EP0536091A1 - Dispositif de distribution et d'injection de combustible aux cylindres d'un moteur à combustion interne - Google Patents

Dispositif de distribution et d'injection de combustible aux cylindres d'un moteur à combustion interne Download PDF

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Publication number
EP0536091A1
EP0536091A1 EP92830511A EP92830511A EP0536091A1 EP 0536091 A1 EP0536091 A1 EP 0536091A1 EP 92830511 A EP92830511 A EP 92830511A EP 92830511 A EP92830511 A EP 92830511A EP 0536091 A1 EP0536091 A1 EP 0536091A1
Authority
EP
European Patent Office
Prior art keywords
main body
tubular core
primary tube
tubular
tailpieces
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Withdrawn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
EP92830511A
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German (de)
English (en)
Inventor
Giuseppe Baggioli
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.)
Individual
Original Assignee
Individual
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
Priority claimed from ITMI912591A external-priority patent/IT1251902B/it
Priority claimed from ITMI912590A external-priority patent/IT1251901B/it
Application filed by Individual filed Critical Individual
Publication of EP0536091A1 publication Critical patent/EP0536091A1/fr
Withdrawn legal-status Critical Current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
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/54—Arrangement of fuel pressure regulators

Definitions

  • the present invention relates to an apparatus for dispensing and injecting fuel to cylinders in endothermic engines, comprising: a dispensing manifold having a main body of elongated configuration, longitudinally travelled along by a primary tube and exhibiting, on opposite sides, an inlettailpiece and an outlet tailpiece passed through by a first and a second end tube respectively, connected with said primary tube; a plurality of injectors each exhibiting a feed port brought into fluid communication with the primary tube, and a delivery nozzle operatively engaged in a suction tube of an engine for admitting fuel thereto.
  • the dispensing manifold is substantially comprised of a main body extending parallelly to the alignment direction of the cylinders longitudinally passed throng by a primary the connected at the opposite ends therefof with an inlet and an outlet tailpiece in turn connected to a fuel delivery pipe and a fuel recirculation pipe, respectively.
  • Fuel is admitted to the primary tube through the inlet tailpiece and keeps a constant pressure checked by a pressure sensor located close to the outlet tailpiece.
  • a plurality of branching-off tailpieces projecting sideways from the main body carry out, through respective branching-off tubes, the forwarding to a corresponding injector co part of the fuel admitted to the primary tube.
  • the excess fuel amount admitted to the primary tube will leave the manifold through the outlet tailpiece, and will be subsequently recirculated.
  • the main body consists of a pipe on which, after appropriate mechanical machinings aiming at achieving side openings in communication with the primary tube defined within the pipe itself, a plurality of collars of tubular sections are weldeld, being designed to constitute the branching-off tailpieces for connection to the injectors.
  • the inlet and outlet tailpieces Connected still by welding to the opposite ends of the pipe forming the main body are the inlet and outlet tailpieces, as well as other possible tailpieces enabling connection of pressure and/or temperature sensors.
  • a cylindrical core designed to define said primary tube should be located within a mould provided with a cavity the shape of which matches the outer shape of the manifold. Subsequently, a melt metal is cast by dropping into the cavity of the previously closed mould, which metal will be subsequently solidified as a result of cooling. When solidification is over, concur- rentlywith the withdrawal of the semifinished product from the mould the cylindrical core is removed from the semifinished product itself in order to free the primary tube.
  • the semifinished product drawn out of the mould is already provided with the branching-off tailpieces and sometimes the inlet and outlet tailpieces formed at right angles to, and of one piece construction with, the main body.
  • the achievement of the finished manifold will also involve several finishing machinings substantially comprising boring of the different tubes, that is primary, branching-off, inlet and outlet tubes, machining of the ends of the branching-off, inlet and outlet tailpieces and of different seatings for receiving pressure and temperature sensors, as well as fluid-tight sealing of the primary tube at the respective opposite ends in order to isolate it from the surrounding atmosphere.
