WO2020083550A1 - 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 Download PDF

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Publication number
WO2020083550A1
WO2020083550A1 PCT/EP2019/073585 EP2019073585W WO2020083550A1 WO 2020083550 A1 WO2020083550 A1 WO 2020083550A1 EP 2019073585 W EP2019073585 W EP 2019073585W WO 2020083550 A1 WO2020083550 A1 WO 2020083550A1
Authority
WO
WIPO (PCT)
Prior art keywords
inlet valve
housing
pump
valve member
valve
Prior art date
Application number
PCT/EP2019/073585
Other languages
German (de)
English (en)
Inventor
Gabriel CICHON
Frank LAEMMLE
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 WO2020083550A1 publication Critical patent/WO2020083550A1/fr

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
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • 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
    • F02M2200/05—Fuel-injection apparatus having means for preventing corrosion
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8046—Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • the invention relates to an electromagnetically actuated 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 actuated inlet valve for a high-pressure pump of a fuel injection system is known from DE 10 2015 212 390 A1.
  • the high-pressure pump has at least one pump element with a pump piston which is driven in a lifting movement and delimits a pump working space.
  • the pump work space can be connected to an inlet for the fuel via the inlet valve.
  • the inlet valve comprises a valve member which interacts with a valve seat for control purposes and which is movable between an open position and a closed position. In its closed position, the valve member comes to rest on the valve seat.
  • the inlet valve comprises an electromagnetic actuator, through which the valve member can be moved.
  • the electromagnetic actuator has a magnet coil, a magnet core and a magnet armature which acts at least indirectly on the valve member.
  • the magnet armature is slidably guided in a receptacle in a carrier element.
  • the solenoid When the solenoid is energized, the magnet armature can be moved against the force of a return spring.
  • the carrier element and the magnetic core are connected to one another via a sleeve-shaped connecting element, wherein the connecting element can be welded to the carrier element and / or the magnetic core.
  • the magnetic core, the carrier element and the connecting element are surrounded by a housing. An interior space which is filled with air is present between the magnetic core, the carrier element and the connecting element on the one hand and the housing on the other hand.
  • the inlet valve according to the invention with the features of claim 1 has the advantage that the pressure compensation element prevents the formation of a negative pressure in the interior, so that the magnetic core and / or the carrier element are better protected against corrosion.
  • An advantageous embodiment of the pressure compensation element is specified in claim 2. Due to the design according to claim 3, the pressure compensation element does not have to be connected to the housing as a separate part. The design according to claim 4 enables easy handling of the pressure compensation element when it is connected to the housing as a separate element.
  • FIG. 1 shows a schematic longitudinal section through a high-pressure pump
  • FIG. 2 shows an enlarged view of an in FIG. 1 shows a section with the inlet valve of the high-pressure pump with a pressure compensation element
  • FIG. 3 shows the pressure compensation element in a further enlarged view.
  • FIG. 1 A section of a high-pressure pump is shown in FIG. 1, 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, is guided in a cylinder bore 14 of a housing part 16 of the high-pressure pump and delimits a pump work chamber 18 in the cylinder bore 14.
  • a drive shaft 20 with a cam 22 or eccentric can be provided as the drive for the pump piston 12, on which the pump piston 12 is supported directly or via a tappet, for example a roller tappet.
  • the pump work chamber 18 can be connected to a fuel inlet 26 via an inlet valve 24 and to a reservoir 30 via an outlet valve 28.
  • the pump work chamber 18 can be filled with fuel when the inlet valve 24 is open.
  • fuel is displaced from the pump working chamber 18 and is fed into the reservoir 30 when the inlet valve 24 is closed.
  • the cylinder bore 14 is adjoined on the side facing away from the pump piston 12 by a through bore 32 with a smaller diameter than the cylinder bore 14, which opens on the outside of the housing part 16.
  • the inlet valve 24 has a piston-shaped valve member 34 which has a shaft 36 which is 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 work chamber 18.
  • a valve seat 40 is formed on the housing part 16, with which the valve member 34 cooperates with a sealing surface 42 formed on its head 38.
  • the through bore 32 has a larger diameter than in the shaft 36 thereof Section leading valve member 34, so that an annular space 44 is formed surrounding the shaft 36 of the valve member 34.
  • One or more inlet bores 46 which on the other hand open on the outside of the housing part 16, open into the annular space 44.
  • valve member 34 protrudes out of the through hole 32 on the side of the housing part 16 facing away from the pump working space 18 and a support element 48 is fastened thereon.
  • a valve spring 50 is supported on the support element 48, which on the other hand is supported on a region of the housing part 16 surrounding the shaft 36 of the valve member 34. Through the valve spring 50, the valve member 34 is acted upon in an adjusting direction A in its closing direction, the valve member 34 resting in its closed position with its sealing surface 42 on the valve seat 40.
  • the valve spring 50 is designed, 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 FIGS. 2 and 3.
  • the actuator 60 is controlled by an electronic control device 62 as a function of the operating parameters of the internal combustion engine to be supplied.
  • the electromagnetic actuator 60 has a magnet coil 64, a magnet core 66 and a magnet armature 68.
  • the electromagnetic actuator 60 is arranged on the side of the inlet valve 24 facing away from the pump working space 18.
  • the magnetic core 66 and the magnetic coil 64 are surrounded by an actuator housing 70 which can be fastened to the housing part 16 of the high-pressure pump.
  • the actuator housing 70 is made of plastic and the magnetic coil 64 is accommodated in it.
  • the actuator housing 70 can be fastened, for example, to the housing part 16 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 magnet armature 68 is at least essentially cylindrical and is displaceably guided in the direction of its longitudinal axis 69 via its outer jacket in a receptacle in the form of a bore 76 in a carrier element 78.
  • the bore 76 in the carrier element 78 extends at least approximately coaxially to the through bore 32 in the housing part 16 of the high-pressure pump and thus to the valve member 34. let valve 24 out to another bore 77 with a smaller diameter than the bore 76.
  • the magnet armature 68 has a central blind bore 81, which is arranged at least approximately coaxially to the longitudinal axis 69 of the magnet armature 68 and into which a return spring 82, which is arranged on the side of the magnet armature 68 facing away from the valve member 34 and which is supported on the magnet armature 68, projects.
