EP2653712A1 - Injecteur de carburant avec électrovanne - Google Patents

Injecteur de carburant avec électrovanne Download PDF

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Publication number
EP2653712A1
EP2653712A1 EP13159239.6A EP13159239A EP2653712A1 EP 2653712 A1 EP2653712 A1 EP 2653712A1 EP 13159239 A EP13159239 A EP 13159239A EP 2653712 A1 EP2653712 A1 EP 2653712A1
Authority
EP
European Patent Office
Prior art keywords
fuel injector
solenoid valve
valve
seat
spring
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Withdrawn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
EP13159239.6A
Other languages
German (de)
English (en)
Inventor
Henning Kreschel
Kai Sutter
Andreas Rau
Andreas Gruenberger
Wilhelm Christ
Alexander VILLMANN
Matthias Horn
Thomas Schwarz
Wolfgang Stoecklein
Thomas Pauer
Stephan Amelang
Lorenz Zerle
Andreas Rettich
Markus Rueckle
Philipp Wachter
Marco Beier
Sven SIAUW
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 EP2653712A1 publication Critical patent/EP2653712A1/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Withdrawn legal-status Critical Current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
    • 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
    • F02M63/0021—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures
    • 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
    • F02M63/007—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
    • 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
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member

Definitions

  • the present invention relates to a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine having the features of the preamble of claim 1.
  • Such a fuel injector comprises a nozzle needle which is guided in a high-pressure bore of a nozzle body for releasing and closing at least one injection opening in a liftable manner and is acted upon in the direction of a sealing seat by the spring force of a closing spring.
  • the end facing away from the sealing seat of the nozzle needle thereby limits a control chamber, which is relieved via a solenoid valve.
  • a fuel injector of the type mentioned above for example, from the published patent application DE 10 2007 027 185 A1 out.
  • a fuel injector with a solenoid valve upon actuation of a valve element is placed from its seat or in his seat.
  • the valve element is used for pressure relief or the pressurization of a control chamber and thus the control of the movement of a nozzle needle of the fuel injector.
  • the fuel injector known from the prior art has a linear drive which operates on the basis of the Lorentz force.
  • the linear drive comprises an exchange coil and a magnet, for example a permanent magnet or an electromagnet, and acts in two directions as a function of the current direction.
  • the solenoid valve further comprises a valve element, which is presently spherical and can be lifted to relieve the control chamber via the linear drive from its seat.
  • the in this document proposed fuel injector is characterized in that compared to previously manufactured solenoid valves, a smaller number of items is required. By a smaller electrical time constant and smaller moving masses should be realized in this way a highly dynamic drive for a fuel injector. Furthermore, to be represented by the proposed solution, an inline solenoid valve.
  • the present invention seeks to provide a compact fuel injector, which is also inexpensive to produce.
  • a simply constructed designed as an inline solenoid injector fuel injector should be specified.
  • the proposed fuel injector comprises a nozzle needle, which is guided in a high-pressure bore of a nozzle body for releasing and closing at least one injection opening and is acted upon in the direction of a sealing seat by the spring force of a closing spring.
  • the end of the nozzle needle remote from the sealing seat delimits a control chamber.
  • the fuel injector comprises a solenoid valve, via which the control chamber is relieved.
  • the solenoid valve has a plunger armature cooperating with a flat seat and serving as a valve closing element. This may be formed in one or more parts, wherein the one-piece design is preferred. An additional, for example, bolt-shaped valve closing element can therefore be omitted, whereby the number of components is reduced.
  • the solenoid valve is simplified by the flat armature also serves as a valve closing element.
  • the plunger armature cooperates with a valve seat, which is designed here as a flat seat, which also leads to a simplification of the concept.
  • the plunger armature has a cooperating with the flat seat annular sealing contour or sealing surface.
  • the sealing contour or sealing surface is formed on a face of the plunger armature facing the flat seat.
  • the end face may be at least partially inclined with respect to the flat seat, so that possibly a line-shaped sealing contour, for example in the form of a biting edge, is formed.
  • the plunger armature is acted upon in the direction of the flat seat by the spring force of a spring.
  • the spring is preferably designed as a compression spring, for example as a helical compression spring and supported on a side facing away from the flat seat face of the plunger armature.
  • the flat seat is formed on a throttle plate and surrounds an outlet throttle having flow channel of the throttle plate.
  • the solenoid valve In the closed position of the solenoid valve thus prevents the voltage applied to the flat seat of the throttle plate sealing contour or sealing surface of the plunger armature relief of the control chamber, so that the prevailing control pressure holds the nozzle needle of the fuel injector in its sealing seat. Due to the small pressurized diameter to be sealed after the outlet throttle or the outlet channel, the clamping forces can be reduced.
  • the locking forces are realized only by the spring force of the spring, which act on the plunger armature in the direction of the flat seat.
