EP3611368A1 - Ensemble de soupape et soupape d'injection de carburant - Google Patents

Ensemble de soupape et soupape d'injection de carburant Download PDF

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Publication number
EP3611368A1
EP3611368A1 EP18189227.4A EP18189227A EP3611368A1 EP 3611368 A1 EP3611368 A1 EP 3611368A1 EP 18189227 A EP18189227 A EP 18189227A EP 3611368 A1 EP3611368 A1 EP 3611368A1
Authority
EP
European Patent Office
Prior art keywords
armature
valve
needle
valve needle
engagement area
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Withdrawn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
EP18189227.4A
Other languages
German (de)
English (en)
Inventor
Mauro Grandi
Valerio Polidori
Stefano Filippi
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.)
Vitesco Technologies GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP18189227.4A priority Critical patent/EP3611368A1/fr
Publication of EP3611368A1 publication Critical patent/EP3611368A1/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Withdrawn legal-status Critical Current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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other

Definitions

  • the present invention relates to a valve assembly for an injection valve and to an injection valve, e.g. a fuel injection valve of a vehicle. It particularly relates to solenoid injection valves.
  • injection valves according to the "free-lift” design comprise a disc-shaped element, sometimes called “hydro-disc”, which is arranged in an axial region of the valve needle facing towards the fluid outlet portion and fixedly connected to the valve needle.
  • Injection valves according to the "free-lift” design usually comprise at least two springs: The calibration spring acting on the valve needle, which biases the valve needle towards the fluid outlet portion, and a second spring, sometimes called “armature spring” or “free-lift spring”, which acts on the armature and couples the armature to the needle by biasing the armature towards a retaining element of the needle.
  • This design is rather complicated and involves a high number of parts, resulting in high costs, high weight of the injector and an elaborate assembly process.
  • a valve assembly for an injection valve comprising a valve body with a central longitudinal axis comprising a cavity with a fluid inlet portion and a fluid outlet portion.
  • the valve assembly further comprises a valve needle axially moveable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions.
  • the valve assembly comprises an armature of an electro-magnetic actuator unit being operable to actuate the valve needle.
  • the armature is axially displaceable relative to the valve body and has an axial play with respect to the valve needle.
  • the valve needle comprises a first engagement area and the armature comprises a second engagement area, the first engagement area and the second engagement area being able to provide a coupling - in particular a form-fit coupling by direct mechanical contact between the first and second engagement areas - between the armature and the needle, when the armature travels upwards.
  • the first engagement area and the second engagement area are spaced apart from each other in the closing position of the valve needle.
  • the valve assembly further comprises an armature retainer being fixedly coupled to the valve needle below the armature and a spring element biasing the valve needle towards the fluid outlet portion, the spring element being in direct contact with an upper side of the armature and acting on the valve needle by way of the armature retainer.
  • the armature retainer being fixedly coupled to the valve needle below the armature it is understood that the armature retainer is fixed to the needle on the side of the armature facing towards the fluid outlet portion.
  • the upper side of the armature is defined as the side facing towards the fluid inlet portion.
  • the valve assembly according to the present invention has the advantage that only one spring is needed to bias the valve needle towards the fluid outlet portion and to couple the armature to the needle.
  • the spring element is precompressed to bias the valve needle towards the closing position and, at the same time, open an axial gap between the first and second engagement areas by pressing the armature against the armature retainer when the electro-magnetic actuator is de-energized.
  • the valve needle comprises an annular protrusion on its upper end, the protrusion having an annular lower side facing towards the fluid outlet portion, the annular lower side providing the first engagement area.
  • the armature retainer may also be denoted as a lower retainer and the annular protrusion as an upper retainer.
  • the upper retainer and the lower retainer are located on opposite sides in axial direction of the armature.
  • the upper retainer and the lower retainer are distanced such that the armature has an axial play between the upper retainer and the lower retainer.
  • the annular protrusion is in one piece with a shaft of the valve needle. In other embodiments, it is a separate piece which is fixed to the shaft.
  • the armature has an at least generally flat upper side comprising an annular portion providing the second engagement area.
  • the armature comprises an annular recess in its upper side, the recess having an annular base area facing towards the fluid inlet portion, the annular base area providing the second engagement area.
  • the protrusion of the needle fits into the recess of the armature.
  • the annular portion or the annular base area, respectively, provide a form-fit coupling of the armature and the needle, when the free-lift gap is closed.
  • the first engagement area comes into contact with the second engagement area and the force of the armature traveling upwards acts on the valve needle across the engagement area, taking the needle upwards and thereby opening the valve.
  • the armature retainer is disc-shaped.
  • a disc-shaped armature retainer is sometimes known as a "hydro-disc” and can prevent or at least largely reduce bouncing of the needle:
