EP0739444B1 - Mecanisme de distribution a programme variable - Google Patents

Mecanisme de distribution a programme variable Download PDF

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Publication number
EP0739444B1
EP0739444B1 EP95905179A EP95905179A EP0739444B1 EP 0739444 B1 EP0739444 B1 EP 0739444B1 EP 95905179 A EP95905179 A EP 95905179A EP 95905179 A EP95905179 A EP 95905179A EP 0739444 B1 EP0739444 B1 EP 0739444B1
Authority
EP
European Patent Office
Prior art keywords
drive
camshaft
valve
drive mechanism
lever
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
EP95905179A
Other languages
German (de)
English (en)
Other versions
EP0739444A1 (fr
Inventor
Thomas Tsoi Hei Ma
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.)
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
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 Ford Werke GmbH, Ford France SA, Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Werke GmbH
Publication of EP0739444A1 publication Critical patent/EP0739444A1/fr
Application granted granted Critical
Publication of EP0739444B1 publication Critical patent/EP0739444B1/fr
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
    • F01L13/0057—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 splittable or deformable cams

Definitions

  • the present invention relates to a variable valve timing mechanism for an internal combustion engine.
  • WO 92/04532 uses a coil spring as the coupling member that jams against a pad when it is unwound and takes up the lost motion by winding up. Though this construction reduced the noise problem significantly, impact shock was still excessive causing the spring to fracture.
  • the present invention seeks to provide a variable valve timing mechanism which introduces lost motion into the valve train but which mitigates noise and wear problems.
  • a drive mechanism for transmitting driving torque from the crankshaft to a camshaft of an internal combustion engine comprising concentric drive and driven members connectable respectively to the crankshaft and the camshaft, and a spring biased lost motion coupling acting between the drive and the drive members to permit a limited degree of change in the phase of the driven member relative to the drive member, the lost motion coupling acting when in use in such a manner that during the opening of each engine valve by the camshaft, the driven member rotates at substantially the same speed as the drive member and during the closing of each engine valve the driven member may be accelerated by the valve spring to lead the drive member and thereby reduce the duration of each engine valve event by altering the closing timing of each valve, characterised in that the lost motion coupling comprises a lever pivotably supported on one of the members and having a force transmitting surface that is biased by a spring to remain in contact at all times with a reaction surface on the other member, the position of the point of contact between the two surfaces being dependent upon the relative angular position
  • the surface of the lever and the reaction surface with which it makes contact are profiled in such a manner that the surface of the lever rolls without slipping on the reaction surface. This avoids wear due to friction and reduces the lubrication requirements of the mechanism.
  • the strength of the valve springs and the friction on the valve train determine the applied torque to effect the phase change and the rate of change of the phase during such torque reversal will also depend upon the moment of inertia of the drive mechanism.
  • the amplitude of the phase change i.e. the extent to which the duration of the valve event is reduced, further depends on the time that the torque acts, in other words upon the engine speed.
  • the valve springs and the moment of inertia are constant and the extent of variation will vary only and automatically with engine speed, assuming no change in friction. It is possible to apply a variable drag between the drive and driven members, for example by the use of a magnetic clutch, to reduce the phase change occurring at any given engine speed.
  • a drive mechanism comprises a driven member 10 connected to the camshaft 12 of an engine and a drive member 14 driven through a belt 16 by the engine crankshaft.
  • the drive member 14 is journalled about the camshaft 12 and can rotate relative to it.
  • the coupling between the drive and driven members 14 and 10 is effected by means of pins 18 in the driven member 10 about which there are pivoted two levers 20 that are both biased to rotate in a clockwise direction as viewed in Figure 1 by helical springs 22.
  • the pins 18 and levers 20 are located within a deep recess in the drive member 14 bounded by reaction surfaces 24 against which the levers 20 are urged by the springs 22.
  • An electromagnetic clutch 30 is included to apply a controllable drag between the drive and driven members 14 and 10.
  • a disk 32 is formed in close proximity to the drive member 14 and fixed for rotation with the camshaft 12 and an electromagnet 34 powered by a suitable control circuit 36 can apply a variable magnetic field to a thin film of magnetic fluid 38 disposed between the disk 32 and the drive member 14.
  • the purpose of the clutch 30 is to apply a variable drag between the drive and driven members 14 and 10 to moderate the extent of phase change at any given engine speed.
  • the illustrated embodiment incorporates a position sensor 40 that provides a position feedback signal to the control circuit 36 so that the phase change can be accurately closed loop controlled.
  • both surface may be curved or the reaction surfaces alone may be curved.