  • manifolds are made by means of several mechanical machinings involving material removal carried out on a semifinished product suitably preformed by a forging operation executed with the aid of a press, on a monolithic metal body made by extrusion or rolling.
  • the above manufacturing technique for manifolds is sometimes preferred to that involving melting by sand casting, in that the forged semifinished product offers better structural features and can be more easily machined, so that a greater efficiency and accuracy in making said tubes and tailpieces as well as said seatings for the engagement of sensors and/or fastening of the installed manifold can be achieved.
  • nechani- cal machinings on the forged product involve the removal of a great amount of material, due to the presence of important machining allowances resulting from the forging process. Therefore, as a result, costs are further increased.
  • the cost of the finished product is greatly increased by thy fact that boring over a great longitudinal extension is needed along the main body of the manifold so as to form the primary tube. This operation involves an important waste of time and the use of particular tools and technologies in that the value of the diameter- /length ratio of the bore to be carried out is very low.
  • the primary tube made by boring will always and inevitably emerge to the outside by at least one of its ends.
  • the fluid-tight seal made on said end in this case too will represent a point- of possible escape of fuel to the outside of the manifold.
  • the main object of the present invention is to solve the problems of the known art by providing an apparatus offering an improved use reliability, capable of eliminating any possibilities of exudation and leakage of fuel from the manifold, and also requiring a greatly reduced amount of material and reduced machining time, which will obviously bring about important savings on the costs of the feed apparatus as a whole.
  • an apparatus for dispensing and injecting fuel to cylinders in endothermic engines characterized in that the main body of the dispensing manifold comprises: a tubular core internally defining the primary tube and exhibiting a lower length than the overall length of the main body; an outer skirt completely covering the tubular core so as to hermetically isolate it from the surrounding, atmosphere; said injectors being connected with the primary tube by respective interconnecting openings, of substantially cylindrical configuration, each of which extends in the outer skirt amd at least partly penetrates the tubular core, so as to define therein at least one outflow port bringing the primary tube into fluid communication with the feed port exhibited by one of said injectors.
  • an apparatus for dispensing and injecting fuel to cylinders in endothermic engines in accordance with the present invention has been generally identified by reference numeral 1.
  • apparatus 1 essentially comprises a dispensing manifold 2 having a main body 3 designed to be fastened close to the head of an engine, at a appropriate location.
  • the main body 3 is longitudinally crossed by a primary tube 4 exhibiting first and second ends 4a, 4b connected with a first and a second end duct, 5 and 6 respectively.
  • Such end ducts 5, 6 are respectively formed within an inlet tailpiece 7 and an outlet tailpiece 8, integral with the main body 3 and preferably directed at right angles thereto.
  • the inlet tailpiece 7 is adapted to be sealingly connected in a conventional nanner wit a delivery pipe 10 (only shown in Figs. 2 and 7) that, in known manner, is constantly supplied with fuel under pressure drawn from a tank by a pump (both not shown as known and conventional).
  • the outlet tailpiece 8 is in turn sealingly connected with a recirculation pipe 11 (Figs. 2 and 8) through which excess fuel admitted to the manifold 2 is sent back to said tank.
  • a variable amount of fuel is sent to the recirculation pipe 11, being controlled by a conventional pressure-adjusting device 12 that, by reducing the fuel passage towards the outlet tailpiece 8 and/or acting upon the fuel pump, keeps fuel in the primary tube 4 to a given feed pressure value.
  • apparatus 1 further comprises a plurality of injectors 13 (not shown in Figs. 6, 7 and 8) distributed along the main body 3 of the manifold 2 spaced apart a given distance from each other and each exhibiting a feed port 14 arranged to be connected with the primary tube 4 so as to admit fuel to the injector.
  • injectors 13 are connected to an electronic control box, not shown as known per se, by means of cables.
