EP0106183B1 - Injecteur de carburant pour moteurs à combustion interne - Google Patents

Injecteur de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP0106183B1
EP0106183B1 EP83109226A EP83109226A EP0106183B1 EP 0106183 B1 EP0106183 B1 EP 0106183B1 EP 83109226 A EP83109226 A EP 83109226A EP 83109226 A EP83109226 A EP 83109226A EP 0106183 B1 EP0106183 B1 EP 0106183B1
Authority
EP
European Patent Office
Prior art keywords
bore
longitudinal bore
filter element
fuel
closing member
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
EP83109226A
Other languages
German (de)
English (en)
Other versions
EP0106183A1 (fr
Inventor
Karl Hofmann
Erich Jäger
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 EP0106183A1 publication Critical patent/EP0106183A1/fr
Application granted granted Critical
Publication of EP0106183B1 publication Critical patent/EP0106183B1/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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • the check valve can be provided to maintain a certain stand pressure in the injection nozzle so that when the injection valve is closed, no combustion gases can reach its valve seat and contaminate it. That could e.g. occur in injection systems for small, high-speed engines, in which the pressure reduction of the fuel takes place very quickly after the end of the injection.
  • the check valve can also serve to relieve and absorb the so-called swallowing volume of the injection valve, as a result of which the post-spraying caused by the swallowing volume is avoided.
  • the check valve is built directly into the fuel channel, the closing member being provided with a piston guided in a longitudinal bore and the valve seat and the support surface for the closing spring on adjacent parts of the nozzle housing are formed.
  • This design complicates the final assembly of the injection nozzle because additional care must be taken to ensure the correct insertion of the valve parts and, if necessary, measures must also be taken to prevent the valve parts from accidentally falling out of the cavities in the nozzle housing intended to accommodate them.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the check valve forms a functional group with the filter body, which as a whole is pre-assembled in the nozzle housing, e.g. the nozzle holder, can be inserted or pressed in.
  • the final assembly of the injection nozzle is considerably simplified and the further advantage is achieved that the exact bores and fits of the check valve are to be made on the relatively small filter body independently of the nozzle housing.
  • the closing member Because of its design as a piston, the closing member has a relief function, so that splashing is avoided.
  • the injection nozzle has a nozzle body 10 which, together with an intermediate disk 11, is clamped to a nozzle holder 14 via a clamping nut 12.
  • the nozzle body 10 contains a valve needle 17 which can be displaced against the force of a closing spring 16 and which monitors a valve seat which is arranged upstream of spray openings 18 in the nozzle body 10.
  • the nozzle holder 14 contains a fuel inlet channel, which consists of three bore sections 20, 22, 24 of different diameters. The bore section 24 corresponds to a channel 25 in the nozzle body 10, which opens into a pressure chamber surrounding the valve needle 17.
  • the valve needle 17 In the area of the pressure chamber, the valve needle 17 is provided with a pressure shoulder, and the pressure chamber is connected to the valve seat via an annular space between the valve needle 17 and the bore of the nozzle body 10.
  • the valve needle 17 is displaced by the pressure of the incoming fuel against the force of the closing spring 16, the valve being opened and the fuel reaching the spray openings 18.
  • the leakage oil entering the closing spring 16 receiving chamber 26 is conducted via a further bore 28 to a connection piece (not visible in the drawing) for the connection of a leakage oil line.
  • a rod-shaped filter body 30 is inserted, which forces the incoming fuel to pass through narrow gaps, which is formed between the profiled outer periphery of the filter body 30 and the surrounding wall 31 of the bore section 20.
  • the fuel is filtered and dirt particles, swarf and the like are retained from a certain size.
