EP0118816B1 - Injecteur de combustible pour moteurs à combustion interne - Google Patents

Injecteur de combustible pour moteurs à combustion interne Download PDF

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Publication number
EP0118816B1
EP0118816B1 EP84101906A EP84101906A EP0118816B1 EP 0118816 B1 EP0118816 B1 EP 0118816B1 EP 84101906 A EP84101906 A EP 84101906A EP 84101906 A EP84101906 A EP 84101906A EP 0118816 B1 EP0118816 B1 EP 0118816B1
Authority
EP
European Patent Office
Prior art keywords
cap
piston
fuel
closing body
injection nozzle
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
EP84101906A
Other languages
German (de)
English (en)
Other versions
EP0118816A1 (fr
Inventor
Kurt Seifert
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 EP0118816A1 publication Critical patent/EP0118816A1/fr
Application granted granted Critical
Publication of EP0118816B1 publication Critical patent/EP0118816B1/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
    • 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
    • F02M61/04—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 is based on a fuel injection nozzle according to the preamble of claim 1.
  • the damping effect can be limited in a pressure-dependent manner by appropriate adjustment of the support spring to the damping coefficient. In some cases this is desirable in the high speed range of the internal combustion engine if the return spring can return the cap or the part acted upon by it to the starting position by the beginning of the next injection process.
  • the cap and the support spring are caught in a cage which is guided displaceably between two stops fixed to the housing and is pressed as a whole by the return spring against one of these stops.
  • This version makes assembly easier, but requires the cage as an additional part (EP-A-0084662 according to Art. 54 (3) of the EPC).
  • the arrangement according to the invention with the characterizing features of claim 1 is simpler than the known arrangement because a cage for the support spring and the cap is omitted.
  • FIG. 1 shows a longitudinal section through the exemplary embodiment
  • FIG. 2 shows a variant of the embodiment according to FIG. 1.
  • the injection nozzle 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 inside the injection nozzle.
  • a valve seat 24 is formed in the nozzle body 10 and a valve needle 26 is slidably 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.
  • the nozzle holder 14 contains an inlet bore 36 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 piston-shaped projection 46 corresponds to the guide diameter of the valve needle 26.
  • a cap 48 with a predetermined radial clearance is placed on the projection 46, which has a through bore 50 and a flange edge 52.
  • a support spring 54 engages this, which is supported on the collar 18 and presses the cap 48 against shoulders 56 on the nozzle holder 14.
  • the end section 58 of the cap 48 facing away from the flange edge 52 has an outer diameter which is smaller than the inner diameter of the collar 18.
  • a closing body 60 which is provided with an annular collar 62, also plunges into the bore 50 of the cap 48 with a predetermined radial clearance.
  • a return spring 64 engages this, which is supported on an annular shoulder 66 of the nozzle holder 14.
  • a fuel-filled damping space 68 is formed, which is throttled via the radial clearance surrounding the extension 46 in the bore 50 and is connected to the main flow path of the fuel. This leads from the inlet bore 36 through the chamber 20 and the opening 38 in the chamber 22, from where the fuel reaches the valve seat 24 via the bore 40 in the nozzle body 10 and the annular space 42.
  • the pressure difference between the chamber 20 and the damping chamber 68 increases to such an extent that the pretensioning force of the support spring 54 is overcome. This is followed by the compression of the support spring 54, the cap 48 of the valve needle 26, whereby the damping effect is no longer amplified.
  • the damping effect can be limited to a desired level depending on the pressure will.
  • the shoulder 46 presses the closing body 60 upward by further compressing the return spring 64 via the fuel cushion enclosed in the damping space 68.
  • the return spring 64 is dimensioned such that on the one hand the valve needle 26 can carry out its remaining closing stroke without any significant impediment and that on the other hand the fuel quantity flowing into the damping chamber 68 is pushed out of the damping chamber 68 until the start of the next opening stroke of the valve needle 26 except for the remaining volume shown .
  • a piston-shaped shoulder 46 'de ⁇ VentilnadeI has a frustoconical front shoulder 70, on which the closing body 60 is seated in the closed position of the valve needle. In this position, the collar 62 of the closing body 60 is at a distance h "from the upper end face of the cap 48, which corresponds to an undamped forward stroke.
  • the closing body 60 follows the valve needle or extension 46 ', the' movement of the valve needle taking place without damping. It is thereby achieved that at the beginning of each injection process, a pre-jet is injected with a sufficiently large amount of fuel. After the closing body 60 has been placed on the cap 48, the further movement of the valve needle is damped in the manner described.

