EP2859199A1 - 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

Info

Publication number
EP2859199A1
EP2859199A1 EP13725898.4A EP13725898A EP2859199A1 EP 2859199 A1 EP2859199 A1 EP 2859199A1 EP 13725898 A EP13725898 A EP 13725898A EP 2859199 A1 EP2859199 A1 EP 2859199A1
Authority
EP
European Patent Office
Prior art keywords
switching
contour
umschaltkulisse
support
camshaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13725898.4A
Other languages
German (de)
English (en)
Other versions
EP2859199B1 (fr
Inventor
Steffen Doller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IAV GmbH Ingenieurgesellschaft Auto und Verkehr
Original Assignee
IAV GmbH Ingenieurgesellschaft Auto und Verkehr
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 IAV GmbH Ingenieurgesellschaft Auto und Verkehr filed Critical IAV GmbH Ingenieurgesellschaft Auto und Verkehr
Publication of EP2859199A1 publication Critical patent/EP2859199A1/fr
Application granted granted Critical
Publication of EP2859199B1 publication Critical patent/EP2859199B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • 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.
  • 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. To switch the valve lift are on the camshaft
  • Cam units on the camshaft each cam of the cam group is brought into engagement with the corresponding gas exchange valve and the stroke of
  • 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.
  • Intervention element necessary, which must be activated at the right time.
  • the published patent application DE 10 2009 030 373 A1 describes a valve drive for an internal combustion engine with variable-stroke 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 train consists of a camshaft, which consists of a carrier shaft and then rotatably, but axially
  • cam piece On the cam piece is a cam group immediately adjacent cam with different elevations and an axial backdrop.
  • the cam piece is also with a
  • Bearing journals and the adjacent axial slide are overlapped by the camshaft bearing, so that the actuator for displacing the cam piece is positioned on the camshaft bearing and extends radially through the bearing for engagement in the Axialkulisse. 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 '
  • valve spacing or cylinder spacing can be used.
  • 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 rotatably fixed thereto, but axially displaceable
  • cam piece with a group of axially adjacent cams.
  • the cams have different cam lobes.
  • the cam piece is
  • Cam bearing bearing bush in a camshaft bearing radially
  • 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.
  • Bearing bush arranged one above the other coaxially and stored 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. As a result, the cam piece is supported on the fixed pin.
  • Cam piece is imposed on an axial movement and initiated a switching operation.
  • Switching device of a cam piece is to provide a separate locking device, which must initiate a switching operation at the right time.
  • the pin also leads to high loads in the guide groove during the Shift. Furthermore, the pin is subject to high wear, since the pin must be clamped for each switching operation.
  • circumferential contours can be positioned.
  • 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.
  • Camshaft as there is no overlap of the cam base circles between the different cylinders.
  • the backdrop requires an increase in the length of the camshaft.
  • 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 a movably mounted within the camshaft adjusting element for transmitting the adjustment movement on 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.
  • 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 an apparatus for a valve train for switching the stroke of gas exchange valves of an internal combustion engine
  • 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 an apparatus 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
  • 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.
  • Displacement of the cam unit relative to the gas exchange valve is in each case a cam of the associated cam group can be brought into operative contact with the gas exchange valve.
  • the shift occurs when the associated gas exchange valve is in operative contact with the respective cam in the region of the base circle.
  • the cam unit is at least partially formed by means of a cam unit
  • 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
  • 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
  • At least one end of the push rod means for axial displacement and axial locking of the push rod are provided.
  • Push rod are moved axially from a first position in at least one other 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 through recesses in the carrier shaft and cam unit with the at least one support contour of
  • Switching gate can be brought into 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 cam unit are designed so that an axial displacement of push rod, carrier shaft and
  • Cam unit is enabled to each other.
  • the at least three pins are arranged relative to one another in such a way that, in a first chain of action, a continuous operative contact of the push rod with the changeover pin is required
  • Umschaltkulisse can be produced and in at least one other chain of action a continuous active contact of push rod with support pin to Umschaltkulisse, from Umschaltkulisse to Schiebepin and accordingly to the cam unit is produced.
  • the Umschaltpin is arranged on the push rod such that the Umschaltpin by the rotation of the camshaft in the switching contour of non-rotating
  • Umschaltkulisse can engage to cause an axial displacement of the Umschaltkulisse against the push rod and to prepare a switching operation between the different cams. During the active contact of the first
  • 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 Schiebepin and the support pin are arranged axially spaced from each other, wherein the axial distance by the displacement of the push rod and / or by the displacement of the
  • the Schiebepin and the support pin are arranged to Umschaltpin in the circumferential direction spaced so that the Schiebepin the
  • Shift pin follows upon rotation of the camshaft for engagement 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 formed 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 unhindered between the two
  • the invention provides an apparatus for a valvetrain
  • Push rod at least one carrier shaft and at least one provided with at least two different cams and at least one Schiebepin
  • Cam unit is constructed, and the camshaft is at least partially by at least one rotatably in a housing and axially displaceably mounted shift gate is included.
  • 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.
  • Shift 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 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
  • 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 Hubumscnies between the different cams with different cam contours or
  • Cam elevations of the respective associated gas exchange valve can be done.
  • 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. In order to enable a changeover for all cylinders, then a total of two cam groups are provided. The cams of the respectively assigned cam groups which coincide with the
  • Gas exchange valves are in contact, may have the same cam contours or cam lobes for a symmetrical valve lift or else
  • Valve shutdown may be provided.
  • the Umschaltkulisse is starting from a neutral position in which the
  • Shift pin and the sliding pin can pass unhindered between the two switching contours, moved to the first switching position. For that is by at the Push rod provided devices initiated an axial displacement of the push rod and the Umschaltpin moved axially together with the support pin. 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. 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.
  • Push rod is axially locked.
  • 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.
  • Umschaltkulisse against the carrier shaft is axially displaced, and after the shift of Umschaltkulisse the first chain of action is canceled and another chain of action with a continuous active contact of push rod with support pin to Umschaltkulisse, made of Umschaltkulisse to Schiebepin and accordingly to the cam unit and the cam unit relative to the carrier shaft
  • 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.
  • Shift gate is shifted so that the Umschaltpin with the second
  • Switching contour comes into operative contact and the further chain of action is generated by the sliding pin with the second switching contour and the support pin with the second support contour comes into operative contact.
  • these devices are advantageously designed as actuators with a pin, which engage in locking contours or Verstellkonturen on the push rod.
  • Push rod is provided a separate Arretierkontur, 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 Verstellkontur is also designed as a closed, circumferential groove, the groove a
  • FIG. 1 shows a schematic representation of a device according to the invention for a valve drive for switching over the stroke of gas exchange valves of a valve train
  • FIG. 2 a schematic representation of the device as a front view
  • FIG. 3 a first schematic sectional view of the device
  • FIG. 4 a schematic representation of the device as a side view
  • FIG. 5 a second schematic sectional view of the device.
  • the device according to the invention consists of a camshaft, which is constructed from a coaxial arrangement of a push rod 1, a carrier shaft 2 and a cam unit 3.
  • the carrier shaft 2 is designed as a hollow shaft, so that it rotatably but axially the push rod 1
  • the cam unit 3 is rotatably but axially displaceably arranged on the support shaft 2 and has two cam groups 4, 5 of two different cams 6, 7, 8, 9th
  • a switching gate 10 with switching contours 11, 12 and supporting contours 13 14 is in each case a first cam 6, 8 or a second cam 7, 9 of the respective
  • 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 stroke 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 the associated
  • Gas exchange valve 15, 16 remains closed when turning the camshaft.
  • Shift gate 10 can come into operative contact.
  • the Umschaltpin 17 is the Schiebepin 18 and
  • Support pin 19 arranged circumferentially spaced such that upon rotation of the camshaft either the Umschaltpin 17 or the sliding pin 18 and the
  • Support pin 19 engage in the Umschaltkulisse 10.
  • a locking actuator 24 For axial locking of the push rod 1, 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.
  • a Verstellkontur 27 is provided which as a closed circumferential groove with
  • An adjusting actuator 26 engages in the
  • Push rod 1 is now axially displaceable and is displaced by a corresponding engagement of the Verstellaktuators 26 in the Verstellkontur 27. The intervention of the
  • Shift gate 10 is supported via the changeover pin 17 and the push rod 1 in the Arretieraktuator 24.
  • the cam unit 3 is displaced relative to the carrier shaft 2 by the sliding pin 18 and the support pin 19 as a result of the further rotation of the camshaft.
  • 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 about the

