EP1854967B1 - Tête de cylindre pour un moteur à combustion interne doté d'une commande de soupape à levée variable - Google Patents

Tête de cylindre pour un moteur à combustion interne doté d'une commande de soupape à levée variable Download PDF

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Publication number
EP1854967B1
EP1854967B1 EP20070006942 EP07006942A EP1854967B1 EP 1854967 B1 EP1854967 B1 EP 1854967B1 EP 20070006942 EP20070006942 EP 20070006942 EP 07006942 A EP07006942 A EP 07006942A EP 1854967 B1 EP1854967 B1 EP 1854967B1
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EP
European Patent Office
Prior art keywords
cylinder head
adjusting
adjusting element
variable
stroke
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.)
Active
Application number
EP20070006942
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German (de)
English (en)
Other versions
EP1854967A3 (fr
EP1854967A2 (fr
Inventor
Johannes Meyer
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1854967A2 publication Critical patent/EP1854967A2/fr
Publication of EP1854967A3 publication Critical patent/EP1854967A3/fr
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Publication of EP1854967B1 publication Critical patent/EP1854967B1/fr
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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
    • 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
    • F01L13/0021—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 rocker arm ratio
    • 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
    • F01L13/0021—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 rocker arm ratio
    • F01L13/0026—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 rocker arm ratio by means of an eccentric
    • 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
    • F01L13/0063—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 displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—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 displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • 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
    • F01L2820/032—Electric motors

