EP2775133A1 - Un moyen de protection pour une buse d'injecteur - Google Patents

Un moyen de protection pour une buse d'injecteur Download PDF

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Publication number
EP2775133A1
EP2775133A1 EP13158032.6A EP13158032A EP2775133A1 EP 2775133 A1 EP2775133 A1 EP 2775133A1 EP 13158032 A EP13158032 A EP 13158032A EP 2775133 A1 EP2775133 A1 EP 2775133A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
mean
injector
protection
combustion chamber
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Withdrawn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
EP13158032.6A
Other languages
German (de)
English (en)
Inventor
Walter Piock
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.)
BorgWarner Luxembourg Automotive Systems SA
Original Assignee
Delphi Automotive Systems Luxembourg 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 Delphi Automotive Systems Luxembourg SA filed Critical Delphi Automotive Systems Luxembourg SA
Priority to EP13158032.6A priority Critical patent/EP2775133A1/fr
Publication of EP2775133A1 publication Critical patent/EP2775133A1/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Withdrawn legal-status Critical Current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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles

Definitions

  • the present invention relates generally to a fuel injector and a protection mean preventing soot deposit on its nozzle.
  • a direct injection engine has adopted a configuration in which a fuel multi-port injector is mounted into a mounting port in a cylinder head, and fuel is injected directly into a cylinder from a nozzle at the tip of this fuel injector. After the injection, the nozzle closes as a pintle inside the body of the injector axially translates and abuts against the inner face of the nozzle. A minor quantity of liquid fuel remains captured in the continuous volume defined by the injection ports connected to the volume, known as the sac volume, which is inside the injector under the extremity of the pintle. In the chamber motions of gas occurs in the chamber resulting from pressure differences between various zones of the chamber. The nozzle is then laterally hit by some gas.
  • the nozzle has a luv side, hit by the burned gas, and an opposite lee side. Consequently the liquid fuel present in the ports opening on the luv side is pushed back in toward the sac volume and, consequently, some unburned liquid fuel exits from the ports opening on the lee side, said fuel settling on the nozzle.
  • This fuel oxidises in an oxygen-poor environment leaving some amounts of soot clinging to the nozzle. With the multitude of such events the soot then accumulates and forms a deposit layer on the nozzle which, in turn allows more fuel to be deposited in there. This accumulation of soot goes against an optimum operation mode of the engine.
  • the present invention aims at solving the above mentioned problem.
  • a protection mean for the nozzle of a multi-port fuel injector axially arranged in the mounting bore of the cylinder head of a direct injection combustion engine.
  • the bore opens in a combustion chamber, the tip point of the injector being its nozzle set to deliver pressurized fuel in the combustion chamber.
  • the protection mean axially extends beyond the nozzle to prevent said nozzle from being in direct contact with lateral gas motions created by pressure differences occurring inside the combustion chamber.
  • the protection mean is a shielding wall extending inside the combustion chamber and providing a protection to the nozzle of the injector.
  • the shielding wall is a cylindrical tube arranged around the nozzle.
  • the cylindrical tube may have a circular section.
  • the protection mean can be a standalone component arranged and fixed to the cylinder head for instance in the mounting bore, or fixed to the injector.
  • the protection mean can be integral with the injector body and can extend beyond the nozzle in order to surround it and protect it.
  • the protection mean may be integral with the cylinder head extending inside the combustion chamber so that when the injector is arranged in the mounting bore, the protection mean surrounds and protects its nozzle.
  • the protection axially extends beyond the tip point of the injector by a distance 0.1 to 5 mm. I a preferred embodiment the extension is limited to 2 to 3 mm.
  • the injector can be entirely arranged inside the mounting bore, the protection mean being the final section of the bore which axially extends beyond the nozzle into the combustion chamber.
  • the invention is also related to a fuel injector for a direct injection combustion engine, the injector comprising a protection mean for its nozzle from being in direct contact with lateral gas motions created by pressure differences occurring inside the combustion chamber.
  • the protection mean is as previously described.
  • the invention is further related to an internal combustion engine provided with a fuel injector which nozzle is protected by a protection mean as previously described.
  • an in-cylinder type gasoline engine 10 is provided with an in-cylinder multi-port fuel injector 12 according to a preferred embodiment of the present invention.
  • An internal combustion engine (gasoline engine) 10 is mainly composed of a cylinder block (not shown) and a cylinder head 14.
  • the cylinder head 14 has a mounting bore 16 which extends into a combustion chamber 18 along a main axis X.
  • main axis X will be orientated vertically from the bottom to the top, which corresponds to the orientation of the figures, without limiting purpose.
  • the fuel injector body 20 is axially inserted in the mounting bore 16, the tip portion 22 of the fuel injector 12, which comprises a nozzle 24, extending toward the combustion chamber 18. Inside its body 20, the fuel injector 12 comprises a pintle 26 which is axially reciprocally movable in order to control opening and closing of the nozzle 24.
  • the tip portion 22 of the injector has a tubular shape closed at its lower end by a transversal wall 28 that axially deflects toward the chamber 18 in a conical shape 30.
  • the deflection 30 is provided with a plurality of ports 32 enabling the pressurized fuel to be expelled from the inside of the injector body 20 to the combustion chamber 18.
  • the pintle 26 has a spherical extremity 34 that closes the nozzle 24 by abutting against the inner face of the deflection 30 along a circular closed line 36 set above the ports 32.
  • a volume defined by the ports 32 and a sac volume 38 keeps captured a small quantity of liquid fuel.
  • the sac volume 38 is defined as the small volume which is below the spherical extremity 34 and the inner tip of the deflection 30.
  • Alternative geometries of the pintle and deflection exist and can benefit from the present invention.
  • the injector body 20 axially extends beyond the nozzle 24 in a tubular cylinder 40 that surrounds the nozzle 24.
  • the cylinder 40 provides a protection mean for the nozzle 24 so that it is not in direct contact with said lateral gas motion A.
  • the nozzle 40 is substantially flush with the inner face of the combustion chamber 18.
  • the protection mean 40 extends inside de combustion chamber 18 on a distance D that can be up to 5 mm. In a preferred embodiment the distance D is from 2 to 3 mm. According to the preferred embodiment just described, the protection mean 40 is integral to the injector body 20.
  • the protection mean 40 is a standalone component fixed in the wall of the chamber 18, for instance partially inserted in the mounting bore and partially extending out in the chamber.
  • the mean is integral to the cylinder head and arranged so that when the injector is set, the protection mean protects the nozzle.
  • the protection mean 40 previously described as a cylinder tube can be given other shapes according to the in-cylinder design and to the resulting gas motions.
  • the portion extending in the combustion chamber 18 may be a portion of cylinder or a simple flat wall protecting just one side of the injector. This may be sufficient to protect the nozzle 24 from being in direct contact with said lateral gas motion F.
  • Another protection mean 40 for the nozzle 40 may be provided by the mounting bore 16 itself.
  • the fuel injector 12 is arranged back inside the bore 16 leaving free a final section 42 of the bore, section extending from the tip of the injector 22 to the opening of the bore 16 in the combustion chamber 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP13158032.6A 2013-03-06 2013-03-06 Un moyen de protection pour une buse d'injecteur Withdrawn EP2775133A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13158032.6A EP2775133A1 (fr) 2013-03-06 2013-03-06 Un moyen de protection pour une buse d'injecteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13158032.6A EP2775133A1 (fr) 2013-03-06 2013-03-06 Un moyen de protection pour une buse d'injecteur

