EP2507485A1 - Dispositif de réglage électromagnétique - Google Patents

Dispositif de réglage électromagnétique

Info

Publication number
EP2507485A1
EP2507485A1 EP10781510A EP10781510A EP2507485A1 EP 2507485 A1 EP2507485 A1 EP 2507485A1 EP 10781510 A EP10781510 A EP 10781510A EP 10781510 A EP10781510 A EP 10781510A EP 2507485 A1 EP2507485 A1 EP 2507485A1
Authority
EP
European Patent Office
Prior art keywords
actuator
pins
locking
pin
magnetic
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
EP10781510A
Other languages
German (de)
English (en)
Other versions
EP2507485B1 (fr
Inventor
Harald Elendt
Andreas Nendel
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2507485A1 publication Critical patent/EP2507485A1/fr
Application granted granted Critical
Publication of EP2507485B1 publication Critical patent/EP2507485B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/124—Guiding or setting position of armatures, e.g. retaining armatures in their end position by mechanical latch, e.g. detent
    • 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
    • H01F7/1646—Armatures or stationary parts of magnetic circuit having permanent magnet

Definitions

  • the invention relates to an electromagnetic actuating device comprising a housing, two actuator pins which are mounted so as to be movable independently of each other between a rest position retracted in the housing and a working position extended from the housing, and an electrically energizable solenoid device for actuating the actuator pins and two with the actuator pins in the direction of actuation cooperating permanent magnets magnetized in two poles and polarized in the opposite direction opposite polarity aligned with each other and a stationary core region of the magnetic coil means are assigned together.
  • the magnetic coil device is designed to generate depending on their energization in the direction of action reversing magnetic field at the core region, which attracts the first permanent magnet and repels the second permanent magnet and vice versa.
  • Such a control device is particularly suitable for adjusting variable-stroke valve trains of internal combustion engines, the principle of which functions, for example, from DE 10 2004 021 376 A1.
  • the stroke variability of this valve train is based on a cam piece with two cams arranged directly adjacent thereto, the different opening characteristics of which are selectively transferred to a gas exchange valve by means of a conventionally rigid cam follower.
  • the cam piece is non-rotatable, however arranged longitudinally displaceable on a support shaft and has two spiral and oppositely extending sliding grooves, in which the end portions of the actuator pins of two actuating devices (with only one Aktua- torux) alternately coupled.
  • the radial course of each slide groove is designed such that it slides towards the end of the cam Shifting operation is increasingly flatter and relocates the currently engaged actuator pin from its working position back to the rest position.
  • WO 03/021612 A1 proposes an actuating device whose actuation is based on the interaction of a magnetic coil with a permanent magnet fixed to the actuator pin. Due to its magnetic attraction of the spring-loaded in the extension direction actuator pin adheres to the non-energized magnetic coil. For solving the actuator pin from this rest position, only a pulse-shaped current loading of the magnetic coil to overcome the magnetic attraction of the permanent magnet is required, the Aktuatorrob not only by the force of the spring means but also by the force of a magnetic repulsion effect between the permanent magnet and the energized solenoid is accelerated in the direction of the working position. A constructive development of this principle is disclosed in DE 20 2008 008 142 U1.
  • the actuator pin is held there by the magnetic attraction force on a permanent magnet, so that by the mutually eccentric arrangement of actuator pins and permanent magnet magnets / solenoids a compact design of the actuator with two or three selectively controllable actuator pins in a common housing is made possible.
  • An adjusting device of the aforementioned type is apparent from the unpublished DE 10 2009 010 949 A1.
  • the actuating device proposed there has a magnetic coil which is reversible for the purpose of reversing the magnetic field effect, ie is energized with opposite current flow directions. Depending on the magnetic field direction, one of the two actuator pins is actuated in the extension direction, while the other actuator pin remains in its retracted rest position.
  • the required for the electrical control of the actuator power supply device - in the preferred application of said variable stroke valve drive of an internal combustion engine is expediently to the engine control unit - must be provided with a corresponding current reversing circuit, for example in the form of a so-called H-bridge.
  • a corresponding current reversing circuit for example in the form of a so-called H-bridge.
  • H-bridge a so-called H-bridge
  • the present invention is based on the object of further developing an adjusting device of the type mentioned at the beginning in such a way that the aforementioned disadvantages are eliminated by simple means.
  • the actuator should be compatible with conventional control devices without reversing the direction of current or require a slight modification of the control device if necessary in order to be operational in terms of the reversible magnetic field effect.
  • the magnet coil device has two magnet coils which can be energized independently of one another such that when the first magnet coil is energized, the magnetic field is generated with the first effective direction and when the second magnet coil is energized the magnetic field is generated with the reversed second effective direction.
