EP0518898B1 - Dispositif d'entrainement d'arbre a came - Google Patents

Dispositif d'entrainement d'arbre a came Download PDF

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Publication number
EP0518898B1
EP0518898B1 EP91904642A EP91904642A EP0518898B1 EP 0518898 B1 EP0518898 B1 EP 0518898B1 EP 91904642 A EP91904642 A EP 91904642A EP 91904642 A EP91904642 A EP 91904642A EP 0518898 B1 EP0518898 B1 EP 0518898B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
pair
gears
switching element
drive wheel
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
EP91904642A
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German (de)
English (en)
Other versions
EP0518898A1 (fr
Inventor
Richard Clos
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.)
Audi AG
Original Assignee
Audi 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 Audi AG filed Critical Audi AG
Publication of EP0518898A1 publication Critical patent/EP0518898A1/fr
Application granted granted Critical
Publication of EP0518898B1 publication Critical patent/EP0518898B1/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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/34403—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using helically teethed sleeve or gear moving axially between crankshaft and camshaft
    • F01L1/34406—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using helically teethed sleeve or gear moving axially between crankshaft and camshaft the helically teethed sleeve being located in the camshaft driving pulley
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L2001/34486—Location and number of the means for changing the angular relationship

Definitions

  • the invention relates to a drive device for a camshaft according to the preamble of claim 1.
  • Such a drive device is described for example in DE-A 19 63 549.
  • the invention has for its object to provide a camshaft drive device of the generic type, the longitudinal extent of which is only extremely slightly greater than the longitudinal extent of a drive device without a camshaft adjusting device.
  • the switching element can be actuated hydraulically by a servomotor, for example in accordance with DE-A 19 63 549 mentioned at the beginning, in which part of the switching element forms a hydraulic piston.
  • a servomotor adjacent to the end of the camshaft facing away from the drive wheel and to connect the actuator of the servomotor to the shifting element by means of a shift rod passing through the camshaft.
  • the servomotor comes with a longitudinally installed internal combustion engine at a point in the engine compartment at which the bonnet rises towards the windshield, so that there is sufficient space for accommodating the servomotor.
  • Fig. 1 denotes the cylinder head of a valve-controlled reciprocating piston internal combustion engine, in which a camshaft 3 is supported via bearings 2, the cams of which actuate intake and / or exhaust valves, not shown, of the internal combustion engine.
  • a tubular extension 4 is screwed to the camshaft 3 by screws 4a, on which a drive wheel 5 is mounted, which is driven by the crankshaft of the internal combustion engine.
  • the holes 4b in the extension 4, through which the screws 4a extend, are designed as elongated holes in order to enable a basic setting of the camshaft 3 relative to the drive wheel 5.
  • a switching element 6 is used, which is non-rotatably connected to the drive wheel via a first pair of teeth 7, 9 and non-rotatably connected to the camshaft extension 4 via a second pair of teeth 8, 11.
  • the pairs of teeth 7, 9 and 8, 11 close different angles the longitudinal central axis of the camshaft 3.
  • the pair of teeth 7, 9 is designed as a straight toothing and the pair of teeth 8, 11 as a helical toothing.
  • the pair of teeth 7, 9 could also be designed as helical teeth and the pair of teeth 8, 11 as straight teeth.
  • axial displacement of the control element 6 causes the camshaft 3 to rotate relative to the drive wheel 5 and thus a change in the valve timing.
  • the axial displacement of the switching element 6 takes place with the aid of a servomotor 15 arranged at the other end of the camshaft 3, the actuator of which in the exemplary embodiment is a hydraulic piston 16 ', is connected to the switching element 6 by a switching rod 17 which penetrates a through hole 18 of the camshaft 3.
  • the switching element 6 is moved from one end position to the other by pressure loading one side of the actuating piston 16 and relieving the pressure on the other piston surface by means of a control slide 20 actuated, for example, by an electromagnet 19.
  • the switchover can take place as a function of operating parameters.
  • the switching rod 17 can be connected to the switching element 6 and to the actuating piston 16 such that they can move in an angular manner.
  • the servomotor 15 is connected in a rotationally fixed manner to the camshaft 3 in the exemplary embodiment.
  • an axial bearing for the camshaft which is required in a stationary servomotor for absorbing the axial actuating forces, is avoided.
  • the pressure medium supply and discharge to the right in FIG. 2 of the actuating piston 16 takes place via the camshaft bearing 2 'and a bore 21 in the camshaft 3 through the hollow shift rod 17 and the hollow screw 22, which connects the actuating piston 16 to the shift rod 17.
  • the pressure medium supply and discharge to or from the left side of the actuating piston 16 also takes place through the camshaft bearing 2 'and a second bore 23 in the camshaft and an annular space 24 between the shift rod 17 and the wall of the through bore 18.
  • a sleeve 25 is pressed into the through hole 18.
  • the switching element 6 is arranged in the tubular camshaft extension 4 and, as can be seen in particular in FIG. 3, the outer teeth 7 of the first pair of teeth and the outer teeth 8 of the second pair of teeth are alternately provided on its circumference.
  • the external toothing 7 is formed by straight toothing extending in the longitudinal direction of the camshaft 3
  • the external toothing 8 is formed by helical toothing sectors which are arranged between adjacent straight toothing sectors 7.
  • Corresponding internal helical gear segments 11 on the inner circumference of the tubular camshaft extension 4 engage with the helical gear sectors 8.
  • This camshaft extension 4 is provided between the segments 11 with openings 10, through which spokes 12 of the drive wheel 5 extend, which engage with the straight-toothed sectors 7 with their straight-toothed ends 9.
  • the spokes 12 are arranged in the openings 10 with such a large circumferential play that the desired angular adjustment of the camshaft 3 relative to the drive wheel 5 is made possible.
  • the helical toothing 7 of the switching element 6 has a larger pitch circle diameter than the straight toothing 8. This enables the helical toothing by hobbing as there is a side outlet for the milling tool.
  • Straight teeth can be made by broaching or butting.
  • the switching element can also be a sintered body in which at least the straight toothing is sintered.

