EP1270930B1 - Vanne electromagnetique pour piloter un injecteur d'un moteur a combustion interne - Google Patents

Vanne electromagnetique pour piloter un injecteur d'un moteur a combustion interne Download PDF

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Publication number
EP1270930B1
EP1270930B1 EP02010811A EP02010811A EP1270930B1 EP 1270930 B1 EP1270930 B1 EP 1270930B1 EP 02010811 A EP02010811 A EP 02010811A EP 02010811 A EP02010811 A EP 02010811A EP 1270930 B1 EP1270930 B1 EP 1270930B1
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EP
European Patent Office
Prior art keywords
armature
solenoid valve
electromagnet
valve
valve according
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.)
Expired - Lifetime
Application number
EP02010811A
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German (de)
English (en)
Other versions
EP1270930A1 (fr
Inventor
Rainer Haeberer
Andreas Wengert
Ralf Maier
Stefan Haug
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
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Filing date
Publication date
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Publication of EP1270930A1 publication Critical patent/EP1270930A1/fr
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Publication of EP1270930B1 publication Critical patent/EP1270930B1/fr
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
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a solenoid valve for controlling a Injector of an internal combustion engine with the in the preamble of claim 1 specified characteristics.
  • Such known from DE 196 50 865 A1 known solenoid valve is used to control the fuel pressure in the control pressure chamber.
  • an injector such as an injector one Common rail injection system, related. In such injectors is about the fuel pressure in the control pressure chamber controlled the movement of a valve piston, with the one Injection opening of the injection valve open or closed becomes.
  • the well-known solenoid valve has one in one Housing part disposed electromagnet, one in one Slider guided and acted upon by a closing spring, axially movable armature and one moved with the armature Control valve member, which with a valve seat of the solenoid valve interacts and so the fuel drain from the Control pressure chamber controls.
  • the anchor has an anchor plate and an anchor bolt formed in a bore sliding mechanical guide of the slider is stored.
  • a solenoid valve for Control of an injection valve of an internal combustion engine known to have a housing, an electromagnet with Magnetic coil and magnetic core, as well as an anchor and a Control valve member for opening and closing a Having fuel passage.
  • the anchor is inside one Spacer ring through a thin metal guide disc positioned, the two diametrically opposed, arcuately extending resilient fingers, the are welded end to end on the anchor.
  • This mechanical Anchor guidance means by providing the Metal guide disc and by the required Process step of welding parts and production costs, the economic production of the solenoid valve conflict.
  • the anchor is free of mechanical guide in the radial direction movably arranged in the housing part.
  • a guide means for the anchor arise savings in the manufacturing and working steps of Solenoid valve.
  • the anchor formed as a disc-shaped anchor plate which is opposite with their from the electromagnet Side acts directly on the control valve member, a particularly flat construction of the anchor is achieved. Be beneficial to the anchor in the closed position of the solenoid valve transmitted by the closing spring Tipping moments greatly reduced.
  • Anchor plate and control valve member are advantageous as a separate Made components so that the radially movable Can move anchor plate relative to the control valve member, without the control valve member necessarily from its centric Position is moved relative to the valve seat. A side impact of the control valve member next to the Valve seat and associated with friction losses sliding in the valve seat is thereby largely avoided.
  • the armature when a current is applied to the electromagnet in the radial direction by acting on the armature magnetic Reluctance forces in a relative to the central axis the electromagnet centric position is alignable.
  • This can advantageously be achieved in that the anchor and the magnetic core at their mutually facing pole faces concentric about their respective central axis arranged geometric Have structures which structures when energized of the electromagnet interact in such a way that the anchor is aligned in the centric position.
  • FIG. 1 shows the upper part of a fuel injection valve, which is intended for use in a fuel injection system is, in particular a common rail system for diesel fuel, which is equipped with a high pressure fuel storage is continuous by a high pressure pump supplied with high-pressure fuel.
  • the fuel injector has a valve housing 4 with a longitudinal bore 5, in which a valve piston 6 is arranged, with his an end, not shown in Fig. 1 on one in a Nozzle body arranged valve needle acts.
