EP0361359A1 - A multi-nozzle injector for an internal combustion engine - Google Patents

A multi-nozzle injector for an internal combustion engine Download PDF

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Publication number
EP0361359A1
EP0361359A1 EP89117661A EP89117661A EP0361359A1 EP 0361359 A1 EP0361359 A1 EP 0361359A1 EP 89117661 A EP89117661 A EP 89117661A EP 89117661 A EP89117661 A EP 89117661A EP 0361359 A1 EP0361359 A1 EP 0361359A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
fact
valve seat
injector
insert element
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.)
Withdrawn
Application number
EP89117661A
Other languages
German (de)
English (en)
French (fr)
Inventor
Edoardo Barbera
Walter Giraudi
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto 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 Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0361359A1 publication Critical patent/EP0361359A1/en
Withdrawn legal-status Critical Current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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates

Definitions

  • the present invention relates to a multi-nozzle injector with orientated jets, in particular for an internal combustion engine of the type having two inlet valves for each cylinder, adapted to be disposed straddling two or more different adjacent inlet ducts of a heat engine for injecting fuel simultaneously into them.
  • Injectors of the type described have the purpose of optimising the ratio of the mixture (that is the ratio between the flow rate by weight of inlet air and flow rate by weight of fuel) in the various operating conditions of the engine, and are known from US Patent 2,995,123; they allow a high specific power to be obtained with reduced fuel consumption and low emission of pollutants, but also have several disadvantages, among which are a certain constructional complexity, manufacturing difficulty in forming the injection nozzles, and the necessity of changing the entire body of the injector for mounting on different engines, due to the necessity of modifying the dimensions and orientation of the nozzles, which are typical for each particular engine model, that is for each possible combination between cylinder capacity and specific power of the engine.
  • the object of the invention is that of providing a multi-­ nozzle injector of the type specified above, which will be of particularly simple construction and relatively economical to produce.
  • a multi-nozzle injector for an internal combustion engine comprising a hollow body provided with a supply connector for fuel under pressure and valve means for the injection and metering of the fuel, including a shutter member movable axially within the hollow body and a valve seat cooperating in a fluid-tight manner with the shutter member, characterised by the fact that the valve means further include at least one pair of nozzles hydraulically connected with the valve seat through a common calibrated duct able to meter the flow of fuel passing from the said valve seat towards the said nozzles.
  • the reference numeral 1 indicates a multi-nozzle fuel injector for an internal combustion engine 2 of known type of which, for simplicity, only a cylinder 3 provided with a pair of inlet valves 4 and a part of the cylinder head 5 provided with a pair of ducts or adjacent inlet manifolds 6, supplying the valves 4 are illustrated in a schematic manner; in particular, the injector 1 is mounted symmetrically straddling the ducts 6 and is an electrically operated injector, that is to say it is of the known electromagnetically operated type.
  • the injector 1 includes a casing 10 provided with an electrical connector pin 11 of known type, a hollow tubular body 12 provided at its upper end close to the pin 11 with a connector 13 for the supply of fuel 14 under pressure, for example petrol or diesel oil, and valve means for the injection and metering of fuel 14, generally indicated 15, housed within a terminal sleeve shaped lower end 16 of the hollow body 12;
  • the valve means 6 include a shutter member 18 movable axially within the hollow body 12, in which is housed a substantially coaxial valve seat 19 cooperating in a fluid-tight manner with the shutter member 18, and a plurality of injection nozzles 20, two in the illustrated example, adapted to permit the ejection of jets of fuel 14 under pressure from the interior of the hollow body 12 when the shutter member 18 is spaced from the valve seat 19; in the example the shutter member 18 is normally maintained, in a known manner, for example by means of a spring not illustrated, in cooperation with the valve seat 19 in such a way as to maintain the hollow body 12 sealed in a
  • the so called injection phase it is known that the quantity of fuel injected into the ducts 6 and, therefore, the mixture ratio obtainable during the induction stroke of the engine 2, depends on the time for which the valve means 15 are open (that is the time during which the shutter 18 remains spaced from the seat 19) and on the flow cross-section thereby made available to the fuel; in known injectors this flow cross-section is usually determined by the diameter of the nozzles 20, which are constituted by holes having calibrated dimensions.
  • the nozzles 20 are defined by simple holes formed without strict tolerances, having purely the purpose of guiding the fuel jet 14 during the injection, whilst the metering of the jet (or, in the case in question, the jets, there being more than one nozzle 20) is effected by a rectilinear calibrated duct 21 formed coaxially with the shutter 18, which is common for both nozzles 20 and hydraulically connects them with the interior of the valve seat 19.
