EP1135605B1 - Fuel injection valve for internal combustion engines and a method for producing same - Google Patents

Fuel injection valve for internal combustion engines and a method for producing same Download PDF

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Publication number
EP1135605B1
EP1135605B1 EP00967601A EP00967601A EP1135605B1 EP 1135605 B1 EP1135605 B1 EP 1135605B1 EP 00967601 A EP00967601 A EP 00967601A EP 00967601 A EP00967601 A EP 00967601A EP 1135605 B1 EP1135605 B1 EP 1135605B1
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EP
European Patent Office
Prior art keywords
adjusting
fuel injection
injection valve
hole
valve member
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.)
Expired - Lifetime
Application number
EP00967601A
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German (de)
French (fr)
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EP1135605A1 (en
Inventor
Oliver Brygier
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1135605A1 publication Critical patent/EP1135605A1/en
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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/083—Having two or more closing springs acting on injection-valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • the invention is based on a fuel injection valve for Internal combustion engine according to the preamble of claim 1 out.
  • a fuel injection valve for Internal combustion engine according to the preamble of claim 1 out.
  • Such, from the patent DE 41 01 235 C known fuel injection valve has two closing springs on, in a formed in the valve holding body spring chamber are arranged and the force of the fuel pressure counteract the valve member. This will be the first Closing spring between the combustion chamber facing away from the end of the spring chamber and one with the valve member via a push rod connected spring plate clamped.
  • the second closing spring supports the combustion chamber facing at one with the valve member connectable stop sleeve, while the combustion chamber facing away End comes to an adjusting bolt to the plant.
  • In the area of the adjusting bolt are in the wall of the spring chamber Dilutions designed to fix the adjusting bolt be caulked inwards.
  • the first closing spring is in the spring chamber introduced and the spring plate on which the Closing spring facing the combustion chamber supports.
  • About the length of Push rod can be the opening pressure of the first closing spring Adjust and over the thickness of the shim the opening pressure of the second closing spring.
  • the adjusting bolt is inserted and provided on the Place caulked.
  • the push rod pushed through the adjusting bolt to the spring plate and the second closing spring, the shim and the stop sleeve arranged.
  • the opening pressure the two closing springs on the fully assembled fuel injector measured.
  • valve body is again detached from the valve holding body and the shim and replaced the push rod according to the measurement result. Subsequently, the fuel injection valve is reassembled and the opening pressures are measured again. This procedure is repeated until the opening pressures comply with the specifications.
  • the fuel injection valve according to the invention for internal combustion engines with the characterizing features of the claim 1 has the advantage that both Closing springs facing away from the combustion chamber each on an adjusting bolt supported by deformation of the surrounding him Wall is fixable and facing the final fixation Move axially with a setting tool in the spring chamber leaves, thereby adjusting the opening pressure without Replacement of components of the fuel injection valve possible becomes.
  • a first advantageous embodiment are at the height of the adjusting bolt in each case at least two inwards directed Verstemmbohrungen formed. This leaves the adjusting bolt securely in a certain position caulk in the spring chamber.
  • At the Lateral surface of the adjusting bolt at least one circumferential Rib formed in the residual wall between the floor the caulking bore and the spring chamber are pressed can, so as to better fix the adjusting bolt too to reach.
  • the Einstellbohrung, through the adjustment tool in the spring chamber is introduced, perpendicular to the axis of the valve member trained, which is technically simple and inexpensive can be realized.
  • the adjustment tool points in this case at the end of the part, which is inserted into the adjustment hole becomes a bevelled shape, causing the adjustment tool when moving into the adjustment hole on a corresponding Advantageously formed bevel on the sliding away from the combustion chamber side of the adjusting tool.
  • an axial force is exerted on the adjusting bolt.
  • the end of the Setting tool is rounded in an advantageous manner formed, which is a sliding of the setting on the Adjustment bolt when moving the adjusting bolt in the spring chamber allows.
  • the combustion chamber is remote Front of the adjusting bolt convex to arched outside. This is a bevel on the adjusting bolt formed, on which the setting tool in an advantageous Way in the axial displacement of the adjusting bolt can attack.
  • a process for producing a Fuel injection valve wherein the adjusting bolt is introduced into the spring chamber and the remaining parts of Fuel injection valve to be assembled.
  • the adjusting bolt can be moved in the spring chamber and adjust the opening pressure permanently, without Parts of the fuel injection valve to be replaced need to re-disassemble and reassemble the Fuel injection valve is necessary.
  • FIG. 1 An embodiment of the fuel injection valve according to the invention for internal combustion engines is in the drawing and will become more apparent in the following description explained. It shows the figure 1 a section through Fuel injection valve with two closing springs, Figure 2 an enlarged detail of Figure 1 in the field of Washer, Figure 3 is an enlarged section of Figure 1 in the region of the adjusting bolt of the first closing spring and FIG. 4 shows the same section as FIG. 3 with a alternative embodiment of the Einstellbohrung and the Adjusting tool.
  • FIG. 1 shows a fuel injection valve according to the invention for internal combustion engines in longitudinal section.
  • the fuel injector has a valve holding body 1, against a valve body 2 with the interposition of a Washer 5 is clamped with a clamping nut 3.
  • a bore 21 is formed in the a piston-shaped, axially movable valve member 12 is arranged is that in the brennraumabgewandten section of the bore 21 is guided.
  • a pressure shoulder 10 formed in a pressure shoulder 10 surrounding Pressure chamber 7 is arranged.
  • the pressure chamber 7 is over one in the valve body 2, the washer 5 and the Valve holding body 1 formed inlet channel 4 with an in the drawing, not shown fuel high pressure source connectable.
  • the combustion chamber-side end of the valve member 12 is a valve sealing surface 14 formed with one in the valve body 2 trained valve seat 17 cooperates.
  • at least one injection channel 19 is arranged, in the closed position of the valve member 12 of the valve sealing surface 14 is closed and in the open position the valve member 12 via a between the valve member 12th and the bore 21 formed annular channel 16 with the pressure chamber 7 is connectable.
  • a first closing spring 27th acted pressure rod 37 to the plant which is largely coaxial is arranged to the longitudinal axis 13 of the valve member 12 and formed into a valve holder body 1 in one Spring chamber 30 protrudes.
  • FIG. 2 shows an enlarged detail of FIG. 1 in FIG Area of the washer 5 shown.
  • the push rod 37 is smaller in diameter than the guided section the valve member 12, so that at the transition of the valve member 12 to the push rod 37 an annular shoulder 11 is formed is.
  • the ring shoulder comes 11 of the valve member 12 to a stop sleeve 8 to the plant, which surrounds the push rod 37 and in the washer 5 is guided.
  • stop sleeve 8 On the outer surface of the stop sleeve 8 is by a Cross-section reduction formed a stop shoulder 25, with the stop sleeve 8 at one in the washer 5 trained stop surface 26 during its stroke comes to the plant. This will be the maximum opening stroke limited the valve member 12. On the combustion chamber side comes the stop sleeve 8 with its end face 23 under the action the closing spring 28 on the end face 22 of the valve body 2 to the plant.
  • a piston-shaped first adjusting bolt 31 arranged and about in the middle between the two ends of the spring chamber 30 a piston-shaped second adjusting bolt 32.
  • the second adjusting bolt 32 has a central bore, which as Guide the push rod 37 is used.
  • the adjusting bolts 31,32 are fixed by caulking in the spring chamber 30.
  • spring plate 24 Between the first adjusting bolt 31 and one on the combustion chamber opposite End of the push rod 37 arranged spring plate 24 is the preferably designed as a helical compression spring first Closing spring 27 arranged under bias.
  • the spring chamber 30 is over a formed in the valve holding body 1 leakage oil passage 36 with a drain line, not shown in the drawing connected.
  • the wall of the spring chamber 30 is at the height of the first adjusting bolt 31 and at the level of the second adjusting bolt 32nd in each case at least one caulking bore designed as a blind hole 43 formed, which is a thin, easily deformable Residual wall 46 of the spring chamber wall forms.
  • the adjusting bolts 31, 32 are one or more, formed circumferential annular webs into which the residual wall 46, between the bottom of the caulking 43 and the spring chamber 30 remains, is pressed.
  • At the height of the brennraumabgewandten End of the adjusting bolt 31,32 is one each formed as a through hole Einstellbohrung 52 formed.
  • FIG. 3 shows a section of FIG. 1 in the region of FIG first adjusting bolt 31.
  • the combustion chamber side facing away from the Adjusting pin 31 is conical, whereby a chamfer 33 is formed.
  • the Einstellbohrung 52 is in the radial direction to the center of the Valve holding body 1 formed out and forms with the axis the adjusting bolt 31 approximately a right angle.
  • an adjustment tool 49 are introduced, with the part of the setting tool 49, which is inserted into the adjusting hole 52, approximately rod-shaped and bevelled at the end is.
  • Figure 4 is an alternative embodiment of the Einstellbohrung 52, here an angle between 30 and 60 degrees, preferably 45 degrees to the axis of the adjusting bolt 31 has.
  • the part of the adjustment tool 49, which in the Adjustment hole 52 is inserted, is rounded at its end trained and comes to the bevel 33 to the plant.
  • the adjusting tool 49 By inserting the adjusting tool 49 in the direction of the adjusting bolt 31, the adjusting bolt 31 in axial Direction to the combustion chamber to move.
  • Corresponding adjustment is made via the adjustment hole or adjustment holes 52 at the second adjusting bolt 32nd
  • the combustion chamber facing away Side of the adjusting bolt 31 not conical, but form convexly curved in another form.
  • the adjustment tool 49 is not, as shown in Figure 3, simply beveled form, but the bevel in another embodiment too realize, so that a slipping of the bevel on the Bevel 33 of the adjusting bolt 31 is possible.
  • the supporting force on the adjusting bolts 31 or 32 can also be several adjustment holes 52 symmetrically the axis of the spring chamber 30 are arranged around and to Setting to be used at the same time.
  • the operation of the fuel injection valve is like follows: At the beginning of the injection cycle, fuel gets under high pressure introduced through the inlet channel 4 in the pressure chamber 7. This results in the pressure shoulder 10 a resulting force in the axial direction away from the combustion chamber, because the valve member 12 through the first closing spring 27 via the push rod 37 with the valve sealing surface 14 on the valve seat 17 is pressed, opens the fuel injection valve only when the fuel pressure in the pressure chamber 7 the opening pressure has reached and the force on the pressure shoulder 10 is greater than the force of the first closing spring 27th By lifting the valve sealing surface 14 from the valve seat 17th the injection channel 19 via the annular channel 16 with the Pressure chamber 7 connected and fuel is in the combustion chamber injected.
  • the closing of the fuel injection valve is characterized initiated that the fuel pressure in the pressure chamber 7 drops, until the force on the pressure shoulder 10 is no longer sufficient, counteract the force of the closing springs 27,28.
  • the valve member 12 is over the stop sleeve 8 and the push rod 37 is accelerated in the direction of the valve seat 17, until the valve member 12 with the valve sealing surface 14 on the valve seat 17 comes back to the plant and the injection channel 19 closes.
  • the first closing spring 27 caused opening pressure measured, whereupon the position of the adjusting bolt 21 or the set opening pressure can be corrected by the fact that the first Adjustment bolt 21 by means of the adjusting tool 49 in his axial position is shifted according to the measurement result. Is the measured opening pressure of the fuel injection valve Too large, the adjusting bolt 31 must away from the combustion chamber to be moved, it is too small, corresponding to the combustion chamber to. This procedure is repeated until the desired opening pressure set at the fuel injection valve is.
  • the opening pressure continuously via a suitable device when moving the adjusting bolt 31 is measured.
  • the adjusting bolt 31 is then in the manner described above by impressing the residual wall 46 of the caulking 43 in the spring chamber 30 caulked.
  • the adjustment tool 49 from the Setting hole 52 removed and the adjustment hole 52 closed. This can be done, for example, that a steel ball is pressed into the adjusting hole 52. In the same way you proceed now in the positioning of the second adjusting bolt 32.
  • the adjustment tool 49 instead of the adjusting force on the adjusting bolt 31,32 via a It is also possible for the adjustment tool 49 to be inclined be provided that the tool at his in the spring chamber introduced end has a cam-like Anformung. The Force on the adjusting bolt is then by twisting the Adjustment tool generated.
  • the described method at to use a fuel injection valve wherein in the spring chamber 30 only one closing spring is arranged.
  • more than two closing springs in the spring chamber 30th are arranged, whose opening pressure in the described Set way by moving an adjusting bolt can be.

