EP0126947B1 - Injecteur de carburant pour moteur à combustion interne - Google Patents

Injecteur de carburant pour moteur à combustion interne Download PDF

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Publication number
EP0126947B1
EP0126947B1 EP84104321A EP84104321A EP0126947B1 EP 0126947 B1 EP0126947 B1 EP 0126947B1 EP 84104321 A EP84104321 A EP 84104321A EP 84104321 A EP84104321 A EP 84104321A EP 0126947 B1 EP0126947 B1 EP 0126947B1
Authority
EP
European Patent Office
Prior art keywords
cap
shoulder
valve needle
injection nozzle
fuel
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
Application number
EP84104321A
Other languages
German (de)
English (en)
Other versions
EP0126947A3 (en
EP0126947A2 (fr
Inventor
Dietrich Dipl.-Ing. Trachte
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 EP0126947A2 publication Critical patent/EP0126947A2/fr
Publication of EP0126947A3 publication Critical patent/EP0126947A3/de
Application granted granted Critical
Publication of EP0126947B1 publication Critical patent/EP0126947B1/fr
Expired 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
    • 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 invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • Injection nozzles of this type are the subject of EP-A-0 084 662 published on 3.8.1983, which claims the priorities of 26.1.1982 and 29.5.1982 and therefore belongs to the state of the art according to Art. 54 (3) of the EPC.
  • the opening movement of the valve needle after the undamped advance stroke is delayed or damped by the fact that the fuel can only flow throttled into the expanding damping space.
  • the undamped pre-stroke is achieved in that the cap enclosing the damping chamber rests in the closed position of the valve needle on the end face of the piston-like extension of the valve needle and the length of the extension is dimensioned such that the cap is at a distance from the associated one that corresponds to the undamped pre-stroke locking shoulder fixed to the housing is removed.
  • the cap can initially follow the valve needle unhindered until it strikes the locking shoulder.
  • This arrangement is very simple and may also be done without additional parts.
  • the distance of the cap from the locking shoulder fixed to the housing in the closed position of the valve needle is influenced by a large number of dimensional tolerances, so that exact compliance with the setpoint value of the undamped forward stroke requires very high manufacturing accuracy of several parts or additional adjustment measures.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the desired length of the undamped forward stroke can be exactly maintained with simple means that can be attached already when the injection nozzle is being assembled.
  • the actual length of the forward stroke is only determined by the dimensional tolerances between the support shoulders on the spacer body and between the counter shoulder and the front edge shoulder of the cap.
  • the spacer body is designed as a ring with two differently sized diameter sections, at the transition of which the support shoulder assigned to the counter shoulder of the cap is formed.
  • the larger diameter section of the ring can advantageously overlap an edge flange of the cap and be provided with a plurality of edge notches, between which individual support tabs are formed.
  • the cap can be formed without an edge flange or another circumferential shoulder if, according to a further proposal of the invention, the spacer body is a sleeve provided with a bottom, the depth of which is greater than the length of the cap by the undamped advance stroke.
  • FIG. 1 shows an injection nozzle according to the first embodiment in longitudinal section
  • FIG. 2 enlarges several individual parts of FIG. 1
  • FIG. 3 shows the second embodiment in a representation corresponding to FIG. 2.
  • the injection nozzle according to FIG. 1 has a nozzle body 10 which is clamped to a nozzle holder 14 by a union nut 12.
  • a sleeve 16 Arranged between the nozzle body 10 and the nozzle holder 14 is a sleeve 16 which has an inwardly directed collar 18 which divides a chamber 20 from a chamber 22 of larger diameter in the interior of the injection nozzle.
  • a valve seat 24 is formed in the nozzle body 10 and a valve needle 26 is displaceably mounted, the sealing cone 27 of which is pressed against the valve seat 24 by a closing spring 28.
  • the closing spring 28 is supported on the nozzle body 10 and engages via a flange part 30 on a support disk 32, which in turn is supported on a shoulder 34 of the valve needle 26.
  • an inlet bore 36 is formed, which opens into the chamber 20, which is connected to the chamber 22 via an opening 38 surrounded by the collar 18. From this, a bore 40 in the nozzle body 10 leads into an annular space 42 which is formed between the central bore wall of the nozzle body 10 and the circumference of a section 44 of the valve needle 26 with a reduced diameter and extends directly up to the valve seat 24. There is a distance hg between the flange part 30 and the nozzle body 10 in the illustrated closed position, which corresponds to the total stroke of the valve needle 26.
  • the valve needle 26 is displaced outward in the opening direction by the fuel pressure against the closing spring 28 until the flange part 30 strikes the nozzle body 10. When the valve closes, the closing spring 28 returns the valve needle 26 inward to the closed position shown.
