WO2013000635A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
WO2013000635A1
WO2013000635A1 PCT/EP2012/059532 EP2012059532W WO2013000635A1 WO 2013000635 A1 WO2013000635 A1 WO 2013000635A1 EP 2012059532 W EP2012059532 W EP 2012059532W WO 2013000635 A1 WO2013000635 A1 WO 2013000635A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve pin
fuel injector
chamber
sealing sleeve
Prior art date
Application number
PCT/EP2012/059532
Other languages
German (de)
English (en)
Inventor
Holger Rapp
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
Priority to EP12723454.0A priority Critical patent/EP2726731B1/fr
Priority to CN201280032552.XA priority patent/CN103635686B/zh
Publication of WO2013000635A1 publication Critical patent/WO2013000635A1/fr

Links

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
    • 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
    • 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
    • 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
    • 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
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • Such a fuel injector is known from DE 10 2010 063 540 A1 of the applicant.
  • it is provided to reduce the fuel volume in the valve chamber, that a valve spring is acted upon in its closed position by spring pressure in a pressure spring separated from the valve chamber low pressure region, the low pressure region is hydraulically separated from the valve chamber via a biting edge of a sealing sleeve.
  • the sealing sleeve in turn serves to guide the valve pin axially displaceably arranged valve pin and the hydraulic separation of the lower end face of the valve chamber.
  • a shim is arranged, against which at the same time an end face of the compression spring is supported, wherein the shim limiting the maximum opening stroke of the valve pin is used when it rests with its lower end face on the shim.
  • the compression spring is arranged within the region of a low-pressure region in the region of a guide body whose spherically formed bottom bears against the bottom of the low-pressure region in order to be able to compensate for tilting movements or plane errors of the bottom of the low-pressure region.
  • the disadvantage here is that the setting of the maximum opening stroke of the valve pin is relatively complicated insofar as that the dial used depends on the accuracy of the formation of the low pressure region, in particular its depth, as well as the accuracy of the production of the guide body. you Although now could try to allow by a plane or flat surface at the bottom of the low pressure area easier production of the guide body, however, such a flat surface at the bottom of the low pressure area is not finished by means of drilling or turning, but the surface should plan sanded, but this eliminates cost reasons.
  • the invention has the object, a fuel injector according to the preamble of claim 1 such that a particularly simple or inexpensive adjustment of the opening stroke of the valve pin is achieved.
  • This object is achieved with a fuel! Njektor solved with the features of claim 1, characterized in that the opening stroke is effected by an at least indirect concern of the valve pin on the sealing sleeve.
  • the sealing sleeve and the adjusting disk are formed of different material, wherein the adjusting disk is designed, for example, with a particularly wear-resistant or hard surface is to avoid wear on the impact of the valve pin on the shim or minimize.
  • the sealing sleeve may consist, for example, of a material softer or different from the adjusting disk.
  • the shim is arranged on the valve seat surface side facing the sealing sleeve and cooperating to form the stroke stop with an enlarged diameter portion of the valve pin.
  • the compression spring in the low-pressure region usually has a diameter, which is greater than the diameter of the valve pin, relative to the valve pin in the valve chamber.
  • a preferably disc-shaped transmission body is arranged in the low pressure region, which is loaded by the spring force of the compression spring on the end facing away from the valve face Valve pin rests.
  • the reaction rate of the actuated by the control valve, downstream high-pressure hydraulics on the valve pin movement depends in particular on the fuel volume in the valve chamber.
  • the sealing sleeve on the side facing the compression spring has a biting edge which rests sealingly on an end face of the valve chamber.
  • the compression spring rests on the side facing away from the valve pin on a spring support element.
  • This spring support element in particular forms a plane or even support for the compression spring.
  • a further improvement of the guidance of the compression spring is achieved if the spring support element is part of a guide element which has a preferably zapfenförmi- gene guide portion which is radially surrounded by the compression spring.
  • a further improvement of the leadership of the compression spring by the spring support member is achieved when the spring support member on the side facing away from the compression spring has a radially circumferential chamfer.
  • a diameter of the sealing seat between the valve pin and the valve seat surface is greater than a diameter of a guide bore of the sealing sleeve, in which the valve pin is guided.
  • Fig. 1 shows a detail of a first fuel injector according to the invention in the region of the control valve in longitudinal section and
  • Fig. 1 is a first inventive fuel! Njektor 1 shown in detail, as it is used in particular for self-igniting internal combustion engines for injection into the combustion chamber of the internal combustion engine.
  • a preferred use of the force stoffinjektors 1 is for a fuel injection system with a common rail, which leads the diesel fuel under high pressure to a plurality of fuel injectors 1.
  • the fuel injector 1 has a housing in which a throttle plate 2 and a valve plate 3 are arranged.
  • the throttle plate 2 has an end face 4.
  • the valve plate 3 has an end face 5, wherein the throttle plate 2 with its
  • End face 4 on the end face 5 of the valve plate 3 is present. Furthermore, the throttle plate 2 facing away from the front side 4, another end face 6.
  • the channel section 7 has an inlet throttle 9 formed in the throttle plate 2.
  • the control chamber 8 is bounded on the one hand by the end face 6 of the throttle plate 2, and on the other hand by an end face 10 of a nozzle needle 1 1 and laterally by a sleeve 12.
