EP3014109B1 - Module magnétique pour un injecteur de carburant - Google Patents

Module magnétique pour un injecteur de carburant Download PDF

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Publication number
EP3014109B1
EP3014109B1 EP14733135.9A EP14733135A EP3014109B1 EP 3014109 B1 EP3014109 B1 EP 3014109B1 EP 14733135 A EP14733135 A EP 14733135A EP 3014109 B1 EP3014109 B1 EP 3014109B1
Authority
EP
European Patent Office
Prior art keywords
air gap
residual air
magnet assembly
fixing element
magnet
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.)
Active
Application number
EP14733135.9A
Other languages
German (de)
English (en)
Other versions
EP3014109A1 (fr
Inventor
Christian Faltin
Klemens Steinberg
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 EP3014109A1 publication Critical patent/EP3014109A1/fr
Application granted granted Critical
Publication of EP3014109B1 publication Critical patent/EP3014109B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • 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
    • 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
    • F02M2200/07—Fuel-injection apparatus having means for avoiding sticking of valve or armature, e.g. preventing hydraulic or magnetic sticking of parts

Definitions

  • a fuel injector for motor vehicles may have a solenoid valve for controlling a fuel pressure in the fuel injector or in a control chamber of an injection valve.
  • the solenoid valve has an electromagnet and a movable armature. A valve member, which is acted upon by a valve closing spring in the closing direction, is moved with the armature. The valve member cooperates with a valve seat of the solenoid valve and thus controls the fuel drain from the control chamber.
  • the electromagnet has a magnetic coil and a magnetic core.
  • the anchor has an anchor plate and an anchor bolt.
  • a residual air gap disc (RLSS) may be provided which defines a residual air gap between these elements.
  • the residual air gap disk is arranged floating between the armature and the electromagnet and can be centered over its outer circumference.
  • the armature stroke that is to say the tightening and releasing of the armature, in connection with displacement and filling of the gap between armature and magnetic core with medium, results in a more or less pronounced or changing hydraulic adhesion or adhesion of the residual air gap disc Anchor or on the magnetic core.
  • different closing conditions and thus also different closing durations of the armature in injector operation can arise.
  • EP 2 254 130 A2 is a Restluftspaltopathy known which has projections and is fixed on these projections in position.
  • such a design of the residual air gap disc limits the choice of material of the residual air gap disc.
  • wear of the projections can reduce the life of the residual air gap disk.
  • the residual air gap disc is axially fixed by a fixing.
  • a magnet assembly for a fuel injector includes an armature for moving a valve member and an electromagnet having a magnetic core and a solenoid. Further, the magnet assembly has a residual air gap disk for adjusting a distance between the magnetic core and the armature. The residual air gap disk is arranged between the electromagnet and the armature. In this case, the residual air gap disk is fixed in a direction parallel to a longitudinal axis of the magnet assembly by a fixing element.
  • the fixing element is designed separately from the residual air gap disk.
  • the fixing element is designed as a parallel to the longitudinal axis of the magnet assembly biased spring element.
  • a spring element can be an elastically or else partially plastic restoring element which can deform under load and return to the original shape after relief.
  • the idea of the present invention is based on fixing the residual air gap disk in the axial direction with respect to the magnetic core by means of an additional, separately executed fixing element. Thanks to this inventive design of the magnet assembly with a fixing substantially no relative movement between the electromagnet and the residual air gap disc takes place.