  • the control box drives the injectors in operation such as to cause the sequential delivery of the fuel, at a controlled mete- rirng amount, via respective delivery nozzles 16 operatively engaged to respective suction tubes 17 (Figs 5, 9 and 10) each connected to one of the cylinders of an engine.
  • arrow "A" shows the direction of the air flow sucked into the engine.
  • the main body 3 is advantageously comprised of a tubular core 18 defining said primary tube 4 at the inside thereof and is integrally incorporated into and covered by an outer skirt 19 die-cast around the core itself.
  • the inlet and outlet tailpieces 7 and 8 are produced, which are therefore of one piece construction with the skirt itself.
  • skirt die-casting carried out together with the accomplishment of the inlet and outlet tailpieces 7 and 8, it has been found that the best results can be achieved through the use of a technique known in the art as "squeeze casting".
  • squeeze casting a technique known in the art as "squeeze casting"
  • other types of die-casting processes can be used too, as welt as injection moulding methods involving the use of composite and/or technological polymer-based materials.
  • attachment brackets 23 may be manufactured, if necessary, advantageously of one piece construction with the skirt 19, so as to enable the manifold to be mounted to the appropriate engine, as well as seatings 24 designed to accommodate the pressure adjusting device 12 and/or heat sensors and others.
  • the tubular core 18 consists of an extruded metal section member exhiting a polygonal outer profile seen in cross section.
  • the core 18 can be advantageously provided with at least one locating wing 20.
  • the locating wing 20, also by virtue of the polygonal section of the tubular core 18, enables the tubular core to be strongly anchored to the inside of the skirt 19 and can also offer holding and/or locating seatings (not shown), which will enable the tubular core 18 to be easily handled and positioned within a mould in which the skirt die-casting will be carried out during the manufacturing operations.
  • tubular core 18 has a lower length than the main body 3 taken as a whole, so that the respective ends 18a, 18b are suitably spaced apart from the ends 3a, 3b of the main body 3, towards the inside of the skirt 19.
  • the core 18 is therefore completely separated from the surrounding atmosphere, due to the presence of the skirt 19 integrally surrounding it.
  • the first and second end tubes 5, 6 are formed directly within the inlet and outlet tailpieces 7 and 8, by boring for example, and cross the tubular core 18 perpendicularly, so that they are brought into communication with the primary tube 4.
  • the ends 18a, 18b of the tubular core 18 are provided with respective closing elements 34a, 34b, formed with added welding material for example, the function of which is substantially to prevent the melted material from entering the primary tube 4 during the skirt and inlet and outlet tailpiece manufacturing process.
  • a first and a second tubular extension 21, 22 departing from the opposite ends 18a, 18b of the tubular core 18, said extensions being incorporated in the inlet and outlet tailpieces 7 and 8 respectively, in order to define the first and second end tubes 5 and 6 thereof.
  • said inlet and outlet tailpieces 7, 8 are die-cast around the respective first and second tubular extensions 21, 22 simultaneously with the formation of the skirt 19 around the tubular core 18.
  • first and second tubularex- tensions 21, 22 are of one piece construction with the tubular core 18 and joined to the opposite ends 18a, 18b thereof at respective bending areas.
  • the tubular core 18 and respective extensions 21, 22 can be made by merely cutting to size and bending the above mentioned extruded section member.
  • tubular extensions 21, 22 may be made separately from the tubular core 18 and fastened to the respective ends 18a, 18b of said core by weldings, threaded connections or others.
  • weldings or threaded connections joining the extensions 21,22 to the tubular core 18 will be at all events incorporated into the die-cast material forming the skirt 19 and/or the inlet and outlet tailpieces 7 and 8, thus eliminating any risks of fuel leakage.
  • a plurality of interconnecting openings 26 of a substantially cylindrical configuration is provided along the main body 3, each of them being formed across the skirt 19 and penetrating the tubular core 18 at least partly so as to intersect the primary tube 4 in order to define at least one fuel-outflow port 27.
