EP1338791A2 - Pump, in particular for a fuel injection system of an internal combustion engine - Google Patents

Pump, in particular for a fuel injection system of an internal combustion engine Download PDF

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Publication number
EP1338791A2
EP1338791A2 EP03001986A EP03001986A EP1338791A2 EP 1338791 A2 EP1338791 A2 EP 1338791A2 EP 03001986 A EP03001986 A EP 03001986A EP 03001986 A EP03001986 A EP 03001986A EP 1338791 A2 EP1338791 A2 EP 1338791A2
Authority
EP
European Patent Office
Prior art keywords
cap
closure cap
bore
housing
pump
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
EP03001986A
Other languages
German (de)
French (fr)
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EP1338791B1 (en
EP1338791A3 (en
Inventor
Dietmar Van Der Linden
Alfons Schoetz
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
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Filing date
Publication date
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Publication of EP1338791A2 publication Critical patent/EP1338791A2/en
Publication of EP1338791A3 publication Critical patent/EP1338791A3/en
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Publication of EP1338791B1 publication Critical patent/EP1338791B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts

Definitions

  • the invention relates to a pump, in particular for a fuel injector for a Internal combustion engine according to the preamble of claim 1.
  • Such a pump is known from DE 198 48 035 A1.
  • This pump has a housing with at least one bore on the inside of the case with the outside of the Housing connects.
  • the hole is by means of a Cap closed by the outside of the Housing is pressed into the hole.
  • the Cap is cup-shaped and has their open end to the outside of the housing.
  • the Closure cap is also said to be on one of these Load inside the housing acting in the bore remain, so that this with high pressure in the hole must be used.
  • this is not the case either ensures that the cap is subjected to high loads, for example, if rotating parts are damaged in the housing, is pressed out of the hole.
  • the pump according to the invention with the features according to claim 1 has the advantage that the cap also remains in the bore at high load. In addition to Pressing also results in a positive fit Connection of the cap with the bore, thereby the Holding force on the cap is increased.
  • FIG. 1 An embodiment of the invention is in the drawing shown and in the description below explained.
  • the figure shows a pump in a cross section with a mounted cap
  • Figure 2 one in Figure 1 marked II with the cap in 3 shows the closure cap in an enlarged view a condition before assembly.
  • a pump is shown, in particular for a fuel injector for a Internal combustion engine, for example of a motor vehicle is provided.
  • the pump takes fuel Pumped high pressure of up to 2000 bar, for example in a memory.
  • the pump has a housing 10 in which a drive shaft 12 is arranged through which one or a plurality of pump elements 14 arranged in the housing 10 are driven.
  • the drive shaft 12 has one Eccentric section 16 on which a cam ring 18 is guided is.
  • the pump element 14 has a pump piston 20, that in an at least approximately radial to the drive shaft 12 extending bore 22 of the housing 10 slidably sealed is led.
  • the pump piston 20 is supported with its Piston foot 21 on the cam ring 18, whereby the piston foot 21 through a spring 24 on the one hand on the housing 10 and on the other hand supported on the piston foot 21, in contact with the cam ring 18 is held.
  • the pump piston 20 is a Pump working space 26 limited by a in the Pump work chamber 26 opening suction valve 28 with a Fuel supply is connectable in the low pressure prevails.
  • the pump work space 26 is also through a pressure valve 30 opening towards the accumulator with the accumulator connectable.
  • the housing 10 also has at least one bore 40 on, for example, the pump element 14 diametrically opposite and which serves to process the Inside of the housing 10 and an assembly of the To enable the pump piston 20 and the spring 24. After this Assembly of the pump must close bore 40 , which is explained in more detail below Cap is used.
  • the bore 40 is as in Figure 2 shown near the outside of the housing 10 circumferential ring recess 42 introduced through the The diameter of the bore 40 is enlarged and in the direction the longitudinal axis 41 of the bore 40 considered one Undercut is formed.
  • the cap 46 is enlarged in one State shown before their assembly in the bore 40.
  • the Cap 46 is made of a relatively soft Material that is plastically deformable, especially from Metal, such as aluminum or copper.
  • the Cap 46 is cup-shaped and has one Floor 48 on which there is a hollow cylindrical wall 49 followed.
  • At the open end of the cap 46, that is the end of the wall 49 facing away from the bottom 48 is an after flange 50 projecting outside with respect to wall 49 molded larger diameter.
  • an inward protruding, circumferential ring web 52 formed.
  • the Ring web 52 is at least at its open end Cap 46 facing edge formed such that the height at which the ring web 52 moves inward from the wall 49 protrudes in the direction of the longitudinal axis 47 of the Cap 46 decreases towards the open end.
  • the edge of the Ring web 52 can be beveled or curved run.
  • the cap 46 is in the bore 40 in the direction its longitudinal axis 47 with its closed end at which the Bottom 48 is arranged in advance. In its final position comes the cap 46 in the direction of insertion their longitudinal axis 47 as shown in Figure 2 with their Flange 50 on the outside of the housing 10 for contact.
  • the Ring web 52 of the cap 46 is then such arranged that he the ring puncture 42 in the bore 40th is at least approximately opposite, that is, with covered this.
  • the cap 46 only has one slightly larger outside diameter than that Diameter of the bore 40 so that the cap 46 with a slight press fit or a transition fit in the bore 40 is arranged.
  • the insert capsule 56 consists of a material that is opposite the material the cap 46 has a higher strength.
  • the Insert capsule 56 can be made of steel, for example.
  • the Insert capsule 56 is also cup-shaped and is with its open end ahead in the cap 46th used.
  • the insert capsule 56 has one Outside diameter that is the same size or slightly larger than the inside diameter of the cap 46 outside the Ring web 52.
  • the outer diameter of the insert capsule 56 is however, this is significantly larger than the inside diameter of the Closure cap 46 in the area of the ring web 52.
  • On her the open end is the insert capsule 56 on its outer jacket beveled or curved so that the outer diameter the insert capsule 56 in the direction of its longitudinal axis open end decreases.
  • a plurality of ring punctures 42 can also be made in the bore 40 and correspondingly several ring webs 52 in the closure cap 46 provided in the direction of the longitudinal axis 47 are arranged offset to each other. This allows the Holding force of the cap 46 can be further increased.

