WO1998042960A1 - Dispositif d'entrainement electromagnetique - Google Patents

Dispositif d'entrainement electromagnetique Download PDF

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Publication number
WO1998042960A1
WO1998042960A1 PCT/EP1998/001719 EP9801719W WO9842960A1 WO 1998042960 A1 WO1998042960 A1 WO 1998042960A1 EP 9801719 W EP9801719 W EP 9801719W WO 9842960 A1 WO9842960 A1 WO 9842960A1
Authority
WO
WIPO (PCT)
Prior art keywords
electromagnetic drive
drive according
spring
movable part
electromagnetically
Prior art date
Application number
PCT/EP1998/001719
Other languages
German (de)
English (en)
Inventor
Heinz Karl Leiber
Original Assignee
Lsp Innovative Automotive Systems 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
Priority claimed from DE19712063A external-priority patent/DE19712063A1/de
Priority claimed from DE19714412A external-priority patent/DE19714412A1/de
Priority claimed from DE19717405A external-priority patent/DE19717405A1/de
Priority claimed from DE19730191A external-priority patent/DE19730191A1/de
Application filed by Lsp Innovative Automotive Systems Gmbh filed Critical Lsp Innovative Automotive Systems Gmbh
Priority to EP98919136A priority Critical patent/EP0970298B1/fr
Priority to DE59804515T priority patent/DE59804515D1/de
Publication of WO1998042960A1 publication Critical patent/WO1998042960A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • 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
    • 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
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2105—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids comprising two or more coils
    • F01L2009/2109—The armature being articulated perpendicularly to the coils axes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1692—Electromagnets or actuators with two coils

