EP2412965A2 - Soupape d'injection de combustible - Google Patents

Soupape d'injection de combustible Download PDF

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Publication number
EP2412965A2
EP2412965A2 EP11170708A EP11170708A EP2412965A2 EP 2412965 A2 EP2412965 A2 EP 2412965A2 EP 11170708 A EP11170708 A EP 11170708A EP 11170708 A EP11170708 A EP 11170708A EP 2412965 A2 EP2412965 A2 EP 2412965A2
Authority
EP
European Patent Office
Prior art keywords
valve
intermediate plate
chamber
fuel injection
plate
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Withdrawn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
EP11170708A
Other languages
German (de)
English (en)
Other versions
EP2412965A3 (fr
Inventor
Bernd Streicher
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 EP2412965A2 publication Critical patent/EP2412965A2/fr
Publication of EP2412965A3 publication Critical patent/EP2412965A3/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Withdrawn legal-status Critical Current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
    • 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
    • F02M63/0047—Four-way valves or valves with more than four ways
    • 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
    • F02M63/0077—Valve seat details

Definitions

  • the invention relates to a fuel injection valve for fuel injection systems of internal combustion engines. Specifically, the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
  • an injector for injecting fuel into combustion chambers of internal combustion engines which can be configured in particular as a piezo-controlled common rail injector.
  • the known injector comprises an injector body, in which a piezoactuator is arranged which actuates a control valve received in a valve plate via at least one booster piston.
  • a nozzle body is provided, at its brennraum workedem free end, a nozzle outlet is formed, wherein an end face of a nozzle needle, which is axially movable or actuated in a longitudinal recess of the nozzle body, with a rear, the nozzle exit end facing away from the longitudinal recess between the nozzle body and Control valve arranged throttle plate, which can form an opening stop for the nozzle needle, cooperating and thus limit the opening stroke of the nozzle needle.
  • a trained between the rear nozzle needle end face and the throttle disc control chamber is provided which is in hydraulic communication with a pressure supply serving for the pressure port.
  • the control valve has a valve pin with a valve body, which is acted upon by a valve spring against a valve seat surface.
  • the sealing seat between the valve body and the valve seat surface is controllable to secrete fuel controlled from a valve chamber of the control valve in a low pressure region.
  • the valve pin serves to close or release a bore which serves as a bypass bore and can be guided via the high-pressure fuel into the valve chamber.
  • valve pin is guided in a sealing sleeve arranged in the valve chamber and the pressure equalization to the low pressure is realized instead of the bypass.
  • the sealing sleeve can tilt or lift off from an adjacent plate, resulting in a sudden leakage and unwanted malfunction of the injector.
  • a closing behavior of the switching valve may be impaired by an axial offset.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that an improved design and an improved mode of action are possible. Specifically, a reliable operation of the control valve is ensured over the life of the fuel injection valve. In addition, a volume of the valve space of the control valve can be reduced, whereby a reduced control amount is reduced and a response of the valve needle are improved.
  • an end face of a guided in the guide bore of the intermediate plate portion of the valve pin is arranged in a low pressure space.
  • the low-pressure space in which the end face of the valve pin is arranged is at least partially formed by a recess in the intermediate plate, which adjoins the guide bore of the intermediate plate.
  • the valve pin is relieved of pressure on its end face.
  • the valve pin may be pressure-relieved on the side of the valve body facing away from the end face within the sealing seat, so that at least approximately a pressure-balanced control valve can be realized.
  • actuation of the control valve can be effected by relatively small adjusting forces.
  • the drain hole is at least partially configured in the intermediate plate.
  • the drain hole may be configured as a throttle bore.
  • the throttle can be configured in the intermediate plate.
  • the throttle of the throttle bore is configured in another, in particular an adjacent, plate.
  • a filling bore is provided which connects the valve space with a fuel space and that the filling bore is at least partially configured in the intermediate plate.
  • a throttle of the filling bore can be configured in the intermediate plate. This results a compact construction.
  • control valve in which a small volume of the valve chamber can be realized.
  • an advantageous switching behavior may also be achieved without a filling bore, for example, to achieve a rapid closing of a nozzle needle by rapid pressure build-up in the control chamber.
  • a valve plate is provided, that the valve space is at least partially designed in the valve plate and that the valve seat surface is configured on the valve plate. Furthermore, it is advantageous that the intermediate plate and the valve plate are positioned relative to one another by means of at least one dowel pin. Thereby, a positioning of the guide bore of the intermediate plate is achieved relative to the valve seat surface of the valve plate, so that the valve body of the valve pin is centered with respect to the valve seat surface and thus a reliable opening and closing of the sealing seat is ensured.
