EP1007825A1 - Dispositif permettant d'actionner une soupape de changement des gaz a l'aide d'un actionneur electromagnetique - Google Patents

Dispositif permettant d'actionner une soupape de changement des gaz a l'aide d'un actionneur electromagnetique

Info

Publication number
EP1007825A1
EP1007825A1 EP98940271A EP98940271A EP1007825A1 EP 1007825 A1 EP1007825 A1 EP 1007825A1 EP 98940271 A EP98940271 A EP 98940271A EP 98940271 A EP98940271 A EP 98940271A EP 1007825 A1 EP1007825 A1 EP 1007825A1
Authority
EP
European Patent Office
Prior art keywords
damping
armature
magnet
piston
cylinder
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.)
Withdrawn
Application number
EP98940271A
Other languages
German (de)
English (en)
Inventor
Matthias Gramann
Roland Krebser
Rosario Pepe
Thomas Stolk
Dirk Strubel
Alexander Von Gaisberg
Klaus Wunderlich
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.)
Conti Temic Microelectronic GmbH
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
Temic Telefunken Microelectronic 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 DaimlerChrysler AG, Temic Telefunken Microelectronic GmbH filed Critical DaimlerChrysler AG
Publication of EP1007825A1 publication Critical patent/EP1007825A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means

Definitions

  • the invention relates to a device for actuating a gas exchange valve with an electromagnetic actuator according to the preamble of patent claim 1.
  • Electromagnetic actuators for actuating gas exchange valves generally have two switching magnets, an opening magnet and a closing magnet, between the pole faces of which an armature is arranged so as to be displaceable coaxially with a gas exchange valve axis of the gas exchange valve.
  • the armature acts on the valve stem of the gas exchange valve via an armature tappet.
  • a preloaded spring mechanism usually two preloaded compression springs, acts on the armature, namely an upper and a lower valve spring.
  • the upper valve spring acts in the opening direction and the lower valve spring in the closing direction of the gas exchange valve.
  • the closing magnet or the opening magnet is briefly overexcited or the armature is excited in its resonance frequency by an oscillation routine in order to attract it from the equilibrium position.
  • the armature is in the closed position of the gas exchange valve with a first contact surface on the pole surface of the energized closing magnet and is held by this.
  • the closing magnet biases the valve spring acting in the opening direction.
  • the closing magnet is switched off and the opening magnet is switched on.
  • the valve spring acting in the opening direction accelerates the armature beyond the equilibrium position, so that it is attracted by the opening magnet.
  • the armature meets with its second contact surface on the pole surface of the opening magnet and is held by it.
  • the opening magnet is switched off and the closing magnet is switched on.
  • the valve spring acting in the closing direction accelerates the armature beyond the equilibrium position to the closing magnet.
  • the armature is attracted by the closing magnet, hits the pole face of the closing magnet and is held by it.
  • the armature should only be braked shortly before the pole faces and move as freely as possible in the remaining area between the pole faces, ie against a low back pressure, so that the damping affects the control characteristics of the gas exchange valve and the efficiency and the gas exchange valve opens smoothly, quickly, almost completely and can be closed.
  • a large volume change is required to build up sufficient back pressure for gaseous media.
  • the gas must be compressed far in front of the pole face in order to achieve sufficient damping shortly before the pole face.
  • the gas exchange valve closes and opens more slowly over wide areas, which in turn requires energy to be supplied.
  • a damping device for a valve control is known from US Pat. No. 4,794,890, in which a hydraulic damping is combined with an elastic damping.
  • the valve control has two anchors, an upper closing anchor and a lower opening anchor, which are between two pole faces an upper closing magnet and a lower opening magnet are slidably arranged.
  • the locking armature In the closed position, the locking armature is held by the locking magnet. If the gas exchange valve is opened, the closing magnet repels the closing anchor and the opening anchor is attracted to the opening magnet.
  • a device for electromagnetic control of globe valves by means of an actuator in which the coil springs arranged on both sides of the armature with their end assigned to the armature via a damping sleeve and a cone fixedly attached to a valve stem on the valve stem and thus on Support anchor.
  • the damping sleeve which serves as a spring plate, consists of a material that is elastically resilient in the radial direction and lies with a conical lateral surface, the cone angle of which is chosen close to the self-regulating angle, on a corresponding lateral surface of the cone attached to the valve stem.
  • the object of the invention is to reduce the excess energy of the armature and the valve in a short way in front of the pole face of the magnet with as few additional components as possible, without the holding forces having to be increased significantly.
  • a separate damping element i.e. with its own component provided with a damping piston and a cylinder, which can be displaced relative to each other by a non-gaseous medium
