EP1309793B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1309793B1
EP1309793B1 EP01962595A EP01962595A EP1309793B1 EP 1309793 B1 EP1309793 B1 EP 1309793B1 EP 01962595 A EP01962595 A EP 01962595A EP 01962595 A EP01962595 A EP 01962595A EP 1309793 B1 EP1309793 B1 EP 1309793B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
armature
valve according
face
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
EP01962595A
Other languages
German (de)
English (en)
Other versions
EP1309793A1 (fr
Inventor
Hubert Stier
Guenther Hohl
Norbert Keim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1309793A1 publication Critical patent/EP1309793A1/fr
Application granted granted Critical
Publication of EP1309793B1 publication Critical patent/EP1309793B1/fr
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
    • F02M61/04—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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • 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
    • F02M51/0671—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 having an elongated valve body attached thereto
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a disadvantage of the fuel injector known from the above-mentioned document is in particular the complicated design, which requires a high cost in the manufacture of the components.
  • the closing times can not be optimized by targeted use of acting on the anchor fuel stagnation, whereby the opening times of the fuel injector remain in need of improvement, since for sealing the Fuel injection valve against the combustion chamber pressure, the return spring must have a high closing force.
  • swirl grooves or swirl bores are provided in the area of the metering point.
  • the throttling of the fuel flow in the region of these swirl grooves or swirl holes causes a force component on the valve needle in the closing direction. This can adversely affect the valve behavior.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that on the one hand, the hydraulic forces can be used to shorten the closing time of the fuel injector, as builds up a small back pressure on the anchor by the attached between the armature and pole inner throttle, on the other hand, the bounce is improved during the opening process by the hydraulic forces occurring by damping the anchor stop.
  • the increase in the throttle point on a wedge shape so that hydraulic sticking of the anchor is prevented at the stop.
  • Another advantage is that the holes used for de-throttling in anchor simply at the respective desired location attachable are.
  • the Entdrosselung on the central recess of the armature is particularly easy to carry out, since the central recess must be drilled only in the production of the anchor in a slightly larger diameter.
  • Another advantage is the formation of the increase in the anchor stop surface of the inner pole, since thereby the armature shape does not have to be changed.
  • the attachment of a shoulder on the outflow surface of the inner pole as a throttle point is advantageous because this embodiment is particularly easy to produce.
  • the fuel injection valve 1 is embodied in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is guided.
  • the valve needle 3 is in operative connection with a valve closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1 which has an injection opening 7.
  • the nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are magnetically separated from each other and are based on a connecting member 29.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is of a Surround plastic casing 18, which may be molded on the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped.
  • armature 20 On the other side of the dial 15 is an armature 20. This is frictionally connected via a first flange 21 with the valve needle 3 in connection, which is connected by a weld 22 with the first flange 21.
  • a return spring 23 On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.
  • the armature 20 and the valve seat body 5 are fuel passages 30a to 30c, which conduct the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25, to the ejection opening 7.
  • the fuel injection valve 1 is sealed by a seal 28 against a fuel line, not shown.
  • the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement. Upon energization of the magnetic coil 10, this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, wherein the stroke is determined by a located in the rest position between the inner pole 13 and the armature 20 working gap 27. Of the Armature 20 takes the flange 21, which is welded to the valve needle 3, also in the stroke direction with. The valve closing body 4, which is in operative connection with the valve needle 3, lifts off from the valve seat surface 6 and the fuel guided via the fuel channels 30a to 30c to the injection opening 7 is hosed down.
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the standing with the valve needle 3 in operative connection flange 21 moves against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • Fig. 2 shows a fragmentary sectional view of a first embodiment of a fuel injection valve 1 according to the invention. The section described is designated in Fig. 1 with II.
