EP3353411A1 - Soupape, notamment soupape d'aspiration, dans une pompe d'alimentation haute pression d'un système d'injection de carburant - Google Patents

Soupape, notamment soupape d'aspiration, dans une pompe d'alimentation haute pression d'un système d'injection de carburant

Info

Publication number
EP3353411A1
EP3353411A1 EP16754216.6A EP16754216A EP3353411A1 EP 3353411 A1 EP3353411 A1 EP 3353411A1 EP 16754216 A EP16754216 A EP 16754216A EP 3353411 A1 EP3353411 A1 EP 3353411A1
Authority
EP
European Patent Office
Prior art keywords
valve
pump
valve element
contact
region
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
EP16754216.6A
Other languages
German (de)
English (en)
Other versions
EP3353411B1 (fr
Inventor
Achim Koehler
Stefan Kolb
Hans Heber
Tobias Reiser
Namik Karaosmanoglu
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 EP3353411A1 publication Critical patent/EP3353411A1/fr
Application granted granted Critical
Publication of EP3353411B1 publication Critical patent/EP3353411B1/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
    • 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
    • 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
    • F02M59/367—Pump inlet valves of the check valve type being open 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger

Definitions

  • Valve in particular suction valve, in a high-pressure pump of a fuel injection system
  • the invention relates to a valve, in particular a suction valve, in a high-pressure pump of a fuel injection system, with the features of the preamble of claim 1. Furthermore, the invention relates to a pump, in particular a high pressure pump of a fuel injection system, in which the suction valve is used.
  • a high-pressure pump of a fuel injection system with a suction valve is known from DE 10 2010 027 745 AI.
  • the suction valve has a valve element which is movable between an open and a closed position and which is at least indirectly in contact with an actuating element. By the actuating element, an actuating force can be transmitted to the valve element.
  • the high-pressure pump has a pump housing with a housing part, in which in a cylinder bore a pump piston
  • Hubbwewewlich is limited, which limits a pump work space in the cylinder bore.
  • the pump working chamber can be connected via the suction valve with a fuel inlet and connected via a check valve with a high-pressure accumulator.
  • the actuating element can be designed as a magnet armature or acts as a combination of the magnet armature with an intermediate element on the valve element, in particular a pressed intermediate element.
  • the armature is part of an electromagnetic actuator, which also includes a magnetic coil. When the solenoid is energized, a magnetic field is formed whereby the armature moves relative to the solenoid against a spring force to close the working air gap.
  • the embodiment of the suction valve according to the invention with the features of claim 1 has the advantage that an improved expression of the structural elements is achieved, which reduces and / or prevents damage to the surfaces of the two elements by cavitation and resulting cavitation bubbles.
  • An annular arrangement of the region of the mechanical contact about an approximately centrally located region of the cavitation combines the described advantage of claim 1 with the advantage of a higher load capacity due to lower surface pressure and a resulting lower wear in the contact region and, consequently, a longer service life the high pressure pump.
  • a trough-shaped recess on the actuating element and / or on the valve element it is possible to selectively avoid contact of the two elements in the zone of cavitation by geometric shape and size of the trough-shaped recess.
  • the actuating element of the valve element is not formed directly by the armature, but that an intermediate element is used, which is positively connected to the armature.
  • the actuator can thus either have only the armature or it knows the elements magnet armature and intermediate element.
  • an intermediate element makes it possible to select a material for the intermediate element which is better suited for the stresses in the contact region to the valve element than the material of the magnet armature, in particular with regard to the mating intermediate element to the valve element and / or to the surrounding fuel.
  • a trough-shaped recess on the actuating element and / or on the valve element is such that a different shape of both recesses takes place.
  • a further level of detailing this different shape provides that the respective recesses in the edge region of your cross-sectional dimension do not run off congruent, in particular by one of the two recesses in the edge region is formed larger.
  • FIG. 2 shows a section of the pump, designated II in FIG. 1, in an enlarged view with a suction valve,
  • FIG. 3 shows a section of the suction valve designated III in FIG. 2 in an enlarged view.
  • Fig. 1 shows a sectional view of a high-pressure pump 1 shown schematically, which is designed as a high-pressure fuel pump and is preferably installed in a common rail injection system.
  • the high pressure pump 1 is provided by a fuel low pressure system having at least one tank, a filter and a low pressure pump, provided fuel in a high-pressure accumulator, from which the fuel stored there is taken from fuel injectors for injection into the associated combustion chambers of an internal combustion engine.
  • the delivery of the fuel to the pump working space via an electro-magnetic controllable suction valve 2, wherein the electromagnetically controllable suction valve will be explained below, is installed on the high-pressure pump.
  • the high-pressure pump 1 has a pump housing 3 with a camshaft space 5.
  • a camshaft space 5 protrudes a camshaft 7 with a trained example as a double cam cam 9 in.
  • the camshaft 7 is arranged in two bearings arranged on both sides of the cam 9 and designed as radial bearings in the form of a bearing in the pump housing 3
  • the flange 15 has a through opening through which a drive-side end portion 17 of the camshaft 7 protrudes.
  • the drive-side end section 17 has, for example, a cone on which a drive wheel is placed and secured.
  • the drive wheel is formed for example as a pulley or gear.
  • the drive wheel is driven by the internal combustion engine directly or indirectly, for example via a belt drive or a gear transmission.
  • a tappet guide 19 is further inserted, in which a roller 21 having a roller tappet 23 is inserted.
  • roller 21 runs on the cam 9 of the camshaft 7 during a rotational movement of the same and the roller tappet 23 is thus in the tappet guide 19 translationally moved up and down.
  • roller tappet 23 cooperates with a pump piston 18, which is likewise arranged so as to be translatable up and down in a cylinder bore 29 formed in a pump cylinder head 27.
