EP2859199B1 - Dispositif pour un mécanisme de distribution, destiné à inverser la course de soupapes d'échange des gaz d'un moteur à combustion interne - Google Patents

Dispositif pour un mécanisme de distribution, destiné à inverser la course de soupapes d'échange des gaz d'un moteur à combustion interne Download PDF

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Publication number
EP2859199B1
EP2859199B1 EP13725898.4A EP13725898A EP2859199B1 EP 2859199 B1 EP2859199 B1 EP 2859199B1 EP 13725898 A EP13725898 A EP 13725898A EP 2859199 B1 EP2859199 B1 EP 2859199B1
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EP
European Patent Office
Prior art keywords
switching
contour
pin
support
camshaft
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EP13725898.4A
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German (de)
English (en)
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EP2859199A1 (fr
Inventor
Steffen Doller
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IAV GmbH Ingenieurgesellschaft Auto und Verkehr
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IAV GmbH Ingenieurgesellschaft Auto und Verkehr
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    • 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
    • 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
    • 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
    • F01L2013/0078—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 by modification of cam contact point by axially displacing the camshaft

Definitions

  • the present invention relates to a device for a valve train for switching the stroke of gas exchange valves of an internal combustion engine with a parallel to a cam shaft extending push rod.
  • valve train devices which have a device for switching the stroke of gas exchange valves.
  • the invention is based on a valve train in which the gas exchange valves, in particular intake valves and exhaust valves of an internal combustion engine, are actuated directly or indirectly by means of a camshaft.
  • the gas exchange valves in particular intake valves and exhaust valves of an internal combustion engine
  • adjacent cams with different cam shapes are provided on the camshaft, which are combined to form a cam unit.
  • each cam of the cam group is brought into engagement with the corresponding gas exchange valve and generates the stroke of the gas exchange valves according to the cam shape.
  • For the displacement of the cam units a parallel to the camshaft extending push rod is provided with corresponding elements for engagement with the cam units.
  • A1 is a valve train for gas exchange valves of an internal combustion engine with a displaceable cam carrier with an extending over the circumference Endlosnut forth.
  • the cam carrier is rotatably mounted, but axially displaceable on a camshaft and has a plurality of axially spaced cams with different cam lobes, which are combined to form a cam group for the respective gas exchange valve.
  • an engagement element engages continuously, which performs a stroke in the axial direction according to the course of the endless groove.
  • the engagement element can be locked in certain positions, whereby the cam carrier an axial Movement is imposed so as to switch between the cam for driving a gas exchange valve.
  • the publication DE 10 2009 030 373 A1 describes a valve train for an internal combustion engine with variable-displacement gas exchange valve actuation.
  • the camshaft of the valve drive comprises a carrier shaft and a non-rotatably, but axially displaceable cam piece.
  • the cam piece includes cam groups of immediately adjacent cams with different elevations. End of the cam piece, a gate is provided to move the cam piece relative to the carrier shaft by a coupling of an actuating element axially.
  • the revolving with the support shaft cam piece is mounted in a camshaft bearing.
  • the Verstellkulisse on the cam piece is arranged outside of the camshaft bearing, resulting in further axial space for each cam piece.
  • a separate actuator is required for each adjustment.
  • two actuators are used for each cylinder of the internal combustion engine. This increased control effort and component costs in connection with the space requirement represents a major disadvantage of the device.
  • the valve drive consists of a camshaft, which is constructed of a support shaft and thereon rotatably, but axially displaceably mounted cam pieces.
  • On the cam piece is a cam group immediately adjacent cam with different elevations and an axial backdrop.
  • the cam piece is also provided with a journal and stored above it in a camshaft bearing.
  • the trunnion and the adjacent thrust race are overlapped by the camshaft bearing so that the actuator is positioned on the camshaft bearing for displacement of the cam member and extends radially through the bearing for engagement with the thrust race.
  • the bearing Since the Axialkulisse and also the bearing pin are overlapped by the camshaft bearing, the bearing must be made particularly wide in order to provide the required bearing surface according to the bearing loads. This leads to an increased space requirement.
