EP2791495B1 - Soupape d'injection résistant à la cavitation - Google Patents

Soupape d'injection résistant à la cavitation Download PDF

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Publication number
EP2791495B1
EP2791495B1 EP12768793.7A EP12768793A EP2791495B1 EP 2791495 B1 EP2791495 B1 EP 2791495B1 EP 12768793 A EP12768793 A EP 12768793A EP 2791495 B1 EP2791495 B1 EP 2791495B1
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EP
European Patent Office
Prior art keywords
edge
region
valve
seating
armature
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.)
Active
Application number
EP12768793.7A
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German (de)
English (en)
Other versions
EP2791495A1 (fr
Inventor
Alper COMERT
Suat SACARCELIK
Rahman CAKIR
Ozan DINCEL
Ediz ILHAN
Veyzat GAZI
Serkan ELMALL
Erhan KAYAR
Barkin ARAK
Nese YENIGUN
Tuna AYDIN
Dogan Vardar
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2791495A1 publication Critical patent/EP2791495A1/fr
Application granted granted Critical
Publication of EP2791495B1 publication Critical patent/EP2791495B1/fr
Active 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0077—Valve seat details
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the present invention relates to an injection valve utilized for spraying fuel into the combustion chamber in internal combustion engines and comprising an armature and a valve piece provided at the continuation of said armature.
  • Injection valves are used for spraying fuel into the combustion chamber in internal combustion engines. Injection valves are obtained by bringing pluralities of pieces together and the pieces are directly or indirectly in connection with each other.
  • the injection valves comprise different members according to the operation principles thereof, and the injection valves comprising a valve piece is one of these injection valves.
  • Said injection valves comprise a valve piece, and armature and valve ball provided on the valve piece.
  • Such injection valves are essentially disclosed in the patent WO 2011 051060 (A1 ).
  • the improvements related to the valve piece and to the valve bearing thereon are disclosed.
  • the high pressured fuel existing inside the valve piece, passes to the armature region through the hole.
  • valve ball keeps the hole open permanently and fuel transfer is provided through the hole towards the armature.
  • cavitation bubbles are formed in the fuel, which is under the affect of high pressure, and particularly in overload conditions. These bubbles blow out on the valve bearing on the valve piece or during the passage from the valve piece to the armature and thereby said bubbles lead to cavitation and abrasions. This affects the usage lifetime of the valve piece and of the armature. Moreover, the abrasions and cavitation, which occur in the seating part, prevent sealing in required cases.
  • patent application DE 10 2006 000 256 A1 discloses an injection valve with a control valve, whereby the valve seating is surrounded by a ring shaped notch.
  • the present invention relates to an injection valve where sealing in the seating part existing between the valve piece and the armature is provided in a figurative manner and where cavitation is prevented, in order to eliminate the abovementioned problems and to bring new advantages to the related technical field.
  • the main object of the present invention is to provide an injection valve where the cavitation, formed between the valve piece and the armature, is prevented by means of formal precautions.
  • Another object of the present invention is to provide an injection valve where the sealing between the valve piece and the armature is provided by means of figurative precautions.
  • the present invention relates to an injection valve comprising an input region through which the fuel enters; an armature having a wide region which is provided at the continuation of said input region and having a narrow region with a seating surface at the continuation thereof; a valve piece which has a seating part and which is provided at the continuation of said armature and which is positioned so as to define a valve bearing in between; a control volume provided inside said valve piece; and a hole which is provided at said valve piece between said valve bearing and said control volume.
  • Said injection valve comprises at least one seating region where the fuel, exiting from said hole towards the valve bearing, is sealed; a sealing surface, which has a linear cross section, of the part which at least covers the hole between the armature and the valve piece in said seating region; and cut-outs on the valve piece and on the armature so that the fuel, comprising cavitation bubbles exiting the hole, is able to flow substantially far away from the edges of the armature and of the valve piece inside the valve bearing.
  • the passage from said wide region, provided at the armature, to said narrow region comprises at least one inclined edge;
  • the valve piece comprises angled edges with respect to each other in order to provide the free spreading of the fuel, exiting the hole of the seating region, in the valve bearing; and there is at least one passage edge which is embodied at the lower elevation at a certain distance in X direction from the point where the hole is opened into the valve bearing.
  • said seating edge is curved.
  • the passage from said wide region, provided at the armature, to said narrow region comprises at least one inclined edge which is positioned in X direction and at a certain angle to said flat edge; at least one seating surface which is provided at the continuation of said inclined edge and which is positioned substantially parallel to the flat edge; at least one passage edge which is positioned substantially parallel to the flat edge and which is provided at the continuation of said second angled edge of said seating part which is provided at the valve piece; at least one third angled edge which is provided at the continuation of said passage edge and which is positioned in opposite direction to the X direction and so as to make a certain angle with the passage edge; at least one fourth angled edge which is provided at the continuation of said third angled edge and which is positioned so as to make a certain angle with the third angled edge; and at least one seating edge which is provided between said fourth angled edge and said hole and where the valve piece is in linear contact with the armature.
  • an injection valve (10) is disclosed which is used for spraying fuel into the combustion chamber (not illustrated in the figure) in internal combustion engines (not illustrated in the figure) and where the sealing between the armature (40) and the valve piece (30) is provided by means of figurative precautions and where the cavitation formation in the valve bearing (14) part of the valve piece (30) is prevented.
  • an injection valve (10) is illustrated.
  • Said injection valve (10) comprises an input region (11) through which the fuel enters, and a needle region (12) through which the fuel is sprayed to the combustion chamber.
  • Said input region (11) and said needle region (12) are generally provided on a body (13) which has a circular cross section.
  • an armature (40) in X direction is in connected form.
  • Said armature (40) generally has a circular cross section and it is positioned so as to be coaxial with the injection valve (10).
  • the armature (40) comprises two parts. These parts are the wide region (41) and the narrow region (42).
  • Said wide region (41) is positioned so as to correspond to the vicinity of the input region (11) of the injection valve (10). There is said narrow region (42) at the continuation of the wide region (41). The narrow region (42) is positioned so as to be coaxial with the wide region (41). The diameter of the narrow region (42) is smaller than the diameter of the wide region (41).
