WO2012085393A1 - Device for actuating at least one value using an electromagnetic actuator - Google Patents

Device for actuating at least one value using an electromagnetic actuator Download PDF

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Publication number
WO2012085393A1
WO2012085393A1 PCT/FR2011/052976 FR2011052976W WO2012085393A1 WO 2012085393 A1 WO2012085393 A1 WO 2012085393A1 FR 2011052976 W FR2011052976 W FR 2011052976W WO 2012085393 A1 WO2012085393 A1 WO 2012085393A1
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WO
WIPO (PCT)
Prior art keywords
rod
pin
actuator
support
stop
Prior art date
Application number
PCT/FR2011/052976
Other languages
French (fr)
Inventor
Nicolas Gelez
Julien Hobraiche
Gabriel KOPP
Original Assignee
Valeo Systemes De Controle Moteur
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 Valeo Systemes De Controle Moteur filed Critical Valeo Systemes De Controle Moteur
Publication of WO2012085393A1 publication Critical patent/WO2012085393A1/en

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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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L13/0005—Deactivating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/06—Cutting-out cylinders
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • 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
    • F01L2013/0089—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 with means for delaying valve closing
    • F01L2013/0094—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 with means for delaying valve closing with switchable clamp for keeping valve open
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/031—Electromagnets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to the field of control of an internal combustion engine and in particular the disconnection of the intake and exhaust valves of an internal combustion engine, for example spark ignition.
  • An engine comprises an engine block delimiting combustion chambers, each of which receives a movable piston and which is associated with air and fuel intake means and exhaust gas exhaust means.
  • the efficiency of the internal combustion engines depends in particular on the filling rate of the combustion chambers by air.
  • the control system passes only the amount of air needed to ensure the engine load. This has the effect of pumping the engine and degrading engine performance.
  • the deactivation of the combustion chambers is obtained by neutralizing the opening of the intake and exhaust valves of said chambers.
  • valve disconnection device As described in US2002 / 0014217 and illustrated in FIG. 1.
  • a valve disconnection device consists of a valve 1, shown partially sliding in the cylinder head and kept in a stable position closed by a return spring.
  • the valve 1 makes it possible to close an intake hole supplying air to a cylinder situated under the valve 1.
  • the head 3 of the valve 1 is in contact with a first end 4 of an actuating element, here a pawl 2
  • a second end 5 of the pawl 2 having a hemispherical concave bearing, rests on a hemispherical head 6 of an abutment 7.
  • the stop 7 is inserted into a cylindrical housing in the cylinder head 12 and comprises a body 10 in which a rod 11 slides on which is fixed the hemispherical head 6.
  • a compression spring is disposed between the body 10 and the rod 11 and maintains the contact between the hemispherical head 6 and the pawl 2.
  • the stop 7 comprises finally a latch 13 which immobilizes the rod 11 in the body 10 and which comprises two fingers 16 diametrically opposed and spaced by a spring.
  • the latch 13 is deactivated by feeding a hydraulic circuit 15 whose fluid will press the fingers 16 of the latch 13 and bring them closer together.
  • the fingers 16 then leave their housing 14 and under the forces exerted by the latch 2 on the stop 7, the rod 11 will slide in the body 10 and lengthen the spring 18.
  • the stop 7 is said to be unlocked as shown in FIG. illustrates the latch 13 in its disabling position of the valve.
  • the pawl 2 is therefore supported on the one hand on the valve 1 and on the other hand on the head 6 of the abutment 7.
  • the spring 18 of the abutment 7 being more flexible than the return spring of the valve 1, it is the second end 5 of the pawl 1 which will oscillate, preventing the cam 9 from transmitting its movement to the valve 1.
  • the hemispherical head 6 is thus reciprocated between a high position corresponding to the upper position of the cam 9 and a low position corresponding to the low position of the cam 9.
  • the valve 1 remains closed and the corresponding cylinder is thus deactivated
  • valve disconnection device is however difficult to implement because the implementation of hydraulic circuits is relatively complex and expensive.
  • this type of system offers response times too long to be able to establish optimal engine management strategies.
  • the device described by the document US2002 / 0014217 further comprises hydraulic means for catching up games 53 disposed in the hemispherical head and which make it possible to compensate for the operating and wear gaps of the device. These means of catching games are known to those skilled in the art and will not be detailed further.
  • the aim of the invention is to propose a device for actuating the valves of a combustion engine making it possible to remedy at least in part these disadvantages.
  • a device for actuating at least one valve comprising a support and at least one actuating element which is pivotally mounted and / or sliding relative to the support and which rests by a first pressing on the valve and by a second support on a stop, characterized in that the stop comprises:
  • a rod mounted to slide relative to the support and provided with an apex in contact with the actuating element
  • the locking means comprising a pin mounted to slide perpendicularly to the stop between an activation position in which the pin is received in a circular groove arranged in the rod to block the sliding of the rod and a deactivation position in which the pin releases the sliding of the rod.
  • Electromagnetic actuators do not require hydraulic circuits and have shorter transition times, which allows the use of more complex control strategies.
  • the locking means comprise a pin mounted to slide perpendicular to the stop between an activation position in which the pin is received in an opening in the rod to block the sliding of the rod and a deactivation position in which the pin releases the sliding of the rod.
  • the pin has a beveled end in contact with the rod.
  • the actuating element is for example a pawl.
  • the pawl also called rocker
  • the first support is based on a fixed point, formed for example by a hydraulic play retraction stop, and the second support rests on the valve stem.
  • the stop forms for example for the latch a fixed point.
  • the stop is in particular a hydraulic stop.
  • a cam comes for example to bear on the pawl via an intermediate region of the pawl, this intermediate region being disposed between the two ends of the pawl.
  • the rod may extend along a longitudinal axis and the annular groove may be arranged around this longitudinal axis.
  • the locking means may be configured to lock the rod at a single height in the support, this height corresponding to the direction of the longitudinal axis of the rod, unlike for example the locking means disclosed in the US patent 5 875 748 which allow locking of the rod at two different heights in the support.
  • the electromagnetic actuator may be exclusively electromagnetic, that is to say that the displacement of the pin is only due to a magnetic force.
  • the electromagnetic actuator is for example different from an actuator implementing both hydraulic means and magnetic means, as for example described in application FR 2 512 493 in which a valve is electromagnetically actuated to allow a fluid to flow. move a lock.
  • the actuator is preferably a linear actuator.
  • the pin may be formed by several pieces rigidly coupled together, for example by hooping or screwing.
  • the pin may comprise a first part made of a ferromagnetic material and subjected to the magnetic field generated by the actuator, in particular electromagnets in the actuator. This first piece is for example immersed inside the actuator and in particular surrounded by the electromagnets.
  • the pin may comprise a second piece which locks the rod by cooperating with the circular groove formed therein. This second piece may be made of a material different from that used for the first piece.
  • the second part is advantageously made of a material that makes it possible to withstand the locking forces.
  • the first and second parts can both be moved in the same translational movement by the magnetic field generated by the actuator.
  • This first and second pieces can be interdependent.
  • the first piece of the pin and the second piece of the pin above may have no degree of freedom between them.
  • FIG. 1 is a side sectional view of a valve actuating device according to the prior art
  • FIG. 2 is a partial schematic cross-sectional view of a valve actuating device according to a first embodiment of the invention
  • FIG. 3 is an enlarged schematic view of a portion of the actuating device illustrated in FIG. 2 and showing a first embodiment of a locking device according to the invention
  • FIG. 4 is a diagrammatic cross-sectional view of a first actuator used in a locking device illustrated in FIG. 3 and of the stable type in the connected position;
  • FIG. 5 is a diagrammatic cross-sectional view of a second actuator used in a locking device illustrated in FIG. 3 and of the stable type in the disconnected position;
  • FIG. 6 is a diagrammatic cross-sectional view of a third actuator used in a locking device illustrated in FIG. 3 and of the bistable type;
  • FIG. 7 is a schematic perspective view of two adjacent valves and their respective locking devices
  • FIG. 8 is a partial schematic cross-sectional view of a valve actuating device according to a second embodiment of the invention.
  • FIG. 9 is a partial schematic cross-sectional view of a valve actuating device according to a third embodiment of the invention.
  • FIG. 10 is a partial sectional view of a locking means corresponding to the third embodiment of the invention.
  • FIG. 11 is an enlarged schematic view of a portion of the actuating device illustrated in Figure 2 and showing a second embodiment of a locking device according to the invention.
  • the idea underlying the invention is to provide a stop that can be locked and unlocked thanks to an electromechanical actuator.
  • FIG. 2 illustrates an exemplary embodiment of this invention.
  • the abutment 7 comprises a rod 11, cylindrical, which slides in a cylindrical housing 19 formed in the yoke 12 along a vertical axis.
  • a rotational stop 21 makes it possible to maintain only a translational movement between the rod 1 1 and the housing 19 and to ensure the position of connection and disconnection of the housing 27 with the pin 26.
  • a return spring 18 is placed between the bottom of the housing 19 and a base 23 of the rod 11 corresponding to its lower end.
  • the rod 11 also has a top 22 on which a second end 5 of the actuating element rests, here a pawl 2.
  • the first end 4 of the pawl 2 bears on the valve head 1 which is simply here schematically.