  • the system can only be used in internal combustion engines with sufficiently large valve clearance or cylinder spacing.
  • an actuating element for each cam piece is also required in this system. This is contrary to the current development goal of compact internal combustion engines.
  • the camshaft of the valve drive comprises a drive shaft with at least one cam piece rotatably fixed thereto but axially displaceable, with a group of axially adjacent cams.
  • the cams have different cam lobes.
  • the cam piece is supported radially together with the drive shaft and with an additional coaxially mounted on the cam piece bearing bush in a camshaft bearing.
  • the additional bearing bush is axially displaceable together with the cam piece relative to the camshaft bearing point and the drive shaft, wherein the bearing bush is secured in the camshaft bearing point against rotation.
  • the cam piece and the bearing bush are arranged coaxially on the drive shaft and mounted in the camshaft bearing.
  • a pin is positioned parallel to the axis of rotation of the drive shaft, which performs an oscillating movement through an introduced in the rotating cam piece guide with axial stroke.
  • the pin is temporarily axially fixed by a locking device at the appropriate location.
  • the cam piece is supported on the fixed pin. The cam piece is imposed an axial movement and initiated a switching operation.
  • the United States Patent US 5,129,407 A describes an adjusting device for a camshaft, with which the camshaft can be moved axially.
  • By shifting the camshaft different cams can be positioned with different cam lobes for the actuation of the gas exchange valves.
  • an axial slide is provided, with which an axial displacement in both directions is made possible.
  • the backdrop has two mirror-symmetrical over the circumference contours, each of the two contours generates the necessary for the adjustment stroke for adjusting the camshaft.
  • a region is provided in which the permanently engaged adjusting pin can be positioned without contact with one of the two circumferential contours.
  • the adjusting pin is displaced and held in the axial direction in order to come into contact with one of the two contours and to initiate the axial adjustment of the camshaft in the corresponding direction.
  • camshafts and the cams of modern multi-cylinder internal combustion engines positioned thereon do not allow simultaneous adjustment of the cams and thus no displacement of the entire camshaft, as there is no overlap of the cambases between the various cylinders.
  • the backdrop requires an increase in the length of the camshaft.
  • a valve train for gas exchange valves of an internal combustion engine in which on a camshaft, a cam unit with a plurality of juxtaposed different cam tracks rotatably and axially displaceably mounted and the cam unit is axially displaceable by means of an adjusting means.
  • the adjusting means comprises an adjusting element movably mounted within the camshaft for transmitting the adjusting movement to the cam unit.
  • the adjusting element on its circumference on a raceway profile, which cooperates with a coupling element, wherein the coupling element is further connected by a recess in the camshaft with the cam unit.
  • the adjusting element By a movement of the adjusting element relative to Camshaft causes an axial displacement of the cam unit on the camshaft.
  • the adjusting element is rotatably mounted in the camshaft and that the raceway profile extends substantially in the circumferential direction on the adjusting element.
  • the change between two cam tracks on the cam unit for the actuation of the gas exchange valves is achieved by an axial offset in the raceway profile, which results from a relative rotation of the adjusting element relative to the camshaft.
  • the object of the invention is to provide a device for a valve train for switching the stroke of gas exchange valves of an internal combustion engine, wherein the required space, the technical complexity and the mechanical loads of the adjusting device to be reduced.
  • the object is achieved by a device having the features of claim 1 and a method having the features of claim 7.
  • the invention provides a device with which the stroke of gas exchange valves of a valve train of an internal combustion engine can be varied in a particularly advantageous manner during operation of the internal combustion engine.
  • a camshaft of the valve train is constructed from a carrier shaft configured as a hollow shaft and at least one cam unit mounted on the carrier shaft.
  • the at least one cam unit is rotatably connected to the carrier shaft, but axially displaceably connected.
  • On the cam unit is at least one cam group of axially adjacent cams with an identical base circle, but with different cam contours and / or different cam lobes.
  • At least one cam group is associated with a gas exchange valve, which is used as an outlet valve or inlet valve.
  • the cam group associated gas exchange valve is located alternately with one of different cam of the cam group in operative connection.