  • the filter body 30 is provided in each case with a collar 32, 34 on each of its two ends (FIG. 2), between which there is a middle section 36 which is slightly weakened in diameter.
  • the two bundles 32, 34 fill the boring section 20 in the nozzle holder 14 appropriately and hold the filter body 30 frictionally therein.
  • This configuration of the filter body 30 is between its central section 36 and the bore wall 31 of the nozzle holder 14 an annular space 38 is formed, through which the fuel must pass in the manner described in more detail below.
  • the filter body 30 is provided with a continuous longitudinal bore 30, into which a hollow screw 42 is inserted on the inlet side and which is closed on the outlet side by a screw plug 44.
  • the hollow screw 42 is provided with an axial extension 46 and a central bore 48 which opens out on the end face 50 of the extension 46.
  • the screw plug 44 has a shoulder 52 which carries an end pin 54 and supports a closing spring 56 which presses a piston-like closing member 60 against the end face 50 of the hollow screw 42.
  • a first transverse bore 62 leads out of the longitudinal bore 40, which has a rectangular cross section and whose inlet-side wall section 63 is offset by the dimension a relative to the end face 50 of the hollow screw 42.
  • the transverse bore 62 leads into a longitudinal groove 64 on the circumference of the filter body 30, which, viewed in the direction of flow of the fuel, has an increasingly smaller, V-shaped cross section and ends on both sides in front of the end faces of the filter body 30.
  • One flank 66 (FIG. 3) of the longitudinal groove 64 lies in a plane 68 which extends at a distance b from a plane 72 which receives the longitudinal axis 70 of the filter body 30.
  • the other flank 74 of the longitudinal groove 64 is perpendicular to the flank 66 and extends at an angle c (FIG. 2) to the longitudinal axis 70 of the filter body 30.
  • This cross-sectional design and arrangement result in the decreasing depth of the longitudinal groove 64 when milling.
  • a second transverse bore 76 leads out of the longitudinal bore 40 in the region of the front pin 54, which has a circular cross section and opens into a longitudinal groove 78 on the circumference of the filter body 30.
  • the longitudinal groove 78 is formed in mirror image in cross section to the longitudinal groove 64 and, like this, arranged at an angle c to the longitudinal axis 70.
  • the longitudinal groove 78 is, however, laid out in such a way that it breaks through the outlet-side collar 34 and opens out at the annular end face 80 delimiting this collar.
  • two further longitudinal grooves 82, 84 are provided, which are designed and arranged like the longitudinal groove 78, and each form an angle of 120 ° between them and with the longitudinal groove 78.
  • Each longitudinal groove 78, 82 and 84 forms an edge recess 86 in the collar 34, via which the annular space 38 is connected to the further bore sections 22, 24, 25 of the fuel supply channel.
  • the closing member 60 together with the end face 50 and the edge formed at the junction of the transverse bore 62 in the longitudinal bore 40, forms a check valve, designated as a whole in FIG. 4, with the reference number 90. This lies in the line connection 48, 40, 62, 64, which leads into the annular space 38 on the inlet side. From there, the fuel reaches the continuing fuel channel via the longitudinal grooves 78, 82, 84 and the three edge recesses 86. The fuel is redirected several times and forced to flow through narrow gaps, which results in the desired filter effect.
  • the increasing fuel pressure at the beginning of an injection process moves the closing member 60 away from the end face 50 against the force of the closing spring 56 until the closing member 60 opens the transverse bore 62 and the fuel can pass into the further gaps and channels.
  • the fuel volume displaced by the closing member 60 in this process can pass through the transverse bore 76 and the longitudinal groove 78 into the further fuel channel.
  • the closing spring 56 quickly leads the closing member 60 back against the end face 50, the transverse bore 62 being closed and a certain volume of fuel being sucked back into the space between the closing member 60 and the screw plug 44 via the transverse bore 76.
  • the distance a is dimensioned such that the fuel volume drawn back corresponds approximately to the swallowing volume of the injection valve 17.

