EP3482062A1 - Method for producing a high-pressure fuel pump - Google Patents

Method for producing a high-pressure fuel pump

Info

Publication number
EP3482062A1
EP3482062A1 EP17722784.0A EP17722784A EP3482062A1 EP 3482062 A1 EP3482062 A1 EP 3482062A1 EP 17722784 A EP17722784 A EP 17722784A EP 3482062 A1 EP3482062 A1 EP 3482062A1
Authority
EP
European Patent Office
Prior art keywords
pump housing
pump
cover element
electrode
fuel
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
EP17722784.0A
Other languages
German (de)
French (fr)
Other versions
EP3482062B1 (en
Inventor
Christoph Lehmeier
Sebastian Bauer
Tamim Latif
Guenther Schaechtner
Stefan BRECHETSBAUER
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 GmbH
Original Assignee
Robert Bosch 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.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3482062A1 publication Critical patent/EP3482062A1/en
Application granted granted Critical
Publication of EP3482062B1 publication Critical patent/EP3482062B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
  • Fuel systems for internal combustion engines are known from the market, in which fuel from a fuel tank is conveyed under high pressure into a high-pressure accumulator ("rail") by means of a pre-demand pump and a mechanically driven high-pressure fuel pump. On or in one
  • Pump housing such a fuel h och d jerk pump is usually arranged a pressure damper device.
  • a pressure damper device usually comprises a cover element and a diaphragm damper arranged between cover element and pump housing, which is usually designed as a gas-filled diaphragm box and is supported on the pump housing via a support element.
  • the pressure damper device is fluidly connected to a low pressure region. It serves to damp pressure pulsations in the low-pressure region of the fuel system, which are caused, for example, by opening and closing operations of valves, for example an intake valve, in the high-pressure fuel pump.
  • High-pressure fuel pump is easier and safer, and makes it possible to construct the pump more advantageous.
  • KEEP welding process In the laser welding process known from the prior art, it is necessary to take precautions to avoid spatter within the pump. By contrast, in the proposed capacitor discharge press-in welding process (KEEP welding process), only a welding discharge in the form of a fixed burr occurs at the connection point. Thus, there is no additional by the KEEP welding process
  • Laser welding process also has a shorter cycle time.
  • a further simplification of the method can be achieved in that the collet and the electrode are realized in total by a single tool.
  • Cover element has an excess to the outer diameter of the pump housing. Connected thereto may 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.
  • the high-pressure fuel pump is thus more compact overall, which is an important requirement in the integration of the high-pressure fuel pump in an internal combustion engine. At the same time increases by this measure, the effective diameter of the lid member. 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 the latter
  • Reference data are compared and then determined based on the comparison, whether the process is done incorrectly or without errors.
  • Figure 1 is a simplified schematic representation of a fuel system for an internal combustion engine
  • Figure 2 is a sectional view of a high-pressure fuel pump
  • FIG. 3 shows a flow chart of the production method according to the invention
  • Figure 4 shows an arrangement for carrying out the inventive
  • FIG. 5 shows an alternative arrangement for carrying out the production method according to the invention
  • FIG. 1 shows a fuel system 10 for a further not shown
  • an inlet valve 24 is arranged, via which a piston chamber 26 with a
  • Low-pressure region 28 the Vor fundamentalpumpe16, the suction line 14, and the Includes fuel tank 12, is fluidically 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 actuator 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 piston longitudinal axis 38 by means of a drive 36 which is designed as a cam disk, which is schematically represented by an arrow with the reference numeral 40.
  • a drive 36 which is designed as a cam disk, which is schematically represented by an arrow with the reference numeral 40.
  • an outlet valve 44 is arranged, which can open to a high-pressure accumulator 46 ("rail").
  • a pressure relief valve 50 which opens when a limiting pressure in the high pressure accumulator 46 is exceeded, the high-pressure accumulator 46 and the
  • Piston space 26 fluidly connected.