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)

Claims (5)

  1. Mécanisme d'entraínement pour transmettre un couple d'entraínement à partir du vilebrequin à un arbre à came (12) d'un moteur à combustion interne, comprenant des éléments d'entraínement et mené (14, 10) respectivement accouplables au vilebrequin et à l'arbre à came (12), et un accouplement à mouvement à vide sollicité par ressort agissant entre les éléments d'entraínement et mené (14, 10) pour permettre un degré de changement limité de la phase de l'élément mené (10) par rapport à l'élément d'entraínement (14), l'accouplement à mouvement à vide agissant, lorsqu'en utilisation, d'une manière telle que pendant l'ouverture de chaque soupape du moteur par l'arbre à came, l'élément mené (10) tourne à pratiquement la même vitesse que l'élément d'entraínement (14) et pendant la fermeture de chaque soupape du moteur, l'élément mené (10) peut être accéléré par le ressort de soupape pour avancer l'élément d'entraínement (14) et réduire de ce fait la durée de chaque déplacement de soupape du moteur en modifiant l'instant de fermeture de chaque soupape, caractérisé en ce que l'accouplement à mouvement à vide comprend un levier (20) supporté à pivoter sur un des éléments (14, 10) et ayant une surface de transmission de force qui est sollicitée par un ressort (22) pour rester en contact à tout instant avec une surface de réaction (24) sur l'autre élément, la position du point de contact entre les deux surfaces étant fonction de la position angulaire relative des éléments d'entraínement et mené (14, 10) et étant fonctionnelle pour se déplacer progressivement afin de faire varier l'avantage mécanique du levier (20) à mesure que les éléments tournent l'un par rapport à l'autre sous l'action des inversions de couple sur l'arbre à came.
  2. Mécanisme d'entraínement selon la revendication 1, dans lequel deux leviers (20) agissant contre deux surfaces de réaction opposées (24) sont placés symétriquement autour de l'axe de rotation du mécanisme d'entraínement.
  3. Mécanisme d'entraínement selon la revendication 1 ou 2, dans lequel la surface du levier ou de chaque levier (20) et de la surface de réaction (24) avec laquelle il entre en contact sont profilées d'une manière telle que la surface du levier roule sans coulissement sur la surface de réaction (24).
  4. Mécanisme d'entraínement selon l'une quelconque des revendications précédentes, comprenant de plus un moyen (30) pour appliquer une résistance variable entre les éléments d'entraínement et mené pour diminuer l'étendue du changement de phase pendant l'inversion du couple à toute vitesse du moteur donnée.
  5. Mécanisme d'entraínement selon la revendication 4, dans lequel le moyen pour appliquer une résistance (30) comprend un capteur de position (40) pour détecter l'étendue du changement de phase pendant l'inversion du couple afin de permettre la commande par boucle fermée de la résistance ou de l'entraínement.
EP95905179A 1994-01-15 1994-12-15 Mecanisme de distribution a programme variable Expired - Lifetime EP0739444B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9400748A GB2285671A (en) 1994-01-15 1994-01-15 Variable valve timing mechanism
GB9400748 1994-01-15
PCT/GB1994/002797 WO1995019493A1 (fr) 1994-01-15 1994-12-15 Mecanisme de distribution a programme variable

Publications (2)

Publication Number Publication Date
EP0739444A1 EP0739444A1 (fr) 1996-10-30
EP0739444B1 true EP0739444B1 (fr) 1998-06-17

Family

ID=10748875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95905179A Expired - Lifetime EP0739444B1 (fr) 1994-01-15 1994-12-15 Mecanisme de distribution a programme variable

Country Status (4)

Country Link
EP (1) EP0739444B1 (fr)
DE (1) DE69411193T2 (fr)
GB (1) GB2285671A (fr)
WO (1) WO1995019493A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005024485A1 (de) * 2005-05-27 2006-11-30 Daimlerchrysler Ag Nockenwelleneinheit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992004532A1 (fr) * 1990-09-12 1992-03-19 Ford Motor Company Limited Moteur a combustion interne a phases de distribution variables

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB884434A (en) * 1958-11-29 1961-12-13 Bosch Gmbh Robert Improvements in or relating to hydraulically adjustable rotary couplings
DE3234640A1 (de) * 1982-09-18 1984-03-22 Volkswagenwerk Ag, 3180 Wolfsburg Ventiltrieb, insbesondere fuer eine brennkraftmaschine
DE4026480C2 (de) * 1989-08-31 1998-07-23 Volkswagen Ag Nockenwelle, insbesondere für Ladungswechselventile einer Brennkraftmaschine, mit zumindest einem Schwenknocken

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992004532A1 (fr) * 1990-09-12 1992-03-19 Ford Motor Company Limited Moteur a combustion interne a phases de distribution variables

Also Published As

Publication number Publication date
GB2285671A (en) 1995-07-19
EP0739444A1 (fr) 1996-10-30
DE69411193D1 (de) 1998-07-23
WO1995019493A1 (fr) 1995-07-20
DE69411193T2 (de) 1999-03-11
GB9400748D0 (en) 1994-03-16

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