Landscapes

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

Claims (5)

1. Soupape d'injection de carburant pour moteurs à combustion interne avec un canal de carburant qui, par l'intermédiaire d'une structure de filtration (30) insérée dans le boîtier de la buse, aboutit aux orifices d'injection d'une soupape d'injection, et dans lequel est, en outre, incorporée une soupape de retenue (90) s'ouvrant dans la direction d'écoulement du carburant, buse d'injection caractérisée par les particularités suivantes connues en soi:
a) la soupape de retenue (90) est intégrée dans la structure de filtration (30),
b) la structure de filtration (30) comporte un perçage longitudinal (40) partant de son extrémité frontale située en amont et fermé à l'autre extrémité frontale, perçage longitudinal à partir duquel un perçage transversal (62) aboutit à un espace annulaire (38) ménagé entre la structure de filtration (30) et la paroi (31) qui l'entoure du boîtier (14) de la buse, cet espace annulaire étant relié par l'intermédiaire de fentes filtrantes (78) avec un tronçon branché à la suite (22, 24, 25) du canal de carburant,
c) l'organe de fermeture (60) de la soupape de retenue (90) revêt la forme d'un piston inséré dans le perçage longitudinal (40) et guidé dans ce perçage, et qui commande le débouché du perçage transversal (62) dans le perçage longitudinal (40),
d) dans la partie du perçage longitudinal (40) s'étendant en aval de l'organe de fermeture (60) est inséré un ressort de fermeture (56) poussant l'organe de fermeture (60) contre une butée (50) dans le perçage longitudinal (40),
e) la partie du perçage longitudinal (40) recevant le ressort de fermeture (56) est rèliée, par l'intermédiaire d'un canal de délestage (76, 38, 78), avec la partie branchée à la suite (22, 24, 25) du canal de carburant, et
f) la butée (50) dans le perçage longitudinal (40) est disposée à une distance (a) en amont du débouché du perçage transversal (62), grâce à quoi lors de la commande à l'ouverture du perçage transversal (62) par l'organe de fermeture (60), un volume est expulsé qui correspond au moins à une partie du volume d'absorption de la soupape d'injection (17).
2. Buse d'injection selon la revendication 1, caractérisée en ce que le perçage longitudinal (40) à l'extrémité frontale située en amont de la structure de filtration (30), est fermé par un bouchon (44) sur lequel prend appui le ressort de fermeture (56).
3. Buse d'injection selon la revendication 1 ou 2, caractérisée en ce que la butée (50) pour l'organe de fermeture (60) est formée sur la face frontale d'une vis creuse (42) insérée dans le perçage longitudinal (40).
4. Buse d'injection selon l'une des précédentes revendications, caractérisée en ce que le canal de délestage comporte un perçage transversal (76) qui relie la partie du perçage longitudinal (40) recevant le ressort de fermeture (56) avec l'espace annulaire.
5. Buse d'injection selon l'une des revendications 1 à 4, carctérisée en ce que le perçage transversal (62) commandé par l'organe de fermeture (60) débouche au voisinage d'une gorge longitudinale (64) sur la périphérie de la structure de filtration (30), cette gorge longitudinale se terminant avant les deux extrémités frontales de la structure de filtration (30).
EP83109226A 1982-10-13 1983-09-17 Injecteur de carburant pour moteurs à combustion interne Expired EP0106183B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3237932 1982-10-13
DE19823237932 DE3237932A1 (de) 1982-10-13 1982-10-13 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0106183A1 EP0106183A1 (fr) 1984-04-25
EP0106183B1 true EP0106183B1 (fr) 1987-01-28