  • the cam unit is displaced axially by means of a switching gate which at least partially surrounds the cam unit and a push rod arranged coaxially with respect to the carrier shaft.
  • the Umschaltkulisse is axially displaceable in a housing for a first and at least one further switching position and rotatably mounted relative to the cam unit and has at least one switching contour and at least one support contour.
  • the push rod is mounted axially displaceable within the carrier shaft and rotatably connected to the carrier shaft. This results in a coaxial from inside to outside successive arrangement of push rod, carrier shaft, cam unit and Umschaltkulisse, all adjacent elements are mounted to each other axially displaceable.
  • the Umschaltkulisse includes in the circumferential direction while only a portion of the camshaft. At least one end of the push rod means for axial displacement and axial locking of the push rod are provided. By these means, the push rod can be axially displaced from a first position to at least one further position and locked axially in the respective position.
  • At least one axially displaceable cam unit at least three pins are provided, wherein a first pin is fixedly connected as Umschaltpin with the push rod and can be brought into operative contact by recesses in the carrier shaft and cam unit with the at least one switching contour of Umschaltkulisse.
  • a second pin as a support pin is connected to the push rod and engageable by recesses in the carrier shaft and cam unit with the at least one support contour of Umschaltkulisse in operative contact.
  • a third pin is fixedly connected as sliding pin with the cam unit and can be brought into operative contact with the switching contour of the Umschaltkulisse.
  • the recesses in the carrier shaft and the cam unit are designed so that an axial displacement of the push rod, carrier shaft and cam unit to each other is made possible.
  • the at least three pins are arranged in such a way that in a first chain of action a continuous active contact of push rod with Umschaltpin to Umschaltkulisse can be produced and in at least one other chain of action continuous contact of push rod with Stauerpin to Umschaltkulisse, from Umschaltkulisse to Schiebepin and accordingly to the cam unit produced is.
  • the switching pin is arranged on the push rod such that the changeover pin can engage in the switching contour of the non-rotating Umschaltkulisse by the rotation of the camshaft to cause an axial displacement of the Umschaltkulisse against the push rod and to prepare a switching operation between the different cams.
  • the sliding pin is outside the switching contour and the support pin outside the support contour.
  • the sliding pin on the cam unit and the support pin on the push rod are arranged for the further effect chain in an advantageous manner such that they preferably engage at the same time in the switching contour and in the supporting contour.
  • the sliding pin and the support pin are arranged axially spaced from each other, wherein the axial distance is changed by the displacement of the push rod and / or by the displacement of the cam unit.
  • the Schiebepin and the support pin are arranged to Umschaltpin in the circumferential direction spaced so that the Schiebepin follows the Umschaltpin upon rotation of the camshaft for engaging in the Umschaltkulisse.
  • the Schiebepin and the support pin are thus arranged to Umschaltpin opposite to the direction of rotation of the camshaft, so that they only intervene in the Umschaltkulisse when the Umschaltpin has left the switching contour.
  • the switching contour of Umschaltkulisse is based on the camshaft designed as a circumferentially axially variable contour. If the changeover pin or the sliding pin is brought into operative contact with the switching contour, a relative axial displacement of changeover pin or sliding pin to the changeover gate takes place.
  • the switching contour is designed so that the respective pin moves through the switching contour of the non-rotating Umschaltkulisse by the rotation of the camshaft while an axial stroke between the respective pin and the Umschaltkulisse is generated.
  • two mirror-symmetrically opposite switching contours are provided on the Umschaltkulisse to an axial displacement in both directions To allow switching gate and cam unit relative to the carrier shaft.
  • a first and a second switching contour are therefore arranged such that the vertical distance of the switching contours to each other in the direction of rotation of the camshaft is reduced.
  • the smallest distance is at least so great that the Umschaltpin or Schiebepin unhindered can pass between the two switching contours, without causing an axial displacement.
  • the support contour of Umschaltkulisse is based on the camshaft designed as a circumferentially axially constant contour. If the support pin is brought into operative contact with the support contour, there is no relative displacement of support pin or push rod and shift gate.
