EP2525077A1 - Buse - Google Patents

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Publication number
EP2525077A1
EP2525077A1 EP20120003561 EP12003561A EP2525077A1 EP 2525077 A1 EP2525077 A1 EP 2525077A1 EP 20120003561 EP20120003561 EP 20120003561 EP 12003561 A EP12003561 A EP 12003561A EP 2525077 A1 EP2525077 A1 EP 2525077A1
Authority
EP
European Patent Office
Prior art keywords
hole
injection
seat
nozzle
blind hole
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.)
Granted
Application number
EP20120003561
Other languages
German (de)
English (en)
Other versions
EP2525077B1 (fr
Inventor
Edgar Bignion
Waldemar Hampel
Walter Meindl
Werner Aichberger
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.)
Liebherr Machines Bulle SA
Original Assignee
Liebherr Machines Bulle 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 Liebherr Machines Bulle SA filed Critical Liebherr Machines Bulle SA
Publication of EP2525077A1 publication Critical patent/EP2525077A1/fr
Application granted granted Critical
Publication of EP2525077B1 publication Critical patent/EP2525077B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/16—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
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • 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
    • F02M61/184—Discharge orifices having non circular sections
    • 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
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/494—Fluidic or fluid actuated device making

Definitions

  • the present invention relates to a nozzle with a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or the seat hole.
  • the present invention relates to a Kraftstoffinjektordüse for injecting fuels in internal combustion engines.
  • nozzles with a dome-shaped elevation as a nozzle body are known from the prior art, in which the cylindrical or conical blind hole or seat hole is introduced at the back. From this then usually run a plurality of injection holes radially outward to the peripheral region of the survey.
  • the injection holes themselves are usually designed as a cylindrical bore.
  • the object of the present invention is to provide, starting from this prior art, a nozzle which has improved endurance, in particular in the area of the spray-hole inlets.
  • a nozzle according to the first aspect of the present invention has a nozzle body, in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or the seat hole. It is provided that the injection hole in the region of the injection hole inlet has a non-circular cross-section. The non-round cross section allows a targeted alignment of the forces acting on the spray hole and the nozzle body forces. In the injection hole entry is this the blind hole or the seat hole facing the end of the injection hole through which a fluid flowing through the nozzle from the blind hole or seat hole enters the injection hole.
  • the injection hole has a cross section with a longer and a shorter axis of symmetry in the region of the injection hole entry, e.g. an oval cross-section.
  • it is an elliptical cross section.
  • the injection hole in the region of the injection hole outlet on a circular cross-section is obtained.
  • the injection hole outlet is the end of the injection hole remote from the blind hole or seat hole, through which a fluid flowing through the nozzle exits from the injection hole.
  • the first aspect is used in the present invention in nozzles having a plurality of injection holes, which emanate from the blind hole or seat hole, wherein several or all of the injection holes in the region of the injection hole inlet have a non-circular cross-section.
  • the non-circular cross-sections of all blind holes have the same orientation with respect to the longitudinal axis of the blind hole or the seat hole or seat hole.
  • the short or long axes of symmetry of all injection holes with respect to the longitudinal axis of the blind hole or the seat hole or seat hole are all aligned in the same way.
  • the longer axis of the non-round cross-section in particular the longer axis of the ellipse, is aligned parallel or perpendicular to the longitudinal axis of the blind hole or the seat hole or seat hole.
  • the longer axis of the injection hole inlet can be aligned according to the acting stress in the nozzle body, wherein the cross section of the injection hole does not fall below the required minimum cross-section.
  • the nozzle according to a second aspect of the present invention comprises a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein from the blind hole or seat hole run out several injection holes.
  • the blind hole or seat hole has a groove from which the injection holes go out.
  • the arrangement of the spray hole inlets in the region of a groove on the inside of the blind hole or the seat hole can also be the notch stress, which arises in conventional Bohrungsverschneidung be reduced.
  • the groove is arranged rotationally symmetrical to the longitudinal axis of the blind hole or the seat hole.
  • the injection holes are arranged in relation to the blind hole axis at the same height.
  • the width of the groove in the direction of the longitudinal axis of the blind hole or the seat hole is wider than the diameter of the injection holes.
  • the injection holes are distributed uniformly on the circumference of the groove, d. H. that equal distances are provided between the individual spray holes.
  • a nozzle according to a third aspect of the present invention comprises a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or seat hole.
  • the injection hole is enlarged at the injection hole exit by a reduction. This makes it possible to increase the wall thickness along the injection hole axis, without increasing the spray hole length. This also leads to an increased fatigue strength, especially in the injection hole inlet.
  • the reduction is carried out rotationally symmetrical to the injection hole axis.
  • the countersinking is essentially U-shaped, so that it less influences the geometry of the jet cone leaving the injection hole.
  • the three aspects of the present invention taken alone, allow an increase in the fatigue strength of a nozzle, in particular a fuel injector nozzle.
  • the individual aspects can also be combined with each other.
