EP3482062B1 - Method for producing a high-pressure fuel pump - Google Patents

Method for producing a high-pressure fuel pump Download PDF

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Publication number
EP3482062B1
EP3482062B1 EP17722784.0A EP17722784A EP3482062B1 EP 3482062 B1 EP3482062 B1 EP 3482062B1 EP 17722784 A EP17722784 A EP 17722784A EP 3482062 B1 EP3482062 B1 EP 3482062B1
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EP
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Prior art keywords
cover element
pump housing
electrode
pressure fuel
producing
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EP17722784.0A
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German (de)
French (fr)
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EP3482062A1 (en
Inventor
Christoph Lehmeier
Sebastian Bauer
Tamim Latif
Guenther Schaechtner
Stefan BRECHETSBAUER
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

Definitions

  • the invention relates to a method for producing a high-pressure fuel pump according to the preamble of claim 1.
  • Fuel systems for internal combustion engines are known from the market, in which fuel is conveyed from a fuel tank under high pressure into a high-pressure accumulator ("rail") by means of a prefeed pump and a mechanically driven high-pressure fuel pump.
  • a pressure damper device is usually arranged on or in a pump housing of such a high-pressure fuel pump.
  • Such a pressure damper device usually comprises a cover element and a membrane damper arranged between the cover element and the pump housing, which is usually designed as a gas-filled membrane box and is supported on the pump housing via a support element.
  • the pressure damper device is fluidly connected to a low pressure area.
  • the present invention has the advantage that the manufacture of the high pressure fuel pump becomes easier and safer, and enables the pump to be constructed more advantageously.
  • KEEP welding process In the laser welding process known from the prior art, it is necessary to take precautions in order to avoid welding spatter within the pump.
  • KEEP welding process In the proposed capacitor discharge press-in welding process (KEEP welding process), on the other hand, there is only a welding expulsion in the form of a fixed burr at the connection point. This means that the KEEP welding process does not result in any additional dirt entering the pump. In this respect, further precautions can be omitted.
  • the KEEP welding process also has a shorter cycle time than the previously known laser welding process.
  • the method can be further simplified by the fact that the collet and the electrode as a whole are realized by a single tool.
  • the inside diameter of the cover element has an oversize to the outside diameter of the pump housing. Connected to this it can be provided that the cover element is pushed over the pump housing. In this way, the height of the high-pressure fuel pump is reduced by the amount of overpressure. In this way, the high-pressure fuel pump becomes overall more compact, which is an important requirement when integrating the high-pressure fuel pump into an internal combustion engine. At the same time, this measure also increases the effective diameter of the cover element. In this way it becomes possible to provide an enlarged pressure damper between the cover element and the pump housing, which has a positive effect on its functionality.
  • a further development of the process provides that a relative movement between the cover element and the pump housing is detected and evaluated during the process.
  • a current profile can also be recorded and evaluated.
  • the recorded process features are compared with predetermined reference data and then on the basis of the comparison it is determined whether the process has been carried out with errors or without errors.
  • FIG. 1 shows a fuel system 10 for an internal combustion engine (not shown) in a simplified schematic representation.
  • fuel is supplied from a fuel tank 12 via a suction line 14, by means of a prefeed pump 16 and a low pressure line 18 via an inlet 20 to a high pressure fuel pump 22 designed as a piston pump.
  • An inlet valve 24 is arranged in the inlet 20, via which a piston chamber 26 with a low-pressure region 28, which the prefeed pump 16, the suction line 14, and the Includes fuel tank 12, is fluidly connectable. Pressure pulsations in the low pressure region 28 can be damped by means of a pressure damper device 29.
