EP1450036B1 - Dosiervorrichtung und Verfahren zur Einstellung der Federvorspannung - Google Patents

Dosiervorrichtung und Verfahren zur Einstellung der Federvorspannung Download PDF

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Publication number
EP1450036B1
EP1450036B1 EP20030003849 EP03003849A EP1450036B1 EP 1450036 B1 EP1450036 B1 EP 1450036B1 EP 20030003849 EP20030003849 EP 20030003849 EP 03003849 A EP03003849 A EP 03003849A EP 1450036 B1 EP1450036 B1 EP 1450036B1
Authority
EP
European Patent Office
Prior art keywords
valve needle
spring
metering device
preload
tooth angle
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 - Fee Related
Application number
EP20030003849
Other languages
English (en)
French (fr)
Other versions
EP1450036A1 (de
Inventor
Gianbattista Fischetti
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.)
Continental Automotive Italy SpA
Original Assignee
Siemens VDO Automotive SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens VDO Automotive SpA filed Critical Siemens VDO Automotive SpA
Priority to DE2003610362 priority Critical patent/DE60310362T2/de
Priority to EP20030003849 priority patent/EP1450036B1/de
Publication of EP1450036A1 publication Critical patent/EP1450036A1/de
Application granted granted Critical
Publication of EP1450036B1 publication Critical patent/EP1450036B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with 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
    • 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
    • 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
    • F02M2200/507—Adjusting spring tension by screwing spring seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow

Definitions

  • the present invention relates to a metering device for dosing pressurized fluids, particularly an injection valve for a fuel injection system in an internal combustion engine.
  • the metering device is of the type which comprises a housing having an end part provided with an outlet passage terminating with a metering opening, an axially moveable valve needle passing through the outlet passage, and controlling opening and closing of the metering opening, the valve needle having a lower portion inside the outlet passage, with a lower end controlling the opening and closing of the metering opening, and having an upper portion with an upper end cooperating with an actuator assembly to displace the needle from the closing position, and further comprises a spring means for urging the valve needle in the closing position.
  • the invention further relates to a method for setting a spring preload in such a metering device.
  • EP 1 106 817 A2 an injection valve is described comprising a spring washer that is secured to the valve needle by welding.
  • the spring is constrained between the spring washer and the housing of the valve.
  • the spring preload can thus be set by welding the spring washer to the appropriate axial location to the valve needle.
  • US 6 260 776 B1 discloses another approach to fix a spring retainer to a valve needle.
  • the spring retainer has a conical bore.
  • a conical shaped keeper located within the bore fixes the spring retainer to the valve needle.
  • a needle of an injection valve comprising a screw thread formation at the upper end.
  • a spring abutment member can be screwed that constrains a spring that biases the valve needle in a closed position.
  • a spring abutment member has a sleeve that is fixed at its axial position on the valve needle by a nut that is screwed onto the screw thread formation at the upper end of the valve needle. The nut is secured to the needle by a pin, a lock nut, a lock screw or a similar technique to avoid undesirable rotation between the nut and the needle.
  • a blocking means formed by a spring washer with a collar is arranged at and crimped to a screwed part of the upper portion of the valve needle to block the spring means in a working position, thereby providing a predetermined spring preload.
  • the screwed part of the valve needle may have a pitch between about 0,1 mm and about 0,5 mm, preferably between about 0,2 mm and about 0,4 mm.
  • the screwed part preferably has a plurality of teeth, each having a lower tooth angle and an upper tooth angle.
  • the lower and upper tooth angle are between about 30° and about 45°. In a particularly preferred embodiment, the lower and upper tooth angle are both about 30°. In another particularly preferred embodiment, the lower tooth angle is about 30° and the upper tooth angle is about 45°, thereby forming a saw tooth shape.
  • the spring washer is advantageously made of stainless steel, preferably it is made of SS 304, SS 316, SS 430 FR or SS 416 P70. Particularly good results have been obtained with washers made of stainless steel 316 or 416 P70.
  • a variable external preload force is applied to a top surface of the spring washer during the assembly process of the metering device, the external preload force is measured, and the collar is crimped to the screwed part at the upper portion of the valve needle to block the spring means in a working position, when a predetermined spring preload is reached.
