EP2287460B1 - Injecteur de carburant pour un moteur à combustion interne - Google Patents

Injecteur de carburant pour un moteur à combustion interne Download PDF

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Publication number
EP2287460B1
EP2287460B1 EP10162231A EP10162231A EP2287460B1 EP 2287460 B1 EP2287460 B1 EP 2287460B1 EP 10162231 A EP10162231 A EP 10162231A EP 10162231 A EP10162231 A EP 10162231A EP 2287460 B1 EP2287460 B1 EP 2287460B1
Authority
EP
European Patent Office
Prior art keywords
valve
plate
fuel injector
space
injector according
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.)
Not-in-force
Application number
EP10162231A
Other languages
German (de)
English (en)
Other versions
EP2287460A1 (fr
Inventor
Dieter Junger
Udo Schaich
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
Original Assignee
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 EP2287460A1 publication Critical patent/EP2287460A1/fr
Application granted granted Critical
Publication of EP2287460B1 publication Critical patent/EP2287460B1/fr
Not-in-force 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves

Definitions

  • the invention relates to a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, comprising a valve plate which forms a valve seat for a valve pin, which is displaceably guided in a sealing sleeve and separates a return space from a valve space when in contact with the valve seat via a bolt head.
  • the valve space communicates with a control space of a nozzle needle via a flow restrictor passing through a throttle plate and is connectable to a high pressure inlet via a bypass
  • the valve pin is movable from the valve seat to an open position upon actuation of an actuator unit to flow Allow fuel from the valve chamber in the return chamber and initiate this by a pressure drop in the control chamber, an opening movement of the nozzle needle.
  • FIG. 1 is a fuel injector of the prior art in the area of a valve plate 1 'to see.
  • This valve plate 1 is arranged together with a throttle plate 2 'within a housing 3', wherein the valve plate 1 and the throttle plate 2 'between them define a valve space 4'.
  • a valve pin 5' is arranged, which via a bolt head 6 'with a, on the valve plate 1' formed valve seat 7 'is brought into contact and also in a sealing sleeve 8' slidably guided.
  • valve space 5 ' is replaced by a valve chamber 5' by a return space 10 '. separated, which is in communication with a low pressure region of the fuel injector.
  • valve chamber 4 ' is connected via a flow restrictor 11' extending through the throttle plate 2 'to a control chamber 12' of a nozzle needle 13 'which is connected to the inlet throttle 14' with a high-pressure inlet 15 'by means of an inlet throttle 14' also passing through the throttle plate 2 '.
  • the fuel injector is in communication.
  • a relief hole 16' is provided which connects a, between the valve pin 5 ', sealing sleeve 8' and throttle plate 2 'defined space with the low pressure region of the fuel injector.
  • valve pin 5 ' is now displaced axially by the action of a coupler module 17' - not shown here - actuator, so filled with high pressure fuel valve space 4 'with the low pressure return chamber 10' by lifting the bolt head 6 ' from the valve seat 7 'connected.
  • This causes a pressure drop in the valve chamber 4 'and on the outlet throttle 11' and in the control chamber 12 ', which in known manner causes an opening movement of the nozzle needle 13' and initiates an injection process.
  • the valve pin 5 ' remains in the open position, so that under high pressure fuel escapes steadily from the valve chamber 4' in the return chamber 10 '.
  • valve chamber 4 'of such a fuel injector via a bypass also with the high-pressure inlet 15' is directly in communication to the end of the injection process and from a Contact the bolt head 6 'with the valve seat 7' to fill the valve chamber 4 'and via the outlet throttle 11' and the control chamber 12 'with fuel under high pressure.
  • the bypass also runs in the throttle plate 2 'and flows between the sealing sleeve 8' and the walls of the valve chamber 4 'in this one.
  • a fuel injector of the prior art has the considerable disadvantage that in the opening position of the valve pin constantly fuel flows from the bypass into the return space. As a result, the return amount of the fuel injector increases significantly, resulting in an increase in the operating temperature of the fuel injector and a reduction in the injection pressure. In addition, the time interval between the movement of the valve pin in the open position and the opening movement of the nozzle needle is increased, since the reduction of the pressure in the control chamber is slower due to the fuel flowing continuously into the valve chamber.
  • the invention comprises the technical teaching that a receiving plate is provided between the valve plate and the throttle plate, which defines the valve space together with the valve plate and has a bore.
  • the valve pin runs in this bore and is in the open position via a, the valve seat facing away sealing surface of the bolt head with the receiving plate in contact, whereby the bypass is separated from the valve chamber.
  • the sealing surface of the bolt head with a peripheral sealing edge on the receiving plate in contact, wherein the sealing surface and the receiving plate form an angle.
  • the sealing edge is formed at the transition of the bore in the, the valve chamber facing side of the receiving plate.
  • the sealing edge is thereby placed concentrically and with a small difference in diameter for guiding the valve pin, which reduces the holding force necessary for the bypass shutdown.