  • the inlet valve 24 can be forcibly opened via an actuating device 30.
  • the actuating device 30 and thus the inlet valve 24 can be controlled via a control unit 32.
  • a piston 34 of the high-pressure fuel pump 22 can be moved up and down along a longitudinal piston axis 38 by means of a drive 36, which is embodied here as a cam disk, which is shown schematically by an arrow with the reference symbol 40.
  • An outlet valve 44 which can open to a high-pressure accumulator 46 (“rail”), is arranged hydraulically between the piston chamber 26 and an outlet connection 42 of the high-pressure fuel pump 22.
  • the high-pressure accumulator 46 and the piston chamber 26 can be fluidly connected via a pressure-limiting valve 50, which opens when a limit pressure in the high-pressure accumulator 46 is exceeded.
  • the high pressure fuel pump 22 is in Figure 2 shown in a sectional view.
  • the pressure damper device 29 is arranged in the upper region of the high-pressure fuel pump 22.
  • the pressure damper device 29 comprises a cup-shaped cover element 54, which is connected to the pump housing 52 in a connection area 56, in the present case via a KEEP weld seam (capacitor discharge injection weld seam).
  • the connection region 56 runs around the pump housing 52 in a circumferential direction.
  • a diaphragm damper can 60 is held between the cover element 54 and the pump housing 52 by means of two holding elements.
  • the KEEP weld seam between the metallic cover element 54 and the metallic pump housing 52 is, as in FIG Figure 3 and 4th schematically shown, for example, manufactured as follows:
  • a first process step 101 the metallic pump housing 52 is placed on a lower electrode 71 and brought into electrical contact with it.
  • a second process step 102 the metal cover element 54 is received with its open side facing downwards in a collet 80 and thus gripped and brought into electrical contact.
  • a third process step 103 the open side of the cover element 54 is connected to the upper side of the Pump housing 52 contacted.
  • the inside diameter of the cover element 54 has a slight excess of 0.5 mm in the example to the outside diameter of the pump housing 52. Therefore, the cover element 54 centers itself on the pump housing.
  • a fourth process step 104 the cover element 54 is pressed onto the pump housing 52 with great force. After the force has been built up, a high current is fed into the cover element 54 via the collet 80, which flows into the pump housing 52 via the contact point and exits again at the lower electrode 71.
  • the collet 80 thus also represents an electrode 70 of the KEEP welding process. Due to the high contact resistance at the contact point between the cover element 54 and the pump housing 52, both components melt and bond together during solidification. This results in a lowering of the cover element 54 relative to the pump housing 52. The lowering is limited by a separate mechanical stop 90, against which the collet 80 comes into contact after a defined lowering path.
  • a sinking path and / or a current curve are recorded during the process and that the sinking path and / or the current curve are compared with predetermined reference data, for example obtained in preliminary tests, and that it is determined on the basis of the comparison whether the Process has been carried out incorrectly or without errors.
  • the sinking of the collet or the electrode can be detected by means of other suitable sensors, for example displacement sensors, and the pressing can be ended after a predetermined sinking path. Then there is no further drop.
  • the cover element 54 has on its radial outer wall 541 a fluid connection 542 in the form of a connection piece.
  • This variant requires an adapted tool concept.
  • the pressing force and the current are in turn introduced via an electrode 70 which is attached to the top of the lid but does not completely encompass the lid as in the previous example.
  • the cover element 54 is held on the radial outer wall 541 of the cover element 54 via a separate collet 80 below the socket in order to prevent the cover from escaping to the outside during the welding process.

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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)

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Verfahren zur Herstellung einer Kraftstoffhochdruckpumpe nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for producing a high-pressure fuel pump according to the preamble of claim 1.