  • the fuel high pressure pump 22 is shown in a sectional view in FIG. In the illustration of Figure 2 in the upper part of
  • the pressure damper device 29 comprises a cup-shaped cover element 54, which is connected to the pump housing 52 in a connection region 56, in the present case via a KEEP weld seam (capacitor discharge press-in weld seam).
  • the connection area 56 runs in one
  • Cover member 54 and the pump housing 52 is a diaphragm damper box
  • the KEEP weld between the metallic cover element 54 and the metallic pump housing 52, as shown schematically in FIGS. 3 and 4, is manufactured, for example, as follows: In a first embodiment
  • Sub-electrode 71 is placed and brought into electrical contact with it.
  • the metallic cover element 54 is received in a collet 80 with its open side down and gripped and brought into electrical contact.
  • a third process step
  • Cover element 54 has a slight oversize of 0.5 mm in the example to the outer diameter of the pump housing 52. Therefore, the lid member 54 centered on the pump housing by itself. Thereafter, the actual welding process starts: In a fourth process step 104 is in this case the
  • the collet 80 thus also represents an electrode 70 of the KEEP welding process
  • Pump housing 52 melt both components and connect cohesively when solidifying. This leads to a decrease in the
  • Lid member 54 relative to the pump housing 52.
  • the decrease is limited by a separate mechanical stop 90 on which the collet 80 comes after a defined Absinkweg to the plant.
  • the pump is removed from the welding device. It can optionally be provided that during the process a Absinkweg and / or a current waveform are recorded and that the Absinkweg and / or the current waveform with predetermined, for example, obtained in preliminary tests, reference data are compared and that on the basis of
  • the drop of the collet or the electrode by means of other suitable sensors, such as displacement sensors, detected and pressing after a
  • the cover element 54 has on its radial outer wall 541 a fluid connection 542 in the form of a connecting piece. This variant requires a customized
  • Cover does not completely surround as in the previous example. Instead the lid member 54 is held by a separate collet 80 below the nozzle on the radially outer wall 541 of the cover member 54 to prevent escape of the lid during the welding process to the outside.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a method for producing a high-pressure fuel pump (22) comprising a pump housing (52) and a pot-shaped cover element (54), wherein the pump housing (52) and the cover element (54) are connected by a peripheral weld seam. The method comprises the following steps: - bringing the pump housing (52) into contact with a lower electrode (71), - gripping the cover element (54) using a collet chuck (80) and contacting the cover element (54) with an electrode (72), - bringing the open face of the cover element (54) into contact with the face of the pump housing (52) opposite the lower electrode (71), wherein the cover element (54) is centred on the face of the pump housing (52) opposite the lower electrode (71), - pressing the cover element (54) onto the pump housing (52) in the direction of the lower electrode (72) and introducing an electrical current from the electrode (72) via the cover element (54) and the pump housing (52) into the lower electrode (71) such that fusing occurs at the point of contact between the cover element (54) and the pump housing (52), and such that subsequently the cover element (54) is bonded to the pump housing (52).

Description

Verfahren zur Herstellung einer Kraftstoffhochdruckpumpe  Method for producing a high-pressure fuel pump
Stand der Technik State of the art
Die Erfindung betrifft ein Verfahren zur Herstellung einer The invention relates to a method for producing a
Kraftstoffhochdruckpumpe nach dem Oberbegriff des Anspruchs 1. 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 Vorforderpumpe und einer mechanisch angetriebenen Kraftstoffh och d ruckpumpe unter hohem Druck in einen Hochdruckspeicher ("Rail") gefördert wird. An oder in einem Fuel systems for internal combustion engines are known from the market, in which fuel from a fuel tank is conveyed under high pressure into a high-pressure accumulator ("rail") by means of a pre-demand pump and a mechanically driven high-pressure fuel pump. On or in one
Pumpengehäuse einer solchen Kraftstoffh och d ruckpumpe 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 Pump housing such a fuel h och d jerk pump is usually arranged a pressure damper device. Such a pressure damper device usually comprises a cover element and a diaphragm damper arranged between cover element and pump housing, which is usually designed as a gas-filled diaphragm box and is supported on the pump housing via a support element. The pressure damper device is fluidly connected to a low pressure region. It serves to damp pressure pulsations in the low-pressure region of the fuel system, which are caused, for example, by opening and closing operations of valves, for example an intake valve, in the high-pressure fuel pump. A cohesive connection between the pump housing and the
Deckelelement wird gemäß dem Stand der Technik mittels eines Cover element is according to the prior art by means of a
Laserschweißprozesses hergestellt. Laser welding process produced.