  • the sealing sleeve is placed in a radial expansion of the bore and biased by a, between the receiving plate and sealing sleeve arranged spring element against the throttle plate.
  • the spring element is advantageously designed as a plate spring.
  • the sealing sleeve is in communication with the throttle plate via a circumferential biting edge.
  • the bypass opens into the bore of the receiving plate.
  • the bypass is formed by a, in the receiving plate in the radial direction extending groove.
  • valve pin is movable against a return spring in the open position, which is placed in a, formed between the sealing sleeve and throttle plate space and communicates via a disc with a shaft of the valve pin.
  • FIG. 2 is a sectional view of the fuel injector according to the invention according to a first embodiment in the region of a valve pin 5 can be seen.
  • a receiving plate 18 is placed between a valve plate 1, which forms a valve seat 7 for a bolt head 6 of the valve pin 5, and a throttle plate 2.
  • This receiving plate 18 defines together with the valve plate 1 a valve chamber 4 and has a bore 19 through which a shaft 20 of the valve pin 5 is passed.
  • a sealing sleeve 8 is furthermore placed, in which the valve pin 5 is guided displaceably via its shaft 20 and which is biased against the throttle plate 2 via a disc spring 21 placed between itself and the receiving plate 18.
  • the bolt head 6 facing away from the valve pin 5 is provided on its shaft 20 with a disc 22, via which it is in contact with a return spring 23.
  • This return spring 23 is in a, between Throttle plate 2 and sealing sleeve 8 defined space placed and pushes the valve pin 5 with the bolt head 6 in the valve seat 7.
  • the valve chamber 4 is separated by a lying above the valve pin 5 return chamber 10.
  • the valve pin 5 is at the front end of the bolt head 6 with a - not shown here - Actuator in operative connection, in the actuation of the valve pin 5 is moved in the direction throttle plate 2.
  • valve chamber 4 via a bypass 24 with high-pressure fuel can be supplied.
  • This bypass 24 communicates with a - not visible in this view - high-pressure inlet and opens radially into the bore 19 of the receiving plate 18 in the region of the sealing sleeve 8 a.
  • the fuel can reach the valve chamber 4 in the further course via the gap formed between the receiving plate 18 and the sealing sleeve 8 and between the receiving plate 18 and the shaft 20 of the valve pin 5.
  • the valve chamber 4 is connected via an outlet throttle 11 with a control chamber 12 of a nozzle needle 13 in connection, which passes through the throttle plate 2 and the receiving plate 18 and opens in the outer radial region of the valve chamber 4 in this.
  • the receiving plate 18 has at the transition of the bore 19 in the, the valve chamber 4 facing side of the receiving plate 18 via a sealing edge 25 which occurs in a displacement of the valve pin 5 in the direction of the receiving plate 18 with a sealing surface 26 on the bolt head 6 in contact and thus preventing the flow of fuel from the gap between bore 19 and valve pin 5 in the valve chamber 4.
  • the sealing surface 26 extends at the bolt head 6 with respect to its side facing the receiving plate 18 beveled so that both components enclose an angle ⁇ .
  • valve pin 5 If current is applied to the actuator unit of the fuel injector, then the valve pin 5 is displaced counter to the return spring 23, overcoming a certain force limit in the direction of the receiving plate 18 and thus the bolt head 6 is moved out of the valve seat 7. Due to the differential pressure between the valve chamber 4 and the return chamber 10 then fuel flows from the valve chamber 4 in the return chamber 10 and causes a pressure drop In this case, fuel flows via the outlet throttle 11 and initially also via the bypass 24 and the gaps between the receiving plate 18 and the sealing sleeve 8 or the shaft 20 of the valve pin 5 in the valve chamber 4. However, as soon as the valve pin 5 has arrived in its open position and while the sealing surface 26 of the bolt head 6 has come into contact with the sealing edge 25, the subsequent flow through the bypass 24 is suppressed.
  • the total feed rate decreases because the volume flow of fuel flowing through the outlet throttle 11 remains constant due to the cavitating design of the outlet throttle 11, which leads to a faster decrease of the pressure in the control chamber 12. From a certain pressure level in the control chamber 12, this causes the manner known in the art to initiate an opening movement of the nozzle needle 13 and the start of an injection process.
  • valve pin 5 is pushed back again in the direction of the valve plate 1 via the return spring 23.
  • This closing movement is supported by the high pressure between the sealing edge 25 and the sealing surface 26 flowing fuel.
  • the control chamber 12 also being filled via the outlet throttle 11.
  • inlet channel of the control chamber 12 is thereby causes a rapid increase in pressure in the control chamber 12, thus achieving the initiation of a rapid closing movement of the nozzle needle 13.
  • FIG. 4 is a sectional view of the fuel injector according to the invention according to a second embodiment in the region of the valve pin 5 can be seen.
  • a fuel supply of the valve chamber 4 is accomplished in this case via a bypass 24 in the form of a groove on the receiving plate 18.
  • the bypass 24 is a very short connecting line between a high pressure inlet 15 and the gaps between the receiving plate 18 and the sealing sleeve 8 and the shaft 20 of the valve pin 5.