Landscapes

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

Abstract

Un dispositif d'entraînement d'un arbre à came (3) d'un moteur à combustion interne comprend un élément qui met en rotation l'arbre à came (3) par rapport à une roue axiale (5) d'entraînement pourvue d'un élément commutateur (6) qui coopère avec la roue d'entraînement au moyen d'une première paire de dentures droites (7, 9), qui coopère avec l'arbre à came (3) au moyen d'une deuxième paire de dentures hélicoïdales (8, 11) et qui peut être axialement déplacé par un moteur de réglage. Les dentures des paires de dentures agencées entre l'élément commutateur (6) et la roue d'entraînement (5) d'une part et entre l'élément commutateur (6) et l'arbre à came (3) d'autre part sont agencées les unes derrières les autres dans le sens circonférentiel, c'est-à-dire une paire de dentures agencées entre l'élément commutateur (6) et la roue d'entraînement (5) suit dans le sens circonférentiel une paire de dentures agencées entre l'élément de réglage (6) et l'arbre à came (3). Par conséquent, le réglage de l'arbre à came nécessite un espace minime.

Claims (6)

  1. Dispositif d'entraînement pour un arbre à cames (3) monté dans la culasse de cylindre (1) d'un moteur à combustion interne, comprenant un dispositif pour la mise en rotation de l'arbre à cames par rapport à une roue de commande (5) coaxiale solidaire en entraînement avec le vilebrequin du moteur à combustion interne, laquelle comporte un élément de commutation (6) monté coaxialement par rapport à l'arbre à cames (3) et axialement déplaçable par un servomoteur entre deux positions de fin de course, qui coopère avec la roue de commande (5) par l'intermédiaire d'une première paire de dentures (7, 9) et avec l'arbre à cames (3) par l'intermédiaire d'une seconde paire de dentures (8, 11), chaque paire de dentures se composant d'une denture extérieure (7 ou 8) prévue sur l'élément de commutation (6) et d'une denture intérieure (9 ou 11) prévue sur la roue de commande (5) et respectivement dans l'arbre à cames (3), les deux paires de dentures formant avec l'axe central longitudinal de l'arbre à cames des angles différents, et la roue de commande (5) étant montée de manière tournante sur un prolongement (4) tubulaire de l'arbre à cames (3), caractérisé en ce que
    a) l'élément de commutation (6) est disposé dans le prolongement (4) de l'arbre à cames et que sa périphérie porte alternativement la denture extérieure (7) de la première paire de dentures (7, 9) et la denture extérieure (8) de la seconde paire de dentures (8, 11),
    b) la paroi périphérique du prolongement (4) tubulaire de l'arbre à cames présente des ajours (10) et, entre lesdits ajours, des segments de denture intérieure (11) qui coopèrent avec les dentures extérieures (8) de la seconde paire de dentures sur l'élément de réglage (6),
    c) la roue de commande (5) présente des rayons (12) qui s'étendent radialement vers l'intérieur au travers des ajours (10) et dont les extrémités (9) coopèrent avec les dentures extérieures (7) de la première paire de dentures (7, 9) sur l'élément de réglage (6), les rayons (12) étant disposés dans les ajours (10) avec un jeu dans le sens circonférentiel qui correspond à l'angle de rotation nécessaire entre l'arbre à cames (3) et la roue de commande (5).
  2. Dispositif d'entraînement selon la revendication 1, caractérisé en ce que la première paire de dentures (7, 9) est conformée à la manière d'une denture d'arbre cannelé, les rayons (12) s'engageant avec leurs extrémités (9) radialement intérieures dans des dentures droites (7) dans la surface périphérique de l'élément de commutation (6), entre des dentures extérieures (8) voisines de la seconde paire de dentures (8, 11).
  3. Dispositif d'entraînement selon la revendication 1, caractérisé en ce que le servomoteur (15) est monté au voisinage de l'extrémité de l'arbre à cames (3) opposée à la roue de commande (5), et que l'organe de réglage (16) du servomoteur (15) est couplé avec l'élément de commutation (6) par une tringle de commande (17) qui traverse l'arbre à cames (3).
  4. Dispositif d'entraînement selon la revendication 3, caractérisé en ce que la tringle de commande (17) est couplée de manière mobile quant à la position angulaire avec l'élément de commutation (6) et/ou l'organe de réglage (16).
  5. Dispositif d'entraînement selon la revendication 3, caractérisé en ce que le servomoteur (15), l'organe de réglage (16) et la tringle de commande (17) sont solidaires en rotation de l'arbre à cames (3).
  6. Dispositif d'entraînement selon la revendication 1, caractérisé en ce que le prolongement (4) tubulaire peut être bloqué dans différentes positions angulaires de l'arbre à cames (3).
EP91904642A 1990-03-07 1991-02-25 Dispositif d'entrainement d'arbre a came Expired - Lifetime EP0518898B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007181A DE4007181A1 (de) 1990-03-07 1990-03-07 Antriebsvorrichtung fuer eine nockenwelle
DE4007181 1990-03-07