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

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Kraftstoffeinspritzventil für Brennkraftmaschinen nach der Gattung des Patentanspruchs 1 aus. Ein derartiges, aus der Patentschrift DE 41 01 235 C bekanntes Kraftstoffeinspritzventil weist zwei Schließfedern auf, die in einem im Ventilhaltekörper ausgebildeten Federraum angeordnet sind und die der Kraft des Kraftstoffdrucks auf das Ventilglied entgegenwirken. Hierbei wird die erste Schließfeder zwischen dem brennraumabgewandten Ende des Federraums und einem mit dem Ventilglied über eine Druckstange verbundenen Federteller verspannt. Die zweite Schließfeder stützt sich brennraumzugewandt an einer mit dem Ventilglied verbindbaren Anschlaghülse ab, während das brennraumabgewandte Ende an einem Einstellbolzen zur Anlage kommt. Im Bereich des Einstellbolzens sind in der Wand des Federraums Verdünnungen ausgebildet, die zur Fixierung des Einstellbolzens nach innen verstemmt werden.The invention is based on a fuel injection valve for Internal combustion engine according to the preamble of claim 1 out. Such, from the patent DE 41 01 235 C known fuel injection valve has two closing springs on, in a formed in the valve holding body spring chamber are arranged and the force of the fuel pressure counteract the valve member. This will be the first Closing spring between the combustion chamber facing away from the end of the spring chamber and one with the valve member via a push rod connected spring plate clamped. The second closing spring supports the combustion chamber facing at one with the valve member connectable stop sleeve, while the combustion chamber facing away End comes to an adjusting bolt to the plant. In the area of the adjusting bolt are in the wall of the spring chamber Dilutions designed to fix the adjusting bolt be caulked inwards.