  • the disc-shaped element limits the movement of the armature relative to the valve needle, and, when the valve needle is in the closing position, also relative to the valve body in direction towards the fluid outlet portion and therefore functions as an armature stop. Furthermore, it operates to dissipate kinetic energy of the armature during the closing-phase of the valve, because fluid is squeezed through the gap between the armature and the disc-shaped element.
  • the disc-shaped element helps to reduce bouncing of the needle and post-injections.
  • a lower end of the spring element is supported by the upper side of the armature, while an upper end of the spring element is supported by a calibration tube.
  • the calcibration tube may comprise a filter.
  • a fuel injection valve comprising the valve assembly.
  • the injection valve has the advantages described in connection with the valve assembly.
  • Figure 1 shows an injection valve 1 that is in particular suitable for dosing fuel to an internal combustion engine.
  • the injection valve 1 comprises in particular a valve assembly 3.
  • the valve assembly 3 comprises a valve body 4 with a central longitudinal axis L.
  • a housing 6 is partially arranged around the valve body 4 .
  • the valve body 4 comprises a cavity 9.
  • the cavity 9 has a fluid outlet portion 7.
  • the fluid outlet portion 7 communicates with a fluid inlet portion 5 which is provided in the valve body 4.
  • the fluid inlet portion 5 and the fluid outlet portion 7 are in particular positioned at opposite axial ends of the valve body 4.
  • the cavity 9 takes in a valve needle 11.
  • the valve needle 11 comprises a needle shaft 15 and a sealing ball 13 welded to the tip of the needle shaft 15.
  • valve needle 11 In a closing position of the valve needle 11, it sealingly rests on a seat plate 17 having at least one injection nozzle.
  • a preloaded calibration spring 18 exerts a force on the needle 11 towards the closing position.
  • the fluid outlet portion 7 is arranged near the seat plate 17.
  • the injection nozzle may be, for example, an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • the valve assembly 3 is provided with an electro-magnetic actuator unit 19.
  • the electro-magnetic actuator unit 19 comprises a coil 21, which is preferably arranged inside the housing 6. Furthermore, the electro-magnetic actuator unit 19 comprises an armature 23.
  • the housing 6, parts of the valve body 4 and the armature 23 form an electromagnetic circuit.
  • the actuator unit 19 further comprises a pole piece 25.
  • the armature 23 is axially movable in the cavity 9.
  • the needle 11 is guided by a central axial opening in the armature 23.
  • the armature 23 is axially movable relative to the valve needle 11, i.e. it may slide on the needle 11.
  • An armature retainer 43 is fixedly coupled to the valve needle 11 below the armature 23, i.e. on the side of the armature 23 facing towards the fluid outlet portion 7.
  • the armature retainer 43 is disc-shaped and may for example be welded to the needle 11.
  • the valve needle 11 comprises a protrusion 27 on its upper end 29.
  • the armature 23 comprises a recess 31 in its upper side 33.
  • the protrusion 27 and the recess 31 are shown in more detail in figure 2 .
  • the calibration spring 18 has a lower end 35 facing towards the fluid outlet portion 7, the lower end 35 being supported by the upper side 33 of the armature 23. Hence, the calibration spring 18 is in direct contact with the upper side 33 of the armature 23 and exerts a force directly on the armature.
  • An upper end 37 of the calibration spring 18 is supported by the calibration tube 39, which is fixedly arranged inside the cavity 9.
  • the calibration tube 39 may be press-fitted into a central opening of the pole piece 25.
  • the annular protrusion 27 of the valve needle 11 has an annular lower side facing towards the fluid outlet portion 7, the annular lower side providing a first engagement area 47.
  • the recess 31 has an annular base area facing towards the fluid inlet portion 5, the annular base area providing a second engagement area 49.
  • the calibration spring 18 When the coil 21 is de-energized, the calibration spring 18 is able to force the armature 23 to move in axial direction away from the fluid inlet portion and take the needle 11 with it into its closing position.
  • the net hydraulic load on the needle 11 works in the same direction as the force exerted by the calibration spring 18.
  • the needle 11 stops at the valve seat, while the armature 23 moves additionally in the direction of the armature retainer 43 to dissipate energy, opening up the gap 41.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP18189227.4A 2018-08-16 2018-08-16 Ensemble de soupape et soupape d'injection de carburant Withdrawn EP3611368A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18189227.4A EP3611368A1 (fr) 2018-08-16 2018-08-16 Ensemble de soupape et soupape d'injection de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18189227.4A EP3611368A1 (fr) 2018-08-16 2018-08-16 Ensemble de soupape et soupape d'injection de carburant

Publications (1)

Publication Number Publication Date
EP3611368A1 true EP3611368A1 (fr) 2020-02-19

Family

ID=63294038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18189227.4A Withdrawn EP3611368A1 (fr) 2018-08-16 2018-08-16 Ensemble de soupape et soupape d'injection de carburant

Country Status (1)

Country Link
EP (1) EP3611368A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090288640A1 (en) * 2008-05-22 2009-11-26 Mitsubishi Electric Corporation Fuel injection valve
US20160076499A1 (en) * 2014-09-17 2016-03-17 Denso Corporation Fuel injection valve
WO2017050616A1 (fr) * 2015-09-24 2017-03-30 Continental Automotive Gmbh Ensemble soupape pour soupape d'injection, et soupape d'injection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090288640A1 (en) * 2008-05-22 2009-11-26 Mitsubishi Electric Corporation Fuel injection valve
US20160076499A1 (en) * 2014-09-17 2016-03-17 Denso Corporation Fuel injection valve
WO2017050616A1 (fr) * 2015-09-24 2017-03-30 Continental Automotive Gmbh Ensemble soupape pour soupape d'injection, et soupape d'injection

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