EP1460263B1 - Einspritzventil mit einer durch eine Feder vorgespannten Nadel - Google Patents

Einspritzventil mit einer durch eine Feder vorgespannten Nadel Download PDF

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Publication number
EP1460263B1
EP1460263B1 EP20030006304 EP03006304A EP1460263B1 EP 1460263 B1 EP1460263 B1 EP 1460263B1 EP 20030006304 EP20030006304 EP 20030006304 EP 03006304 A EP03006304 A EP 03006304A EP 1460263 B1 EP1460263 B1 EP 1460263B1
Authority
EP
European Patent Office
Prior art keywords
needle
valve seat
spring
sleeve
armature
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
EP20030006304
Other languages
English (en)
French (fr)
Other versions
EP1460263A1 (de
Inventor
Mauro Grandi
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.)
Aumovio Germany GmbH
Original Assignee
Continental Automotive Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Priority to EP20030006304 priority Critical patent/EP1460263B1/de
Priority to DE60328355T priority patent/DE60328355D1/de
Publication of EP1460263A1 publication Critical patent/EP1460263A1/de
Application granted granted Critical
Publication of EP1460263B1 publication Critical patent/EP1460263B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other

Definitions

  • the invention describes an injection valve according to the preamble of claim 1.
  • Modern injection valves have a very dynamic closing and opening function. This is necessary for attaining a precise starting point of the injection and a precise ending point of the injection.
  • the fast opening and closing function results in a high speed of the closing member that pushes against a valve seat for closing the valve.
  • high forces are necessary which are induced in the valve seat and in the sealing faces of the needle. The high forces cause a relatively high abrasion on the sealing face and on the valve seat.
  • the state of art proposes an anti-bounce disc, which reduces the needle speed when approaching the valve seat.
  • the anti-bounce disc however, has the disadvantage that it is within the hydraulic flow path of the injected fuel and causes a hydraulic resistance to the fuel.
  • valve seat made of an elastomere to attain a soft impact of the needle on the valve seat.
  • DE 100 65 528 A1 describes an injection valve with a hollow needle and an armature that is arranged at the upper part of the needle and held in place by a pin.
  • the pin allows the needle to move a short distance inside the armature in axial direction thus providing a pre-lift gap.
  • a spring that is fixed to the upper end of and arranged inside the needle pushes against the pin and thus keeps the pre-lift gap open in the closed valve state.
  • US 5 088 467 A discloses an injection valve comprising an armature with a guide tube. Inside the guide tube a spring is arranged. At the lower end of the guide tube a needle is movably arranged in the guide tube. The needle is pushed in the direction of the valve seat by the spring.
  • an injection valve according to claim 1.
  • One advantage of the inventive injection valve is that the needle can be slided in a holding element and between the holding element and the needle a damping spring is arranged. The needle slides against the tension of the damping spring when the needle is pushed onto the valve seat. Therefore the force with which the needle is pushed onto the valve seat is reduced because only the mass of the needle is pushed onto the valve seat and not the mass of the holding element. Furthermore the tension of the damping spring afterwards holds the needle on the valve seat in a closed position. The needle does not lift off the valve seat in the closed position.
  • the holding element is shaped as a sleeve and the needle is guided within the sleeve.
  • the spring is arranged between a wall of the sleeve and the needle, biasing the needle in direction of the valve seat.
  • the shape of the sleeve has the advantage that the needle can be guided precisely along a longitudinal axis of the injection valve and it is enough space for providing a relatively strong spring.
  • the sleeve is realized as a stepped sleeve with two different diameters.
  • the needle is guided in the region with the smaller diameter.
  • a rim of the needle is arranged in the region with the greater diameter.
  • the rim of the needle has a greater diameter than the smaller diameter of the sleeve and the spring is arranged between the rim of the needle and an opposite side wall of the sleeve.
  • Fig. 1 shows a longitudinal view of a fuel injector 1 used in a motor vehicle engine.
  • the fuel injector is basically symmetrical to a central symmetry axis.
  • the injection valve 1 includes a valve body 2. Inside the valve body 2, an orifice plate 3 is arranged adjacent to a lower end of the valve body 2. The orifice plate 3 includes an orifice 4 in a central position. The orifice in the orifice plate 3 provides fluid communication between the fuel injector 1 and a combustion chamber of a motor vehicle engine. In the orifice plate 3 a metallic valve seat 5 is provided. At an inner side of the orifice plate 3, the valve seat 5 surrounds the orifice 4, the purpose of which will be described below.
  • the valve body 2 also houses a needle assembly.
  • the needle assembly comprises an armature 7 that is connected by a needle 6 with a closing member 8.
  • the closing member 8 is a tip of the needle 6 that is dedicated to the valve seat 5.