Offenbarung der Erfindung Die vorliegende Erfindung hat den Vorteil, dass die Herstellung der Disclosure of the invention The present invention has the advantage that the production of the
Kraftstoffhochdruckpumpe einfacher und sicherer wird, und ermöglicht es, die Pumpe vorteilhafter zu konstruieren. High-pressure fuel pump is easier and safer, and makes it possible to construct the pump more advantageous.
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 In the laser welding process known from the prior art, it is necessary to take precautions to avoid spatter within the pump. By contrast, in the proposed capacitor discharge press-in welding process (KEEP welding process), only a welding discharge in the form of a fixed burr occurs at the connection point. Thus, there is no additional by the KEEP welding process
Schmutzeintrag in die Pumpe. Weitere Vorkehrungen können insofern entfallen. Der KEEP-Schweißprozess hat gegenüber dem vorbekannten Dirt entry into the pump. Further precautions can be omitted. The KEEP welding process has compared to the previously known
Laserschweißprozess überdies eine kürzere Taktzeit. Laser welding process also has a shorter cycle time.
Erfindungsgemäß ist zur Herstellung einer Kraftstoffhochdruckpumpe mit einem Pumpengehäuse und einem topfförmigen Deckelelement, wobei das According to the invention for producing a high-pressure fuel pump with a pump housing and a cup-shaped cover element, wherein the
Pumpengehäuse das Deckelelement durch eine umlaufende Schweißnaht (360°) miteinander verbunden sind, vorgesehen, dass die in Anspruch 1 angegebenen Prozessschritte durchgeführt werden. Pump housing, the cover member by a circumferential weld (360 °) are connected to each other, provided that the specified in claim 1 process steps are performed.
Eine weitere Vereinfachung des Verfahrens kann dadurch erfolgen, dass die Spannzange und die Elektrode insgesamt durch ein einziges Werkzeug realisiert sind. A further simplification of the method can be achieved in that the collet and the electrode are realized in total by a single tool.
Es kann ferner vorgesehen sein, dass der Innendurchmesser des It can also be provided that the inner diameter of the
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 Cover element has an excess to the outer diameter of the pump housing. Connected thereto may 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. The high-pressure fuel pump is thus more compact overall, which is an important requirement in the integration of the high-pressure fuel pump in an internal combustion engine. At the same time increases by this measure, the effective diameter of the lid member. 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 the latter
Funktionalität auswirkt. 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 Functionality affects. A development of the process provides that a relative movement between the cover element and the pump housing is detected and evaluated during the process. Additionally or alternatively, a
Stromverlauf erfasst und ausgewertet werden. Hierbei ist insbesondere vorgesehen, dass die erfassten Prozessmerkmale mit vorgegebenen Current history can be recorded and evaluated. In this case, provision is made in particular for the detected process features to be predetermined
Referenzdaten verglichen werden und dann auf Basis des Vergleiches festgestellt wird, ob der Prozess fehlerhaft oder fehlerfrei erfolgt ist. Reference data are compared and then determined based on the comparison, whether the process is done incorrectly or without errors.
Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung. Es zeigen: Other features, applications and advantages of the invention will become apparent from the following description of embodiments of the invention. Show it:
Figur 1 eine vereinfachte schematisierte Darstellung eines Kraftstoffsystems für eine Brennkraftmaschine; Figure 1 is a simplified schematic representation of a fuel system for an internal combustion engine;
Figur 2 eine Schnittdarstellung einer Kraftstoffhochdruckpumpe; Figure 2 is a sectional view of a high-pressure fuel pump;
Figur 3 ein Flussdiagramm des erfindungsgemäßen Herstellungsverfahrens FIG. 3 shows a flow chart of the production method according to the invention
Figur 4 eine Anordnung zur Durchführung des erfindungsgemäßen Figure 4 shows an arrangement for carrying out the inventive
Herstellungsverfahrens  manufacturing process
Figur 5 eine alternative Anordnung zur Durchführung des erfindungsgemäßen Herstellungsverfahrens FIG. 5 shows an alternative arrangement for carrying out the production method according to the invention
Figur 1 zeigt ein Kraftstoffsystem 10 für eine weiter nicht dargestellte FIG. 1 shows a fuel system 10 for a further not shown
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 Internal combustion engine in a simplified schematic representation. From a fuel tank 12 is in the operation of the fuel system 10 fuel via a suction line 14, by means of a feed pump 16 and a
Niederdruckleitung 18 über einen Einlass 20 einer als Kolbenpumpe Low pressure line 18 via an inlet 20 as a piston pump
ausgeführten Kraftstoffh och d ruckpumpe 22 zugeführt. Im Einlass 20 ist ein Einlassventil 24 angeordnet, über welches ein Kolbenraum 26 mit einem executed fuel and return pump 22 supplied. In the inlet 20, an inlet valve 24 is arranged, via which a piston chamber 26 with a
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. Low-pressure region 28, the Vorförderpumpe16, the suction line 14, and the Includes fuel tank 12, is fluidically 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 actuator 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 Kraftstoffh och d ruckpumpe 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 A piston 34 of the high-pressure fuel pump 22 can be moved up and down along a piston longitudinal axis 38 by means of a drive 36 which is designed as a cam disk, which is schematically represented by an arrow with the reference numeral 40. Hydraulically between the piston chamber 26 and an outlet port 42 of the fuel high pressure pump 22, an outlet valve 44 is arranged, which can open to a high-pressure accumulator 46 ("rail"). About a pressure relief valve 50, which opens when a limiting pressure in the high pressure accumulator 46 is exceeded, the high-pressure accumulator 46 and the
Kolbenraum 26 fluidisch verbindbar. Piston space 26 fluidly connected.
Die Kraftstoffh och d ruckpumpe 22 ist in Figur 2 in einer Schnittdarstellung gezeigt. In der Darstellung von Figur 2 im oberen Bereich der The fuel high pressure pump 22 is shown in a sectional view in FIG. In the illustration of Figure 2 in the upper part of
Kraftstoffhochdruckpumpe 22 ist die Druckdämpfervorrichtung 29 angeordnet. Die Druckdämpfervorrichtung 29 umfasst ein topfformiges 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 High-pressure fuel pump 22, the pressure damper device 29 is arranged. The pressure damper device 29 comprises a cup-shaped cover element 54, which is connected to the pump housing 52 in a connection region 56, in the present case via a KEEP weld seam (capacitor discharge press-in weld seam). The connection area 56 runs in one
Umfangsrichtung um das Pumpengehäuse 52 herum. Zwischen dem Circumference around the pump housing 52 around. Between the
Deckelelement 54 und dem Pumpengehäuse 52 ist eine Membrandämpfer DoseCover member 54 and the pump housing 52 is a diaphragm damper box