Bei der Montage des Kraftstoffeinspritzventils geht man folgendermaßen vor: die erste Schließfeder wird in den Federraum eingebracht und der Federteller, an dem sich die Schließfeder brennraumzugewandt abstützt. Über die Länge der Druckstange läßt sich der Öffnungsdruck der ersten Schließfeder einstellen und über die Dicke der Ausgleichsscheibe der Öffnungsdruck der zweiten Schließfeder. Anschließend wird der Einstellbolzen eingeführt und an der vorgesehenen Stelle verstemmt. Im folgenden Schritt wird die Druckstange durch den Einstellbolzen bis zum Federteller geschoben und die zweite Schließfeder, die Ausgleichsscheibe und die Anschlaghülse angeordnet. Schließlich wird der Ventilgrundkörper mit der Spannmutter gegen den Ventilhaltekörper verspannt, wobei das Ventilglied an der Druckstange zur Anlage kommt. Zur Überprüfung der Funktion wird der Öffnungsdruck der beiden Schließfedern am fertig montierten Kraftstoffeinspritzventil gemessen. Stimmt der Öffnungsdruck nicht mit den Vorgaben überein, so wird der Ventilgrundkörper wieder vom Ventilhaltekörper gelöst und die Ausgleichsscheibe und die Druckstange entsprechend dem Meßergebnis ausgetauscht. Anschließend wird das Kraftstoffeinspritzventil wieder zusammengebaut und die Öffnungsdrücke werden erneut gemessen. Dieses Vorgehen wird solange wiederholt, bis die Öffnungsdrücke den Vorgaben entsprechen.When mounting the fuel injection valve, proceed as follows before: the first closing spring is in the spring chamber introduced and the spring plate on which the Closing spring facing the combustion chamber supports. About the length of Push rod can be the opening pressure of the first closing spring Adjust and over the thickness of the shim the opening pressure of the second closing spring. Subsequently the adjusting bolt is inserted and provided on the Place caulked. In the following step, the push rod pushed through the adjusting bolt to the spring plate and the second closing spring, the shim and the stop sleeve arranged. Finally, the valve body clamped with the clamping nut against the valve holding body, the valve member abutting the push rod comes. To check the function, the opening pressure the two closing springs on the fully assembled fuel injector measured. Is the opening pressure not correct? comply with the specifications, then the valve body is again detached from the valve holding body and the shim and replaced the push rod according to the measurement result. Subsequently, the fuel injection valve is reassembled and the opening pressures are measured again. This procedure is repeated until the opening pressures comply with the specifications.

Das bisher verwendete Montageverfahren für Kraftstoffeinspritzventile ist zeitaufwendig und teuer. Darüber hinaus birgt das mehrmalige Auseinanderschrauben und Wiederzusammensetzen des Kraftstoffeinspritzventils die Gefahr, daß Verschmutzungen in den Federraum und in den Bereich des Ventilanschlags gelangen, die ein einwandfreies Funktionieren des Kraftstoffeinspritzventils beeinträchtigen. Es muß eine große Zahl von verschiedenen Längenabstufungen der Druckstange- beziehungsweise Dickenabstufungen der Ausgleichsscheibe hergestellt werden, um beim Austausch das richtige Maß vorrätig zu haben. Eine solche Vorratshaltung bringt zusätzliche Kosten mit sich. The previously used assembly method for fuel injection valves is time consuming and expensive. Furthermore involves the repeated disassembly and reassembly the fuel injection valve the risk that Dirt in the spring chamber and in the area of the valve stop arrive, which a perfect functioning of the fuel injection valve. It has to be one large number of different length increments of push rod or thickness gradations of the shim be made to exchange the right one Measure in stock. Such stockpiling brings additional Costs with you.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Kraftstoffeinspritzventil für Brennkraftmaschinen mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß sich beide Schließfedern brennraumabgewandt jeweils an einem Einstellbolzen abstützen, der durch Verformung der ihn umgebenden Wand fixierbar ist und der sich vor der endgültigen Fixierung mit einem Einstellwerkzeug im Federraum axial verschieben läßt, wodurch ein Einstellen des Öffnungsdrucks ohne Austausch von Bauteilen des Kraftstoffeinspritzventils möglich wird.The fuel injection valve according to the invention for internal combustion engines with the characterizing features of the claim 1 has the advantage that both Closing springs facing away from the combustion chamber each on an adjusting bolt supported by deformation of the surrounding him Wall is fixable and facing the final fixation Move axially with a setting tool in the spring chamber leaves, thereby adjusting the opening pressure without Replacement of components of the fuel injection valve possible becomes.

In einer ersten vorteilhaften Ausgestaltung sind auf der Höhe des Einstellbolzens jeweils wenigstens zwei nach innen gerichtete Verstemmbohrungen ausgebildet. Hierdurch läßt sich der Einstellbolzen sicher in einer bestimmten Position im Federraum verstemmen.In a first advantageous embodiment are at the height of the adjusting bolt in each case at least two inwards directed Verstemmbohrungen formed. This leaves the adjusting bolt securely in a certain position caulk in the spring chamber.

In einer weiteren vorteilhaften Ausgestaltung ist an der Mantelfläche des Einstellbolzens wenigstens eine umlaufende Rippe ausgebildet, die in die Restwand zwischen dem Boden der Verstemmbohrung und dem Federraum eingedrückt werden kann, um so eine bessere Fixierung des Einstellbolzens zu erreichen.In a further advantageous embodiment is at the Lateral surface of the adjusting bolt at least one circumferential Rib formed in the residual wall between the floor the caulking bore and the spring chamber are pressed can, so as to better fix the adjusting bolt too to reach.

In einer weiteren vorteilhaften Ausgestaltung ist die Einstellbohrung, durch die das Einstellwerkzeug in den Federraum eingeführt wird, senkrecht zur Achse des Ventilgliedes ausgebildet, was sich technisch einfach und kostengünstig realisieren läßt. Das Einstellwerkzeug weist in diesem Fall am Ende des Teils, das in die Einstellbohrung eingeführt wird, eine abgeschrägte Form auf, wodurch das Einstellwerkzeug bei der Bewegung in die Einstellbohrung auf einer entsprechenden vorteilhaft ausgebildeten Abschrägung an der brennraumabgewandten Seite des Einstellwerkzeugs abgleitet. Dadurch wird eine axiale Kraft auf den Einstellbolzen ausgeübt. In a further advantageous embodiment, the Einstellbohrung, through the adjustment tool in the spring chamber is introduced, perpendicular to the axis of the valve member trained, which is technically simple and inexpensive can be realized. The adjustment tool points in this case at the end of the part, which is inserted into the adjustment hole becomes a bevelled shape, causing the adjustment tool when moving into the adjustment hole on a corresponding Advantageously formed bevel on the sliding away from the combustion chamber side of the adjusting tool. As a result, an axial force is exerted on the adjusting bolt.

In einer weiteren vorteilhaften Ausgestaltung ist die Einstellbohrung unter einem Winkel von vorzugsweise 45 Grad zur Achse des Ventilgliedes geneigt, was es ermöglicht, hohe axiale Kräfte auf den Einstellbolzen auszuüben. Das Ende des Einstellwerkzeugs ist dabei in vorteilhafter Weise gerundet ausgebildet, was ein Abgleiten des Einstellwerkzeugs auf dem Einstellbolzen beim Verschieben des Einstellbolzens im Federraum ermöglicht.In a further advantageous embodiment, the Einstellbohrung at an angle of preferably 45 degrees to Axis of the valve member inclined, which allows high exert axial forces on the adjusting bolt. The end of the Setting tool is rounded in an advantageous manner formed, which is a sliding of the setting on the Adjustment bolt when moving the adjusting bolt in the spring chamber allows.

