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Publication number
EP0369151A1
EP0369151A1 EP89118437A EP89118437A EP0369151A1 EP 0369151 A1 EP0369151 A1 EP 0369151A1 EP 89118437 A EP89118437 A EP 89118437A EP 89118437 A EP89118437 A EP 89118437A EP 0369151 A1 EP0369151 A1 EP 0369151A1
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EP
European Patent Office
Prior art keywords
pump
housing
nozzle
head
fastening 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
Application number
EP89118437A
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German (de)
French (fr)
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EP0369151B1 (en
Inventor
Heinz Rathmayr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ROBERT BOSCH AG
Original Assignee
Robert Bosch AG
Voestalpine Metal Forming GmbH
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Robert Bosch AG, Voestalpine Metal Forming GmbH filed Critical Robert Bosch AG
Priority to AT89118437T priority Critical patent/ATE87995T1/en
Publication of EP0369151A1 publication Critical patent/EP0369151A1/en
Application granted granted Critical
Publication of EP0369151B1 publication Critical patent/EP0369151B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to pump nozzles for multi-cylinder internal combustion engines, in which an injection pump element and an injection nozzle element are combined by a pump housing, which is clamped down in a stepped bore in the cylinder head, and by a fastening device which brings about this low clamping.
  • the invention relates to high-pressure injection nozzles with electrically or hydraulically actuated actuators for quantity and / or spray adjustment, which are enclosed in a pressure-tight manner by a head housing and their fastening.
  • the position of the holes in the flange for each engine type must be specifically determined according to the specific circumstances, which means that a large number of different designs of a pump nozzle must be kept in stock and many holes must be machined in the cylinder head, which weaken them structurally.
  • the end parts of the clamping bracket are spherical, differences in height between the projections of the pump nozzles can be compensated for.
  • FIG. 1 shows a longitudinal section through the cylinder head wall
  • FIG. 2 shows a greatly simplified plan view of FIG. 1
  • FIG. 3 shows an arrangement of the same component parts with a larger cylinder spacing.
  • a pump nozzle (2) in section and a pump nozzle (3) are shown in view in a cylinder head wall (1). Both are driven by a camshaft, not shown, via thrust pieces (4) from the engine.
  • the pump nozzles (2, 3) are surrounded by a pump housing (5) which is inserted in a stepped bore (6) in the cylinder head wall (1). Seals and fuel supply and discharge to and from the pump nozzle are not shown for the sake of simplicity.
  • the pump housing (5) contains a pump piston sleeve (7) in which a piston (8) works.
  • the pump housing (5) is sealed off at the top by a head housing (13) which contains an electromagnetic drive (14) for the actuator (15), which here, for example, causes the pump piston (8) to rotate.
  • the inside of the pump housing (5) and head housing (13) is completely filled with fuel.
  • the working movement of the guide sleeve (9) prevails in the annular space (10) a pulsating pressure that can reach 25 bar. This propagates through the electromagnetic drive (14) into the head space (12). This creates a pulsating force there that tries to lift the head housing (13) from the pump housing (5).
  • the head housing (13) has projections (20) on opposite sides with horizontal engagement surfaces (21) for clamping brackets (22).
  • the clamping bracket (22) have spherical end parts (23) which rest on the contact surfaces (21).
  • a expansion screw (24) engages via a spherical washer (26), which ensures that the pump nozzle (2, 3) is clamped down on the cylinder head wall (1).
  • Fig. 2 it can be seen that the clamping bracket (22) are inclined at an angle (25) relative to the direction of the motor axis (27). Where the clamping brackets (22) engage on the attack surface (21) is not critical. This makes it possible to use identical pump nozzles (2, 3) and clamping brackets (22) according to FIG. 3 even with a larger cylinder spacing (28), a different angle (25) resulting which can also be 0 °. With even larger cylinder distances, longer clamping brackets (22) can of course also be used.