60 mittels zweier Halteelemente gehalten. 60 held by 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 The KEEP weld between the metallic cover element 54 and the metallic pump housing 52, as shown schematically in FIGS. 3 and 4, is manufactured, for example, as follows: In a first embodiment
Prozessschritt 101 wird das metallische Pumpengehäuse 52 auf einer  Process step 101, the metallic pump housing 52 on a
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 ProzessschrittSub-electrode 71 is placed and brought into electrical contact with it. In a second process step 102, the metallic cover element 54 is received in a collet 80 with its open side down and gripped and brought into electrical contact. In a third process step
103 wird die offene Seite des Deckelelements 54 mit der oberen Seite des Pumpengehäuses 52 in Kontakt gebracht. Der Innendurchmesser des 103 becomes the open side of the lid member 54 with the upper side of Pump housing 52 brought into contact. The inner diameter of the
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 dasCover element 54 has a slight oversize of 0.5 mm in the example to the outer diameter of the pump housing 52. Therefore, the lid member 54 centered on the pump housing by itself. Thereafter, the actual welding process starts: In a fourth process step 104 is in this case the
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 hohenCover member 54 pressed with great force on the pump housing 52. After the force has been built, a high current is conducted via the collet 80 into the cover element 54, which flows via the contact point into the pump housing 52 and exits again at the lower electrode 71. The collet 80 thus also represents an electrode 70 of the KEEP welding process
Übergangswiderstand an der Kontaktstelle von Deckelelement 54 und Contact resistance at the contact point of cover element 54 and
Pumpengehäuse 52 schmelzen beide Bauteile auf und verbinden sich beim Erstarren stoffschlüssig. Hierbei kommt es zu einem Absinken des Pump housing 52 melt both components and connect cohesively when solidifying. This leads to a decrease in the
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 Lid member 54 relative to the pump housing 52. The decrease is limited by a separate mechanical stop 90 on which the collet 80 comes after a defined Absinkweg to the plant. In a final process step 105, the pump is removed from the welding device. It can optionally be provided that during the process a Absinkweg and / or a current waveform are recorded and that the Absinkweg and / or the current waveform with predetermined, for example, obtained in preliminary tests, reference data are compared and that on the basis of
Vergleiches festgestellt wird, ob der Prozess fehlerhaft oder fehlerfrei erfolgt ist. It is determined whether the process was carried out incorrectly or without error.
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 As an alternative to the use of the mechanical stop 90, the drop of the collet or the electrode by means of other suitable sensors, such as displacement sensors, detected and pressing after a
vorgegebenen Absinkweg beendet wird. Es kommt dann ebenfalls zu keinem weiteren Absinken mehr. predetermined Absinkweg is terminated. It then comes to no further sinking more.
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 In an alternative embodiment, see FIG. 5, the cover element 54 has on its radial outer wall 541 a fluid connection 542 in the form of a connecting piece. This variant requires a customized
Werkzeugkonzept. Dabei erfolgt die Einleitung der Presskraft und des Stromes wiederum über eine Elektrode 70 die an der Deckeloberseite aufsetzt, aber denTool concept. The introduction of the pressing force and the current again takes place via an electrode 70 which touches down on the top of the lid, but the
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. Cover does not completely surround as in the previous example. Instead the lid member 54 is held by a separate collet 80 below the nozzle on the radially outer wall 541 of the cover member 54 to prevent escape of the lid during the welding process to the outside.