  • the valve needle is arranged in a pressure chamber, which has a pressure bore supplied with high-pressure fuel.
  • At a Opening stroke of the valve piston 6 is the valve needle through the constantly on a pressure shoulder of the valve needle attacking fuel high pressure in the pressure chamber against the Clamping force of a spring not shown raised.
  • valve piston 6 By a then connected to the pressure chamber injection port takes place the injection of the fuel into the combustion chamber of Internal combustion engine.
  • the valve piston 6 By lowering the valve piston 6 is the valve needle in the closing direction in the valve seat of the injector pressed and the injection process ended.
  • Valve piston 6 Of the Valve piston 6 is facing away from the valve needle at its End guided in a cylinder bore 11, which in a valve piece 12 is inserted, which is inserted into the valve housing 4 is.
  • the front side closes of the valve piston 6 a control pressure chamber 14, which via a Inlet channel with a high-pressure fuel connection, not shown connected is.
  • the inlet channel is essentially formed in three parts.
  • an inlet throttle 15 is with a the valve member 12 circumferentially surrounding annular space 16th constantly connected, which annulus in turn in constant communication with the high-pressure fuel connection.
  • the control pressure chamber 14 in the high-pressure accumulator exposed to high fuel pressure.
  • the valve piston 6 branches from the control pressure chamber 14 a in the valve piece 12 extending bore, one with a Outflow throttle 18 provided fuel drain channel 17 forms which opens into a relief space 19, with a in Fig. 1, not shown fuel low pressure connection connected is.
  • the exit of the fuel drain passage 17 from the Valve piece 12 takes place in the region of a conically countersunk Part 21 of the end face of the valve piece 12.
  • the valve piece 12 is in the embodiment shown here by means of one provided with two mutual clamping shoulders Clamping element 23 together with a housing part 39 of the Solenoid valve via a screw member 7 in the valve housing. 4 clamped.
  • the valve piece 12 has a circumferential Flange 13, which on an annular shoulder 47 of the Valve housing 4 rests.
  • the flange 13 is between clamping element 23 and valve housing 4 clamped.
  • a dial 48 At the other from the valve housing 4 facing away from the shoulder of the clamping element 23.
  • the housing part 39 of the solenoid valve is located with a peripheral edge portion on the dial 48.
  • the screw member 7 is enclosed a clamping shoulder on the solenoid valve housing 39 and is on the valve housing 4 screwed.
  • this embodiment is with only one screw member 7, the solenoid valve housing 39 fixed to the valve housing 4 and at the same time the valve piece 12 clamped.
  • a valve seat 24 is formed, with a control valve member 22,25 of the injection valve controlling solenoid valve cooperates.
  • the control valve member 22,25 is in two parts with a valve ball 25 and a the valve ball 25 receiving socket part 22 is formed and coupled to an armature 27, which electromagnet with a El 29 of the solenoid valve cooperates.
  • the armature 27 and the control valve member 22,25 form as separate parts.
  • the of the valve ball 25 facing away from the base part 22 is as a flat Support surface for the armature 27 is formed.
  • the armature 27 is in one piece and essentially as a circular disc-shaped Anchor plate formed.
  • the anchor plate has a the electromagnet 29 facing pole surface 37 and one facing away from it flat surface 36, which directly on the base 22nd the control valve member acts.
  • From the center of the pole surface 37 of the armature 27 is a pin 35 from perpendicular, in a Recess 10 of the electromagnet 29 engages, in the also a closing spring 31 is arranged, which is located on the pin 35th supported.
  • the armature 27 and the control valve member coupled to the armature 22,25 are constantly fixed by the housing supporting closing spring 31 acted upon in the closing direction, so that the control valve member 22,25 normally in the closed position abuts the valve seat 24.
  • the armature 27 Upon excitation of the electromagnet the armature 27 is in the axial direction of the valve seat 24th deducted and the drainage channel 17 to the discharge chamber 19 out open.