Abstract

In order to fasten a monobloc injection pump (2) comprising a pump housing (5) and a head housing (13) on a stepped bore (6) of the cylinder head (1) in such a way that leakage points, which can arise between the pump housing (5) and the head housing (13) when the monobloc injection pump (2) is clamped down, are avoided, it is proposed that the head housing (13) have projections (20) on two opposite sides, on which clamp clips (22) pulled downwards by a clamp bolt (24) rest, the end parts (23) of the clamp clips (22) resting on the projections (20) of two adjacent monobloc injection pumps (2, 3) in each case. <IMAGE>

Description

Die Erfindung handelt von Pumpedüsen für mehrzylin­drige Brennkraftmaschinen, bei denen ein Einspritz­pumpenelement und ein Einspritzdüsenelement von einem Pumpengehäuse zusammengefaßt werden, das in einer abgestuften Bohrung des Zylinderkopfes niedergespannt wird und von einer Befestigungsvorrichtung, die dieses Niederspannen bewirkt. Insbesondere handelt die Er­findung von Hochdruckeinspritzdüsen mit elektrisch oder hydraulisch betätigten Stellgliedern für Mengen- und/oder Spritzverstellung, die von einem Kopfgehäuse druckdicht umschlossen werden und deren Befestigung.The invention relates to pump nozzles for multi-cylinder internal combustion engines, in which an injection pump element and an injection nozzle element are combined by a pump housing, which is clamped down in a stepped bore in the cylinder head, and by a fastening device which brings about this low clamping. In particular, the invention relates to high-pressure injection nozzles with electrically or hydraulically actuated actuators for quantity and / or spray adjustment, which are enclosed in a pressure-tight manner by a head housing and their fastening.

Aus der AT-PS 372 502 ist es bekannt, das Gehäuse mit einem Flansch oder an gegenüberliegenden Seiten angebrachten Ohren zu versehen, die mittels Schrauben auf den Zylinderkopf niedergespannt werden.From AT-PS 372 502 it is known to provide the housing with a flange or ears attached on opposite sides, which are clamped onto the cylinder head by means of screws.

Diese Befestigungsart ist nachteilig, weil die in geringem Abstand von der Pumpedüsen-Längsachse am Pumpengehäuse angreifenden kurzen Zugschrauben eine starre Verbindung darstellen, die elastische Dehnungen nicht zuläßt. Dadurch, daß auf die Pumpedüse die pulsierenden Gaskräfte im Brennraum und die Erschütte­rungen des Motors wirken und daß beim geringsten Passungsfehler oder bei ungleichmäßigem Anziehen der Schrauben und durch das über die Ohren eingeleitete Biegemoment Spannungen entstehen, können am Pumpenge­häuse Deformationen und Brüche auftreten. Diese Defor­mationen wirken sich auch negativ auf die sehr enge Passung zwischen Pumpenkolben und Pumpenkolbenbüchse aus.This type of fastening is disadvantageous because the short tension screws acting on the pump housing at a short distance from the longitudinal axis of the pump nozzle represent a rigid connection which does not permit elastic expansion. Due to the fact that the pulsating gas forces in the combustion chamber and the vibrations of the engine act on the pump nozzle and that tensions occur at the slightest misalignment or when the screws are tightened unevenly and due to the bending moment introduced through the ears, deformations and breaks can occur on the pump housing. These deformations also have a negative effect on the very tight fit between the pump piston and the pump piston liner.

Außerdem muß die Lage der Bohrungen im Flansch für jeden Motortyp entsprechend den spezifischen Gegeben­heiten besonders festgelegt werden, wodurch eine Vielzahl von verschiedenen Ausführungen einer Pumpe­düse auf Lager gehalten und in den Zylinderkopf viele Bohrungen eingearbeitet werden müssen, die diesen strukturell schwächen.In addition, the position of the holes in the flange for each engine type must be specifically determined according to the specific circumstances, which means that a large number of different designs of a pump nozzle must be kept in stock and many holes must be machined in the cylinder head, which weaken them structurally.

Will man eine derartige Befestigung insbesondere bei Pumpedüsen mit einem dichtend aufgeschraubten Kopfgehäuse anwenden, in dessen Innerem sich Stell­organe und Flüssigkeit unter pulsierendem Druck (Druck­spitzen bis 25 bar werden erreicht) befinden, ergibt sich eine weitere Schwierigkeit: Die Verformungen des Pumpengehäuses beim Niederspannen führen zur Undichtigkeit der Verbindung zwischen Pumpengehäuse und Kopfgehäuse, welches deshalb sehr stark ausgeführt werden muß, was die - immer kritischen - Einbaumaße der Pumpedüse vergrößert. Der pulsierende Druck im Inneren des Kopfgehäuses stellt eine weitere Belastung dar, der konstruktiv Rechnung zu tragen ist.If you want to use this type of attachment, in particular for pump nozzles with a sealingly screwed-on head housing, inside which there are actuators and liquid under pulsating pressure (pressure peaks of up to 25 bar are reached), another difficulty arises: The deformations of the pump housing during low-voltage lead to leakage the connection between the pump housing and the head housing, which must therefore be made very strong, which increases the - always critical - installation dimensions of the pump nozzle. The pulsating pressure inside the head housing represents a further burden that has to be taken into account in the design.

