EP0072269B1 - Injecteur de combustible notamment pour un moteur à combustion interne - Google Patents

Injecteur de combustible notamment pour un moteur à combustion interne Download PDF

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Publication number
EP0072269B1
EP0072269B1 EP82401238A EP82401238A EP0072269B1 EP 0072269 B1 EP0072269 B1 EP 0072269B1 EP 82401238 A EP82401238 A EP 82401238A EP 82401238 A EP82401238 A EP 82401238A EP 0072269 B1 EP0072269 B1 EP 0072269B1
Authority
EP
European Patent Office
Prior art keywords
injector
fuel
injection
combustion engine
lateral
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
EP82401238A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0072269A1 (fr
Inventor
Patrick Renaud
Jean-Paul Bourget
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.)
MAN Energy Solutions France SAS
Original Assignee
Societe dEtudes de Machines Thermiques SEMT SA
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 Societe dEtudes de Machines Thermiques SEMT SA filed Critical Societe dEtudes de Machines Thermiques SEMT SA
Publication of EP0072269A1 publication Critical patent/EP0072269A1/fr
Application granted granted Critical
Publication of EP0072269B1 publication Critical patent/EP0072269B1/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
    • F02M61/04—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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the present invention relates to a fuel injector, in particular for an internal combustion engine.
  • a fuel injector comprising a substantially cylindrical body, traversed by a fuel injection conduit substantially parallel to the longitudinal axis of the body and comprising a lateral fuel inlet ; the body successively containing, from bottom to top, an injection needle extended from a pusher comprising a head receiving the support of a closing return spring prestressed using an adjusting screw, this screw being located under the side fuel inlet.
  • the lateral fuel inlet is not located in the lower half of the body, so that an injection pipe must pass through practically the entire length of the body, and this unnecessarily increases the volume of fuel between the injection pump outlet and the needle.
  • the adjusting screw is accessible by - a slot but it is necessary to provide a well for access to this slot and the operation of the screw then lacks safety and precision.
  • the object of the present invention is to remedy these drawbacks by placing the lateral fuel inlet in the lower half of the body, and by incorporating a means for controlling the screw which can be operated from the outside.
  • the subject of the present invention is a fuel injector, in particular for an internal combustion engine, of the type comprising a substantially cylindrical body traversed by an injection conduit substantially parallel to the longitudinal axis of said body and comprising an inlet lateral fuel, said body successively containing, from bottom to top, an injection needle, a pusher provided with a head, a return spring bearing on the head of the pusher a screw for adjusting the spring preload located under the side entry, characterized in that the side entry is located in the lower half of said body and in that the adjusting screw is coaxially secured to a driven pinion meshing with a driving pinion coaxially secured to a control rod rotatably mounted in the injector body and extending to the upper end of the injector so as to be operable from the outside.
  • the fuel supply 1, in particular for an internal combustion engine, comprises a body 2, substantially cylindrical, crossed by a fuel injection pipe 15, substantially parallel to the longitudinal central axis of the body 2, and comprising an inlet lateral 3 of fuel located in the lower half of the body 2, approximately halfway up thereof in the example shown in the appended figure.
  • the body 2 successively contains, from bottom to top, an injection needle 4 extended by an elongated pusher 5 comprising a head 6 receiving the support of a spring 7 for closing the prestressed closure using a screw 8.
  • the body 2 of the injector 1 is disposed in a sheath 9 housed in the cylinder head 10; the references 12 representing the valves arranged on either side of the injector on their respective seats 13. Different seals 29 are also provided between the cylinder head 10, the sleeve 9 and the body 2 of the injector.
  • the injection needle 4 whose conical end 18 rests, in the closed position of the injector, on a conical seat, controls, in a conventional manner, the injection of fuel into the combustion chamber 16 via an injection nozzle 17.
  • the pusher is short enough, in the longitudinal direction, so that the level of lateral fuel inlet is located above the upper end of the assembly constituted by the adjusting screw 8, the spring 7, the pusher 5 and the injection needle 4 placed in series.
  • the pusher 5 is substantially shorter than the injection needle 4, the length of the pusher representing for example about a quarter of that of the needle. It may further be noted that the length and diameter of the pusher 5 are reduced, respectively, to about one tenth and to about half the length and diameter of a conventional pusher.
  • the body 2 of the injector comprises an upper part 20 where the injection conduit 15 is substantially parallel to the longitudinal central axis of the body 2.
  • the level of lateral fuel supply is located substantially halfway up the injector body above the adjusting screw 8, and the fuel supply device comprises an inlet pipe 35 connected by a connecting screw 36 to the pipe 15.
  • the body 2 of the injector further comprises an intermediate piece 21 surrounding the body 37 of the pusher 5 and a lower part 23 where the injection duct 15 is oblique and opens into an annular groove 24.
  • the intermediate piece 21 is pierced with a bore 22 which connects the two parts of the injection pipe located in the upper 20 and lower 23 parts of the body 2 of the injector. The fitting of the intermediate piece 21 is facilitated by a centering pin 27.
  • the upper parts 20 and lower lower 23, as well as the intermediate part 21 are joined by a part 26 enveloping the lower part 23, the intermediate part 21 as well as the lower end of the upper part 20, the sealing at the base of this part 26 being ensured by a metal O-ring 28.
  • the adjusting screw 8 is coaxially secured to a driven pinion 30 meshing with a driving pinion 31 coaxially secured to a control rod 32, rotatably mounted in the body 2 of the injector 1, and s' extending to the upper end of the injector so as to be operable from the outside.
  • a locking pin 33 of the upper end of the control rod 32 is provided.
  • an injector of this type is well known and will be briefly indicated below.
  • a certain amount of fuel is discharged under pressure into the injection pipe 15 and enters the annular chamber 24.
  • the fuel pressure first generates a pushing force on the shoulder 25 of the needle 4 which has the effect of lifting the conical end 18 of the needle 4 from its seat 19.
  • a part of the fuel is then expelled by the injection nozzle 17 into the combustion chamber 16.
  • the injection continues as long as the fuel pressure exerted on the shoulder 25 is sufficient to overcome the force of the return spring 7. After which, the needle is reapplied on its seat 19 and the injection is stopped until the next cycle.
  • the pusher 5 is of reduced length and therefore has a relatively low inert mass makes it possible to improve the injection of fuel, and in particular to avoid disturbances in the rebound of the injection needle on its seat which occur with a relatively heavy pusher of the usual type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
EP82401238A 1981-08-07 1982-07-01 Injecteur de combustible notamment pour un moteur à combustion interne Expired EP0072269B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8115406A FR2511084B1 (fr) 1981-08-07 1981-08-07 Injecteur de combustible notamment pour un moteur a combustion interne
FR8115406 1981-08-07