Definitions

  • the invention relates to an electromagnetic drive with a movably mounted, electromagnetically movable part which is brought into end positions when the excitation currents are switched on alternately, an element, in particular a valve, of an internal combustion engine being driven by the movement of the electromagnetically movable part.
  • Such an electromagnetic drive is known from DE 3616540 AI.
  • a lever indirectly driven by an armature is directly coupled to a valve to be driven.
  • An actuating rod with lateral play is coupled between the articulation point of the lever, which is provided by a torsion spring, and the lever end, which actuates the valve stem, which is connected to and driven by the armature of the electromagnetic drive.
  • the actuating rod and thus the armature are stored separately using a roller bearing.
  • electromagnetic vibration drives with a spring bearing of the armature are known.
  • the armature is mounted on a leaf spring clamped on one side, in the other document, a torsion spring is provided for storage, on the non-clamped end of which a rotary anchor is fastened.
  • the invention has for its object to provide an electromagnetic drive of the type mentioned, which has a very low bearing friction and can also be operated with lower power due to a reduction in moving masses and optimal power transmission.
  • the electromagnetic drive has a lever articulated at its end, which carries the electromagnetically movable part directly.
  • the solution according to the invention creates a simplified, low-wear bearing with only low friction. This means that permanent oil lubrication is not required.
  • the lever is direct, i.e. Without an intermediate part, which carries the electromagnetically movable part, the acting forces are transmitted directly without connecting elements, which results in a mass reduction which results in a lower actuation power.
  • the drive is formed by two electromagnets, between the poles of which an armature can be moved back and forth as an electromagnetically movable part by alternately switching the excitation currents.
  • the drive is formed by a magnetic circuit, in particular a permanent magnet, in the magnetic field of which a part having a coil can be electrodynamically moved back and forth as an electromagnetically movable part by alternately switching the excitation currents.
  • a special weight reduction also results from the exclusive mounting of the lever by means of the torsion bar according to claim 9, which results in an improved efficiency of the drive due to a weight saving.
  • Optimal utilization of the acting forces results in a construction according to claim 10.
  • the element to be driven e.g. a valve-acting actuator is attached between the lever bearing and the electromagnetically movable part, there is a reduction in the stroke due to the lever ratios e.g. of the anchor.
  • the force required and the effective movable mass for moving a valve are reduced accordingly, so that the drive can be correspondingly smaller and lighter. Because of the smaller magnet volumes, it is possible to dimension the magnetic circuit somewhat larger in the area of the magnetic yoke, which advantageously results in lower iron losses.
  • Fig. 1 is a torsion bearing of an anchor in one
  • Fig. 13 shows an alternative drive with one in one
  • a torsion spring (torsion bar or rotary tube) bearing according to the invention is shown in principle. With this storage, the masses to be accelerated are very small.
  • a double magnetic drive is shown which consists of magnetic cores 1 and 2 with magnetic poles 3 and 4, windings 5 and 6 wound on the cores and an armature 7 which moves in the field of the magnets. When one of the electromagnets (1, 3, 5) or (2, 4, 6) is actuated, the armature 7 is drawn towards the magnetic poles 3 or 4 from the intermediate position shown (eg middle position).
  • the magnetic poles 3 and 4 are formed obliquely in order to be adapted to the course of the armature 7 rotated about the axis 10.
  • the detailed structure of the torsion bar can be seen in FIG. 3.
  • a torsion bar 30 is rigidly clamped here at 31.
  • a support bearing 32 which allows rotation, e.g. a needle bearing or plain bearing is provided.
  • a bearing lever in the form of a cage 33 is connected, which in turn receives the armature 37.
  • An actuating rod is also rotatably mounted on this cage 33 by means of a bearing 29.
  • the shaft 34 of the bearing is e.g. connected to the cage 33 via a screw connection or rivets.
  • the axis 10 is the axis of rotation of the torsion bar.
  • the cage 33 of FIG. 3 can also be the bearing lever 11 of the armature 7 in FIG. 1.
  • the anchor 37 is e.g. riveted into the cage 33. In FIG. 3 the rivet pins can be seen to the right and left of the bearing shaft 34.
  • an actuating rod 12 is rotatably connected to the armature 7 or the bearing lever 11 via a bearing 13, which in turn is connected via a coupling member 15 with e.g. a valve lifter 16 is connected.
  • a coupling member 15 with e.g. a valve lifter 16 is connected.
  • Fig. 2 corresponds to Fig. 1 with the difference that here the restoring forces are formed by the torsion bar 20 and a valve return spring 32 and with a certain deflection in each direction a further spring force is effective, which the restoring force from the end position elevated.
  • this additional restoring force is realized by a leaf spring pair 23/24 clamped at the right end and an extension 25 of the armature 27, which must also bend one of the leaf springs 23 or 24 from a certain deflection. This is also shown in FIG. 3 in a different view.
  • FIGS. 2 and 3 show the course of the sum of the two-stage return spring shown in FIGS. 2 and 3.
  • This two-stage spring has the advantage that the spring characteristic is better adapted to the magnetic force curve FM. The system can therefore be moved from the rest position to the end position without the usual start-up process.
  • the steep spring characteristic of the second spring brings about a correspondingly high braking of the armature arriving from the opposite end position, which contributes significantly to the damping and position control.
  • the possible high final force of the spring contributes to a high initial acceleration and thus quick valve opening.
  • a torsion bar 52 is provided for mounting an armature 50, which corresponds to the torsion bar 20 of FIG. 2.