  • first aspect of the present invention may be combined with the second and / or the third aspect.
  • second aspect can also be combined with the first or third aspect.
  • third aspect can be combined with the first and / or the second aspect.
  • the nozzle body is rotationally symmetrical.
  • the blind hole or seat hole can be performed rotationally symmetrical.
  • a plurality of injection holes are provided, which are arranged uniformly in the circumferential direction about the longitudinal axis of the nozzle body or the blind hole or the seat hole, d. H. with circumferentially equal distances.
  • the nozzle body may comprise a survey, in which the back of the blind hole or seat hole is introduced, wherein a plurality of injection holes leading from the blind hole or seat hole, starting radially outward to the peripheral region of the survey.
  • the survey can be dome-shaped.
  • the nozzle is in particular a fuel injector nozzle for injecting fuel in an internal combustion engine.
  • very high pressures are used in particular in direct injection engines, so that the increased fatigue strength of the nozzle by the present invention is of particular advantage.
  • the present invention further includes an internal combustion engine having such a nozzle for injecting fuel.
  • the nozzle can serve for the direct injection of fuel into the cylinder.
  • the present invention further includes a method of manufacturing a nozzle according to the first aspect of the present invention.
  • the non-round cross-section of the spray hole in the region of the spray hole entry is generated with an erosion wire which, during the production of the spray hole, leaves a path corresponding to the non-circular cross section of the spray hole in the space.
  • the web can be chosen not only in one plane, but also in depth.
  • the nozzle according to the invention advantageously consists of metal.
  • All embodiments of the present invention show a nozzle with a nozzle body 5, in which a blind hole or seat hole 1 is introduced at the back. From the blind hole or seat hole 1 while several spray holes 2 extend to the outside. The injection holes 2 are facing the blind hole or seat hole with their spray hole inlets 3, while the spray hole exits 4 point to the outside of the nozzle body 5.
  • the nozzle body 5 has in the region of the blind hole or the seat hole 1 on a survey, in which the blind hole or seat hole is introduced.
  • the elevation 5 has in the region of the blind hole or the seat hole 1 essentially a dome shape. Both the survey 5 and the blind hole or seat hole 1 are rotationally symmetrical in the embodiment.
  • the injection holes 2 extend from the side walls of the blind hole or the seat hole 1 radially outward to the peripheral region of the nozzle body 5.
  • the longitudinal axes of the injection holes 2 have in the height direction at an acute angle Longitudinal axis of the blind hole or the seat hole 1 and the nozzle body 5 on.
  • the injection holes 2 are arranged evenly around the blind hole or seat hole 1 in the circumferential direction.
  • the injection holes each have a non-circular injection hole entrance 3. Due to the non-circular design of the injection hole inlet 3 and the corresponding orientation of the injection hole inlets, the stresses acting in the region of the nozzle body 5 can be adjusted in a targeted manner.
  • all spray hole inlets have the same non-circular shape and the same orientation with respect to the longitudinal axis of the blind hole or the seat hole 1.
  • the spray hole outlets 4 of the spray holes continue to be circular in order to obtain a conventional fuel jet cone.
  • the spray hole entries are each formed elliptical.
  • the longer symmetry axis of the elliptical shape of the spray hole entry is aligned in accordance with the acting stresses (circumferential or axial stress), wherein the cross-sectional area of the ellipse does not fall below the required minimum cross-sectional area.
  • the ellipse is arranged horizontally at dominating hoop stress in the blind hole or seat hole.
  • the ellipse is arranged horizontally, when the longer axis of symmetry of the ellipse extends in a plane which is perpendicular to the longitudinal axis of the blind hole or the seat hole 1 and the nozzle body 5. This produces a lower notch effect in the direction of loading than when using a circular cross section.
  • the ellipse is arranged vertically at the dominant axial stress in the blind hole or seat hole.
  • the longer axis of symmetry of the ellipse is aligned in the direction of the longitudinal axis of the nozzle. This creates a lower notch effect in the direction of loading than in the circular cross section.
  • FIG. 3 an embodiment of the second aspect of the present invention is shown.
  • a rotationally symmetrical to the blind hole axis 7 groove 6 is provided in the region of the spray hole entries 3.
  • the groove 6 is provided in the side walls of the blind hole or the seat hole 1 and has in the height direction in approximately an extension, which corresponds to the injection holes 2.
  • the spray hole entries 3 are thus completely in the groove 6.
  • FIG. 4 an embodiment of the third aspect of the present invention is shown, according to which a drop 8 is provided at the injection hole outlet 4 respectively.
  • the counterbore 8 is designed rotationally symmetrical to the injection-hole axis 9.
  • the reduction has a U-shaped profile.
  • the present invention further includes a method of manufacturing a nozzle according to the first aspect of the present invention.
  • an erosion wire is used, which moves through a suitable control a defined path in space and thereby provides the non-circular cross section of the injection holes in the inlet region 3 and the round cross section in the exit region 4.
  • an EDM machine is used, in which the web can be chosen not only in one plane, but also in depth.
  • the present invention increases the reliability of the nozzles in the area of bore intersection of blind hole or seat hole to injection hole without having a significant influence on the geometry of the jet cone.
  • the nozzle is used as a fuel injection nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP12003561.3A 2011-05-16 2012-05-07 Buse Active EP2525077B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00824/11A CH704964A1 (de) 2011-05-16 2011-05-16 Düse.