  • the throttle plate which forms the flat seat, is further preferably arranged between the nozzle body and a valve plate for receiving the solenoid valve.
  • the solenoid valve is therefore only by the throttle plate and the drain channel formed therein from the control room separated, so that the tax oil requirement is further reduced.
  • a compact design in particular in the axial direction is created, which also has a high switching chain stiffness.
  • the magnetic valve comprises a magnetic core and a magnetic coil, wherein the magnetic core is substantially pot-shaped and at least partially receives the plunger armature and / or the spring.
  • This arrangement is particularly compact, since the plunger armature and / or the spring is or are at least partially received in the magnetic core.
  • the magnetic core can serve in this way at the same time the leadership of the plunger anchor.
  • the magnetic core can form a stop surface over which the stroke of the plunger armature can be limited.
  • the magnetic core is indirectly supported via an adjustment on an injector body. If the magnetic core itself forms a Ankerhubanschlag, can also be dispensed with an anchor stroke adjustment via a shim. In this case, the magnetic core is preferably supported directly on the injector body. In this way, the number of components can be further reduced and an even more compact construction arrangement can be achieved.
  • the fuel injector is designed as an inline solenoid valve injector.
  • an inline solenoid valve injector has a short switching chain, since the switching valve, in the present case in the form of a solenoid valve, is arranged in direct proximity to the nozzle needle.
  • the valve construction is complex and expensive to produce to exactly milled / paired geometries to realize the formation of a nearly pressure-balanced control valve, the present concept is characterized by its simplicity and associated low manufacturing costs.
  • the simplicity of the concept is due in particular to the fact that the valve seat is formed as a flat seat on the throttle plate. This results in an arrangement of the solenoid valve directly after the formed in the throttle plate and the outlet throttle having flow channel, resulting in small pressurized diameter to be sealed, which require low clamping forces.
  • the Indian FIG. 1 illustrated fuel injector is designed as an inline solenoid valve injector. That is, a solenoid valve 8 for controlling the movement of a nozzle needle 1 is disposed in close proximity thereto. In this way, a short switching chain and an improved response of the nozzle needle 1 is achieved.
  • the nozzle needle 1 is guided in a liftable manner in a high-pressure bore 2 of a nozzle body 3, so that over the stroke movement of the nozzle needle 1 at least one injection opening 4 formed in the nozzle body 3 can be opened or closed.
  • the nozzle needle 1 In order to release the at least one injection opening 4, the nozzle needle 1 must be lifted by a sealing seat 5, which in the present case has a conical shape and cooperates sealingly with a conical sealing surface formed on the nozzle needle.
  • the nozzle needle 1 For closing the at least one injection opening 4, the nozzle needle 1 is returned to the sealing seat 5.
  • the closing force required for this purpose is caused on the one hand by a closing spring 6, on the other hand by the control pressure of a control chamber 7, which is formed in the nozzle body 3 and is limited by the nozzle needle 1.
  • the nozzle needle 1 is thus acted upon directly by the control pressure in the control chamber 7.
  • the control pressure in the control chamber 7 must be lowered or the control chamber 7 to be relieved.
  • the Fuel injector, the solenoid valve 8, which in an enlarged view of FIG. 2 can be seen.
  • the solenoid valve 8 comprises a cup-shaped magnetic core 16 which is surrounded on the outer peripheral side by a magnetic coil 17 and is supported on an injector body 19 via a dial 18.
  • the injector body 19 abuts directly on a valve plate 15, in which the solenoid valve 8 is formed.
  • On the valve plate 15 is a throttle plate 12, in which a flow channel 14 is formed for the flow of the control amount from the control chamber 7.
  • the drainage channel 14 has an outlet throttle 13.
  • the drainage channel 14 opens directly into the control chamber 7.
  • the solenoid valve 8 facing top of the throttle plate 12 forms a valve seat in the form of a flat seat 9, which surrounds the drain passage 14.
  • a valve element of the solenoid valve 8 cooperates, which is designed in the present case as a plunger anchor 10.
  • the solenoid valve 8 has a spring 11, which is supported on the one hand on the plunger armature 10 and on the other hand on the magnetic core 16. Due to the cup shape of the magnetic core 16, the spring 11 is completely received in the magnetic core 16.
  • the plunger armature 10 is in the present case designed as a stepped piston and also received in the magnetic core 16 in the region of its smaller diameter.
  • the embodiment as a stepped piston serves to form an annular abutment surface which cooperates with a corresponding stop surface formed on the magnetic core 16.
  • the armature stroke is in this case via the shim 18, by means of which the magnetic core 16 supported on the injector 19, adjustable.
  • the magnetic coil 17 and the magnetic core 16 including the shim 18 are held in contact with the injector 19.
  • the plate spring 20 is for this purpose supported on the one hand on the coil 17, on the other hand on the throttle plate 12.
  • FIG. 2 shows that in this way a particularly compact structure arrangement of a solenoid valve or an inline solenoid valve injector can be realized. At the same time, the arrangement is characterized by a low number of components and by simply designed components.
  • the Inline arrangement of the solenoid valve 8 also leads to a short switching chain, which has a positive effect on the response of the nozzle needle.