  • the shutter 18 comprises a hollow stem 22 and a plate 23 fixed onto the tip of the stem 22 (for example by crimping) and adapted to cooperate frontally with the seat 19, which is of known type, defined by a depression 23 provided peripherally of a sealing edge 24 ( Figure 2) against which the plate 23 is normally pressed.
  • the valve seat 19 and the calibrated duct 21 are formed in a substantially cylindrical element 30 the upper face of which defines a bottom wall 31 of the hollow body 12.
  • the nozzles 20 are formed in an insert 32 fixedly secured within the interior of a frontal recess 33 formed on a lower face 35 of the element 30, opposite the face 31 and the associated valve seat 19, and facing outwardly of the body 12;
  • the calibrated duct 21 is formed in the element 30 in such a way as to open into the recess 33 in correspondence with a space 36 ( Figure 2) where the two nozzles 20 are hydraulically connected; these latter are formed in such a way as to diverge from one another starting from the hydraulic connection region 36 between them, which is defined by respective common ends of the nozzles 20 themselves which mutually intersect.
  • the recess 33 in the element 30 comprises a cylindrical seat 38 within which the insert 32 is fixedly housed (for example by an interference fit), and a flared mouth 39 facing the outer surface 35 and defining a chamber into which the nozzles 20 open, in the non-limitative example illustrated they have a divergence angle substantially identical with the flare angle of the mouth or chamber 39, that is to say having a substantially frustoconical form with the same cone angle.
  • the sleeve-like end 16 housing the valve means 15 includes a seat 40 for sealingly receiving the element 30 provided with an axial shoulder 41 and a plastically deformable peripheral rim 42 which is clenched against a bevelled front edge 43 of the element 30 to retain this latter in position against the axial shoulder 41 with the interposition, between the shoulder 41 and the element 30, of a spacer ring 45 of known type, preferably of calibrated thickness, that is having a predetermined highly precise dimension.
  • a spacer ring 45 of known type, preferably of calibrated thickness, that is having a predetermined highly precise dimension.
  • the insert 32 preferably has cylindrical symmetry and includes a first cylindrical abutment 50 of greater diameter, adapted to be inserted coaxially within the seat 38 to ensure fixing of the insert 32 to the element 30, and a second cylindrical abutment 51, of smaller diameter, projecting axially from the first abutment 50 into the mouth or chamber 39 and terminating with a conical frontal surface 52 in correspondence with which the nozzles 20 open into the chamber 39; on the other hand, the hydraulic connection space 36 between the nozzles 20 and the calibrated duct 21 is formed in correspondence with a flat surface 53 opposite the surface 52 and frontally delimiting the abutment 50, which is adapted to contact against the bottom of the seat 38.
  • the cylindrical abutment 51 finally has a lateral milling 55 for precise angular reference with respect to the holes 20.
  • the function of regulation of the rate of flow of fuel to be injected, rather than being performed directly by the nozzles 20 or, as in other known constructions, by the opening left free between the seat 19 and the shutter 18 when this latter is actuated in a known way by the said known and not illustrated electromagnet, is performed by an independent element which can be made easily (being rectilinear and coaxial with the shutter 18) such as the calibrated duct 21; the fact that this is formed, rather than directly in the body of the injector, on an insert element which is easily mounted and replaced, then permits, on the one hand the calibrated duct 21 to be formed even more easily, and on the other to adapt the same injector 1 to engines requiring different fuel/air mixture ratios simply by substituting the element 30 with another of identical external dimensions in such a way as perfectly to adapt to the seat 40, but having a calibrated hole 21 of different diameter.
  • a further constructional advantage finally derives from the fact that the inclined nozzles 20, rather than being formed in the said element provided with the calibrated hole 21, are also formed on a separate insert, that is the insert 32, which is then fixed within the element 30; this on the one hand facilitates the production of the nozzles 20, which can be made as through holes, rather than as blind holes, and on the other hand further increases the flexibility of the structure of the injector 1; it is in fact evident that if it is desired to serve different engines, in which the fuel 14 must be injected in different directions, the same injector 1 can still be used, simply by substituting the insert 32 with another identical apart from the position and inclination of the holes 20.
  • the manner of fixing of the element 30 and the insert 32 can be of any different form, and the nozzles 20 can be present in any number and in any configuration, for example asymmetric, with a hole 20 disposed axially of the duct 21 and one or more holes 20 formed at an angle on one side of the first, according to the configuration of the induction ducts 6 of the engine 2 on which the injector 1 is to be mounted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP89117661A 1988-09-27 1989-09-25 A multi-nozzle injector for an internal combustion engine Withdrawn EP0361359A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT5342188U 1988-09-27
IT5342188U IT215076Z2 (it) 1988-09-27 1988-09-27 Iniettore pluriugello per un motore a combustione interna