Vom Markt her bekannt sind Kraftstoffsysteme für Brennkraftmaschinen, bei denen Kraftstoff aus einem Kraftstofftank mittels einer Vorförderpumpe und einer mechanisch angetriebenen Kraftstoffhochdruckpumpe unter hohem Druck in einen Hochdruckspeicher ("Rail") gefördert wird. An oder in einem Pumpengehäuse einer solchen Kraftstoffhochdruckpumpe ist üblicherweise eine Druckdämpfervorrichtung angeordnet. Eine derartige Druckdämpfervorrichtung umfasst meist ein Deckelelement und einen zwischen Deckelelement und Pumpengehäuse angeordneten Membrandämpfer, der üblicherweise als gasgefüllte Membrandose ausgeführt ist und über ein Abstützelement am Pumpengehäuse abgestützt ist. Die Druckdämpfervorrichtung ist dabei fluidisch mit einem Niederdruckbereich verbunden. Sie dient dabei zum Dämpfen von Druckpulsationen in dem Niederdruckbereich des Kraftstoffsystems, die beispielsweise durch Öffnungs- und Schließvorgänge von Ventilen, bspw. eines Einlassventils, in der Kraftstoffhochdruckpumpe hervorgerufen werden. Eine stoffschlüssige Verbindung zwischen dem Pumpengehäuse und dem Deckelelement wird gemäß dem Stand der Technik mittels eines Laserschweißprozesses hergestellt.Fuel systems for internal combustion engines are known from the market, in which fuel is conveyed from a fuel tank under high pressure into a high-pressure accumulator ("rail") by means of a prefeed pump and a mechanically driven high-pressure fuel pump. A pressure damper device is usually arranged on or in a pump housing of such a high-pressure fuel pump. Such a pressure damper device usually comprises a cover element and a membrane damper arranged between the cover element and the pump housing, which is usually designed as a gas-filled membrane box and is supported on the pump housing via a support element. The pressure damper device is fluidly connected to a low pressure area. It serves to dampen pressure pulsations in the low-pressure region of the fuel system, which are caused, for example, by opening and closing processes of valves, for example an intake valve, in the high-pressure fuel pump. A cohesive connection between the pump housing and the cover element is produced according to the prior art by means of a laser welding process.

Offenbarung der ErfindungDisclosure of the invention

Die vorliegende Erfindung hat den Vorteil, dass die Herstellung der Kraftstoffhochdruckpumpe einfacher und sicherer wird, und ermöglicht es, die Pumpe vorteilhafter zu konstruieren.The present invention has the advantage that the manufacture of the high pressure fuel pump becomes easier and safer, and enables the pump to be constructed more advantageously.

Bei dem aus dem Stand der Technik bekannten Laserschweißprozess ist es erforderlich, Vorkehrungen zu treffen, um Schweißspritzer innerhalb der Pumpe zu vermeiden. Bei dem vorgeschlagenen Kondensatorentladungs-Einpress-Schweißprozess (KEEP-Schweißprozess) entsteht hingegen lediglich ein Schweißaustrieb in Form eines festen Grates an der Verbindungsstelle. Somit kommt es durch den KEEP-Schweißprozess zu keinem zusätzlichen Schmutzeintrag in die Pumpe. Weitere Vorkehrungen können insofern entfallen. Der KEEP-Schweißprozess hat gegenüber dem vorbekannten Laserschweißprozess überdies eine kürzere Taktzeit.In the laser welding process known from the prior art, it is necessary to take precautions in order to avoid welding spatter within the pump. In the proposed capacitor discharge press-in welding process (KEEP welding process), on the other hand, there is only a welding expulsion in the form of a fixed burr at the connection point. This means that the KEEP welding process does not result in any additional dirt entering the pump. In this respect, further precautions can be omitted. The KEEP welding process also has a shorter cycle time than the previously known laser welding process.

Erfindungsgemäß ist zur Herstellung einer Kraftstoffhochdruckpumpe mit einem Pumpengehäuse und einem topfförmigen Deckelelement, wobei das Pumpengehäuse das Deckelelement durch eine umlaufende Schweißnaht (360°) miteinander verbunden sind, vorgesehen, dass die in Anspruch 1 angegebenen Prozessschritte durchgeführt werden.According to the invention, for the production of a high-pressure fuel pump with a pump housing and a cup-shaped cover element, the pump housing and the cover element being connected to one another by a circumferential weld seam (360 °), the process steps specified in claim 1 are carried out.