  • the torsion bar 52 is connected to the armature 50 by means of a bearing lever 51, so that the armature can be moved up or down by two electromagnets (magnetic circuit 53 and 55 and windings 54 and 56).
  • the torsion bar generates both spring forces.
  • An actuating rod 57 is articulated on the bearing lever 51 and is connected to a valve tappet 59 by means of an overtravel spring 58. By means of this overtravel spring 58, the valve is also moved during an armature movement.
  • overtravel spring 58 makes it a large one compared to the direct coupling, for example according to FIG Load on the valve seat due to the inertia of the valve and armature avoided.
  • windings 54 and 56 In addition to the windings 54 and 56, further holding windings 60 and 61 are arranged on the magnetic circuit 53 and the magnetic circuit 55 and hold the armature 50 in the corresponding end position during its actuation.
  • FIG. 6 differs from FIG. 5 in particular in that the armature 70 is held in its end positions by a locking roller 71 and not by a holding current.
  • the locking roller 71 which is locked in Fig. 6 under a locking plate 72 connected to the armature 70, is triggered to trigger the armature movement downwards by a locking magnet 73 and a rocker 75 connected thereto, about which an axis 74, on which the locking roller is mounted , moved out of the snap.
  • the torsion springs now accelerate the armature 70 downward and a current pulse on the lower coil finally brings the armature into the other end position.
  • the locking roller mounted on the holder 74 rolls along the locking plate 72 until it engages again in the other end position.
  • the locking magnet 73 and the holder 75 are held in the drawn position by a spring, not shown, directed against the force of the locking magnet.
  • the actuating rod 57 is not articulated directly on the armature 50 but on the bearing lever 51. As a result, the paths of the armature and the valve are different. The end of the actuating rod 57 lies on the valve stem head in the central position. In Fig. 6 it is assumed that the engine is warm. The residual air gap 76 is small here because the overtravel spring allows a corresponding armature movement regardless of the valve extension without a stop, so that the locking roller 71 engages.
  • the actuating rod is designated 87, the valve stem 89.
  • the overtravel spring 88 is connected to the actuating rod 87 and engages in a fork-like manner in a groove of the valve tappet 89.
  • Fig. 7b the e.g. welded stop (85.86) can be seen.
  • the parts 85, 86, 87 can consist of one piece.
  • the overtravel spring 88 When the overtravel spring 88 is bent open, the fork of the overtravel spring comes to a stop with the lower ends of the parts 85 and 86, so that a further upward bending is no longer possible. Also shown is a resilient fork-shaped centering element 84 which centers the actuating rod 87 on the valve stem 89.
  • overtravel spring can be made redundantly from two springs 90.
  • a spring 98 is shown with an envelope 99, which acts as a catch plate and causes that at If the overtravel spring 98 breaks, the valve can be moved into the closed end position via the stop without hitting the piston.
  • the use of a redundant spring 90 brings high reliability.
  • the use of the enveloping spring enables the valve to be closed and shut down in an emergency.
  • the overtravel spring can also be arranged between the actuating rod 107 and the connecting part 101.
  • the stop is effected here by a pin 103 and an elongated hole 102.
  • Fig. 10 also shows an adjusting screw 104 with which the distance, i.e. the valve clearance between the actuating rod and valve tappet, the coupling of which is stiff here, can be adjusted.
  • the 11 shows an example in which the actuating rod 117 is again connected to the bearing lever 111 via a spring 118.
  • the spring 118 here is a leaf / spiral spring. A wear-free joint is thereby possible, and a kink protection can be provided for the bending spring 118.
  • the actuating rod 117 could be articulated on the bearing lever 111 by means of a leaf spring joint.
  • the aim of this is to increase the driving force of the electromagnetic drive in order to either use this higher force or to reduce the magnets while the force remains the same.
  • This design is particularly advantageous for reducing the moving masses, in which the armature has a relatively large proportion. Here the effective mass is reduced linearly with increasing lever ratio.
  • the gear ratio is used here. This training is particularly advantageous when using the electromagnetic drive for valve control of internal combustion engines because the great force is needed in the end positions and the air gap of the armature is not dominant.
  • the torsion bar is shown schematically at 120.
  • the bearing lever 121 is shown as a line; the anchor bears the reference numeral 122, the actuating rod the reference numeral 123.
  • the actuating rod 123 is now connected at a distance 11 from the bearing point 120 to the bearing lever 121, while the center of the armature is 12 away therefrom.
  • the magnetic force FM is shown as arrow 124.
  • the force FR acting on the actuating rod 123 is calculated as:
  • an electrodynamic drive can also be used, e.g. is known from loudspeaker technology.
  • the excitation coil 130 of the system is spring-loaded by a torsion bar 131 according to FIG. 13.
  • the electromagnetic drive described above can be used to drive a gas exchange valve or another comparable valve. It can also be used to drive a pump, the valve tappet being replaced by a pump piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un dispositif d'entraînement électromagnétique comportant un élément mobile (7) qui peut être déplacé par effet électromagnétique, de façon à effectuer des mouvements alternatifs, et qui est amené dans les positions extrêmes par application alternée de courants excitateurs. L'élément mobile (7), par son déplacement, commande un autre élément (16), notamment une soupape d'un moteur à combustion interne, et un levier (11) articulé à son extrémité le supporte directement.
PCT/EP1998/001719 1997-03-24 1998-03-24 Dispositif d'entrainement electromagnetique WO1998042960A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98919136A EP0970298B1 (fr) 1997-03-24 1998-03-24 Dispositif d'entrainement electromagnetique de soupape
DE59804515T DE59804515D1 (de) 1997-03-24 1998-03-24 Elektromagnetischer ventilantrieb