  • precisely defined counterforces can be created to brake the armature shortly before a pole face of a magnet without the armature and the gas exchange valve between the magnets are prevented from moving. If the damping piston or the cylinder is moved against a non-gaseous material, a high counterforce can be generated over a short distance. Part of the excess energy can be absorbed temporarily before it is broken down in the damping element. Gaseous media are excluded because a large volume change is required for a sufficiently high back pressure and thus a large distance.
  • damping element In closed, pressurized systems with gas, a high back pressure can be achieved over short distances, but a large proportion of the kinetic energy is converted into clamping energy, which means that the magnet must apply an increased holding force so that the armature does not move away from the pole face is catapulted. Damping material emerging from the damping element can hinder the function of individual components, for example in the case of oil, the pole faces of the magnets and the contact faces of the armature can become oiled, as a result of which the armature detaches more poorly from the pole faces.
  • the damping element form a closed system in itself, ie the damping material is tightly sealed to the outside.
  • the armature should be decelerated from a high speed by a large counterforce to a low speed in front of the pole face and should be able to be attracted to the pole face at the low speed with almost no counterforce by the magnet, directly at the low speed. After detaching the contact surface of the armature from the pole surface, the damper should return to its starting position as quickly as possible.
  • damping material is oil
  • this can be achieved with a throttle in one direction and with a check valve with a large flow area in the other direction.
  • Such properties can be created specifically in the case of plastic elastomers, as a result of which these materials are particularly suitable for this use.
  • Such substances are known to the person skilled in the art under the name "bouncing putty" and are preferably based on organosilicon polymers.
  • FIG. 1 shows an actuator for actuating a gas exchange valve with a built-in damping element
  • FIG. 2 shows an enlarged section of the damping element from FIG. 1
  • FIG. 3 shows a variant of FIG. 2.
  • FIG. 1 shows a device for actuating a gas exchange valve 1 with an actuator 2, which has an opening magnet 3 and a closing magnet 4.
  • An armature 7 is arranged axially displaceably between pole faces 5, 6 of the magnets 3, 4.
  • the armature 7 alternately strikes the pole faces with its contact surfaces 8, 9 and is held by the magnets 3, 4 in two separate switching positions.
  • the armature 7 is fastened on an armature tappet 22 or embodied in one piece with it, with which it acts on a valve stem 23 of the gas exchange valve 1.
  • the actuator 2 has a spring system 24 below the opening magnet 3 with a lower valve spring 25 acting in the closing direction and with an upper valve spring 26 acting in the opening direction.
  • the lower valve spring 25 is supported in the direction of the gas exchange valve 1 on the component 27 and in the Gas exchange valve 1 facing away from a spring plate 28 attached to the valve stem 23.
  • the upper valve spring 26 is supported in the direction of the gas exchange valve 1 on a spring plate 29 fastened on the armature tappet 22 and in the direction remote from the gas exchange valve 1 on the opening magnet 3.
  • the valve springs 25, 26 are preloaded to the extent that the armature 7 adjusts to an approximately middle position between the switching magnets 3, 4 when the solenoids 3, 4 are undisturbed and immediately before the closed position of the gas exchange valve 1 a residual closing force of the lower valve spring 25 and immediately before a residual prestressing force of the upper valve spring 26 is present in the open position.
  • the actuator 2 If the actuator 2 is started, either the closing magnet 4 or the opening magnet 3 is overexcited or the armature 7 is excited with its resonance frequency using an oscillation routine in order to move it to a pole face 5, 6 and hold it there.
  • the armature 7 rests with its first contact surface 9 against the pole surface 6 of the energized closing magnet 4 and is held by it.
  • the closing magnet 4 biases the upper valve spring 26 acting in the opening direction.
  • the closing magnet 4 In order to open the gas exchange valve 1, the closing magnet 4 is switched off and the opening magnet 3 is switched on.
  • the valve spring 26 acting in the opening direction accelerates the armature 7 beyond the equilibrium position, so that it is attracted by the opening magnet 3.
  • the armature 7 meets with its second contact surface 8 on the pole surface 5 of the opening magnet
  • the damping element 10 consists of a damping piston 11 which is displaceably mounted in a cylinder 12 against a damping material 13 (FIGS. 2 and 3), it also being possible for the cylinder to be displaceable and the piston to be fixed.
  • the damping piston 11 protrudes from the pole face 6 of the closing magnet 4 in the direction of the contact face 9 of the armature 7, and acts directly on the armature 7. Additional components and moving masses are saved, for example plunger attached to the armature 7, via which the damping element 10 acts on the armature 7 Anchor 7 acts.
  • the damping piston 11 preferably protrudes from the pole face 6 to such an extent that the speed of the armature 7 can be braked to almost zero in the shortest possible way to the pole face 6.
  • the damping element 10 is mounted in the closing magnet 4 in the direction of movement 19. This can be achieved via a large number of different adjustment mechanisms familiar to the person skilled in the art, such as, for example, via clamping mechanisms, adjustment screws, etc.
  • the cylinder 12 is adjustably mounted in the recess 14 via an external thread 20 in an internal thread 21.
