EP3365551A1 - Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission - Google Patents

Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission

Info

Publication number
EP3365551A1
EP3365551A1 EP16763548.1A EP16763548A EP3365551A1 EP 3365551 A1 EP3365551 A1 EP 3365551A1 EP 16763548 A EP16763548 A EP 16763548A EP 3365551 A1 EP3365551 A1 EP 3365551A1
Authority
EP
European Patent Office
Prior art keywords
magnetic core
inlet valve
armature
housing body
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.)
Granted
Application number
EP16763548.1A
Other languages
German (de)
English (en)
Other versions
EP3365551B1 (fr
Inventor
Stefan Kolb
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 EP3365551A1 publication Critical patent/EP3365551A1/fr
Application granted granted Critical
Publication of EP3365551B1 publication Critical patent/EP3365551B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • F02M59/368—Pump inlet valves being closed when actuated
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear

Definitions

  • the invention relates to an electromagnetically operable inlet valve for a high pressure pump, in particular a fuel injection system, according to the preamble of claim 1. Furthermore, the invention relates to a high pressure pump with such an inlet valve.
  • An electromagnetically operable inlet valve for a high-pressure pump of a fuel injection system is known from DE 10 2013 220 593 A1.
  • the high-pressure pump has at least one pump element with one in one
  • the pump working space can be connected to an inlet for the fuel via the inlet valve.
  • the inlet valve comprises a valve member which cooperates with a valve seat for control and which is movable between an open position and a closed position. In its closed position, the valve member comes to rest against the valve seat.
  • the inlet valve comprises an electromagnetic actuator, through which the valve member is movable.
  • the electromagnetic actuator has a magnet armature acting at least indirectly on the valve member, a magnet coil surrounding the magnet armature and a magnet core.
  • the magnet armature is displaceably guided in a carrier element, wherein the carrier element and the magnetic core are connected to one another.
  • the armature When the solenoid is energized, the armature is movable against the force of a return spring and comes at least indirectly on the magnetic core to the plant. Between the armature and the magnetic core, a spacer made of non-magnetic material may be arranged to ensure a residual air gap and to magnetically bond the armature to the magnetic core avoid. When hitting the armature on the magnetic core, it can lead to high loads of these two components and the connection between the support member and the magnetic core, which can lead to damage of these components over a longer period of operation, whereby the functioning of the intake valve can be impaired.
  • the inlet valve according to the invention with the features of claim 1 has the advantage that can be relieved by the support of the magnetic core in the housing body via an intermediate layer, a load on the connection between the support member and the magnetic core when striking the armature. In addition, by the intermediate layer, the load of the armature and the magnetic core when striking the armature can be reduced.
  • FIG. 1 shows a schematic longitudinal section through a high-pressure pump
  • Figure 2 shows an enlarged view of a designated II in Figure 1 section with the inlet valve of the high pressure pump
  • Figure 4 shows the detail III according to a second embodiment.
  • a high pressure pump is shown in fragmentary form, which is provided for fuel delivery in a fuel injection system of an internal combustion engine.
  • the high-pressure pump has at least one pump element 10, which in turn has a pump piston 12, which is driven by a drive in a lifting movement, in a cylinder bore 14 of a housing part
  • a drive shaft 20 may be provided with a cam 22 or eccentric on which the pump piston 12 is supported directly or via a plunger, for example a roller tappet.
  • the pump working chamber 18 can be connected to a fuel inlet 26 via an inlet valve 24 and via an outlet valve 28 to a reservoir 30.
  • the pump working chamber 18 can be filled with fuel when the inlet valve 24 is open.
  • this fuel displaces the pump working chamber 18 and conveys it into the reservoir 30.
  • the inlet valve 24 has a piston-shaped valve member 34 which has a shaft 36 displaceably guided in the through-bore 32 and a head 38 which is larger in diameter than the shaft 36 and which is arranged in the pump working space 18.
  • a valve seat 40 is formed on the housing part 16, with which the valve member 34 cooperates with a formed on its head 38 sealing surface 42.
  • the through hole 32 has a larger diameter than in the shaft 36 of the valve member 34 leading portion, so that the shaft 36 of the valve member
  • annular space 44 In the annular space 44 open one or a plurality of inlet bores 46, on the other hand open on the outside of the housing part 16.
  • valve member 34 protrudes on the pump working chamber 18 side facing away from the housing part 16 out of the through hole 32 and on this a support member 48 is attached.
  • a valve spring 50 is supported on the support element 48, which on the other hand is supported on a region 52 of the housing part 16 surrounding the shaft 36 of the valve member 34.
  • the valve spring 50 is formed for example as a helical compression spring.
  • the inlet valve 24 can be actuated by an electromagnetic actuator 60, which is shown in particular in FIG.
  • the actuator 60 is controlled by an electronic control device 62 as a function of operating parameters of the internal combustion engine to be supplied.
  • the electromagnetic actuator 60 has a magnetic coil 64, a magnetic core 66 and a magnet armature 68.
  • the electromagnetic actuator 60 is arranged on the pump working chamber 18 side facing away from the inlet valve 24.
  • the magnetic core 66 and the magnetic coil 64 are arranged in a housing body 70 which can be fastened to the housing part 16 of the high-pressure pump.
  • the housing body 70 can be fastened to the housing part 16, for example, by means of a screw ring 72 which overlaps it and which is screwed onto a collar 74 of the housing part 16 provided with an external thread.
  • the armature 68 is at least substantially cylindrical in shape and slidably guided over its outer jacket in a bore 76 in a carrier element 78 arranged in the housing body 70.
  • the bore 76 in the support member 78 extends at least approximately coaxially to the through hole 32 in the housing part 16 and thus to the valve member 34.
  • the support member 78 has in its the housing part 16 opposite end portion 79 has a cylindrical outer shape.
  • the magnetic core 66 is arranged in the housing body 70 on the side facing away from the housing part 16 of the support member 78 and has a cylindrical outer shape.