  • the sleeve 12 is located on the end face 6 of the throttle plate 2. According to the pressure in the control chamber 8, the nozzle needle 1 1 is held in a closed position or opened against the closing direction 13.
  • the pressure of the fuel in the control chamber 8 acts against a fuel pressure in a fuel chamber 14 and a Düsenfederspan- voltage. Due to the high pressure prevailing at the valve-chamber-side end of the guide gap 48, a slight leakage flow through the guide gap arises
  • the control valve 15 has a valve chamber 16 which is formed in the valve plate 3.
  • the valve chamber 16 is bounded by an inner wall 17, which is formed on the valve plate 3 and a sealing surface 18, which is part of the end face 4 of the throttle plate 2.
  • valve pin 20 In the valve chamber 16, a sealing sleeve 19 and at least partially a valve pin 20 are arranged.
  • the valve pin 20 is guided in a guide bore 22 of the sealing sleeve 19.
  • the control valve 15 has a longitudinal axis 23 along which the valve pin 20 can be actuated.
  • the valve plate 3 has a recess 24 into which a Abiaufbohrung 25 opens.
  • the Abiaufbohrung 25 is connected via the recess 24 on the one hand with the valve chamber 16. On the other hand, the Abiaufbohrung 25 opens into the control room 8. Die
  • Abiaufbohrung 25 has an outlet throttle 26.
  • the Abiaufbohrung connects 25 the control chamber 8 with the valve chamber 16.
  • the Abiaufbohrung 25 is formed with the outlet throttle 26 in this embodiment in the throttle plate 2.
  • a low pressure area in the form of a pressure-relieved space 27 is also formed, which is connected via a return passage 28 with a low pressure return or the like.
  • the pressure-relieved space 27 thus forms a low-pressure region.
  • a guide member 29 for a compression spring 30 is arranged in the pressure-relieved space 27.
  • the guide element 29 has a pin-shaped guide section 31, which is radially encompassed by the compression spring 30.
  • the guide element 29 In the direction of the bottom 32 of the pressure-relieved space 27, which is designed in the form of a blind hole, the guide element 29 has a spring support element 33, which is integrally formed on the guide section 31.
  • the spring support element 33 has on the bottom 32 of the pressure-relieved space 27 side facing a radially encircling chamfer 34.
  • the compression spring 30 is supported with its one end face against the spring support element 33 and with its other end face against a disc-shaped transfer body 35 from.
  • Both the transmission body 35, and the spring support element 33 have a diameter which is preferably only slightly smaller than the inner diameter of the pressure-relieved space 27, in the transition region between its radially encircling inner wall toward the base 32 with a rounded edge 36 in the region Bevel 34 is formed.
  • the sealing sleeve 19 has on the compression spring 30 facing the end face a radially circumferential biting edge 38 which bears sealingly against the end face 4 of the throttle plate 2.
  • the valve plate 3 has a partially conical contact surface 40. Furthermore, a valve seat surface 41, which is part of the conical contact surface 40, is formed on the valve plate 3. The valve pin 20 acts with the valve seat surface 41 to a sealing seat
  • a fuel gap 46 is formed between the inner wall 17 and an outer side 45 of the sealing sleeve 19, a fuel gap 46 is formed.
  • the fuel gap 46 is formed as an annular fuel gap 46. Via the fuel gap 46, the fuel passes from the Abiaufbohrung 25 to a passage gap 47 in the region of the conical contact surface 40. About the passage gap 47 of the fuel in turn passes into a guide gap 48 which is formed between the sealing sleeve 19 and the valve pin 20.
  • the actuation of the valve pin 20 is effected by an actuator 55, which acts on a transition piece 59 against the closing direction 43.
  • the actuator 55 can as
  • Piezoelectric actuator (preferably with hydraulic coupler) or be designed as a magnetic actuator.
  • an enlarged diameter portion 60 of the valve pin 20 cooperates with its underside 61 at least indirectly with the sealing sleeve 19.
  • a dial 65 is arranged between the bottom 61 and the portion 60 facing end face of the sealing sleeve 19.
  • the thickness 66 of the dial 65 results from the geometric dimensions of the valve chamber 16, in particular the height between the end 4 to the valve seat 41 and the height of the sealing sleeve 19. It is essential that in the open position of the valve pin 20, in the actuated actuator 55 the bottom 61 of the valve pin 20 rests on the top of the dial 65, between the compression spring 30 facing bottom of the transfer body 35 and the guide member 29 still a gap 67 remains.
  • valve pin 20 and the adjusting disk 65 and / or between the adjusting disk 65 and the sealing sleeve 19 are particularly advantageous to provide at least one contact surface between the valve pin 20 and the adjusting disk 65 and / or between the adjusting disk 65 and the sealing sleeve 19 with at least one radially circumferential groove which can not be seen in the illustration of FIG. In this way it is achieved that even with the control valve 15 open, that is located at its stroke stop valve pin 20, the valve-chamber-side end of the fuel gap 48 is hydraulically connected to the valve chamber 16. In this way, a hydraulic bonding between the valve pin 20 and the sealing sleeve 19 is avoided.
  • the guide element 29 a has only one spring receiving element 33 a, but no guide section 31 corresponding to the fuel injector 1.
  • the fuel injectors 1, 1 a and 1 b described so far can be modified or modified in many ways, without departing from the spirit of the invention.
  • This is to adjust the stroke stop for the valve pin 20 in its open position by a corresponding dimensioning of the sealing sleeve 19, but in particular by the dimensioning of a dial 65 which is disposed between the sealing sleeve 19 and the throttle plate 2 and the pressure-relieved space 27. So it is also within the scope of the invention to dispense with the dial 65, and form the stroke limiter of the valve pin 20 by a correspondingly accurate production of the length or height of the sealing sleeve 19.
  • the contact surfaces between the sealing sleeve 19 and the shim 65 and / or between the shim 65 and the valve pin 20 may each be flat or conical.
  • the cone angles can each be selected such that a true contact surface is formed, but also in such a way that a contact line is formed.