  • the return spring 82 is supported at its other end at least indirectly on the magnetic core 66, which has a central blind hole 84 into which the return spring 82 projects.
  • a support element 85 for the return spring 82 can be inserted, for example pressed in, in the bore 84 of the magnet armature 66.
  • the magnetic armature 68 has one or more through openings 91 to allow fuel to pass through when the magnetic armature 68 moves.
  • An annular shoulder 88 is formed in the bore 76 through the reduction in diameter to the further bore 77.
  • a stop element 90 can be arranged between the annular shoulder 88 and the magnet armature 68, by means of which the movement of the magnet armature 68 towards the inlet valve 24 is limited.
  • the stop element 90 is sleeve-shaped and through this the magnetic armature 68 projects through to the inlet valve 24 and comes to bear at least indirectly on the valve member 34.
  • the magnetic core 66 and the carrier element 78 are connected to one another via a sleeve-shaped connecting element 92, which on the magnetic core 66 and on the carrier element 78 by means of one each
  • An interior 94 is present between the carrier element 78, the magnetic core 66 and the connecting element 92 on the one hand and the actuator housing 70 surrounding them on the other.
  • the interior 94 extends in the radial direction with respect to the longitudinal axis 69 of the magnet armature 68 between the carrier element 78, the connecting element 92 and the magnetic core 66 on the one hand and the actuator housing 70 on the other hand.
  • the interior 94 extends along the carrier element 78, the connecting element 92 and the magnet core 66 to the end of the magnet core 66 facing away from the carrier element 78.
  • the interior 94 extends in the direction of the Longitudinal axis 68 between the magnetic core 66 and the actuator housing 70.
  • at least one pressure compensation element 96 is arranged on the actuator housing 70, by means of which the interior 94 is delimited.
  • the pressure compensation element 96 is arranged, for example, in a region of a wall of the actuator housing 70 lying in the direction of the longitudinal axis 69 of the magnet armature 68 next to the magnet core 66.
  • the pressure compensation element 96 has a membrane 98 which is permeable to air and steam, but is liquid-tight.
  • the membrane 98 can be designed, for example, as a flat disk with a round or any other cross-section.
  • the pressure compensation element 96 can have a frame 99 which receives the membrane 98 and which is inserted, for example glued in, tightly into an opening 71 in the actuator housing 70.
  • the pressure compensation element 96 can also be pressed into the opening 71 of the actuator housing 70, screwed in, caulked in this or directly encapsulated by the plastic material of the actuator housing 70.
  • the pressure compensation element 96 can also be connected to the housing 70 by a snap-in connection or a positive connection.
  • the membrane 98 of the pressure compensation element 96 enables pressure compensation and air exchange between the interior 94 and the surroundings, but prevents water, other liquids or dirt from entering the interior 94 from the surroundings.
  • the inlet valve 24 is opened in that the valve member 34 is in its open position, in which the sealing surface 42 is arranged away from the valve seat 40.
  • the movement of the valve member 34 into its open position is brought about by the pressure difference between the fuel inlet 26 and the pump working chamber 18 against the force of the valve spring 50.
  • the solenoid 64 of the actuator 60 can be energized or de-energized. When the magnet coil 64 is energized, the magnet armature 68 is pulled towards the magnet core 66 against the force of the return spring 82 by the resulting magnetic field.
  • the magnet armature 68 is pressed toward the inlet valve 24 by the force of the return spring 82.
  • the magnet armature 68 lies at least indirectly on the end face of the shaft 36 of the valve member 34.
  • the actuator 60 determines whether the valve member 34 of the inlet valve 24 is in its open position or closed position.
  • the solenoid 64 is not energized, the magnetic armature 68 is pressed by the return spring 82 in the actuating direction according to arrow B in FIG. 2, the valve member 34 being pressed by the magnet armature 68 against the valve spring 50 in the actuating direction B into its open position.
  • the force of the return spring 82 acting on the armature 68 is greater than the force of the valve spring 50 acting on the valve member 34.
  • the magnet armature 68 acts on the valve member 34 and the magnet armature 68 and the valve member 34 together in the setting direction B. emotional. As long as the magnet coil 64 is not energized, no fuel can thus be conveyed into the accumulator 30 by the pump piston 12, but fuel displaced by the pump piston 12 is conveyed back into the fuel inlet 26.
  • the magnet coil 64 is energized, so that the magnet armature 68 is pulled towards the magnet core 66 in an opposite direction to the direction of movement B according to arrow A in FIG. 2 becomes.
  • the armature 68 therefore no longer exerts any force on the valve member 34, the magnet armature 68 being moved in the actuating direction A by the magnetic field and the valve member 34 being independent of the magnet 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 setting direction A is moved into its closed position.
  • the delivery rate of the high-pressure pump into the accumulator 30 can be set variably. If a small amount of fuel delivery is required, the inlet valve 24 is kept open by the actuator 60 during a large part of the delivery stroke of the pump piston 12, and if a large amount of fuel delivery is required, the inlet valve 24 will be only during a small part or not at all of the delivery stroke of the pump piston 12 is kept open.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (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) comprend un élément de soupape (34) qui est déplaçable entre une position d'ouverture et une position de fermeture. Un actionneur électromagnétique (60) est prévu, au moyen duquel l'élément de soupape (34) peut être déplacé, l'actionneur électromagnétique (60) comprenant une bobine magnétique (64), un noyau magnétique (66) et un noyau plongeur (68) qui agit au moins indirectement sur l'élément de soupape (34), lequel noyau plongeur est guidé de manière coulissante, dans la direction de son axe longitudinal (69), dans un logement (76) d'un élément porteur (78). Le noyau magnétique (66), le noyau plongeur (68) et l'élément porteur (78) sont disposés dans un espace intérieur (94) d'un boîtier (70). L'espace intérieur (94) du boîtier (70) est relié à l'environnement par le biais d'un élément de compensation de pression (96) disposé sur le boîtier (70). Une compensation de pression et un échange d'air entre l'espace intérieur (94) et l'environnement sont rendus possibles par l'élément de compensation de pression (96). Ainsi, un apport d'humidité dans l'espace intérieur en cas de chauffage et de refroidissement des composants de la soupape d'admission peut être empêché.
PCT/EP2019/073585 2018-10-26 2019-09-04 Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission WO2020083550A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018218379.1A DE102018218379A1 (de) 2018-10-26 2018-10-26 Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil
DE102018218379.1 2018-10-26

