EP1045974B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1045974B1
EP1045974B1 EP99948655A EP99948655A EP1045974B1 EP 1045974 B1 EP1045974 B1 EP 1045974B1 EP 99948655 A EP99948655 A EP 99948655A EP 99948655 A EP99948655 A EP 99948655A EP 1045974 B1 EP1045974 B1 EP 1045974B1
Authority
EP
European Patent Office
Prior art keywords
armature
stop
spring
face
fuel injection
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
EP99948655A
Other languages
German (de)
English (en)
Other versions
EP1045974A1 (fr
Inventor
Ferdinand Reiter
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 EP1045974A1 publication Critical patent/EP1045974A1/fr
Application granted granted Critical
Publication of EP1045974B1 publication Critical patent/EP1045974B1/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
    • F02M61/16—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
    • F02M51/0664—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
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means

Definitions

  • the invention is based on a fuel injector according to the genus of the main claim.
  • a fuel injector is already known from US Pat. No. 5,299,776 known according to the preamble of claim 1.
  • the Fuel injector has one with a valve needle connected valve closing body with one on one Valve seat body designed valve seat surface to a Sealing seat interacts.
  • a solenoid provided that cooperates with an anchor attached to the Valve needle between one the movement of the armature in the Stroke direction of the valve needle limiting first stop and one the movement of the armature against the stroke direction limiting second stop is movable. That through the two stops fixed axial movement of the Within certain limits, Ankers decouples the inert mass of the valve needle and the valve closing body on the one hand and the inertial mass of the anchor on the other.
  • the fuel injector according to the invention with the characteristic In contrast, features of the main claim the advantage that the fuel injector is satisfactory Way debounced. Furthermore, there is a high one Long-term stability, because the damping spring against one Elastomer material has a long service life and especially not from the fuel over time is decomposed. Furthermore, the damping spring is compared to an elastomer material can be assembled without any special effort and the damping effect is independent of temperature. Is too a targeted adjustment of the damping properties an appropriate choice of material and shape Damping spring, the angle of attack of the damping spring compared to the stop and the anchor as well as the preload the damping spring possible.
  • the stop is convex and the opposite one
  • the face of the anchor is concave be formed or vice versa
  • the stop can be concave and the opposite end face of the anchor is convex be trained. This creates a gap between the armature and the stop an inclination with respect to the longitudinal axis of the Valve needle, and the damping by the squeezing flow of the Fuel is improved.
  • the concave or convex formation of the stop and the opposite End face of the anchor a disc spring with a flat spring washer that are simple and is inexpensive to manufacture.
  • the level Spring washer can be a conical or disc spring have curved spring washer, which reduces the damping effect is still improved.
  • the damping spring is preferably a plate spring surrounds the valve needle in a ring. Through the disc spring a compact damping component is created, which in the Gap between the anchor and the stop can be integrated can.
  • the assembly of the disc spring is also extreme simple; it is only on before installing the anchor to slide on the valve needle.
  • a disc spring with a conical or arched Spring washer is used.
  • the two spring washers can have one Connecting strap to be connected what the Assembly simplified. Furthermore, the two spring washers then, for example, by punching from a part Metal strips are made.
  • the spring washers can have openings on the one hand have an influence on the spring constant of the spring washers and on the other hand the squeezing flow of the fuel in the Affect the gap between the anchor and the stop.
  • Fig. 1 shows a partially cut representation a first embodiment of an inventive Fuel injector 1.
  • the fuel injector 1 is used to inject fuel in a mixture-compressing, spark ignition internal combustion engine.
  • the illustrated embodiment is a high-pressure injection valve for direct fuel injection, in particular of gasoline, in the combustion chamber of the internal combustion engine.
  • the fuel injector 1 has one in the embodiment integrally connected to a valve needle 2 Valve closing body 3, which with a valve seat body 4 trained valve seat surface into one Sealing seat interacts.
  • the valve seat body 4 is with connected to a tubular valve seat support 5, which in a Location bore of a cylinder head of the internal combustion engine is insertable and against the receiving bore by means of a Seal 6 is sealed.
  • the valve seat support 5 is on its inlet end 7 in a longitudinal bore 8 of a Housing body 9 inserted and against the housing body 9 sealed by means of a sealing ring 10.
  • the inlet side End 7 of the valve seat support 5 is by means of a Threaded ring 11 biased, between a stage 12 of the housing body 9 and an end face 13 of the inlet-side end 7 of the valve seat support 5 a stroke adjusting disc 14 is clamped.
  • the fuel flows through an axial bore 30 Housing body 9 and an axial bore provided in the armature 17 31 as well as in a guide disk 32 provided axial bores 33 in an axial bore 34 of the Valve seat support 5 and from there to the not shown Fuel injector 1 seat.