  • the armature 7 can be moved within the valve body 2 along a longitudinal axis of the fuel injector 1. Depending on the position of the armature 7, the closing member 8 is in a closed position biased against the valve seat 5, closing the orifice 4 preventing a fuel injection. In an opening position, the needle 6 is lift off the valve seat 5.
  • the armature 7 is shaped as a sleeve with an upper end ring face 9 and a central bore 10.
  • the closing member 8 is appropriately sized to be received in the valve seat 5.
  • the needle 6 and the valve seat 5 operate as a fuel valve that selectively opens and closes the injected valve 1.
  • the valve body 2 houses an inlet tube 18.
  • the inlet tube 18 is typically made from metal and includes a lower end ring face 13.
  • the end ring face 13 is adjacent to the upper end ring face 9 of the armature 7.
  • the inlet tube 18 also includes a bore that houses an adjustment sleeve 14 and a portion of a spring 15.
  • the spring 15 is constrained between the lower end of the adjustment sleeve 14 and a seat inside the bore 10 of the armature 7.
  • the adjustment sleeve 14 is adjustably fixed relative to the inlet tube 18 and biases the spring 15 against the seat in the armature bore 10, thereby biasing the needle 6 into a first position, wherein the closing member 8 rests in the valve seat 5 and blocks fluid communication between the fuel injector 1 and the combustion chamber.
  • the upper end ring face 9 of the armature 7 is arranged at a distance from the lower end ring face 13 of the inlet tube 18 creating a gap of approximately 20 microns between the armature 7 and
  • the injection valve 1 further includes an electromagnetic coil assembly 16 that encircles a portion of the inlet tube 18 and is housed within a metallic housing 17.
  • the electromagnetic coil assembly 16 can be selectively charged to create a magnetic field that attracts the armature 7 towards the lower end ring face 13 of the inlet tube 18 into a second position.
  • the biasing force of the spring 15 is overcome in such a way that the closing member 8 is raised from the valve seat 5, allowing fuel to flow through the orifice of the orifice plate 3 into the combustion chamber.
  • the upper end ring face 9 of the armature 7 contacts the lower end ring face 13 of the inlet tube 18.
  • the needle 6 remains in the open position until the charge is removed from the electromagnetic coil assembly 16 at which point the spring 15 biases the valve member 6 back into the first position.
  • a fuel passage way 20 leads through the fuel filter 19, the bore of the adjustment sleeve 14, the inlet tube 18, the bore of the armature 7 and holes 11 of the holding element to an injection chamber 28 that is arranged between the valve body 2 and the needle 6.
  • the electromagnetic coil assembly 16 is selectively charged via an external power lead that applies electricity to the electromagnetic coil assembly 16.
  • the power lead is connected to the coil assembly 16 via a connector terminal 21 that is mounted on an outer surface of the inlet tube 18 via a clip portion.
  • the connector terminal 21 is electrically connected, via soldering or any other suitable method, to terminals of the coil assembly 16.
  • the fuel injector 1 also includes a second housing 22 that surrounds portions with the inlet tube 18, clip connector 21, metallic housing 17 and valve body 2.
  • the second housing 22 is preferably plastic and is preferably molded over the injection valve 1.
  • Figure 2 depicts in greater detail a sectional view of the lower part of the fuel injection valve of Figure 1 .
  • the spring 15 is biased against a rim 35 that is arranged at the lower end of the sleeve part of the armature 7.
  • a second sleeve 32 is fixed to the sleeve part of the armature 7.
  • the second sleeve 32 extends into a third sleeve 33.
  • the diameter of the second sleeve 32 is larger than the diameter of the third sleeve 33.
  • the needle 6 is guided by the third sleeve 33 and extends in the second sleeve 32 with a plate 34.
  • the plate 34 has the shape of a circular plate, the diameter of which is larger than the diameter of the third sleeve 33 and smaller than the diameter of the second sleeve 32.
  • a second spring 36 is arranged between the plate 34 and the rim 35 of the armature 7 .
  • the second spring 36 biases the needle 6 towards the valve seat 5.
  • a fuel chamber 28 is arranged that is connected with the fuel passage way.
  • the second sleeve 32 comprises the holes 11 and provides a fluid connection between the fuel chamber 28 and the inlet tube 18.
  • the bore 10 of the armature 7 is connected with the inner region second sleeve 32, in which the second spring 36 is arranged.
  • the armature 7 is pulled towards the lower end ring face 13 of the support tube 12. If the injection is completed, the coil assembly 16 is deenergized and the armature 7 is biased down in direction of the valve seat 5 by the spring 15 to close the orifice 4. The needle 6 is also moved to the valve seat 5. At the end of the closing travel, the needle 6 contacts the valve seat 5 with its sealing face. The contact between the needle 6 and the valve seat 6 generates a bouncing effect that the invention intends to eliminate.
  • the invention provides a non-rigid link between the armature 7 and the needle 6. The link is established by a slideable guiding connection between the armature 7 and the needle 6 and the second spring 36 that is arranged between the armature 7 and the needle 6.