  • the abutment 7 comprises a locking device 25 comprising a cylindrical pin 26 which slides through the yoke 12 and the housing 19 of the abutment 7 along an axis perpendicular to the vertical axis.
  • the pin 26 is housed in a cylindrical opening 27 formed in the rod 11 and adapted to receive said pin 26.
  • the locking device 25 also comprises an electromechanical actuator 28 which moves the pin 26 between two stable positions:
  • the actuator 28 also exerts a permanent force on the pin as it has not reached the connected position.
  • the rod 11 slides freely in the housing 19, the return spring 18 maintaining contact between the top 22 and the end 4 of the pawl 2 and opposing the action of the end 4 of the pawl 2.
  • the return spring 18 being more flexible than the holding spring of the valve 1, the cam 9 transmits its movement to the rod 11 and not to the valve 1.
  • the rod 11 follows the movement of the second end 5 of the latch 2 and the top 22 adopts a path passing through a high point corresponding to the high point of the cam 9 and a low point corresponding to the low point of the cam 9.
  • the valve 1 is no longer actuated, it remains closed and the corresponding cylinder is deactivated.
  • an electromechanical actuator attached to the abutment simplifies the system.
  • the abutment no longer includes a hydraulic circuit or moving parts internal to the rod.
  • the use of an electromechanical actuator allows a better responsiveness of the device and also allows the use of complex engine control strategies.
  • the actuator can be attached to the stop, its change is easy.
  • Figure 3 illustrates a detail of the valve actuator according to a particular embodiment of the invention.
  • 3 illustrates an end 30 extending the body of the pin 26 partially engaged in the opening 27 of the rod 1 1.
  • the end 30 of the pin 26 is bevelled so as to have an angle with a plane perpendicular to the vertical axis of the abutment 7.
  • An upper edge 29 of the opening 27 of the rod 11 rests on the end 30 of the pin.
  • the angle a is between 5 ° and 20 ° so that when the rod 11 rests on the pin 26, the latter is locked in position.
  • the body of the pin has a section greater than the passage section of the opening 27 so that only a portion of the tapered end 30 of the pin 26 can be introduced into the opening 27 .
  • the bevel of the end 30 of the pin 26 facilitates the engagement of the pin 26 in the opening 27, keep the pin 26 in position and catch the games of the device.
  • the pin 26 is in the deactivated position, the rod 11 being engaged in its housing 19 and the return spring 18 being compressed, it is decided to block at again the stop 7 to reconnect the valve 1.
  • the pin 26 is first released and bears on the rod 11 because the actuator 28 maintains a force on the pin 26 until it is in the activation position of the valve.
  • the rod 11 follows the movement of the pawl 2 and the cam 9 and begins its ascent until the opening 27 is in front of the pin 26.
  • the pin 26 will then engage in the opening 27 until the tapered end 30 contacts the upper edge 29 of the opening 27, which blocks the progression of the pin 26.
  • the rod 11 continues its movement until the top 22 of the rod 11 reaches the high point of its trajectory, defined by the movement of the cam 9. At this moment, the pin 26 is engaged at the maximum in the opening 27 and the rod 11 is immobilized.
  • the locking position of the rod 11 corresponds to the high point of the cam 9, which ensures that, whatever the wear of the pin 26, the top 22 of the rod 11 or the second end 5 of the pawl 2, the fixed point defined by the top 22 of the rod 11 will always be in the same position.
  • FIG. 4 illustrates a first type of actuator 28 of the stable type in the activated position.
  • the actuator 28 comprises a housing 32, a pin 26 sliding in the housing 32 and a compression spring 31 which exerts a permanent force on the pin 26 and keeps it in the activation position of the valve.
  • the actuator 28 also comprises an electromagnet 33 and a core 34 spaced from the pin 26 by an air gap 25.
  • ⁇ electromagnet 33 is not powered, the compression spring 31 holds the pin in the activation position of the valve and when electromagnet 33 is energized, it attracts pin 26 and moves it a distance equal to gap 25 to place it in the deactivated position of the valve. Without power, the actuator 28 is stable in the activation position of the valve.
  • FIG. 5 illustrates a second type of actuator 28 of the stable type in the deactivated position of the valve.
  • This second actuator 28 is similar to the first actuator described in FIG. 4, but here the compression spring is arranged to hold the pin 26 in the deactivated position of the valve when the electromagnet is not energized.
  • FIG. 6 illustrates a third type of non-current bistable actuator comprising a housing 32, a pin 26 sliding in the housing 32 and a compression spring 31 which exerts a permanent force on the pin 26 and keeps it in the activation position of the valve.
  • the actuator 28 also comprises an electromagnet 33 and a permanent magnet 34 spaced from the pin 26 by an air gap 25.
  • ⁇ electromagnet 33 When ⁇ electromagnet 33 is not energized, the compression spring 31 holds the pin in the activation position of the valve and when electromagnet 33 is energized, it attracts pin 26 and moves it a distance equal to gap 25.
  • the pin is held in the deactivated position of the deactivated valve by permanent magnet 34 which exerts on pin 26 a force greater than the force of the compression spring 31.
  • the rod 11 slides in a housing 19 formed in the cylinder head 12.
  • the stop 7 may also include a body in which the rod 11 slides, the body being able to be attached to the seat. cylinder head or any fixed element that can serve as a support. Thus, the stop becomes an autonomous element that can easily be replaced.
  • the actuators 28 may also include a housing 32 and two pins 26 operable simultaneously.
  • a housing having two pins 26 makes it possible to control the deactivation of two adjacent valves by means of a single command and a single actuator.
  • Figure 7 illustrates the use of an actuator 40 having two pins 26a and 26b simultaneously operable in opposite directions by the same command.
  • Two adjacent valves 1a and 1b are controlled by adjacent cams 9a and 9b via two latches 2a and 2b which also rest on abutments 7a and 7b.
  • An actuator 40 controlling two pins is disposed between the two stops 7a and 7b so that the pins 26a and 26b can slide through the abutments 7a and 7b.
  • a single actuator can control the deactivation of two valves simultaneously.
  • FIG. 8 illustrates a second embodiment of the invention in which the actuating element is a rocker arm 2 'supported by a first end 4' on the valve and by a second end 5 'on the cam 9 by the intermediate of a roll.
  • the rocker arm 2 ' is pivotally mounted, substantially in the middle, on a head 41 of the rod 11 of a stop 7.
  • the rocker arm 2 ' is articulated about an axis 42 carried by a stop 7 identical to the stop 7 described in the first embodiment, this stop 7 thus serving as a fixed point.
  • the stop 7 can be locked in an activation position in which the head 41 of the rod 11 behaves as a fixed point, thus allowing the rocker 2 'to transmit a movement of the cam 9 at valve 1 and a position of deactivation in which the rod is free to move relative to the support 12, thereby interrupting the transmission of a movement between the cam 9 and the valve 1.
  • the device according to the invention can thus be adapted for a so-called "overhead camshaft” valve control.
  • FIG. 9 illustrates a third embodiment of the device according to the invention.
  • the device comprises a rod 11 sliding in a cylindrical housing 19, the rod 11 being guided by hydraulic guides 45 disposed in the cylindrical housing 19.
  • a locking device 25 'selectively blocks the sliding of the rod 11.
  • This locking device 25 comprises a rotary latch 50 comprising a stator 51 secured to the support 12 and a rotor 52 connected to the rod 11, to block the translation of the rod 11 relative to the support 12.
  • the rotor 52 can be moved in two positions: an activation position in which the rotor 52 bears on an intermediate stop 53 and a deactivated position in which the rotor 52 is offset relative to the intermediate support 53, the rod 1 1 being then free to slide between an upper stop 54 formed in the support 12 and the bottom 55 of the cylindrical housing 19.
  • FIG. 10 illustrates a section of the device and in particular an example of a rotary latch in which the stator 51 comprises a first pole 57 corresponding to the activated position and a second pole corresponding to the deactivated position.
  • Each pole 57, 58 comprises two electromagnets respectively, designated 57a, 57b and 58a, 58b, selectively energized, the electromagnets being disposed on the stator 51 to be diametrically opposed.
  • the stator 51 further comprises the intermediate support 53 which comprises two studs 53a and 53b, each facing an electromagnet of the same pole, and more precisely facing the first pole 57 corresponding to the activated position.
  • the rotor comprises a bar 60 provided at each end of a permanent magnet 61 and 62.
  • the bar 60 moves in the axis formed by the electromagnets of the first pole 57 and is placed in abutment on the intermediate support 53.
  • the rod 11, linked to the rotor 52, is then locked in translation by said intermediate support 53.
  • the bar By feeding the second pole 58, corresponding to the deactivated position, the bar moves in the axis formed by the electromagnets of the second pole 58.
  • the rotor 52 is no longer opposite the intermediate support 53, which allows the rod 11 to slide freely in its cylindrical housing 19.
  • 11 illustrates an alternative embodiment of the locking means in which the pin 26 cooperates with a circular groove 27 'formed in the rod 11 to block the sliding. Indeed, it is easier to achieve a circular groove 27 'in the cylindrical rod 11 by turning an opening 27. In addition, unlike the opening 27, it is not necessary to index the groove 27 circular to the pin 26 to ensure their cooperation.