  • the armature 68 has an at least approximately coaxial with the longitudinal axis 69 of the magnet armature 68 disposed central bore 80 into which a on the valve member 34 remote from the armature 68 disposed return spring 82 projects, which is supported on the armature 68.
  • the return spring 82 is supported at its other end at least indirectly on the magnetic core 66 having a central bore 84 into which the return spring 82 protrudes.
  • a support member 85 may be inserted for the return spring 82, for example, be pressed.
  • an intermediate element 86 is inserted, which may be formed as an anchor bolt.
  • the anchor bolt 86 is preferably pressed into the bore 80 of the magnet armature 68.
  • the return spring 80 may also be supported in the bore 80 on the anchor bolt 86.
  • the magnet armature 68 may have one or more passage openings 67.
  • an annular shoulder 88 is formed by a reduction in diameter between the armature 68 and the inlet valve 24, by which the movement of the armature 68 is limited to the inlet valve 24 out. If the housing body 70 is not yet fastened to the housing part 16 of the high-pressure pump, then the magnet armature 68 is secured against falling out of the bore 76 by the annular shoulder 88. Between the annular shoulder 88 and the magnet armature 68, a disc 89 may be arranged.
  • the carrier element 78 and the magnetic core 66 are connected to one another by means of a sleeve-shaped connecting element 90.
  • the connecting element 90 is in this case with its one axial end region 90a on the cylindrical portion
  • the connecting element 90 is, for example, bonded to the carrier element 78 and the magnetic core 66 in a material-bonded manner, in particular welded. In one between the axial end portions
  • the connecting element 90 is connected neither to the carrier element 78 nor to the magnetic core 66 and bridges an axial distance between the carrier element 78 and magnetic core 66.
  • the housing body 70 is preferably made of plastic, for example in an injection molding process.
  • the magnet coil 64 and optionally further parts of the electromagnetic actuator 60 are encapsulated by the plastic material of the housing body 70.
  • the magnetic core 66 together with the carrier element 78 forms a preassembled module, which is used after the production of the housing body 70 in this.
  • the magnetic core 66 in this case enters into a surrounding recess 94 in the housing body 70 on its circumference.
  • the recess 94 is limited on its side facing away from the carrier element 78 by a wall 95 of the housing body 70.
  • the magnetic core 66 is supported on the housing body 70, in particular on its wall 95, at least on its side facing away from the magnet armature 68 via an intermediate layer 96.
  • the intermediate layer 96 is applied to the housing body 70 and / or on the magnetic core 66 prior to the introduction of the magnetic core 66 and partially displaced into the housing body 70 when the magnetic core 66 is introduced.
  • the intermediate layer 96 consists of an adhesive which is plastically deformable during the introduction of the magnetic core 66 into the housing body 70.
  • the adhesive is partially displaced by the magnetic core 66, so that it is ensured that a gap present between the end face of the magnetic core 66 and the wall 95 is completely filled with adhesive.
  • Housing body 70 cures the adhesive, so that the magnetic core 66 is supported on the wall 95 of the housing body 70 via the intermediate layer 96 of adhesive.
  • the intermediate layer 96 consists of a plastically and / or elastically deformable material such as an insulating material or foam.
  • the load of the connection by means of the connecting element 92 between the support member 78 and the magnetic core 66 when striking the magnet armature 68 at least indirectly on the magnetic core 66th decreases because some of the forces occurring from the magnetic core 66 via the intermediate layer 96 of
  • Housing body 70 is received. If the intermediate layer 96 consists of elastically deformable material, the stop of the magnet armature 68 can be damped at least indirectly on the magnet core 66 by this, as a result of which the load on the magnet armature 68, magnet core 66, carrier element 78 and connecting element 92 is reduced.
  • the inlet valve 24 is opened by the valve member 34 is in its open position, in which this is arranged with its sealing surface 42 away from the valve seat 40.
  • the movement of the valve member 34 in its open position is effected by the prevailing between the fuel inlet 26 and the pump working chamber 18 pressure difference against the force of the valve spring 50.
  • the magnetic coil 64 of the actuator 60 may be energized or de-energized. When the solenoid 64 is energized, the armature 68 is pulled by the resulting magnetic field against the force of the return spring 80 to the magnetic core 66 out.
  • the armature 68 When the solenoid 64 is deenergized, the armature 68 is urged toward the inlet valve 24 by the force of the return spring 82. The magnet armature 68 abuts on the end face of the shaft 36 of the valve member 34 via the anchor bolt 86.
  • valve member 34 of the inlet valve 24 is in its open position or closed position.
  • the magnet coil 64 is de-energized, the magnet armature 68 is pressed by the return spring 82 in the direction of adjustment according to the arrow B in FIG. 2, whereby the valve member 34 is pushed by the armature 68 against the armature 68
  • Valve spring 50 is pressed in the direction of adjustment B in its open position.
  • the force of the force acting on the armature 68 return spring 82 is greater than the force of the valve member 34 acting on the valve spring 50.
  • the armature 68 acts on the valve member 34 and the armature 68 and the valve member 34 are together in the direction of adjustment B emotional.
  • the solenoid coil 64 is not energized can thus be promoted by the pump piston 12 no fuel in the memory 30 but displaced by the pump piston 12 fuel is fed back into the fuel inlet 26.
  • the magnetic coil 64 is energized, so that the magnet armature 68 is pulled toward the magnetic core 66 in a direction opposite to the direction of adjustment B as indicated by arrow A in FIG.
  • the armature 68 thus no longer exerts force on the valve member 34, wherein the magnet armature 68 is moved by the magnetic field in the direction A and the valve member 34 independent of the armature 68 due to the valve spring 50 and between the pump working chamber 18 and the fuel inlet 26 prevailing pressure difference in the direction of adjustment A is moved to its closed position.
  • the delivery rate of the high-pressure pump can be set variably in the memory 30.
  • the intake valve 34 is kept open by the actuator 60 during a large part of the delivery stroke of the pump piston 12, and if a large fuel delivery amount is required, the intake valve 34 becomes only for a small part or not at all during the delivery stroke the pump piston 12 is kept open.