In einer weiteren vorteilhaften Ausgestaltung ist die brennraumabgewandte Stirnseite des Einstellbolzens konvex nach außen gewölbt. Dadurch ist am Einstellbolzen eine Abschrägung ausgebildet, an der das Einstellwerkzeug in vorteilhafter Weise bei der axialen Verschiebung des Einstellbolzens angreifen kann.In a further advantageous embodiment, the combustion chamber is remote Front of the adjusting bolt convex to arched outside. This is a bevel on the adjusting bolt formed, on which the setting tool in an advantageous Way in the axial displacement of the adjusting bolt can attack.

Vorteilhaft ist weiterhin ein Verfahren zur Herstellung eines Kraftstoffeinspritzventils, bei der der Einstellbolzen in den Federraum eingebracht wird und die übrigen Teile des Kraftstoffeinspritzventils fertig montiert werden. In einfacher Weise läßt sich der Einstellbolzen im Federraum verschieben und der Öffnungsdruck bleibend einstellen, ohne daß Teile des Kraftstoffeinspritzventils ausgetauscht werden müssen oder ein erneutes Auseinander- und Zusammenbauen des Kraftstoffeinspritzventils nötig ist.A process for producing a Fuel injection valve, wherein the adjusting bolt is introduced into the spring chamber and the remaining parts of Fuel injection valve to be assembled. In simpler Way, the adjusting bolt can be moved in the spring chamber and adjust the opening pressure permanently, without Parts of the fuel injection valve to be replaced need to re-disassemble and reassemble the Fuel injection valve is necessary.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Zeichnung, der Beschreibung und den Patentansprüchen entnehmbar.Further advantages and advantageous embodiments of the subject The invention are the drawing, the description and the claims removed.

Zeichnungdrawing

Ein Ausführungsbeispiel des erfindungsgemäßen Kraftstoffeinspritzventils für Brennkraftmaschinen ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigt die Figur 1 einen Schnitt durch ein Kraftstoffeinspritzventil mit zwei Schließfedern, Figur 2 einen vergrößerten Ausschnitt von Figur 1 im Bereich der Zwischenscheibe, Figur 3 einen vergrößerten Ausschnitt von Figur 1 im Bereich des Einstellbolzens der ersten Schließfeder und Figur 4 den gleichen Ausschnitt wie Figur 3 mit einer alternativen Ausgestaltung der Einstellbohrung und des Einstellwerkzeugs.An embodiment of the fuel injection valve according to the invention for internal combustion engines is in the drawing and will become more apparent in the following description explained. It shows the figure 1 a section through Fuel injection valve with two closing springs, Figure 2 an enlarged detail of Figure 1 in the field of Washer, Figure 3 is an enlarged section of Figure 1 in the region of the adjusting bolt of the first closing spring and FIG. 4 shows the same section as FIG. 3 with a alternative embodiment of the Einstellbohrung and the Adjusting tool.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Figur 1 zeigt ein erfindungsgemäßes Kraftstoffeinspritzventil für Brennkraftmaschinen im Längsschnitt. Das Kraftstoffeinspritzventil weist einen Ventilhaltekörper 1 auf, gegen den ein Ventilgrundkörper 2 unter Zwischenlage einer Zwischenscheibe 5 mit einer Spannmutter 3 verspannt ist. Im Ventilgrundkörper 2 ist eine Bohrung 21 ausgebildet, in der ein kolbenförmiges, axial bewegliches Ventilglied 12 angeordnet ist, das im brennraumabgewandten Abschnitt der Bohrung 21 geführt ist. Durch eine Verjüngung des Ventilgliedes 12 zum Brennraum hin ist am Ventilglied 12 eine Druckschulter 10 ausgebildet, die in einem die Druckschulter 10 umgebenden Druckraum 7 angeordnet ist. Der Druckraum 7 ist über einen im Ventilgrundkörper 2, der Zwischenscheibe 5 und dem Ventilhaltekörper 1 ausgebildeten Zulaufkanal 4 mit einer in der Zeichnung nicht dargestellten Kraftstoffhochdruckquelle verbindbar.FIG. 1 shows a fuel injection valve according to the invention for internal combustion engines in longitudinal section. The fuel injector has a valve holding body 1, against a valve body 2 with the interposition of a Washer 5 is clamped with a clamping nut 3. in the Valve body 2 is a bore 21 is formed in the a piston-shaped, axially movable valve member 12 is arranged is that in the brennraumabgewandten section of the bore 21 is guided. By a taper of the valve member 12 toward the combustion chamber is on the valve member 12 a pressure shoulder 10 formed in a pressure shoulder 10 surrounding Pressure chamber 7 is arranged. The pressure chamber 7 is over one in the valve body 2, the washer 5 and the Valve holding body 1 formed inlet channel 4 with an in the drawing, not shown fuel high pressure source connectable.

Das brennraumseitige Ende des Ventilgliedes 12 ist als Ventildichtfläche 14 ausgebildet, die mit einem im Ventilgrundkörper 2 ausgebildeten Ventilsitz 17 zusammenwirkt. Im Ventilsitz 17 ist wenigstens ein Einspritzkanal 19 angeordnet, der in Schließstellung des Ventilgliedes 12 von der Ventildichtfläche 14 verschlossen wird und in geöffneter Stellung des Ventilgliedes 12 über einen zwischen dem Ventilglied 12 und der Bohrung 21 ausgebildeten Ringkanal 16 mit dem Druckraum 7 verbindbar ist. Am brennraumabgewandten Ende des Ventilgliedes 12 kommt eine von einer ersten Schließfeder 27 beaufschlagte Druckstange 37 zur Anlage, die weitgehend koaxial zur Längsachse 13 des Ventilgliedes 12 angeordnet ist und die bis in einen im Ventilhaltekörper 1 ausgebildeten Federraum 30 ragt.The combustion chamber-side end of the valve member 12 is a valve sealing surface 14 formed with one in the valve body 2 trained valve seat 17 cooperates. In the valve seat 17, at least one injection channel 19 is arranged, in the closed position of the valve member 12 of the valve sealing surface 14 is closed and in the open position the valve member 12 via a between the valve member 12th and the bore 21 formed annular channel 16 with the pressure chamber 7 is connectable. At the combustion chamber remote end of the valve member 12 comes one of a first closing spring 27th acted pressure rod 37 to the plant, which is largely coaxial is arranged to the longitudinal axis 13 of the valve member 12 and formed into a valve holder body 1 in one Spring chamber 30 protrudes.