  • the fixing element is arranged between the residual air gap disk and the anchor plate and contributes to the adhesion between the armature or the anchor plate and the residual air gap disk being prevented or stably being pronounced in its strength.
  • the fixing can serve to secure the residual air gap disc in a magnet sleeve of the electromagnet during assembly of the magnet assembly.
  • the materials of the residual air gap disk and the fixing element can be chosen freely and independently of each other thanks to the separate configuration.
  • the Versch redesign the residual air gap disk and also the wear of the fixing can be minimized.
  • the axial bending deformation of the residual air gap disk is reduced by the armature movement, thereby reducing the wear of the residual air gap disk.
  • the fixing element and the residual air gap disc prevent wear of elements that would touch each other in a configuration without fixing element and residual air gap disc.
  • the closing duration of the valve member which is monitored and corrected by a control unit, can undesirably occur in known magnet assemblies also take into account the variations in the closing time caused by the hydraulic bonding of the residual air gap.
  • such "temporary" corrections can be avoided by the control unit. In this case, the control unit only corrects wear-related closing duration drifts.
  • the magnet assembly or the fuel injector can be used in a motor vehicle with an internal combustion engine, for example with a diesel engine.
  • the magnet assembly together with the valve member may also be referred to as a solenoid valve and used to control a fuel pressure in a control chamber of an injector, for example in a common rail high pressure accumulator injection system.
  • the magnetic core of the electromagnet may surround the magnetic coil.
  • the magnetic core may have a radially outer pole, also referred to as Magnetkernau hybridpol, and a radially inner inner pole, also referred to as Magnetkerninnenpol.
  • the anchor may have an anchor plate and an anchor bolt.
  • the distance between a surface of the electromagnet and a surface of the anchor plate facing the electromagnet may be referred to as a residual air gap.
  • the residual air gap disk is arranged.
  • the residual air gap disk can define the minimum distance between the armature plate and the electromagnet.
  • the residual air gap disc can dampen the armature movement.
  • the residual air gap disc can be circular or annular.
  • the residual air gap disk comprises or consists of a ferromagnetic or a non-magnetic material.
  • the fixing element fixes the residual air gap disc in a direction parallel to a longitudinal axis, that is, in the axial direction of the magnet assembly or the Fuel injector.
  • the axial direction corresponds to the direction of movement of the valve piston of the fuel injector.
  • the fixing element may preferably comprise or consist of a non-magnetic material.
  • the fixing element may have the same material as the residual air gap disk.
  • the fixing element has a different material than the residual air gap disk.
  • the fixing element may be designed as a spring, which is biased in the axial direction.
  • the fixing element fixes the residual air gap disk such that a rotationally symmetrical introduction of force into the residual air gap disk takes place with respect to the longitudinal axis. That is, the residual air gap disk and the fixing element are each rotationally symmetrical.
  • the fixing element fixes the residual air gap disc in a direction perpendicular to the longitudinal axis of the magnet assembly. This means that the residual air gap disc is fixed in both the axial and in the radial direction with respect to the electromagnet.
  • the residual air gap disk can be centered over its circumference and then pressed against the electromagnet by the fixing element.
  • the fixing element is designed as a spiral spring or as a wave spring.
  • the spring element may be designed as a helical spring or as a torsion spring.
  • the fixing element can be designed, for example, similar to a multi-layered disc spring. The loading or pretensioning of the fixing element runs along the spring axis, which coincides with the longitudinal axis of the magnet assembly.
  • the fixing element is designed as a clamping sleeve.
