EP0829620B1 - Arbre à cames réglable pour machine à pistons linéaires commandée par soupapes, en particulier pour moteur à combustion interne - Google Patents

Arbre à cames réglable pour machine à pistons linéaires commandée par soupapes, en particulier pour moteur à combustion interne Download PDF

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Publication number
EP0829620B1
EP0829620B1 EP97114533A EP97114533A EP0829620B1 EP 0829620 B1 EP0829620 B1 EP 0829620B1 EP 97114533 A EP97114533 A EP 97114533A EP 97114533 A EP97114533 A EP 97114533A EP 0829620 B1 EP0829620 B1 EP 0829620B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
cams
bearing
valves
axially
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
EP97114533A
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German (de)
English (en)
Other versions
EP0829620A2 (fr
EP0829620A3 (fr
Inventor
Adolf Fischer
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 EP0829620A2 publication Critical patent/EP0829620A2/fr
Publication of EP0829620A3 publication Critical patent/EP0829620A3/fr
Application granted granted Critical
Publication of EP0829620B1 publication Critical patent/EP0829620B1/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
    • F01L1/34413—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 composite camshafts, e.g. with cams being able to move relative to the camshaft

Definitions

  • the invention is based on the Japanese Patent publication Jp-Pat.-OS 59-183009.
  • This known adjusting camshaft is relative to one another on the camshaft cams with adjustable angles, on the one hand on the end faces on bearing blocks of the machine housing and on the other hand against each other are supported.
  • the angular adjustment of the two cams is relative to each other via projections engaging in grooves in the bearing bores of the cams on the Camshaft achieved, which is axially displaceable by means of a device.
  • the invention is based, for the generic adjusting camshaft the task to show an improved arrangement by means of which the production-related Deviations without an adverse influence on the axial positioning the cams are between the bearing arrangements or bearing blocks.
  • the advantage of this invention is that with a camshaft with between groups of angle adjustable Cams arranged bearing the light Distance of the bearing arrangements can no longer affect the axial play, the Influence of thermal expansion when the reciprocating machine is warm the axial play is minimized. This is not achieved with the variable camshaft according to FR-A-2 644 543.
  • each shaft-side guide element as a section a three-dimensional flat or trapezoidal thread is designed, and advantageously simplified arrangement on the camshaft of each thread section is in one piece with a respective bolt.
  • each guide element with a Bolt results in connection with one in the center in the longitudinal direction in the camshaft arranged lubricant-carrying channel
  • the guide elements fixing bolts penetrate the camshaft transversely are arranged, one emerging at one end of each bolt Distribution channel with a communicating with the longitudinal channel of the camshaft Inlet is connected.
  • the advantage of this embodiment according to the invention is a reliable lubrication of the angularly movable bearings on the camshaft Cam, with an over by the relatively close cams the lubricant film that builds up the shaft circumference and the lubrication of the Guiding elements in the grooves.
  • the bearing bushes with the front Grooves of the cam-covering flanges are formed.
  • Camshaft is further achieved in that between two adjacent bearing bushes arranged two axially spaced cams for first similar valves are, and between these a cam for second similar valves that are common are operated via a fork lever.
  • Another advantageous adjustment option furthermore results from the fact that the valves associated with the first identical valves Cams are designed differently and possibly grooves with different Have pitch angles. This arrangement allows between Cams for similar valves an additional spread change, too Phasing called, also different valve opening times as well Different valve strokes to advantageously influence the gas dynamics Internal combustion engine on the intake side.