  • the collar is advantageously crimped to the valve needle using a punch having two parallel sharp teeth as a crimping tool.
  • Figure 1 illustrates an injection valve 10 for direct-injection gasoline engines comprising a housing 12 having an end part provided with an outlet passage 14 terminating with a metering opening (not shown), and an axially moveable valve needle 16 passing through the outlet passage 14.
  • the valve needle 16 has a lower portion inside the outlet passage 14, a lower end of which controls the opening and closing of the metering opening.
  • the upper portion of the valve needle 16 terminates in an upper end 18, which cooperates with an actuator assembly (not shown) to displace the needle 16 from its closing position.
  • the axial length of the actuator assembly increases and this extension is transmitted to the valve needle 16.
  • the valve needle 16 depresses a biasing spring 20 and lifts from its seat to start the injection of pressurized gasoline in the engine cylinder.
  • the length of the actuator assembly decreases to its normal value and the biasing spring 20 pushes the valve needle 16 back in its closing position.
  • Figure 1 shows the injection valve in a partially assembled state during the assembly process.
  • the housing 12, the spring 20 and the blocking means 24, 28 described below are partially cut away for clarity.
  • the upper portion of the valve needle 16 is provided with a screwed part 22.
  • a spring washer 24 is put on the valve needle 16 and brought into contacts with the biasing spring 20.
  • an external preload force 26 is applied to the top surface of the spring washer 24 and the external preload force is measured with a dynamometric device, i.e. a load cell.
  • a threaded keeper nut 28 is screwed on the screwed part 22 of the valve needle 16, blocking the spring washer 24 and the working position of the biasing spring 20. Only a single step is required to apply and measure the preload force.
  • Figure 2 shows cross-sectional views of the spring washer 24 (Fig. 2(a)) and the threaded keeper nut 28 (Fig. 2(b)).
  • FIG. 3 and 4 An embodiment of the invention is illustrated in Figs. 3 and 4.
  • the valve needle 16 is provided with a screwed part 22 having a plurality of teeth 36.
  • a spring washer 32 with a collar 34 made of stainless steel SS 316 is put on the upper part of the valve needle.
  • An external preload force 26 is applied to the top surface of the spring washer 32 and in the same step, the preload force is measured with a load cell.
  • the collar 34 is crimped to the screwed part 22 as indicated by the arrows 38.
  • a punch 40 with two sharp teeth 42 such as shown in Fig. 5 may be used.
  • FIG. 6 illustrates the structure of the screwed part 22 according to a preferred embodiment of the injector valve in detail.
  • Each of the plurality of teeth 36 has a lower tooth angle 44 and an upper tooth angle 46, which are selected to lie between about 30° and about 45°. In the embodiment shown, the lower tooth angle 44 and the upper tooth angle 46 are chosen to be 30°.
  • FIG. 7 is a perspective view of the upper part of a valve needle 16, on which a spring washer 48 is put.
  • the spring washer 48 rests on a helical spring, which is omitted from Fig. 7.
  • An external preload force 26 is applied to the top surface of the spring washer 48 and in the same step, the preload force is measured with a load cell.
  • the spring washer 48 is laser welded to the upper portion of the valve needle 16, thereby blocking the working position of the spring biasing 20.
  • the spring washer may be continuously welded or, preferably, be secured to the valve needle 16 by a plurality, such as 3, 4, 6 or 8 welding spots 50, which are equally spaced along the circumference of the valve needle 16.
  • Figure 8 shows a cross-sectional view of the spring washer 48, and illustrates a raised section 52 on the upper surface, which contains all of the laser welded spots 50.
  • FIG. 9 shows a flowchart illustrating an embodiment of the method in accordance with the invention.
  • the illustrated method starts in step S1.
  • step S2 a variable external preload is applied to the upper surface of the blocking means.
  • the applied preload is measured in step S3.
  • step S4 it is checked whether the predetermined spring preload is reached. If this is not the case, the method returns to step S2 and a different external preload force is applied. If it is determined in step S4 that the predetermined spring preload is reached, the method continues to step S5.
  • step S5 the blocking means are secured to the upper portion of the valve needle to block the spring means in a working position. The securing is done by crimping a collar of the blocking means.
  • the method depicted in figure 9 ends in step S6.