Landscapes

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

Abstract

Dispositif pour un mécanisme de distribution, destiné à inverser la course de soupapes d'échange des gaz d'un moteur à combustion interne comportant un arbre à cames monté rotatif dans un carter et constitué d'une suite d'éléments coaxiaux, de l'intérieur vers l'extérieur, composée d'au moins une bielle, d'au moins un arbre de support et d'au moins une unité à cames pourvue d'au moins deux cames différentes et d'au moins une broche coulissante. L'arbre à cames est entouré au moins partiellement d'au moins une coulisse d'inversion montée dans le carter de manière à ne pas tourner et à pouvoir coulisser axialement. La bielle est reliée de manière fixe avec au moins une broche d'inversion et au moins une broche d'appui, la broche d'inversion et la broche d'appui s'étendant au moins à travers l'arbre de support dans des évidements. La broche d'inversion peut être amenée en contact fonctionnel avec au moins un contour d'inversion situé sur la coulisse d'inversion, et la broche d'appui peut être amenée en contact fonctionnel avec au moins un contour d'appui situé sur la coulisse d'inversion.
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)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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

Publications (2)

Publication Number Publication Date
EP2859199A1 true EP2859199A1 (fr) 2015-04-15
EP2859199B1 EP2859199B1 (fr) 2016-08-24

Family

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EP13725898.4A Active EP2859199B1 (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

Country Status (5)

Country Link
US (1) US9249697B2 (fr)
EP (1) EP2859199B1 (fr)
JP (1) JP2015514914A (fr)
DE (1) DE102012008555B4 (fr)
WO (1) WO2013159765A1 (fr)

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CN116921892A (zh) * 2023-08-24 2023-10-24 契克科技(苏州)有限公司 一种气动卡盘的定点配气机构

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US9249697B2 (en) 2016-02-02
JP2015514914A (ja) 2015-05-21
DE102012008555A1 (de) 2013-10-31
EP2859199B1 (fr) 2016-08-24
WO2013159765A1 (fr) 2013-10-31
US20150059677A1 (en) 2015-03-05
DE102012008555B4 (de) 2014-11-27

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