Publications (1)

Publication Number Publication Date
EP2775133A1 true EP2775133A1 (fr) 2014-09-10

Family

ID=47844135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13158032.6A Withdrawn EP2775133A1 (fr) 2013-03-06 2013-03-06 Un moyen de protection pour une buse d'injecteur

Country Status (1)

Country Link
EP (1) EP2775133A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016082986A3 (fr) * 2014-11-28 2016-07-28 Robert Bosch Gmbh Injecteur de gaz à propriétes thermiques améliorées

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003003930A (ja) * 2001-06-20 2003-01-08 Denso Corp 燃料噴射弁
WO2003002867A1 (fr) * 2001-06-26 2003-01-09 Robert Bosch Gmbh Soupape d'injection de carburant
EP1398497A2 (fr) * 2002-07-29 2004-03-17 Denso Corporation Injecteur avec un disque perfore d'injection
WO2007058103A1 (fr) * 2005-11-16 2007-05-24 Toyota Jidosha Kabushiki Kaisha Soupape d’injection de carburant
JP2011085021A (ja) * 2009-10-13 2011-04-28 Mitsubishi Electric Corp 燃料噴射弁

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003003930A (ja) * 2001-06-20 2003-01-08 Denso Corp 燃料噴射弁
WO2003002867A1 (fr) * 2001-06-26 2003-01-09 Robert Bosch Gmbh Soupape d'injection de carburant
EP1398497A2 (fr) * 2002-07-29 2004-03-17 Denso Corporation Injecteur avec un disque perfore d'injection
WO2007058103A1 (fr) * 2005-11-16 2007-05-24 Toyota Jidosha Kabushiki Kaisha Soupape d’injection de carburant
JP2011085021A (ja) * 2009-10-13 2011-04-28 Mitsubishi Electric Corp 燃料噴射弁

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016082986A3 (fr) * 2014-11-28 2016-07-28 Robert Bosch Gmbh Injecteur de gaz à propriétes thermiques améliorées

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