  • the device according to the invention may comprise means of catching play such as means of catching hydraulic play.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The present invention relates to the field of control of an internal combustion engine and, in particular, the disconnection of the inlet and exhaust valves of an internal combustion engine, for example of the controlled-ignition type. The invention proposes a device for actuating at least one valve comprising a support (12) and at least one actuating element (2) which is mounted so that it can pivot and/or slide with respect to the support (12) and rests via a first bearing surface (4) on the valve and via a second bearing surface (5) on a stop (7), characterized in that the stop (7) comprises: - a rod (11) mounted to slide with respect to the support (12) and provided with a top (22) in contact with the actuating element (2); - a spring (18) that presses the rod (11) onto the actuating element (2), and; - locking means (28, 26) for locking the rod (11) in position with respect to the support (12) and actuated by an electromagnetic actuator, the locking means (28, 26) comprising a pin (26) mounted to slide perpendicular to the stop (7) between an activation position in which the pin (26) is housed in a circular groove formed in the rod (11) to block the sliding of the rod, and a deactivation position in which the pin frees the rod so that it can slide.

Description

Dispositif d'actionnement d'au moins une soupape à l'aide d'un actionneur électromagnétiq ue  Device for actuating at least one valve with an electromagnetic actuator
La présente invention concerne le domaine du contrôle d'un moteur à combustion interne et en particulier la déconnexion des soupapes d'admission et d'échappement d'un moteur à combustion interne par exemple à allumage commandé.  The present invention relates to the field of control of an internal combustion engine and in particular the disconnection of the intake and exhaust valves of an internal combustion engine, for example spark ignition.
Un moteur comprend un bloc moteur délimitant des chambres de combustion qui chacune reçoivent un piston mobile et qui est associé à des moyens d'admission d'air et de carburant et à des moyens d'échappement des gaz brûlés. Le rendement des moteurs à combustion interne dépend notamment du taux de remplissage des chambres de combustion par l'air.  An engine comprises an engine block delimiting combustion chambers, each of which receives a movable piston and which is associated with air and fuel intake means and exhaust gas exhaust means. The efficiency of the internal combustion engines depends in particular on the filling rate of the combustion chambers by air.
Afin d'améliorer le rendement des moteurs à combustion, il est préférable de maintenir le moteur dans les zones de fonctionnement dans lesquelles le taux de remplissage est maximum. En effet, dans le cas d'une faible charge du moteur, le système de régulation ne laisse passer que la quantité d'air nécessaire pour assurer la charge moteur. Cela a pour conséquence de mettre le moteur en pompage et de dégrader le rendement du moteur. Pour étendre la zone de fonctionnement optimal notamment lorsque le moteur fonctionne à mi-charge, il est connu de désactiver la moitié des chambres de combustion de manière à augmenter la charge unitaire des chambres de combustion restant activées.  In order to improve the efficiency of the combustion engines, it is preferable to maintain the engine in the operating zones in which the filling ratio is maximum. Indeed, in the case of a low engine load, the control system passes only the amount of air needed to ensure the engine load. This has the effect of pumping the engine and degrading engine performance. To extend the optimal operating zone especially when the engine is running at half load, it is known to deactivate half of the combustion chambers so as to increase the unit load of the combustion chambers remaining activated.
La désactivation des chambres de combustion est obtenue par la neutralisation de l'ouverture des soupapes d'admission et d'échappement desdites chambres.  The deactivation of the combustion chambers is obtained by neutralizing the opening of the intake and exhaust valves of said chambers.
Pour cela, il est connu dans les moteurs à arbres à cames en tête d'utiliser un dispositif de déconnexion de soupape comme décrit par le document US2002/0014217 et illustré en figure 1. Un tel dispositif se compose d'une soupape 1, représentée partiellement, coulissante dans la culasse et maintenue en position stable fermée par un ressort de rappel. La soupape 1 permet d'obturer un trou d'admission alimentant en air un cylindre situé sous la soupape 1. La tête 3 de la soupape 1 est en contact avec une première extrémité 4 d'un élément d'actionnement, ici un linguet 2. Une seconde extrémité 5 du linguet 2, comportant une portée concave hémisphérique, repose sur une tête hémisphérique 6 d'une butée 7. Le linguet 2, sur lequel appuie une came 9 de l'arbre à cames, pivote sur un arbre 8 lui-même coulissant par rapport à la culasse 12. La butée 7 est insérée dans un logement cylindrique dans la culasse 12 et comporte un corps 10 dans lequel coulisse une tige 11 sur laquelle est fixée la tête hémisphérique 6. Un ressort de compression est disposé entre le corps 10 et la tige 11 et permet de maintenir le contact entre la tête hémisphérique 6 et le linguet 2. La butée 7 comporte enfin un verrou 13 qui permet d'immobiliser la tige 11 dans le corps 10 et qui comprend deux doigts 16 diamétralement opposés et écartés par un ressort. For this, it is known in the overhead cam motors to use a valve disconnection device as described in US2002 / 0014217 and illustrated in FIG. 1. Such a device consists of a valve 1, shown partially sliding in the cylinder head and kept in a stable position closed by a return spring. The valve 1 makes it possible to close an intake hole supplying air to a cylinder situated under the valve 1. The head 3 of the valve 1 is in contact with a first end 4 of an actuating element, here a pawl 2 A second end 5 of the pawl 2, having a hemispherical concave bearing, rests on a hemispherical head 6 of an abutment 7. The pawl 2, on which a camshaft cam 9 bears, pivots on a shaft 8. The stop 7 is inserted into a cylindrical housing in the cylinder head 12 and comprises a body 10 in which a rod 11 slides on which is fixed the hemispherical head 6. A compression spring is disposed between the body 10 and the rod 11 and maintains the contact between the hemispherical head 6 and the pawl 2. The stop 7 comprises finally a latch 13 which immobilizes the rod 11 in the body 10 and which comprises two fingers 16 diametrically opposed and spaced by a spring.
En fonctionnement habituel, c'est à dire lorsque la soupape 1 est actionnée par la came et que le cylindre correspondant est actif, le verrou 13 est en position d'activation et les deux doigts 16 sont engagés dans des logements 14, immobilisant la tige 11 par rapport au corps 10. La butée 7 se comporte alors comme un appui fixe sur lequel vient pivoter le linguet 2. La seconde extrémité 5 du linguet 2 étant en appui sur la butée 7 fixe, la première extrémité 4 va, sous l'effet de la came 9, actionner la soupape 1.  In usual operation, that is to say when the valve 1 is actuated by the cam and the corresponding cylinder is active, the latch 13 is in the activation position and the two fingers 16 are engaged in housings 14, immobilizing the rod 11 against the body 10. The abutment 7 then behaves as a fixed support on which pivots the pawl 2. The second end 5 of the pawl 2 bears against the fixed stop 7, the first end 4 goes, under the effect of cam 9, actuate valve 1.
Pour déconnecter la soupape 1 de la came 9, on désactive le verrou 13 en alimentant un circuit hydraulique 15 dont le fluide va appuyer sur les doigts 16 du verrou 13 et les rapprocher. Les doigts 16 quittent alors leur logement 14 et sous les efforts exercés par le linguet 2 sur la butée 7, la tige 11 va coulisser dans le corps 10 et allonger le ressort 18. La butée 7 est dite déverrouillée comme représenté sur la figure 1 qui illustre le verrou 13 dans sa position de désactivation de la soupape. Le linguet 2 se trouve donc en appui d'une part sur la soupape 1 et d'autre part sur la tête 6 de la butée 7. Le ressort 18 de la butée 7 étant plus souple que le ressort de rappel de la soupape 1, c'est la seconde extrémité 5 du linguet 1 qui va osciller, empêchant la came 9 de transmettre son mouvement à la soupape 1. La tête hémisphérique 6 est ainsi animée d'un mouvement alternatif entre une position haute correspondant à la position haute de la came 9 et une position basse correspondant à la position basse de la came 9. La soupape 1 reste fermée et le cylindre correspondant est ainsi désactivé.  To disconnect the valve 1 of the cam 9, the latch 13 is deactivated by feeding a hydraulic circuit 15 whose fluid will press the fingers 16 of the latch 13 and bring them closer together. The fingers 16 then leave their housing 14 and under the forces exerted by the latch 2 on the stop 7, the rod 11 will slide in the body 10 and lengthen the spring 18. The stop 7 is said to be unlocked as shown in FIG. illustrates the latch 13 in its disabling position of the valve. The pawl 2 is therefore supported on the one hand on the valve 1 and on the other hand on the head 6 of the abutment 7. The spring 18 of the abutment 7 being more flexible than the return spring of the valve 1, it is the second end 5 of the pawl 1 which will oscillate, preventing the cam 9 from transmitting its movement to the valve 1. The hemispherical head 6 is thus reciprocated between a high position corresponding to the upper position of the cam 9 and a low position corresponding to the low position of the cam 9. The valve 1 remains closed and the corresponding cylinder is thus deactivated.