Eine weitere Vereinfachung des Verfahrens kann dadurch erfolgen, dass die Spannzange und die Elektrode insgesamt durch ein einziges Werkzeug realisiert sind.The method can be further simplified by the fact that the collet and the electrode as a whole are realized by a single tool.

Es kann ferner vorgesehen sein, dass der Innendurchmesser des Deckelelements ein Übermaß zum Außendurchmesser des Pumpengehäuses aufweist. Hiermit verbunden kann vorgesehen sein, dass das Deckelelement über das Pumpengehäuse geschoben wird. Auf diese Weise reduziert sich die Höhe der Kraftstoffhochdruckpumpe um den Betrag der Überpressung. Die Kraftstoffhochdruckpumpe wird auf diese Weise insgesamt kompakter, was eine wichtige Anforderung bei der Integration der Kraftstoffhochdruckpumpe in eine Brennkraftmaschine ist. Gleichzeitig vergrößert sich durch diese Maßnahme auch der wirksame Durchmesser des Deckelelements. Auf diese Weise wird es möglich, zwischen dem Deckelelement und dem Pumpengehäuse einen vergrößerten Druckdämpfer vorzusehen, was sich positiv auf dessen Funktionalität auswirkt.It can also be provided that the inside diameter of the cover element has an oversize to the outside diameter of the pump housing. Connected to this it can be provided that the cover element is pushed over the pump housing. In this way, the height of the high-pressure fuel pump is reduced by the amount of overpressure. In this way, the high-pressure fuel pump becomes overall more compact, which is an important requirement when integrating the high-pressure fuel pump into an internal combustion engine. At the same time, this measure also increases the effective diameter of the cover element. In this way it becomes possible to provide an enlarged pressure damper between the cover element and the pump housing, which has a positive effect on its functionality.

Eine Weiterbildung des Prozesses sieht vor, dass während des Prozesses eine Relativbewegung zwischen dem Deckelelement und dem Pumpengehäuse erfasst und ausgewertet wird. Zusätzlich oder alternativ kann auch ein Stromverlauf erfasst und ausgewertet werden. Hierbei ist insbesondere vorgesehen, dass die erfassten Prozessmerkmale mit vorgegebenen Referenzdaten verglichen werden und dann auf Basis des Vergleiches festgestellt wird, ob der Prozess fehlerhaft oder fehlerfrei erfolgt ist.A further development of the process provides that a relative movement between the cover element and the pump housing is detected and evaluated during the process. In addition or as an alternative, a current profile can also be recorded and evaluated. In particular, it is provided here that the recorded process features are compared with predetermined reference data and then on the basis of the comparison it is determined whether the process has been carried out with errors or without errors.

Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung. Es zeigen:

Figur 1
eine vereinfachte schematisierte Darstellung eines Kraftstoffsystems für eine Brennkraftmaschine;
Figur 2
eine Schnittdarstellung einer Kraftstoffhochdruckpumpe;
Figur 3
ein Flussdiagramm des erfindungsgemäßen Herstellungsverfahrens
Figur 4
eine Anordnung zur Durchführung des erfindungsgemäßen Herstellungsverfahrens
Figur 5
eine alternative Anordnung zur Durchführung des erfindungsgemäßen Herstellungsverfahrens
Further features, possible applications and advantages of the invention result from the following description of exemplary embodiments of the invention. Show it:
Figure 1
a simplified schematic representation of a fuel system for an internal combustion engine;
Figure 2
a sectional view of a high pressure fuel pump;
Figure 3
a flowchart of the manufacturing method according to the invention
Figure 4
an arrangement for performing the manufacturing method according to the invention
Figure 5
an alternative arrangement for performing the manufacturing method according to the invention