  • Each outflow port 27 puts the primary tube 4 into fluid communication with one of the injectors 13, via the respective interconnecting opening 26.
  • each injector 13 exhibits a cylindrical body 25 to be directly engaged with the corresponding interconnecting opening 26.
  • each injector 13 is provided with an anchoring flange 28 perimetrically projecting therefrom, to be fixedly engaged, by threaded elements 29 or the like, to a locating surface 30 formed on the skirt 19, at the interconnecting opening 26
  • the corresponding feed port 14 located sideways on the cylindrical body 25 breasts the outflow port 27 afforded by the tubular core 18.
  • First and second seal rings 31, 32 located at opposite positions with reference to the outflow and feed ports, 27 and 14 respectively, act between the skirt 19 and the anchoring flange 28 and, respectively, between one inner wall of the interconnecting opening 26 and the cylindrical body 25 of the injector 13, in order to ensure the hermetic sealing of the interconnecting opening with respect to the surrround- ing atmosphere.
  • the delivery nozzle 16 of the injector 13 faces the respective suction pipe 17 through a col- iar33 projecting coaxially with respect to the interconnecting opening 26.
  • the interconnecting openings 26 are connected to the injectors 13 by respective branching-off tailpieces 35 distributed along the main body 3 spaced apart a given distance from each other, each of them being longitudinally crossed by a branching-off tube 36 (Figs. 9, 10) arranged to bring the primary the 4 into communication with the feed port 14 (not shown) of the corresponding injector 13.
  • Each of the branching-off tailpieces 35 is fastened to the skirt 19 by threaded elements 37a acting across a connecting flange 37 carried by the branching-off tailpiece.
  • the flange 37 sealingly engages, upon interposition of a seal ring 38 or similar means, on the locating surface 30 formed on the skirt 19.
  • each branching-off tailpiece 35 with the corresponding injector 13 can be carried out through the interposition of a flexible tub- ularelement 39 of known type, the opposite ends 39a, 39b of which are sealingly engaged with one free end 35a of the branching-off tailpiece 35 and one connecting portion 13a incorporating the feed port 14 of the injector 13, respectively.
  • each branching-off tailpiece 35 is directly and sealingly engaged with the connecting portion 13a of the injector 13.
  • the interconnecting openings 26 can be already present on the raw semifinished product coming from the above specified die-casting process.
  • the tubular core 18 will extend at the inside of the interconnecting openings 26 and, for the achievement of the outflow ports 27, will undergo an appropriate material removal following boring operations carried out on the openings themselves formed during one of the subsequent working steps of the product.
  • one or more cavities may also be formed on the skirt 19, to be combined with corresponding outflow ports in order to enable the pressure adjusting device 12 and/or other sensors to be sealingly connected with the primary tube 4.
  • the present invention achieves important advantages.
  • the apparatus in question as compared to the known art, completely eliminates any risks of fire resulting from possible fuel leakages through crackings produced in weldments directly exposed to the atmosphere.
  • a drastic reduction in the possibilities of fuel escape is atso achieved due to the absence in the primary tube of unnecessary openings towards the atmosphere which openings in the known art needed to be closed by adding welding material or otherwise.
  • the primary tube extends exclusively within the tubular core and is in communication with the outer part of the manifold exclusively at the inlet and outlet tailpieces, where connection between pipes takes place with the aid of known seal means, widely tested and of great reliability.
  • tubular core for defining the main tube has also eliminated the necessity of carrying out perforations along the whole extension of the main body, which brings about time savings in workings and, as a result, reduced costs of the finished product.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP92830511A 1991-09-30 1992-09-22 Dispositif de distribution et d'injection de combustible aux cylindres d'un moteur à combustion interne Withdrawn EP0536091A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITMI912591A IT1251902B (it) 1991-09-30 1991-09-30 Dispositivo per la distribuzione e l'iniezione di carburante in cilindri di motori endotermici
ITMI912590A IT1251901B (it) 1991-09-30 1991-09-30 Collettore per la distribuzione di carburante in motori endotermici alimentati ad iniezione
ITMI912591 1991-09-30
ITMI912590 1991-09-30