  • the electromagnet comprises 29, a magnetic coil 32 and a magnetic core 33.
  • the magnetic core 33 has an annular on its pole face 38 Recess 41, in which the magnetic coil 32 is arranged is. Terminals 34 of the magnetic coil are through the magnetic core 33 led to the outside.
  • a current is applied to the electromagnet forms over the gap between the pole surface portion 44 and the pole face 37 of the armature and the gap between the pole face 37 of the armature and the pole face portion 45 of the magnetic core is a closed magnetic circuit out.
  • a so-called magnetic bonding of the anchor at Magnetic core 33 to prevent can, as shown in Fig. 3 is, for example, by a layer 26 of a magnetically non-conductive material on the pole face 37 of the Anchor plate can be achieved.
  • the layer 26 are made of chrome or Teflon.
  • the layer Can be done by soldering, welding, gluing or other suitable Way to be connected to the anchor.
  • pole face 38 of the armature 27 and the magnetic core 33 insert one or more spacers.
  • the minimum distance between anchor plate and magnetic core is the anchor with structures protruding from pole face 37 (e.g., dimples) to be provided, which at the electromagnet or a supported in the solenoid inserted sleeve.
  • the anchor plate at one in the Electromagnet introduced and from the pole face 38 of the Magnet core 33 projecting sleeve to the plant.
  • the opening and closing of the injector will be as follows described controlled by the solenoid valve.
  • the anchor bolt 27 is constantly through the closing spring 31 is acted upon in the closing direction, so that the control valve member 25 with non-energized electromagnet in the closed position abuts the valve seat 24 and the control pressure chamber 14 is closed towards the discharge side 19, so that there over the inlet channel very quickly the high Pressure builds up, which is also present in the high-pressure fuel storage.
  • the pressure in the control pressure chamber 14 generates a closing force on the valve piston 6 and the associated standing valve needle, which is larger than the other hand in Opening direction due to the upcoming high pressure acting Forces.
  • control pressure chamber 14 by opening the solenoid valve opened to the discharge side 19, builds the pressure in the small volume of the control pressure chamber 14th very quickly, since this over the inlet throttle 15 of the High pressure side is disconnected. As a result, outweighs the force acting on the valve needle in the opening direction the pending on the valve needle fuel high pressure, so that the valve needle moves upward while the at least an injection port is opened for injection.
  • the solenoid valve closes the fuel drain passage 17, the pressure in the control pressure chamber 14 through the over rebuilt the inflow channel 15 nachf jobden fuel be, so that the original closing force is pending and the valve needle of the fuel injection valve closes.
  • the armature 27 of the invention Solenoid valve in the housing part 39 of the solenoid valve be moved in the radial direction, without a mechanical guidance to be prevented.
  • a radial Movement of the armature 27 may be the surface 36 of the anchor plate slide along the base part 22 along.
  • the closing spring 31 presses the armature 27 and the control valve member 22,25 against the valve seat 24, wherein the mechanically unguided anchor plate in a decentralized Meeting on the base part 22 can tilt something.
  • the control valve member 25 always reliable in the valve seat 24 pressed. Due to the flat design of the Ankers 27 as disc-shaped anchor plate are the tilting moments compared to a T-shaped anchor with from the anchor plate projecting anchor bolt also greatly reduced.
  • Fig. 2 shows a further embodiment of the invention.
  • the basic structure of the solenoid valve shown in Fig. 2 is Similar to in Fig. 1.
  • the same parts have the same reference numerals.
  • the plate-shaped anchor 27 in contrast to Fig. 1 at its the electromagnet facing side here a central recess 40, in which engages the closing spring 31.
  • the point of attack of Closing spring 31 is particularly close to the ball 25th the control valve member, so that acting on the armature Tipping moments with closed solenoid valve even further reduced become.
  • the valve piece 12 with a clamped separate clamping member 23 in the valve housing 4.
  • the solenoid valve housing 39 is connected to the screw member 7 via an intermediate disc 48 directly on the valve housing 4 attached.