Claims

Ansprüche 1 . Verfahren zur Herstellung einer Kraftstoffh och d ruckpumpe (22) mit einemClaims 1. Method for producing a fuel-boost pump (22) with a
Pumpengehäuse (52) und einem topfförmigen Deckelelement (54), wobei das Pumpengehäuse (52) und das Deckelelement (54) durch eine umlaufende Schweißnaht miteinander verbunden sind, gekennzeichnet durch folgende Schritte: Pump housing (52) and a cup-shaped cover member (54), wherein the pump housing (52) and the cover member (54) are interconnected by a circumferential weld, characterized by the following steps:
- In Kontakt bringen des Pumpengehäuses (52) mit einer Unterelektrode (71 ) Bringing the pump housing (52) into contact with a lower electrode (71)
- Greifen des Deckelelements (54) mit einer Spannzange (80) und kontaktieren des Deckelelements (54) mit einer Elektrode (72), Gripping the cover element (54) with a collet (80) and contacting the cover element (54) with an electrode (72),
- In Kontakt bringen der offenen Seite des Deckelelements (54) mit dem der Unterelektrode (71 ) gegenüberliegenden Seite des Pumpengehäuses (52), wobei sich das Deckelelement (54) auf der der Unterelektrode (71 ) gegenüberliegenden Seite des Pumpengehäuses (52) zentriert, Bringing the open side of the cover element (54) into contact with the side of the pump housing (52) opposite the lower electrode (71), the cover element (54) centering on the side of the pump housing (52) opposite the lower electrode (71),
- Pressen des Deckelelements (54) auf das Pumpengehäuse (52) in - Pressing the lid member (54) on the pump housing (52) in
Richtung der Unterelektrode (71 ) und Einleiten eines elektrischen Stroms von der Elektrode (72) über das Deckelelement (54) und das  Direction of the lower electrode (71) and introducing an electric current from the electrode (72) via the lid member (54) and the
Pumpengehäuse (52) in die Unterelektrode (71 ), sodass es an der  Pump housing (52) in the lower electrode (71), so that it at the
Kontaktstelle zwischen Deckelelement (54) und Pumpengehäuse (52) zu einer Aufschmelzung und nachfolgend zu einer stoffschlüssigen Verbindung des Deckelelements (54) mit dem Pumpengehäuse (52) kommt.  Contact point between the cover element (54) and the pump housing (52) to a melting and subsequently to a cohesive connection of the cover member (54) with the pump housing (52) comes.
2. Verfahren zur Herstellung einer Kraftstoffh och d ruckpumpe (22) nach 2. Method for producing a fuel boost pump (22) after
Anspruch 1 , dadurch gekennzeichnet, dass das Pressen des  Claim 1, characterized in that the pressing of the
Deckelelements (54) auf das Pumpengehäuse (52) durch eine durch die Elektrode in das Deckelelement (54) eingeleitete Kraft erfolgt.  Cover element (54) on the pump housing (52) by a through the electrode in the cover member (54) initiated force takes place.
3. Verfahren zur Herstellung einer Kraftstoffh och d ruckpumpe (22) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die 3. A method for producing a fuel lift pump (22) according to any one of the preceding claims, characterized in that the
Spannzange (80) und die Elektrode (72) insgesamt durch ein einziges Werkzeug (81 , 80,72) realisiert sind. Collet (80) and the electrode (72) in total by a single Tool (81, 80,72) are realized.
Verfahren zum Herstellen einer Kraftstoffh och d ruckpumpe (22) nach Anspruch 3, dadurch gekennzeichnet, dass das Deckelelement (54) in dem einzigen Werkzeug (81 , 80, 72), das zugleich Spannzange (80) und A method of manufacturing a fuel lift pump (22) according to claim 3, characterized in that the lid member (54) in the single tool (81, 80, 72), the collet (80) and
Elektrode (72) realisiert, beim Greifen und Kontaktieren aufgenommen wird. Implemented electrode (72), is picked up when gripping and contacting.
Verfahren zur Herstellung einer Kraftstoffh och d ruckpumpe (22) nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass das A method of manufacturing a fuel lift pump (22) according to claim 1 or claim 2, characterized in that the
Deckelelement (54) auf einer radialen Außenwand (541 ) einen Cover element (54) on a radial outer wall (541) a
Fluidanschluss (542) aufweist und dass die Spannzange (80) das Fluid connection (542) and that the collet (80) the
Deckelelement (54) auf der dem Pumpengehäuse (52) zugewandten Seite des Fluidanschlusses (542) greift, während die Elektrode das Deckelelement (54) auf der dem Pumpengehäuse (52) abgewandten Seite des Cover element (54) on the pump housing (52) facing side of the fluid port (542) engages while the electrode, the cover member (54) on the pump housing (52) facing away from the
Fluidanschlusses (542) kontaktiert. Fluid connection (542) contacted.
