EP0821155B1 - Endothermal injection engine - Google Patents

Endothermal injection engine Download PDF

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Publication number
EP0821155B1
EP0821155B1 EP19970112561 EP97112561A EP0821155B1 EP 0821155 B1 EP0821155 B1 EP 0821155B1 EP 19970112561 EP19970112561 EP 19970112561 EP 97112561 A EP97112561 A EP 97112561A EP 0821155 B1 EP0821155 B1 EP 0821155B1
Authority
EP
European Patent Office
Prior art keywords
injector
head
engine
annular member
housed
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 - Lifetime
Application number
EP19970112561
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0821155A1 (en
Inventor
Pietro Bianchi
Giuseppe Cimino
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.)
Iveco SpA
Original Assignee
Iveco Fiat SpA
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 Iveco Fiat SpA filed Critical Iveco Fiat SpA
Publication of EP0821155A1 publication Critical patent/EP0821155A1/en
Application granted granted Critical
Publication of EP0821155B1 publication Critical patent/EP0821155B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the present invention relates to an endothermal injection engine, particularly but not exclusively of the compression ignition (Diesel) type used in industrial vehicles.
  • the injectors are mounted in the engine head, preferably in a position coaxial to the relative cylinder, with the atomiser unit disposed to pass through a wall of the head bounding the top of the combustion chamber; the injector extends axially into the tappet space between the springs of the valves which bear at the bottom on an abutment plate, or spring plate, secured to the head or forming an integral part of this head.
  • the injector is generally provided with a coupling for a connection member of a high pressure fuel supply tube and a collection tube for fuel flowing back from the injector to the tank.
  • the coupling extends integrally in a snap-locking manner from the body of the injector and is provided in the upper portion thereof, i.e. above the spring plate.
  • the coupling and the relative supply connector in particular occupy additional-space in an area, such as the tappet space, in which the space available is already very small because of the bulk of the valve springs, the injector body and the relative fastening bracket. This obviously creates very restrictive design constraints.
  • the high and low pressure tubes have to project, moreover, from the tappet space thereby making it necessary to use external oil seals and creating problems as regards the assembly and dismantling of the cover.
  • FR-A-1 318 701 discloses an endothermal injection engine according to the preamble of claim 1. There is however no disclosure of a fuel recycling circuit.
  • the object of the present invention is to provide an endothermal injection engine which makes it possible to remedy the drawbacks and limitations connected with the known engines described above.
  • FIG. 1 an endothermal engine (shown in part) is shown overall by 1.
  • the engine 1 comprises a block (not shown) defining a plurality of cylinders (not shown) and a head 2 advantageously made by fusion from aluminium alloy.
  • the engine 1 comprises four valves 3 per cylinder, which are housed and guided in a known manner in the head 2.
  • the valves are controlled by a valve control unit 5 of known type, with cams and rocker arms, housed in a tappet space 6 provided in the head 2.
  • the valves 3 are normally kept closed by respective springs 7 which bear on a plate 8, or spring plate, secured to a wall 9 of the head 2 bounding the bottom of the tappet space 6.
  • the engine 1 further comprises an injector 10 for each cylinder; the following description refers, for the sake of brevity, solely to the injector 10 shown in the drawings, as it is evident that similar considerations apply to the other injectors.
  • the injector 10 has a substantially tubular, elongate body 14 of axis A, comprising a lower portion 18 which houses an atomiser unit of known type (not shown) and an upper portion 22 which houses an electro-hydraulic control unit (not shown).
  • the lower portion 18 of the body 14 is housed in a housing 16 of the head 2 coaxial to the relative cylinder with the possible interposition of a sealing ring 19, and has an end nozzle 20 facing this cylinder; the upper portion 22 extends into the tappet space 6 between the springs 7 of the valves 3.
  • the injector 10 has, at the location of an intermediate zone 24 of the body 14, a conical opening 25 for the intake of high pressure fuel and an outlet opening 26 for the recycling of the fuel at low pressure.
  • the latter receives the flow of fuel recycled at low pressure formed both by the seepage along the atomiser unit and by the exhaust flow from the control unit via an inner longitudinal channel 17 of the injector 10 (Figs. 2 and 3).
  • the above-mentioned intermediate zone 24 is disposed to pass through an annular clamping member 27 housed with play in a housing 28 provided in the wall of the head 2 below the spring plate 8 and communicating with the housing 16.
  • the member 27 integrally comprises a bushing 30 of axis A, provided with an axial through cavity 31 housing the intermediate zone 24 of the injector 10, and a tubular sleeve 32, extending radially in a snap-locking manner from the bushing 30 and provided with a longitudinal through hole 33 which communicates with the cavity 31 at the location of the supply opening 25 of the injector 10.
  • a sealing ring 38 is interposed between the bushing 30 and the injector 10, above the supply opening 25.
  • the bushing 30 has a lower portion 34 of reduced diameter, which extends into a lower section 35 of correspondingly reduced diameter of the housing 28, with the interposition of a sealing ring 36; the axial length of the portion 34 is smaller than that of the section 35, so as to leave a lower portion of the latter free, defining an annular chamber 37 with which the outlet opening 26 of the injector 10 communicates.
  • the injector 10 is associated with a high pressure fuel supply tube 40.
  • the tube 40 has an enlarged head 41 with a nose-shaped endpiece which is urged, in a substantially leak-tight manner, against the conical opening 25 of the injector 10.
  • This thrust action is produced by a tubular connector 42, externally coaxial with the tube 40, which has a threaded end 43 screwed into a threaded section of the hole 33 and cooperating axially against the head 41.
  • a pair of sealing rings 45 (Fig. 2) is interposed between an intermediate portion 44 of the connector 42 and an end of the sleeve 32.
  • the connector 42 is mounted to pass through a lateral hole 46 of the head 2, through which the tube 40 projects laterally from the engine 1, with the interposition of a sealing ring 48. Outside the wall, the connector 42 is terminated by a hexagonal manipulation head 49 that allows it to be screwed and unscrewed by an appropriate spanner.
  • the annular chamber 37 communicates with a fuel recycling channel 50 provided in the head 2.
  • the injector 10 is locked axially in the housing 16 by a bracket 54 of known type, which has one end 55 bearing on the head 2, an opposite forked end 56 cooperating with the injector 10 and a central portion 57 secured to this head by a bolt means 58.
  • the end 56 cooperates prismatically with a portion 59 of the body 14 of the injector 10 provided with lateral facets 60 and exerts an axial downward thrust on respective lateral shoulders 61 of this body.
  • the high pressure fuel is supplied to the injector 10 via the relative tube 40. Any seepage of fuel through the contact area between the head 41 of the tube and the opening 25 flows, between the body of the injector 10 and the opening 30, into the chamber 37. The low pressure fuel discharged from the outlet opening 26 of the injector 10 also flows into this chamber 37.
  • the low pressure fuel therefore flows from the chamber 37 into the recycling duct 50 since it cannot flow in any other direction as a result of the sealing rings 19 and 36 disposed in the vicinity and on opposite sides of the chamber 37 and the sealing rings 38 and 45. This prevents any contamination of the fuel and the lubricating oil in the tappet space 6.
  • the clamping force of the connector 42 is exerted solely on the member 27 and not on the head 2.
  • the injector receives a radial load from the tube 40 at the location of the opening 25 and an equivalent and opposite load from the bushing 30 at the location of an opposite generatrix of the portion 24, it is not subject to torsional deformation which could compromise its operating accuracy.
  • the injector 10 may be of any type, in particular an electro-injector adapted to a "common rail" system, or of the conventional type in which the injection is controlled exclusively by the supply pressure.
  • the recycled fuel may be collected in a series of ducts provided in the cylinder head that is more complex than that illustrated, depending on particular application requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP19970112561 1996-07-23 1997-07-22 Endothermal injection engine Expired - Lifetime EP0821155B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO960635 1996-07-23
IT96TO000635A IT1284691B1 (it) 1996-07-23 1996-07-23 Motore endotermico a iniezione