In Figur 2 ist ein vergrößerter Ausschnitt von Figur 1 im Bereich der Zwischenscheibe 5 gezeigt. Die Druckstange 37 ist im Durchmesser kleiner ausgebildet als der geführte Abschnitt des Ventilgliedes 12, so daß am Übergang des Ventilgliedes 12 zur Druckstange 37 eine Ringschulter 11 ausgebildet ist. Bei der Öffnungshubbewegung kommt die Ringschulter 11 des Ventilgliedes 12 an einer Anschlaghülse 8 zur Anlage, die die Druckstange 37 umgibt und in der Zwischenscheibe 5 geführt ist. Die Anschlaghülse 8, die mehrteilig aufgebaut sein kann, ragt bis in den Federraum 30, wobei ihr brennraumabgewandtes Ende als Federteller ausgebildet ist, an dem ein Ende einer zweiten Schließfeder 28 zur Anlage kommt, durch die das Ventilglied 12 in Schließstellung bringbar ist. An der Außenfläche der Anschlaghülse 8 ist durch eine Querschnittverringerung eine Anschlagschulter 25 ausgebildet, mit der die Anschlaghülse 8 an einer in der Zwischenscheibe 5 ausgebildeten Anschlagfläche 26 bei ihrer Hubbewegung zur Anlage kommt. Dadurch wird der maximale Öffnungshub des Ventilgliedes 12 begrenzt. Auf der Brennraumseite kommt die Anschlaghülse 8 mit ihrer Stirnseite 23 unter Einwirkung der Schließfeder 28 an der Stirnseite 22 des Ventilgrundkörpers 2 zur Anlage.FIG. 2 shows an enlarged detail of FIG. 1 in FIG Area of the washer 5 shown. The push rod 37 is smaller in diameter than the guided section the valve member 12, so that at the transition of the valve member 12 to the push rod 37 an annular shoulder 11 is formed is. During the opening stroke, the ring shoulder comes 11 of the valve member 12 to a stop sleeve 8 to the plant, which surrounds the push rod 37 and in the washer 5 is guided. The stop sleeve 8, which is constructed in several parts may be, extends into the spring chamber 30, with her brennraumabgewandtes End is designed as a spring plate, on the one end of a second closing spring 28 comes to rest, by the valve member 12 can be brought into the closed position is. On the outer surface of the stop sleeve 8 is by a Cross-section reduction formed a stop shoulder 25, with the stop sleeve 8 at one in the washer 5 trained stop surface 26 during its stroke comes to the plant. This will be the maximum opening stroke limited the valve member 12. On the combustion chamber side comes the stop sleeve 8 with its end face 23 under the action the closing spring 28 on the end face 22 of the valve body 2 to the plant.

Nahe dem brennraumabgewandten Ende des Federraums 30 ist ein kolbenförmiger erster Einstellbolzen 31 angeordnet und etwa in der Mitte zwischen den beiden Enden des Federraums 30 ein kolbenförmiger zweiter Einstellbolzen 32. Der zweite Einstellbolzen 32 weist dabei eine Mittelbohrung auf, die als Führung der Druckstange 37 dient. Die Einstellbolzen 31,32 sind durch Verstemmen im Federraum 30 fixiert. Zwischen dem ersten Einstellbolzen 31 und einem am brennraumabgewandten Ende der Druckstange 37 angeordneten Federteller 24 ist die vorzugsweise als Schraubendruckfeder ausgebildete erste Schließfeder 27 unter Vorspannung angeordnet. Entsprechend ist zwischen dem zweiten Einstellbolzen 32 und dem an der Anschlaghülse 8 ausgebildeten Federteller die vorzugsweise als Schraubendruckfeder ausgebildete zweite Schließfeder 28 unter Vorspannung angeordnet. Der Federraum 30 ist über einen im Ventilhaltekörper 1 ausgebildeten Leckölkanal 36 mit einer in der Zeichnung nicht dargestellten Ablaufleitung verbunden.Near the combustion chamber facing away from the end of the spring chamber 30 is a piston-shaped first adjusting bolt 31 arranged and about in the middle between the two ends of the spring chamber 30 a piston-shaped second adjusting bolt 32. The second adjusting bolt 32 has a central bore, which as Guide the push rod 37 is used. The adjusting bolts 31,32 are fixed by caulking in the spring chamber 30. Between the first adjusting bolt 31 and one on the combustion chamber opposite End of the push rod 37 arranged spring plate 24 is the preferably designed as a helical compression spring first Closing spring 27 arranged under bias. Corresponding is between the second adjusting bolt 32 and at the Stop sleeve 8 formed spring plate which preferably formed as a helical compression spring second closing spring 28th arranged under bias. The spring chamber 30 is over a formed in the valve holding body 1 leakage oil passage 36 with a drain line, not shown in the drawing connected.

An der Wand des Federraums 30 ist auf Höhe des ersten Einstellbolzens 31 und auf Höhe des zweiten Einstellbolzens 32 jeweils wenigstens eine als Sacklochbohrung ausgeführte Verstemmbohrung 43 ausgebildet, die eine dünne, leicht verformbare Restwand 46 der Federraumwand formt. An der Außenmantelfläche der Einstellbolzen 31,32 sind ein oder mehrere, umlaufende Ringstege ausgebildet, in die die Restwand 46, die zwischen dem Boden der Verstemmbohrung 43 und dem Federraum 30 verbleibt, eingepreßt wird. Auf Höhe des brennraumabgewandten Endes der Einstellbolzen 31,32 ist jeweils eine als Durchgangsbohrung ausgeführte Einstellbohrung 52 ausgebildet.On the wall of the spring chamber 30 is at the height of the first adjusting bolt 31 and at the level of the second adjusting bolt 32nd in each case at least one caulking bore designed as a blind hole 43 formed, which is a thin, easily deformable Residual wall 46 of the spring chamber wall forms. On the outer surface the adjusting bolts 31, 32 are one or more, formed circumferential annular webs into which the residual wall 46, between the bottom of the caulking 43 and the spring chamber 30 remains, is pressed. At the height of the brennraumabgewandten End of the adjusting bolt 31,32 is one each formed as a through hole Einstellbohrung 52 formed.

Figur 3 zeigt einen Ausschnitt aus Figur 1 im Bereich des ersten Einstellbolzens 31. Die brennraumabgewandte Seite des Einstellbolzens 31 ist konisch ausgebildet, wodurch eine Anschrägung 33 gebildet wird. Mittig zur Achse des Einstellbolzens 31 ist eine Bohrung 55 ausgebildet, durch die Lecköl vom Federraum 30 in die Ablaufleitung 36 strömen kann. Die Einstellbohrung 52 ist in radialer Richtung zur Mitte des Ventilhaltekörpers 1 hin ausgebildet und bildet mit der Achse des Einstellbolzens 31 näherungsweise einen rechten Winkel. Durch die Einstellbohrung 52 kann ein Einstellwerkzeug 49 eingeführt werden, wobei der Teil des Einstellwerkzeugs 49, der in die Einstellbohrung 52 eingeführt wird, näherungsweise stabförmig ausgebildet und am Ende abgeschrägt ist. Durch die Bewegung des Einstellwerkzeugs 49 in den Federraum hinein kommt das Einstellwerkzeug an der Abschrägung 33 des Einstellbolzens 31 zur Anlage. Durch die weitere Bewegung des Einstellwerkzeugs 49 gleitet die Abschrägung des Einstellwerkzeugs 49 auf der Anschrägung 33 ab, wodurch sich eine axiale Kraft auf den Einstellbolzen 31 ergibt, die den Einstellbolzen 31 auf den Brennraum zu verschiebt.FIG. 3 shows a section of FIG. 1 in the region of FIG first adjusting bolt 31. The combustion chamber side facing away from the Adjusting pin 31 is conical, whereby a chamfer 33 is formed. Center to the axis of the adjusting bolt 31, a bore 55 is formed through the leak oil from the spring chamber 30 in the drain line 36 can flow. The Einstellbohrung 52 is in the radial direction to the center of the Valve holding body 1 formed out and forms with the axis the adjusting bolt 31 approximately a right angle. Through the adjustment hole 52, an adjustment tool 49 are introduced, with the part of the setting tool 49, which is inserted into the adjusting hole 52, approximately rod-shaped and bevelled at the end is. By the movement of the adjusting tool 49 in the spring chamber The adjustment tool comes in at the bevel 33 of the adjusting bolt 31 to the plant. By the further movement of the adjusting tool 49 slides the bevel of the Adjusting tool 49 on the chamfer 33 from, resulting in an axial force on the adjusting bolt 31 results, the Adjusting pin 31 shifts to the combustion chamber.