  • the recess 14 extends in the direction of movement 19 of the damping piston 11 through the entire closing magnet 4, from the pole face 6 to the side of the closing magnet 4 facing away from the gas exchange valve 1.
  • the internal thread 21 extends over the entire recess 14, whereby the damping element 10 of the side of the closing magnet 4 facing away from the gas exchange valve 1 is adjustable, mountable and, if necessary, removable and replaceable.
  • a locking device not shown, such as a lock nut, a locking screw or any other mechanism familiar to the person skilled in the art.
  • a non-gaseous, preferably plastically deformable damping material 13 is used, against which the damping piston 11 is displaced.
  • the requirements for the material 13 result from the task of the damping element 10 to generate a large counterforce at a high speed of the armature 7 in order to brake the armature 7 in a short way and at a low speed of the armature 7 directly in front of the pole face 6 generate as small a counterforce as possible that the armature 7 can be easily attracted to the pole face 6 by the closing magnet 4.
  • the damping element 10 should exert as little force as possible on the armature act so that the holding force of the closing magnet 4 does not have to be increased significantly.
  • the damping element 10 should quickly return to its starting position before the damping process.
  • the damping element 10 should represent a system which is closed to the outside, as a result of which no escaping substances impede the remaining functions of the device.
  • the large opposing forces at high and the small opposing forces at low speeds of the armature 7 are preferably achieved by viscous or pasty materials 13, the shear stress of which increases sharply with the rate of deformation.
  • viscous or pasty materials 13 the shear stress of which increases sharply with the rate of deformation.
  • the viscous materials 13 can also be easily sealed to the outside.
  • the damping piston 11 is displaceably mounted via a fit in the cylinder 12, which is sufficient as a seal for correspondingly viscous materials 13. Additional seals can be saved.
  • the space is formed by a recess 16 on the side of the damping piston 11 facing away from the armature 7.
  • a spring 15 which is supported against the material 13 by a piston 17 guided in the recess 16. If the armature 7 deflects the damping piston 11, the material 13 is displaced into the recess 16 and thereby pushes the piston 17 against the spring 15 into the recess 16.
  • the damping piston 11 builds up a high counterforce against the direction of movement of the armature 7.
  • the armature 7 is braked to a low speed, so that almost only the spring force has to be overcome by the closing magnet 4 in order to fully attract the armature 7 to the pole face 6.
  • the spring 15 moves the damping piston 11 back into the starting position.
  • the starting position is determined by a stop 32 in the cylinder 12, against which the damping piston 11 runs with a step 33.
  • a spring 15 can be dispensed with if materials are used which have an elasticity corresponding to the spring 15, i.e. do not generate a too large counterforce when the armature 7 bears against the pole face 6 and nevertheless generate a sufficient force to return the damping piston 11 to its initial position as soon as the armature 7 detaches itself from the pole face 6.
  • the space into which the material 13 can escape could also be arranged in the cylinder 12 instead of in the damping piston 11. Furthermore, the space and the spring could be combined by pushing the material against a membrane.
  • FIG. 2 shows an embodiment of the damping element 10 according to the invention without a piston 17.
  • the material 13 surrounds the spring 15 and fills the space between the damping piston 11 and the cylinder 12 except for small spaces (not shown) by pre-stretching the material 13 enclosed space completely. If the damping piston 11 is deflected by the armature 7, a damping effect arises in particular by the spring 15 shifting in the material 13, taking it along and displacing it together with the damping piston 11 into the free spaces.
  • damping plate 18 which is attached to the end face of the damping piston 11 facing the armature 7.
  • a shock-absorbing plastic is particularly suitable as the material for the damping plate 18, although other materials that appear suitable to a person skilled in the art for such a purpose can also be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnets (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un dispositif permettant d'actionner une soupape de changement des gaz à l'aide d'un actionneur possédant un aimant d'ouverture et un aimant de fermeture. Un induit pouvant être inséré axialement entre les faces polaires de ces aimants, entre alternativement en contact avec ces faces polaires par ses surfaces de démarrage et est freiné au moins devant une face polaire par un dispositif d'amortissement. Le dispositif d'amortissement est constitué d'un élément d'amortissement séparé comprenant un piston d'amortissement et un cylindre qui se rétractent en comprimant un agent non gazeux, assurant ainsi l'amortissement.
EP98940271A 1997-08-30 1998-08-08 Dispositif permettant d'actionner une soupape de changement des gaz a l'aide d'un actionneur electromagnetique Withdrawn EP1007825A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19737967A DE19737967A1 (de) 1997-08-30 1997-08-30 Vorrichtung zum Betätigen eines Gaswechselventils mit einem elektromagnetischen Aktuator
DE19737967 1997-08-30
PCT/EP1998/005052 WO1999011908A1 (fr) 1997-08-30 1998-08-08 Dispositif permettant d'actionner une soupape de changement des gaz a l'aide d'un actionneur electromagnetique