Figur 1 zeigt ein Kraftstoffsystem 10 für eine weiter nicht dargestellte Brennkraftmaschine in einer vereinfachten schematischen Darstellung. Aus einem Kraftstofftank 12 wird im Betreib des Kraftstoffsystems 10 Kraftstoff über eine Saugleitung 14, mittels einer Vorförderpumpe 16 und einer Niederdruckleitung 18 über einen Einlass 20 einer als Kolbenpumpe ausgeführten Kraftstoffhochdruckpumpe 22 zugeführt. Im Einlass 20 ist ein Einlassventil 24 angeordnet, über welches ein Kolbenraum 26 mit einem Niederdruckbereich 28, der die Vorförderpumpe16, die Saugleitung 14, und den Kraftstofftank 12 umfasst, fluidisch verbindbar ist. Druckpulsationen in dem Niederdruckbereich 28 können mittels einer Druckdämpfervorrichtung 29 gedämpft werden. Das Einlassventil 24 kann über eine Betätigungseinrichtung 30 zwangsweise geöffnet werden. Die Betätigungseinrichtung 30 und damit das Einlassventil 24 sind über eine Steuereinheit 32 ansteuerbar. Figure 1 shows a fuel system 10 for an internal combustion engine (not shown) in a simplified schematic representation. When the fuel system 10 is operating, fuel is supplied from a fuel tank 12 via a suction line 14, by means of a prefeed pump 16 and a low pressure line 18 via an inlet 20 to a high pressure fuel pump 22 designed as a piston pump. An inlet valve 24 is arranged in the inlet 20, via which a piston chamber 26 with a low-pressure region 28, which the prefeed pump 16, the suction line 14, and the Includes fuel tank 12, is fluidly connectable. Pressure pulsations in the low pressure region 28 can be damped by means of a pressure damper device 29. The inlet valve 24 can be forcibly opened via an actuating device 30. The actuating device 30 and thus the inlet valve 24 can be controlled via a control unit 32.

Ein Kolben 34 der Kraftstoffhochdruckpumpe 22 kann mittels eines vorliegend als Nockenscheibe ausgeführten Antriebs 36 entlang einer Kolbenlängsachse 38 auf- und abbewegt werden, was durch einen Pfeil mit dem Bezugszeichen 40 schematisch dargestellt ist. Hydraulisch zwischen dem Kolbenraum 26 und einem Auslassstutzen 42 der Kraftstoffhochdruckpumpe 22 ist ein Auslassventil 44 angeordnet, welches zu einem Hochdruckspeicher 46 ("Rail") hin öffnen kann. Über ein Druckbegrenzungsventil 50, das bei Überschreiten eines Grenzdrucks im Hochdruckspeicher 46 öffnet, sind der Hochdruckspeicher 46 und der Kolbenraum 26 fluidisch verbindbar.A piston 34 of the high-pressure fuel pump 22 can be moved up and down along a longitudinal piston axis 38 by means of a drive 36, which is embodied here as a cam disk, which is shown schematically by an arrow with the reference symbol 40. An outlet valve 44, which can open to a high-pressure accumulator 46 (“rail”), is arranged hydraulically between the piston chamber 26 and an outlet connection 42 of the high-pressure fuel pump 22. The high-pressure accumulator 46 and the piston chamber 26 can be fluidly connected via a pressure-limiting valve 50, which opens when a limit pressure in the high-pressure accumulator 46 is exceeded.

Die Kraftstoffhochdruckpumpe 22 ist in Figur 2 in einer Schnittdarstellung gezeigt. In der Darstellung von Figur 2 im oberen Bereich der Kraftstoffhochdruckpumpe 22 ist die Druckdämpfervorrichtung 29 angeordnet. Die Druckdämpfervorrichtung 29 umfasst ein topfförmiges Deckelelement 54, das mit dem Pumpengehäuse 52 in einem Verbindungsbereich 56 verbunden ist und zwar vorliegend über eine KEEP-Schweißnaht (Kondensator-Entladungs-Einpress-Schweißnaht). Der Verbindungsbereich 56 läuft in einer Umfangsrichtung um das Pumpengehäuse 52 herum. Zwischen dem Deckelelement 54 und dem Pumpengehäuse 52 ist eine Membrandämpfer Dose 60 mittels zweier Halteelemente gehalten.The high pressure fuel pump 22 is in Figure 2 shown in a sectional view. In the representation of Figure 2 The pressure damper device 29 is arranged in the upper region of the high-pressure fuel pump 22. The pressure damper device 29 comprises a cup-shaped cover element 54, which is connected to the pump housing 52 in a connection area 56, in the present case via a KEEP weld seam (capacitor discharge injection weld seam). The connection region 56 runs around the pump housing 52 in a circumferential direction. A diaphragm damper can 60 is held between the cover element 54 and the pump housing 52 by means of two holding elements.