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

Abstract

The bore (40) includes an annular groove (42). An insert (56) is pressed into the cap (48, 49, 50) from the outside of the casing (10). Its strength exceeds that of the cap, which is caused to deform plastically into the groove.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Pumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine nach der Gattung des Anspruchs 1.The invention relates to a pump, in particular for a fuel injector for a Internal combustion engine according to the preamble of claim 1.

Eine solche Pumpe ist durch die DE 198 48 035 A1 bekannt. Diese Pumpe weist ein Gehäuse mit wenigstens einer Bohrung auf, die die Innenseite des Gehäuses mit der Außenseite des Gehäuses verbindet. Die Bohrung ist mittels einer Verschlußkappe verschlossen, die von der Außenseite des Gehäuses her in die Bohrung eingepresst ist. Die Verschlußkappe ist topfförmig ausgebildet und weist mit ihrem offenen Ende zur Außenseite des Gehäuses. Die Verschlußkappe soll auch bei einer auf diese von der Innenseite des Gehäuses wirkenden Belastung in der Bohrung verbleiben, so daß diese mit hoher Pressung in die Bohrung eingesetzt werden muß. Jedoch ist auch hierbei nicht sichergestellt, daß die Verschlußkappe bei hoher Belastung, beispielsweise bei einer Beschädigung von rotierenden Teilen im Gehäuse, aus der Bohrung gedrückt wird.Such a pump is known from DE 198 48 035 A1. This pump has a housing with at least one bore on the inside of the case with the outside of the Housing connects. The hole is by means of a Cap closed by the outside of the Housing is pressed into the hole. The Cap is cup-shaped and has their open end to the outside of the housing. The Closure cap is also said to be on one of these Load inside the housing acting in the bore remain, so that this with high pressure in the hole must be used. However, this is not the case either ensures that the cap is subjected to high loads, for example, if rotating parts are damaged in the housing, is pressed out of the hole.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Pumpe mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, daß die Verschlußkappe auch bei hoher Belastung in der Bohrung verbleibt. Zusätzlich zur Pressung ergibt sich dabei auch eine formschlüssige Verbindung der Verschlußkappe mit der Bohrung, wodurch die Haltekraft auf die Verschlußkappe erhöht ist.The pump according to the invention with the features according to claim 1 has the advantage that the cap also remains in the bore at high load. In addition to Pressing also results in a positive fit Connection of the cap with the bore, thereby the Holding force on the cap is increased.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffeinspritzeinrichtung angegeben. Durch die Ausbildung gemäß Anspruch 2 wird auf einfache Weise die plastische Verformung der Verschlußkappe ermöglicht. Die Ausbildung gemäß Anspruch 3 ermöglicht ein Einpressen des Einsatzteils und eine Verformung des Ringstegs der Verschlußkappe mit relativ geringer Kraft. Die Ausbildung gemäß Anspruch 4 ermöglicht eine einfache Positionierung der Verschlußkappe in Richtung von deren Längsachse, damit deren Ringsteg dem Ringeinstich in der Bohrung gegenüberliegt.In the dependent claims are advantageous Refinements and developments of the invention Fuel injector specified. Through the Training according to claim 2 is the simple plastic deformation of the cap allows. The Training according to claim 3 enables pressing Insert part and a deformation of the ring land Cap with relatively little force. Training according to claim 4 allows easy positioning of the Cap in the direction of its longitudinal axis, so that Ring web is opposite the ring groove in the hole.