Publications (2)

Publication Number Publication Date
EP2525077A1 true EP2525077A1 (fr) 2012-11-21
EP2525077B1 EP2525077B1 (fr) 2017-04-19

Family

ID=46146555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12003561.3A Active EP2525077B1 (fr) 2011-05-16 2012-05-07 Buse

Country Status (3)

Country Link
US (1) US20120292409A1 (fr)
EP (1) EP2525077B1 (fr)
CH (1) CH704964A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9695723B2 (en) * 2014-01-15 2017-07-04 General Electric Company Combustion system including a piston crown and fuel injector
DE102016215637A1 (de) * 2016-08-19 2018-02-22 Robert Bosch Gmbh Kraftstoffeinspritzdüse
US11098686B2 (en) * 2017-05-12 2021-08-24 Hitachi Automotive Systems, Ltd. Fuel injection valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809017A1 (fr) * 1996-05-22 1997-11-26 Steyr-Daimler-Puch Aktiengesellschaft Injecteur de carburant à deux étages pour moteurs à combustion interne
DE19843616A1 (de) * 1998-09-23 2000-03-30 Siemens Ag Kraftstoffeinspritzdüse
WO2003004867A1 (fr) * 2001-07-04 2003-01-16 Robert Bosch Gmbh Soupape d'injection de carburant pour moteur a combustion interne
EP1840368A2 (fr) * 2006-03-27 2007-10-03 Robert Bosch Gmbh Buse d'injection dotée de canaux d'injection et procédé d'introduction de canaux
EP2264307A1 (fr) * 2009-06-18 2010-12-22 Hitachi Automotive Systems, Ltd. Injecteur de carburant

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528915B1 (fr) * 1982-06-18 1986-04-18 Semt Injecteur de combustible et moteur a combustion interne equipe dudit injecteur
JPH11117833A (ja) * 1997-10-13 1999-04-27 Honda Motor Co Ltd 燃料噴射ノズル及びその製造方法
DE19931890A1 (de) * 1999-07-08 2001-01-18 Siemens Ag Düsenkörper für eine Kraftstoffeinspritzdüse mit optimierter Spritzlochkanalgeometrie
DE10026324A1 (de) * 2000-05-26 2001-11-29 Bosch Gmbh Robert Brennstoffeinspritzsystem
DE10032194A1 (de) * 2000-07-01 2002-01-10 Bosch Gmbh Robert Verfahren zum Herstellen von Bohrungen, insbesondere von Spritzlöchern in Einspritzdüsen, und Vorrichtung hierzu
DE10247958A1 (de) * 2002-10-15 2004-04-29 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
US20070200011A1 (en) * 2006-02-28 2007-08-30 Caterpillar Inc. Fuel injector having nozzle member with annular groove
GB0712403D0 (en) * 2007-06-26 2007-08-01 Delphi Tech Inc A Spray Hole Profile
US20110030635A1 (en) * 2009-08-04 2011-02-10 International Engine Intellectual Property Company, Llc Fuel injector nozzle for reduced coking

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809017A1 (fr) * 1996-05-22 1997-11-26 Steyr-Daimler-Puch Aktiengesellschaft Injecteur de carburant à deux étages pour moteurs à combustion interne
DE19843616A1 (de) * 1998-09-23 2000-03-30 Siemens Ag Kraftstoffeinspritzdüse
WO2003004867A1 (fr) * 2001-07-04 2003-01-16 Robert Bosch Gmbh Soupape d'injection de carburant pour moteur a combustion interne
EP1840368A2 (fr) * 2006-03-27 2007-10-03 Robert Bosch Gmbh Buse d'injection dotée de canaux d'injection et procédé d'introduction de canaux
EP2264307A1 (fr) * 2009-06-18 2010-12-22 Hitachi Automotive Systems, Ltd. Injecteur de carburant

Also Published As

Publication number Publication date
US20120292409A1 (en) 2012-11-22
EP2525077B1 (fr) 2017-04-19
CH704964A1 (de) 2012-11-30

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