  • a clamping sleeve may be a solid material element, which is pressed or clamped between the residual air gap disc and the anchor plate, for example by pressing mass and / or welded to the magnet sleeve.
  • the clamping sleeve can be made inelastic.
  • the fixing element is clamped between the residual air gap disc and the armature, pressed and / or welded.
  • clamping or pressing in the fixing element can enter into a frictional connection with other elements such as the magnet sleeve or with the anchor plate.
  • the fixing element may be arranged between the anchor plate and the residual air gap disc such that it is fixed in a self-locking manner.
  • the fixing element can be welded to the magnetic sleeve, for example. For this purpose laser shearing can be used.
  • the electromagnet is arranged in a magnet sleeve.
  • the magnet sleeve has a clamping element, which is designed to press the fixing element in a direction parallel to the longitudinal axis of the magnet assembly against the residual air gap disc;
  • the magnet sleeve has a receiving element which is designed to receive an end region of the fixing element and to prevent it from slipping in a direction perpendicular to the longitudinal axis of the magnet assembly.
  • the clamping element may for example be designed as an inclined plane or as a slope.
  • the inclined plane runs in a plane that includes an angle smaller than 90 ° with the surface of the magnetic core.
  • the clamping element can be designed as a projection or as an annular groove in the magnet sleeve.
  • the magnetic sleeve has a receiving element, which is designed, for example, as a recess or indentation on the inner circumference of the magnetic sleeve.
  • the electromagnet has an inner pole and an outer pole.
  • the residual air gap disk is arranged and fixed in the region of the outer pole.
  • the residual air gap disk can be referred to as the outer residual air gap disk (aRLSS).
  • the inner pole is the pole closest to the longitudinal axis of the magnet assembly.
  • the outer pole is the pole further away from the longitudinal axis.
  • FIG. 2 excluded, are merely schematic representations of inventive devices or their components according to embodiments of the invention. In particular, distances and size relationships are not shown to scale in the figures. In the various figures, corresponding elements are provided with the same reference numbers.
  • Fig. 1 a cross section through a magnet assembly 3 is shown.
  • the magnet assembly 3 forms part of a fuel injector 1.
  • the magnet assembly 3 can be embodied as a solenoid valve for controlling a fuel pressure in the fuel injector 1 or in a control chamber of an injection valve. By means of the fuel pressure in the control chamber, a lifting movement of a valve piston is controlled, with which an injection opening of the injection valve can be opened or closed.
  • the magnet assembly 3 has an electromagnet 5 and a movable armature 17.
  • the electromagnet 5 is arranged in a magnet sleeve 15 and has a magnetic coil 9 and a magnetic core 7.
  • the armature 17 has an anchor plate 19 and an anchor bolt 21. Between the armature plate 19 and the magnetic core 7, a residual air gap disk 25 is provided, which defines a residual air gap 27 between the electromagnet 5 and the armature 17 and contributes to the damping of the armature movement.
  • the electromagnet 5 has a magnetic core inner pole 11 and a magnetic core outer pole 13. The magnetic core inner pole 11 is arranged closer to a longitudinal axis 35 than the Magnetkernau touchpol 13.
  • the residual air gap disk 25 is disposed in the region of Magnetkernau touchpols 13 and can therefore be referred to as external residual air gap disk 25.
  • the residual air gap disk is freely floating between armature and electromagnet and can adhere alternately to the armature and the magnetic core by so-called hydraulic bonding. This can lead to different closing states and thus also to different closing durations of the armature. This can cause variations in the Injection amount of the fuel injector caused. If the residual air gap disc is executed with projections and fastened by these in order to avoid hydraulic sticking, this limits the choice of material of the residual air gap disc. Further, wear of the projections reduces the life of the residual air gap disc.