Es ist daher Aufgabe der Erfindung, eine Pumpedüse so zu gestalten und zu befestigen, daß alle diese Nachteile nicht auftreten.It is therefore an object of the invention to design and attach a pump nozzle so that all of these disadvantages do not occur.

Erfindungsgemäß wird das durch die kennzeichnenden Merkmale des ersten Ansprüches erreicht. Durch die Länge der Spannschrauben, die Elastizität der Spann­bügel und den Kraftangriff am Kopfgehäuse wird gleich­zeitig die nötige Elastizität der Niederspannung und die Aufnahme der pulsierenden Druckkräfte im Inneren des Kopfgehäuses erreicht. Dadurch daß am Pumpengehäuse keine seitlichen Kräfte mehr angreifen, entstehen im Gehäuse keine Biegespannungen, wodurch dessen Standfestigkeit und Abdichtung gegenüber dem Zylinderkopf verbessert werden.According to the invention this is achieved by the characterizing features of the first claim. Due to the length of the clamping screws, the elasticity of the clamping bracket and the force applied to the head housing, the necessary elasticity of the low voltage and the absorption of the pulsating pressure forces inside the head housing are achieved. Because no lateral forces act on the pump housing, there are no bending stresses in the housing, which improves its stability and sealing against the cylinder head.

Da die Endteile der Spannbügel einfach auf Vorsprüngen des Kopfgehäuses aufliegen, können - insbesondere durch Wahl des Winkels der Spannbügel zur Richtung der Zylinderachse - mit identischen Teilen verschiedene Zylinderabstände realisiert werden.Since the end parts of the clamping brackets simply rest on projections of the head housing, different cylinder spacings can be realized with identical parts, in particular by choosing the angle of the clamping brackets with respect to the direction of the cylinder axis.

Wenn man in weiterer Ausgestaltung der Erfindung die Endteile der Spannbügel ballig gestaltet, können Höhenunterschiede zwischen den Vorsprüngen der Pumpe­düsen ausgeglichen werden.If, in a further embodiment of the invention, the end parts of the clamping bracket are spherical, differences in height between the projections of the pump nozzles can be compensated for.

Im folgenden wird die Erfindung anhand von Figuren beschrieben, wobei Fig. 1 einen Längsschnitt durch die Zylinderkopfwand darstellt, Fig. 2 eine stark vereinfachte Draufsicht auf Fig. 1 und Fig. 3 eine Anordnung derselben Bauteilte bei größerem Zylinder­abstand.The invention is described below with reference to figures, in which FIG. 1 shows a longitudinal section through the cylinder head wall, FIG. 2 shows a greatly simplified plan view of FIG. 1 and FIG. 3 shows an arrangement of the same component parts with a larger cylinder spacing.