Verfahren zur Herstellung einer Kraftstoffh och d ruckpumpe (22) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Method for producing a fuel-boost pump (22) according to one of the preceding claims, characterized in that the
Innendurchmesser des Deckelelements (54) ein Übermaß zum Inner diameter of the lid member (54) an oversize to
Außendurchmesser des Pumpengehäuses (52) aufweist. Outside diameter of the pump housing (52).
Verfahren zur Herstellung einer Kraftstoffh och d ruckpumpe (22) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass es während des Pressens des Deckelelements (54) auf das Pumpengehäuse (52) in Richtung der Unterelektrode (71 ) und/oder während des Einleitens des elektrischen Stroms von der Elektrode (72) über das Deckelelement (54) und das Pumpengehäuse (52) in die Unterelektrode zu einer Relativbewegung zwischen Deckelelements (54) und Pumpengehäuse (52) aufeinander zu kommt. Method for producing a fuel-high-pressure pump (22) according to one of the preceding claims, characterized in that it is pressed onto the pump housing (52) in the direction of the lower electrode (71) during the pressing of the cover element (54) and / or during the introduction of the electrical current from the electrode (72) via the cover member (54) and the pump housing (52) into the sub-electrode to a relative movement between the cover member (54) and the pump housing (52) come to one another.
Verfahren zur Herstellung einer Kraftstoffh och d ruckpumpe (22) nach Anspruch 7, dadurch gekennzeichnet, dass die Relativbewegung durch einen separaten mechanischen Anschlag (90) limitiert wird, an dem die Spannzange (80) und/oder die Elektrode (72) beim Absinken zur Anlage kommen. A method for producing a fuel-boost pump (22) according to claim 7, characterized in that the relative movement is limited by a separate mechanical stop (90) on which the collet (80) and / or the electrode (72) during descent to Plant come.
9. Verfahren zur Herstellung einer Kraftstoffh och d ruckpumpe (22) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass während des Prozesses mindestens ein Prozessmerkmal erfasst wird und dass das Prozessmerkmal mit vorgegebenen Referenzdaten verglichen wird und dass auf Basis des Vergleiches festgestellt wird, ob der Prozess fehlerhaft oder fehlerfrei erfolgt werden. 9. A method for producing a Kraftstoffh or d chuck pump (22) according to any one of the preceding claims, characterized in that during the process at least one process feature is detected and that the process feature is compared with predetermined reference data and that it is determined based on the comparison, whether the process is done incorrectly or without errors.
10. Verfahren zur Herstellung einer Kraftstoffhochdruckpumpe (22) nach dem vorangehenden Anspruch, dadurch gekennzeichnet, dass das 10. A method for producing a high-pressure fuel pump (22) according to the preceding claim, characterized in that the
Prozessmerkmal eine Relativbewegung zwischen Deckelelements (54) und Pumpengehäuse (52) und/oder die Stärke des von der Elektrode (72) zur Unterelektrode (71 ) fließenden Stroms ist.  Process characteristic is a relative movement between the cover element (54) and the pump housing (52) and / or the strength of the current flowing from the electrode (72) to the lower 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)

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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

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EP (1) EP3482062B1 (en)
JP (1) JP6780086B2 (en)
KR (1) KR102311841B1 (en)
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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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CN109477449B (en) 2021-06-15
KR102311841B1 (en) 2021-10-14
JP6780086B2 (en) 2020-11-04
JP2019520518A (en) 2019-07-18
EP3482062B1 (en) 2020-07-08
US10801454B2 (en) 2020-10-13
KR20190025610A (en) 2019-03-11
WO2018007058A1 (en) 2018-01-11
DE102016212469A1 (en) 2018-01-11
US20190309716A1 (en) 2019-10-10

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