  • the inclined edge (421) is in connection to the flat edge (411), which is defined on the wide region (41), at a certain angle. Said inclined edge (421) is embodied so as to have a certain length.
  • a seating surface (422) is defined at the continuation of the inclined edge (421). Said seating surface (422) is positioned so as to make a certain angle with the inclined edge (421) and so as to be parallel to said flat edge (411). The inclined edge (421) and the seating surface (422) are provided on the narrow region (42).
  • a valve piece (30) is in connection to the injection valve (10) at the continuation of the armature (40) in the X direction and between the input region (11) and the needle region (12). Said valve piece (30) is coaxial with the injection valve (10) and with the armature (40). The valve piece (30) is positioned so as to separate the high pressure region (not illustrated in the figure) inside the injection valve (10) from the low pressure regions (not illustrated in the figure) and the valve piece (30) provides the sealing between said high pressure and low pressure regions.
  • the part of the valve piece (30) which is at a vicinity of the high pressure region is defined as the high pressure part (31).
  • Said control volume (32) is in the region where the high pressured fuel exists in the valve piece (30) and which is adjacent to the valve piston (not illustrated in the figure).
  • the control volume (32) has a circular cross section and it is positioned inside the valve piece (30) so as to be smaller than the diameter of the high pressure part (31) and so as to be coaxial with the valve piece (30).
  • a seating part (34) is provided at the continuation of the high pressure part (31).
  • Said seating part (34) is positioned so as to be adjacent to the armature (40) and to the low pressure region and so as to be in the opposite direction to direction X.
  • the diameter of the seating part (34) is embodied so as to be greater than the diameter of the high pressure part (31).
  • the seating part (34) has a W-like view when viewed from the cross section.
  • the top edge of the seating part (34) at a vicinity of the input region (11) in opposite direction to direction X is defined as the upper edge (346).
  • Said upper edge (346) exists in the same horizontal level with the flat edge (411) of the armature (40).
  • the valve piece (30) rests onto the other members of the injection valve (10) by means of the upper edge (346).
  • There is a first angled edge (341) which is in connection with the upper edge (346).
  • Said first angled edge (341) is positioned at a vicinity of the armature (40) and in X direction and so as to make a certain angle with the upper edge (346).
  • the angle between the first angled edge (341) and the upper edge (346) is defined as the ⁇ angle.
  • the second angled edge (342) is in connection.
  • the angle between the second angled edge (342) and the first angled edge (341) is defined as the ⁇ angle.
  • the ⁇ angle is greater than the ⁇ angle.
  • Said third angled edge (343) is positioned so as to make a certain angle with the passage edge (347) and at an opposite direction to the X direction.
  • the angle between the passage edge (347) and the third angled edge (343) is defined as the ⁇ angle.
  • Said fourth angled edge (344) makes a certain angle with the third angled edge (343) and this angle is called the ⁇ angle.
  • the third angled edge (343) ends so as to be adjacent to the seating surface (422) of the armature (40).
  • the third angled edge (343) and the fourth angled edge (344) extends towards the axis of the injection valve (10) from the passage edge (347).
  • a hole (33) is embodied to the valve piece (30). Said hole (33) is positioned so as to begin in an adjacent manner to the armature (40) on the valve piece (30) and so as to end in the control volume (32).
  • the hole (33) is coaxial with the valve piece (30).
  • the hole (33) essentially comprises three parts. These parts are the first region (331); the intermediate region (332) and the second region (333). The part of the hole (33) which is adjacent to the control volume (32) is defined as said first region (331).
  • the hole (33) has a circular cross section in this region. There is said intermediate region (332) at the continuation of the first region (331).
  • the intermediate region (332) exists in the opposite direction of the first region (331) in X direction.
  • the diameter of the intermediate region (332) is embodied to be smaller than the diameter of the first region (331).
  • the diameter of the second region (333) is embodied to be greater than the diameter of the intermediate region (332) and embodied to be smaller than the diameter of the first region (331).
  • the second region (333) ends so as to be adjacent to the fourth angled edge (344) and to the armature (40).
  • Said seating edge (345) is embodied in a convex manner so as to have a certain diameter.
  • the valve piece (30) seats onto the seating surface (422) of the armature (40) by means of the seating edge (345).
  • the region, which is provided by means of the seating edge (345) and which remains between the armature (40) and the second region (333) is defined as the space (21).
  • the region, which is provided by means of the angled edges (341, 342, 343, 344) existing on the valve piece (30) and which is provided between the valve piece (30) and the armature (40), is defined as the valve bearing (14).
  • the region, where the seating edge (345) of the valve piece (30) and the seating surface (422) of the armature (40) contact with each other is defined as the seating region (20). In said seating region (20), the sealing and tightness between the armature (40) and the valve piece (30) is provided by linear contact.
  • Injection valves (10) are essentially used for spraying fuel to the combustion chamber in internal combustion engines.
  • the fuel enters into the injection valves (10) through the input region (11) and the fuel is transferred to the needle region (12) by means of the different members (not illustrated in the figure) and the spraying process is realized by the members (not illustrated in the figure) in the needle region (12).
  • the valve piece (30) separates the high and low pressure regions inside the injection valve (10) from each other and it provides the sealing between these regions.
  • the control volume (32) facilitates the transfer of the fuel to the needle region (12) in a controlled manner.
  • the armature (40) covers the hole (33) of the valve piece (30) with the help of electrical systems (not illustrated in the figure) and prevents fuel discharge up to a certain pressure through the valve piece (30).
  • cavitation bubbles are formed in the high pressured fuel particularly in cases of overloads to the engine.
  • the cavitation bubbles existing inside the fuel which passes from the control volume (32) to the valve bearing (30) by means of the hole (33), blow out inside the hole (33), and in the passages of said bubbles to the region where the valve bearing (14) exists, they do not lead to any abrasion or cavitation on the outer face of the valve piece (14).
  • the hole (33), which is embodied so as to be longer when compared with the prior art, and particularly the second region (333) helps the cavitation bubbles to blow out inside the hole (33). Thanks to this, the valve bearing (14) is protected from cavitation during high engine loadings. Moreover, thanks to the angled edges (341, 342, 343, 344) corresponding to the valve bearing (14) part on the valve piece (30) and thanks to the convex surfaces, the cavitation bubbles reaching the valve bearing (14) part blow out before approaching the valve piece (30) and the cavitation problem is prevented. Problems may occur since the tightness, existing in the seating region (20) wherein seating is realized between the valve piece (30) and the armature (40), is provided by linear contact.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (4)