  • the anchor plate by means of magnetic reluctance forces is centered to decenter the anchor plate and a resulting tilting of the anchor plate at Avoid striking the control valve member.
  • This can be achieved in that the armature 27 and the magnetic core 33 of the electromagnet 29 provided with geometric structures are, which when energizing the electromagnet 29 cooperate such that the armature 27 in a centric Position is aligned, in which a central axis 49 of the armature 27 coaxial with the central axis 30 of the electromagnet runs (the central axis 49 and the central axis 30 are on a straight line).
  • the electromagnet 29 a magnetic core 33 and a coil 32.
  • the magnetic core 33 is with a concentric to its central axis 30 extending groove-shaped recess 41 provided, in which the coil 32 is introduced.
  • the pole surface 38 of the magnetic core 33 in an outer annular Pol vomabêt 44 and an inner Pol vomabrough 45 divided.
  • the peculiarity of this embodiment consists in the recess 42, which in the magnetic core 33 facing pole face 37 of the armature 27 concentric with Center axis 45 of the armature is introduced.
  • These too annular recess 42 has in the form of a circumferential groove in about the same outer diameter and inner diameter and thus the same width d as the recess 41 of the magnetic core 33 on.
  • the mutually associated recesses 41 and 42 interact magnetically such that at a Current applied to the electromagnet, the central axis 49 the armature 27 coaxial with the central axis 30 of the electromagnet runs.
  • the magnetic centering effect is explained from magnetic reluctance forces, which at a radial Deflection of the anchor plate occur.
  • Are the recesses 41 and 42 are not arranged congruently one above the other, so become the magnetic field lines at the edges of the two Recesses 41.42 distorted.
  • the resulting reluctance forces pull the anchor plate back up until the Recesses 41, 42 congruent superimposed and the central axis 49 of the armature coaxial with the central axis 30 of the Electromagnet 29 extends.
  • the recess needs 42 not necessarily circumferentially introduced into the armature 27 be. It is also possible to be concentric with the central axis 49 arranged segments or other suitable training to use.
  • the pole face 37 of the armature 27 formed without a recess, but has an outer diameter on, which is slightly larger than the inner diameter the outer pole surface portion 44 of the magnetic core.
  • the outer diameter of the pole face 37 of the armature designed to be less than a millimeter larger than the inner diameter of the outer pole surface portion 44 of Magnet core 33.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Claims (11)

  1. Soupape électromagnétique pour la commande d'un injecteur d'un moteur à combustion interne, comprenant une partie boítier (39), un électro-aimant (29) qui possède une bobine magnétique (32) et un noyau magnétique (33), un induit (27) mobile axialement entre l'électro-aimant (29) et un siège de soupape (24) et sollicité par un ressort de soupape (31), et un organe de soupape de commande (22, 25) qui se déplace avec l'induit (27) et coopère avec le siège de soupape (24) pour ouvrir et fermer un passage de carburant (17),
    caractérisée en ce que
    dans la partie boítier (39) l'induit (27) est mobile dans la direction radiale sans moyens de guidage mécaniques.
  2. Soupape électromagnétique selon la revendication 1,
    caractérisée en ce que
    l'induit (27) a la forme d'une plaque d'induit en forme de disque, qui agit directement sur l'organe de soupape de commande (22, 25) par son côté (36) éloigné de l'électro-aimant (29).
  3. Soupape électromagnétique selon la revendication 2,
    caractérisée en ce que
    la plaque d'induit (27) et l'organe de soupape de commande (22, 25) sont des pièces séparées et la plaque d'induit est mobile en translation dans la direction radiale par rapport à l'organe de soupape de commande.
  4. Soupape électromagnétique selon une des revendications 1 à 3,
    caractérisée en ce qu'
    en présence d'une excitation électrique de l'électro-aimant (29), l'induit (27) peut être aligné dans la direction radiale par des forces de réluctance magnétiques agissant sur l'induit (27), dans une position centrée relativement à l'axe médian (30) de l'électro-aimant.
