WO1994011631A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
WO1994011631A1
WO1994011631A1 PCT/GB1993/002232 GB9302232W WO9411631A1 WO 1994011631 A1 WO1994011631 A1 WO 1994011631A1 GB 9302232 W GB9302232 W GB 9302232W WO 9411631 A1 WO9411631 A1 WO 9411631A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
valve member
projection
opening
seating
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.)
Ceased
Application number
PCT/GB1993/002232
Other languages
English (en)
Inventor
Jett Raymond Black
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of WO1994011631A1 publication Critical patent/WO1994011631A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F02M61/06—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 being furnished at seated ends with pintle or plug shaped extensions

Definitions

  • This invention relates to a fuel injection nozzle of the so called pintle type, for supplying fuel to a compression ignition engine and comprising a nozzle body in which is defined a blind bore, an annular seating defined at the blind end of the bore, the seating surrounding an outlet opening which extends to the exterior of the nozzle body, a fuel pressure actuated valve member slidable within the bore and shaped for cooperation with the seating to prevent the flow of fuel through the opening from a fuel inlet communicating with the bore, and a projection on the valve member, the projection extending through the opening at least in the closed position of the valve member.
  • Such nozzles are well known in the art and the projection is shaped so that the area of the fuel flow path defined between the projection and the wall of the opening varies as the valve member is lifted from the seating.
  • the fuel which flows along the flow path enters a combustion chamber of the associated engine as a spray and after a short period combustion of the fuel commences. This period is known in the art as the "ignition delay period”. Following the initiation of combustion, combustion spreads rapidly throughout the combustion chamber giving a rapid rise in the pressure within the combustion chamber. The rapid rise of pressure can result in the so called “diesel knock”.
  • valves in the fuel supply line to the nozzle.
  • the purpose of the valve or valves is to allow delivery of a pilot quantity of fuel and then to interrupt the flow of fuel to allow combustion of the fuel to commence and then to allow delivery of the main quantity of fuel into the flame already established in the combustion chamber.
  • Fuel systems employing such valves have not proved satisfactory and a more recent solution has been to provide nozzles in which the valve member has two stages of lift.
  • Such nozzles provide for a reduced initial rate of fuel flow into the combustion chamber, the rate of flow increasing as the valve member moves through its second stage of lift.
  • Such nozzles are finding increased application but they are expensive to produce and require careful adjustment during manufacture to ensure the desired initial rate of fuel flow.
  • the reduced initial rate of flow of fuel whilst being beneficial from the point of view of engine noise may result in the prolongation of the "ignition delay period”.
  • the object of the present invention is to provide a fuel injection nozzle of the kind specified in a simple and convenient form.
  • a fuel injection nozzle of the kind specified there is provided on the projection, a notch which during the initial movement of the valve member away from the seating provides a flow path for fuel, the downstream end of the notch being covered by the wall of the opening after a predetermined movement of the valve member away from the seating, the arrangement being such that the notch provides for a relatively high initial flow of fuel at the start of the lift of the valve member away from it seating, the rate of flow of fuel then diminishing to a level determined by a clearance between the projection and the wall of the opening.
  • Figure 1 is a part sectional side elevation of the complete nozzle
  • Figure 2 is a view to an enlarged scale of part of the valve member seen in Figure 1 .
  • Figure 3 is a view similar to Figure 2 but taken at right angles thereto.
  • the fuel injection nozzle 10 comprises a nozzle body 1 1 which is secured to a nozzle holder 12 with a distance piece 13 interposed therebetween.
  • the nozzle body is provided with a flange which is engaged by a cap nut 14 which is in screw thread engagement with the holder.
  • Formed in the nozzle body is a blind bore 15 which at its blind end is enlarged to define a fuel inlet chamber 16 which is located upstream of a seating 17 which is located about an outlet opening 18 which extends to the exterior of the nozzle body.
  • valve member 19 Slidable within the bore 15 is a valve member 19 which within the inlet chamber 16, is tapered to a cylindrical portion 20 which as more clearly seen in Figures 2 and 3, is machined for cooperation with the seating 17.
  • the valve member is provided with a projection 21 which will be described in greater detail, and which extends in the closed position of the valve member, through the opening 18.
  • the reduced end portion of the valve member extends from the bore 15 and is engaged by a spring abutment 22 against which is located one end of a coiled compression spring 23.
  • the spring is located in a chamber 24 formed in the holder 12 and the chamber 24 is in the use of the nozzle, connected to a drain by way of an outlet 25.
  • the reduced end portion of the valve member together with a portion of the spring abutment, pass through an opening 26 formed in the distance piece 13 and the inlet chamber 16 communicates with a fuel inlet 27 formed on the holder by way of passages not shown, in the holder, the distance piece and the nozzle body.
  • the fuel inlet 27 is connected to the outlet of a high pressure fuel injection pump and the pressure of fuel delivered by the pump acts upon the valve member to urge the valve member against the action of the spring 23, away from the seating 17.
  • the projection 21 includes a first portion 28 which is of cylindrical form and substantially constant diameter but merged with the remaining portion of the valve member downstream of the frusto conical portion 29 which is formed as a result of the valve member being shaped for cooperation with the seating.
  • the cylindrical portion 28 extends in the closed position of the valve member as shown, to more or less the exterior surface of the nozzle body about the opening 18.
  • the projection continues with a tapered portion 30 and this is followed by two further tapered portions 31 and 32, the portion 31 being tapered to a greater extent than the portion 30 as also is the portion 32.
  • the cylindrical portion 28 forms a small working clearance with the wall of the opening 18 so that during the initial movement of the valve member away from the seating there would be a small but inadequate flow of fuel through the opening with the flow increasing as the portion 30 passes through the opening.
  • a notch 33 which as will be seen from Figure 3, forms with the wall of the opening 18 a flow path for fuel as soon as the valve member is lifted from its seating.
  • the initial flow of fuel which is allowed by the provision of the notch 33, quickly conditions the combustion chamber to establish combustion and ensures a short ignition delay period, before the main quantity of fuel is delivered to the combustion chamber as the valve member moves towards its fully open position.
  • the initial rate of rise of pressure within the combustion chamber is therefore relatively low so that engine noise is minimised and in addition, exhaust emissions in the form of NOx are minimised.