  1. Soupape d'injection (10) comprenant une région d'entrée (11) à travers laquelle pénètre du carburant ; une armature (40) comportant une région large (41) qui est placée dans le prolongement de ladite région d'entrée (11) et comportant une région étroite (42) avec une surface d'appui (422) dans son prolongement ; une pièce de soupape (30) qui comporte une partie d'appui (34) et qui est placée dans le prolongement de ladite armature (40) et qui est positionnée de façon à définir un palier de soupape (14) entre celles-ci ; un volume de commande (32) placé à l'intérieur de ladite pièce de soupape (30) ; et un orifice (33) qui est placé au niveau de ladite pièce de soupape (30) entre ledit palier de soupape (14) et ledit volume de commande (32), comprenant au moins une région d'appui (20) dans laquelle le carburant, sortant par ledit orifice (33) en direction du palier de soupape (14), est enfermé hermétiquement ; une surface d'étanchéité (345, 422), qui présente une section transversale linéaire, dont une partie recouvre au moins l'orifice (33) entre l'armature (40) et la pièce de soupape (30) dans ladite région d'appui (20) ; et des évidements sur la pièce de soupape (30) et sur l'armature (40) de telle sorte que le carburant, comprenant des bulles de cavitation et sortant par l'orifice (33), puisse s'écouler de manière à s'éloigner considérablement des bords de l'armature (40) et de la pièce de soupape (30) à l'intérieur du palier de soupape (14), et au moins un bord d'appui (345) existe entre la région d'appui (20) et l'extrémité de l'orifice (33) à proximité de la région d'appui (20).
  2. Soupape d'injection (10) selon la revendication 1, caractérisée en ce que le passage de ladite région large (41), placée au niveau de l'armature (40), à ladite région étroite (42) comprend au moins un bord incliné (421) ; la pièce de soupape (30) comprend des bords obliques (341, 342, 343, 344) les uns vis-à-vis des autres afin d'assurer une propagation libre du carburant, sortant par l'orifice (33) de la région d'appui (20), dans le palier de soupape (14) ; et au moins un bord de passage (347) existe, celui-ci étant réalisé au niveau inférieur à une certaine distance dans une direction X à partir du point où l'orifice (33) débouche dans le palier de soupape (14).
  3. Soupape d'injection (10) selon la revendication 1, caractérisée en ce que ledit bord d'appui (345) est incurvé.
  4. Soupape d'injection (10) selon la revendication 2, caractérisée en ce que le passage de ladite région large (41), placée au niveau de l'armature (40), à ladite région étroite (42) comprend au moins un bord incliné (421) qui est positionné dans la direction X et à un certain angle par rapport audit bord plat (411) ; au moins une surface d'appui (422) qui est placée dans le prolongement dudit bord incliné (421) et qui est positionnée essentiellement parallèlement au bord plat (411) ; au moins un bord de passage (347) qui est positionné essentiellement parallèlement au bord plat (411) et qui est placé dans le prolongement dudit deuxième bord oblique (342) de ladite partie d'appui (34) qui est placée au niveau de la pièce de soupape (30) ; au moins 5 un troisième bord oblique (343) qui est placé dans le prolongement dudit bord de passage (347) et qui est positionné dans la direction opposée à la direction X et de façon à former un certain angle avec le bord de passage (347) ; au moins un quatrième bord oblique (344) qui est formé dans le prolongement dudit troisième bord oblique (343) et qui est positionné de manière à former un certain angle avec le troisième bord oblique (343) ; et au moins un bord d'appui (345) qui est placé entre ledit quatrième bord oblique (344) et ledit orifice (33) et au niveau duquel la pièce de soupape (30) est en contact linéaire avec l'armature (40).
EP12768793.7A 2011-10-01 2012-10-01 Soupape d'injection résistant à la cavitation Active EP2791495B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201109728 2011-10-01
PCT/EP2012/069322 WO2013045690A1 (fr) 2011-10-01 2012-10-01 Soupape d'injection résistant à la cavitation