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

Claims (3)

1. Injecteur de combustible pour moteurs à combustion interne avec un pointeau de soupape (26) sollicité par un ressort de fermeture (28) et ouvrant dans le sens d'écoulement du carburant, ce pointeau étant relié à un piston (46) qui délimite un espace d'amortissement (68) rempli de carburant, cet espace, lors de la course d'ouverture du pointeau de soupape (26), n'étant relié que par un canal d'étranglement au trajet d'écoulement principal du carburant, et étant ménagé dans un capot (48) enfilé sur le piston (46), ce capot prenant appui du côté de l'orifice d'injection par l'intermédiaire d'un ressort de soutien (54) précontraint sur le boîtier de l'injecteur, et comportant une partie de paroi (60) susceptible d'être déviée vers l'autre côté contre l'action d'un ressort de rappel (64), injecteur caractérisé en ce que le capot (48) et le ressort de soutien (54) sont saisis entre des épaulements (18, 56) du boîtier de l'injecteur et que la partie de paroi du capot (48) susceptible d'être déviée contre l'action du ressort de rappel (64) est une structure de fermeture (60) guidée en étant susceptible de coulisser dans le capot (48).
2. Injecteur selon la revendication 1, caractérisé en ce que le capot (48) comporte un perçage traversant (50) dans lequel, d'une part, le piston (46) pénètre avec un jeu d'étranglement et dans lequel pénètre, d'autre part, la structure de fermeture (60), tandis que l'espace d'amortissement (68) entre les faces frontales en regard l'une de l'autre du piston (46) et de la structure de fermeture (60) est ménagé dans le perçage (50).
3. Injecteur selon la revendication 2, caractérisé en ce que le canal d'étranglement est constitué par le jeu radial entre la paroi du perçage (50) du capot (48) et le piston (46) et/ou la structure de fermeture (60).
EP84101906A 1983-03-04 1984-02-23 Injecteur de combustible pour moteurs à combustion interne Expired EP0118816B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833307671 DE3307671A1 (de) 1983-03-04 1983-03-04 Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3307671 1983-03-04

Publications (2)

Publication Number Publication Date
EP0118816A1 EP0118816A1 (fr) 1984-09-19
EP0118816B1 true EP0118816B1 (fr) 1986-01-29

Family

ID=6192504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101906A Expired EP0118816B1 (fr) 1983-03-04 1984-02-23 Injecteur de combustible pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US4572434A (fr)
EP (1) EP0118816B1 (fr)
JP (1) JPS59168261A (fr)
DE (2) DE3307671A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61149569A (ja) * 1984-12-21 1986-07-08 Diesel Kiki Co Ltd 燃料噴射弁
DE3515723A1 (de) * 1985-05-02 1986-11-06 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1735718A (en) * 1925-04-04 1929-11-12 Andre C Attendu Fuel injector
GB1320920A (en) * 1969-11-12 1973-06-20 Cav Ltd Fuel injection nozzle units
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
DE3460028D1 (en) 1986-03-13
EP0118816A1 (fr) 1984-09-19
JPS59168261A (ja) 1984-09-21
DE3307671A1 (de) 1984-09-06
US4572434A (en) 1986-02-25

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