EP3875747A1 - Ventilanordnung für ein einspritzventil sowie einspritzventil - Google Patents

Ventilanordnung für ein einspritzventil sowie einspritzventil Download PDF

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Publication number
EP3875747A1
EP3875747A1 EP20161453.4A EP20161453A EP3875747A1 EP 3875747 A1 EP3875747 A1 EP 3875747A1 EP 20161453 A EP20161453 A EP 20161453A EP 3875747 A1 EP3875747 A1 EP 3875747A1
Authority
EP
European Patent Office
Prior art keywords
armature
valve
cavity
valve body
outlet portion
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.)
Pending
Application number
EP20161453.4A
Other languages
English (en)
French (fr)
Inventor
Stefano Filippi
Valerio Polidori
Mauro Grandi
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
Vitesco Technologies 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 Vitesco Technologies GmbH filed Critical Vitesco Technologies GmbH
Priority to EP20161453.4A priority Critical patent/EP3875747A1/de
Publication of EP3875747A1 publication Critical patent/EP3875747A1/de
Pending 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
    • F02M51/0671—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 having an elongated valve body attached thereto
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1846—Dimensional characteristics of discharge orifices

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 for pre-combustion injections.
  • An injector suitable for pre-combustion injections needs to work well at a limited pressure, for example at about 100 to 200 bar. Furthermore, the amount of fuel injected and the intended spray formation differ from standard injectors. While standard injectors working at pressures of about 350 to 500 bar typically have a minimum dynamic flow of 1 mg per stroke, for a pre-combustion injection a flow of only 0,1 to 0,3 mg per stroke is required.
  • a valve assembly for an injection valve for pre-combustion injections comprises a valve body with a longitudinal axis L, the valve body comprising a cavity with a fluid inlet portion and a fluid outlet portion.
  • the valve assembly further comprises a valve needle axially movable 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 at least one opening position.
  • the valve assembly further comprises an electromagnetic actuator unit designed to actuate the valve needle.
  • the electromagnetic actuator unit comprises an armature axially movable in the cavity and joined to the valve needle.
  • the armature has an upper side facing towards the fluid inlet portion and a lower side facing towards the fluid outlet portion.
  • the essentially cylindrical armature furthermore has a circumferential sidewall facing towards the valve body.
  • the electromagnetic actuator unit further comprises a pole piece, towards which the armature is movable into the at least one opening position.
  • the armature divides the cavity into an upper part adjacent to the upper side of the armature and a lower part adjacent to the lower side of the armature.
  • the only fluid path between the upper part and the lower part is provided by a gap between the sidewall of the armature and the valve body.
  • a width of the gap is smaller than or equal to 5 ⁇ m.
  • the fluid outlet portion comprises an opening with a diameter d of less than 80 ⁇ m.
  • the opening is in particular a single opening. If there is more than one opening provided at the fluid outlet portion, the diameter d indicates the sum of the diameters of these openings.
  • the valve assembly according to the invention has the advantage, that it is suitable to provide a fuel spray with limited penetration and a limited injection quantity as required for pre-combustion. This is achieved by the ballistic motion of the armature in combination with the nozzle design as follows: The initial pressure in the lower part of the cavity in combination with the geometry of the opening itself controls the flow out of the opening. The small diameter d of the opening results in a limited penetration of the spray and a limited quantity of injected fuel.
  • valve assembly is particularly well suited for pre-combustion injectors.
  • the width b of the gap between the sidewall of the armature and the valve body is 1 ⁇ b ⁇ 3 ⁇ m.
  • the opening is tilted with respect to the longitudinal axis L of the valve body.
  • a longitudinal axis I of the opening is not parallel to the longitudinal axis L of the valve body.
  • the opening may, on an inner side of the valve body, be in a central position, while on the outside of the valve body, it is in a position somewhat peripheral.
  • the longitudinal axis I of the opening and the longitudinal axis L of the valve body intersect at an angle, where the opening is positioned on the inner side of the valve body.
  • a maximum lift of the valve needle is preferably less than 30 ⁇ m, for example 20 ⁇ m, which is about half the lift of a standard injector.