Publications (1)

Publication Number Publication Date
EP1007825A1 true EP1007825A1 (fr) 2000-06-14

Family

ID=7840723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98940271A Withdrawn EP1007825A1 (fr) 1997-08-30 1998-08-08 Dispositif permettant d'actionner une soupape de changement des gaz a l'aide d'un actionneur electromagnetique

Country Status (3)

Country Link
EP (1) EP1007825A1 (fr)
DE (1) DE19737967A1 (fr)
WO (1) WO1999011908A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919246A1 (de) * 1999-04-28 2000-11-02 Schaeffler Waelzlager Ohg Hydraulischer Anschlagdämpfer
DE10249690A1 (de) * 2002-10-25 2004-05-06 Bayerische Motoren Werke Ag Elektromagnetische Ventiltriebvorrichtung für einen Verbrennungsmotor mit einem Elektromagneten, an dem ein bewegliches Element angeordnet ist
DE10338639A1 (de) * 2003-08-22 2005-03-17 Bayerische Motoren Werke Ag Elektromagnetische Ventiltriebvorrichtung mit einer Endlagendämpfung des Ankers
DE102022113262A1 (de) 2022-05-25 2023-11-30 Zf Cv Systems Europe Bv Pneumatisches Magnet-Wegeventil, Pneumatikmodul und pneumatisches System

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1471861A (en) * 1921-09-07 1923-10-23 Perrault Oscar Louis Valve-actuating mechanism for internal-combustion engines
JPS606566Y2 (ja) * 1979-07-03 1985-03-02 日産自動車株式会社 バルブ緩衝装置
DE3024109A1 (de) 1980-06-27 1982-01-21 Pischinger, Franz, Prof. Dipl.-Ing. Dr.Techn., 5100 Aachen Elektromagnetisch arbeitende stelleinrichtung
DE3311250C2 (de) * 1983-03-28 1985-08-01 FEV Forschungsgesellschaft für Energietechnik und Verbrennungsmotoren mbH, 5100 Aachen Vorrichtung zur elektromagnetischen Betätigung eines Gaswechselventils für Verdrängungsmaschinen
DE3500530A1 (de) * 1985-01-09 1986-07-10 Binder Magnete GmbH, 7730 Villingen-Schwenningen Vorrichtung zur elektromagnetischen steuerung von hubventilen
US4794890A (en) 1987-03-03 1989-01-03 Magnavox Government And Industrial Electronics Company Electromagnetic valve actuator
DE3920931A1 (de) 1989-06-27 1991-01-03 Fev Motorentech Gmbh & Co Kg Elektromagnetisch arbeitende stelleinrichtung
DE19646938A1 (de) * 1996-11-13 1998-05-14 Bayerische Motoren Werke Ag Elektromagnetische Betätigungsvorrichtung für ein Brennkraftmaschinen-Hubventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9911908A1 *

Also Published As

Publication number Publication date
DE19737967A1 (de) 1999-03-04
WO1999011908A1 (fr) 1999-03-11

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