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur zeigt eine Pumpe in einem Querschnitt mit einer montierten Verschlußkappe, Figur 2 einen in Figur 1 mit II bezeichneten Ausschnitt mit der Verschlußkappe in vergrößerter Darstellung und Figur 3 die Verschlußkappe in einem Zustand vor der Montage.An embodiment of the invention is in the drawing shown and in the description below explained. The figure shows a pump in a cross section with a mounted cap, Figure 2 one in Figure 1 marked II with the cap in 3 shows the closure cap in an enlarged view a condition before assembly.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist eine Pumpe dargestellt, die insbesondere für eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine beispielsweise eines Kraftfahrzeugs vorgesehen ist. Durch die Pumpe wird dabei Kraftstoff unter Hochdruck von bis zu 2000 bar gefördert, beispielsweise in einen Speicher. Die Pumpe weist ein Gehäuse 10 auf, in dem eine Antriebswelle 12 angeordnet ist, durch die ein oder mehrere im Gehäuse 10 angeordnete Pumpenelemente 14 angetrieben werden. Die Antriebswelle 12 weist einen Exzenterabschnitt 16 auf, auf dem ein Hubring 18 geführt ist. Das Pumpenelement 14 weist einen Pumpenkolben 20 auf, der in einer zumindest annähernd radial zur Antriebswelle 12 verlaufenden Bohrung 22 des Gehäuses 10 verschiebbar dicht geführt ist. Der Pumpenkolben 20 stützt sich mit seinem Kolbenfuß 21 am Hubring 18 ab, wobei der Kolbenfuß 21 durch eine Feder 24, die sich einerseits am Gehäuse 10 und andererseits am Kolbenfuß 21 abstützt, in Anlage am Hubring 18 gehalten wird. Durch den Pumpenkolben 20 wird ein Pumpenarbeitsraum 26 begrenzt, der durch ein in den Pumpenarbeitsraum 26 öffnendes Saugventil 28 mit einer Kraftstoffzuführung verbindbar ist, in der Niederdruck herrscht. Der Pumpenarbeitsraum 26 ist außerdem durch ein zum Speicher hin öffnendes Druckventil 30 mit dem Speicher verbindbar. Bei der Rotation der Antriebswelle 12 wird der Pumpenkolben 20 über den Exzenterabschnitt 16 und den Hubring 18 in einer Hubbewegung angetrieben. Wenn der Pumpenkolben 20 sich radial nach innen bewegt, so führt dieser einen Saughub aus, wobei das Saugventil 28 geöffnet ist, so daß Kraftstoff in den Pumpenarbeitsraum 26 einströmt, während das Druckventil 30 geschlossen ist. Wenn der Pumpenkolben 20 sich radial nach außen bewegt, so führt dieser einen Förderhub aus, wobei das Saugventil 28 geschlossen ist und der vom Pumpenkolben 20 verdichtete Kraftstoff durch das geöffnete Druckventil 30 unter hohem Druck in den Speicher gelangt.In Figure 1, a pump is shown, in particular for a fuel injector for a Internal combustion engine, for example of a motor vehicle is provided. The pump takes fuel Pumped high pressure of up to 2000 bar, for example in a memory. The pump has a housing 10 in which a drive shaft 12 is arranged through which one or a plurality of pump elements 14 arranged in the housing 10 are driven. The drive shaft 12 has one Eccentric section 16 on which a cam ring 18 is guided is. The pump element 14 has a pump piston 20, that in an at least approximately radial to the drive shaft 12 extending bore 22 of the housing 10 slidably sealed is led. The pump piston 20 is supported with its Piston foot 21 on the cam ring 18, whereby the piston foot 21 through a spring 24 on the one hand on the housing 10 and on the other hand supported on the piston foot 21, in contact with the cam ring 18 is held. The pump piston 20 is a Pump working space 26 limited by a in the Pump work chamber 26 opening suction valve 28 with a Fuel supply is connectable in the low pressure prevails. The pump work space 26 is also through a pressure valve 30 opening towards the accumulator with the accumulator connectable. When the drive shaft 12 rotates, the Pump piston 20 via the eccentric section 16 and the Hubring 18 driven in one stroke. If the Pump piston 20 moves radially inwards, so leads this one suction stroke, the suction valve 28 being opened is so that fuel in the pump work space 26th flows in while the pressure valve 30 is closed. If the pump piston 20 moves radially outwards, so leads this a delivery stroke, wherein the suction valve 28th is closed and compressed by the pump piston 20 Fuel through the opened pressure valve 30 under high Pressure in the memory.