  • the effective direction reversal of the magnetic field at the stationary core region is rather generated by the fact that the adjusting device is provided with two independent and selectively energized magnetic coils.
  • the opposite orientation of the permanent magnet poles then, depending on the momentarily energized magnetic coil, causes the same magnetic field to attract one permanent magnet and repel the other permanent magnet. This force effect is reversed when the other solenoid is energized.
  • the solenoids are preferably sequential in the travel direction, i. arranged in axial series connection around the core area.
  • the actuator pins each a Aktuatorux in the extension direction kraftbeauf sodes spring means, a detent and a cooperating with the actuator pin by means of detent locking pin to be assigned, which holds the associated actuator pin with locked detent in the rest position and in the direction of travel relative to this is relocatable.
  • the head portions of the locking pins facing away from the actuator pins are each provided with one of the permanent magnets. The magnetic field generated when energizing one of the magnetic coils displaces one of the locking pins in the retraction direction to release the associated detent, and force the other of the locking pins in the extension direction to lock the associated detent.
  • the locking pin connected to the first permanent magnet moves in the direction of the core region, ie in the retraction direction of the associated actuator pin, which moves into its working position when the detent is released due to the force of the spring member.
  • the locking pin connected to the second permanent magnet and the associated actuator pin remain at rest when the detent is locked.
  • the permanent magnets should be spaced apart when the head portions of the locking pins on the core area. This is done constructively expediently in that the head portions of the locking pins are raised relative to the permanent magnets.
  • the force effect of the permanent magnets which increases exponentially in the vicinity of the core region, can be limited to such a degree that a sufficient force effect resetting the blocking pins remains with currentless solenoid coils. This force effect should expediently proceed from further spring means, which force the locking pins in the extension direction.
  • the detents should each be formed by the following features:
  • the one or more locking bodies are preferably formed as balls, as they are removable as an extremely cost-effective mass product of a rolling element.
  • three balls and three evenly distributed over the circumference of the actuator pin transverse bores may be provided.
  • This arrangement is advantageous over only one ball insofar as either larger holding forces can be generated with identical dimensioning of the balls or with smaller dimensions of the balls - according to a further reduced space requirements of the detent - the possibly already sufficient holding force only one ball can be generated.
  • the arrangement of circumferentially distributed by 120 ° balls leads to a mechanically favorable, centered support of the locking pin in the longitudinal bore of the actuator pin. Nevertheless, of course, arrangements with only one, two, four or more balls are possible.
  • the balls may be self-locking clamped between the support surfaces, wherein the support surfaces have a constant or a decreasing in the retraction distance from each other.
  • the second support surface may be parallel to the direction of travel of the actuator pin and be part of a production-wise continuous cylindrical guide for the Aktuatorux.
  • both the forces of the spring means and the friction conditions on the ball support surface contacts must be taken into account, so that the area of self-locking required for proper function of the detent is not left at these contacts.
  • the first support surface on the locking pin in the extension direction radially tapers and that the support surfaces are parallel to each other.
  • the support surfaces are formed Vietnameseflgelstumpfförmig. This embodiment enables a particularly low-wear sliding or rolling contact between the balls and the support surfaces when the actuator pin leaves the rest position and reaches again.
  • Figure 1 shows the electromagnetic actuator in longitudinal section
  • FIG. 2 shows a known embodiment of a stroke-variable valve drive of an internal combustion engine which interacts with an adjusting device.
  • FIG. 1 discloses an embodiment of an inventive Stellvor- device 1, which serves to control a basically known variable-stroke valve train of an internal combustion engine.
  • the basic operating principle of such a valvetrain is shown in FIG. 2 and can be summarized to the effect that instead of a conventionally rigid design Camshaft, a support shaft 2 with a rotatably and longitudinally displaceably arranged cam piece 3 is provided.
  • the cam piece 3 has two groups of axially adjacent cams 4 and 5 with different opening curves, which serve for operating point-dependent actuation of gas exchange valves 6.
  • actuator pins 8 and 9 When adjusting device 1 is a mountable in the cylinder head of the engine assembly with a housing 10 and two arranged therein, hollow cylindrical actuator pins 8 and 9.
  • the formed as a common parts actuator pins 8, 9 are mounted in longitudinal guides 1 1 of the housing 10 and can move independently of each other between a retracted in the housing 10 rest position (as shown) and a retracted from the housing 10 working position back and forth. As explained above, in the working position (not shown), the actuator pins 8, 9 are engaged with an associated cam groove of a cam piece to displace the cam piece.