Publications (1)

Publication Number Publication Date
WO2020083550A1 true WO2020083550A1 (fr) 2020-04-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/073585 WO2020083550A1 (fr) 2018-10-26 2019-09-04 Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission

Country Status (2)

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DE (1) DE102018218379A1 (fr)
WO (1) WO2020083550A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012224439A1 (de) * 2012-12-27 2014-07-03 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffeinspritzsystem, Verfahren zur Herstellung einer Hochdruckpumpe
WO2017001093A1 (fr) * 2015-07-02 2017-01-05 Robert Bosch Gmbh Soupape d'aspiration à actionnement électromagnétique pour une pompe haute pression et pompe haute pression
DE102015220677A1 (de) * 2015-10-22 2017-04-27 Robert Bosch Gmbh Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil
DE102016215304A1 (de) * 2016-08-17 2018-02-22 Robert Bosch Gmbh Elektromagnetisch betätigbares Saugventil und Kraftstoff-Hochdruckpumpe
DE102016220364A1 (de) * 2016-10-18 2018-04-19 Robert Bosch Gmbh Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil
DE102016224722A1 (de) * 2016-12-12 2018-06-14 Robert Bosch Gmbh Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012224439A1 (de) * 2012-12-27 2014-07-03 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffeinspritzsystem, Verfahren zur Herstellung einer Hochdruckpumpe
WO2017001093A1 (fr) * 2015-07-02 2017-01-05 Robert Bosch Gmbh Soupape d'aspiration à actionnement électromagnétique pour une pompe haute pression et pompe haute pression
DE102015212390A1 (de) 2015-07-02 2017-01-05 Robert Bosch Gmbh Elektromagnetisch betätigbares Saugventil für eine Hochdruckpumpe sowie Hochdruckpumpe
DE102015220677A1 (de) * 2015-10-22 2017-04-27 Robert Bosch Gmbh Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil
DE102016215304A1 (de) * 2016-08-17 2018-02-22 Robert Bosch Gmbh Elektromagnetisch betätigbares Saugventil und Kraftstoff-Hochdruckpumpe
DE102016220364A1 (de) * 2016-10-18 2018-04-19 Robert Bosch Gmbh Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil
DE102016224722A1 (de) * 2016-12-12 2018-06-14 Robert Bosch Gmbh Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil

Also Published As

Publication number Publication date
DE102018218379A1 (de) 2020-04-30

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