Das Gehäuse 10 weist außerdem wenigstens eine Bohrung 40 auf, die beispielsweise dem Pumpenelement 14 diametral gegenüberliegt und die dazu dient, eine Bearbeitung der Innenseite des Gehäuses 10 und eine Montage des Pumpenkolbens 20 sowie der Feder 24 zu ermöglichen. Nach dem Zusammenbau der Pumpe muß die Bohrung 40 verschlossen werden, wozu eine nachfolgend näher erläuterte Verschlußkappe verwendet wird. In die Bohrung 40 ist wie in Figur 2 dargestellt nahe der Außenseite des Gehäuses 10 ein umlaufender Ringeinstich 42 eingebracht, durch den der Durchmesser der Bohrung 40 vergrößert ist und in Richtung der Längsachse 41 der Bohrung 40 betrachtet eine Hinterschneidung gebildet ist.The housing 10 also has at least one bore 40 on, for example, the pump element 14 diametrically opposite and which serves to process the Inside of the housing 10 and an assembly of the To enable the pump piston 20 and the spring 24. After this Assembly of the pump must close bore 40 , which is explained in more detail below Cap is used. In the bore 40 is as in Figure 2 shown near the outside of the housing 10 circumferential ring recess 42 introduced through the The diameter of the bore 40 is enlarged and in the direction the longitudinal axis 41 of the bore 40 considered one Undercut is formed.