In Figur 4 ist eine alternative Ausgestaltung der Einstellbohrung 52 gezeigt, die hier einen Winkel zwischen 30 und 60 Grad, vorzugsweise 45 Grad zur Achse des Einstellbolzens 31 aufweist. Der Teil des Einstellwerkzeugs 49, der in die Einstellbohrung 52 eingeführt wird, ist an seinem Ende abgerundet ausgebildet und kommt an der Anschrägung 33 zur Anlage. Durch Einschieben des Einstellwerkzeugs 49 in Richtung des Einstellbolzens 31 wird der Einstellbolzen 31 in axialer Richtung auf den Brennraum zu verschoben. Dabei gleitet das Einstellwerkzeug 49 an der Anschrägung 33 ab. Entsprechend erfolgt die Einstellung über die Einstellbohrung oder Einstellbohrungen 52 beim zweiten Einstellbolzen 32.In Figure 4 is an alternative embodiment of the Einstellbohrung 52, here an angle between 30 and 60 degrees, preferably 45 degrees to the axis of the adjusting bolt 31 has. The part of the adjustment tool 49, which in the Adjustment hole 52 is inserted, is rounded at its end trained and comes to the bevel 33 to the plant. By inserting the adjusting tool 49 in the direction of the adjusting bolt 31, the adjusting bolt 31 in axial Direction to the combustion chamber to move. This slides Adjustment tool 49 on the chamfer 33 from. Corresponding adjustment is made via the adjustment hole or adjustment holes 52 at the second adjusting bolt 32nd

Alternativ zu dem in Figur 3 und Figur 4 dargestellten Einstellbolzen 31 kann es auch vorgesehen sein, die brennraumabgewandte Seite des Einstellbolzens 31 nicht konisch, sondern in anderer Form konvex gewölbt auszubilden. Entsprechend ist es auch möglich, das Einstellwerkzeug 49 nicht, wie in Figur 3 dargestellt, einfach abgeschrägt auszubilden, sondern die Abschrägung in einer anderen Ausgestaltung zu realisieren, so daß ein Abgleiten der Abschrägung auf der Anschrägung 33 des Einstellbolzens 31 möglich ist. Zur Vergleichmäßigung der Stützkraft auf die Einstellbolzen 31 oder 32 können auch mehrere Einstellbohrungen 52 symmetrisch um die Achse des Federraums 30 herum angeordnet werden und zur Einstellung zugleich verwendet werden.Alternatively to the adjusting bolt shown in Figure 3 and Figure 4 31 it can also be provided, the combustion chamber facing away Side of the adjusting bolt 31 not conical, but form convexly curved in another form. Corresponding it is also possible, the adjustment tool 49 is not, as shown in Figure 3, simply beveled form, but the bevel in another embodiment too realize, so that a slipping of the bevel on the Bevel 33 of the adjusting bolt 31 is possible. For equalization the supporting force on the adjusting bolts 31 or 32 can also be several adjustment holes 52 symmetrically the axis of the spring chamber 30 are arranged around and to Setting to be used at the same time.

Die Funktionsweise des Kraftstoffeinspritzventils ist wie folgt: Zu Beginn des Einspritzzyklus wird Kraftstoff unter hohem Druck durch den Zulaufkanal 4 in den Druckraum 7 eingeführt. Dadurch ergibt sich auf die Druckschulter 10 eine resultierende Kraft in axialer Richtung vom Brennraum weg, da das Ventilglied 12 durch die erste Schließfeder 27 über die Druckstange 37 mit der Ventildichtfläche 14 auf den Ventilsitz 17 gepreßt wird, öffnet das Kraftstoffeinspritzventil erst, wenn der Kraftstoffdruck im Druckraum 7 den Öffnungsdruck erreicht hat und die Kraft auf die Druckschulter 10 größer ist als die Kraft der ersten Schließfeder 27. Durch das Abheben der Ventildichtfläche 14 vom Ventilsitz 17 wird der Einspritzkanal 19 über den Ringkanal 16 mit dem Druckraum 7 verbunden und Kraftstoff wird in den Brennraum eingespritzt. Da im geschlossenen Zustand des Kraftstoffeinspritzventils ein axialer Abstand zwischen der Ringschulter 11 und der Anschlaghülse 8 besteht, wird der erste Teil der Öffnungshubbewegung des Ventilgliedes 12 nur gegen die Kraft der ersten Schließfeder 27 ausgeführt. Kommt die Ringschulter 11 an der Anschlaghülse 8 zur Anlage, so wird bei der weiteren Öffnungshubbewegung die Anschlaghülse 8 vom Ventilglied 12 mitgeführt. Dafür ist eine größere Kraft notwendig, da nun auch die Kraft der zweiten Schließfeder 28 der Öffnungshubbewegung des Ventilgliedes 12 entgegenwirkt. Nach dem Anschlag des Ventilgliedes 12 mit der Ringschulter 11 an der Anschlaghülse 8 verharrt das Ventilglied 12 deshalb in dieser Position, bis sich durch den nachgeführten Kraftstoff im Druckraum 7 ein entsprechend höherer Kraftstoffdruck aufgebaut hat, der in der Lage ist, über die resultierende Kraft durch die Ringschulter 10 der Kraft beider Schließfedern 27,28 entgegenzuwirken. Im weiteren Verlauf der Öffnungshubbewegung kommt die Anschlaghülse 8 mit ihrer Anschlagschulter 25 an der Anschlagfläche 26 zur Anlage und die Öffnungshubbewegung ist beendet. Durch die Öffnungshubbewegung zu Beginn entgegen der Schließkraft einer und nach durchfahren eines Teilhubs der Kraft zweier Schließfedern (27,28) ergibt sich eine günstige Verlaufsformung der Einspritzung, insbesondere bei der Verwendung des Kraftstoffeinspritzventils in selbstzündenden Brennkraftmaschinen. Das Schließen des Kraftstoffeinspritzventils wird dadurch eingeleitet, daß der Kraftstoffdruck im Druckraum 7 abfällt, bis die Kraft auf die Druckschulter 10 nicht mehr ausreicht, der Kraft der Schließfedern 27,28 entgegenzuwirken. Das Ventilglied 12 wird über die Anschlaghülse 8 und die Druckstange 37 in Richtung auf den Ventilsitz 17 hin beschleunigt, bis das Ventilglied 12 mit der Ventildichtfläche 14 am Ventilsitz 17 wieder zur Anlage kommt und den Einspritzkanal 19 verschließt.The operation of the fuel injection valve is like follows: At the beginning of the injection cycle, fuel gets under high pressure introduced through the inlet channel 4 in the pressure chamber 7. This results in the pressure shoulder 10 a resulting force in the axial direction away from the combustion chamber, because the valve member 12 through the first closing spring 27 via the push rod 37 with the valve sealing surface 14 on the valve seat 17 is pressed, opens the fuel injection valve only when the fuel pressure in the pressure chamber 7 the opening pressure has reached and the force on the pressure shoulder 10 is greater than the force of the first closing spring 27th By lifting the valve sealing surface 14 from the valve seat 17th the injection channel 19 via the annular channel 16 with the Pressure chamber 7 connected and fuel is in the combustion chamber injected. Because in the closed state of the fuel injection valve an axial distance between the annular shoulder 11 and the stop sleeve 8 is made, the first part of Opening stroke of the valve member 12 only against the force the first closing spring 27 executed. Come the ring shoulder 11 to the stop sleeve 8 to the plant, so is in the further opening stroke, the stop sleeve 8 from the valve member 12 carried. This requires a greater force since now also the force of the second closing spring 28 of the opening stroke the valve member 12 counteracts. To the stop of the valve member 12 with the annular shoulder 11 at the stop sleeve 8 remains the valve member 12 therefore in this position, up through the tracked fuel built in the pressure chamber 7, a correspondingly higher fuel pressure who has the ability to think about the resulting Force through the annular shoulder 10 of the force of both closing springs 27,28 counteract. In the course of the opening stroke comes the stop sleeve 8 with its stop shoulder 25 at the stop surface 26 to the system and the opening stroke is completed. Through the opening stroke movement at the beginning against the closing force one and after passing through a partial stroke of the force of two closing springs (27,28) results in a favorable course shaping of the injection, especially when using the fuel injection valve in self-igniting internal combustion engines. The closing of the fuel injection valve is characterized initiated that the fuel pressure in the pressure chamber 7 drops, until the force on the pressure shoulder 10 is no longer sufficient, counteract the force of the closing springs 27,28. The valve member 12 is over the stop sleeve 8 and the push rod 37 is accelerated in the direction of the valve seat 17, until the valve member 12 with the valve sealing surface 14 on the valve seat 17 comes back to the plant and the injection channel 19 closes.

