EP2698525A1 - Aiguille de soupape, ensemble soupape et soupape d'injection - Google Patents

Aiguille de soupape, ensemble soupape et soupape d'injection Download PDF

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Publication number
EP2698525A1
EP2698525A1 EP12180211.0A EP12180211A EP2698525A1 EP 2698525 A1 EP2698525 A1 EP 2698525A1 EP 12180211 A EP12180211 A EP 12180211A EP 2698525 A1 EP2698525 A1 EP 2698525A1
Authority
EP
European Patent Office
Prior art keywords
valve needle
valve
orifices
needle
fluid
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Withdrawn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
EP12180211.0A
Other languages
German (de)
English (en)
Inventor
Paolo Bertini
Matteo Soriani
Filippo Falaschi
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.)
Continental Automotive 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 EP12180211.0A priority Critical patent/EP2698525A1/fr
Publication of EP2698525A1 publication Critical patent/EP2698525A1/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Withdrawn legal-status Critical Current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
    • F02M51/0671—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
    • F02M51/0682—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 the body being hollow and its interior communicating with the fuel flow
    • 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
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/27—Fuel-injection apparatus with filters

Definitions

  • the invention relates to a valve needle, a valve assembly for an injection valve and an injection valve.
  • Injection valves are in widespread use, in particular for an internal combustion engine where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • Injection valves are manufactured in various forms in order to satisfy the various needs for the various combustion engines. Therefore, for example, their length, their diameter, and all the various elements of the injection valve being responsible for the way the fluid is dosed may vary in a wide range.
  • the respective injection valve may be suited to dose fluids under high pressures.
  • the pressures may be in the range of up to 200 bar for gasoline engines or in the range of more than 2000 bar for diesel engines.
  • It is an object of the invention is to specify a valve needle, a valve assembly and an injection valve which are simple to be manufactured and/or which facilitate a reliable and precise function.
  • a valve needle is specified.
  • the valve needle is in particular a valve needle for an injection valve.
  • the valve needle has an upper end and a tip opposite the upper end. Between the upper end and the tip, the valve needle comprises a barrel.
  • an inner recess is formed by means of the barrel, the inner recess extending from the upper end in direction toward the tip.
  • the valve needle comprises a plurality of orifices forming a sieve-like structure in the barrel of the valve needle.
  • the barrel has at least one zone where it is perforated by the orifices. In this way, fluid may enter the recess of the valve needle at the upper end and leave the valve needle to the outside through the orifices.
  • the expression "sieve-like structure” means in particular that the cross-sectional areas of the individual orifices are considerably smaller than the area-content of the perforated zone on an exterior surface of the barrel.
  • the cross-sectional area of each orifice has a value of 1/20 or less, preferably of 1/100 or less, for example of 1/500 or less of the area-content of the perforated zone on the exterior surface.
  • the perforated zone may comprise a large number of orifices.
  • the perforated zone has for example 50 orifices or more, preferably 150 orifices or more and in particular 300 orifices or more.
  • a plurality of the orifices are arranged subsequent to each other in an axial direction of the valve needle, i.e. in the direction from the upper end to the tip. For example 5 or more orifices, and in particular 50 or less orifices, are arranged in a row in the axial direction.
  • a valve assembly for an injection valve is specified.
  • the valve assembly is in particular a valve assembly of an injection valve.
  • the valve assembly comprises a valve body including a central longitudinal axis.
  • the valve body has a cavity, the cavity having a fluid inlet portion and a fluid outlet portion.
  • the valve assembly comprises a valve needle axially movable in the cavity.
  • the valve needle is in particular the valve needle according to the first aspect.
  • the valve needle prevents a fluid flow through the fluid outlet portion in a closing position and releases the fluid flow through the fluid outlet portion in further positions.
  • the valve needle has an upper end facing the fluid inlet portion and an inner recess extending from the upper end in direction to the fluid outlet portion and enabling a fluid flow inside the valve needle.
  • the valve needle comprises a plurality of orifices forming a sieve-like structure in a barrel of the valve needle and being designed to enable a fluid flow between the inner recess and the fluid outlet portion.
  • the orifices are forming the sieve-like structure the fluid may be filtered from particles before these particles may reach the fluid outlet portion.
  • a very homogeneous distribution of the fluid downstream the valve needle may be obtained.
  • pressure fluctuations of the fluid inside the valve body may be kept small. This can result in an excellent dynamic performance of the injection valve. Consequently, a long life-time of the valve assembly is possible.
  • the orifices are arranged evenly circumferentially in the barrel of the valve needle.
  • the number of orifices per unit area is constant throughout the perforated zone in this case.
  • the orifices are arranged at the grid points of a uniform imaginary grid on the exterior surface.
  • the orifices may be arranged in - preferably evenly spaced - columns and may be evenly spaced within the columns. The columns expediently extend in axial direction.
  • the uniform circumferential arrangement has the advantage that a circumferentially homogeneous distribution of the fluid downstream the valve needle may be obtained.
  • the orifices are arranged in at least two zones of the barrel of the valve needle.
  • the at least two zones are distanced from each other in axial direction.
  • the valve needle has two axially spaced perforated zones.