In Figur 3 ist vergrößert die Verschlußkappe 46 in einem Zustand vor deren Montage in der Bohrung 40 dargestellt. Die Verschlußkappe 46 besteht aus einem relativ weichen Material, das plastisch verformbar ist, insbesondere aus Metall, wie beispielsweise Aluminium oder Kupfer. Die Verschlußkappe 46 ist topfförmig ausgebildet und weist einen Boden 48 auf, an den sich eine hohlzylinderförmige Wand 49 anschließt. Am offenen Ende der Verschlußkappe 46, das ist das dem Boden 48 abgewandte Ende der Wand 49, ist ein nach außen abstehender Flansch 50 mit gegenüber der Wand 49 größerem Durchmesser angeformt. In einem Bereich zwischen dem offenen Ende mit dem Flansch 50 und dem Boden 48 ist an der Wand 49 der Verschlußkappe 46 ein nach innen hervorstehender, umlaufender Ringsteg 52 angeformt. Der Ringsteg 52 ist zumindest an seiner dem offenen Ende der Verschlußkappe 46 zugewandten Rand derart ausgebildet, daß die Höhe, mit der der Ringsteg 52 von der Wand 49 nach innen hervorsteht, in Richtung der Längsachse 47 der Verschlußkappe 46 zum offenen Ende hin abnimmt. Der Rand des Ringstegs 52 kann dabei angeschrägt sein oder gekrümmt verlaufen.In Figure 3, the cap 46 is enlarged in one State shown before their assembly in the bore 40. The Cap 46 is made of a relatively soft Material that is plastically deformable, especially from Metal, such as aluminum or copper. The Cap 46 is cup-shaped and has one Floor 48 on which there is a hollow cylindrical wall 49 followed. At the open end of the cap 46, that is the end of the wall 49 facing away from the bottom 48 is an after flange 50 projecting outside with respect to wall 49 molded larger diameter. In a range between the open end with the flange 50 and the bottom 48 is on the wall 49 of the cap 46 an inward protruding, circumferential ring web 52 formed. The Ring web 52 is at least at its open end Cap 46 facing edge formed such that the height at which the ring web 52 moves inward from the wall 49 protrudes in the direction of the longitudinal axis 47 of the Cap 46 decreases towards the open end. The edge of the Ring web 52 can be beveled or curved run.

Die Verschlußkappe 46 wird in die Bohrung 40 in Richtung ihrer Längsachse 47 mit ihrem geschlossenen Ende, an dem der Boden 48 angeordnet ist, voraus eingesetzt. In ihrer Endlage kommt die Verschlußkappe 46 in Einsetzrichtung in Richtung ihrer Längsachse 47 wie in Figur 2 dargestellt mit ihrem Flansch 50 an der Außenseite des Gehäuses 10 zur Anlage. Der Ringsteg 52 der Verschlußkappe 46 ist dann derart angeordnet, daß er dem Ringeinstich 42 in der Bohrung 40 zumindest annähernd gegenüberliegt, das heißt sich mit diesem überdeckt. Die Verschlußkappe 46 weist einen nur geringfügig größeren Außendurchmesser auf als der Durchmesser der Bohrung 40, so daß die Verschlußkappe 46 mit einer leichten Presspassung oder einer Übergangspassung in der Bohrung 40 angeordnet ist.The cap 46 is in the bore 40 in the direction its longitudinal axis 47 with its closed end at which the Bottom 48 is arranged in advance. In its final position comes the cap 46 in the direction of insertion their longitudinal axis 47 as shown in Figure 2 with their Flange 50 on the outside of the housing 10 for contact. The Ring web 52 of the cap 46 is then such arranged that he the ring puncture 42 in the bore 40th is at least approximately opposite, that is, with covered this. The cap 46 only has one slightly larger outside diameter than that Diameter of the bore 40 so that the cap 46 with a slight press fit or a transition fit in the bore 40 is arranged.