Publications (1)

Publication Number Publication Date
EP0361359A1 true EP0361359A1 (en) 1990-04-04

Family

ID=11282601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117661A Withdrawn EP0361359A1 (en) 1988-09-27 1989-09-25 A multi-nozzle injector for an internal combustion engine

Country Status (2)

Country Link
EP (1) EP0361359A1 (it)
IT (1) IT215076Z2 (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237065A (en) * 1989-10-17 1991-04-24 Weber Srl Electromagnetic i.c. engine fuel injector outlet
GB2296039A (en) * 1994-12-16 1996-06-19 Perkins Ltd Stress reduction at a high pressure fluid passage junction
EP1138936A3 (en) * 2000-03-30 2002-03-06 Siemens Automotive Corporation Deposit resistant material for a fuel injection seat and method of manufacturing
WO2017114634A1 (de) * 2015-12-29 2017-07-06 Robert Bosch Gmbh Brennstoffeinspritzventil
CN114060722A (zh) * 2021-11-17 2022-02-18 无锡隆盛科技股份有限公司 一种喷嘴生产过程中的流量闭环控制调节方法
EP4187072A1 (en) * 2021-11-26 2023-05-31 Ansaldo Energia Switzerland AG Fuel oil injector and method of controlling a fuel oil injector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355175A1 (fr) * 1976-06-17 1978-01-13 Bendix Corp Organe de division de combustible perfectionne pour soupapes d'injection de combustible
DE3229716A1 (de) * 1982-08-10 1984-02-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffversorgungsanlage
US4657189A (en) * 1985-03-13 1987-04-14 Aisan Kogyo Kabushiki Kaisha Electromagnetic fuel injection valve for an internal combustion engine having a plurality of intake valves
EP0242978A1 (en) * 1986-04-24 1987-10-28 General Motors Corporation Dual spray cone electromagnetic fuel injector
EP0257475A2 (en) * 1986-08-21 1988-03-02 Nippondenso Co., Ltd. A fuel injection valve assembly and an assembling method therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355175A1 (fr) * 1976-06-17 1978-01-13 Bendix Corp Organe de division de combustible perfectionne pour soupapes d'injection de combustible
DE3229716A1 (de) * 1982-08-10 1984-02-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffversorgungsanlage
US4657189A (en) * 1985-03-13 1987-04-14 Aisan Kogyo Kabushiki Kaisha Electromagnetic fuel injection valve for an internal combustion engine having a plurality of intake valves
EP0242978A1 (en) * 1986-04-24 1987-10-28 General Motors Corporation Dual spray cone electromagnetic fuel injector
EP0257475A2 (en) * 1986-08-21 1988-03-02 Nippondenso Co., Ltd. A fuel injection valve assembly and an assembling method therefor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237065A (en) * 1989-10-17 1991-04-24 Weber Srl Electromagnetic i.c. engine fuel injector outlet
GB2296039A (en) * 1994-12-16 1996-06-19 Perkins Ltd Stress reduction at a high pressure fluid passage junction
EP1138936A3 (en) * 2000-03-30 2002-03-06 Siemens Automotive Corporation Deposit resistant material for a fuel injection seat and method of manufacturing
WO2017114634A1 (de) * 2015-12-29 2017-07-06 Robert Bosch Gmbh Brennstoffeinspritzventil
CN108431400A (zh) * 2015-12-29 2018-08-21 罗伯特·博世有限公司 燃料喷射阀
CN114060722A (zh) * 2021-11-17 2022-02-18 无锡隆盛科技股份有限公司 一种喷嘴生产过程中的流量闭环控制调节方法
CN114060722B (zh) * 2021-11-17 2023-09-01 无锡隆盛科技股份有限公司 一种喷嘴生产过程中的流量闭环控制调节方法
EP4187072A1 (en) * 2021-11-26 2023-05-31 Ansaldo Energia Switzerland AG Fuel oil injector and method of controlling a fuel oil injector

Also Published As

Publication number Publication date
IT215076Z2 (it) 1990-07-30
IT8853421V0 (it) 1988-09-27

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