Publications (2)

Publication Number Publication Date
EP0518898A1 EP0518898A1 (fr) 1992-12-23
EP0518898B1 true EP0518898B1 (fr) 1993-08-04

Family

ID=6401625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91904642A Expired - Lifetime EP0518898B1 (fr) 1990-03-07 1991-02-25 Dispositif d'entrainement d'arbre a came

Country Status (3)

Country Link
EP (1) EP0518898B1 (fr)
DE (2) DE4007181A1 (fr)
WO (1) WO1991014082A2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04350311A (ja) * 1990-12-28 1992-12-04 Atsugi Unisia Corp 内燃機関のバルブタイミング制御装置
JPH0547309U (ja) * 1991-11-28 1993-06-22 株式会社ユニシアジェックス 内燃機関のバルブタイミング制御装置
DE10211468A1 (de) * 2002-03-15 2003-09-25 Daimler Chrysler Ag Nockenwellenversteller für eine Brennkraftmaschine
US6883479B2 (en) 2002-11-04 2005-04-26 Borgwarner Inc. VCT phaser having an electromagnetic lock system for shift and lock operation
US6814037B1 (en) * 2003-06-24 2004-11-09 Borgwarner Inc. Variable camshaft timing for internal combustion engine with actuator locking
DE10346446A1 (de) * 2003-10-07 2005-05-12 Daimler Chrysler Ag Nockenwellenversteller für eine Brennkraftmaschine mit Hydraulikmittelführungen
DE102005039751A1 (de) * 2005-08-23 2007-03-01 Mahle International Gmbh Nockenwelle
CN101737110B (zh) * 2009-12-15 2011-11-16 重庆大学 摩托车发动机单顶置凸轮轴进气相位连续可变机构
FR3060645B1 (fr) * 2016-12-19 2018-11-30 Renault S.A.S. Arbre a cames comportant un systeme de dephasage
US11280228B2 (en) * 2020-07-07 2022-03-22 Borgwarner, Inc. Variable camshaft timing assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE900505C (de) * 1943-11-06 1953-12-28 Bosch Gmbh Robert Spritzbeginn- oder Zuendzeitpunkt-Versteller fuer Brennkraftmaschinen
IT1152959B (it) * 1982-05-17 1987-01-14 Alfa Romeo Spa Dispositivo per la variazione automatica della fasatura di un albero a camme
NL8301347A (nl) * 1983-04-18 1984-11-16 Ernst Bernhard Leopold Laqueui Voertuig-turbomotor met groter cylindervermogen, lager brandstofverbruik en krachtiger acceleratie-eigenschappen.
DE3503740A1 (de) * 1985-02-05 1986-08-07 Miklos Dipl.-Ing. 6800 Mannheim Csongrady Vorrichtung zur veraenderung der steuerzeiten bei ventilgesteuerten verbrennungsmotoren

Also Published As

Publication number Publication date
WO1991014082A2 (fr) 1991-09-19
WO1991014082A3 (fr) 1991-10-31
DE4007181A1 (de) 1991-09-12
DE59100260D1 (de) 1993-09-09
EP0518898A1 (fr) 1992-12-23

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