  • An additional adjustment option opens up in a further embodiment of the Invention in that a further adjustment device for changing the relative Rotational position of the camshaft relative to a crankshaft of the internal combustion engine is provided, with this adjusting device in combination with the change in spread the angle-adjustable cams the opening and closing times of the different valves can also be changed.
  • the one adjusting device for angular adjustment of the cams relative to each other one camshaft end is provided and that the other adjusting device to change the relative camshaft rotational position at the other end of the camshaft is arranged with the thrust bearing, this shaft end section via straight teeth and the thrust bearing via helical or screw teeth each axially adjustable with a corresponding toothing controlled / regulated sliding sleeve cooperates.
  • both adjustment devices each have a worm gear comprise, each worm with one arranged transversely to the camshaft Servomotor in drive connection, and being the worm wheels each by means of a non-rotating axial sliding sleeve, each with a roller bearing on the axially displaceable camshaft or the axially adjustable rotational position sliding sleeve act.
  • the adjacent cams 3, 3 'and 4 between end faces 6 of on the camshaft 1 separately provided and divided into recesses 7 bearing blocks 5 axially protruding bearing bushes 8 axially positioned.
  • the bearing bushes 8 are made of a material with a material of the cylinder head 2 or the bearing blocks 5 have the same or similar thermal expansion value educated.
  • some bearing bushes 8 arranged with a sliding fit in the recesses 7 of the bearing blocks 5 be and one or the other bearing bush 8 in the recess 7 of the respective Bearing block 5 to be kept jammed.
  • this is for angular adjustment the cams 3, 3 'and 4 to change the cam spread by means of an adjusting device 9 arranged axially displaceably in the bearing bushes 8, wherein a bearing bush 8 in a final bearing arrangement forms a track bearing 10, on the one hand with a drive flange 11 for a drive wheel 12 of a camshaft rotary drive 13 and, on the other hand, can be moved by means of a profile with the Camshaft 1 is in a rotationally fixed connection.
  • each Combustion chamber cap 14 in the cylinder head 2 are on the camshaft 1 between two adjacent bearing bushes 8 on both sides of an exhaust cam 4 intake cams 3, 3 'arranged, the axially with each other, for example, over Teflon Metal discs slidably connected cams 3, 3 'and 4 in their Bores 15 arranged with differently directed pitch angles Have grooves 16, in the separately arranged on the outer circumference of the camshaft 1 Intervene guide elements 17.
  • each shaft side Guide element 17 as a section of a three-dimensional flat or trapezoidal thread designed with each thread section as a guide element 17 is in one piece with a respective bolt 18.
  • the lubrication system the internal combustion engine or the cylinder head 2 introduced into the longitudinal channel 19 Lubricant via the pin 18 between the camshaft 1 and Bores 15 of the cams 3, 3 'and 4 introduced. Due to the relatively close together Cam 3, 3 'and 4 is installed in their bearing holes 15 closed lubricating film, the lubrication of the guide elements 17 in the grooves 16 takes over. To prevent an inadmissible lubricant drain To avoid the guide grooves 16, the bearing bushes 8 are with the front Grooves 16 of the cams 3, 3 'covering flanges 22 are formed.
  • a further adjustment device 24 is provided to expand the adjustment options to change the relative rotational position of the adjusting camshaft 1 compared to one Crankshaft of the internal combustion engine, not shown, is provided.
  • the an adjusting device 9 for angular adjustment of the cams 3, 3 'and 4 relative to each other is provided at one camshaft end 25 and that the other Adjustment device 24 for changing the relative camshaft rotational position on the other Camshaft end is arranged with the thrust bearing 10, this shaft end portion 26 via a spur gear 27 and the thrust bearing 10 via a Helical or helical teeth 28 each with a corresponding toothing cooperates on a controllably adjustable sliding sleeve 29.
  • both adjustment devices 9 and 24 each comprise a self-locking worm gear 30 or 31, each worm 32 or 33 with a transverse to the variable camshaft 1 arranged servomotor 34 or 35 is in drive connection.
  • the worm wheels 36 and 37 each act by means of a non-rotating Axialschiebehülse 38 or 39 via a roller bearing 40 or 41 on the axial slidable camshaft 1 or the axially adjustable rotary position sliding sleeve 29 a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (11)