  • an injection valve for pre-combustion injections is provided with the described valve assembly.
  • the injection valve is particularly well suited for pre-combustion injections due to the spray geometry and the low spray penetration.
  • Figure 1 shows an injection valve 1 that is in particular suitable for dosing fuel into an internal combustion engine in a pre-combustion injection.
  • the injection valve 1 comprises in particular a valve assembly 2.
  • the valve assembly 2 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 a single opening functioning as an injection nozzle.
  • a preloaded calibration spring 18 exerts a force on the needle 11 towards a closing position.
  • the fluid outlet portion 7 is arranged near the seat plate 17. In the closing position of the valve needle 11 a fluid flow through the opening is prevented.
  • the valve assembly 2 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 are forming an electromagnetic circuit.
  • the actuator unit 19 further comprises a pole piece 25.
  • the armature 23 is axially movable in the cavity 9.
  • the armature 23 is, in this embodiment, fixed to the valve needle 11 and is axially movable relative to the valve body 4.
  • the armature 23, which is shown in more detail in figure 2 has an essentially cylindrical shape with an upper side 27, a lower side 29 and the circumferential sidewall 31.
  • a gap 37 is arranged between the sidewall 31 of the armature 23 and the valve body 4.
  • the gap 37 has a width b of not more than 5 ⁇ m.
  • the gap 37 provides the only fuel path between the upper part 33 and the lower part 35 of the cavity 9.
  • the armature 23 divides the cavity 9 in an upper part 33 and a lower part 35.
  • the upper part 33 of the cavity 9 extends from the fluid inlet portion 5 to the upper side 27 of the armature 23.
  • the lower part 35 of the cavity 9 extends from the lower side 29 of the armature 23 to the fluid outlet portion 7.
  • FIG 3 shows a detail of figure 1 in the region of the fluid outlet portion 7.
  • the injection nozzle is shown as a single opening 39 with a longitudinal axis I and a diameter d.
  • the opening 39 extends from an inner side 41 of the seat plate 17 to an outer side 43.
  • the longitudinal axis I of the opening 39 and the longitudinal axis L of the valve body 4 intersect where the opening 39 is positioned on the inner side 41 of the seat plate 17.
  • the opening 39 extends from the centre of the seat plate 17 outwards.
  • the armature 23 When the injection valve 1 is operated and the coil 21 is energised, the armature 23 experiences a force upwards towards the pole piece 25. While moving upwards, the armature 23 takes the needle 11 with it and lifts the sealing ball 13 off the seat plate 17, unblocking the opening 39.
  • the pressure drop has several effects. Firstly, the decreasing pressure in the lower part 35 limits the quantity of fuel injected. Furthermore, the pressure drop results in a dampening of the upwards motion of the armature 23.
  • the armature 23 starts moving downwards, taking the needle 11 with it. Once again, the motion of the armature 23 is dampened and the pressure difference between the lower part 35 of the cavity 9 and the upper part 33 of the cavity 9 prevents reopening events of the needle 11.
  • the width b of the gap 37 is optimised considering the maximum frequency of operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20161453.4A 2020-03-06 2020-03-06 Ventilanordnung für ein einspritzventil sowie einspritzventil Pending EP3875747A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20161453.4A EP3875747A1 (de) 2020-03-06 2020-03-06 Ventilanordnung für ein einspritzventil sowie einspritzventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20161453.4A EP3875747A1 (de) 2020-03-06 2020-03-06 Ventilanordnung für ein einspritzventil sowie einspritzventil

Publications (1)

Publication Number Publication Date
EP3875747A1 true EP3875747A1 (de) 2021-09-08

Family

ID=69780007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20161453.4A Pending EP3875747A1 (de) 2020-03-06 2020-03-06 Ventilanordnung für ein einspritzventil sowie einspritzventil

Country Status (1)

Country Link
EP (1) EP3875747A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1122585A (ja) * 1997-07-02 1999-01-26 Honda Motor Co Ltd 噴射弁
US20060201478A1 (en) * 2005-03-09 2006-09-14 Vachon John T Internal combustion engine
EP3339628A1 (de) * 2016-12-23 2018-06-27 Continental Automotive GmbH Ventilanordnung für ein einspritzventil und einspritzventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1122585A (ja) * 1997-07-02 1999-01-26 Honda Motor Co Ltd 噴射弁
US20060201478A1 (en) * 2005-03-09 2006-09-14 Vachon John T Internal combustion engine
EP3339628A1 (de) * 2016-12-23 2018-06-27 Continental Automotive GmbH Ventilanordnung für ein einspritzventil und einspritzventil

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Owner name: VITESCO TECHNOLOGIES GMBH