  • a piston-shaped extension 46 adjoins the shoulder 34 of the valve needle 26, which extends through the opening 38 and projects into the chamber 20.
  • the diameter of the extension 46 suitably corresponds to the guide diameter of the valve needle 26.
  • a cap 48 is placed on the extension 46, which has a bottom 50, has a jacket part 52 and a flange edge 54 provided with a plurality of radial slots 53 (FIG. 2).
  • a damping chamber 55 is formed in the cap 48 between the end face of the projection 46 and the base 50, which is connected to the flow path of the fuel in a throttled manner via the radial play between the projection 46 and the jacket part 52 of the cap 48.
  • a spacer ring 56 is pushed onto the jacket part 52 and is provided with an annular flange 58, on the outer circumference of which three axially directed support tabs 60 are formed, which extend over the flange edge 54 of the cap 48 and are evenly distributed.
  • a return spring 62 for the cap 48 engages the ring flange 58 and presses the spacer ring 56 with its support tab 60 against the collar 18 of the sleeve 16.
  • the spacer ring 56 has two support shoulders 64 and 66 which are offset from one another in the axial direction, one of which, 64, is formed by the lower side face of the ring flange 58 and the other, 66, by the end faces of the support tab 60 lying in a common plane is.
  • the support shoulder 64 is assigned to a counter shoulder 68 on the cap 48, which is formed by the upper ring surface of the flange edge 54.
  • the lower side surface of the flange rim 54 forms a front edge shoulder 70 which is assigned to the collar 18 serving as a locking shoulder fixed to the housing.
  • the axial distance between the support shoulders 64, 66 corresponds to the sum of the height of the flange edge 54 and the length of an undamped forward stroke h v .
  • the return spring 62 has placed the spacer ring 56 on the collar 18 and, displacing fuel from the damping space 55, has pushed the cap 48 against the collar 18 to such an extent that between the front edge shoulder 70 of the cap 48 and the collar 18 a gap corresponding to the undamped preliminary stroke h v remains. Due to the increasing fuel pressure at the beginning of an injection process, the valve needle 26 together with extension 46 and cap 48 are initially moved together by the forward stroke h v , the volume of the damping space remaining virtually unchanged and the valve needle movement taking place virtually undamped.
  • the cap 48 comes to rest on the collar 18, which prevents the cap 48 from moving further with the valve needle 26.
  • the fuel can reach the opening 38 practically unthrottled between the support tabs 60 and through the slots 53 in the cap 48 and from there to the valve seat 24 as described.
  • the cap 48 is centered on the valve needle 26 and has a sufficiently large radial play with respect to the nozzle holder 14 so that the valve needle 26 can work without jamming.
  • the return spring 62 for the cap 48 extends partially over the cap 48, so that in this embodiment the means for partially damping the opening stroke of the valve needle 26 take up little space in the axial direction of the injection nozzle.
  • a pre-jet can be formed which practically delivers a constant injection quantity from the start of injection. With appropriately hard damping, a pronounced transition from the pre-jet to the main jet can be achieved.
  • the arrangement described can also be used expediently in the case of those injection nozzles in which the damping is canceled again before the valve needle stroke has ended and as a result a main jet which is clearly separated in terms of quantity and intensity from a pilot jet is generated.
  • an undamped forward stroke of the valve needle can expediently be provided to prevent the valve needle from creeping open.
  • the feed is only determined by the assignment of two parts and is also not influenced when the position of the collar 18 changes, which e.g. can result from an incorrect tightening torque of the union nut 12, plastic or elastic deformation of the nozzle holder 14 and the sleeve 16 or through other manufacturing tolerances.
  • a valve needle 26 ' is provided with a piston-like extension 46' which is weakened in diameter and onto which a cap 48 'is attached, which has a smooth-cylindrical jacket part 52'.
  • the spacer body here is a sleeve 56 'which is plugged onto the cap 48', the base 80 of which forms a support shoulder 64 'which cooperates with the base 50' of the cap 48 'which acts as a counter shoulder 68'.
  • the sleeve 56 ' has a flange edge 82, on which the return spring 62' engages and which forms the second support shoulder 66 ', which is assigned to the housing-fixed collar 18'.
  • This is provided with a plurality of local recesses 84 distributed over the circumference, through which the Fuel can reach valve seat 24 without hindrance.
  • the damping space 55' formed between the cap 48 'and the shoulder 46' has its smallest volume and the front edge shoulder 70 'of the cap 48' facing the collar 18 'is removed from the collar 18' by the amount h v .
  • the cap 48' comes into contact with the collar 18 'after the undamped preliminary stroke h v , after which the further opening movement of the valve needle 26' takes place in a damped manner, as in the exemplary embodiment described above.