Family

ID=6175613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109226A Expired EP0106183B1 (fr) 1982-10-13 1983-09-17 Injecteur de carburant pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US4548356A (fr)
EP (1) EP0106183B1 (fr)
JP (1) JPS5987270A (fr)
DE (2) DE3237932A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61107969U (fr) * 1984-12-21 1986-07-09
DE4123787A1 (de) * 1991-07-18 1993-01-21 Bosch Gmbh Robert Verfahren zur einstellung eines brennstoffeinspritzventils und brennstoffeinspritzventil
DE4437927C2 (de) * 1994-10-24 1996-09-12 Bosch Gmbh Robert Magnetventilgesteuerte Kraftstoffeinspritzvorrichtung mit einer Einspritzdüse zur Kraftstoffeinspritzung in den Brennraum einer Dieselbrennkraftmaschine
DE19608608A1 (de) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10208544A1 (de) * 2002-02-27 2003-09-11 Hatz Motoren Einspritzdüse mit Kraftstofffilter
EP2034173A1 (fr) * 2007-09-07 2009-03-11 Siemens VDO Automotive S.p.A. Manchon de raccordement de carburant doté d'un filtre à carburant
USD934298S1 (en) * 2020-01-29 2021-10-26 Caterpillar Inc. Injector
USD934299S1 (en) * 2020-01-29 2021-10-26 Caterpillar Inc. Injector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1266725B (de) * 1963-04-04 1968-04-25 Rolls Royce Zylindrischer Filterkoerper
DE1955791A1 (de) * 1969-11-06 1971-05-13 Purolator Filter Gmbh Filtereinsatz,insbesondere fuer Verbrennungskraftmaschinen
DE2311966A1 (de) * 1972-03-08 1973-09-20 Sperry Rand Ltd Filteraggregat
EP0064146A1 (fr) * 1981-05-06 1982-11-10 Klöckner-Humboldt-Deutz Aktiengesellschaft Système d'injection pour injecter deux combustibles par une seule buse d'injection
EP0084182A1 (fr) * 1982-01-16 1983-07-27 Robert Bosch Gmbh Buse d'injection de carburant pour moteurs à combustion interne

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1300653A (en) * 1917-01-13 1919-04-15 Hopedale Mfg Co Check-valve.
DE715751C (de) * 1936-02-18 1942-01-06 Bosch Gmbh Robert Brennstoffeinspritzanlage fuer Brennkraftmaschinen
US2605142A (en) * 1948-10-25 1952-07-29 Gold Harold Spray device
US2621077A (en) * 1948-11-10 1952-12-09 Pieroni Bruno Check valved nozzle
DE802601C (de) * 1949-02-25 1951-02-15 Kammer Engines Ltd Brennstoff-Einspritzvorrichtung fuer Verbrennungsmotoren
US3143163A (en) * 1959-09-07 1964-08-04 Renner Josef Oil burner
FR1302021A (fr) * 1961-07-18 1962-08-24 Bosch Gmbh Robert Pompe à injection de combustible pour moteurs à combustion interne
US3223331A (en) * 1962-08-21 1965-12-14 Clarence P Baker Oil burner nozzles
US3314481A (en) * 1964-08-07 1967-04-18 Exxon Production Research Co Downhole water filter
DE2028453A1 (de) * 1970-06-10 1971-12-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzventil
DE2119973A1 (de) * 1971-04-23 1972-11-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzdüse
US3912630A (en) * 1972-10-24 1975-10-14 Nordson Corp Filter cartridge for thermoplastic applicator system
US3980234A (en) * 1975-06-13 1976-09-14 Stanadyne, Inc. Fuel injection nozzle
AT362201B (de) * 1978-03-29 1981-04-27 Friedmann & Maier Ag Brennstoffeinspritzvorrichtung fuer einspritz- brennkraftmaschinen
US4306681A (en) * 1980-02-21 1981-12-22 Laitio Peter A J Barrel and fuel injector utilizing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1266725B (de) * 1963-04-04 1968-04-25 Rolls Royce Zylindrischer Filterkoerper
DE1955791A1 (de) * 1969-11-06 1971-05-13 Purolator Filter Gmbh Filtereinsatz,insbesondere fuer Verbrennungskraftmaschinen
DE2311966A1 (de) * 1972-03-08 1973-09-20 Sperry Rand Ltd Filteraggregat
EP0064146A1 (fr) * 1981-05-06 1982-11-10 Klöckner-Humboldt-Deutz Aktiengesellschaft Système d'injection pour injecter deux combustibles par une seule buse d'injection
EP0084182A1 (fr) * 1982-01-16 1983-07-27 Robert Bosch Gmbh Buse d'injection de carburant pour moteurs à combustion interne

Also Published As

Publication number Publication date
DE3369548D1 (en) 1987-03-05
EP0106183A1 (fr) 1984-04-25
JPS5987270A (ja) 1984-05-19
US4548356A (en) 1985-10-22
DE3237932A1 (de) 1984-04-19

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