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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)

Claims (8)

  1. Dosiervorrichtung zum Dosieren von unter Druck stehenden Fluiden, insbesondere ein Einspritzventil für ein Kraftstoffeinspritzsystem in einer Brennkraftmaschine, mit
    - einem Gehäuse (12) mit einem Endteil, der mit einem Auslasskanal (14) versehen ist, welcher mit einer Dosieröffnung endet,
    - einer axial beweglichen Ventilnadel (16), die sich durch den Auslasskanal (14) erstreckt und das Öffnen und Schließen der Dosieröffnung steuert,
    wobei die Ventilnadel (16) einen unteren Abschnitt innerhalb des Auslasskanals (14) mit einem unteren Ende, das das Öffnen und Schließen der Dosieröffnung steuert, und einen oberen Abschnitt mit einem oberen Ende (18), der mit einer Betätigungseinheit zusammenwirkt, um die Ventilnadel (16) aus der Schließposition zu verschieben, aufweist, wobei der obere Abschnitt der Ventilnadel (16) einen Schraubteil (22) besitzt, an dem eine Blockiereinrichtung (32) befestigt ist,
    - einer Federeinrichtung (20) zum Drücken der Ventilnadel (16) in die Schließposition, und
    - wobei die Blockiereinrichtung (32) am oberen Abschnitt der Ventilnadel (16) angeordnet und hiermit befestigt ist, um die Federeinrichtung (20) in einer Arbeitsstellung zu blockieren und auf diese Weise eine vorgegebene Federvorspannung vorzusehen,
    dadurch gekennzeichnet, dass
    die Blockiereinrichtung von einer Federscheibe (32) mit einer Manschette (34) gebildet ist, wobei die Manschette (34) mit dem Schraubteil (22) der Ventilnadel (16) verbördelt ist.
  2. Dosiervorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Schraubteil (22) der Ventilnadel (16) eine Ganghöhe zwischen etwa 0,1 mm und etwa 0,5 mm, vorzugsweise zwischen etwa 0,2 mm und etwa 0,4 mm, besitzt.
  3. Dosiervorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Schraubteil (22) der Ventilnadel (16) Zähne (36) mit einem unteren Zahnwinkel (44) und einem oberen Zahnwinkel (46) besitzt, wobei der untere und obere Zahnwinkel zwischen etwa 30° und etwa 45° betragen.
  4. Dosiervorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der untere und obere Zahnwinkel (44, 46) beide etwa 30° betragen.
  5. Dosiervorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der untere Zahnwinkel (44) etwa 30° und der obere Zahnwinkel (46) etwa 45° betragen und auf diese Weise eine Sägezahnform bilden.
  6. Dosiervorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass die Federscheibe (32) aus rostfreiem Stahl, vorzugsweise aus SS 304, SS 316, SS 430 FR oder SS 416 P70, hergestellt ist.
  7. Verfahren zum Einstellen der Federvorspannung in einer Dosiervorrichtung nach einem der vorangehenden Ansprüche, bei dem
    - eine variable externe Vorspannkraft auf die Oberseite von mindestens einem Teil der Blockiereinrichtung (32) während des Montageprozesses der Dosiervorrichtung aufgebracht wird,
    - die externe Vorspannkraft gemessen wird,
    - die Manschette (34) mit der Federscheibe (32) mit dem Schraubteil (22) der Ventilnadel (16) verbördelt wird, um die Federeinrichtung (20) in einer Arbeitsposition zu blockieren, wenn eine vorgegebene Federvorspannung erreicht ist.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Manschette (34) unter Verwendung eines Stanzwerkzeuges mit zwei parallelen scharfen Zähnen (42) als Bördelwerkzeug mit der Ventilnadel (16) verbördelt wird.
EP20030003849 2003-02-20 2003-02-20 Dosiervorrichtung und Verfahren zur Einstellung der Federvorspannung Expired - Fee Related EP1450036B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2003610362 DE60310362T2 (de) 2003-02-20 2003-02-20 Dosiervorrichtung und Verfahren zur Einstellung der Federvorspannung
EP20030003849 EP1450036B1 (de) 2003-02-20 2003-02-20 Dosiervorrichtung und Verfahren zur Einstellung der Federvorspannung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030003849 EP1450036B1 (de) 2003-02-20 2003-02-20 Dosiervorrichtung und Verfahren zur Einstellung der Federvorspannung

Publications (2)

Publication Number Publication Date
EP1450036A1 EP1450036A1 (de) 2004-08-25
EP1450036B1 true EP1450036B1 (de) 2006-12-13

Family

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Application Number Title Priority Date Filing Date
EP20030003849 Expired - Fee Related EP1450036B1 (de) 2003-02-20 2003-02-20 Dosiervorrichtung und Verfahren zur Einstellung der Federvorspannung

Country Status (2)

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EP (1) EP1450036B1 (de)
DE (1) DE60310362T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602006011587D1 (de) * 2006-06-06 2010-02-25 Continental Automotive Gmbh Verfahren zur Einstellung eines Brennstoffeinspritzventils
DE102017209010B3 (de) 2017-05-30 2018-05-30 Continental Automotive Gmbh Verfahren zum Erkennen der Vorspannung einer Kalibrationsfeder eines magnetisch betriebenen Kraftstoffeinspritzventils

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE880822C (de) * 1939-06-07 1953-06-25 Daimler Benz Ag Brennstoffeinspritzventil mit am Ventilsitz verstaerktem Nadelschaft
FR1040381A (fr) * 1951-08-08 1953-10-14 Injecteur pour moteur à explosion
US5207410A (en) * 1992-06-03 1993-05-04 Siemens Automotive L.P. Means for improving the opening response of a solenoid operated fuel valve
GB9811649D0 (en) * 1998-05-29 1998-07-29 Lucas Ind Plc Fuel injector
EP1046809B1 (de) 1999-04-20 2005-08-10 Siemens Aktiengesellschaft Fluiddosiervorrichtung
DE19958705C2 (de) * 1999-12-06 2003-03-13 Siemens Ag Ventil mit verbesserter Anschlaggeometrie
US6260776B1 (en) * 2000-01-12 2001-07-17 Woodward Governor Company Universal gaseous fuel injector cartridge
DE10122353B4 (de) * 2001-05-09 2004-04-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10123218A1 (de) * 2001-05-12 2002-11-14 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten

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Publication number Publication date
EP1450036A1 (de) 2004-08-25
DE60310362D1 (de) 2007-01-25
DE60310362T2 (de) 2007-04-19

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