  • an additional separately executed fixing element 29 made of non-magnetic material is provided between the residual air gap disk 25 and the anchor plate 19 or a dial 23 connected to the magnet sleeve 15.
  • the fixing element 29 fixes the residual air gap disk 25 in the axial direction, that is to say in a direction parallel to the longitudinal axis 35 of the magnet assembly 3. This produces a stable or constant state between the armature 17 and the residual air gap disk 25. In other words, mixing states of the residual air gap disk 25 between hydraulic bonding and detachment thanks to the fixing element 29 are avoided.
  • the residual air gap disk 25 is radially centered by the fixing element 29.
  • the fixing member 29 is designed and arranged on the magnet assembly 3, that a flow of a control and return amount in the direction of return 33 (in Fig. 1 up) is guaranteed. That is, the control or return amount can proceed as in previous magnet assemblies in the center of the magnetic core 7 along the valve spring 31 and also between the magnet sleeve 15 and the outer periphery of the magnetic core 7, without being hindered by the fixing member 29.
  • Fig. 3 to 5 are cutouts of the magnet assembly 3 shown. Show Fig. 3 to 5 different embodiments of the fixing element 29. In the Fig.
  • the fixing element 29 is executed in a non-inventive embodiment as a spring ring with different cross-sections.
  • the magnet sleeve 15 in the Fig. 2A to 2D different geometric clamping features or clamping elements 37 for pressing the fixing element 29 against the residual air gap slide 25.
  • the fixing element 29 is executed in a non-inventive embodiment as a spring ring with an oval cross-section.
  • a clamping element 37 designed as an annular groove is provided in the magnet sleeve 15.
  • the spring ring is arranged in the annular groove, that it presses the residual air gap disk 25 in the axial direction against the Magnetkernau touchpol 13.
  • FIG. 2B is the fixing member 29 in a non-inventive embodiment similar to the embodiment in Fig. 2A executed.
  • Fig. 2A has the spring washer in Fig. 2B a round or circular cross section parallel to the longitudinal axis 35.
  • the spring ring is like in Fig. 2A self-locking positioned on the annular groove.
  • the fixing element 29 is also executed in a non-inventive embodiment as a spring ring with a circular cross-section.
  • the clamping element 37 in Fig. 2C designed as an inclined plane which forms an angle ⁇ 90 ° with the surface of the magnetic core 7 and in this way presses the spring ring against the residual air gap disk 25.
  • Fig. 2D shows one too Fig. 2C similar not inventive design of the clamping feature 37 as an inclined plane.
  • the fixing element 29 in Fig. 2D designed as a spring ring with a trapezoidal cross-section.
  • Fig. 3 the configuration of the fixing element 29 is shown as a clamping sleeve.
  • the clamping sleeve can be made of solid material and executed inelastic in contrast to the spring elements described above.
  • the clamping sleeve is in Fig. 3A pressed in and in Fig. 3B welded to the magnet sleeve 15.
  • a geometrical clamping feature 37 on the magnet sleeve 15 can be dispensed with.
  • Fig. 4 an embodiment of the fixing element 29 is shown as a spiral spring.
  • the spiral spring can extend in a plane perpendicular to the longitudinal axis 35 of the magnet assembly 3 in a ring-shaped or segment-like manner around the armature 17.
  • the coil spring is biased in the axial direction and can be supported for example on the dial 23 or on the magnet sleeve 15.
  • FIG. 5 different configurations are shown with different cross sections of the fixing element 29 as a spring element.
  • the fixing element is designed as a cross-sectionally S-shaped spring element.
  • the fixing element 29 is wave-shaped in FIG a cross-section parallel to the longitudinal axis 35 executed.
  • the fixing element 29 is designed as in a cross-section parallel to the longitudinal axis 35 elongated bent spring element, which is similar to the embodiment in Fig. 5A is executed.