Publications (1)

Publication Number Publication Date
EP0536091A1 true EP0536091A1 (fr) 1993-04-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92830511A Withdrawn EP0536091A1 (fr) 1991-09-30 1992-09-22 Dispositif de distribution et d'injection de combustible aux cylindres d'un moteur à combustion interne

Country Status (1)

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EP (1) EP0536091A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2701295A1 (fr) * 1993-02-05 1994-08-12 Sindra Sa Rampe d'injection de carburant et l'un de ses procédés de fabrication.
EP0661443A1 (fr) * 1993-12-20 1995-07-05 General Motors Corporation Système d'injection de combustible
EP0745767A2 (fr) * 1995-05-30 1996-12-04 Yamaha Hatsudoki Kabushiki Kaisha Moteur à combustion interne multicylindre à injection de carburant et méthode d'injection de carburant
EP0799989A1 (fr) * 1993-12-17 1997-10-08 General Motors Corporation Système d'admission d'air et de combustible
WO2021121826A1 (fr) * 2019-12-20 2021-06-24 Robert Bosch Gmbh Distributeur de fluide pour un système d'injection, en particulier un rail de distribution de carburant pour un système d'injection de carburant pour moteurs à combustion interne à allumage commandé à compression de mélange

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2024937A (en) * 1978-07-01 1980-01-16 Bosch Gmbh Robert Connecting fuel injectors to supply pipes
EP0132418A1 (fr) * 1983-06-21 1985-01-30 G. De Bruyn Ozoir S.A. Procédé de fabrication d'une rampe d'injection de carburant
US4836246A (en) * 1987-08-03 1989-06-06 Colt Industries Inc. Manifold for distributing a fluid and method for making same
US4964381A (en) * 1988-07-29 1990-10-23 Honda Giken Kogyo Kabushiki Kaisha Fuel injection features of a two-cycle engine for motorcycles
WO1990013741A1 (fr) * 1989-05-02 1990-11-15 Robert Bosch Gmbh Distributeur de carburant pour systemes d'injection dans des moteurs a combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2024937A (en) * 1978-07-01 1980-01-16 Bosch Gmbh Robert Connecting fuel injectors to supply pipes
EP0132418A1 (fr) * 1983-06-21 1985-01-30 G. De Bruyn Ozoir S.A. Procédé de fabrication d'une rampe d'injection de carburant
US4836246A (en) * 1987-08-03 1989-06-06 Colt Industries Inc. Manifold for distributing a fluid and method for making same
US4964381A (en) * 1988-07-29 1990-10-23 Honda Giken Kogyo Kabushiki Kaisha Fuel injection features of a two-cycle engine for motorcycles
WO1990013741A1 (fr) * 1989-05-02 1990-11-15 Robert Bosch Gmbh Distributeur de carburant pour systemes d'injection dans des moteurs a combustion interne

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2701295A1 (fr) * 1993-02-05 1994-08-12 Sindra Sa Rampe d'injection de carburant et l'un de ses procédés de fabrication.
EP0799989A1 (fr) * 1993-12-17 1997-10-08 General Motors Corporation Système d'admission d'air et de combustible
EP0661443A1 (fr) * 1993-12-20 1995-07-05 General Motors Corporation Système d'injection de combustible
EP0745767A2 (fr) * 1995-05-30 1996-12-04 Yamaha Hatsudoki Kabushiki Kaisha Moteur à combustion interne multicylindre à injection de carburant et méthode d'injection de carburant
EP0745767A3 (fr) * 1995-05-30 1997-11-12 Yamaha Hatsudoki Kabushiki Kaisha Moteur à combustion interne multicylindre à injection de carburant et méthode d'injection de carburant
WO2021121826A1 (fr) * 2019-12-20 2021-06-24 Robert Bosch Gmbh Distributeur de fluide pour un système d'injection, en particulier un rail de distribution de carburant pour un système d'injection de carburant pour moteurs à combustion interne à allumage commandé à compression de mélange
JP2023507217A (ja) * 2019-12-20 2023-02-21 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 噴射装置用の流体分配器、特に、混合気圧縮型の火花点火式内燃機関の燃料噴射装置用の燃料分配レール
US12044198B2 (en) 2019-12-20 2024-07-23 Robert Bosch Gmbh Fluid distributor for an injection system, in particular, fuel distributor rail for a fuel injection system for mixture-compressing, spark ignition internal combustion engines

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