Publications (2)

Publication Number Publication Date
EP0072269A1 EP0072269A1 (fr) 1983-02-16
EP0072269B1 true EP0072269B1 (fr) 1985-10-09

Family

ID=9261308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401238A Expired EP0072269B1 (fr) 1981-08-07 1982-07-01 Injecteur de combustible notamment pour un moteur à combustion interne

Country Status (16)

Country Link
US (1) US4480792A (enExample)
EP (1) EP0072269B1 (enExample)
JP (1) JPS5827879A (enExample)
KR (1) KR880000479B1 (enExample)
BR (1) BR8204049A (enExample)
CS (1) CS241116B2 (enExample)
DD (1) DD202595A5 (enExample)
DE (1) DE3266801D1 (enExample)
DK (1) DK154167C (enExample)
ES (1) ES273654Y (enExample)
FI (1) FI70301C (enExample)
FR (1) FR2511084B1 (enExample)
NO (1) NO154238C (enExample)
PL (1) PL137105B1 (enExample)
SU (1) SU1144623A3 (enExample)
YU (1) YU168782A (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8329798D0 (en) * 1983-11-08 1983-12-14 Lucas Ind Plc Fuel injection nozzles
AU689430B3 (en) * 1995-07-28 1998-03-26 Dan Maxwell Etherington Vegetable oil extraction method and equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777984A (en) * 1972-01-20 1973-12-11 Mack Trucks Miniature fuel injection nozzle and holder assembly
GB1557057A (en) * 1975-12-06 1979-12-05 Bosch Gmbh Robert Fuel injection nozzels for internal combustion engines

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB736446A (en) * 1953-04-15 1955-09-07 Cav Ltd Liquid fuel injection nozzle holders for internal combustion engines
JPS428884Y1 (enExample) * 1964-04-08 1967-05-12
GB1210381A (en) * 1967-01-13 1970-10-28 Bryce Berger Ltd Liquid fuel injection nozzle units for internal combustion engines
DE2120465C3 (de) * 1971-04-27 1973-10-11 Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg Brennstoffeinspritzventil
FR2216455B1 (enExample) * 1973-02-07 1978-03-24 Bosch Gmbh Robert
JPS526409A (en) * 1975-07-07 1977-01-18 Hitachi Medical Corp Electronic scanning type ultrasonic deflection system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777984A (en) * 1972-01-20 1973-12-11 Mack Trucks Miniature fuel injection nozzle and holder assembly
GB1557057A (en) * 1975-12-06 1979-12-05 Bosch Gmbh Robert Fuel injection nozzels for internal combustion engines

Also Published As

Publication number Publication date
KR880000479B1 (ko) 1988-04-07
EP0072269A1 (fr) 1983-02-16
ES273654Y (es) 1984-11-16
FR2511084A1 (fr) 1983-02-11
JPH0549815B2 (enExample) 1993-07-27
DK154167B (da) 1988-10-17
KR840000736A (ko) 1984-02-27
US4480792A (en) 1984-11-06
DE3266801D1 (en) 1985-11-14
PL237769A1 (en) 1983-02-28
SU1144623A3 (ru) 1985-03-07
FI822721A0 (fi) 1982-08-05
ES273654U (es) 1984-04-01
CS241116B2 (en) 1986-03-13
PL137105B1 (en) 1986-04-30
DD202595A5 (de) 1983-09-21
CS579882A2 (en) 1985-07-16
FR2511084B1 (fr) 1985-10-04
YU168782A (en) 1988-04-30
FI70301B (fi) 1986-02-28
NO154238C (no) 1986-08-13
FI822721L (fi) 1983-02-08
FI70301C (fi) 1986-09-15
BR8204049A (pt) 1983-07-05
JPS5827879A (ja) 1983-02-18
DK154167C (da) 1989-03-20
NO822692L (no) 1983-02-08
NO154238B (no) 1986-05-05
DK345482A (da) 1983-02-08

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