In die Verschlußkappe 46 wird nach deren Einsetzen in die Bohrung 40 von deren offenem Ende her ein Einsatzteil in Form einer Einsatzkapsel 56 eingepresst. Die Einsatzkapsel 56 besteht aus einem Material, das gegenüber dem Material der Verschlußkappe 46 eine höhere Festigkeit aufweist. Die Einsatzkapsel 56 kann beispielsweise aus Stahl bestehen. Die Einsatzkapsel 56 ist ebenfalls topfförmig ausgebildet und wird mit ihrem offenen Ende voraus in die Verschlußkappe 46 eingesetzt. Die Einsatzkapsel 56 weist einen Außendurchmesser auf, der gleich groß oder etwas größer ist als der Innendurchmesser der Verschlußkappe 46 außerhalb des Ringstegs 52. Der Außendurchmesser der Einsatzkapsel 56 ist damit jedoch deutlich größer als der Innendurchmesser der Verschlußkappe 46 im Bereich des Ringstegs 52. An ihrem offenen Ende ist die Einsatzkapsel 56 an ihrem Außenmantel derart angeschrägt oder gekrümmt, daß der Außendurchmesser der Einsatzkapsel 56 in Richtung ihrer Längsachse zum offenen Ende hin abnimmt.In the cap 46 is after inserting it into the Bore 40 from the open end of an insert in Form of an insert capsule 56 pressed. The insert capsule 56 consists of a material that is opposite the material the cap 46 has a higher strength. The Insert capsule 56 can be made of steel, for example. The Insert capsule 56 is also cup-shaped and is with its open end ahead in the cap 46th used. The insert capsule 56 has one Outside diameter that is the same size or slightly larger than the inside diameter of the cap 46 outside the Ring web 52. The outer diameter of the insert capsule 56 is however, this is significantly larger than the inside diameter of the Closure cap 46 in the area of the ring web 52. On her the open end is the insert capsule 56 on its outer jacket beveled or curved so that the outer diameter the insert capsule 56 in the direction of its longitudinal axis open end decreases.

Beim Einsetzen der Einsatzkapsel 56 in die Verschlußkappe 46 gleitet die Einsatzkapsel 56 auf den Ringsteg 52 auf, was durch den angeschrägten oder gekrümmten Rand des Ringstegs 52 und die Anschrägung der Einsatzkapsel 56 zu deren offenem Ende hin erleichtert wird. Infolge der größeren Festigkeit der Einsatzkapsel 56 gegenüber der Verschlußkappe 46 und dem Ringsteg 52 wird beim weiteren Einpressen der Einsatzkapsel 56 der Ringsteg 52 radial nach außen verdrängt und die Verschlußkappe 46 unter plastischer Verformung radial nach außen in den Ringeinstich 42 der Bohrung 40 gepresst. In ihrer Endlage kommt die Einsatzkapsel 56 mit ihrem offenen Ende am Boden 48 der Verschlußkappe 46 zur Anlage. Durch die Einpressung der Verschlußkappe 46 in den Ringeinstich 42 der Bohrung 40 ergibt sich eine formschlüssige Verbindung mit dem Gehäuse 10, die auch bei hoher Belastung in Richtung der Längsachse 47 der Verschlußkappe 46 nicht gelöst wird. Durch die in der Verschlußkappe 46 verbleibende Einsatzkapsel 56 wird außerdem sichergestellt, daß sich die Verschlußkappe 46 nicht radial nach innen verformen und der Formschluß mit dem Ringeinstich 42 gelöst werden kann.When inserting the insert capsule 56 into the closure cap 46 the insert capsule 56 slides onto the ring land 52, what through the beveled or curved edge of the ring land 52 and the bevel of the insert capsule 56 to the open End is relieved. Due to the greater strength the insert capsule 56 opposite the cap 46 and the Ring web 52 becomes the insert capsule during further pressing 56 the annular web 52 is displaced radially outwards and the Cap 46 radially after plastic deformation pressed into the ring recess 42 of the bore 40 on the outside. In the end capsule 56 comes with its open End at the bottom 48 of the cap 46 to the system. Through the Pressing the cap 46 into the ring recess 42 of the Bore 40 results in a positive connection with the housing 10, which also in the direction of the Longitudinal axis 47 of the cap 46 is not released. By the insert capsule 56 remaining in the cap 46 it is also ensured that the cap 46 do not deform radially inwards and the positive connection with the Ring puncture 42 can be solved.