Im folgenden wird ein Verfahren zur Herstellung des oben beschriebenen Kraftstoffeinspritzventils beschrieben. In den Federraum 30 werden die beiden Einstellbolzen 31 und 32 angeordnet, die im Federraum 30 axial verschiebbar sind. Daneben werden in der oben beschriebenen Lage die übrigen Teile im Federraum 30 angeordnet und der Ventilgrundkörper 2 unter Zwischenlage der Zwischenscheibe 5 mit der Spannmutter 3 gegen den Ventilhaltekörper 1 verspannt. Durch die Einstellbohrung 52 des ersten Einstellbolzens 31 wird ein Einstellwerkzeug 49 eingeführt und der erste Einstellbolzen 31 in eine Position entgegen der Kraft der ersten Schließfeder 27 verschoben. Anschließend wird der durch die erste Schließfeder 27 bewirkte Öffnungsdruck gemessen, woraufhin die Lage des Einstellbolzens 21 beziehungsweise der eingestellte Öffnungsdruck dadurch korrigiert werden kann, daß der erste Einstellbolzen 21 mittels des Einstellwerkzeugs 49 in seiner axialen Lage entsprechend dem Meßergebnis verschoben wird. Ist der gemessene Öffnungsdruck des Kraftstoffeinspritzventils zu groß, muß der Einstellbolzen 31 vom Brennraum weg bewegt werden, ist er zu klein, entsprechend auf den Brennraum zu. Dieses Vorgehen wird solange wiederholt, bis der gewünschte Öffnungsdruck am Kraftstoffeinspritzventil eingestellt ist.In the following, a method for producing the above-described Fuel injection valve described. In the Spring chamber 30, the two adjusting bolts 31 and 32 are arranged, which are axially displaceable in the spring chamber 30. Besides become in the situation described above the remaining parts arranged in the spring chamber 30 and the valve body 2 below Intermediate layer of the washer 5 with the clamping nut 3 against braced the valve holding body 1. Through the adjustment hole 52 of the first adjusting bolt 31 becomes an adjusting tool 49 introduced and the first adjusting bolt 31 in a position against the force of the first closing spring 27th postponed. Subsequently, by the first closing spring 27 caused opening pressure measured, whereupon the position of the adjusting bolt 21 or the set opening pressure can be corrected by the fact that the first Adjustment bolt 21 by means of the adjusting tool 49 in his axial position is shifted according to the measurement result. Is the measured opening pressure of the fuel injection valve Too large, the adjusting bolt 31 must away from the combustion chamber to be moved, it is too small, corresponding to the combustion chamber to. This procedure is repeated until the desired opening pressure set at the fuel injection valve is.

Alternativ dazu kann es auch vorgesehen sein, daß der Öffnungsdruck über eine geeignete Vorrichtung kontinuierlich beim Verschieben des Einstellbolzens 31 gemessen wird. Um den ersten Einstellbolzen 31 in der gefundenen optimalen Position zu fixieren, wird der Einstellbolzen 31 anschließend in der oben beschriebenen Weise durch Eindrücken der Restwand 46 der Verstemmbohrung 43 im Federraum 30 verstemmt. Nach dem Verstemmen wird das Einstellwerkzeug 49 aus der Einstellbohrung 52 entfernt und die Einstellbohrung 52 verschlossen. Dies kann beispielsweise dadurch geschehen, daß eine Stahlkugel in die Einstellbohrung 52 eingepreßt wird. In gleicher Weise verfährt man nun bei der Positionierung des zweiten Einstellbolzens 32.Alternatively, it may also be provided that the opening pressure continuously via a suitable device when moving the adjusting bolt 31 is measured. Around the first adjusting bolt 31 in the optimum position found to fix, the adjusting bolt 31 is then in the manner described above by impressing the residual wall 46 of the caulking 43 in the spring chamber 30 caulked. After caulking, the adjustment tool 49 from the Setting hole 52 removed and the adjustment hole 52 closed. This can be done, for example, that a steel ball is pressed into the adjusting hole 52. In the same way you proceed now in the positioning of the second adjusting bolt 32.

Statt die Stellkraft auf den Einstellbolzen 31,32 über eine Schräge des Einstellwerkzeugs 49 auszuüben, kann es auch vorgesehen sein, daß das Werkzeug an seinem in den Federraum eingeführten Ende eine nockenartige Anformung aufweist. Die Kraft auf den Einstellbolzen wird dann durch verdrehen des Einstellwerkzeugs erzeugt.Instead of the adjusting force on the adjusting bolt 31,32 via a It is also possible for the adjustment tool 49 to be inclined be provided that the tool at his in the spring chamber introduced end has a cam-like Anformung. The Force on the adjusting bolt is then by twisting the Adjustment tool generated.

Es kann auch vorgesehen sein, das beschriebene Verfahren bei einem Kraftstoffeinspritzventil zu verwenden, bei dem im Federraum 30 nur eine Schließfeder angeordnet ist. Ebenso ist es möglich, daß mehr als zwei Schließfedern im Federraum 30 angeordnet sind, deren Öffnungsdruck in der beschriebenen Weise durch Verschieben eines Einstellbolzens eingestellt werden kann.It can also be provided, the described method at to use a fuel injection valve, wherein in the spring chamber 30 only one closing spring is arranged. Likewise is it is possible that more than two closing springs in the spring chamber 30th are arranged, whose opening pressure in the described Set way by moving an adjusting bolt can be.