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE19712063A DE19712063A1 (de) 1997-03-24 1997-03-24 Elektromagnetischer Antrieb
DE19712063.6 1997-03-24
DE19714412A DE19714412A1 (de) 1997-04-08 1997-04-08 Elektromagnetischer Antrieb
DE19714412.8 1997-04-08
DE19717405.1 1997-04-24
DE19717405A DE19717405A1 (de) 1997-04-24 1997-04-24 Elektromagnetischer Antrieb E 13
DE19730191.6 1997-07-15
DE19730191A DE19730191A1 (de) 1997-07-15 1997-07-15 Elektromagnetischer Antrieb

Publications (1)

Publication Number Publication Date
WO1998042960A1 true WO1998042960A1 (fr) 1998-10-01

Family

ID=27438581

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/001719 WO1998042960A1 (fr) 1997-03-24 1998-03-24 Dispositif d'entrainement electromagnetique

Country Status (3)

Country Link
EP (1) EP0970298B1 (fr)
DE (1) DE59804515D1 (fr)
WO (1) WO1998042960A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000039435A1 (fr) 1998-12-28 2000-07-06 Heinz Leiber Dispositif d'entrainement pour une soupape d'un moteur a combustion interne
WO2000071860A1 (fr) 1999-05-25 2000-11-30 Heinz Leiber Moteur a combustion interne
DE19948207A1 (de) * 1999-10-07 2001-04-12 Heinz Leiber Elektromagnetischer Aktuator
EP1215370A1 (fr) * 2000-12-15 2002-06-19 Renault Dispositif d'entrainement lineaire d'une soupape au moyen d'aimants mobiles
FR2818431A1 (fr) * 2000-12-15 2002-06-21 Renault Dispositif d'entrainement lineaire d'une soupape au moyen d'aimants mobiles
FR2854489A1 (fr) * 2003-04-30 2004-11-05 Jacques Clausin Actionnement electromagnetique a palette oseillante, puissant et rapide dont les mouvements et les efforts sont parfaitement controles par des moyens de commande specifiques a l'actionneur
GB2407209A (en) * 2003-10-14 2005-04-20 Visteon Global Tech Inc Compact pivoting electromagnetic valve actuator

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6606789U (de) 1968-02-22 1970-12-03 Dynamit Nobel Ag Elektromagnetischer vibrationsantrieb.
DE2334211A1 (de) * 1973-07-05 1974-11-21 Schneider Co Optische Werke Stellmotor
GB1471537A (en) * 1974-12-06 1977-04-27 Venard R Engine valve control
GB1524322A (en) 1976-01-23 1978-09-13 British Internal Combust Eng Electromagnetic vibration exciter
GB2088137A (en) * 1980-11-21 1982-06-03 Veisz Gyoergy Magnetomechanical converter
JPS57173914A (en) * 1981-04-20 1982-10-26 Ricoh Co Ltd Position selecting mechanism
WO1994002769A1 (fr) * 1992-07-17 1994-02-03 Mks Instruments, Inc. Vanne regulatrice de debit a diaphragme pivotant
WO1997017561A1 (fr) * 1994-11-09 1997-05-15 Aura Systems, Inc. Soupape a armature a charniere et a commande electromagnetique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6606789U (de) 1968-02-22 1970-12-03 Dynamit Nobel Ag Elektromagnetischer vibrationsantrieb.
DE2334211A1 (de) * 1973-07-05 1974-11-21 Schneider Co Optische Werke Stellmotor
GB1471537A (en) * 1974-12-06 1977-04-27 Venard R Engine valve control
GB1524322A (en) 1976-01-23 1978-09-13 British Internal Combust Eng Electromagnetic vibration exciter
GB2088137A (en) * 1980-11-21 1982-06-03 Veisz Gyoergy Magnetomechanical converter
JPS57173914A (en) * 1981-04-20 1982-10-26 Ricoh Co Ltd Position selecting mechanism
WO1994002769A1 (fr) * 1992-07-17 1994-02-03 Mks Instruments, Inc. Vanne regulatrice de debit a diaphragme pivotant
WO1997017561A1 (fr) * 1994-11-09 1997-05-15 Aura Systems, Inc. Soupape a armature a charniere et a commande electromagnetique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 017 (E - 154) 22 January 1983 (1983-01-22) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000039435A1 (fr) 1998-12-28 2000-07-06 Heinz Leiber Dispositif d'entrainement pour une soupape d'un moteur a combustion interne
WO2000071860A1 (fr) 1999-05-25 2000-11-30 Heinz Leiber Moteur a combustion interne
DE19948207A1 (de) * 1999-10-07 2001-04-12 Heinz Leiber Elektromagnetischer Aktuator
EP1215370A1 (fr) * 2000-12-15 2002-06-19 Renault Dispositif d'entrainement lineaire d'une soupape au moyen d'aimants mobiles
FR2818431A1 (fr) * 2000-12-15 2002-06-21 Renault Dispositif d'entrainement lineaire d'une soupape au moyen d'aimants mobiles
FR2854489A1 (fr) * 2003-04-30 2004-11-05 Jacques Clausin Actionnement electromagnetique a palette oseillante, puissant et rapide dont les mouvements et les efforts sont parfaitement controles par des moyens de commande specifiques a l'actionneur
GB2407209A (en) * 2003-10-14 2005-04-20 Visteon Global Tech Inc Compact pivoting electromagnetic valve actuator

Also Published As

Publication number Publication date
EP0970298B1 (fr) 2002-06-19
EP0970298A1 (fr) 2000-01-12
DE59804515D1 (de) 2002-07-25

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