EP1387928B1 - Systeme de commande de soupape pour modifier la course d'une soupape de gaz a deux voies d'un moteur a combustion - Google Patents

Systeme de commande de soupape pour modifier la course d'une soupape de gaz a deux voies d'un moteur a combustion Download PDF

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Publication number
EP1387928B1
EP1387928B1 EP02750861A EP02750861A EP1387928B1 EP 1387928 B1 EP1387928 B1 EP 1387928B1 EP 02750861 A EP02750861 A EP 02750861A EP 02750861 A EP02750861 A EP 02750861A EP 1387928 B1 EP1387928 B1 EP 1387928B1
Authority
EP
European Patent Office
Prior art keywords
valve
roller
stroke
rocking lever
track
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.)
Expired - Lifetime
Application number
EP02750861A
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German (de)
English (en)
Other versions
EP1387928A1 (fr
Inventor
Rudolf Flierl
Michael Allgeier
Harald Dr. Unger
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
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1387928A1 publication Critical patent/EP1387928A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01L13/0063—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • 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
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/13—Throttleless

Definitions

  • the invention relates to a valve train device for variable stroke adjustment of a gas exchange valve of an internal combustion engine, in which the gas exchange valve with the interposition of a transmission element with a rotatable about a rotation axis roller is in operative connection with a Leerhubkurve and a lift curve comprehensive control path in an end region for a lifting operation the gas exchange valve of a cam of a camshaft controlled pivot lever, wherein the spring-loaded via a cam track associated with the cam pivot lever is supported on the other hand for variable stroke adjustment via a controlled by means of an adjustment position adjustable and fixable swing fulcrum along a circular path.
  • Such a valve train device is known from DE 197 08 484 A1, wherein the pivot lever in its ponderebahnfemen end portion has a circular arc-shaped toothing for engagement in a toothing of a control shaft which serves as adjusting means for changing the specific stroke of the gas exchange valve associated pivot position.
  • the swinging fulcrum of the pivoting lever results here in the contact point of the pitch circles.
  • the action of the cam of an adjacent camshaft on the pivot lever causes it to be in the toothing the stationary control shaft rolls and in addition to a pivoting movement or a rotational movement with respect to the role of the transmission element and a translational component of motion occurs with the fact of a relation to the intended stroke changed stroke of the gas exchange valve.
  • valve train device is also known from DE 42 23 172 C1, wherein the purpose of achieving a variable stroke - zero stroke to full stroke - pivoted by the cam of a camshaft pivot lever in its free end of the lever adjacent the line contact with one of Hub adjustment serving cam is guided over a slot on a fixed housing bolt. Also in this guide, the pivot lever is subject to a lifting operation of the gas exchange valve in its oscillating fulcrum of a rotary and a translational motion component, the translational component of movement corresponds to the function of a cam or a ramp, but otherwise precludes an increase in the dynamics of the valve train.
  • the invention is based on the object kinematically develop a pivot lever for the generic valve train device such that this allows for a pure rotational movement or pivotal movement increased valve train dynamics.
  • the advantage is achieved that the oscillating pivot point of the pivot lever forms an invariable instantaneous pole during the lifting operation for a set valve stroke and thus a translational movement component is advantageously avoided.
  • the Control time are shortened at stroke change of the gas exchange valve to a much greater extent, with delayed opening and closing sections omitted in partial strokes substantially.