In Fig. 1 sind in einer Zylinderkopfwand (1) eine Pumpedüse (2) im Schnitt und eine Pumpedüse (3) in Ansicht dargestellt. Beide werden von einer nicht dargestellten Nockenwelle über Druckstücke (4) vom Motor angetrieben. Die Pumpedüsen (2, 3) werden von einem Pumpengehäuse (5) umfaßt, das in einer Stufen­bohrung (6) der Zylinderkopfwand (1) steckt. Dichtungen und Kraftstoffzu- und -abfuhr zur und von der Pumpe­düse sind der Einfachheit halber nicht dargestellt. Das Pumpengehäuse (5) enthält eine Pumpenkolbenbüchse (7) in der ein Kolben (8) arbeitet. Das Pumpengehäuse (5) ist oben durch ein Kopfgehäuse (13) dicht abge­schlossen, das einen elektromagnetischen Antrieb (14) für das Stellglied (15) enthält, das hier beispiels­weise eine Verdrehungdes Pumpenkolbens (8) bewirkt. Das Innere vom Pumpengehäuse (5) und Kopfgehäuse (13) ist ganz mit Kraftstoff gefüllt. Durch die Arbeitsbe­wegung der Führungshülse (9) herrscht im Ringraum (10) ein pulsierender Druck, der 25 bar erreichen kann. Dieser pflanzt sich durch den elektromagnetischen Antrieb (14) hindurch in den Kopfraum (12) fort. Dadurch entsteht dort eine pulsierende Kraft, die das Kopfgehäuse (13) vom Pumpengehäuse (5) abzuheben trachtet.In Fig. 1, a pump nozzle (2) in section and a pump nozzle (3) are shown in view in a cylinder head wall (1). Both are driven by a camshaft, not shown, via thrust pieces (4) from the engine. The pump nozzles (2, 3) are surrounded by a pump housing (5) which is inserted in a stepped bore (6) in the cylinder head wall (1). Seals and fuel supply and discharge to and from the pump nozzle are not shown for the sake of simplicity. The pump housing (5) contains a pump piston sleeve (7) in which a piston (8) works. The pump housing (5) is sealed off at the top by a head housing (13) which contains an electromagnetic drive (14) for the actuator (15), which here, for example, causes the pump piston (8) to rotate. The inside of the pump housing (5) and head housing (13) is completely filled with fuel. The working movement of the guide sleeve (9) prevails in the annular space (10) a pulsating pressure that can reach 25 bar. This propagates through the electromagnetic drive (14) into the head space (12). This creates a pulsating force there that tries to lift the head housing (13) from the pump housing (5).

Das Kopfgehäuse (13) trägt an gegenüberliegenden Seiten Vorsprünge (20) mit horizontalen Angriffsflächen (21) für Spannbügel (22). Die Spannbügel (22) haben ballige Endteile (23), die auf den Angriffsflächen (21) aufliegen. In der Mitte der Spannbügel (22) greift über eine ballige Beilagscheibe (26) eine Dehnschraube (24) an, die für das Niederspannen der Pumpedüse (2, 3) auf die Zylinderkopfwand (1) sorgt.The head housing (13) has projections (20) on opposite sides with horizontal engagement surfaces (21) for clamping brackets (22). The clamping bracket (22) have spherical end parts (23) which rest on the contact surfaces (21). In the middle of the clamping bracket (22), a expansion screw (24) engages via a spherical washer (26), which ensures that the pump nozzle (2, 3) is clamped down on the cylinder head wall (1).

In Fig. 2 ist zu erkennen, daß die Spannbügel (22) unter einem Winkel (25) gegenüber der Richtung der Motorachse (27) geneigt sind. Wo auf der Angriffs­fläche (21) die Spannbügel (22) angreifen, ist nicht kritisch. Dadurch ist es möglich, identische Pumpe­düsen (2, 3) und Spannbügel (22) gemäß Fig. 3 auch bei größerem Zylinderabstand (28) einzusetzen, wobei sich ein anderer Winkel (25) ergibt, der auch 0° betragen kann. Bei noch größeren Zylinderabständen können natürlich auch längere Spannbügel (22) verwen­det werden.In Fig. 2 it can be seen that the clamping bracket (22) are inclined at an angle (25) relative to the direction of the motor axis (27). Where the clamping brackets (22) engage on the attack surface (21) is not critical. This makes it possible to use identical pump nozzles (2, 3) and clamping brackets (22) according to FIG. 3 even with a larger cylinder spacing (28), a different angle (25) resulting which can also be 0 °. With even larger cylinder distances, longer clamping brackets (22) can of course also be used.

Claims (3)