Landscapes

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

Claims (1)

  1. Einspritzventil (1), umfassend:
    ein Gehäuse (2),
    eine Kraftstoffkammer (28) mit einem Einlass zu der Kraftstoffkammer,
    eine Öffnung (4) mit einem Ventilsitz (5),
    ein bewegbar innerhalb des Gehäuses (2) angeordnetes Halteelement (7, 32, 33), wodurch das Halteelement (7, 32, 33) mit einer Nadel (6) verbunden ist, wodurch eine Spitze der Nadel (6) innerhalb der Kraftstoffkammer angeordnet ist und eine Dichtfläche umfasst, die dem Ventilsitz (5) zugeordnet ist, während das Halteelement (7, 32, 33) eine Hülse (33) umfasst und die Nadel (6) innerhalb der Hülse (33) geführt ist,
    ein Stellglied, das die Position des Halteelements (7, 32, 33) steuert,
    eine zwischen dem Gehäuse (2) und dem Halteelement (7, 32, 33) angeordnete Feder (15), die das Halteelement (7, 32, 33) und die Nadel (6) gegen den Ventilsitz (5) vorspannt,
    eine zweite Feder (36), die zwischen einer Endfläche der Nadel (6) und einer Haltefläche des Halteelements (7, 32, 33) angeordnet ist, während die Nadel (6) bewegbar in einer Bewegungsrichtung der Nadel (6) in dem Halteelement (7, 32, 33) geführt und in Richtung des Ventilssitzes (5) durch die zweite Feder (36) vorgespannt ist,
    dadurch gekennzeichnet, dass die Hülse einen ersten und einen zweiten Abschnitt (32, 33) aufweist, wobei ein erster Abschnitt (32) einen größeren Durchmesser als ein zweiter Abschnitt (33) aufweist, während an einem Ende des ersten Abschnitts die Haltefläche angeordnet ist, wobei das andere Ende des ersten Abschnitts (32) sich mit dem zweiten Abschnitt (33) verändert, während der zweite Abschnitt (33) eine Führung für die Nadel (6) darstellt, wobei das in dem ersten Abschnitt (32) angeordnete Ende der Nadel (6) eine Platte mit einem Durchmesser umfasst, der größer ist als der zweite Abschnitt.
EP20030006304 2003-03-19 2003-03-19 Einspritzventil mit einer durch eine Feder vorgespannten Nadel Expired - Lifetime EP1460263B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20030006304 EP1460263B1 (de) 2003-03-19 2003-03-19 Einspritzventil mit einer durch eine Feder vorgespannten Nadel
DE60328355T DE60328355D1 (de) 2003-03-19 2003-03-19 Einspritzventil mit einer durch eine Feder vorgespannten Nadel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030006304 EP1460263B1 (de) 2003-03-19 2003-03-19 Einspritzventil mit einer durch eine Feder vorgespannten Nadel

Publications (2)

Publication Number Publication Date
EP1460263A1 EP1460263A1 (de) 2004-09-22
EP1460263B1 true EP1460263B1 (de) 2009-07-15

Family

ID=32798844

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EP20030006304 Expired - Lifetime EP1460263B1 (de) 2003-03-19 2003-03-19 Einspritzventil mit einer durch eine Feder vorgespannten Nadel

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EP (1) EP1460263B1 (de)
DE (1) DE60328355D1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004024533A1 (de) 2004-05-18 2005-12-15 Robert Bosch Gmbh Brennstoffeinspritzventil
JP2007247429A (ja) * 2006-03-14 2007-09-27 Nikki Co Ltd 燃料噴射弁
EP2527637B1 (de) * 2011-05-23 2014-10-08 Continental Automotive GmbH Injektor zum Einspritzen von Flüssigkeit
EP2535552B1 (de) * 2011-06-15 2015-02-25 Continental Automotive GmbH Ventilanordnung für ein Einspritzventil und Einspritzventil
EP2771562B1 (de) * 2011-10-26 2019-09-18 CPT Group GmbH Ventilanordnung für ein einspritzventil und einspritzventil
EP2597296B1 (de) * 2011-11-23 2014-10-29 Continental Automotive GmbH Ventilanordnung für ein Einspritzventil und Einspritzventil
DE102012210415A1 (de) * 2012-06-20 2013-12-24 Robert Bosch Gmbh Einspritzventil
DE102012210424A1 (de) 2012-06-20 2013-12-24 Robert Bosch Gmbh Einspritzventil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5088467A (en) * 1984-03-05 1992-02-18 Coltec Industries Inc Electromagnetic injection valve
US5114077A (en) * 1990-12-12 1992-05-19 Siemens Automotive L.P. Fuel injector end cap
IT1289794B1 (it) * 1996-12-23 1998-10-16 Elasis Sistema Ricerca Fiat Perfezionamenti ad una valvola di dosaggio a comando elettromagnetico per un iniettore di combustibile.
DE19849210A1 (de) * 1998-10-26 2000-04-27 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19927900A1 (de) * 1999-06-18 2000-12-21 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10065528A1 (de) * 2000-12-28 2002-07-04 Bosch Gmbh Robert Brennstoffeinspritzventil

Also Published As

Publication number Publication date
EP1460263A1 (de) 2004-09-22
DE60328355D1 (de) 2009-08-27

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