  • the valve seat surface is designed as a flat seat at least in the region of the sealing seat between the valve body and the valve seat surface. This makes a certain tolerance compensation possible, so that a positioning of the intermediate plate relative to the valve plate via dowel pins or the like is not necessarily required. This also simplifies the assembly of the fuel injection valve.
  • valve body has a valve seat surface facing, circumferential sealing edge which cooperates with the valve seat surface to the sealing seat.
  • an annular sealing edge may be configured on the valve body.
  • the spring element is supported on the one hand on a contact surface of the valve body and on the other hand on the side of the intermediate plate which limits the valve space, and that the spring element acts on the valve body against the valve seat surface.
  • the spring element encloses the valve pin sections.
  • a throttle plate is provided, that the intermediate plate has a further side facing away from the side of the intermediate plate, which limits the valve space, and that the throttle plate rests against the further side of the intermediate plate.
  • the intermediate plate may be arranged between the valve plate and the throttle plate.
  • Fig. 1 shows a first embodiment of a fuel injection valve 1 of the invention in a schematic, partial sectional view.
  • the fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • the fuel injection valve 1 has a holding body 2, a nozzle body 3 and a nozzle retaining nut 4, which connects the nozzle body 3 with the holding body 2. Between a side 5 of the holding body 2 and a side 6 of the nozzle body 3, a valve plate 7, an intermediate plate 8 and a throttle plate 9 are arranged.
  • the intermediate plate 8 serves, inter alia, as a guide plate 8.
  • a page 10 of the valve plate 7 on the side 5 of the holder body 2 at.
  • One side 11 of the valve plate 7, which faces away from the side 10 of the valve plate 7, abuts against one side 12 of the intermediate plate 8.
  • a compact structure and easy installation are possible.
  • On the side 11 of the valve plate 7 a plurality of bores 16, 16 'are provided.
  • On the side 12 of the intermediate plate 8 a plurality of bores 17, 17 'are provided which are positioned with respect to the bores 16, 16'.
  • the dowel pin 18 engages on the one hand in the bore 16 of the valve plate 7 and on the other hand in the bore 17 of the intermediate plate 8 a.
  • the valve plate 7 and the intermediate plate 8 are positioned to each other.
  • the fuel injection valve 1 has a fuel channel 20, which extends in sections through the holding body 2, partially through the valve plate 7 and partially through the intermediate plate 8. From the fuel channel 20 branch off a bore 21 and an inlet bore 22 with an inlet throttle 23, which are configured in the throttle plate 9.
  • the bore 21 opens into a fuel chamber 24 of the nozzle body 3, which is bounded by the side 15 of the throttle plate 9.
  • a nozzle needle 25 is arranged, which is partially surrounded by a sleeve 26.
  • an end face 28 of the nozzle needle 25 and the side 15 of the throttle plate 9 a control chamber 27 is formed.
  • the control chamber 27 is filled via the inlet bore 22 with the inlet throttle 23 with fuel under high pressure.
  • the nozzle needle 25 is pressed into its sealing seat, not shown, so that the fuel injection valve 1 is closed.
  • the fuel chamber 24 is filled via the bore 21 with high pressure fuel.
  • the fuel injection valve 1 has a control valve 30.
  • the control valve 30 comprises a valve chamber 31 having an input region 32 and a further input region 33.
  • a drain bore 34 is provided for the control chamber 27, which opens on the one hand into the control chamber 27 and on the other hand into the inlet region 32 of the valve chamber 31.
  • the drain hole extends in sections through the throttle plate 9 and partially through the intermediate plate 8.
  • the drain hole 34 is as a drain throttle 34th designed with a throttle 35.
  • the valve chamber 31 is filled with high pressure fuel from the control chamber 27.
  • a filling bore 36 is also provided with a Ruddrossel 37, which extends in sections through the intermediate plate 8 and partially through the throttle plate 9.
  • the filling bore 36 opens on the one hand into the fuel chamber 24 and on the other hand into the inlet region 33 of the valve chamber 31. Via the filling bore 36, a bypass is formed, via which refueling of fuel into the valve chamber 31 is made possible.
  • the control valve 30 has a valve pin 38 with a valve body 39. On the valve plate 7, a valve seat 39 facing the valve body 39 is formed. The valve body 39 forms a sealing seat 41 with the valve seat surface 40. In addition, part of a low-pressure space 42 is configured in the valve plate 7. When the sealing seat 41 is closed, the connection between the valve chamber 31 and the low-pressure chamber 42 is blocked.
  • the fuel injection valve has an actuator 43, which may be configured, for example, as a piezoelectric actuator.
  • the actuator 43 acts on the valve body 39 via an actuating piston 44.
  • the sealing seat 41 is opened, so that fuel can flow out of the valve chamber 31 into the low-pressure chamber 42. In this case, a certain amount of tax is canceled.