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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)
EP13159239.6A 2012-04-16 2013-03-14 Injecteur de carburant avec électrovanne Withdrawn EP2653712A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210206213 DE102012206213A1 (de) 2012-04-16 2012-04-16 Kraftstoffinjektor mit Magnetventil

Publications (1)

Publication Number Publication Date
EP2653712A1 true EP2653712A1 (fr) 2013-10-23

Family

ID=47845865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13159239.6A Withdrawn EP2653712A1 (fr) 2012-04-16 2013-03-14 Injecteur de carburant avec électrovanne

Country Status (2)

Country Link
EP (1) EP2653712A1 (fr)
DE (1) DE102012206213A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3346121A1 (fr) * 2017-01-10 2018-07-11 Continental Automotive GmbH Électrovanne pour un système d'injection de carburant et pompe haute pression à carburant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1667177A1 (fr) * 2003-09-17 2006-06-07 Hitachi Powdered Metals Co., Ltd. Mandrin de metal mobile fritte et son procede de fabrication
DE102006021735A1 (de) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Magnetventil mit geflutetem Ankerraum
DE102008041595A1 (de) * 2008-08-27 2010-03-04 Robert Bosch Gmbh Quetschspalt zur hydraulischen Dämpfung
EP2530293A1 (fr) * 2011-05-30 2012-12-05 Robert Bosch Gmbh Injecteur de carburant
WO2013026611A1 (fr) * 2011-08-25 2013-02-28 Robert Bosch Gmbh Injecteur pour un fluide doté d'une alimentation en fluide

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007027185A1 (de) 2007-06-13 2009-01-08 Robert Bosch Gmbh Kraftstoffinjektor mit Linearantrieb

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1667177A1 (fr) * 2003-09-17 2006-06-07 Hitachi Powdered Metals Co., Ltd. Mandrin de metal mobile fritte et son procede de fabrication
DE102006021735A1 (de) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Magnetventil mit geflutetem Ankerraum
DE102008041595A1 (de) * 2008-08-27 2010-03-04 Robert Bosch Gmbh Quetschspalt zur hydraulischen Dämpfung
EP2530293A1 (fr) * 2011-05-30 2012-12-05 Robert Bosch Gmbh Injecteur de carburant
WO2013026611A1 (fr) * 2011-08-25 2013-02-28 Robert Bosch Gmbh Injecteur pour un fluide doté d'une alimentation en fluide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3346121A1 (fr) * 2017-01-10 2018-07-11 Continental Automotive GmbH Électrovanne pour un système d'injection de carburant et pompe haute pression à carburant
US10280888B2 (en) 2017-01-10 2019-05-07 Cpt Group Gmbh Solenoid valve for a fuel injection system, and high pressure fuel pump

Also Published As

Publication number Publication date
DE102012206213A1 (de) 2013-10-17

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