  5. Soupape électromagnétique selon la revendication 4,
    caractérisée en ce que
    l'induit (27) et le noyau magnétique (33) présentent au niveau de leurs surfaces polaires (37, 38) dirigées l'une vers l'autre des structures géométriques (41, 42, 43, 44) concentriques autour de leur axe médian respectif (30, 49), et qui coopèrent en présence d'une excitation électrique de l'électro-aimant (29) de telle manière que l'induit (27) s'aligne dans la position centrée.
  6. Soupape électromagnétique selon une des revendications 4 ou 5,
    caractérisée en ce que
    dans la position centrée, l'axe médian (49) de l'induit (27) est concentrique au passage de carburant (17).
  7. Soupape électromagnétique selon la revendication 5,
    caractérisée en ce que
    les structures géométriques sont formées par des évidements (41, 42) ménagés dans les surfaces polaires (37, 38) du noyau magnétique (33) et de l'induit (27) qui sont dirigées l'une vers l'autre, et ces évidemments se superposent l'un au-dessus de l'autre dans la position centrée (figure 3).
  8. Soupape électromagnétique selon la revendication 7,
    caractérisée en ce que
    la surface polaire (38) du noyau magnétique (33) qui est dirigée vers l'induit (27) présente un premier évidement annulaire (41) logeant la bobine magnétique (32), et la surface polaire (37) de l'induit (27) dirigée vers l'électro-aimant (29) présente un deuxième évidement (42) associé à ce premier évidement (41), en forme d'anneau ou de partie d'anneau, concentrique autour de l'axe médian (49) de l'induit (27).
  9. Soupape électromagnétique selon la revendication 5,
    caractérisée en ce que
    la structure géométrique du noyau magnétique (33) est formée par un segment de surface polaire (44) du noyau magnétique qui est en forme de couronne de cercle et entoure la bobine magnétique (32), et la structure géométrique de l'induit (27) est formée par une surface polaire (37) circulaire ou en forme de couronne de cercle, dont le diamètre extérieur est un peu plus grand que le diamètre intérieur du segment de surface polaire (44) en forme de couronne de cercle du noyau magnétique (33). (Figure 4).
  10. Soupape électromagnétique selon la revendication 9,
    caractérisée en ce que
    le diamètre extérieur de la surface polaire (37) de l'induit (27) est supérieur de moins d'un millimètre au diamètre intérieur du segment de surface polaire (44) en forme de couronne de cercle du noyau magnétique (33).
  11. Soupape électromagnétique selon une des revendications 1 à 10,
    caractérisée en ce que
    le siège de soupape (24) est centré dans une surface tronconique (20) en saillie vers l'induit (27) et appartenant à un élément de soupape (12) qui renferme le passage de carburant (18), et l'espace entourant la surface tronconique (20) forme un logement pour un écrou de serrage (23) fixant l'élément de soupape (12) dans l'injecteur (figure 2).
EP02010811A 2001-06-28 2002-05-15 Vanne electromagnetique pour piloter un injecteur d'un moteur a combustion interne Expired - Lifetime EP1270930B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10131201 2001-06-28
DE10131201A DE10131201A1 (de) 2001-06-28 2001-06-28 Magnetventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP1270930A1 EP1270930A1 (fr) 2003-01-02
EP1270930B1 true EP1270930B1 (fr) 2004-11-24

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EP02010811A Expired - Lifetime EP1270930B1 (fr) 2001-06-28 2002-05-15 Vanne electromagnetique pour piloter un injecteur d'un moteur a combustion interne

Country Status (4)

Country Link
US (1) US6764061B2 (fr)
EP (1) EP1270930B1 (fr)
JP (1) JP3738237B2 (fr)
DE (2) DE10131201A1 (fr)

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EP1270930A1 (fr) 2003-01-02
JP2003049747A (ja) 2003-02-21
US6764061B2 (en) 2004-07-20
US20030020039A1 (en) 2003-01-30
DE10131201A1 (de) 2003-01-16
DE50201600D1 (de) 2004-12-30
JP3738237B2 (ja) 2006-01-25

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