  • the mutually identical detents are each by a Aktua- torburn 8, 9 extending longitudinal bore 15 and these intersecting transverse bores 16, formed on a locking pin 13, 14 first support surface 17 and formed in a housing 10 second support surface 18 and three locking bodies in the form of balls 19 formed.
  • a Aktua- torzer 8, 9 extending longitudinal bore 15 and these intersecting transverse bores 16, formed on a locking pin 13, 14 first support surface 17 and formed in a housing 10 second support surface 18 and three locking bodies in the form of balls 19 formed.
  • which are evenly distributed along the circumference of the actuarial Torxs 8, 9 distributed transverse bores 16 movably arranged balls 19 are clamped in the rest position of the actuator pin 8, 9 between the support surfaces 17 and 18.
  • the extending in the longitudinal bore 15 end portion 20 of the locking pin 13, 14 tapers conically in the extension direction of the Aktuatoruxs 8, 9, so that the first support surface 17 forms the outer circumferential surface of a circular truncated cone.
  • the second support surface 18 in the housing 10 extends at a constant distance thereto and thus forms the inner circumferential surface of a circular truncated cone.
  • the locking pins 13, 14 are each acted upon by a further spring means - here a helical compression spring 21 - also in the extension direction.
  • the angle of inclination of the support surfaces 17, 18 with respect to the direction of travel of the actuator pin 8, 9 is chosen taking into account the spring forces acting on the locking pin 13, 14 and the actuator pin 8, 9 and the Reibungsver conception- on the ball-support surface contacts that the Balls 19 are self-locking between the support surfaces 17, 18 clamped and so fix the actuator pin 8, 9 securely in the rest position.
  • the inclination angle is presently about 5 °.
  • the concentric helical compression springs 12, 21 are based, on the one hand, on bushes 22 pressed in in the housing 10 and, on the other hand, on annular end faces 23 and 24 of the actuator pins 8, 9 and the locking pins 13, 14, respectively. These are electromagnetically kraftbeaufschlagt to release the detents in the retraction of the actuator pins 8, 9 shifted and are provided for this purpose on their the actuator pins 8, 9 facing away from the head sections 25 with permanent magnets 26 and 27 attached thereto. These are axially magnetized in two poles, aligned in the direction of travel of the actuator pins 8, 9 with respect to their north and south poles designated N and S, and exposed to the magnetic field of a magnet coil device.
  • the magnetic coil device comprises, as essential components, a stationary core region 28 and two magnets which can be energized independently of each other. net coils 29 and 30, which are arranged in the direction of movement of the actuator pins 8, 9 successively, ie in axial series connection to the core region 28 and generate a reversible magnetic field, the effective direction of the instantaneous energization state of the magnetic coils 29, 30 depends.
  • the selective power supply of the magnetic coils 29, 30 via a connector 31st The coaxial with the magnetic coils 29, 30 extending core portion 28 has on the part of the permanent magnets 26, 27 has a shoulder which forms a flat contact surface 31 for the locking pins 13, 14.
  • a strongly adhering contact of the permanent magnets 26, 27 on the abutment surface 31 is avoided in that the head portions 25 of the locking pins 13, 14 are raised relative to the permanent magnets 26, 27 and they always have a corresponding minimum distance to the abutment surface 31.
  • the operation of the adjusting device 1 is as follows: the energization of the first solenoid 29 (the second solenoid 30 is energized) generates a magnetic field of first effective direction with south pole on the contact surface 31 of the core region 28, so that the first permanent magnet 26 with its NS - Pole direction attracted and the second permanent magnet 27 is repelled with its S-N-pole alignment. While the ejected second permanent magnet 27, the associated locking pin 14 and consequently also the associated actuator pin 9 remain at rest when the detent is locked, the locking pin 13 tightened with the first permanent magnet 26 is displaced up to the contact surface 31 in the retraction direction. In this case, the associated detent releases by the clamping action of the balls 19 relative to the support surfaces 17, 18 is repealed.
  • the actuator pin 8 is driven by the force of the helical compression spring 12 in its working position.
  • the first solenoid 29 is then de-energized, so that the attracted locking pin 13 by the force of the helical compression spring 21 returns to its original position.
  • the actuator pin 8 which is in engagement with the cam piece is guided by the radially rising discharge area of the displacement. benut pushed back into its rest position and locked there again. This is done by the balls 19 follow the inclined course of the first support surface 17 on the locking pin 13, move radially outward in the transverse bores 16 and are clamped under self-locking between the support surfaces 17, 18.
  • the actuation of the other actuator pin 9 is initiated by the fact that now the second solenoid 30 is energized, while the first solenoid coil 29 remains energized.
  • the reverse direction of action of the magnetic field with a north pole at the abutment surface 31 of the core region 28 abuts the first permanent magnet 26 with its NS pole orientation and attracts the second permanent magnet 27 with its SN pole orientation.
  • the further control curve of the other actuator pin 9 takes place in an identical manner as explained above for the actuator pin 8.