  • the invention provides a valve drive device of high rigidity, which is further advantageous for increased valve acceleration.
  • the valve train device according to the invention allows an actual zero stroke and at the Volliast by a maximum opening gas exchange valve an increased torque associated with a high speed resistance.
  • the pivot lever is supported at its end remote from the control rod via a rotatable about an axis roller against the housing side circular path or backdrop and by means of the adjustment in each case fixed such that controlled along an equidistant to the circular path displaceable axis the role of the respective variable stroke adjustment serving swing pivot point of the pivot lever forms.
  • a valve drive results with the instantaneous pole or oscillating pivot point displaced according to the invention into the axis of the circular path roller of the pivot lever Device of reduced wear at much lower friction and high functional accuracy, further wherein the energy for the adjustment is reduced in an advantageous manner.
  • a roller cam follower supported on the housing side via a hydraulic valve play compensation device is provided as the transfer element, the ramp provided for replacing the lost translational movement component being designed for a substantially constant stroke speed with a maximum stroke exceeding the maximum valve clearance.
  • a valve train device 1 is used for variable stroke adjustment of a gas exchange valve 2 of an internal combustion engine, not shown, wherein the gas exchange valve 2 is one of a plurality of identical intake valves of a cylinder of the internal combustion engine, not shown.
  • the gas exchange valve 2 with the interposition of a transmission element 3 with a movable about a rotation axis 4 roller 5 in operative connection with a Leerhubkurve 6 'and a lift curve 6 "comprehensive control path 6, in an end region of a lifting operation of the gas exchange valve 2 of a cam 7 'of a camshaft 7 controlled pivot lever 8.
  • the pivotally 8 by means of a spring 10 via a roller 10 the cam 7' assigned pivoting lever 8 is the other for variable stroke adjustment of the gas exchange valve 2 via a controlled by means of an adjustment 11 positionally adjustable and fixable Vibration pivot point 12 supported along a circular path.
  • the spring-loaded pivot lever 8 is supported at its ponderebahnfemen end via a rotatable about an axis 16 roller 17 against the housing side circular path 14 or backdrop 15 and by means of a cam 18 of the adjusting device 11 under the action of the spring 9 each fixed such that along a Equidistant 19 to the circular path 14 or backdrop 15 controlled displaceable axis 16 of the backdrop-side roller 17 serving in the respective variable stroke adjustment swing pivot point 12 of the pivot lever 8 forms.
  • the oscillating pivot point 12 of the pivot lever 8 forms an unchangeable instantaneous pole for a set, reduced stroke or for each stroke during the respective lifting operation.
  • an actual zero stroke of the gas exchange valve 2 can be realized, further results in a greater shortening of the control time at a stroke change of the gas exchange valve 2, delayed opening and closing courses accounted for partial strokes or reduce considerably, so that a greater maximum valve acceleration is advantageously achieved.
  • Next also results in an improved and increased torque curve at the full load of the internal combustion engine.
  • the link or circular path roller 17 of the pivot lever 8 is needle-mounted or roller-mounted on a rotatably connected to the pivot lever 8 pin 21.
  • cam roller 10 of the pivot lever 8 is also needle bearing, the same applies to the roller 5 of the transmission element. 3
  • a transmission element 3 a housing-side supported via a hydraulic valve clearance compensation device 22 roller cam follower 23 is provided, the role of which 5 with a control track 6 of the Swing lever 8 cooperates, which has a substantially designed for a constant lifting speed ramp 20 with a maximum valve clearance exceeding maximum stroke.
  • a tappet with a roller is also conceivable, and also a rocker arm with mechanically adjusted valve clearance.