1. Pumpedüse und Befestigungsvorrichtung für diese, wobei die Pumpedüse aus einem Pumpengehäuse be­steht, das dichtend in eine Stufenbohrung des Zylinderkopfes gedrückt wird und aus einem Kopfge­häuse, das Stellglieder enthält und mit dem Pumpen­gehäuse dicht verbunden ist, dadurch gekennzeichnet, daß das Kopf­gehäuse (13) an zwei gegenüberliegenden Seiten Vorsprünge (20) aufweist, an denen von einer Spann­schraube (24) abwärts gezogene Spannbügel (22) aufliegen, wobei die Endteile (23) der Spannbügel (22) auf den Vorsprüngen (20) je zweier benachbarter Pumpedüsen (2, 3) aufliegen.1. Pump nozzle and fastening device for this, the pump nozzle consisting of a pump housing which is pressed sealingly into a stepped bore of the cylinder head and a head housing which contains actuators and is tightly connected to the pump housing, characterized in that the head housing (13) has projections (20) on two opposite sides against which tensioning brackets (22) drawn down by a tensioning screw (24) rest, the end parts (23) of the tensioning brackets (22) on the projections (20) each of two adjacent pump nozzles (2, 3) lie on. 2. Pumpedüse und Befestigungsvorrichtung für diese nach Anspruch 1, dadurch gekenn­zeichnet, daß die Spannbügel (22) mit der Richtung der Motorlängsachse (27) einen Winkel (25) einschließen.2. Pump nozzle and fastening device for this according to claim 1, characterized in that the clamping bracket (22) with the direction of the motor longitudinal axis (27) enclose an angle (25). 3. Pumpedüse und Befestigungsvorrichtung für diese nach Anspruch 1, dadurch gekenn­zeichnet , daß die Endteile (23) der Spannbügel (22) ballig ausgebildet sind und in der Mitte der Spannbügel (22) eine sphärische Auflage (26) für den Angriff der Spannschraube (24) angeordnet ist.3. Pump nozzle and fastening device for this according to claim 1, characterized in that the end parts (23) of the clamping bracket (22) are spherical and in the middle of the clamping bracket (22) a spherical support (26) for attacking the clamping screw (24 ) is arranged.
EP89118437A 1988-11-14 1989-10-04 Monobloc injection pump and nozzle and fastening device Expired - Lifetime EP0369151B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89118437T ATE87995T1 (en) 1988-11-14 1989-10-04 PUMP NOZZLE AND FIXING DEVICE THEREOF.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8814249U DE8814249U1 (en) 1988-11-14 1988-11-14
DE8814249U 1988-11-14

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EP0369151A1 true EP0369151A1 (en) 1990-05-23
EP0369151B1 EP0369151B1 (en) 1993-04-07

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EP89118437A Expired - Lifetime EP0369151B1 (en) 1988-11-14 1989-10-04 Monobloc injection pump and nozzle and fastening device

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AT (1) ATE87995T1 (en)
DE (2) DE8814249U1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4222081A1 (en) * 1992-07-04 1994-01-05 Kloeckner Humboldt Deutz Ag Diesel internal combustion engine - has fuel injection equipment incorporating injection pump with pump bush, pump being fixed to housing so that bush is not deformed.
US5697345A (en) * 1994-12-28 1997-12-16 Cummins Engine Company, Inc. Clamping load distributor for a fuel injector
US5706786A (en) * 1994-12-28 1998-01-13 Cummins Engine Company, Inc. Distortion reducing load ring for a fuel injector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2547414T3 (en) * 2010-12-15 2015-10-06 Fpt Industrial S.P.A. System for fixing an injector to the engine head of a vehicle, method for fixing the injector, and method of manufacturing the system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072744A (en) * 1980-03-07 1981-10-07 Brunswick Corp Two-cycle engine with fuel injection
EP0057674A2 (en) * 1981-02-02 1982-08-11 Friedmann & Maier Aktiengesellschaft Fuel injection pump for internal combustion engines especially Diesel engines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072744A (en) * 1980-03-07 1981-10-07 Brunswick Corp Two-cycle engine with fuel injection
EP0057674A2 (en) * 1981-02-02 1982-08-11 Friedmann & Maier Aktiengesellschaft Fuel injection pump for internal combustion engines especially Diesel engines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4222081A1 (en) * 1992-07-04 1994-01-05 Kloeckner Humboldt Deutz Ag Diesel internal combustion engine - has fuel injection equipment incorporating injection pump with pump bush, pump being fixed to housing so that bush is not deformed.
DE4222081C2 (en) * 1992-07-04 2003-09-04 Deutz Ag Diesel engine
US5697345A (en) * 1994-12-28 1997-12-16 Cummins Engine Company, Inc. Clamping load distributor for a fuel injector
US5706786A (en) * 1994-12-28 1998-01-13 Cummins Engine Company, Inc. Distortion reducing load ring for a fuel injector

Also Published As

Publication number Publication date
EP0369151B1 (en) 1993-04-07
DE8814249U1 (en) 1989-01-19
ATE87995T1 (en) 1993-04-15
DE58904013D1 (en) 1993-05-13

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