Publications (2)

Publication Number Publication Date
EP0821155A1 EP0821155A1 (en) 1998-01-28
EP0821155B1 true EP0821155B1 (en) 2001-11-28

Family

ID=11414810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970112561 Expired - Lifetime EP0821155B1 (en) 1996-07-23 1997-07-22 Endothermal injection engine

Country Status (4)

Country Link
EP (1) EP0821155B1 (es)
DE (1) DE69708542T2 (es)
ES (1) ES2168551T3 (es)
IT (1) IT1284691B1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9824735D0 (en) * 1998-11-12 1999-01-06 Lucas Ind Plc Injector and injector assembly
DE10304392A1 (de) * 2002-09-30 2004-04-08 Fev Motorentechnik Gmbh Zylinderkopf für eine direkteinspritzende Brennkraftmaschine
DE102010050296B4 (de) 2010-11-06 2013-11-07 Hans-Jürgen Guido Anschlussanordnung für eine rohrförmige Kraftstoffleitung
US9239035B2 (en) 2010-11-06 2016-01-19 Hans-Jurgen Guido Connection arrangement for a tubular fuel line
DE102011078387A1 (de) * 2011-06-30 2013-01-03 Robert Bosch Gmbh Kraftstoffinjektor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533195A (en) * 1946-09-23 1950-12-05 Baldwin Locomotive Works Fuel oil leakage detector for diesel engines
FR1318701A (fr) * 1962-01-09 1963-02-22 Alsacienne Constr Meca Dispositif de raccordement de porte-injecteur de moteur
US3845748A (en) * 1972-09-29 1974-11-05 Mack Trucks Fuel injection nozzle holder installation
IT1118657B (it) * 1979-05-23 1986-03-03 Fiat Veicoli Ind Testa cilindri di alluminio per motori diesel a precamera particolarmente per motori di tipo sovralimentato
DE4427717C1 (de) * 1994-08-05 1995-08-31 Daimler Benz Ag Hochdruckleitungsanschluß für einen Düsenhalter eines am Zylinderkopf einer Brennkraftmaschine befestigten Kraftstoffeinspritzventiles

Also Published As

Publication number Publication date
ES2168551T3 (es) 2002-06-16
IT1284691B1 (it) 1998-05-21
ITTO960635A1 (it) 1998-01-23
DE69708542D1 (de) 2002-01-10
EP0821155A1 (en) 1998-01-28
DE69708542T2 (de) 2002-07-18

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