EP3350421B1 - Dispositif de commande de soupape variable pour moteur a combustion interne - Google Patents

Dispositif de commande de soupape variable pour moteur a combustion interne Download PDF

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Publication number
EP3350421B1
EP3350421B1 EP16770876.7A EP16770876A EP3350421B1 EP 3350421 B1 EP3350421 B1 EP 3350421B1 EP 16770876 A EP16770876 A EP 16770876A EP 3350421 B1 EP3350421 B1 EP 3350421B1
Authority
EP
European Patent Office
Prior art keywords
control
cam
camshaft
valve
control device
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.)
Not-in-force
Application number
EP16770876.7A
Other languages
German (de)
English (en)
Other versions
EP3350421A1 (fr
Inventor
Christian Hubmann
Helmut Melde-Tuczai
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.)
AVL List GmbH
Original Assignee
AVL List GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AVL List GmbH filed Critical AVL List GmbH
Publication of EP3350421A1 publication Critical patent/EP3350421A1/fr
Application granted granted Critical
Publication of EP3350421B1 publication Critical patent/EP3350421B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • 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
    • F01L2013/0052—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 with cams provided on an axially slidable sleeve

Definitions

  • the invention relates to a variable valve control device for internal combustion engines of Hubkolbenbauart with at least one gas exchange valve which is actuated by means of a rotatably mounted about a camshaft axis via a cam rotatably connected to the camshaft, at least two different cam tracks cam device, wherein by means of a control device optionally one of the cam tracks activated and at least one other cam track is deactivatable, and wherein the control device has at least one axially guided in particular within the camshaft actuator, of which by means of at least one driving piece at least one rotatably but axially displaceably mounted on the camshaft, at least two different cam tracks having cam device is adjustable.
  • a valve train of an internal combustion engine in which a cam with different cam tracks is rotated by a camshaft.
  • the cam can be moved axially on the camshaft to realize different valve lifts.
  • the adjustment required for the displacement is arranged in the interior of the camshaft.
  • the movement of the adjusting member is transmitted to the axially displaceable cam via a spring element, which is also guided in the interior of the camshaft. Since the axial displacement of the cam is possible in virtually every rotational position of the camshaft, damage to the cam tracks or transmission devices can not be excluded.
  • the DE 199 08 286 A1 describes a variable valve control device for internal combustion engines, which includes valves for gas exchange control, which are actuated by means of a camshaft.
  • the camshaft has an actuator shaft with an actuator and relatively movable cam devices. Each cam device is mounted axially movable on the stator shaft. Between the cam device and the actuator shaft, a spring device is provided, which seeks to move the cam device in the home position.
  • the cam device cooperates with a triggering device which is provided with a fixedly mounted on the actuator shaft control ring and a radially arranged to the actuator shaft locking pin.
  • the control ring has a control cam, which is in communication with a compression spring locking pin has a control projection.
  • the control cam engages under the control projection in response to an axial position and a radial position of the actuator shaft and lifts after a partial rotation of the actuator shaft to the locking pin, whereby the cam device performs an axial movement in a defined operating position.
  • the spring device holds the cam device in a basic position, from which the actuator shaft moves this cam device as a function of parameters of the internal combustion engine in a defined operating position.
  • the functionally correct movement of the cam device ensuring release device is only effective when the actuator shaft is in defined position settings.
  • the disadvantage is that an additional control effort is necessary for the operation of the triggering device.
  • the DE 102011085702 A1 describes a valve train of an internal combustion engine with at least one sliding cam system consisting of a rotatably driven camshaft and at least one on this in the axial direction slidably and rotationally fixed cam unit having at least two cams with different cam profiles, and an adjusting device which is displaceable relative to the base camshaft , Which is formed as a cylindrical sleeve Verstellkulisse and a radially extending to this, slidable via an actuating unit actuating pin, and which serves to displace the at least one cam unit in the axial direction.
  • the object of the invention is to avoid the disadvantages mentioned and to enable the simplest possible way a reliable and fail-safe variable valve actuation.
  • the blocking element has a control pin fixedly connected to the cam device and a control disk arranged coaxially with the camshaft, preferably fixed, the control disk has at least one control opening for receiving the control pin in at least one angular range.
  • the control disk can be arranged fixed to the housing.
  • the blocking or release of the displaced movement of the cam device is purely mechanical by the arrangement of the control opening on the control disk and the interaction of the control pin with the control port. This can be dispensed with a complex control.
  • the invention also has - compared with that of the DE 199 08 286 A1 known prior art - the advantage that parts and space can be saved.
  • control pin is radially projecting on the cam device, preferably arranged on an outer jacket of the cam device.
  • the control pin is fixed, ie immovable, connected to the cam device, and projecting radially outwardly provided on the outer jacket of the cam device.
  • the control pin can for example be pressed into a radial bore of the cam device, glued or screwed.
  • the Control opening is arranged in one of the cam device facing wall of the control disk, which is for example formed normal to the axis of rotation of the camshaft. A simple production of the control opening is possible if this is designed as a wall breakthrough.
  • the control opening can-viewed in the frontal view-have substantially the shape of a circular segment or a circular ring segment, it being particularly advantageous if the control opening extends over an angular range of at least 60 °, preferably at least 90 °.
  • unimpeded axial displacement of the control pin in the control port is possible without causing a collision of the control pin with the edge of the control disk.
  • damage control pin and the control disc can be prevented.
  • control disk is exposed on both sides of the wall. This prevents collisions of the locking pin with adjacent elements.