  • a plunger spring 33 is arranged, which is supported on the one hand to the pump cylinder head 27 and on the other hand to the roller tappet 23 and ensures a permanent contact of the roller 21 on the cam 9 in the direction of the camshaft 7 ,
  • a pump working space 35 is formed in extension of the pump piston 18, in which via the electro-magnetic controllable suction valve 2 fuel is introduced.
  • the introduction of the fuel takes place during a downward movement of the pump piston 18, while at an upward movement of the pump piston 18 in the pump chamber 35 befindaji fuel is conveyed via a high-pressure outlet 39 with an inserted outlet valve 16 via a further high-pressure line in the high-pressure accumulator.
  • the high-pressure pump 1 is fuel-lubricated as a whole, the fuel being conveyed by the low-pressure system into the camshaft space 5, which is connected to the suction valve 2 in a fluid-connected manner. This electro-magnetic controllable suction valve 2 and its functionality will be described below.
  • the electro-magnetically controllable suction valve 2 is opened and a connection of the pump working chamber 35 with the Fuel inlet 26 prepared so that the pump working chamber 35 via the suction valve 2 fuel is supplied.
  • the fuel supplied to the pump working chamber 35 is compressed and fed to a high-pressure accumulator (not shown) via the high-pressure valve 16 arranged in the high-pressure outlet 39.
  • the suction valve 2 is closed when fuel delivery is to take place and seals the pump working chamber 35 from the fuel to run 26 from.
  • the illustrated in Fig. 2 attached to the high pressure pump 1 electromagnetically controllable suction valve 2, has a piston-shaped valve member 14 which is acted upon in the closing direction by the spring force of a spring 12, which is therefore hereinafter referred to as closing spring 12.
  • the piston-shaped valve element 14 has a shaft 25, in particular a cylindrically shaped shaft 25, and an enlarged head 34.
  • the pump cylinder head 27 has a valve seat 36 in the contact region to the closed valve element 14.
  • the piston-shaped valve element 14 is guided via the shaft 25 in a bore 38 in the pump cylinder head 27 and has the enlarged diameter in relation to the shaft 25 head 34.
  • a sealing surface 37 is formed, which in
  • FIG. 2 the elements of an electromagnetic actuator are also shown: This has a magnet armature 10 with a cylindrical outer contour and a central bore 32. A strong compression spring 4 is also embedded in this central bore 32 of the armature 10, which exerts an axial force on the armature 10 to the valve element 14 out.
  • the magnet armature 10 is also guided in a liftable axially movable in a carrier element 40. In the radial direction, the magnet armature 10 surrounds a magnetic coil 6, which forms a magnetic field when energized and thus can exert a magnetic force on the magnet armature 10.
  • the valve member 14 is directly or via an intermediate element 8 in contact with the armature 10, wherein both elements are not connected to each other in the axial direction, but are held together only by magnetic forces and spring forces in abutment.
  • the intermediate element 8 is introduced into the magnet armature 10, in particular the intermediate element 8 can be pressed into the magnet armature 10, so that a frictional connection is achieved.
  • the magnet armature 10 taken alone or the combination of the magnet armature 10 with the intermediate element 8 form an actuating element 8, 10.
  • the strong compression spring 4 acts on the intermediate element 8 and the armature 10. The strong compression spring ensures in the de-energized state that the intermediate element 8 acts on the valve element 14 and holds it in the open position.
  • the valve element 14 is held in the open state.
  • the armature 10 By energizing the armature 10 by means of the magnetic coil 6, the armature 10 moves against the force of the compression spring 4 away from the valve element 14 to close the working air gap 28.
  • the intermediate element 8 By moving away the intermediate element 8 loses the frictional contact with the valve element 14 whereby the valve element 14 moves by the force of the closing spring 12 in the closed state. In the fully closed state of the valve element 14, this rests with the sealing surface 37 on the valve seat 36 of the and seals the pump working chamber 35 from the fuel inlet 26 from.
  • FIG. 3 shows the detailed contact area between the intermediate element 8 and the valve element 14. Both elements have mutually facing end faces, which may be at least partially in mechanical contact with each other.
  • Fig. 3 it can be seen that the regions of the mechanical contact 24 between the valve element 14 and the actuating element 8, 10 and the zone 22, in which cavitation can occur, are spatially separated from one another. This is achieved in that the mechanical contact between the actuating element 8, 10 and the valve element 14 is interrupted approximately centrally, since there is the zone 22, can arise in the cavitation, and that the region of the mechanical contact 24 instead by means of an annular Contact area is arranged around the central zone of cavitation.
  • This separation of the areas of mechanical con- Clock 24 and the zone of cavitation 22 can be achieved by means of a trough-shaped recess 20.
  • This trough-shaped recess 20 may be located either in the actuating element 8, 10 or in the valve element 14 or in the two elements 8 and 14.
  • a further specification of the area of the mechanical contact is given by a spherical shaping of the contact contour 30. Since the valve element 14 and the actuating element 8, 10 are guided and supported by different elements, it can lead to positioning errors of both elements to each other, resulting from angular errors or by a Desaxtechnik. This spherical shape of one or both surfaces of each of the valve element 14 and the actuating element 8, 10, which are in contact with each other, allows a tangential contact in the entire position error tolerance range and thus there is an always annular contact surface between the two elements 8 and 14. Through this annular contact surface Surface pressure and wear are reduced and the load capacity is increased by axial forces.
  • the respective shape of the trough-shaped recesses may be different in the actuating element 8, 10 and in the valve element 14 in each case, in particular that the respective recesses are not formed congruent.
  • This shaping of the respective recesses of the actuating element 8, 10 and of the valve element 14 can be so represented that the respective recesses in the edge region of their cross-sectional dimension do not run off congruently,
  • one of the two recesses in the edge region has a larger cross section.