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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)
  • Fuel-Injection Apparatus (AREA)

Claims (10)

  1. Injecteur de carburant pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant une plaque de soupape (1), qui constitue un siège de soupape (7) pour une goupille de soupape (5), qui est guidée de manière déplaçable dans une douille d'étanchéité (8), et qui sépare par le biais d'une tête de goupille (6), un espace de reflux (10) d'un espace de soupape (4) en cas de contact avec le siège de soupape (7), l'espace de soupape (4) étant en liaison par le biais d'un étranglement de sortie (11) s'étendant à travers une plaque d'étranglement (2), avec un espace de commande (12) d'une aiguille de buse (13) et pouvant être connecté par le biais d'une dérivation (24) à une alimentation haute pression (15), la goupille de soupape (5) pouvant être déplacée dans une position d'ouverture lors de l'actionnement d'une unité d'actionneur à partir du siège de soupape (7) afin de permettre un écoulement de carburant hors de l'espace de soupape (4) dans l'espace de reflux (10) et d'amorcer de ce fait par une chute de pression dans l'espace de commande (12) un mouvement d'ouverture de l'aiguille de buse (13), caractérisé en ce qu'entre la plaque de soupape (1) et la plaque d'étranglement (2) est prévue une plaque de réception (18) qui définit, conjointement avec la plaque de soupape (1), l'espace de soupape (4) et qui présente un alésage (19) dans lequel glisse la goupille de soupape (5), la goupille de soupape (5), dans la position d'ouverture, étant en contact par le biais d'une surface d'étanchéité (26) de la tête de goupille (6) opposée au siège de soupape (7), avec la plaque de réception (18) et séparant ainsi la dérivation (24) de l'espace de soupape (4).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que dans la position d'ouverture de la goupille de soupape (5), la surface d'étanchéité (26) de la tête de goupille (6) est en contact avec une arête d'étanchéité périphérique (25) sur la plaque de réception (18), la surface d'étanchéité (26) et la plaque de réception (18) formant un angle (α).
  3. Injecteur de carburant selon la revendication 2, caractérisé en ce que l'arête d'étranglement (25) est réalisée à la transition de l'alésage (19) dans le côté de la plaque de réception (18) tourné vers l'espace de soupape (4).
  4. Injecteur de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que la douille d'étanchéité (8) est placée dans un élargissement radial de l'alésage (19) et est précontrainte par le biais d'un élément de ressort disposé entre la plaque de réception (18) et la douille d'étanchéité (8) contre la plaque d'étranglement (2).
  5. Injecteur de carburant selon la revendication 4, caractérisé en ce que l'élément de ressort est réalisé sous forme de ressort Belleville (21).
  6. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la douille d'étanchéité (8) est en liaison avec la plaque d'étranglement (2) par le biais d'une arête d'attaque périphérique.