Definitions

  • the invention relates to a cylinder head for an internal combustion engine with a variable-stroke valve drive with the features of the preamble of claim 1.
  • valvetronic is here the name for a variable-stroke valve train, as it is for example in the German Offenlegungsschrift DE 101 23 186 A1 is described.
  • the gas exchange valve with the interposition of a transmission element with a movable about a rotation axis roller operatively connected to a, a Leerhubkurve and a lift cam control path, which is arranged in an end region of a stroke of the gas exchange valve controlled by a cam of a camshaft pivot lever.
  • the play-free by means of a spring on a roller cam associated with the pivot lever is the other hand for variable stroke adjustment of the gas exchange valve controlled by means of an adjustment position adjustable and fixable swing fulcrum supported along a circular path.
  • an adjustment position adjustable and fixable swing fulcrum supported along a circular path arranged on a housing part of the engine circular path is provided as a backdrop with a radius "R" about the axis of rotation of the roller of the transmission element for controlled positionally variable support of the pivot lever.
  • the adjusting device is a, arranged on an eccentric shaft gear segment. This gear segment is rotated by means of an adjusting element, an electric motor with a threaded screw.
  • the actuator is arranged geodetically above the variable stroke valve train.
  • the attachment of the actuating element is carried out by means of the valve cover. This arrangement can be seen, for example, from the BMW press release 6/2004 on the new BMW straight-six gasoline engine in pictures P0014646 and P0014647.
  • a cylinder head for an internal combustion engine having at least two cylinders, with a variable-stroke valve drive with a pivot lever, which is positively guided rotatably about an axis about a central axis.
  • the pivot lever is supported via a cam track on a driven member for actuating the gas exchange valve.
  • the actuation of the gas exchange valve takes place via a cam of a camshaft, which is in operative connection with a roller arranged on the side facing away from the curved path of the pivoting lever.
  • a servomotor rotates a cam via a threaded screw and thereby displaces the slide so that the gas exchange valve lift can be varied.
  • the longitudinal axis of the servomotor is largely aligned in the direction of the cylinder axis.
  • variable-stroke valve train From the JP-A-2004353643 is also known a variable-stroke valve train.
  • the cam of a camshaft acts on a rotatably mounted, semicircular transmission element with a working curve, which is in operative connection with a rocker arm, a.
  • the rocker arm in turn actuates a gas exchange valve.
  • an actuator can be moved via a worm gear, the pivot point of the transmission element, whereby the contact area of the working curve is changed on the rocker arm and thus the Gas monventilhub is variable.
  • the WO 2005/073523 A1 also discloses a cylinder head with a variable-stroke valve drive for an internal combustion engine.
  • a servomotor is provided, which is arranged transversely to a cylinder axis, that is lying in the cylinder head.
  • a disadvantage of the known prior art is a relatively large and thus "soft" design. Further, it is desirable for package reasons to reduce the size of a generic valve train. Also, temperature fluctuations in the actuator negatively affect the accuracy of the stroke adjustment of the valve train.
  • Object of the present invention is to avoid the above-mentioned disadvantages.
  • the adjusting element can be tempered by a lubricant or a coolant of the internal combustion engine.
  • the adjusting device according to claim 2 is changed either by a linear movement or a rotational movement of the actuating element in the position.
  • the embodiment according to claim 3 is a proven in practice actuator.
  • FIG. 1 shows a plan view of a portion of an inventively designed cylinder head 1 of an internal combustion engine, not shown.
  • the width of the section corresponds approximately to the diameter of a cylinder of the internal combustion engine.
  • the cylinder head 1 has two valve trains, a conventional valve train 2 'on an exhaust side and a variable-stroke valve train 2 on an inlet side. Since the exhaust-side valvetrain 2 'is a conventional valvetrain, this is not explained in the context of the present description.
  • the inlet-side, variable-stroke valve drive 2 largely corresponds to that in the DE 101 23 186 A1 described habvariable valve train.
  • a spark plug arranged in a sleeve.
  • a complete cylinder head 1, for example, for a six-cylinder internal combustion engine is composed of six illustrated sections, but waves, such. B. a camshaft 9 ', are provided in common for all sections.
  • Fig. 1 Between the control track 6 and the roller element 4 is on the pivot lever 3 another, in Fig. 1 also not recognizable roller element arranged, which is in operative connection with the cam 9.
  • the roller element 4 Upon rotation of the camshaft 9 'pivots the pivot lever 3 against a spring force of the spring 10 and pushes with its control cam. 6 the gas exchange valve in an open position.
  • the roller element 4 is supported next to the support on the slide track on an adjusting device 11, with a swing fulcrum of the roller element 4 can be moved parallel to the slide track.
  • the adjusting device 11 consists of an eccentric shaft with a gear segment. A displacement of the roller element 4 with an eccentric along the slide track causes a change in the Gas monventilhubes eighth
  • an actuating element 12 is provided, which is arranged according to the invention on the cylinder head 1.
  • the adjusting element 12 consists essentially of an electric machine with a meshing with the gear segment threaded screw 14.
  • a longitudinal axis 12 'of the adjusting element 12 is largely aligned in the direction of a cylinder longitudinal axis.
  • a portion of the control element 12 may also be integrated into the cylinder head 1.
  • the rigidity of the entire adjusting drive is further improved.
  • the adjusting device 11 can be rotated via a linear movement or a rotational movement of the actuating element 12. This can be done, for example, by hydraulic adjustment systems or electromechanical adjustment systems.
  • the electric machine is a brushless electric motor.
  • the adjusting element 12 prefferably be tempered with a lubricant or a coolant of the internal combustion engine in order to minimize thermal elongation within the entire adjustment mechanism.
  • a very compact arrangement in the Cylinder head is achieved when the actuator 12 is disposed between two ignition devices 15.
  • the arrangement of the actuating element 12 in the cylinder head 1 allows a very compact package, since no parts of the actuating element 12 or the necessary adjusting gear, gear segment and screw, project beyond the edges of the cylinder head 1.
  • the installation site offers the possibility of an optimal connection to a cooled with a coolant surface, so that a good cooling or temperature control of the control element 12 is possible.
  • the actuator 12 may also be cooled with a lubricant of the internal combustion engine.
  • no lubricant-tight seal the stator / rotor unit must be provided, as this also runs directly in the lubricant mist. This eliminates the disadvantage of friction of a shaft seal.
  • the actuator 12 can be checked for operability at the initial assembly or repair even with open cylinder head 1, so that in the case of failure, the cost of rework is much lower. For disassembly of a valve cover hood the actuator 12 does not have to be removed.

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

Claims (5)