  • the armature 17 is between the first stop 21 of the first Stop body 20 and one on a second stop body 25 trained second stop 26 movable, the Armature 17 by a contact spring 27 in the rest position the first stop 21 is held in contact so that a gap between the armature 17 and the second stop 26 arises, which is a certain movement play of the armature 17th allowed.
  • the second stop body 25 is by means of a Weld 28 is attached to the valve needle 2.
  • Movement play of the armature 17 is a decoupling of the inert masses of the armature 17 on the one hand and the valve needle 2 and the valve closing body 3 on the other hand.
  • the closing movement of the fuel injector 1 strikes on the valve seat surface, not shown, therefore only the Inert mass of the valve closing body 3 and the valve needle 2 on, the anchor 17 when the Valve closing body 3 on the valve closing surface is not is decelerated abruptly, but towards the second stop 26 moves on.
  • decoupling the The armature 17 from the valve needle 2 is the dynamics of the fuel injector 1 improved. However, it must be ensured be that striking the spray-side End face 29 of the armature 17 on the second stop 26 does not cause valve bouncing. This is through the Measure achieved according to the invention.
  • FIG. 2 is the area marked X in FIG. 1 partially shown enlarged, whereby already described Provide elements with matching reference symbols are to facilitate the assignment.
  • valve needle 2 shows the valve needle 2, which is on the valve needle 2 second stop body welded by means of the weld seam 28 25 with its second stop 26, the anchor 17 with its spray-side, the second stop 26 opposite Face 29 and the in the rest position of the Fuel injector 1 between the spray side End face 29 of the armature 17 and the stop 26 of the second Stop body 25 formed gap 40 recognizable.
  • the armature 17 is a damping spring, which in the present Embodiment as a valve needle 2 annular enclosing plate spring 41 is formed.
  • Fig. 2 is the spray-side end face 29 of the armature 17 conically convex formed while a stop 26 forming End face 42 of the second stop body 25 is conically concave is trained.
  • the end faces 29 and 42 can also be arched convex or concave. there the end face 29 could also be concave if then conversely the end face 42 of the second Stop body 25 is convex.
  • the convex or concave design of the end faces 29 and 42 enables a plate spring 41 with a flat spring washer 43 use.
  • the damping spring 41 dampens the stop of the armature 17 on the second stop 26, so that the armature 17 on the second stop 26 relatively soft and cushioned strikes.
  • the damping effect is based on one hand elastic deformation of the plate spring 41; on the other hand in the idle state of the fuel injector 1 in the gap 40 displaced fuel displaced from the gap 40, so that a squeezing flow of the fuel arises, too dampens the armature movement.
  • the contact spring can, if necessary 27 omitted.
  • Fig. 3 also shows that marked X in Fig. 1 Section of the fuel injector 1, however, accordingly a second, alternative embodiment.
  • the plate spring 41 not only the flat spring washer 43, but also from a conical spring washer 44. Both spring washers 43 and 44 surround the valve needle 2.
  • the second Spring washer 44 could also be curved.
  • a convex side 45 of the conical or curved spring washer 44 faces the convex end face 29 of the armature 17.
  • the end face 42 of the second stop body 25 instead the end face 29 of the armature 17 is convex, that would be the conical or curved spring washer 44 accordingly this convex end face 42 of the second stop body 25 facing.
  • Fig. 4 shows the section marked X in Fig. 1 of fuel injector 1 according to an alternative third embodiment.
  • FIG. 4 The example shown in Fig. 4 is both the spray-side, the second stop body 25 opposite end face 29 of the armature 17 as well as the end face 42 of the second, opposite armature 17 Stop body 25 formed flat, which is manufacturing technology is easier to implement.
  • a spring washer is corresponding 45 of the plate spring 41 is conical or curved, so that the spring washer 45 with the end face 25th the armature 17 comes into engagement before the armature 17 to the second stop 26 strikes.
  • FIG. 5 shows the area marked X in FIG. 1 in FIG corresponding to an enlarged, excerpt a fourth alternative example.
  • the Difference to that shown in Fig. 4 Example is that the plate spring 41st not just from a first conical or arched one Spring washer 45 but also from a second conical or arched spring washer 47.
  • the one in Fig. 6 is on the left fifth example shown the two conical or arched spring washers 46 and 47 axially arranged so that convex sides 50 and 51 of the spring washers 46 and 47 are facing each other.
  • the one shown in Fig. 6 on the right side sixth example is another Difference to that shown in Fig. 5 Example in that the two spring washers 46 and 47 to one another by means of a connecting strap 52 are connected. This facilitates the assembly of the disc spring 41. Furthermore, the two spring washers 46 and 47 can then also in one piece from a sheet metal strip, for example Stamping are produced, two of which are the spring washers 46 and 47 rings are punched out, which by a the connecting tab 52 forming web are connected.
  • the plate spring 41 preferably consists of one rusting spring material, for example an iron and / or Copper alloy. About the thickness and the Angle of attack of the spring washers 43, 44, 46, 47 can Damping characteristics of the plate spring 41 targeted can be set. The damping characteristic can also by provided in the spring washers 43, 44, 46, 47 Openings are changed. These openings have at the same time an influence on the cross flow of the from the gap 40 displaced fuel, so that this is also a Variation of the damping characteristic results.
  • the disc spring 41 is with a defined bias between the Anchor 17 and the second stop body 25 mounted.