  • control opening and the control pin are arranged relative to each other in such angular ranges of the control disk or the camshaft, that the cam device is adjustable only in valve hubleless state, preferably the base circles of the cam tracks a Hubübertragungselement facing.
  • an adjusting force for example a spring force acts on the actuator and the driving piece on the cam device and thus on the control pin in the direction of the control disk, whereby the control pin against the end face of the wall Control disk is pressed.
  • an axial movement of the cam device is prevented. But as soon as the control pin passes through the camshaft rotation in the region of the control opening, this is pressed by the force acting on the cam device spring force through the control opening of the control disk until the control pin has completely penetrated the control port.
  • This adjustment is best done in a valve lift-free state, that is, when the basic circuits a Hubübertragungselement, such as a valve lever or a valve lifter, facing.
  • the cam device is now after the adjustment in its second displacement position.
  • the figures show a variable valve timing device 1 for internal combustion engines with at least one rotatably mounted about a camshaft axis 2 camshaft 3, wherein a cam device 4 with at least two cams 5, 6 and cam tracks 7, 8 with the camshaft 3 rotatably, but axially slidably connected.
  • the cam device 4 acts on a transmission element 30 of a stroke transmission device 31, for example a valve lever, designed as a roller body, which stroke transmission device 31 actuates at least one gas exchange valve of the internal combustion engine which is not shown further in the figures.
  • one of the cam tracks 7, 8 can be activated or deactivated via a control device 10.
  • the control device 10 has at least one axially guided within the camshaft 3 actuator 11, with which a formed by a radial pin driving piece 12 is firmly connected.
  • the actuator 11 is formed as a piston, which is guided in a coaxial with the camshaft axis 2 arranged guide cylinder 13 of the camshaft 3 longitudinally displaceable.
  • the driving piece 12 penetrates in the radial direction a slot 16 of the camshaft 3 and is embedded in a radially extending bore 17 of the cam device 4.
  • the cam device 4 is thus connected via the driving piece 12 with the actuator 11, so that the axial displacement movement of the actuator 11 is transferred between a first displacement position and a second displacement position on the cam device 4.
  • either the first cam 5 or the second cam 6 of the cam device 4 can be selectively activated by bringing the first cam track 7 and the second cam track 8 into engagement with the transmission element 30 of the stroke transmission device 31.
  • the displacement of the cam device 4 can be carried out with minimal expenditure of force in the valve-lift-free state, that is to say when the base circles 7a, 8a of the cam tracks 7, 8 face the transmission element 30 of the stroke transmission device 31.
  • a blocking element 20 is provided.
  • the locking member 20 has a fixedly connected to the cam device 3 control pin 21 and a coaxial with the camshaft 3 arranged housing-fixed control disk 22.
  • the control pin 21 is radially projecting from a cylindrical outer shell 18 of the cam device 4.
  • the control disk 22 has on the cam device 4 side facing a normal to the camshaft axis 2 arranged or extending wall 23, in which a wall opening 24 is formed.
  • the wall opening 24 formed in the exemplary embodiment as a circular ring segment forms a control opening 25 corresponding to the control pin 21 and extends over the camshaft axis 2 over a defined angular range ⁇ , the angular range ⁇ being approximately 130 ° in the exemplary embodiment ( Fig. 9 ).
  • control opening 25 and the control pin 21 are arranged relative to each other in such angular ranges of the control disk 22 and the camshaft 3 that the cam device 4 is adjustable only in a valve-free state, ie when the base circles 7a, 8a of the cam tracks 7, 8 of the stroke transmission device 31 are facing.
  • the wall 23 has a thickness b which substantially corresponds to the thickness d of the control pin 21 - measured in the direction of the camshaft axis 2.
  • the control disk 22 is free on both sides of the wall 23, so that an unobstructed rotation of the control pin 21 about the camshaft axis 2 is possible.
  • the Fig. 1 and Fig. 2 show the cam device 4 in a first displacement position, wherein the first cam 5 is activated with the first cam track 7.
  • the actuator 11 is actuated by the actuator 14 in the Fig. 1 and Fig. 2 to the left, that is pressed in a direction away from the blocking member 20 direction.
  • the basic circuits 7a, 8a face the transmission element 30 of the stroke transmission device.
  • the control pin 21 is located in the region of the control opening 25, so that the axial adjustment movement of the cam device 4 through the locking member 20 - according to the activation of the actuator 14 - is released.
  • FIG. 3 and FIG. 4 also show the cam device 4 in the first displacement position, wherein the first cam 5 is activated with the first cam track 7.
  • the cam 5 is here but in its stroke position - an axial adjustment of the cam device 4 would be undesirable here.
  • the axial adjustment in this camshaft position is blocked by the locking member 20 by the control pin 21 moves to the wall 23 of the control disk 22. It is clear in FIG. 3 and FIG. 4 to recognize that the control pin 21 is in its lower position, which is the control opening 25 diametrically opposite to the camshaft axis 2, and thus rests against the wall 23.
  • the cam device 4 is in a second displacement position, wherein the second cam 6 is activated with the second cam track 8.
  • the actuator 11 is arranged by the arranged within the camshaft 3 return spring 15 with deactivated actuator 14 in the Fig. 5 and Fig. 6 to the right, ie in the direction of the locking member 20, pressed.
  • the basic circuits 7a, 8a here too face the transmission element 30 of the stroke transmission device.
  • the control pin 21 is thus located in the region of the control opening 25, so that the axial adjustment cam device 4 through the locking member 20 - according to the activation of the actuator 14 - is released.
  • FIG. 9 is still - or already a valve lift of the corresponding gas exchange valve causing - cam device 4 still in its second displacement position, however, the adjusting movement of the cam device 4 locked by the actuator 14 in the first displacement position by the locking member 20, since the locking pin 21 is outside the control opening 25 and thus rests against the wall 23. Only when the control pin 21 is rotated by the camshaft 3 in an upper position seen in the figures and - viewed in a projection in the direction of the camshaft axis 2 - within the control opening 25, the adjusting movement is released from the second to the first displacement position ,
  • the blocking member 20 allows easy activation of the activator 14, since it can be activated or deactivated independently of the respective rotational position of the camshaft 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (9)