  1. Tête de cylindre (1) de moteur à combustion interne à au moins deux cylindres et entraînement de soupapes (2) à levée variable avec un levier pivotant (3) appuyé d'un côté par un élément de rouleau (4) avec un point de rotation oscillant sur un chemin de coulisse (5) et de l'autre, par un appui sans jeu sur un chemin de commande (6) d'un élément intermédiaire (7) pour une soupape d'échange de gaz (8),
    * pour régler la course, le levier pivotant (3) est d'une part pivotant de manière commandée contre la force d'un ressort (10) entre les points d'appui d'une came (9) d'un arbre à cames (9') et d'autre part, le point de rotation oscillant est commandé de manière coulissante par une installation d'actionnement (11) pour régler la hauteur de levée, parallèlement au chemin de coulisse (5'),
    * l'installation d'actionnement (11) est modifiée en position par un élément d'actionnement (12) directement par la sortie de soupape,
    * l'élément d'actionnement (12) étant prévu sur la tête de cylindre (1), et
    * l'axe longitudinal (12') de l'élément d'actionnement (12) étant pratiquement aligné dans la direction de l'axe du cylindre,
    tête de cylindre caractérisé en ce que
    * un segment de l'élément d'actionnement (12) est intégré dans la tête de cylindre (1), et
    * l'élément d'actionnement (12) est mis en température par un agent lubrifiant ou un agent de refroidissement.
  2. Tête de cylindre selon la revendication 1,
    caractérisée en ce que
    l'installation de réglage (11) est réglable en position par un mouvement linéaire ou un mouvement de rotation de l'élément d'actionnement (12).
  3. Tête de cylindre selon l'une des revendications 1 ou 2,
    l'installation de réglage (11) étant un disque de came (13) entraîné en rotation par un segment denté (12),
    caractérisée en ce que
    l'élément d'actionnement (12) est une machine électrique avec une vis (14) engrenant avec le segment denté (12).
  4. Tête de cylindre selon la revendication 3,
    caractérisée en ce que
    la machine électrique est un moteur électrique sans collecteur.
  5. Tête de cylindre selon l'une des revendications précédentes selon lequel à chaque cylindre est associée une installation d'allumage (15) dans la tête de cylindre (1),
    caractérisée en ce que
    l'élément d'actionnement (12) est entre deux installations d'allumage (15).
EP20070006942 2006-05-13 2007-04-03 Tête de cylindre pour un moteur à combustion interne doté d'une commande de soupape à levée variable Active EP1854967B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610022481 DE102006022481A1 (de) 2006-05-13 2006-05-13 Zylinderkopf für eine Brennkraftmaschine mit einem hubvariablen Ventiltrieb

Publications (3)

Publication Number Publication Date
EP1854967A2 EP1854967A2 (fr) 2007-11-14
EP1854967A3 EP1854967A3 (fr) 2010-03-24
EP1854967B1 true EP1854967B1 (fr) 2012-08-15

Family

ID=38255016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070006942 Active EP1854967B1 (fr) 2006-05-13 2007-04-03 Tête de cylindre pour un moteur à combustion interne doté d'une commande de soupape à levée variable

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EP (1) EP1854967B1 (fr)
DE (1) DE102006022481A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008057135B4 (de) * 2008-11-13 2020-11-12 Audi Ag Brennkraftmaschine mit einem Rollenschlepphebel aufweisenden Ventiltrieb
DE102011082226A1 (de) * 2011-09-07 2013-03-07 Bayerische Motoren Werke Aktiengesellschaft Doppelschenkelfeder für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11264310A (ja) * 1998-03-18 1999-09-28 Honda Motor Co Ltd 内燃機関の動弁装置
DE19825308A1 (de) * 1998-06-05 1999-12-09 Bayerische Motoren Werke Ag Variabler Ventiltrieb für eine Brennkraftmaschine
DE10100173A1 (de) * 2001-01-04 2002-07-11 Fev Motorentech Gmbh Vollvariabler mechanischer Ventiltrieb für eine Kolbenbrennkraftmaschine
JP2003003812A (ja) * 2001-06-19 2003-01-08 Suzuki Motor Corp 動弁装置およびこれを備えた内燃機関
DE10206465A1 (de) * 2002-02-16 2003-08-28 Mahle Ventiltrieb Gmbh Steuereinrichtung für Gaswechselventile eines Verbrennungsmotors
DE10211998A1 (de) * 2002-03-18 2003-10-02 Ina Schaeffler Kg Vorrichtung zum Steuern der Zylinderladung eines fremdgezündeten Verbrennungsmotors
DE10312959B4 (de) * 2003-03-24 2006-10-05 Thyssenkrupp Automotive Ag Vorrichtung zur variablen Betätigung der Gaswechselventile von Verbrennungsmotoren
JP2004353643A (ja) * 2003-05-26 2004-12-16 Zenji Ishikawa ４サイクル内燃機関の動弁機構
JP2005042642A (ja) * 2003-07-24 2005-02-17 Honda Motor Co Ltd エンジンの動弁装置
JP4278152B2 (ja) * 2004-01-20 2009-06-10 本田技研工業株式会社 内燃機関の動弁装置
JP4238203B2 (ja) * 2004-01-30 2009-03-18 本田技研工業株式会社 エンジン
FR2872542B1 (fr) * 2004-07-05 2008-09-26 Renault Sas Dispositif d'actionnement variable d'au moins une soupape de moteur a combustion interne et procede de commande associe

Also Published As

Publication number Publication date
EP1854967A3 (fr) 2010-03-24
EP1854967A2 (fr) 2007-11-14
DE102006022481A1 (de) 2007-11-15

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