  • the control amount is at least substantially refilled via the drain hole 34 from the control chamber 27. This results in a pressure reduction or a collapse of the pressure in the control chamber 27. This reduces the force acting on the end face 28 of the nozzle needle 25 compressive force, so that the nozzle needle 25 opens and fuel is injected into a combustion chamber of an internal combustion engine or the like.
  • a spring element 45 is also arranged, which is designed as a valve spring 45.
  • the sealing seat 41 is closed again via the spring element 45.
  • the fuel flowing into the valve chamber 31 thus causes a pressure build-up in the valve chamber 31. This can be accelerated via the filling bore 36.
  • the pressure builds up in the control chamber 27, whereby the nozzle needle 25 is actuated in the closing direction. This ends the injection process.
  • the intermediate plate 8 has a guide bore 51, whose axis 50 is the valve axis 50. In the guide bore 51 of the valve pin 38 is guided in sections.
  • the symmetry axis 50 of the valve seat surface 40 is likewise equal to the valve axis 50. In this way, alignment of the valve body 39 with respect to the valve seat surface 40 is always ensured.
  • valve chamber 31 is limited in this embodiment by the valve seat surface 40, the valve seat surface 40 facing side 12 of the intermediate plate 8 and by an at least partially cylinder jacket-shaped wall 52 of a recess for forming the valve chamber 31 in the valve plate 7.
  • the valve pin 38 has a portion 53, on which the valve pin 38 is guided in the guide bore 51.
  • An end face 54 of the section 53 is arranged in a low-pressure space 55, which in this exemplary embodiment is formed by a countersink on the side 13 of the intermediate plate 8.
  • the low-pressure chamber 55 is connected via a return bore 56 with a low-pressure bore 57.
  • the valve pin 38 is depressurized on the one hand from the end face 54 and on the other hand from the low-pressure chamber 42.
  • an at least approximately pressure compensated control valve 30 can be realized.
  • a maximum stroke of the valve body 39 when opening the sealing seat 41 is predetermined in this embodiment by striking the end face 54 on the side 14 of the throttle plate 9. Over the length of the portion 53 of the valve pin 38 can thus be done adjusting the maximum opening stroke.
  • the low-pressure space 55 is formed by a countersink 55.
  • the low-pressure chamber 55 can also be configured by a different recess in the intermediate plate 8.
  • the low-pressure chamber 55 is thereby limited by the side 14 of the throttle plate 9.
  • the low-pressure space 55 adjoins the guide bore 51 of the intermediate plate 8.
  • the volume of the valve chamber 31 can be made relatively small.
  • the filling bore 36 with the filling throttle 37 can be dispensed with.
  • the replenishment of the rejected fuel quantity, which is deactivated via the opened sealing seat 41 from the valve chamber 31 into the low-pressure chamber 42, then takes place exclusively via the drain hole 34 from the control chamber 27. This allows a bypass can be saved. In addition, this effectively effectively reduces the amount of rejected fuel so that the efficiency is improved.
  • valve spring 45 is supported on the one hand on a contact surface 58 of the valve body 39 and on the other hand on the side 12 of the intermediate plate 8. As a result, a space-optimized arrangement of the valve spring 45 in the valve chamber 31 is made possible.
  • a fuel injection valve 1 can be realized, the smallest quantities is capable of injecting small amounts of fuel into a combustion chamber with short actuations of the nozzle needle 25.
  • a short needle closing time for the nozzle needle 25 can also be achieved without filling throttle 37.
  • the reliable guidance of the valve pin 38 and thus also of the valve body 39 in the intermediate plate 8 ensures reliable operation, so that in particular sudden leaks or undesired malfunctions are prevented. Specifically, a tilting of the valve body 39 is prevented by principle.
  • a miniaturization capability of the fuel injection valve can be achieved by reducing the map slope. Furthermore, by eliminating the filling throttle 37, the efficiency of the fuel injection system can be improved, whereby temperature loads are reduced. In addition, control and leakage quantities are reduced.
  • the valve plate 7, the intermediate plate 8 and the throttle plate 9 may be joined to each other and with respect to the adjacent holding body 2 and the adjacent nozzle body 3 with hard seals together.
  • Fig. 2 shows the in Fig. 1 labeled II section of a fuel injector 1 according to a second embodiment in an excerpt, schematic sectional view.
  • the valve plate 7 has a flat valve seat surface 40, which is oriented perpendicular to the valve axis 50.
  • the valve seat surface 40 is thereby parallel to the side 12 of the intermediate plate 8 (FIG. Fig. 1 ) oriented.
  • the valve body 39 has a peripheral sealing edge 60 facing the valve seat surface 40, which cooperates with the valve seat surface 40 to the sealing seat 41.
  • the valve seat surface 40 in the region of the sealing seat 41 between the valve body 39 and the valve seat surface 40 is designed as a flat seat.
  • an offset of the valve body 39 with respect to the valve axis 50 tolerated in which an axis of the valve pin 38 is oriented parallel to the valve axis 50.
  • This is for example the case when the valve plate 7 and the intermediate plate 8 are mounted slightly offset from one another.