  1. Dispositif de commande de soupape variable (1) destiné à des moteurs à combustion interne du type à pistons alternatifs ayant au moins une soupape d'échange de gaz qui peut être actionnée au moyen d'un arbre à cames (3) monté mobile en rotation autour d'un axe d'arbre à came (2) par l'intermédiaire d'un dispositif de came (4) relié solidairement en rotation à l'arbre à cames (3) et comportant au moins deux pistes de came (7, 8) différentes, un dispositif de commande (10) permettant sélectivement d'activer l'une des pistes de came (7, 8) et de désactiver l'autre piste de came (8, 7), le dispositif de commande (10) comportant au moins un organe de réglage (11) guidé axialement, en particulier à la partie interne de l'arbre à cames, par lequel peut être réglé au moyen d'une pièce d'entraînement (12) au moins un dispositif de came (4) monté solidairement en rotation mais coulissant axialement sur l'arbre à cames (3) et ayant au moins deux pistes de came (7, 8) différentes, au moins un organe de blocage (20) étant prévu pour permettre de bloquer ou de libérer le mouvement de réglage axial du dispositif de came (4),
    caractérisé en ce que
    l'organe de blocage (20) comporte un tourillon de commande (21) relié solidairement au dispositif de came (4) et un disque de commande (22) de préférence fixe monté coaxialement sur l'arbre à cames (3), le disque de commande (22) ayant dans au moins une plage angulaire au moins une ouverture de commande (25) permettant de recevoir le tourillon de commande (21).
  2. Dispositif de commande de soupape (1) conforme à la revendication 1,
    caractérisé en ce que
    le tourillon de commande (21) dépasse radialement du dispositif à came (4), de préférence dans la zone d'une enveloppe externe cylindrique (18) de ce dispositif de came (4).
  3. Dispositif de commande de soupape (1) conforme à la revendication 1 ou 2,
    caractérisé en ce que
    l'ouverture de commande (25) est située dans une paroi (23) du disque de commande (22) tournée vers le dispositif de came (4), et de préférence la paroi (23) s'étend perpendiculairement à l'axe (2) de l'arbre à cames.
  4. Dispositif de commande de soupape (1) conforme à l'une des revendications 1 à 3,
    caractérisé en ce que
    l'ouverture de commande (25) est réalisée sous la forme d'un perçage (24) de la paroi (23).
  5. Dispositif de commande de soupape (1) conforme à l'une des revendications 1 à 4,
    caractérisé en ce que
    l'ouverture de commande (25) a essentiellement la forme d'un segment circulaire ou d'un segment en forme de bague circulaire.
  6. Dispositif de commande de soupape (1) conforme à l'une des revendications 1 à 5,
    caractérisé en ce que
    l'ouverture de commande (25) s'étend sur une plage angulaire (β) d'au moins 60°, de préférence d'au moins 90° autour de l'axe (2) de l'arbre à cames.
  7. Dispositif de commande de soupape (1) conforme à l'une des revendications 1 à 6,
    caractérisé en ce que
    mesurer en direction de l'axe (2) de l'arbre à cames la paroi (23) a une épaisseur (b) qui correspond essentiellement à l'épaisseur (d) du tourillon de commande (21).
  8. Dispositif de commande de soupape (1) conforme à l'une des revendications 1 à 7,
    caractérisé en ce que
    le disque de commande (22) est libéré de chaque côté de la paroi (23).
  9. Dispositif de commande de soupape (1) conforme à l'une des revendications 1 à 8,
    caractérisé en ce que
    l'ouverture de commande (25) et le tourillon de commande (21) sont positionnés l'un par rapport à l'autre dans une plage angulaire du disque de commande (22) ou de l'arbre à cames (3) telle que le dispositif de came (4) ne puisse être réglé que dans un état sans course de soupape et de préférence les cercles de base (7a, 7b) des pistes de came (7, 8) sont tournés vers un dispositif de transmission de course (31).
EP16770876.7A 2015-09-18 2016-09-19 Dispositif de commande de soupape variable pour moteur a combustion interne Not-in-force EP3350421B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50801/2015A AT517816B1 (de) 2015-09-18 2015-09-18 Variable ventilsteuerungseinrichtung für brennkraftmaschinen
PCT/AT2016/060066 WO2017045009A1 (fr) 2015-09-18 2016-09-19 Distribution variable pour moteurs à combustion interne