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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 (8)

  1. Injecteur de carburant (1) pour des installations d'injection de carburant de moteurs à combustion interne, comprenant une bobine d'électro-aimant (15), un induit (17) pouvant être actionné par la bobine d'électro-aimant (15) dans un sens de levée vers un ressort de rappel (23), et une aiguille (2) en liaison avec un obturateur de soupape (3), l'induit (17) pouvant se déplacer entre une première butée (21) en liaison avec l'aiguille (2) et limitant le déplacement de l'induit (17) dans le sens de levée, et une deuxième butée (26) en liaison avec l'aiguille (2) et limitant le déplacement de l'induit ( 17) dans le sens opposé à la levée, avec un ressort amortisseur (41) monté entre la deuxième butée (26) et l'induit (17),
    caractérisé en ce que
    la deuxième butée (26) est formée par la partie frontale (42) d'un corps de butée (25) placée en vis-à-vis de l'induit (17), et une partie frontale (29) de l'induit (17), placée en vis-à-vis de la deuxième butée (26), présente une forme convexe, la partie frontale (42) du corps de butée (25), placée en vis-à-vis de l'induit (17), ayant une forme concave, ou la partie frontale (29) de l'induit (17), placée en vis-à-vis de la deuxième butée (26) présente une forme concave, la partie frontale (42) du corps de butée (25), placée en vis-à-vis de l'induit (17) ayant une forme convexe.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le ressort amortisseur est fourni par une rondelle Belleville (41) qui encercle l'aiguille (2).
  3. Injecteur de carburant selon la revendication 2,
    caractérisé en ce que
    la rondelle Belleville (41) entoure une rondelle élastique plate (43).
  4. Injecteur de carburant selon l'une quelconque des revendications 2 ou 3,
    caractérisé en ce que
    la rondelle Belleville (41) présente une rondelle élastique conique ou bombée (44), la face convexe (45) de la rondelle élastique conique ou bombée (44) étant tournée vers la partie frontale convexe (29, 42) de l'induit (17) ou du corps de butée (25).
  5. Injecteur de carburant selon l'une quelconque des revendications 3 ou 4,
    caractérisé en ce que
    la rondelle élastique (43) ou les rondelles élastiques (43, 44) présentent des ouvertures.
  6. Injecteur de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce qu'
    un autre ressort amortisseur est placé entre la première butée (21) et l'induit (17).
  7. Injecteur de carburant selon la revendication 2,
    caractérisé en ce que
    la rondelle Belleville (41) est élaborée dans une matière insensible à la corrosion.
  8. Injecteur de carburant selon la revendication 7,
    caractérisé en ce que
    cette matière est fournie par un alliage de fer et/ou de cuivre.
EP99948655A 1998-10-26 1999-07-20 Soupape d'injection de carburant Expired - Lifetime EP1045974B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19849210 1998-10-26
DE19849210A DE19849210A1 (de) 1998-10-26 1998-10-26 Brennstoffeinspritzventil
PCT/DE1999/002229 WO2000025018A1 (fr) 1998-10-26 1999-07-20 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1045974A1 EP1045974A1 (fr) 2000-10-25
EP1045974B1 true EP1045974B1 (fr) 2003-11-26

Family

ID=7885608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99948655A Expired - Lifetime EP1045974B1 (fr) 1998-10-26 1999-07-20 Soupape d'injection de carburant

Country Status (7)

Country Link
US (1) US6367769B1 (fr)
EP (1) EP1045974B1 (fr)
JP (1) JP2002528672A (fr)
KR (1) KR20010033464A (fr)
CZ (1) CZ294046B6 (fr)
DE (2) DE19849210A1 (fr)
WO (1) WO2000025018A1 (fr)

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US6367769B1 (en) 2002-04-09
EP1045974A1 (fr) 2000-10-25
JP2002528672A (ja) 2002-09-03
KR20010033464A (ko) 2001-04-25
WO2000025018A1 (fr) 2000-05-04
DE59907862D1 (de) 2004-01-08
CZ20002388A3 (cs) 2001-03-14
DE19849210A1 (de) 2000-04-27
CZ294046B6 (cs) 2004-09-15

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