Pour verrouiller la butée 7, on cesse d'alimenter le circuit hydraulique 15, ce qui permet aux doigts 16 de s'engager automatiquement dans les logements 14 lors de la remontée de la tige 11 dans le corps 10, immobilisant la tige 11.  To lock the abutment 7, it stops feeding the hydraulic circuit 15, which allows the fingers 16 to engage automatically in the housing 14 during the ascent of the rod 11 in the body 10, immobilizing the rod 11.
Ce dispositif de déconnexion des soupapes est toutefois difficile à mettre en œuvre car la mise en œuvre de circuits hydrauliques est relativement complexe et coûteuse. De plus, ce type de système offre des temps de réponse trop longs pour pouvoir établir des stratégies de gestion moteur optimales.  This valve disconnection device is however difficult to implement because the implementation of hydraulic circuits is relatively complex and expensive. In addition, this type of system offers response times too long to be able to establish optimal engine management strategies.
Le dispositif décrit par le document US2002/0014217 comporte en outre des moyens hydrauliques de rattrapage de jeux 53 disposés dans la tête hémisphérique et qui permettent de compenser les jeux de fonctionnement et d'usure du dispositif. Ces moyens de rattrapage de jeux sont connus de l'homme du métier et ne seront donc pas détaillés plus en avant.  The device described by the document US2002 / 0014217 further comprises hydraulic means for catching up games 53 disposed in the hemispherical head and which make it possible to compensate for the operating and wear gaps of the device. These means of catching games are known to those skilled in the art and will not be detailed further.
Les demandes DE 100 48 620, DE 197 30 814 et DE 44 42 965 enseignent de verrouiller une tige de butée hydraulique par la coopération entre une goupille d'un actionneur et un trou ménagé dans la tige de la butée. Ces demandes ne divulguent aucune coopération entre une gorge circulaire ménagée dans la tige et la goupille. Applications DE 100 48 620, DE 197 30 814 and DE 44 42 965 teach to lock a hydraulic stop pin by the cooperation between a pin of a actuator and a hole in the stopper rod. These requests disclose no cooperation between a circular groove in the rod and the pin.
L'invention vise à proposer un dispositif d'actionnement des soupapes d'un moteur à combustion permettant de remédier au moins en partie à ces inconvénients  The aim of the invention is to propose a device for actuating the valves of a combustion engine making it possible to remedy at least in part these disadvantages.
En vue de la réalisation de ce but, on propose, selon l'invention, un dispositif d'actionnement d'au moins une soupape comportant un support et au moins un élément d'actionnement qui est monté pivotant et/ou coulissant par rapport au support et qui repose par un premier appui sur la soupape et par un deuxième appui sur une butée, caractérisé en ce que la butée comporte :  In order to achieve this object, it is proposed, according to the invention, a device for actuating at least one valve comprising a support and at least one actuating element which is pivotally mounted and / or sliding relative to the support and which rests by a first pressing on the valve and by a second support on a stop, characterized in that the stop comprises:
- une tige montée pour coulisser par rapport au support et pourvue d'un sommet en contact avec l'élément d'actionnement ;  a rod mounted to slide relative to the support and provided with an apex in contact with the actuating element;
un ressort d'appui de la tige sur l'élément d'actionnement et ; des moyens de verrouillage de la tige en position par rapport au support actionnés par un actionneur électromagnétique, les moyens de verrouillage comportant une goupille montée pour coulisser perpendiculairement à la butée entre une position d'activation dans laquelle la goupille est reçue dans une gorge circulaire ménagée dans la tige pour bloquer le coulissement de la tige et une position de désactivation dans laquelle la goupille libère le coulissement de la tige.  a bearing spring of the rod on the actuating element and; locking means of the rod in position relative to the support actuated by an electromagnetic actuator, the locking means comprising a pin mounted to slide perpendicularly to the stop between an activation position in which the pin is received in a circular groove arranged in the rod to block the sliding of the rod and a deactivation position in which the pin releases the sliding of the rod.
Les actionneurs électromagnétiques ne nécessitent pas de circuits hydrauliques et ont des temps de transition plus courts, ce qui autorise l'utilisation de stratégies de pilotage plus complexes.  Electromagnetic actuators do not require hydraulic circuits and have shorter transition times, which allows the use of more complex control strategies.
Avantageusement, les moyens de verrouillage comportent une goupille montée pour coulisser perpendiculairement à la butée entre une position d'activation dans laquelle la goupille est reçue dans une ouverture ménagée dans la tige pour bloquer le coulissement de la tige et une position de désactivation dans laquelle la goupille libère le coulissement de la tige.  Advantageously, the locking means comprise a pin mounted to slide perpendicular to the stop between an activation position in which the pin is received in an opening in the rod to block the sliding of the rod and a deactivation position in which the pin releases the sliding of the rod.
Avantageusement, la goupille comporte une extrémité biseautée en contact avec la tige.  Advantageously, the pin has a beveled end in contact with the rod.
L'utilisation d'une goupille dont l'extrémité est biseautée permet un blocage sûr et simple de la butée tout en permettant de rattraper les jeux et usures du dispositif.  The use of a pin whose end is tapered allows a secure and simple blocking of the stop while allowing to catch the games and wear of the device.
L'élément d'actionnement est par exemple un linguet. Le linguet (aussi appelé basculeur) est un levier disposant de deux appuis à ses deux extrémités opposées. Le premier appui repose sur un point fixe, formée par exemple par une butée hydraulique de rattrapage de jeu, et le deuxième appui repose sur la tige de soupape. La butée forme par exemple pour le linguet un point fixe. La butée est notamment une butée hydraulique. The actuating element is for example a pawl. The pawl (also called rocker) is a lever with two supports at its two opposite ends. The first support is based on a fixed point, formed for example by a hydraulic play retraction stop, and the second support rests on the valve stem. The stop forms for example for the latch a fixed point. The stop is in particular a hydraulic stop.
Une came vient par exemple en appui sur le linguet via une région intermédiaire du linguet, cette région intermédiaire étant disposée entre les deux extrémités du linguet.  A cam comes for example to bear on the pawl via an intermediate region of the pawl, this intermediate region being disposed between the two ends of the pawl.
La tige peut s'étendre selon un axe longitudinal et la gorge annulaire peut être disposée autour de cet axe longitudinal.  The rod may extend along a longitudinal axis and the annular groove may be arranged around this longitudinal axis.
Les moyens de verrouillage peuvent être configurés pour ne verrouiller la tige qu'à une seule hauteur dans le support, cette hauteur correspondant à la direction de l'axe longitudinal de la tige, contrairement par exemple aux moyens de verrouillage divulgués dans le brevet US 5 875 748 qui permettent un verrouillage de la tige à deux hauteurs différentes dans le support.  The locking means may be configured to lock the rod at a single height in the support, this height corresponding to the direction of the longitudinal axis of the rod, unlike for example the locking means disclosed in the US patent 5 875 748 which allow locking of the rod at two different heights in the support.
L'actionneur électromagnétique peut être exclusivement électromagnétique, c'est-à- dire que le déplacement de la goupille n'est dû qu'à une force magnétique. L'actionneur électromagnétique est par exemple différent d'un actionneur mettant en œuvre à la fois des moyens hydrauliques et des moyens magnétiques, comme par exemple décrit dans la demande FR 2 512 493 dans laquelle une vanne est actionnée électromagnétiquement pour permettre à un fluide de déplacer un verrou.  The electromagnetic actuator may be exclusively electromagnetic, that is to say that the displacement of the pin is only due to a magnetic force. The electromagnetic actuator is for example different from an actuator implementing both hydraulic means and magnetic means, as for example described in application FR 2 512 493 in which a valve is electromagnetically actuated to allow a fluid to flow. move a lock.
L'actionneur est de préférence un actionneur linéaire.  The actuator is preferably a linear actuator.
La goupille peut être formée par plusieurs pièces rigidement couplées entre elles, par exemple par frettage ou vissage.  The pin may be formed by several pieces rigidly coupled together, for example by hooping or screwing.
La goupille peut comprendre une première pièce réalisée dans un matériau ferromagnétique et soumise au champ magnétique généré par l'actionneur, notamment des électro-aimants dans l'actionneur. Cette première pièce est par exemple plongée à l'intérieur de l'actionneur et notamment entourée par les électro-aimants. La goupille peut comprendre une deuxième pièce venant verrouiller la tige en coopérant avec la gorge circulaire ménagée dans celle-ci. Cette deuxième pièce peut être réalisée dans un matériau différent de celui utilisé pour la première pièce. La deuxième pièce est avantageusement réalisée en un matériau permettant d'assurer la tenue aux efforts de verrouillage.  The pin may comprise a first part made of a ferromagnetic material and subjected to the magnetic field generated by the actuator, in particular electromagnets in the actuator. This first piece is for example immersed inside the actuator and in particular surrounded by the electromagnets. The pin may comprise a second piece which locks the rod by cooperating with the circular groove formed therein. This second piece may be made of a material different from that used for the first piece. The second part is advantageously made of a material that makes it possible to withstand the locking forces.
La première et la deuxième pièce peuvent être déplacées toutes deux selon un même mouvement de translation par le champ magnétique généré par l'actionneur. Cette première et cette deuxième pièces peuvent être solidaires. La première pièce de la goupille et la deuxième pièce de la goupille ci-dessus peuvent ne présenter aucun degré de liberté entre elles.  The first and second parts can both be moved in the same translational movement by the magnetic field generated by the actuator. This first and second pieces can be interdependent. The first piece of the pin and the second piece of the pin above may have no degree of freedom between them.