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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)
EP11170708.9A 2010-07-27 2011-06-21 Soupape d'injection de combustible Withdrawn EP2412965A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010038451 DE102010038451A1 (de) 2010-07-27 2010-07-27 Brennstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP2412965A2 true EP2412965A2 (fr) 2012-02-01
EP2412965A3 EP2412965A3 (fr) 2014-05-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11170708.9A Withdrawn EP2412965A3 (fr) 2010-07-27 2011-06-21 Soupape d'injection de combustible

Country Status (2)

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EP (1) EP2412965A3 (fr)
DE (1) DE102010038451A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106762289A (zh) * 2017-01-18 2017-05-31 哈尔滨工程大学 蓄压孔板式电控喷油器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015220056A1 (de) * 2015-10-15 2017-04-20 Continental Automotive Gmbh Piezoinjektor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10353169A1 (de) 2003-11-14 2005-06-16 Robert Bosch Gmbh Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen, insbesondere piezogesteuerter Common-Rail-Injektor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0999360A1 (fr) * 1998-11-05 2000-05-10 Siemens Aktiengesellschaft Soupape de commande de dosage de fluide
DE102008001330A1 (de) * 2008-04-23 2009-10-29 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102008040170A1 (de) * 2008-07-04 2010-01-07 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102009027709A1 (de) * 2009-07-15 2011-01-20 Robert Bosch Gmbh Kraftstoffeinspritzventil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10353169A1 (de) 2003-11-14 2005-06-16 Robert Bosch Gmbh Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen, insbesondere piezogesteuerter Common-Rail-Injektor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106762289A (zh) * 2017-01-18 2017-05-31 哈尔滨工程大学 蓄压孔板式电控喷油器

Also Published As

Publication number Publication date
DE102010038451A1 (de) 2012-02-02
EP2412965A3 (fr) 2014-05-07

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