Publications (2)

Publication Number Publication Date
EP3350421A1 EP3350421A1 (fr) 2018-07-25
EP3350421B1 true EP3350421B1 (fr) 2019-04-17

Family

ID=57003288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16770876.7A Not-in-force EP3350421B1 (fr) 2015-09-18 2016-09-19 Dispositif de commande de soupape variable pour moteur a combustion interne

Country Status (5)

Country Link
US (1) US10400637B2 (fr)
EP (1) EP3350421B1 (fr)
CN (1) CN108350764B (fr)
AT (1) AT517816B1 (fr)
WO (1) WO2017045009A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107420148B (zh) * 2017-09-25 2020-03-27 浙江美可达摩托车有限公司 一种摩托车发动机的可变气门结构
KR102439627B1 (ko) * 2017-12-12 2022-09-05 현대자동차주식회사 엔진의 가변 밸브 장치
IT201900016283A1 (it) * 2019-09-13 2021-03-13 Piaggio & C Spa Motore a combustione con dispositivo di variazione della fase delle valvole di un albero a camme

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JPS61201804A (ja) * 1985-03-04 1986-09-06 Honda Motor Co Ltd 内燃機関の動弁装置
US5402759A (en) * 1994-07-08 1995-04-04 Outboard Marine Corporation Cylinder decompression arrangement in cam shaft
DE19520117C2 (de) 1995-06-01 2002-04-11 Porsche Ag Ventiltrieb einer Brennkraftmaschine
DE19908286B4 (de) 1999-02-26 2007-03-01 Dr.Ing.H.C. F. Porsche Ag Variable Ventilsteuerung für Brennkraftmaschinen
DE102009037268B3 (de) * 2009-08-10 2011-04-07 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Variabler Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen
JP2011226422A (ja) * 2010-04-21 2011-11-10 Honda Motor Co Ltd 可変動弁機構
DE102011002142B4 (de) * 2011-04-18 2022-07-28 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kulissenschaltung für eine Nockenwelle
DE102011085702A1 (de) * 2011-11-03 2013-05-08 Schaeffler Technologies AG & Co. KG Ventiltrieb einer Brennkraftmaschine mit zumindest einem Schiebenockensystem
DE102011085705A1 (de) * 2011-11-03 2013-05-08 Schaeffler Technologies AG & Co. KG Ventiltrieb einer Brennkraftmaschine
DE102011085706A1 (de) * 2011-11-03 2013-05-08 Schaeffler Technologies AG & Co. KG Ventiltrieb einer Brennkraftmaschine
DE102013007741A1 (de) * 2013-05-07 2014-11-13 Thyssenkrupp Presta Teccenter Ag Nockenwelle

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
EP3350421A1 (fr) 2018-07-25
CN108350764A (zh) 2018-07-31
AT517816B1 (de) 2019-10-15
WO2017045009A1 (fr) 2017-03-23
CN108350764B (zh) 2020-03-10
US20190048760A1 (en) 2019-02-14
US10400637B2 (en) 2019-09-03
AT517816A1 (de) 2017-04-15

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