Die KEEP-Schweißnaht zwischen dem metallischen Deckelelement 54 und dem metallischen Pumpengehäuse 52 wird, wie in Figur 3 und 4 schematisch dargestellt, beispielsweise folgendermaßen hergestellt: In einem ersten Prozessschritt 101 wird das metallische Pumpengehäuse 52 auf einer Unterelektrode 71 aufgesetzt und damit elektrisch in Kontakt gebracht. In einem zweiten Prozessschritt 102 wird das metallische Deckelelement 54 in einer Spannzange 80 mit seiner offenen Seite nach unten aufgenommen und damit gegriffen und in elektrischen Kontakt gebracht. In einem dritten Prozessschritt 103 wird die offene Seite des Deckelelements 54 mit der oberen Seite des Pumpengehäuses 52 in Kontakt gebracht. Der Innendurchmesser des Deckelelements 54 weist ein geringfügiges Übermaß von im Beispiel 0,5 mm zum Außendurchmesser des Pumpengehäuses 52 auf. Daher zentriert sich das Deckelelement 54 auf dem Pumpengehäuse von selbst. Danach startet der eigentliche Schweißprozess: In einem vierten Prozessschritt 104 wird hierbei das Deckelelement 54 mit großer Kraft auf das Pumpengehäuse 52 gepresst. Nach Kraftaufbau wird über die Spannzange 80 ein hoher Strom in das Deckelelement 54 geleitet, der über die Kontaktstelle ins Pumpengehäuse 52 fließt und an der Unterelektrode 71 wieder austritt. Die Spannzange 80 stellt insofern zugleich auch eine Elektrode 70 des KEEP-Schweißprozesses dar. Durch den hohen Übergangswiderstand an der Kontaktstelle von Deckelelement 54 und Pumpengehäuse 52 schmelzen beide Bauteile auf und verbinden sich beim Erstarren stoffschlüssig. Hierbei kommt es zu einem Absinken des Deckelelements 54 relativ zu dem Pumpengehäuse 52. Das Absinken wird durch einen separaten mechanischen Anschlag 90 limitiert, an dem die Spannzange 80 nach einem definierten Absinkweg zur Anlage kommt. In einem abschließenden Prozessschritt 105 wird die Pumpe aus der Schweiß-Vorrichtung genommen. Es kann optional vorgesehen sein, dass während des Prozesses ein Absinkweg und/oder ein Stromverlauf aufgezeichnet werden und dass der Absinkweg und/oder der Stromverlauf mit vorgegebenen, beispielsweise in Vorversuchen gewonnenen, Referenzdaten verglichen werden und dass auf Basis des Vergleiches festgestellt wird, ob der Prozess fehlerhaft oder fehlerfrei erfolgt ist.The KEEP weld seam between the metallic cover element 54 and the metallic pump housing 52 is, as in FIG Figure 3 and 4th schematically shown, for example, manufactured as follows: In a first process step 101, the metallic pump housing 52 is placed on a lower electrode 71 and brought into electrical contact with it. In a second process step 102, the metal cover element 54 is received with its open side facing downwards in a collet 80 and thus gripped and brought into electrical contact. In a third process step 103, the open side of the cover element 54 is connected to the upper side of the Pump housing 52 contacted. The inside diameter of the cover element 54 has a slight excess of 0.5 mm in the example to the outside diameter of the pump housing 52. Therefore, the cover element 54 centers itself on the pump housing. The actual welding process then starts: In a fourth process step 104, the cover element 54 is pressed onto the pump housing 52 with great force. After the force has been built up, a high current is fed into the cover element 54 via the collet 80, which flows into the pump housing 52 via the contact point and exits again at the lower electrode 71. The collet 80 thus also represents an electrode 70 of the KEEP welding process. Due to the high contact resistance at the contact point between the cover element 54 and the pump housing 52, both components melt and bond together during solidification. This results in a lowering of the cover element 54 relative to the pump housing 52. The lowering is limited by a separate mechanical stop 90, against which the collet 80 comes into contact after a defined lowering path. In a final process step 105, the pump is removed from the welding device. It can optionally be provided that a sinking path and / or a current curve are recorded during the process and that the sinking path and / or the current curve are compared with predetermined reference data, for example obtained in preliminary tests, and that it is determined on the basis of the comparison whether the Process has been carried out incorrectly or without errors.