  • the orifices have a diameter in the range between 0.03 and 0.07 mm. This has the advantage that a very homogeneous fluid flow from the inner recess of the valve needle to the fluid outlet portion via the openings may be obtained. Furthermore, it may be prevented that particles of a given size may reach the fluid outlet portion.
  • the orifices are laser-drilled orifices. This has the advantage that the orifices may be produced in a simple manner. Consequently, a low cost solution for the orifices and the valve assembly may be obtained. Additionally, an exact size and exact positions of the orifices may be obtained. In particular, accurate and reproducible manufacturing is possible in this way.
  • an injection valve with an actuator unit and a valve assembly according to the preceding aspect is specified.
  • the actuator unit comprises an armature.
  • the armature is arranged in the cavity and is moveable relative to the valve needle and is designed to mechanically cooperate with the valve needle.
  • An injection valve 2 ( Figure 1 ) that is in particular suitable for dosing fuel to an internal combustion engine comprises a valve assembly 4 and an actuator unit 6.
  • the valve assembly 4 comprises a valve body 10 with a central longitudinal axis L and a cavity 11.
  • a valve needle 12 is arranged in the cavity 11.
  • the valve needle 12 can be moved in the cavity 11 in axial direction.
  • the valve needle 12 is essentially cylindrical and has a barrel 14.
  • the valve needle 12 is hollow with an inner recess 32.
  • the actuator unit 6 has an armature 16 which is arranged in the cavity 11. A recess is provided in the armature 16 which takes up a part of the valve needle 12. The armature 16 can move relative to the valve needle 12. In the cavity 11 an armature spring 18 is arranged and is coupled to the armature 16 to exert a force on the armature 16 in axial direction.
  • a recess 20 is provided in the valve body 10.
  • a main spring 22 is arranged in the recess 20.
  • the main spring 22 is mechanically coupled to the valve needle 12 to exert a force on the valve needle 12 in axial direction.
  • the valve needle 10 comprises a seat part 28 which has a spherical shape.
  • the seat part 28 closes the valve needle 10 at its lower end, i.e. at its tip.
  • the seat part 28 rests on a seat body 26 being part of the valve body 10.
  • a fluid flow through at least one injection nozzle 30 is prevented.
  • the injection nozzle 30 may be an injection hole for example.
  • a guide element 34 is arranged in the cavity 11.
  • the guide element 34 is coupled to the valve needle 12.
  • the guide element 34 is provided for guiding the valve needle 12 inside the valve body 10.
  • the guide element 34 and the armature 16 are forming an interlocking device so that the armature 16 entrains the guide element 34 for an axial movement of the valve needle 12.
  • the main spring 22 rests on a first spring seat being formed by the surface of the guide element 34 and a second spring seat being formed by a tube 36 which is provided in the recess 20.
  • the actuator unit 6 preferably comprises an electromagnetic actuator with a coil 38.
  • the coil 38, the armature 16 and parts of the valve body 10 are forming an electromagnetic circuit.
  • the valve assembly 4 has a fluid inlet portion 40 which is provided in the valve body 10. Furthermore, the valve assembly 4 has a fluid outlet portion 42 which is provided in the valve body 10 near the seat body 26. In particular the fluid outlet portion 42 comprises the seat body 26. The fluid inlet portion 40 and the fluid outlet portion 42 may be arranged at opposite ends of the valve assembly in a longitudinal direction. The fluid inlet portion 40 is in hydraulic communication with the fluid outlet portion 42.
  • the valve needle 12 has an upper end 44 facing the fluid inlet portion 40.
  • the inner recess 32 of the valve needle 12 extends from the upper end 44 in direction to the fluid outlet portion 42. It is in particular formed by the barrel 14.
  • Figures 2 and 3 show details of the valve needle 12 which has a plurality of orifices 46.
  • the orifices 46 are arranged circumferentially on the barrel 14 of the valve needle 12 in a uniform manner.
  • the orifices 46 form a sieve-like structure on the barrel 14 of the valve needle 12. Fluid may flow from the inner recess 32 inside the valve needle 12 through the orifices 46 in the barrel 14 to the fluid outlet portion 42.
  • the orifices 46 have a diameter in the range between 0.03 and 0.07 mm, in particular in the case that the valve needle 12 of the injection valve 2 has a typical diameter of about 2-2.5 mm.
  • the orifices 46 are laser-drilled.
  • the orifices 46 are arranged in two zones Z1, Z2 of the valve needle 12.
  • the two zones Z1, Z2 are distanced from each other in axial direction.
  • the fluid is led from the fluid inlet portion 40 to the inner recess 32 of the valve needle 12.
  • the main spring 22 forces the valve needle 12 in axial direction towards the seat body 26. It is depending on the force balance between the force on the valve needle 12 caused by the actuator unit 6 and the force on the valve needle 12 caused by the main spring 22 whether the valve needle 12 is in its closing position or not.
  • the main spring 22 can exert a force on the valve needle 12 in a manner that the valve needle 12 can move in axial direction in its closing position, and the seat part 28 is forced to sealingly rest on the seat body 26.
  • the armature spring 18 may dampen the movements of the armature 16 and the valve needle 12 in axial direction towards the seat body 26.
  • the actuator unit 6 may exert a force on the valve needle 12.
  • the force from the armature 16 on the valve needle 12 is contrary to the force on the valve needle 12 caused by the main spring 22.
  • the valve needle 12 is able to move in axial direction out of the closing position.
  • a homogenous fluid distribution downstream the outside of the barrel 14 of the valve needle 12 in an angular range of 360° may be obtained due to the orifices 46 being uniformly distributed over the circumference of the valve needle 12. Consequently, an appropriate shape of the spray of the injection valve 2 may be obtained.
  • fluid which flows through the valve assembly 4 may be filtered from particles by the sieve-like structure formed by the orifices 46.
  • the fluid may be filtered from particles which have been created inside the injection valve 2. Consequently, the fluid outlet portion 42 in particular between the seat part 28 and the seat body 26 may be kept free from particles.
  • valve assembly 4 and the injection valve 2 may be obtained.