  • two mirror-symmetrically opposite support contours are provided on the Umschaltkulisse to support an axial displacement in both directions of Umschaltkulisse and cam unit relative to the carrier shaft or the push rod. Accordingly, a first and a second support contour are arranged such that the vertical distance between the support contours to each other remains constant and at least so great that the support pin can pass unhindered between the two support contours.
  • the invention provides a device for a valve train for switching the stroke of gas exchange valves of an internal combustion engine, comprising a rotatably mounted in a housing camshaft, which consists of a coaxial from the inside outwards arrangement of at least one push rod, at least one carrier shaft and at least one is constructed with at least two different cams and at least one sliding pin provided cam unit, and the camshaft is at least partially enclosed by at least one rotatably and axially displaceably mounted in a housing Umschaltkulisse.
  • At least one Umschaltpin and at least one support pin is fixedly connected to the push rod, wherein the Umschaltpin and the support pin extends in recesses at least through the carrier shaft and the Umschaltpin with at least one switching contour on the Umschalkulisse and the Stauerpin with at least one Stauerköntur on the Umschaltkulisse in operative contact can be brought.
  • the switching gate has a first switching contour, a second switching contour opposite the first switching contour, a first supporting contour and a second supporting contour opposite the first supporting contour.
  • the switching contour is based on the camshaft is designed as a circumferentially axially variable contour and thus generates by the rotation of the camshaft relative to the Umschalkulisse an axial stroke between the Umschaltpin or Schiebepin and the Umschaltkulisse.
  • the support contour based on the camshaft is designed as a circumferentially axially immutable contour.
  • the switching contours and the supporting contours on the Umschaltkulisse are arranged side by side.
  • the changeover pin is arranged axially spaced on the camshaft to the sliding pin and the support pin in the circumferential direction and the support pin.
  • each gas exchange valve may be assigned a cam group.
  • at least one inlet valve is assigned a cam group.
  • the cam groups of the respective intake valve may be combined to form a common cam unit, wherein a synchronous Hubumscrien between the various cams with different cam contours or cam lobes of the respective associated gas exchange valve can take place.
  • the cam groups of adjacent cylinders can be arranged on a common cam unit. For example, for a four-cylinder internal combustion engine and two intake valves in each cylinder, a total of four cam groups are located on a cam unit.
  • cams of the respectively assigned cam groups which are in contact with the gas exchange valves at the same time, may have the same cam contours or cam elevations for a symmetrical valve lift or may also have different cam contours or cam elevations to produce an asymmetrical valve lift.
  • a cam without cam lobe for realizing a valve shutdown can be provided in the cam group.
  • the first action chain is generated.
  • the Umschaltkulisse is moved from a neutral position, in which the Umschaltpin and the Schiebepin unhindered pass between the two switching contours, in the first switching position.
  • the switching pin moves with further rotation of the camshaft in the Umschaltkulisse and enters into operative contact with the first switching contour of Umschaltkulisse.
  • the Umschaltkulisse Due to the course of the switching contour, the Umschaltkulisse is axially displaced, since the push rod is supported by the means for axially locking the push rod after the completed axial displacement.
  • the axial displacement of the Umschaltkulisse corresponds to the axial stroke of the switching contour, which is generated by the active contact between the switching contour and Umschaltpin.
  • the first chain of action is canceled and made the other chain of action.
  • the sliding pin engages in the switching gate and the operative contact between the sliding pin and the first switching contour is established.
  • the support pin engages in the Umschaltkulisse and it is made the active contact between the support pin and the first support contour. Due to the further rotation of the camshaft and the course of the switching contour, the cam unit is moved axially with the sliding pin, since the Umschaltkulisse is locked axially on the support pin with the push rod.
  • the axial displacement of the cam unit corresponds to the axial stroke of the switching contour, which is generated by the active contact between the switching contour and sliding pin.
  • a locking actuator is extended from a locking contour on the push rod during rotation of the camshaft and a Verstellaktuator in a Verstellkontur retracted on the push rod, whereupon the push rod is axially displaced.