Claims (5)

1. Buse d'injection de carburant, pour des moteurs à combustion interne, avec un pointeau de soupape (26) chargé par un ressort de fermeture et s'ouvrant dans le sens d'écoulement du carburant, qui est relié à un piston (46), dont le côté frontal situé en amont de l'écoulement délimite une enceinte d'amortissement (55) remplie de carburant, qui, lors de la course d'ouverture du pointeau de soupape (26) n'est reliée avec le trajet d'écoulement du carburant, que par un canal de laminage et est formé dans un capuchon engagé sur le piston (46), qui est soumis à l'action d'un ressort de rappel (62), dans le sens d'ouverture du pointeau de soupape (26), après une course initiale non amortie du piston (46), qui vient en appui avec un épaulement de barrage (18) du carter et qui reste ensuite en retrait, par rapport au piston (46) qui continue de se déplacer en agrandissant l'enceinte d'amortissement (55), caractérisé en ce que le ressort de rappel (62) engrène sur un corps d'espacement (56) engagé sur le capuchon et guidé de manière mobile sur celui-ci, qui est pourvu de deux corps d'espacement (56) décalés axialement l'un par rapport à l'autre (64, 66), auxquels sont attribués, à l'un un contre-épaulement (68) sur le capuchon (48) et à l'autre l'épaulement de barrage (18) du carter et qui sont à un intervalle axial entre-eux, qui est plus grand de la valeur de la longueur (hv) de la course initiale, que l'intervalle axial du contre-épaulement (68) du capuchon (48) d'avec son épaulement de bordure frontale (70).
2. Buse d'injection selon la revendication 1, caractérisée en ce que le corps d'espacement (56) est une bague avec deux sections de diamètres de grandeur différente, à la transition desquels est formé l'épaulement d'appui (64) à qui est attribué le contre-épaulement (68) du capuchon (48).
3. Buse d'injection selon la revendication 2, caractérisée en ce que la section de grand diamètre de la bague (56) recouvre une bordure bridée (54) du capuchon (48).
4. Buse d'injection selon la revendication 2 ou 3, caractérisée en ce que la section de grand diamètre de la bague (56) est pourvue d'entailles de bordure, entre lesquelles sont formées de languettes d'appui (60) individuelles.
5. Buse d'injection selon la revendication 1, caractérisée en ce que le corps d'espacement est une douille (56') pourvue d'un fond (80), dont la profondeur est plus grande que la longueur du capuchon (48'), autour de la valeur de la course initiale non amortie (hv).
EP84104321A 1983-05-25 1984-04-17 Injecteur de carburant pour moteur à combustion interne Expired EP0126947B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3318887 1983-05-25
DE19833318887 DE3318887A1 (de) 1983-05-25 1983-05-25 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (3)

Publication Number Publication Date
EP0126947A2 EP0126947A2 (fr) 1984-12-05
EP0126947A3 EP0126947A3 (en) 1986-01-22
EP0126947B1 true EP0126947B1 (fr) 1988-07-13

Family

ID=6199789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104321A Expired EP0126947B1 (fr) 1983-05-25 1984-04-17 Injecteur de carburant pour moteur à combustion interne

Country Status (4)

Country Link
US (1) US4580728A (fr)
EP (1) EP0126947B1 (fr)
JP (1) JPS59224465A (fr)
DE (2) DE3318887A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3329380A1 (de) * 1983-08-13 1985-02-28 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE10006111A1 (de) * 2000-02-11 2001-08-30 Bosch Gmbh Robert Kraftstoffeinspritzventil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034917A (en) * 1975-12-22 1977-07-12 Caterpillar Tractor Co. Variable orifice fuel injection nozzle
DE2948907A1 (de) * 1979-12-05 1981-06-11 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE3006390A1 (de) * 1980-02-21 1981-08-27 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzduese
DE3105686A1 (de) * 1981-02-17 1982-09-02 Robert Bosch Gmbh, 7000 Stuttgart "kraftstoffeinspritzduese"
DE3120060A1 (de) * 1981-05-20 1982-12-09 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3220398A1 (de) * 1982-01-26 1983-07-28 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
DE3318887A1 (de) 1984-11-29
JPH0437273B2 (fr) 1992-06-18
DE3472704D1 (en) 1988-08-18
EP0126947A3 (en) 1986-01-22
JPS59224465A (ja) 1984-12-17
EP0126947A2 (fr) 1984-12-05
US4580728A (en) 1986-04-08

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