Claims (16)

  1. Fuel injection valve for internal combustion engines with a valve-holding body (1), in which a piston-shaped valve member (12) is arranged, which can be moved axially against the force of at least one closing spring (27, 28) and, over part of its length, is guided in a hole (21) and which, at its combustion-chamber end, controls the opening of at least one injection passage (19), and with a spring space (30), which accommodates the at least one closing spring (27, 28) and is formed in the valve-holding body (1) further away from the combustion chamber than the guided portion of the valve member (12), the valve member (12) being acted upon by the at least one closing spring (27, 28), which is in each case supported at the opposite end from the combustion chamber by a piston-shaped adjusting stud (31, 32), which is fixed in position by deformation of a residual wall (46) of the spring space (30) by caulking, and with a pressure shoulder (10), which is formed on the valve member (12) and can be subjected to fuel under high pressure, with the result that, at a certain opening pressure, a resultant force in the axial direction on the valve member (12) that is greater than the force of the at least one closing spring (27, 28) is exerted, characterized in that at least one adjusting hole (52), which is formed as a through-hole in the wall of the spring space (30) and through which an adjusting tool (49) that can be used to adjust the axial position of the adjusting stud (31, 32) can be introduced, is formed in the valve-holding body (1) approximately at the level of the adjusting stud (31, 32).
  2. Fuel injection valve according to Claim 1, characterized in that the residual wall (46) of the valve-holding body (1) is formed approximately at the level of the adjusting stud (31, 32) by at least one inward-pointing caulking hole (43) designed as a pocket hole, the residual wall (46) being pressed inwards in the process of caulking the adjusting stud (31, 32).
  3. Fuel injection valve according to Claim 1, characterized in that at least one encircling rib, which is pressed into the pressed-in residual wall (46) during the caulking of the adjusting stud (31, 32), is formed on the lateral surface of the adjusting stud (31, 32).
  4. Fuel injection valve according to Claim 3, characterized in that the caulking hole (43) is essentially perpendicular to the longitudinal axis (13) of the valve member (12).
  5. Fuel injection valve according to Claim 1, characterized in that the adjusting hole (52) extends radially from the outer lateral surface of the valve-holding body (1) to the spring space (30).
  6. Fuel injection valve according to Claim 5, characterized in that the adjusting hole (52) is formed essentially perpendicularly to the longitudinal axis (13) of the valve member (12).
  7. Fuel injection valve according to Claim 5, characterized in that the adjusting hole (52) is formed at an angle of 30 to 60 degrees to the longitudinal axis (13) of the valve member (12), preferably about 45 degrees.
  8. Fuel injection valve according to Claim 5, characterized in that a plurality of adjusting holes, which are preferably arranged symmetrically around the longitudinal axis of the spring space (30), is arranged in the valve-holding body (1).
  9. Fuel injection valve according to Claim 1, characterized in that the adjusting stud (31, 32) has a hollow-cylindrical shape.
  10. Fuel injection valve according to Claim 1, characterized in that the opposite side of the adjusting stud (31, 32) from the combustion chamber has a convexly curved shape.
  11. Fuel injection valve according to Claim 1, characterized in that the opposite side of the adjusting stud (31, 32) from the combustion chamber has a conical shape, the tip of the cone pointing away from the combustion chamber.
  12. Fuel injection valve according to Claim 1, characterized in that that part of the adjusting tool (49) which is introduced into the adjusting hole (52) is of essentially rod-shaped design and is bevelled at the end introduced.
  13. Fuel injection valve according to Claim 1, characterized in that that part of the adjusting tool (49) which is introduced into the adjusting hole (52) is of essentially rod-shaped design and is rounded at the end introduced.
  14. Method for the production of a fuel injection valve according to Claim 1, in which, before being fixed, the adjusting studs (31, 32) are adjusted by means of an adjusting tool (49) until the desired opening pressure of the valve member (12) has been achieved by means of the preloading force, obtained by displacement of the adjusting stud (31, 32), of the closing spring (27, 28) in contact there.
  15. Method according to Claim 14, characterized in that the displacement of the adjusting stud (31, 32) is effected by displacement of a contact surface, acting axially on the adjusting stud (31, 32), of a tool (49), which can be introduced through the wall of the spring space (30), against the opening force acting on the valve member (12).
  16. Method according to Claim 14, characterized by the following method steps:
    introduction of an adjusting tool (49) through an adjusting hole (52) formed in the wall of the spring space (30), so that the adjusting tool (49) acts on the adjusting stud (31, 32),
    displacement of the adjusting stud (31, 32) in the axial direction by means of the adjusting tool (49), the opening pressure of the fuel injection valve being measured until the opening pressure of the fuel injection valve corresponds to a specified value,
    deformation of the residual wall (46) of the spring space (30) at the level of the adjusting stud (31, 32), the adjusting stud (31, 32) being fixed in its position,
    removal of the adjusting tool (49) from the adjusting hole (52).
EP00967601A 1999-10-01 2000-09-20 Fuel injection valve for internal combustion engines and a method for producing same Expired - Lifetime EP1135605B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19947195 1999-10-01
DE19947195A DE19947195A1 (en) 1999-10-01 1999-10-01 Fuel injection valve for diesel engine has spring force of closure spring acting on valve element adjusted via setting bolt for determining opening pressure of injection valve
PCT/DE2000/003268 WO2001025621A1 (en) 1999-10-01 2000-09-20 Fuel injection valve for internal combustion engines and a method for producing same

Publications (2)

Publication Number Publication Date
EP1135605A1 EP1135605A1 (en) 2001-09-26
EP1135605B1 true EP1135605B1 (en) 2005-02-02

Family

ID=7924066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00967601A Expired - Lifetime EP1135605B1 (en) 1999-10-01 2000-09-20 Fuel injection valve for internal combustion engines and a method for producing same

Country Status (9)

Country Link
EP (1) EP1135605B1 (en)
JP (1) JP4587259B2 (en)
KR (1) KR100791043B1 (en)
CN (1) CN1171014C (en)
BR (1) BR0007194B1 (en)
DE (2) DE19947195A1 (en)
RU (1) RU2267640C2 (en)
SK (1) SK287015B6 (en)
WO (1) WO2001025621A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009015528B4 (en) * 2009-04-02 2021-08-12 Man Energy Solutions Se Valve unit of a fuel supply system
CA2809249C (en) * 2013-03-15 2014-03-11 Westport Power Inc. Apparatus for controlling the lift of a valve member
FR3062175A1 (en) * 2017-01-24 2018-07-27 Delphi International Operations Luxembourg S.A R.L. METHOD FOR ASSEMBLING A FUEL INJECTOR
JP7470254B2 (en) * 2021-05-12 2024-04-17 日立Astemo株式会社 Fuel Injection

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122769B (en) * 1954-05-11 1962-01-25 Nylands Verksted Device for automatic regulation of the fuel injection point in internal combustion engines
DE4101235C1 (en) 1991-01-17 1992-06-04 Robert Bosch Gmbh, 7000 Stuttgart, De

Also Published As

Publication number Publication date
SK287015B6 (en) 2009-09-07
KR20010090853A (en) 2001-10-19
BR0007194A (en) 2001-09-04
CN1327515A (en) 2001-12-19
CN1171014C (en) 2004-10-13
DE50009418D1 (en) 2005-03-10
RU2267640C2 (en) 2006-01-10
EP1135605A1 (en) 2001-09-26
KR100791043B1 (en) 2008-01-03
SK7362001A3 (en) 2002-02-05
DE19947195A1 (en) 2001-04-05
BR0007194B1 (en) 2008-11-18
WO2001025621A1 (en) 2001-04-12
JP2003511610A (en) 2003-03-25
JP4587259B2 (en) 2010-11-24

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