EP0106183A1 - 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
EP0106183A1
EP0106183A1 EP83109226A EP83109226A EP0106183A1 EP 0106183 A1 EP0106183 A1 EP 0106183A1 EP 83109226 A EP83109226 A EP 83109226A EP 83109226 A EP83109226 A EP 83109226A EP 0106183 A1 EP0106183 A1 EP 0106183A1
Authority
EP
European Patent Office
Prior art keywords
filter body
injection nozzle
bore
check valve
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.)
Granted
Application number
EP83109226A
Other languages
German (de)
English (en)
Other versions
EP0106183B1 (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 static 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. done 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 injectors caused by the swallowing volume are avoided:
  • 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 is pre-assembled as a whole in the nozzle housing, for. B. the nozzle holder, can be inserted or pressed.
  • 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 attached to the relatively small filter body independently of the nozzle housing.
  • the closing element of the check valve can also be designed as a relief piston in its arrangement according to the invention in the filter body according to claim 2, in order to absorb the swallowing volume of the injection valve and to avoid splashing.
  • the design of the filter body as claimed in claim 3 as a rod filter inserted into the fuel channel and delimiting filter gaps with the surrounding walls of the fuel channel is particularly suitable for installation a check valve.
  • 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, the spray openings 18 in the nozzle body 10 is upstream.
  • 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.
  • 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 passed through a further bore 28 to a connecting 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 circumference of the filter body 30 and the surrounding wall 31 of the bore section 20.
  • the fuel is filtered and dirt particles, chips 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 collars 32, 34 fill the bore section 20 in the nozzle holder 14 and hold the filter body 30 firmly in place.
  • This configuration of the filter body 30 forms an annular space 38 between its central section 36 and the bore wall 31 of the nozzle holder 14, 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 40, into which a banjo bolt 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 shoulder 46 and a central bore 48 which opens out on the end face 50 of the shoulder 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 jacket 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.
  • 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, placed 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.
  • 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 non-return 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 fuel volume 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)
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
DE19823237932 DE3237932A1 (de) 1982-10-13 1982-10-13 Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3237932 1982-10-13

Publications (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Families Citing this family (7)

* 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
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
DE715751C (de) * 1936-02-18 1942-01-06 Bosch Gmbh Robert Brennstoffeinspritzanlage fuer Brennkraftmaschinen
DE802601C (de) * 1949-02-25 1951-02-15 Kammer Engines Ltd Brennstoff-Einspritzvorrichtung fuer Verbrennungsmotoren
FR1302021A (fr) * 1961-07-18 1962-08-24 Bosch Gmbh Robert Pompe à injection de combustible pour moteurs à combustion interne
US3777986A (en) * 1971-04-23 1973-12-11 Bosch Gmbh Robert Fuel injection nozzle
GB2017814A (en) * 1978-03-29 1979-10-10 Friedmann & Maier Ag Fuel injection device

Family Cites Families (14)

* 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.
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
US3143163A (en) * 1959-09-07 1964-08-04 Renner Josef Oil burner
US3223331A (en) * 1962-08-21 1965-12-14 Clarence P Baker Oil burner nozzles
GB976521A (en) * 1963-04-04 1964-11-25 Rolls Royce Liquid filter
US3314481A (en) * 1964-08-07 1967-04-18 Exxon Production Research Co Downhole water filter
DE1955791A1 (de) * 1969-11-06 1971-05-13 Purolator Filter Gmbh Filtereinsatz,insbesondere fuer Verbrennungskraftmaschinen
DE2028453A1 (de) * 1970-06-10 1971-12-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzventil
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
US4306681A (en) * 1980-02-21 1981-12-22 Laitio Peter A J Barrel and fuel injector utilizing the same
DE3117796A1 (de) * 1981-05-06 1982-11-25 Klöckner-Humboldt-Deutz AG, 5000 Köln Einspritzsystem zum einspritzen zweier brennstoffe durch eine einspritzduese
DE3201218A1 (de) * 1982-01-16 1983-07-28 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE715751C (de) * 1936-02-18 1942-01-06 Bosch Gmbh Robert Brennstoffeinspritzanlage fuer Brennkraftmaschinen
DE802601C (de) * 1949-02-25 1951-02-15 Kammer Engines Ltd Brennstoff-Einspritzvorrichtung fuer Verbrennungsmotoren
FR1302021A (fr) * 1961-07-18 1962-08-24 Bosch Gmbh Robert Pompe à injection de combustible pour moteurs à combustion interne
US3777986A (en) * 1971-04-23 1973-12-11 Bosch Gmbh Robert Fuel injection nozzle
GB2017814A (en) * 1978-03-29 1979-10-10 Friedmann & Maier Ag Fuel injection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
US4548356A (en) 1985-10-22
DE3369548D1 (en) 1987-03-05
EP0106183B1 (fr) 1987-01-28
DE3237932A1 (de) 1984-04-19
JPS5987270A (ja) 1984-05-19

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