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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 (6)

  1. Système de commande de soupape pour modifier la course d'une soupape d'échange gazeux à deux voies d'un moteur à combustion interne, dans lequel
    - la soupape d'échange gazeux (2) est avec interposition d'un élément de transmission (3) comportant un galet (5) mobile autour d'un axe de rotation (4), en relation active avec une piste de commande (6) comprenant une came de course à vide (6') et une came de course (6") dans une région d'extrémité d'un levier pivotant (8) commandé par une came (7') d'un arbre à cames (7) pour commander la course de la soupape d'échange gazeux (2), et
    - le levier pivotant (8) associé à la came (7') par une piste de came (galet de came 10) sous la charge d'un ressort s'appuie à l'autre extrémité le long d'une voie circulaire par un point de rotation oscillant (12) pouvant être fixé et commandé variable en position par un dispositif de réglage (11) pour modifier la course de la soupape,
    caractérisé en ce qu'
    - une trajectoire circulaire (14) disposée sur une partie de boîtier (13) du moteur à combustion interne sert de coulisse (15) avec un rayon (R) autour de l'axe de rotation (4) du galet (5) de l'élément de transmission (3) pour l'appui du levier pivotant (8) commandé variable en position et
    - la piste de commande (6) du levier pivotant (8) est formée, dans la région de transition entre la came de course à vide (6') et la came de course (6"), avec une rampe (20) réglée sur un jeu de soupape dans le système de commande de soupape (1).
  2. Système selon la revendication 1,
    caractérisé en ce que
    - le levier pivotant à ressort (8) est appuyé à son extrémité éloignée de la piste de commande, contre la trajectoire circulaire côté boîtier (14) respectivement la coulisse (15), par un galet (17) mobile en rotation autour d'un axe (16), et
    - peut être chaque fois fixé au moyen du dispositif de réglage (11), de telle manière que
    - l'axe (16) du galet côté coulisse (17), déplaçable par commande le long d'une ligne équidistante (19) à la trajectoire circulaire (14), forme le point de rotation oscillant (12) du levier pivotant (8) servant pour la modification variable de la course de la soupape.
  3. Système selon la revendication 2,
    caractérisé en ce que
    le galet de coulisse respectivement de trajectoire circulaire (17) du levier pivotant (8) est monté, par un roulement à aiguilles ou un roulement à rouleaux, sur un tourillon (21) solidaire en rotation avec le levier pivotant (8).
  4. Système selon une ou plusieurs des revendications 1 à 3,
    caractérisé en ce que
    - comme élément de transmission (3) un levier d'entraînement à galet (23) appuyé côté boîtier est prévu sur un dispositif de compensation hydraulique de jeu de soupape (22), et
    - la rampe (20) de la piste de commande (6), conçue sensiblement pour une vitesse de course constante, présente une course maximale dépassant le plus grand jeu possible de la soupape.
  5. Système selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce qu'
    un poussoir à boisseau avec un galet sert d'élément de transmission (3).
  6. Système selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce qu'
    un levier de soupape avec un jeu de soupape réglé mécaniquement sert d'élément de transmission (3).
EP02750861A 2001-05-12 2002-04-19 Systeme de commande de soupape pour modifier la course d'une soupape de gaz a deux voies d'un moteur a combustion Expired - Lifetime EP1387928B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10123186 2001-05-12
DE10123186A DE10123186A1 (de) 2001-05-12 2001-05-12 Ventiltrieb-Vorrichtung zur variablen Hubverstellung eines Gaswechselventils einer Brennkraftmaschine
PCT/EP2002/004332 WO2002092972A1 (fr) 2001-05-12 2002-04-19 Systeme de commande de soupape pour modifier la course d'une soupape de gaz a deux voies d'un moteur a combustion

Publications (2)

Publication Number Publication Date
EP1387928A1 EP1387928A1 (fr) 2004-02-11
EP1387928B1 true EP1387928B1 (fr) 2006-07-19

Family

ID=7684579

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Application Number Title Priority Date Filing Date
EP02750861A Expired - Lifetime EP1387928B1 (fr) 2001-05-12 2002-04-19 Systeme de commande de soupape pour modifier la course d'une soupape de gaz a deux voies d'un moteur a combustion

Country Status (7)

Country Link
US (1) US6907852B2 (fr)
EP (1) EP1387928B1 (fr)
JP (1) JP2004521234A (fr)
AT (1) ATE333571T1 (fr)
DE (2) DE10123186A1 (fr)
ES (1) ES2266537T3 (fr)
WO (1) WO2002092972A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015214115A1 (de) 2015-07-27 2017-02-02 Bayerische Motoren Werke Aktiengesellschaft Hubvariabler Ventiltrieb für eine Brennkraftmaschine
DE102018130428A1 (de) 2018-11-30 2020-06-04 Bayerische Motoren Werke Aktiengesellschaft Hubvariabler Ventiltrieb mit wenigstens zwei Arbeitslagen
WO2021115711A1 (fr) 2019-12-09 2021-06-17 Bayerische Motoren Werke Aktiengesellschaft Régulateur de levée pour un engrenage de vanne à levée variable à deux positions de travail

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WO2002092972A1 (fr) 2002-11-21
US20040144347A1 (en) 2004-07-29
EP1387928A1 (fr) 2004-02-11
ES2266537T3 (es) 2007-03-01
ATE333571T1 (de) 2006-08-15
DE50207568D1 (de) 2006-08-31
DE10123186A1 (de) 2002-11-14
US6907852B2 (en) 2005-06-21

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