Landscapes

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

Abstract

Injecteur de carburant du type à têton comprenant une partie saillante (21) formée sur l'élément (19) de soupape. La partie saillante présente une partie cylindrique (28) qui forme un petit espace de travail avec la paroi d'un orifice (18) de sortie. La partie cylindrique est suivie d'une partie rétrécie (30) et une encoche (33) est formée sur la partie cylindrique et la partie adjacente de la partie rétrécie, cette encoche permettant au carburant de s'écouler vers le moteur lorsque l'élément de soupape commence à s'ouvrir. L'écoulement du carburant le long de l'encoche s'arrête dès qu'un autre mouvement se produit et l'écoulement de carburant est alors régulé par la partie rétrécie de la partie saillante.
PCT/GB1993/002232 1992-11-13 1993-10-29 Injecteur de carburant Ceased WO1994011631A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9223786.6 1992-11-13
GB929223786A GB9223786D0 (en) 1992-11-13 1992-11-13 Fuel injection nozzle

Publications (1)

Publication Number Publication Date
WO1994011631A1 true WO1994011631A1 (fr) 1994-05-26

Family

ID=10725010

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/002232 Ceased WO1994011631A1 (fr) 1992-11-13 1993-10-29 Injecteur de carburant

Country Status (2)

Country Link
GB (1) GB9223786D0 (fr)
WO (1) WO1994011631A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2227225C1 (ru) * 2002-09-17 2004-04-20 Азово-Черноморская государственная агроинженерная академия Распылитель форсунки для дизельного двигателя внутреннего сгорания (двс)
RU2395709C2 (ru) * 2008-04-22 2010-07-27 Федеральное государственное образовательное учреждение высшего профессионального образования "Азово-Черноморская государственная агроинженерная академия" (ФГОУ ВПО АЧГАА) Распылитель форсунки для дизельного двигателя внутреннего сгорания

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE855486C (de) * 1941-10-09 1952-11-13 Bosch Gmbh Robert Einspritzventil fuer Brennkraftmaschinen
GB722161A (en) * 1951-09-27 1955-01-19 Daimler Benz Ag Improvements relating to fuel injection devices for internal combustion engines
DE927183C (de) * 1942-02-10 1955-05-02 Daimler Benz Ag Vorkammer-Einspritzbrennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE855486C (de) * 1941-10-09 1952-11-13 Bosch Gmbh Robert Einspritzventil fuer Brennkraftmaschinen
DE927183C (de) * 1942-02-10 1955-05-02 Daimler Benz Ag Vorkammer-Einspritzbrennkraftmaschine
GB722161A (en) * 1951-09-27 1955-01-19 Daimler Benz Ag Improvements relating to fuel injection devices for internal combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2227225C1 (ru) * 2002-09-17 2004-04-20 Азово-Черноморская государственная агроинженерная академия Распылитель форсунки для дизельного двигателя внутреннего сгорания (двс)
RU2395709C2 (ru) * 2008-04-22 2010-07-27 Федеральное государственное образовательное учреждение высшего профессионального образования "Азово-Черноморская государственная агроинженерная академия" (ФГОУ ВПО АЧГАА) Распылитель форсунки для дизельного двигателя внутреннего сгорания

Also Published As

Publication number Publication date
GB9223786D0 (en) 1993-01-06

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