  7. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la dérivation (24) débouche dans l'alésage (19) de la plaque de réception (18).
  8. Injecteur de carburant selon la revendication 7, caractérisé en ce que
    la dérivation (24) est formée par une rainure s'étendant dans la plaque de réception (18) dans la direction radiale.
  9. Injecteur de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la goupille de soupape (5) peut être déplacée dans la position d'ouverture à l'encontre d'un ressort de rappel (23) qui est placé dans un espace réalisé entre la douille d'étanchéité (8) et la plaque d'étranglement (2) et qui est en liaison par le biais d'une rondelle (22) avec une tige (20) de la goupille de soupape (5).
  10. Système d'injection de carburant d'un moteur à combustion interne à auto-allumage, comprenant au moins un injecteur de carburant selon l'une quelconque des revendications 1 à 9.
EP10162231A 2009-07-07 2010-05-07 Injecteur de carburant pour un moteur à combustion interne Not-in-force EP2287460B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009027504A DE102009027504A1 (de) 2009-07-07 2009-07-07 Kraftstoffinjektor für eine Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP2287460A1 EP2287460A1 (fr) 2011-02-23
EP2287460B1 true EP2287460B1 (fr) 2012-02-29

Family

ID=42779966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10162231A Not-in-force EP2287460B1 (fr) 2009-07-07 2010-05-07 Injecteur de carburant pour un moteur à combustion interne

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EP (1) EP2287460B1 (fr)
AT (1) ATE547617T1 (fr)
DE (1) DE102009027504A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010040874A1 (de) * 2010-09-16 2012-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102011002955A1 (de) * 2011-01-21 2012-07-26 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102012212264B4 (de) 2012-07-13 2014-02-13 Continental Automotive Gmbh Verfahren zum Herstellen eines Festkörperaktuators
DE102012212266B4 (de) * 2012-07-13 2015-01-22 Continental Automotive Gmbh Fluidinjektor
CN106762282A (zh) * 2017-01-18 2017-05-31 哈尔滨工程大学 旁通式电控喷油器
CN106762286B (zh) * 2017-01-18 2023-03-21 哈尔滨工程大学 一种带液力反馈的微动态回油旁通式电控喷油器
CN106762287B (zh) * 2017-01-18 2023-03-21 哈尔滨工程大学 一种带液力反馈的谐振孔板式电控喷油器
DE102019220172A1 (de) * 2019-12-19 2021-06-24 Vitesco Technologies GmbH Kraftstoffinjektor für eine Brennkraftmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004046191B3 (de) * 2004-09-23 2006-04-13 Siemens Ag Servoventil und Einspritzventil
DE102004049702B3 (de) * 2004-10-12 2006-03-09 Siemens Ag Servoventil und Einspritzventil
DE102006009070A1 (de) * 2006-02-28 2007-08-30 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102006019736A1 (de) * 2006-04-28 2007-10-31 Robert Bosch Gmbh Kraftstoffinjektor
US20090165749A1 (en) * 2007-12-27 2009-07-02 Caterpillar Inc. Engine and control valve assembly having reduced variability in operation over time

Also Published As

Publication number Publication date
ATE547617T1 (de) 2012-03-15
EP2287460A1 (fr) 2011-02-23
DE102009027504A1 (de) 2011-01-20

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