  • Fig. 2 shows the area around the armature 20, which is supported on the second flange 31 shown in simplified form, when the fuel injection valve 1 is in rest position.
  • the second flange 31 is connected via the weld 33 with the valve needle 3 in operative connection.
  • On the inlet side of the armature 20 is the first flange 21, on which the return spring 23 is supported. Also, the first flange 21 is connected via a weld 22 with the valve needle 3 in operative connection.
  • a slight step-shaped elevation 35 is formed on an inlet-side armature surface 34.
  • the increase 35 extends annularly on the inlet-side anchor surface 34.
  • the strength of the throttling action is dependent, inter alia, on the area 46 enclosed by the increase 35.
  • the throttle effect in one Throttle 36 at the increase 35 amplifies the existing throttle effect, which is caused by a lateral throttle gap 26 on the outer shell side of the armature 20.
  • the increase 35 is shown exaggerated in FIG.
  • the increase 35 is rectangular in cross section or slightly wedged to prevent hydraulic bonding of the armature 20 at the inner pole 13.
  • For the increase 35 are different manufacturing processes such. B. the vapor deposition of a metal layer or the milling of a recess in the inlet-side anchor surface 34 conceivable.
  • the operation of a fuel injection valve 1 with such a throttle point 36 is subject to relatively large fluctuations.
  • the throttling effect is strongly influenced by geometric, hydraulic and thermal parameters, since, for example, the viscosity and thus the flow velocity of the fuel through the temperature to be influenced.
  • the system can assume various operating states. For example, if the hydraulic damping is so strong that the armature 20 does not abut the inner pole 13, the operation is ballistic. This is a dynamic but more desirable, but difficult to control operating condition. If the armature 20 strikes the inner pole 13 with a delay, the opening time of the fuel injection valve 1 is lengthened.
  • a targeted de-throttling of the system can be made.
  • the throttle effect is reduced in particular by drilling in the armature 20 and thus reduces the influence of the hydraulic closing force. With adequate de-throttling, the system goes into non-ballistic operation.
  • FIG. 3A schematically shows, in an excerpted sectional view, a second exemplary embodiment of the fuel injection valve 1 according to the invention.
  • the elevation 35 is not attached to the inlet-side armature surface 34 but to an outlet-side armature stop surface 37 of the inner pole 13. As long as the distance of the throttle body 36 from the valve needle 3 or a surface 46 enclosed by the increase 35 remains the same, the effect of the dynamic pressure does not change.
  • a bore 38 is provided for targeted reduction of the throttle effect.
  • the bore 38 is arranged so that it is within the area enclosed by the annular increase 35 surface, so that the throttling effect is reduced by the smaller amount of fuel flowing through the throttle body 36.
  • FIG. 3B shows, in a similar view to FIG. 3A, a third and fourth exemplary embodiment for targeted de-throttling of the system.
  • the Entschrosselungsdorfddling executed in the previous embodiment as a bore 38 may also be designed as a groove-like expansion of a central recess 39 of the armature 20, as shown in the area left of the valve needle 3 in Fig. 3B.
  • This embodiment has the particular advantage that the Entdrosselungsnut can be made with little effort with the central recess 39 of the armature 20 without further holes 38 must be introduced into the armature 20.
  • the fourth embodiment shown on the right in FIG. 3B is designed in the form of an also groove-like recess 40 in the valve needle 3. Also, this embodiment is characterized by a simple method of preparation, for example, the recess 40 can be introduced by turning or milling in particular with aerodynamically rounded edges 44 in the valve needle 3.
  • Figure 3C shows in a partial sectional view of a fifth and sixth embodiment of the fuel injection valve 1 according to the invention in each case with a so-called stroke Entdrosselung.
  • the armature 20 is designed so that at the inlet-side anchor surface 34 has a recess 41 z. B. in the form of a radially extending groove, which is completed by a marginal increase 42, which extends annularly on an outer edge 45 of the inlet-side anchor surface 34.
  • the throttling action of the throttle point 36 formed between the marginal elevation 42 and a corresponding shoulder 43 of the inner pole 13 is attenuated by an amount dependent on the length of the recess 41.
  • one of the recess 41 facing edge 47 is streamlined bevelled or rounded.
  • a sixth embodiment of the fuel injection valve 1 according to the invention is shown, which also has a stroke Entdrosselung.
  • this embodiment is similar to that described in Fig. 3A, however, the bore 38 is not located within the annular elevation 35, but is moved radially farther outward in the armature 20. This in turn reduces the length of the throttle gap 36.
  • the invention is not limited to the illustrated embodiments and also in a variety of other designs of fuel injection valves realized.