  • the changeover pin then acts on the switching contour of the Umschaltkulisse and causes a shift of Umschalkulisse.
  • the sliding pin acts on the switching contour and the supporting pin on the supporting contour and there is a displacement of the cam unit, whereby the switching between two adjacent cams is completed.
  • the first chain of action is generated by the Umschaltkulisse is shifted such that the Umschaltpin with the second switching contour comes into operative contact and the further chain of action is generated by the Schiebepin with the second switching contour and the supporting pin comes into operative contact with the second supporting contour.
  • these devices are advantageously designed as actuators with a pin, which engage in locking contours or Verstellkonturen on the push rod.
  • a separate locking contour is provided, which is designed as a closed circumferential groove without axial stroke.
  • At least one Arretieraktuator engages in accordance with the position of the push rod associated Arretierkontur to lock the push rod or support.
  • the adjustment contour is also designed as a closed, circumferential groove, wherein the groove generates an alternating axial stroke. For multiple circuits a multi-stepped stroke course is provided.
  • a Verstellaktuator engages in the Verstellkontur to produce an axial displacement of the push rod.
  • the push rod can be moved between at least two or more positions. This results in the possibility to switch between at least two or more cams of a cam unit.
  • the device according to the invention shown in FIG FIGURES 1-5 , consists of a camshaft, which is composed of a coaxial arrangement of a push rod 1, a support shaft 2 and a cam unit 3 .
  • the carrier shaft 2 is designed as a hollow shaft, so that it can receive the push rod 1 rotatably but axially displaceable.
  • the cam unit 3 is non-rotatably but axially slidably mounted on the support shaft 2 and has two groups of cams 4, 5 of each of two different cams 6, 7, 8,. 9
  • a first cam 6, 8 or a second cam 7, 9 of the respective cam group 4, 5 is aligned to an associated gas exchange valve 15, 16 to the gas exchange valve 15, 16 respectively a cam lobe on the cam 6 , 7 , 8 , 9 to operate.
  • the Umschaltkulisse 10 surrounds the camshaft only partially and is axially displaceable and rotatably mounted in a housing, not shown.
  • the first cam 6, 8 of each cam group 4, 5 has a cam contour with a cam lobe, with which the gas exchange valve 15, 16 is actuated and accordingly generates a lift of the gas exchange valve 15, 16 .
  • the second cam 7, 9 of the respective cam group 4, 5 has a Cam contour without cam lobe, so that the associated gas exchange valve 15, 16 remains closed when turning the camshaft.
  • the switching pin 17 and the supporting pin 19 are in recesses 20 , 21 , 22 , 23 in the carrier shaft 2 and cam unit 3 are positioned so that they can come into operative contact with the contours 11 , 12 , 13 , 14 in the Umschaltkulisse 10 when turning the camshaft.
  • the sliding pin 18 and the support pin 19 are axially spaced from each other and arranged in the circumferential direction to each other at the same position.
  • the Umschaltpin 17 is arranged to the shift pin 18 and support pin 19 in the circumferential direction spaced such that engage in the rotation of the camshaft either the Umschaltpin 17 or the sliding pin 18 and the support pin 19 in the Umschaltkulisse 10 .
  • a locking actuator 24 is provided, which engages in a corresponding position of the push rod 1 in an associated locking contour 25 .
  • the locking contour 25 is designed as a circumferential closed groove without axial stroke.
  • an adjustment contour 27 is provided, which is designed as a closed circumferential groove with changing axial stroke.
  • An adjusting actuator 26 engages in the Verstellkontur 27 to produce an axial displacement of the push rod 1 .
  • an axial displacement of the push rod 1 is made during the rotation of the camshaft.
  • the axial locking of the push rod 1 is released by the Arretieraktuator 24 is moved out of the Arretierkontur 25 .
  • the thrust rod 1 is now axially movable and is displaced by a corresponding engagement of the Verstellaktuators 26 in the Verstellkontur 27th
  • the engagement of the Verstellaktuators 26 must take place in that rotational phase of the push rod 1 , in which the adjustment contour 27 generates an axial stroke in the direction of the adjustment direction to be performed.