Landscapes

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

Abstract

L'invention concerne un dispositif de réglage électromagnétique (1), comprenant un boîtier (10), deux broches d'actionneur (8, 9), lesquelles sont montées dans le boîtier de façon à pouvoir se déplacer indépendamment l'une de l'autre entre une position de repos entrée et une position de travail sortie, et un dispositif à bobine magnétique pouvant être alimenté de façon électrique pour l'actionnement des broches d'actionneur ainsi que deux aimants permanents (26, 27) coopérant avec les broches d'actionneur dans le sens d'actionnement, lesquels aimants sont orientés l'un par rapport à l'autre avec une polarisation opposée dans le sens de déplacement et sont attribués conjointement à une zone de noyau fixe (28) du dispositif à bobine magnétique. Le dispositif à bobine magnétique est conçu pour générer en fonction de son alimentation électrique un champ magnétique s'inversant dans le sens efficace, lequel champ attire le premier aimant permanent et repousse le second aimant permanent et inversement, et doit présenter à cet effet deux bobines magnétiques (29, 30) pouvant être alimentées indépendamment l'une de l'autre, de telle sorte que le champ magnétique avec le premier sens d'action est généré en cas d'alimentation de la première bobine magnétique et le champ magnétique avec le second sens d'action inversé est généré lorsque la seconde bobine magnétique est alimentée en courant.
EP10781510.2A 2009-12-02 2010-11-24 Dispositif de réglage électromagnétique Not-in-force EP2507485B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009056609A DE102009056609A1 (de) 2009-12-02 2009-12-02 Elektromagnetische Stellvorrichtung
PCT/EP2010/068071 WO2011067142A1 (fr) 2009-12-02 2010-11-24 Dispositif de réglage électromagnétique

Publications (2)

Publication Number Publication Date
EP2507485A1 true EP2507485A1 (fr) 2012-10-10
EP2507485B1 EP2507485B1 (fr) 2013-11-06

Family

ID=43303896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10781510.2A Not-in-force EP2507485B1 (fr) 2009-12-02 2010-11-24 Dispositif de réglage électromagnétique

Country Status (6)

Country Link
US (1) US20120235777A1 (fr)
EP (1) EP2507485B1 (fr)
JP (1) JP5746204B2 (fr)
CN (1) CN102639824B (fr)
DE (1) DE102009056609A1 (fr)
WO (1) WO2011067142A1 (fr)

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JP5821768B2 (ja) * 2012-04-23 2015-11-24 株式会社デンソー 電磁アクチュエータ
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Also Published As

Publication number Publication date
CN102639824B (zh) 2014-12-17
CN102639824A (zh) 2012-08-15
WO2011067142A1 (fr) 2011-06-09
JP5746204B2 (ja) 2015-07-08
US20120235777A1 (en) 2012-09-20
EP2507485B1 (fr) 2013-11-06
JP2013513054A (ja) 2013-04-18
DE102009056609A1 (de) 2011-06-09

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