D'autres caractéristiques figurent dans les revendications dépendantes. L'invention pourra être mieux comprise à la lecture de la description qui va suivre d'un mode de réalisation particulier non limitatif de celle-ci. Other features are in the dependent claims. The invention can be better understood on reading the following description of a particular non-limiting embodiment of the latter.
Il sera fait référence aux dessins annexés donnés à titre d'exemple non limitatif, parmi lesquels :  Reference will be made to the accompanying drawings given by way of non-limiting example, among which:
- la figure 1 est une vue en coupe latérale d'un dispositif d'actionnement de soupape selon l'art antérieur ;  - Figure 1 is a side sectional view of a valve actuating device according to the prior art;
- la figure 2 est une vue schématique partielle en coupe transversale d'un dispositif d'actionnement de soupape selon un premier mode de réalisation de l'invention ;  FIG. 2 is a partial schematic cross-sectional view of a valve actuating device according to a first embodiment of the invention;
- la figure 3 est une vue schématique agrandie d'une partie du dispositif d'actionnement illustré en figure 2 et représentant un premier mode de réalisation d'un dispositif de verrouillage selon l'invention ;  FIG. 3 is an enlarged schematic view of a portion of the actuating device illustrated in FIG. 2 and showing a first embodiment of a locking device according to the invention;
- la figure 4 est une vue schématique en coupe transversale d'un premier actionneur utilisé dans un dispositif de verrouillage illustré en figure 3 et du type stable en position connectée ;  FIG. 4 is a diagrammatic cross-sectional view of a first actuator used in a locking device illustrated in FIG. 3 and of the stable type in the connected position;
- la figure 5 est une vue schématique en coupe transversale d'un second actionneur utilisé dans un dispositif de verrouillage illustré en figure 3 et du type stable en position déconnectée ;  FIG. 5 is a diagrammatic cross-sectional view of a second actuator used in a locking device illustrated in FIG. 3 and of the stable type in the disconnected position;
- la figure 6 est une vue schématique en coupe transversale d'un troisième actionneur utilisé dans un dispositif de verrouillage illustré en figure 3 et du type bistable ;  FIG. 6 is a diagrammatic cross-sectional view of a third actuator used in a locking device illustrated in FIG. 3 and of the bistable type;
- la figure 7 est une vue schématique en perspective de deux soupapes adjacentes et de leurs dispositifs de verrouillage respectifs ;  - Figure 7 is a schematic perspective view of two adjacent valves and their respective locking devices;
- la figure 8 est une vue schématique partielle en coupe transversale d'un dispositif d'actionnement de soupape selon un deuxième mode de réalisation de l'invention ;  FIG. 8 is a partial schematic cross-sectional view of a valve actuating device according to a second embodiment of the invention;
- la figure 9 est une vue schématique partielle en coupe transversale d'un dispositif d'actionnement de soupape selon un troisième mode de réalisation de l'invention ;  FIG. 9 is a partial schematic cross-sectional view of a valve actuating device according to a third embodiment of the invention;
- la figure 10 est une vue en coupe partielle d'un moyen de verrouillage correspondant au troisième mode de réalisation de l'invention ;  - Figure 10 is a partial sectional view of a locking means corresponding to the third embodiment of the invention;
- la figure 11 est une vue schématique agrandie d'une partie du dispositif d'actionnement illustré en figure 2 et représentant un deuxième mode de réalisation d'un dispositif de verrouillage selon l'invention.  - Figure 11 is an enlarged schematic view of a portion of the actuating device illustrated in Figure 2 and showing a second embodiment of a locking device according to the invention.
L'idée à la base de l'invention est de réaliser une butée pouvant être verrouillée et déverrouillée grâce à un actionneur électromécanique. The idea underlying the invention is to provide a stop that can be locked and unlocked thanks to an electromechanical actuator.
La figure 2 illustre un exemple de réalisation de cette invention. La butée 7 comporte une tige 11, cylindrique, qui coulisse dans un logement cylindrique 19 ménagé dans la culasse 12 suivant un axe vertical. Un arrêt en rotation 21 permet de ne conserver qu'un mouvement de translation entre la tige 1 1 et le logement 19 et d'assurer la position de connexion et de déconnexion du logement 27 avec la goupille 26. Un ressort de rappel 18 est placé entre le fond du logement 19 et une base 23 de la tige 11 correspondant à son extrémité inférieure. La tige 11 comporte également un sommet 22 sur lequel s'appuie une seconde extrémité 5 de l'élément d'actionnement, ici un linguet 2. La première extrémité 4 du linguet 2 est en appui sur la tête de soupape 1 qui est ici simplement schématisée.  Figure 2 illustrates an exemplary embodiment of this invention. The abutment 7 comprises a rod 11, cylindrical, which slides in a cylindrical housing 19 formed in the yoke 12 along a vertical axis. A rotational stop 21 makes it possible to maintain only a translational movement between the rod 1 1 and the housing 19 and to ensure the position of connection and disconnection of the housing 27 with the pin 26. A return spring 18 is placed between the bottom of the housing 19 and a base 23 of the rod 11 corresponding to its lower end. The rod 11 also has a top 22 on which a second end 5 of the actuating element rests, here a pawl 2. The first end 4 of the pawl 2 bears on the valve head 1 which is simply here schematically.
La butée 7 comporte un dispositif de verrouillage 25 comprenant une goupille 26 cylindrique qui coulisse au travers de la culasse 12 et du logement 19 de la butée 7 selon un axe perpendiculaire à l'axe vertical. La goupille 26 vient se loger dans une ouverture cylindrique 27 ménagée dans la tige 11 et apte à recevoir ladite goupille 26. Le dispositif de verrouillage 25 comprend également un actionneur 28 électromécanique qui permet de déplacer la goupille 26 entre deux positions stables :  The abutment 7 comprises a locking device 25 comprising a cylindrical pin 26 which slides through the yoke 12 and the housing 19 of the abutment 7 along an axis perpendicular to the vertical axis. The pin 26 is housed in a cylindrical opening 27 formed in the rod 11 and adapted to receive said pin 26. The locking device 25 also comprises an electromechanical actuator 28 which moves the pin 26 between two stable positions:
- une position de désactivation de la soupape dans laquelle la goupille 26 est rentrée dans l'actionneur 28, permettant ainsi à la tige de coulisser dans son logement, et - une position d'activation de la soupape dans laquelle la goupille 26 est introduite dans l'ouverture 27 de la tige 11, bloquant la translation de la tige 11 par rapport à la culasse 12.  a valve deactivation position in which the pin 26 is retracted into the actuator 28, thus allowing the rod to slide in its housing, and an activation position of the valve in which the pin 26 is inserted into the opening 27 of the rod 11, blocking the translation of the rod 11 relative to the yoke 12.
L'actionneur 28 exerce par ailleurs un effort permanent sur la goupille tant quelle n'a pas atteint la position connectée.  The actuator 28 also exerts a permanent force on the pin as it has not reached the connected position.
Lorsque la goupille 26 est en position d'activation, la tige 11 est immobilisée et le sommet 22 se comporte comme un point fixe. La seconde extrémité 5 du linguet 2 pivote sur le sommet 22 et la came 9 transmet son mouvement à la soupape 1.  When the pin 26 is in the activation position, the rod 11 is immobilized and the top 22 behaves as a fixed point. The second end 5 of the pawl 2 pivots on the top 22 and the cam 9 transmits its movement to the valve 1.
Lorsque la goupille 26 est en position de désactivation, la tige 11 coulisse librement dans le logement 19, le ressort de rappel 18 maintenant le contact entre le sommet 22 et l'extrémité 4 du linguet 2 et s'opposant à l'action de l'extrémité 4 du linguet 2. Le ressort de rappel 18 étant plus souple que le ressort de maintien de la soupape 1 , la came 9 transmet son mouvement à la tige 11 et non à la soupape 1. La tige 11 suit le mouvement de la seconde extrémité 5 du linguet 2 et le sommet 22 adopte une trajectoire passant par un point haut correspondant au point haut de la came 9 et un point bas correspondant au point bas de la came 9. La soupape 1 n'étant plus actionnée, elle reste fermée et le cylindre correspondant est désactivé. When the pin 26 is in the deactivated position, the rod 11 slides freely in the housing 19, the return spring 18 maintaining contact between the top 22 and the end 4 of the pawl 2 and opposing the action of the end 4 of the pawl 2. The return spring 18 being more flexible than the holding spring of the valve 1, the cam 9 transmits its movement to the rod 11 and not to the valve 1. The rod 11 follows the movement of the second end 5 of the latch 2 and the top 22 adopts a path passing through a high point corresponding to the high point of the cam 9 and a low point corresponding to the low point of the cam 9. The valve 1 is no longer actuated, it remains closed and the corresponding cylinder is deactivated.