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)
EP12180211.0A 2012-08-13 2012-08-13 Aiguille de soupape, ensemble soupape et soupape d'injection Withdrawn EP2698525A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12180211.0A EP2698525A1 (fr) 2012-08-13 2012-08-13 Aiguille de soupape, ensemble soupape et soupape d'injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12180211.0A EP2698525A1 (fr) 2012-08-13 2012-08-13 Aiguille de soupape, ensemble soupape et soupape d'injection

Publications (1)

Publication Number Publication Date
EP2698525A1 true EP2698525A1 (fr) 2014-02-19

Family

ID=46785233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12180211.0A Withdrawn EP2698525A1 (fr) 2012-08-13 2012-08-13 Aiguille de soupape, ensemble soupape et soupape d'injection

Country Status (1)

Country Link
EP (1) EP2698525A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106460747A (zh) * 2014-05-13 2017-02-22 德尔福国际业务卢森堡公司 燃料喷射器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004053762A1 (de) * 2004-11-08 2006-05-11 Robert Bosch Gmbh Ventilnadel für Fluidventil
DE102005037552A1 (de) * 2005-08-09 2007-02-15 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005061424A1 (de) * 2005-12-22 2007-07-05 Robert Bosch Gmbh Brennstoffeinspritzventil
EP2354528A1 (fr) * 2010-01-15 2011-08-10 Continental Automotive GmbH Ensemble de soupape et soupape d'injection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004053762A1 (de) * 2004-11-08 2006-05-11 Robert Bosch Gmbh Ventilnadel für Fluidventil
DE102005037552A1 (de) * 2005-08-09 2007-02-15 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005061424A1 (de) * 2005-12-22 2007-07-05 Robert Bosch Gmbh Brennstoffeinspritzventil
EP2354528A1 (fr) * 2010-01-15 2011-08-10 Continental Automotive GmbH Ensemble de soupape et soupape d'injection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106460747A (zh) * 2014-05-13 2017-02-22 德尔福国际业务卢森堡公司 燃料喷射器

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