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  • 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 (15)

  1. Injecteur de carburant (1) pour des systèmes d'injection de carburant de moteur à combustion interne, comportant une bobine magnétique (10), un induit (20) alimenté dans une direction de fermeture d'un ressort de rappel (23) et une aiguille de soupape (3), en liaison intime avec l'induit (20), permettant l'actionnement d'un corps de fermeture de soupape (4) qui forme un siège étanche avec la surface de siège de soupape (6), l'induit (20) venant buter contre un pôle interne (13) avec une surface d'induit côté alimentation (34),
    caractérisé en ce que
    sur la surface d'induit côté alimentation (34), il y a un point d'étranglement (36) formé par une élévation annulaire étagée (35) sur la surface d'induit côté alimentation (34) et/ou une face de butée de l'induit côté sortie (37) du pôle interne (13).
  2. Injecteur de carburant selon la revendication 1,
    caractérisée en ce que
    des moyens de débridage (38, 39, 40, 41) sont prévus sur l'induit (20) à proximité du point d'étranglement (36).
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisée en ce que
    l'élévation (35) est cunéiforme ou rectangulaire.
  4. Injecteur de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    l'action d'étranglement du point d'étranglement (36) est réduite par un alésage (38) dans l'induit (20).
  5. Injecteur de carburant selon la revendication 4,
    caractérisée en ce que
    l'alésage (38) débouche à l'intérieur d'une surface (46) enserrée par l'élévation (35).
  6. Injecteur de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    l'action d'étranglement du point d'étranglement (36) est réduite par un évidement central (39) de l'induit (20).
  7. Injecteur de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    l'action d'étranglement du point d'étranglement (36) est réduite par un évidement (40) de l'aiguille de soupape (3).
  8. Injecteur de carburant selon la revendication 6 ou 7,
    caractérisée en ce que
    les évidements (39, 40) sur l'induit (20) et l'aiguille de soupape (3) sont exécutés de manière similaire à une rainure.
  9. Injecteur de carburant selon la revendication 7 ou 8,
    caractérisée en ce que
    l'évidement (40) de l'aiguille de soupape (3) présente des arêtes arrondies ou chanfreinées (44).
  10. Injecteur de carburant selon la revendication 4,
    caractérisée en ce que
    l'alésage (38) est à l'extérieur de la surface (46) enserrée par l'élévation (35).
  11. Injecteur de carburant selon l'une quelconque des revendications 1 à 10,
    caractérisée en ce qu'
    un épaulement (43) se trouve sur la face de butée de l'induit côté sortie (37) du pôle interne (13).
  12. Injecteur de carburant selon la revendication 11,
    caractérisée en ce que
    l'induit (20) présente un creux (41) sur la surface d'induit côté alimentation (34).
  13. Injecteur de carburant selon la revendication 12,
    caractérisée en ce que
    le creux (41) est enserré par une élévation marginale (42).
  14. Injecteur de carburant selon la revendication 13,
    caractérisée en ce que
    l'élévation marginale (42) présente une arête arrondie (47) tournée vers le creux (41).
  15. Injecteur de carburant selon la revendication 14,
    caractérisée en ce que
    le point d'étranglement (36) se trouve entre l'élévation marginale (42) et l'épaulement (43).
EP01962595A 2000-08-10 2001-08-09 Soupape d'injection de carburant Expired - Lifetime EP1309793B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10039083A DE10039083A1 (de) 2000-08-10 2000-08-10 Brennstoffeinspritzventil
DE10039083 2000-08-10
PCT/DE2001/002951 WO2002012711A1 (fr) 2000-08-10 2001-08-09 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1309793A1 EP1309793A1 (fr) 2003-05-14
EP1309793B1 true EP1309793B1 (fr) 2006-01-18

Family

ID=7651999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01962595A Expired - Lifetime EP1309793B1 (fr) 2000-08-10 2001-08-09 Soupape d'injection de carburant

Country Status (8)

Country Link
US (1) US7086614B2 (fr)
EP (1) EP1309793B1 (fr)
JP (1) JP5064638B2 (fr)
KR (1) KR100756204B1 (fr)
CZ (1) CZ298154B6 (fr)
DE (2) DE10039083A1 (fr)
RU (1) RU2271462C2 (fr)
WO (1) WO2002012711A1 (fr)

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JP5994642B2 (ja) * 2013-01-07 2016-09-21 マツダ株式会社 直噴エンジンの燃料噴射装置
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Also Published As

Publication number Publication date
WO2002012711A1 (fr) 2002-02-14
RU2271462C2 (ru) 2006-03-10
KR100756204B1 (ko) 2007-09-07
CZ20021231A3 (cs) 2003-09-17
DE50108761D1 (de) 2006-04-06
CZ298154B6 (cs) 2007-07-11
JP5064638B2 (ja) 2012-10-31
JP2004506129A (ja) 2004-02-26
KR20020037068A (ko) 2002-05-17
DE10039083A1 (de) 2002-02-21
EP1309793A1 (fr) 2003-05-14
US20030047627A1 (en) 2003-03-13
US7086614B2 (en) 2006-08-08

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