Alternativ zur Verwendung des mechanischen Anschlags 90 kann das Absinken der Spannzange bzw. der Elektrode mittels anderer geeigneter Sensorik, beispielsweise Wegsensoren, erfasst und das Pressen nach einem vorgegebenen Absinkweg beendet wird. Es kommt dann ebenfalls zu keinem weiteren Absinken mehr.As an alternative to using the mechanical stop 90, the sinking of the collet or the electrode can be detected by means of other suitable sensors, for example displacement sensors, and the pressing can be ended after a predetermined sinking path. Then there is no further drop.

In einer alternativen Ausführungsform, siehe Figur 5, weist das Deckelelement 54 an seiner radialen Außenwand 541 einen Fluidanschluss 542 in Form eines Anschlussstutzens auf. Diese Variante erfordert ein angepasstes Werkzeugkonzept. Dabei erfolgt die Einleitung der Presskraft und des Stromes wiederum über eine Elektrode 70 die an der Deckeloberseite aufsetzt, aber den Deckel nicht wie im vorangehenden Beispiel vollständig umgreift. Stattdessen wird das Deckelelement 54 über eine separate Spannzange 80 unterhalb des Stutzens an der radialen Außenwand 541 des Deckelelements 54 gehalten, um ein Ausweichen des Deckels während des Schweißprozesses nach außen zu verhindern.In an alternative embodiment, see Figure 5 , the cover element 54 has on its radial outer wall 541 a fluid connection 542 in the form of a connection piece. This variant requires an adapted tool concept. In this case, the pressing force and the current are in turn introduced via an electrode 70 which is attached to the top of the lid but does not completely encompass the lid as in the previous example. Instead the cover element 54 is held on the radial outer wall 541 of the cover element 54 via a separate collet 80 below the socket in order to prevent the cover from escaping to the outside during the welding process.

Claims (10)