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)

Claims (8)

  1. Sous-ensemble magnétique (3) pour un injecteur de carburant (1), le sous-ensemble magnétique (3) possédant
    un électroaimant (5) muni d'un noyau magnétique (7) et une bobine magnétique (9) ;
    un induit (17) qui peut être déplacé dans la direction d'un axe longitudinal (35) au moyen de l'électroaimant (5) ;
    une plaquette à entrefer résiduel (25) destinée à régler l'écart entre le noyau magnétique (7) et l'induit (17) ;
    la plaquette à entrefer résiduel (25) étant disposée entre le noyau magnétique (7) et l'induit (17) ;
    la plaquette à entrefer résiduel (25) étant immobilisée par un élément d'immobilisation (29) dans une direction parallèle à l'axe longitudinal (35) du sous-ensemble magnétique (3) et l'élément d'immobilisation (29) étant réalisé séparément de la plaquette à entrefer résiduel (25) ;
    caractérisé en ce que
    l'élément d'immobilisation (29) est réalisé sous la forme d'un élément à ressort précontraint parallèlement à l'axe longitudinal (35) du sous-ensemble magnétique (3).
  2. Sous-ensemble magnétique (3) selon la revendication 1, l'élément d'immobilisation (29) immobilisant la plaquette à entrefer résiduel (25) de telle sorte qu'une induction de force à symétrie rotationnelle par rapport à l'axe longitudinal (35) a lieu dans la plaquette à entrefer résiduel (25).
  3. Sous-ensemble magnétique (3) selon la revendication 1 ou 2, l'élément d'immobilisation (29) immobilisant la plaquette à entrefer résiduel (25) dans une direction perpendiculaire à l'axe longitudinal (35) du sous-ensemble magnétique (3).
  4. Sous-ensemble magnétique (3) selon la revendication 1, l'élément d'immobilisation (29) étant réalisé sous la forme d'un ressort en spirale ou d'un ressort sinueux.
  5. Sous-ensemble magnétique (3) selon l'une des revendications 1 à 3, l'élément d'immobilisation (29) étant réalisé sous la forme d'une douille de serrage.
  6. Sous-ensemble magnétique (3) selon l'une des revendications 1 à 5, l'élément d'immobilisation (29) étant coincé, enfoncé et/ou soudé entre la plaquette à entrefer résiduel (25) et l'induit (17).
  7. Sous-ensemble magnétique (3) selon l'une des revendications 1 à 6, l'électroaimant (5) étant disposé dans une douille magnétique (15) ;
    la douille magnétique (15) possédant un élément de serrage (37) qui est conçu pour pousser l'élément d'immobilisation (29) contre la plaquette à entrefer résiduel (25) dans une direction parallèle à l'axe longitudinal (35) du sous-ensemble magnétique (3) ; et/ou
    la douille magnétique (15) possédant un élément d'accueil qui est conçu pour accueillir une zone d'extrémité de l'élément d'immobilisation (29) et le bloquer pour empêcher un glissement dans une direction perpendiculaire à l'axe longitudinal (35) du sous-ensemble magnétique (3).
  8. Sous-ensemble magnétique (3) selon l'une des revendications 1 à 7, l'électroaimant (5) possédant un pôle intérieur (11) et un pôle extérieur (13) ;
    la plaquette à entrefer résiduel (25) étant immobilisée dans la zone du pôle extérieur (23).
EP14733135.9A 2013-06-27 2014-06-20 Module magnétique pour un injecteur de carburant Active EP3014109B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310212504 DE102013212504A1 (de) 2013-06-27 2013-06-27 Magnetbaugruppe für einen Kraftstoffinjektor
PCT/EP2014/063000 WO2014206872A1 (fr) 2013-06-27 2014-06-20 Module magnétique pour un injecteur de carburant

Publications (2)

Publication Number Publication Date
EP3014109A1 EP3014109A1 (fr) 2016-05-04
EP3014109B1 true EP3014109B1 (fr) 2017-04-26

Family

ID=51022311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14733135.9A Active EP3014109B1 (fr) 2013-06-27 2014-06-20 Module magnétique pour un injecteur de carburant

Country Status (3)

Country Link
EP (1) EP3014109B1 (fr)
DE (1) DE102013212504A1 (fr)
WO (1) WO2014206872A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105448456B (zh) * 2015-12-10 2017-10-03 哈尔滨工程大学 并联磁路多吸合面高速电磁铁
DE102016205128A1 (de) 2016-03-29 2017-10-05 Robert Bosch Gmbh Magnetventilanordnung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948874A1 (de) * 1979-12-05 1981-06-11 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil
GB2124430A (en) * 1982-07-29 1984-02-15 Lucas Ind Plc An electromgnetic fuel injector with a plate-type armature
US6655611B2 (en) * 2001-02-12 2003-12-02 Delphi Technologies, Inc. Electromagnetic fuel injector comprising flexible element for positioning armature
DE102009001706A1 (de) * 2009-03-20 2010-09-23 Robert Bosch Gmbh Restluftspaltscheibe
DE102009003213A1 (de) 2009-05-19 2010-11-25 Robert Bosch Gmbh Restluftspaltscheibe
DE102012206215A1 (de) * 2012-04-16 2013-10-17 Robert Bosch Gmbh Magnetbaugruppe, insbesondere für ein Magnetventil eines Kraftstoffinjektors

Also Published As

Publication number Publication date
DE102013212504A1 (de) 2014-12-31
EP3014109A1 (fr) 2016-05-04
WO2014206872A1 (fr) 2014-12-31

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