  • the Umschaltpin 17 engages in the Umschaltkulisse 10 and occurs with the switching contour 11 , 12 in operative contact and moves the Umschaltkulisse 10 according to the stroke of the switching contour 11 , 12th
  • the displacement of the Umschaltkulisse 10 is supported via the Umschaltpin 17 and the push rod 1 in the Arretieraktuator 24 .
  • the cam unit 3 through the Schiebepin 18 and the support pin 19 is displaced relative to the support shaft 2 subsequently.
  • the sliding pin 18 engages in the switching contour 11, 12 of the Umschalkulisse 10 and the support pin 19 in the support contour 13, 14 a.
  • the Umschaltkulisse 10 is locked axially on the support pin 19 and the push rod 1 by the Arretieraktuator 24 .
  • the sliding pin 18 comes into operative contact with the switching contour 11, 12 and shifts the cam unit 3 according to the stroke of the switching contour 11, 12 with respect to the carrier shaft 2. All pins 17 , 18 , 19 are now as in the beginning of the switching operation in a position in which the Umschalkulisse 10 can be passed through unhindered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (8)

  1. Dispositif pour un entraînement de soupape pour la commutation de la course de soupapes d'échange de gaz (15, 16) d'un moteur à combustion interne avec un arbre à cames disposé de façon à pouvoir pivoter dans un carter et constitué d'un agencement d'au moins une tige de poussée (1), d'au moins un arbre de support (2) et d'au moins une unité de cames (3) pourvue d'au moins deux cames (6, 7, 8, 9) différentes et d'au moins une broche coulissante (18) se suivant dans le plan coaxial de l'intérieur vers l'extérieur, la tige de poussée (1), l'arbre de support (2) et l'unité de cames (3) étant disposés de façon solidaire en rotation et de façon à pouvoir se déplacer les uns par rapport aux autres dans le plan axial et l'arbre à cames étant englobé au moins en partie par au moins une coulisse de commutation (10) disposée solidairement en rotation dans un carter et disposée de façon à pouvoir se déplacer dans le plan axial, caractérisé en ce qu'au moins une broche de commutation (17) et au moins une broche de maintien (19) sont reliées fixement sur place avec la tige de poussée (1), la broche de commutation (17) et la broche de maintien (19) s'étendant dans des évidements (20, 21, 22, 23) réalisés au moins à travers l'arbre de support (2) et la broche de commutation (17) pouvant être amenée en contact actif avec au moins un contour de connexion (11, 12) sur la coulisse de commutation (10) et la broche de maintien (19) pouvant être amenée en contact actif avec au moins un contour de maintien (13, 14) sur la coulisse de commutation (10).
  2. Dispositif de commutation de la course de soupapes d'échange de gaz (15, 16) d'un moteur à combustion interne selon la revendication 1, caractérisé en ce que la coulisse de commutation (10) dispose d'un premier contour de connexion (11), d'un deuxième contour de connexion (12) opposé au premier contour de connexion (11), d'un premier contour de maintien (13) et d'un deuxième contour de maintien (14) opposé au premier contour de maintien (13).
  3. Dispositif de commutation de la course de soupapes d'échange de gaz d'un moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisé en ce que le contour de connexion (11, 12) est réalisé, par rapport à l'arbre à cames, sous la forme d'un contour variable dans le plan axial dans la direction circonférentielle et que par conséquent, une course axiale se produit entre la broche de commutation (17) ou la broche coulissante (18) et la coulisse de commutation (10) du fait de la rotation de l'arbre à cames par rapport à la coulisse de commutation (10) et que le contour de maintien (13, 14) est réalisé, par rapport à l'arbre à cames, sous la forme d'un contour invariable dans le plan axial dans la direction circonférentielle.