L'utilisation d'un actionneur électromécanique rapporté sur la butée permet de simplifier le système. Ainsi, la butée ne comporte plus de circuit hydraulique ni de parties mobiles internes à la tige. L'utilisation d'un actionneur électromécanique permet une meilleure réactivité du dispositif et permet également d'utiliser des stratégies complexes de commande du moteur. De plus, l'actionneur pouvant être rapporté sur la butée, son changement est aisé.  The use of an electromechanical actuator attached to the abutment simplifies the system. Thus, the abutment no longer includes a hydraulic circuit or moving parts internal to the rod. The use of an electromechanical actuator allows a better responsiveness of the device and also allows the use of complex engine control strategies. In addition, the actuator can be attached to the stop, its change is easy.
La figure 3 illustre un détail du dispositif d'actionnement de soupape selon un mode de réalisation particulier de l'invention. La figure 3 illustre une extrémité 30 prolongeant le corps de la goupille 26 partiellement engagée dans l'ouverture 27 de la tige 1 1. L'extrémité 30 de la goupille 26 est biseautée de façon à présenter un angle a avec un plan perpendiculaire à l'axe vertical de la butée 7. Un bord supérieur 29 de l'ouverture 27 de la tige 11 repose sur l'extrémité 30 de la goupille. L'angle a est compris entre 5° et 20° afin que, lorsque la tige 11 repose sur la goupille 26, cette dernière soit bloquée en position. Dans ce mode de réalisation particulier, le corps de la goupille comporte une section supérieure à la section de passage de l'ouverture 27 de façon que seule une partie de l'extrémité biseautée 30 de la goupille 26 puisse être introduite dans l'ouverture 27.  Figure 3 illustrates a detail of the valve actuator according to a particular embodiment of the invention. 3 illustrates an end 30 extending the body of the pin 26 partially engaged in the opening 27 of the rod 1 1. The end 30 of the pin 26 is bevelled so as to have an angle with a plane perpendicular to the vertical axis of the abutment 7. An upper edge 29 of the opening 27 of the rod 11 rests on the end 30 of the pin. The angle a is between 5 ° and 20 ° so that when the rod 11 rests on the pin 26, the latter is locked in position. In this particular embodiment, the body of the pin has a section greater than the passage section of the opening 27 so that only a portion of the tapered end 30 of the pin 26 can be introduced into the opening 27 .
Le biseau de l'extrémité 30 de la goupille 26 permet de faciliter l'engagement de la goupille 26 dans l'ouverture 27, de maintenir la goupille 26 en position et de rattraper les jeux du dispositif.  The bevel of the end 30 of the pin 26 facilitates the engagement of the pin 26 in the opening 27, keep the pin 26 in position and catch the games of the device.
En effet, les tolérances de fabrication et de montage, l'usure en fonctionnement et la dilatation des pièces en fonctionnement entraînent une dispersion de la position du sommet 22 de la tige 11 pouvant entraîner une désynchronisation du mouvement de la soupape 1 par rapport à la came 9.  Indeed, the manufacturing and assembly tolerances, the wear in operation and the expansion of the parts in operation cause a dispersion of the position of the top 22 of the rod 11 may cause desynchronization of the movement of the valve 1 relative to the cam 9.
En partant d'une position dans laquelle la soupape 1 est déconnectée de la came 9, la goupille 26 est en position de désactivation, la tige 11 étant engagée dans son logement 19 et le ressort de rappel 18 étant comprimé, on décide de bloquer à nouveau la butée 7 pour reconnecter la soupape 1. La goupille 26 est premièrement libérée et vient en appui sur la tige 11 car l'actionneur 28 maintient un effort sur la goupille 26 tant qu'elle n'est pas en position d'activation de la soupape. Dans le même temps, la tige 11 suit le mouvement du linguet 2 et de la came 9 et entame sa remontée jusqu'à ce que l'ouverture 27 soit en face de la goupille 26. La goupille 26 va alors s'engager dans l'ouverture 27 jusqu'à ce que l'extrémité biseautée 30 entre en contact avec le bord supérieur 29 de l'ouverture 27, ce qui bloque la progression de la goupille 26. La tige 11 continue son mouvement jusqu'à ce que le sommet 22 de la tige 11 atteigne le point haut de sa trajectoire, défini par le mouvement de la came 9. A cet instant, la goupille 26 est engagée au maximum dans l'ouverture 27 et la tige 11 est immobilisée. La position de verrouillage de la tige 11 correspond au point haut de la came 9, ce qui garantit que, quelle que soit l'usure de la goupille 26, du sommet 22 de la tige 11 ou de la seconde extrémité 5 du linguet 2, le point fixe défini par le sommet 22 de la tige 11 sera toujours dans la même position. Starting from a position in which the valve 1 is disconnected from the cam 9, the pin 26 is in the deactivated position, the rod 11 being engaged in its housing 19 and the return spring 18 being compressed, it is decided to block at again the stop 7 to reconnect the valve 1. The pin 26 is first released and bears on the rod 11 because the actuator 28 maintains a force on the pin 26 until it is in the activation position of the valve. At the same time, the rod 11 follows the movement of the pawl 2 and the cam 9 and begins its ascent until the opening 27 is in front of the pin 26. The pin 26 will then engage in the opening 27 until the tapered end 30 contacts the upper edge 29 of the opening 27, which blocks the progression of the pin 26. The rod 11 continues its movement until the top 22 of the rod 11 reaches the high point of its trajectory, defined by the movement of the cam 9. At this moment, the pin 26 is engaged at the maximum in the opening 27 and the rod 11 is immobilized. The locking position of the rod 11 corresponds to the high point of the cam 9, which ensures that, whatever the wear of the pin 26, the top 22 of the rod 11 or the second end 5 of the pawl 2, the fixed point defined by the top 22 of the rod 11 will always be in the same position.
La figure 4 illustre un premier type d'actionneur 28 du type stable en position activée. L'actionneur 28 comporte un boîtier 32, une goupille 26 coulissante dans le boîtier 32 et un ressort de compression 31 qui exerce un effort permanent sur la goupille 26 et la maintient en position d'activation de la soupape. L'actionneur 28 comporte également un électroaimant 33 et un noyau 34 espacé de la goupille 26 par un entrefer 25. Lorsque Γ électroaimant 33 n'est pas alimenté, le ressort de compression 31 maintient la goupille en position d'activation de la soupape et lorsque électroaimant 33 est alimenté, il attire la goupille 26 et la déplace d'une distance égale à l'entrefer 25 pour la placer en position de désactivation de la soupape. Sans alimentation, l'actionneur 28 est stable en position d'activation de la soupape.  FIG. 4 illustrates a first type of actuator 28 of the stable type in the activated position. The actuator 28 comprises a housing 32, a pin 26 sliding in the housing 32 and a compression spring 31 which exerts a permanent force on the pin 26 and keeps it in the activation position of the valve. The actuator 28 also comprises an electromagnet 33 and a core 34 spaced from the pin 26 by an air gap 25. When Γ electromagnet 33 is not powered, the compression spring 31 holds the pin in the activation position of the valve and when electromagnet 33 is energized, it attracts pin 26 and moves it a distance equal to gap 25 to place it in the deactivated position of the valve. Without power, the actuator 28 is stable in the activation position of the valve.
La figure 5 illustre un second type d'actionneur 28 du type stable en position de désactivation de la soupape. Ce second actionneur 28 est similaire au premier actionneur décrit en figure 4 mais ici, le ressort de compression est disposé de façon à maintenir la goupille 26 en position de désactivation de la soupape lorsque Γ électroaimant n'est pas alimenté.  FIG. 5 illustrates a second type of actuator 28 of the stable type in the deactivated position of the valve. This second actuator 28 is similar to the first actuator described in FIG. 4, but here the compression spring is arranged to hold the pin 26 in the deactivated position of the valve when the electromagnet is not energized.
La figure 6 illustre un troisième type d'actionneur bistable sans courant comportant un boîtier 32, une goupille 26 coulissante dans le boîtier 32 et un ressort de compression 31 qui exerce un effort permanent sur la goupille 26 et la maintient en position d'activation de la soupape. L'actionneur 28 comporte également un électroaimant 33 et un aimant permanent 34 espacé de la goupille 26 par un entrefer 25. Lorsque Γ électroaimant 33 n'est pas alimenté, le ressort de compression 31 maintient la goupille en position d'activation de la soupape et lorsque électroaimant 33 est alimenté, il attire la goupille 26 et la déplace d'une distance égale à l'entrefer 25. La goupille est maintenue en position de désactivation de la soupape désactivée par l'aimant permanent 34 qui exerce sur la goupille 26 un effort supérieur à l'effort du ressort de compression 31. Pour déplacer la goupille en position d'activation de la soupape, on inverse la polarité de Γ électroaimant afin d'annuler l'attraction de l'aimant permanent 34. Le ressort de compression 31 déplace alors la goupille 26 en position d'activation de la soupape. L'entrefer 25 est suffisant pour que l'attraction de l'aimant permanent 34 soit inférieure à l'effort du ressort de compression 31. Cette solution présente l'avantage d'une faible consommation lorsque la goupille est longtemps maintenue en position déconnectée : le courant de maintien étant nul dans cette configuration grâce à l'aimant permanent 34. FIG. 6 illustrates a third type of non-current bistable actuator comprising a housing 32, a pin 26 sliding in the housing 32 and a compression spring 31 which exerts a permanent force on the pin 26 and keeps it in the activation position of the valve. The actuator 28 also comprises an electromagnet 33 and a permanent magnet 34 spaced from the pin 26 by an air gap 25. When Γ electromagnet 33 is not energized, the compression spring 31 holds the pin in the activation position of the valve and when electromagnet 33 is energized, it attracts pin 26 and moves it a distance equal to gap 25. The pin is held in the deactivated position of the deactivated valve by permanent magnet 34 which exerts on pin 26 a force greater than the force of the compression spring 31. To move the pin in the activation position of the valve, the polarity of the electromagnet is reversed in order to cancel the attraction of the permanent magnet 34. The spring of compression 31 then moves the pin 26 in the activation position of the valve. The gap 25 is sufficient for the attraction of the permanent magnet 34 to be less than the force of the compression spring 31. This solution has the advantage of low consumption when the pin is long held in the disconnected position: the holding current being zero in this configuration thanks to the permanent magnet 34.