Es können auch mehrere Ringeinstiche 42 in der Bohrung 40 und entsprechend mehrere Ringstege 52 in der Verschlußkappe 46 vorgesehen sein, die in Richtung der Längsachse 47 zueinander versetzt angeordnet sind. Hierdurch kann die Haltekraft der Verschlußkappe 46 weiter erhöht werden.A plurality of ring punctures 42 can also be made in the bore 40 and correspondingly several ring webs 52 in the closure cap 46 provided in the direction of the longitudinal axis 47 are arranged offset to each other. This allows the Holding force of the cap 46 can be further increased.

Claims (5)

Pumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine, mit einem Gehäuse (10) mit wenigstens einer die Innenseite des Gehäuses (10) mit der Außenseite des Gehäuses (10) verbindenden Bohrung (40), die mittels einer von der Außenseite des Gehäuses (10) her in die Bohrung (40) eingepressten Verschlußkappe (46) verschlossen ist, wobei die Verschlußkappe (46) topfförmig ausgebildet ist und mit ihrem offenen Ende zur Außenseite des Gehäuses (10) weist, dadurch gekennzeichnet, daß in die Bohrung (40) wenigstens ein Ringeinstich (42) eingebracht ist, daß in die Verschlußkappe (46) von der Außenseite des Gehäuses (10) her ein Einsatzteil (56) mit gegenüber der Verschlußkappe (46) größerer Festigkeit eingepresst ist und daß durch das Einsatzteil (56) die Verschlußkappe (46) unter plastischer Verformung in den wenigstens einen Ringeinstich (42) der Bohrung (40) gepresst wird.Pump, in particular for a fuel injection device for an internal combustion engine, with a housing (10) with at least one bore (40) connecting the inside of the housing (10) with the outside of the housing (10), which is formed by means of a bore from the outside of the housing (10 ) in the bore (40) pressed closure cap (46) is closed, the closure cap (46) being cup-shaped and with its open end facing the outside of the housing (10), characterized in that at least in the bore (40) a ring recess (42) is inserted that an insert part (56) with greater strength than the closure cap (46) is pressed into the closure cap (46) from the outside of the housing (10) and that the closure cap is inserted through the insert part (56) (46) is pressed with plastic deformation into the at least one ring recess (42) of the bore (40). Pumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Verschlußkappe (46) in ihrem Ausgangszustand vor dem Einpressen des Einsatzteils (56) im Bereich des wenigstens einen Ringeinstichs (42) der Bohrung (40) wenigstens einen nach innen hervorstehenden Ringsteg (52) aufweist, der beim Einpressen des Einsatzteils (56) nach außen gepresst wird. Pump according to claim 1, characterized in that in its initial state the closure cap (46) has at least one ring web (52) projecting inwards in the region of the at least one ring recess (42) of the bore (40) before the insert part (56) is pressed in, which is pressed outwards when the insert (56) is pressed in. Pumpe nach Anspruch 2, dadurch gekennzeichnet, daß die Höhe, mit der der wenigstens eine Ringsteg (52) nach innen in die Verschlußkappe (46) hervorsteht, zum offenen Ende der Verschlußkappe (46) hin abnimmt.Pump according to Claim 2, characterized in that the height at which the at least one ring web (52) projects inwards into the closure cap (46) decreases towards the open end of the closure cap (46). Pumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Verschlußkappe (46) an ihrem offenen Ende einen Flansch (50) mit vergrößertem Durchmesser aufweist, mit dem die Verschlußkappe (46) in Richtung ihrer Längsachse (47) in Einsetzrichtung am Gehäuse (10) zur Anlage kommt.Pump according to one of claims 1 to 3, characterized in that the closure cap (46) has at its open end a flange (50) with an enlarged diameter, with which the closure cap (46) in the direction of its longitudinal axis (47) in the direction of insertion on the housing (10) comes to the plant. Pumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Einsatzteil (56) ebenfalls topfförmig ausgebildet ist und mit seinem offenen Ende zum Boden (48) der Verschlußkappe (46) weist.Pump according to one of claims 1 to 4, characterized in that the insert (56) is also cup-shaped and has its open end facing the bottom (48) of the closure cap (46).
EP20030001986 2002-02-20 2003-01-31 Pump, in particular for a fuel injection system of an internal combustion engine Expired - Lifetime EP1338791B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002107043 DE10207043A1 (en) 2002-02-20 2002-02-20 Cap closure resisting extreme loading in engine fuel injection pump, has hard insert pressed-in to cause interlocking plastic deformation into annular groove
DE10207043 2002-02-20