  4. Dispositif de commutation de la course de soupapes d'échange de gaz (15, 16) d'un moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisé en ce que deux contours de connexion (11, 12) opposés symétriques par rapport à un axe sont prévus sur la coulisse de commutation (10), un premier et un deuxième contour de connexion (11, 12) étant disposés de telle sorte que l'écartement vertical des contours de connexion (11, 12) l'un par rapport à l'autre est réduit dans la direction de rotation de l'arbre à cames et que deux contours de maintien (13, 14) opposés symétriques par rapport à un axe sont prévus sur la coulisse de commutation (10), un premier et un deuxième contour de maintien (13, 14) étant disposés de telle sorte que l'écartement vertical des contours de maintien (13, 14) reste inchangé.
  5. Dispositif de commutation de la course de soupapes d'échange de gaz (15, 16) d'un moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisé en ce que les contours de connexion (11, 12) et les contours de maintien (13, 14) se trouvent côte à côte sur la coulisse de commutation (10).
  6. Dispositif de commutation de la course de soupapes d'échange de gaz (15, 16) d'un moteur à combustion interne selon l'une quelconque des revendications précédentes, caractérisé en ce que la broche de commutation (17) est disposée à une certaine distance, sur l'arbre à cames, de la broche coulissante (18) et de la broche de maintien (19) dans la direction circonférentielle et est disposée à une certaine distance de la broche de maintien (19) dans le plan axial.
  7. Procédé de commutation de la course de soupapes d'échange de gaz (15, 16) d'un moteur à combustion interne par utilisation d'un dispositif selon la revendication 1, caractérisé en ce qu'une première chaîne active est fabriquée avec un contact actif continu allant de la tige de poussée (1) avec la broche de commutation (17) jusqu'à la coulisse de commutation (10) et que la coulisse de commutation (10) est poussée dans le plan axial par rapport à l'arbre de support (2) et qu'après le coulissement de la coulisse de commutation (10), la première chaîne active est levée et qu'une autre chaîne active est fabriquée avec un contact actif continu allant de la tige de poussée (1) avec la broche de maintien (19) jusqu'à la coulisse de commutation (10), de la coulisse de commutation (10) jusqu'à la broche coulissante (18) et de façon correspondante jusqu'à l'unité de cames (3) et que l'unité de cames (3) est coulissée par rapport à l'arbre de support (2).
  8. Procédé de commutation de la course de soupapes d'échange de gaz (15, 16) d'un moteur à combustion interne selon la revendication 7, caractérisé en ce que pendant la rotation de l'arbre à cames, un actionneur d'arrêt (24) est sorti d'un contour d'arrêt (25) sur la tige de poussée (1) et qu'un actionneur de réglage (26) est rentré dans un contour de réglage (27) sur la tige de poussée (1), la tige de poussée (1) étant ainsi coulissée dans le plan axial et, à la fin du coulissement de l'actionneur de réglage (26), sortie du contour de réglage (27) et l'actionneur d'arrêt (24) étant rentré dans le contour d'arrêt (25), la broche de commutation (17) agissant sur le contour de connexion (11, 12) de la coulisse de commutation (10) et provoquant un coulissement de la coulisse de commutation (10), la broche coulissante (18) agissant ensuite sur le contour de connexion (11, 12) et la broche de maintien (19) agissant sur le contour de maintien (13, 14) et provoquant un coulissement de l'unité de cames (3).
EP13725898.4A 2012-04-27 2013-04-26 Dispositif pour un mécanisme de distribution, destiné à inverser la course de soupapes d'échange des gaz d'un moteur à combustion interne Active EP2859199B1 (fr)

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DE102012008555.9A DE102012008555B4 (de) 2012-04-27 2012-04-27 Vorrichtung für einen Ventiltrieb zum Umschalten des Hubs von Gaswechselventilen einer Brennkraftmaschine
PCT/DE2013/000236 WO2013159765A1 (fr) 2012-04-27 2013-04-26 Dispositif pour un mécanisme de distribution, destiné à inverser la course de soupapes d'échange des gaz d'un moteur à combustion interne

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US20150059677A1 (en) 2015-03-05
WO2013159765A1 (fr) 2013-10-31
DE102012008555B4 (de) 2014-11-27
JP2015514914A (ja) 2015-05-21
US9249697B2 (en) 2016-02-02
EP2859199A1 (fr) 2015-04-15
DE102012008555A1 (de) 2013-10-31

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