Dans l'exemple illustrant un mode de réalisation particulier de l'invention la tige 11 coulisse dans un logement 19 ménagé dans la culasse 12. La butée 7 peut également comporter un corps dans lequel coulisse la tige 11 , le corps pouvant être rapporté sur la culasse ou à tout élément fixe pouvant servir de support. Ainsi, la butée devient un élément autonome pouvant facilement être remplacé.  In the example illustrating a particular embodiment of the invention the rod 11 slides in a housing 19 formed in the cylinder head 12. The stop 7 may also include a body in which the rod 11 slides, the body being able to be attached to the seat. cylinder head or any fixed element that can serve as a support. Thus, the stop becomes an autonomous element that can easily be replaced.
En outre, les actionneurs 28 peuvent également comporter un boîtier 32 et deux goupilles 26 actionnables simultanément. Un boîtier comportant deux goupilles 26 permet de commander la désactivation de deux soupapes adjacentes à l'aide d'une seule commande et d'un seul actionneur. La figure 7 illustre l'utilisation d'un actionneur 40 comportant deux goupilles 26a et 26b actionnables simultanément dans des directions opposées par une même commande. Deux soupapes adjacentes la et lb sont commandées par des cames 9a et 9b adjacentes par l'intermédiaire de deux linguets 2a et 2b qui reposent également sur des butées 7a et 7b. Un actionneur 40 commandant deux goupilles est disposé entre les deux butées 7a et 7b de façon à ce que les goupilles 26a et 26b puissent coulisser au travers des butées 7a et 7b. Ainsi, un seul actionneur peut commander la désactivation de deux soupapes simultanément.  In addition, the actuators 28 may also include a housing 32 and two pins 26 operable simultaneously. A housing having two pins 26 makes it possible to control the deactivation of two adjacent valves by means of a single command and a single actuator. Figure 7 illustrates the use of an actuator 40 having two pins 26a and 26b simultaneously operable in opposite directions by the same command. Two adjacent valves 1a and 1b are controlled by adjacent cams 9a and 9b via two latches 2a and 2b which also rest on abutments 7a and 7b. An actuator 40 controlling two pins is disposed between the two stops 7a and 7b so that the pins 26a and 26b can slide through the abutments 7a and 7b. Thus, a single actuator can control the deactivation of two valves simultaneously.
Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits précédemment, mais inclut également les modes de réalisation et arrangements suivants :  Of course, the invention is not limited to the embodiments described above, but also includes the following embodiments and arrangements:
La figure 8 illustre un deuxième mode de réalisation de l'invention dans lequel l'élément d'actionnement est un culbuteur 2' en appui par une première extrémité 4' sur la soupape et par une deuxième extrémité 5' sur la came 9 par l'intermédiaire d'un rouleau. Le culbuteur 2' est monté pivotant, sensiblement en son milieu, sur une tête 41 de la tige 11 d'une butée 7.  FIG. 8 illustrates a second embodiment of the invention in which the actuating element is a rocker arm 2 'supported by a first end 4' on the valve and by a second end 5 'on the cam 9 by the intermediate of a roll. The rocker arm 2 'is pivotally mounted, substantially in the middle, on a head 41 of the rod 11 of a stop 7.
Dans ce deuxième mode de réalisation, le culbuteur 2' est donc articulé autour d'un axe 42 porté par une butée 7 identique à la butée 7 décrite dans le premier mode de réalisation, cette butée 7 servant ainsi de point fixe. A l'instar du premier mode de réalisation, la butée 7 peut être verrouillée en une position d'activation dans laquelle la tête 41 de la tige 11 se comporte comme un point fixe, permettant ainsi au culbuteur 2' de transmettre un mouvement de la came 9 à la soupape 1 et une position de désactivation dans laquelle la tige est libre de se déplacer par rapport au support 12, interrompant ainsi la transmission d'un mouvement entre la came 9 et la soupape 1. In this second embodiment, the rocker arm 2 'is articulated about an axis 42 carried by a stop 7 identical to the stop 7 described in the first embodiment, this stop 7 thus serving as a fixed point. Like the first embodiment, the stop 7 can be locked in an activation position in which the head 41 of the rod 11 behaves as a fixed point, thus allowing the rocker 2 'to transmit a movement of the cam 9 at valve 1 and a position of deactivation in which the rod is free to move relative to the support 12, thereby interrupting the transmission of a movement between the cam 9 and the valve 1.
Le dispositif selon l'invention peut ainsi être adapté pour une commande de soupape dit « à arbre à cames en tête ».  The device according to the invention can thus be adapted for a so-called "overhead camshaft" valve control.
La figure 9 illustre un troisième mode de réalisation du dispositif selon l'invention. FIG. 9 illustrates a third embodiment of the device according to the invention.
Dans ce troisième mode de réalisation, le dispositif comporte une tige 11 coulissante dans un logement cylindrique 19, la tige 11 étant guidée par des guides hydrauliques 45 disposés dans le logement cylindrique 19. Un dispositif de verrouillage 25' permet de bloquer sélectivement le coulissement de la tige 11. Ce dispositif de verrouillage 25 ' comporte un verrou rotatif 50 comprenant un stator 51 solidaire du support 12 et un rotor 52 lié à la tige 11, permettant de bloquer la translation de la tige 11 par rapport au support 12. Le rotor 52 peut être déplacé selon deux positions : une position d'activation dans laquelle le rotor 52 est en appui sur un arrêt intermédiaire 53 et une position désactivée dans laquelle le rotor 52 est décalé par rapport à l'appui intermédiaire 53, la tige 1 1 étant alors libre de coulisser entre un arrêt supérieur 54 ménagé dans le support 12 et le fond 55 du logement cylindrique 19. In this third embodiment, the device comprises a rod 11 sliding in a cylindrical housing 19, the rod 11 being guided by hydraulic guides 45 disposed in the cylindrical housing 19. A locking device 25 'selectively blocks the sliding of the rod 11. This locking device 25 'comprises a rotary latch 50 comprising a stator 51 secured to the support 12 and a rotor 52 connected to the rod 11, to block the translation of the rod 11 relative to the support 12. The rotor 52 can be moved in two positions: an activation position in which the rotor 52 bears on an intermediate stop 53 and a deactivated position in which the rotor 52 is offset relative to the intermediate support 53, the rod 1 1 being then free to slide between an upper stop 54 formed in the support 12 and the bottom 55 of the cylindrical housing 19.
La figure 10 illustre une coupe du dispositif et en particulier un exemple de verrou rotatif dans lequel le stator 51 comporte un premier pôle 57 correspondant à la position activée et un deuxième pôle correspondant à la position désactivée. Chaque pôle 57, 58 comprend deux électroaimants respectivement, désignés 57a, 57b et 58a, 58b, alimentés sélectivement en courant, les électroaimants étant disposés sur le stator 51 pour être diamétralement opposés.  FIG. 10 illustrates a section of the device and in particular an example of a rotary latch in which the stator 51 comprises a first pole 57 corresponding to the activated position and a second pole corresponding to the deactivated position. Each pole 57, 58 comprises two electromagnets respectively, designated 57a, 57b and 58a, 58b, selectively energized, the electromagnets being disposed on the stator 51 to be diametrically opposed.
Le stator 51 comporte en outre l'appui intermédiaire 53 qui comprend deux plots 53a et 53b répartis chacun face à un électroaimant d'un même pôle, et plus précisément face au premier pôle 57 correspondant à la position activée.  The stator 51 further comprises the intermediate support 53 which comprises two studs 53a and 53b, each facing an electromagnet of the same pole, and more precisely facing the first pole 57 corresponding to the activated position.
Le rotor comporte une barre 60 munie à chaque extrémité d'un aimant permanent 61 et 62.  The rotor comprises a bar 60 provided at each end of a permanent magnet 61 and 62.
Ainsi, en alimentant en courant le premier pôle 57, la barre 60 se déplace dans l'axe formé par les électroaimants du premier pôle 57 et se place en appui sur l'appui intermédiaire 53. La tige 11, liée au rotor 52, est alors bloquée en translation par ledit appui intermédiaire 53.  Thus, by supplying power to the first pole 57, the bar 60 moves in the axis formed by the electromagnets of the first pole 57 and is placed in abutment on the intermediate support 53. The rod 11, linked to the rotor 52, is then locked in translation by said intermediate support 53.