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, notamment une soupape d'aspiration, dans une pompe d'alimentation haute pression d'un système d'injection de carburant, ladite soupape présentant un élément soupape (14) qui peut se déplacer entre une position ouverte et une position fermée et qui est raccordé à un élément d'actionnement (8, 10). Les deux éléments sont, au moins indirectement, en contact mécanique l'un avec l'autre. L'élément d'actionnement (8, 10) peut transmettre une force d'actionnement à l'élément soupape (14) pour déplacer ce dernier dans un état ouvert. Selon l'invention, la surface d'appui entre les deux éléments est pourvue d'évidements en forme d'auge (20) pour séparer la zone du contact mécanique (24) entre les deux éléments de la zone de cavitation (22).
EP16754216.6A 2015-09-21 2016-08-02 Soupape, notamment soupape d'aspiration, dans une pompe d'alimentation haute pression d'un système d'injection de carburant Active EP3353411B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015218054.9A DE102015218054A1 (de) 2015-09-21 2015-09-21 Ventil, insbesondere Saugventil, in einer Hochdruckpumpe eines Kraftstoffeinspritzsystems
PCT/EP2016/068379 WO2017050470A1 (fr) 2015-09-21 2016-08-02 Soupape, notamment soupape d'aspiration, dans une pompe d'alimentation haute pression d'un système d'injection de carburant

Publications (2)

Publication Number Publication Date
EP3353411A1 true EP3353411A1 (fr) 2018-08-01
EP3353411B1 EP3353411B1 (fr) 2019-10-09

Family

ID=56741016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16754216.6A Active EP3353411B1 (fr) 2015-09-21 2016-08-02 Soupape, notamment soupape d'aspiration, dans une pompe d'alimentation haute pression d'un système d'injection de carburant

Country Status (3)

Country Link
EP (1) EP3353411B1 (fr)
DE (1) DE102015218054A1 (fr)
WO (1) WO2017050470A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020022076A1 (fr) * 2018-07-27 2020-01-30 日立オートモティブシステムズ株式会社 Pompe à carburant

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19915686A1 (de) * 1999-04-07 2000-10-12 Delphi Tech Inc Schaltventil
DE10148861A1 (de) * 2001-10-04 2003-04-24 Bosch Gmbh Robert Injektor zum Einspritzen von Kraftstoff in die Brennkammer einer Brennkraftmaschine
US7866575B2 (en) * 2009-01-12 2011-01-11 GM Global Technology Operations LLC Pressure actuated fuel injector
DE102010027745A1 (de) 2010-04-14 2011-10-20 Robert Bosch Gmbh Hochdruckpumpe
FR2973092B1 (fr) * 2011-03-25 2016-09-02 Bosch Gmbh Robert Dispositif d'obturation, regulateur de pression comportant un tel dispositif, dispositif d'injection diesel comportant un tel regulateur, moteur diesel et vehicule comportant un tel moteur
DE102012218593A1 (de) * 2012-10-12 2014-04-17 Continental Automotive Gmbh Ventil für eine Pumpe

Also Published As

Publication number Publication date
WO2017050470A1 (fr) 2017-03-30
EP3353411B1 (fr) 2019-10-09
DE102015218054A1 (de) 2017-03-23

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