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)

Abstract

L'invention concerne une soupape d'admission (24) à commande électromagnétique destinée à une pompe haute pression, en particulier d'un système d'injection de carburant. La soupape d'admission (24) présente un élément soupape (34) mobile entre une position d'ouverture et une position de fermeture. Un actionneur électromagnétique (60) permet le déplacement de l'élément soupape (34), l'actionneur électromagnétique (60) présentant une armature magnétique (68) agissant au moins indirectement sur l'élément soupape (34), une bobine magnétique (64) entourant l'armature magnétique (68), et un noyau magnétique (66) sur lequel l'armature magnétique (68) vient au moins indirectement en appui lorsque la bobine magnétique (64) est alimentée, l'armature magnétique (68) étant guidée mobile dans un élément de support (78) et l'élément de support (78) et le noyau magnétique (66) étant reliés l'un à l'autre. Le noyau magnétique (66) est au moins partiellement entouré par un corps de boîtier (70) et le noyau magnétique (66) est en appui dans le corps de boîtier (70) par une couche intermédiaire (96), au moins sur sa face opposée à l'armature magnétique (68).
EP16763548.1A 2015-10-22 2016-09-13 Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission Active EP3365551B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015220677.7A DE102015220677A1 (de) 2015-10-22 2015-10-22 Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil
PCT/EP2016/071571 WO2017067715A1 (fr) 2015-10-22 2016-09-13 Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission

Publications (2)

Publication Number Publication Date
EP3365551A1 true EP3365551A1 (fr) 2018-08-29
EP3365551B1 EP3365551B1 (fr) 2019-08-28

Family

ID=56896575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16763548.1A Active EP3365551B1 (fr) 2015-10-22 2016-09-13 Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission

Country Status (3)

Country Link
EP (1) EP3365551B1 (fr)
DE (1) DE102015220677A1 (fr)
WO (1) WO2017067715A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018218379A1 (de) * 2018-10-26 2020-04-30 Robert Bosch Gmbh Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1064679A (en) * 1962-12-03 1967-04-05 Ass Eng Ltd Fuel injectors for internal combustion engines
EP1486665A4 (fr) * 2002-03-15 2010-09-01 Bosch Automotive Systems Corp Injecteur de combustible
DE102013220593A1 (de) 2013-10-11 2015-04-16 Robert Bosch Gmbh Elektromagnetisch ansteuerbares Saugventil

Also Published As

Publication number Publication date
WO2017067715A1 (fr) 2017-04-27
DE102015220677A1 (de) 2017-04-27
EP3365551B1 (fr) 2019-08-28

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