  1. Method for producing a high-pressure fuel pump (22) comprising a pump housing (52) and a cup-shaped cover element (54), wherein the pump housing (52) and the cover element (54) are connected to each other by an encircling weld seam, characterized by the following steps:
    - bringing the pump housing (52) into contact with a bottom electrode (71),
    - gripping the cover element (54) with a collet chuck (80) and contacting the cover element (54) with an electrode (72),
    - bringing the open side of the cover element (54) into contact with that side of the pump housing (52) which lies opposite the bottom electrode (71), wherein the cover element (54) is centered on that side of the pump housing (52) which lies opposite the bottom electrode (71),
    - pressing the cover element (54) onto the pump housing (52) in the direction of the bottom electrode (71) and introducing an electrical current from the electrode (72) via the cover element (54) and the pump housing (52) into the bottom electrode (71) such that melting occurs at the contact point between cover element (54) and pump housing (52) and then the cover element (54) is connected to the pump housing (52) in an integrally bonded manner.
  2. Method for producing a high-pressure fuel pump (22) according to Claim 1, characterized in that the cover element (54) is pressed onto the pump housing (52) by means of a force introduced into the cover element (54) by the electrode.
  3. Method for producing a high-pressure fuel pump (22) according to either of the preceding claims, characterized in that the collet chuck (80) and the electrode (72) as a whole are realized by a single tool (81, 80, 72).
  4. Method for producing a high-pressure fuel pump (22) according to Claim 3, characterized in that the cover element (54) is accommodated in the single tool (81, 80, 72), which simultaneously realizes collet chuck (80) and electrode (72), during the gripping and making contact.
  5. Method for producing a high-pressure fuel pump (22) according to Claim 1 or Claim 2, characterized in that the cover element (54) has a fluid connection (542) on a radial outer wall (541), and in that the collet chuck (80) grips the cover element (54) on that side of the fluid connection (542) which faces the pump housing (52), while the electrode makes contact with the cover element (54) on that side of the fluid connection (542) which faces away from the pump housing (52).
  6. Method for producing a high-pressure fuel pump (22) according to one of the preceding claims, characterized in that the inside diameter of the cover element (54) has an excess size in relation to the outside diameter of the pump housing (52).
  7. Method for producing a high-pressure fuel pump (22) according to one of the preceding claims, characterized in that, during the pressing of the cover element (54) onto the pump housing (52) in the direction of the bottom electrode (71) and/or during the introduction of the electrical current from the electrode (72) via the cover element (54) and the pump housing (52) into the bottom electrode, a relative movement between cover element (54) and pump housing (52) onto each other occurs.
  8. Method for producing a high-pressure fuel pump (22) according to Claim 7, characterized in that the relative movement is limited by a separate mechanical stop (90) against which the collet chuck (80) and/or the electrode (72) come into contact as they sink.
  9. Method for producing a high-pressure fuel pump (22) according to one of the preceding claims, characterized in that, during the process, at least one process feature is detected, and in that the process feature is compared with predetermined reference data, and in that it is determined on the basis of the comparison whether the process has taken place in a defective or error-free manner.
  10. Method for producing a high-pressure fuel pump (22) according to the preceding claim, characterized in that the process feature is a relative movement between cover element (54) and pump housing (52) and/or the strength of the current flowing from the electrode (72) to the bottom electrode (71).
EP17722784.0A 2016-07-08 2017-05-11 Method for producing a high-pressure fuel pump Active EP3482062B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016212469.2A DE102016212469A1 (en) 2016-07-08 2016-07-08 Method for producing a high-pressure fuel pump
PCT/EP2017/061272 WO2018007058A1 (en) 2016-07-08 2017-05-11 Method for producing a high-pressure fuel pump

Publications (2)

Publication Number Publication Date
EP3482062A1 EP3482062A1 (en) 2019-05-15
EP3482062B1 true EP3482062B1 (en) 2020-07-08

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EP17722784.0A Active EP3482062B1 (en) 2016-07-08 2017-05-11 Method for producing a high-pressure fuel pump

Country Status (7)

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US (1) US10801454B2 (en)
EP (1) EP3482062B1 (en)
JP (1) JP6780086B2 (en)
KR (1) KR102311841B1 (en)
CN (1) CN109477449B (en)
DE (1) DE102016212469A1 (en)
WO (1) WO2018007058A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102020211105A1 (en) 2020-09-03 2022-03-03 Robert Bosch Gesellschaft mit beschränkter Haftung Device and method for welding a pot-shaped housing cover to a housing body of a high-pressure fuel pump

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Also Published As

Publication number Publication date
WO2018007058A1 (en) 2018-01-11
DE102016212469A1 (en) 2018-01-11
KR20190025610A (en) 2019-03-11
US20190309716A1 (en) 2019-10-10
CN109477449A (en) 2019-03-15
CN109477449B (en) 2021-06-15
JP2019520518A (en) 2019-07-18
US10801454B2 (en) 2020-10-13
EP3482062A1 (en) 2019-05-15
JP6780086B2 (en) 2020-11-04
KR102311841B1 (en) 2021-10-14

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