Landscapes

  • 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)

Abstract

L'invention concerne un injecteur de carburant (1; 1a; 1b), en particulier pour des moteurs à combustion interne à auto-allumage, comprenant une soupape de commande (15) et une chambre de commande (8) qui communique avec une chambre de soupape (16) de la soupape de commande (15) par l'intermédiaire d'un orifice de sortie (25), une tige de soupape (20) étant disposée dans la chambre de soupape (16) et sollicitée, dans une première position, par la force d'un ressort de compression (30) dans une position de fermeture dans laquelle elle coopère avec une face de siège de soupape (41), le ressort de compression (30) étant disposé dans une zone basse pression (27) étanche par rapport à la chambre de soupape (16), la course d'ouverture de la tige de soupape (20) pouvant être réglée pour une deuxième position dans laquelle la tige de soupape (20) est située à distance de la face de siège de soupape (41), la tige de soupape (20) étant guidée dans la chambre de soupape (20) par une douille d'étanchéité (19) entourant radialement ladite tige de soupape (20). Selon l'invention, la course d'ouverture de la tige de soupape (20) est réalisée par application au moins indirecte de la tige de soupape (20) sur la douille d'étanchéité (19).
PCT/EP2012/059532 2011-06-30 2012-05-23 Injecteur de carburant WO2013000635A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12723454.0A EP2726731B1 (fr) 2011-06-30 2012-05-23 Injecteur de carburant
CN201280032552.XA CN103635686B (zh) 2011-06-30 2012-05-23 燃料喷射器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110078400 DE102011078400A1 (de) 2011-06-30 2011-06-30 Kraftstoffinjektor
DE102011078400.4 2011-06-30

Publications (1)

Publication Number Publication Date
WO2013000635A1 true WO2013000635A1 (fr) 2013-01-03

Family

ID=46149446

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/059532 WO2013000635A1 (fr) 2011-06-30 2012-05-23 Injecteur de carburant

Country Status (4)

Country Link
EP (1) EP2726731B1 (fr)
CN (1) CN103635686B (fr)
DE (1) DE102011078400A1 (fr)
WO (1) WO2013000635A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640604A1 (fr) * 2004-09-23 2006-03-29 Siemens Aktiengesellschaft Servovalve et soupape d'injection
DE102009002742A1 (de) * 2009-04-30 2010-11-04 Robert Bosch Gmbh Kraftstoff-Injektor
DE102010040874A1 (de) * 2010-09-16 2012-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102010063540A1 (de) 2010-12-20 2012-06-21 Robert Bosch Gmbh Brennstoffeinspitzventil

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19618698A1 (de) * 1996-05-09 1997-11-13 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102007035698A1 (de) * 2007-07-30 2009-02-05 Robert Bosch Gmbh Kraftstoffeinspritzventil mit verbesserter Dichtheit am Dichtsitz eines druckausgeglichenen Steuerventils

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640604A1 (fr) * 2004-09-23 2006-03-29 Siemens Aktiengesellschaft Servovalve et soupape d'injection
DE102009002742A1 (de) * 2009-04-30 2010-11-04 Robert Bosch Gmbh Kraftstoff-Injektor
DE102010040874A1 (de) * 2010-09-16 2012-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102010063540A1 (de) 2010-12-20 2012-06-21 Robert Bosch Gmbh Brennstoffeinspitzventil

Also Published As

Publication number Publication date
EP2726731A1 (fr) 2014-05-07
CN103635686B (zh) 2016-08-24
CN103635686A (zh) 2014-03-12
EP2726731B1 (fr) 2015-07-08
DE102011078400A1 (de) 2013-01-03

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