En alimentant le deuxième pôle 58, correspondant à la position désactivée, la barre se déplace dans l'axe formé par les électroaimants du deuxième pôle 58. Le rotor 52 n'est plus en regard de l'appui intermédiaire 53, ce qui permet à la tige 11 de coulisser librement dans son logement cylindrique 19. La figure 11 illustre une variante de réalisation des moyens de verrouillage dans laquelle la goupille 26 coopère avec une gorge circulaire 27' ménagée dans la tige 11 pour en bloquer le coulissement. En effet, il est plus facile de réaliser une gorge circulaire 27' dans la tige 11 cylindrique par tournage qu'une ouverture 27. En outre, au contraire de l'ouverture 27, il n'est pas nécessaire d'indexer la gorge 27' circulaire par rapport à la goupille 26 pour assurer leur coopération. By feeding the second pole 58, corresponding to the deactivated position, the bar moves in the axis formed by the electromagnets of the second pole 58. The rotor 52 is no longer opposite the intermediate support 53, which allows the rod 11 to slide freely in its cylindrical housing 19. 11 illustrates an alternative embodiment of the locking means in which the pin 26 cooperates with a circular groove 27 'formed in the rod 11 to block the sliding. Indeed, it is easier to achieve a circular groove 27 'in the cylindrical rod 11 by turning an opening 27. In addition, unlike the opening 27, it is not necessary to index the groove 27 circular to the pin 26 to ensure their cooperation.
Avantageusement, le dispositif selon l'invention peut comporter des moyens de rattrapage de jeu tels des moyens de rattrapage de jeu hydrauliques.  Advantageously, the device according to the invention may comprise means of catching play such as means of catching hydraulic play.

Claims

REVENDICATIONS
1. Dispositif d'actionnement d'au moins une soupape comportant un support (12) et au moins un élément d'actionnement (2) qui est montée pivotante et/ou coulissante par rapport au support (12) et qui repose par un premier appui (4) sur la soupape et par un deuxième appui (5) sur une butée (7), caractérisé en ce que la butée (7) comporte : 1. Device for actuating at least one valve comprising a support (12) and at least one actuating element (2) which is pivotally mounted and / or sliding relative to the support (12) and which rests by a first support (4) on the valve and by a second support (5) on a stop (7), characterized in that the stop (7) comprises:
une tige (11) montée pour coulisser par rapport au support (12) et pourvue d'un sommet (22) en contact avec l'élément d'actionnement (2) ;  a rod (11) slidably mounted with respect to the support (12) and provided with an apex (22) in contact with the actuating element (2);
- un ressort 18 d'appui de la tige (11) sur l'élément d'actionnement (2) et ;  a spring 18 for supporting the rod (11) on the actuating element (2) and;
des moyens de verrouillage (28, 26) de la tige (11) en position par rapport au support (12) actionnés par un actionneur électromagnétique, les moyens de verrouillage (28, 26) comportant une goupille (26) montée pour coulisser perpendiculairement à la butée (7) entre une position d'activation dans laquelle la goupille (26) est reçue dans une gorge circulaire ménagée dans la tige (11) pour bloquer le coulissement de la tige et une position de désactivation dans laquelle la goupille libère le coulissement de la tige.  locking means (28, 26) of the rod (11) in position relative to the support (12) actuated by an electromagnetic actuator, the locking means (28, 26) comprising a pin (26) mounted to slide perpendicularly to the stop (7) between an activation position in which the pin (26) is received in a circular groove in the rod (11) to block the sliding of the rod and a deactivation position in which the pin releases the slide of the stem.
2. Dispositif selon la revendication 2, dans lequel la goupille (26) comporte une extrémité biseautée (30) en contact avec la tige (11).  2. Device according to claim 2, wherein the pin (26) has a beveled end (30) in contact with the rod (11).
3. Dispositif selon la revendication 2, comportant deux éléments d'actionnement (2) associés chacun à une butée (7), l'actionneur (28) étant agencé pour actionner simultanément une goupille (26a, 26b) pour chaque butée (7).  3. Device according to claim 2, comprising two actuating elements (2) each associated with a stop (7), the actuator (28) being arranged to simultaneously actuate a pin (26a, 26b) for each stop (7). .
4. Dispositif selon la revendication 2, dans lequel l'actionneur (28) est du type stable en position d'activation sans alimentation de l'actionneur (28).  4. Device according to claim 2, wherein the actuator (28) is of the stable type in the activation position without power supply of the actuator (28).
5. Dispositif selon la revendication 2, dans lequel l'actionneur (28) est du type stable en position de désactivation sans alimentation de l'actionneur(28).  5. Device according to claim 2, wherein the actuator (28) is of the stable type in the deactivated position without power supply of the actuator (28).
6. Dispositif selon la revendication 2, dans lequel l'actionneur (28) est du type bistable en position d'activation et en position de désactivation.  6. Device according to claim 2, wherein the actuator (28) is of the bistable type in the activation position and in the deactivated position.
7. Dispositif selon l'une des revendications 1 à 8 comprenant des moyens de rattrapage de jeu hydraulique.  7. Device according to one of claims 1 to 8 comprising means for catching hydraulic play.
8. Dispositif selon l'une quelconque des revendications précédentes, dans lequel l'élément d'actionnement (2) est un linguet.  8. Device according to any one of the preceding claims, wherein the actuating element (2) is a pawl.
9. Dispositif selon la revendication précédente, le premier appui (4) et le deuxième appui (5) étant disposés à des extrémités opposées du linguet (2). 9. Device according to the preceding claim, the first support (4) and the second support (5) being arranged at opposite ends of the pawl (2).
10. Dispositif selon l'une quelconque des revendications précédentes, l'actionneur électromagnétique étant exclusivement électromagnétique. 10. Device according to any one of the preceding claims, the electromagnetic actuator being exclusively electromagnetic.
11. Dispositif selon l'une quelconque des revendications précédentes, l'actionneur électromagnétique étant un actionneur linéaire.  11. Device according to any one of the preceding claims, the electromagnetic actuator being a linear actuator.
12. Dispositif selon l'une quelconque des revendications précédentes, la goupille (26) étant formée par plusieurs pièces rigidement couplées entre elles.  12. Device according to any one of the preceding claims, the pin (26) being formed by several parts rigidly coupled together.
13. Dispositif selon la revendication 12, la goupille (26) comprenant une première pièce réalisée dans un matériau ferromagnétique et soumise au champ magnétique généré par l'actionneur et une deuxième pièce venant verrouiller la tige (11) en coopérant avec la gorge circulaire (27') ménagée dans celle-ci.  13. Device according to claim 12, the pin (26) comprising a first part made of a ferromagnetic material and subjected to the magnetic field generated by the actuator and a second part coming to lock the rod (11) cooperating with the circular groove ( 27 ') formed therein.
14. Dispositif selon la revendication 13, la première et la deuxième pièce de la goupille (26) étant déplacées toutes deux selon un même mouvement de translation par le champ magnétique généré par l'actionneur.  14. Device according to claim 13, the first and the second piece of the pin (26) being both moved in the same translational movement by the magnetic field generated by the actuator.
PCT/FR2011/052976 2010-12-22 2011-12-14 Device for actuating at least one value using an electromagnetic actuator WO2012085393A1 (en)

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FR1061099 2010-12-22
FR1061099A FR2969708B1 (en) 2010-12-22 2010-12-22 IMPROVEMENT OF VALVE ACTUATION DEVICES WITH POSSIBILITY OF DEACTIVATION AND MEANS FOR LOCKING SUCH A DEVICE.

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US6260525B1 (en) * 2000-03-06 2001-07-17 David F. Moyer Engine valve disabler
DE10048619A1 (en) * 2000-09-30 2002-04-11 Ina Schaeffler Kg Supporting element that can be decoupled for internal combustion engine valve drive drag lever, has annular fitting on inner end of housing built into bore in outer housing in cylinder head
DE10048620A1 (en) 2000-09-30 2002-04-11 Ina Schaeffler Kg Switchable support element for valve drive of internal combustion engine has bore for slider formed as blind bore in inner element with axial line intersecting further bore of inner element
DE102005003745A1 (en) * 2005-01-27 2006-08-10 Schaeffler Kg Switch-off support for valve drive in internal combustion engine has piston moving into decoupling position through hydraulic fluid directed out from socket of inner element to in front of its inner end side
DE102006034922A1 (en) * 2006-07-28 2008-01-31 Schaeffler Kg Electromagnetic actuator and method of making same
EP1972761A1 (en) * 2007-03-22 2008-09-24 Otics Corporation Variable valve mechanism
DE102007041928A1 (en) * 2007-09-04 2009-03-05 Schaeffler Kg Switchable supporting element for valve drive of internal-combustion engine, comprises outer element and inner element arranged in internal combustion engine in rotating manner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2985541A1 (en) * 2012-01-11 2013-07-12 Valeo Sys Controle Moteur Sas Butted disconnecting element for actuating e.g. exhaust valve of cylinder of e.g. thermal engine for vehicle, has circular groove formed in transmission system along longitudinal axis and configured to cooperate with latch

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FR2969708B1 (en) 2012-12-28
FR2969708A1 (en) 2012-06-29

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