Publications (3)

Publication Number Publication Date
EP1338791A2 true EP1338791A2 (en) 2003-08-27
EP1338791A3 EP1338791A3 (en) 2004-12-01
EP1338791B1 EP1338791B1 (en) 2006-01-18

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EP (1) EP1338791B1 (en)
JP (1) JP4195315B2 (en)
DE (2) DE10207043A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008113623A1 (en) * 2007-03-16 2008-09-25 Robert Bosch Gmbh High-pressure pump for delivering fuel with an improved design of the bearing arrangement for the support of the cam shaft

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009035015B4 (en) 2009-07-28 2016-05-19 Volkswagen Ag Twist-beam axle for a vehicle and vehicle
KR102286811B1 (en) * 2016-09-29 2021-08-09 엘지전자 주식회사 Compressor

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Publication number Priority date Publication date Assignee Title
EP0292229A1 (en) * 1987-05-19 1988-11-23 A.R.D. Industries Ltd Friction welding flashtrap seal and method of producing same
EP0547592A1 (en) * 1991-12-18 1993-06-23 Clark Equipment Company Inertial welded cylinder and method of making same
DE19848035A1 (en) * 1998-10-17 2000-04-20 Bosch Gmbh Robert Radial piston pump for high fuel pressure in IC engines with common-rail injection system has suction valve closure spring supported on pump piston and contained in long piston bore

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0292229A1 (en) * 1987-05-19 1988-11-23 A.R.D. Industries Ltd Friction welding flashtrap seal and method of producing same
EP0547592A1 (en) * 1991-12-18 1993-06-23 Clark Equipment Company Inertial welded cylinder and method of making same
DE19848035A1 (en) * 1998-10-17 2000-04-20 Bosch Gmbh Robert Radial piston pump for high fuel pressure in IC engines with common-rail injection system has suction valve closure spring supported on pump piston and contained in long piston bore

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008113623A1 (en) * 2007-03-16 2008-09-25 Robert Bosch Gmbh High-pressure pump for delivering fuel with an improved design of the bearing arrangement for the support of the cam shaft

Also Published As

Publication number Publication date
EP1338791B1 (en) 2006-01-18
DE50302210D1 (en) 2006-04-06
DE10207043A1 (en) 2003-08-21
JP4195315B2 (en) 2008-12-10
EP1338791A3 (en) 2004-12-01
JP2003254192A (en) 2003-09-10

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