Publications (2)

Publication Number Publication Date
EP2791495A1 EP2791495A1 (fr) 2014-10-22
EP2791495B1 true EP2791495B1 (fr) 2016-08-24

Family

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Application Number Title Priority Date Filing Date
EP12768793.7A Active EP2791495B1 (fr) 2011-10-01 2012-10-01 Soupape d'injection résistant à la cavitation

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EP (1) EP2791495B1 (fr)
WO (1) WO2013045690A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6507890B2 (ja) * 2015-07-02 2019-05-08 株式会社デンソー 燃料噴射弁
TR201820749A2 (tr) * 2018-12-27 2020-07-21 Bosch Sanayi Ve Tic A S Bi̇r yakit enjektörünün valf grubu i̇çi̇n bi̇r yakit akiş yolu

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3584554B2 (ja) * 1995-07-26 2004-11-04 株式会社デンソー 蓄圧式燃料噴射装置
ITTO20010970A1 (it) * 2001-10-12 2003-04-12 Fiat Ricerche Inettore di combustibile per un motore a combustione interna.
JP2007009899A (ja) * 2005-05-31 2007-01-18 Denso Corp 燃料噴射弁
DE102006021741A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102009045995A1 (de) 2009-10-26 2011-06-09 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102010028844A1 (de) * 2010-05-11 2011-11-17 Robert Bosch Gmbh Schaltventil
US20120103308A1 (en) * 2010-10-28 2012-05-03 Caterpillar, Inc. Two-Way Valve Orifice Plate for a Fuel Injector

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Publication number Publication date
WO2013045690A1 (fr) 2013-04-04
EP2791495A1 (fr) 2014-10-22

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