  1. Arbre à cames réglable pour un moteur à pistons linéaires commandé par soupapes, notamment un moteur à combustion interne selon lequel :
    un arbre à cames (1) cylindrique, coulissant axialement, porte des cames (3, 3', 4) réglables angulairement l'une par rapport à l'autre par des liaisons de forme (16, 17) mobiles en glissement,
    des cames (3, 3', 4) voisines, s'appuyant axialement l'une contre l'autre, sont maintenues en place axialement vis-à-vis de l'arbre à cames (1) coulissant axialement par des dispositifs de paliers (5) d'arbres à cames (1) répartis sur le moteur, et
    les cames voisines (3, 3', 4) sont maintenues en place par les faces frontales (6) de coussinets (8), dépassant axialement des dispositifs de paliers (5) et montés dans les cavités (7) des dispositifs de paliers (5) répartis sur le moteur,
    caractérisé en ce que
    les coussinets (8) qui reçoivent l'arbre à cames (1) de manière mobile en rotation et en coulissement sont réalisés en un matériau ayant un coefficient de dilatation thermique égal ou analogue à celui des dispositifs de paliers (5), répartis sur le moteur.
  2. Arbre à cames selon la revendication 1,
    caractérisé en ce que
    l'arbre à cames (1) est monté coulissant axialement dans des coussinets (8) par l'intermédiaire d'un dispositif d'actionnement (9) pour le réglage angulaire des cames (3, 3', 4), et
    un coussinet (8) d'un dispositif de palier d'extrémité forme une crapaudine (10) qui,
    d'un côté, est en liaison solidaire en rotation avec une bride d'entraínement (11) d'un moyen d'entraínement en rotation (13) de l'arbre à cames, et
    de l'autre côté, est solidaire en rotation mais mobile en coulissement avec l'arbre à cames (1) par un profil.
  3. Arbre à cames selon la revendication 1 ou 2,
    caractérisé en ce qu'
    au moins une came d'admission (3, 3') et une came d'échappement (4) sont montées de manière réglable angulairement sur l'arbre à cames (1) entre deux coussinets (8) voisins,
    les cames (3, 3', 4), qui coopèrent entre elles de manière mobile en glissement axial, comportent, dans leur alésage (15), des rainures (16) de pas différents, recevant des éléments de guidage (17) particuliers prévus à la périphérie de l'arbre à cames (1).
  4. Arbre à cames selon les revendications 1 à 3,
    caractérisé en ce que
    les rainures (16) des cames (3, 3', 4) ont une forme hélicoïdale,
    chaque élément de guidage (17) du côté de l'arbre est constitué par un segment de filet de vis tridimensionnel, plat ou trapézoïdal, et
    chaque segment de filet de vis est réalisé en une seule pièce comme élément de guidage (17) avec un goujon (18) respectif.
  5. Arbre à cames selon l'une des revendications 1 à 4,
    caractérisé en ce que
    un canal d'agent de graissage (19) traverse longitudinalement l'axe de l'arbre à cames (1),
    les goujons (18), qui bloquent les éléments de guidage (17) passent transversalement dans l'arbre à cames (1), et
    de l'extrémité de chaque goujon (18), sort librement un canal de distribution (20) qui communique avec une alimentation (21) reliée au canal longitudinal (19) de l'arbre à cames (1).
  6. Arbre à cames selon les revendications 1 à 5,
    caractérisé en ce que
    les coussinets (8) ont des brides (22) qui recouvrent frontalement les rainures (16) des cames (3, 3', 4).
  7. Arbre à cames selon l'une des revendications 1 à 6,
    caractérisé en ce qu'
    entre deux coussinets (8) voisins pour des premières soupapes de même type (soupapes d'admission 23), on a deux cames écartées axialement (cames d'admission 3, 3') et, entre celles-ci, il y a une came (4) pour deux secondes soupapes de même type (soupapes d'échappement) qui sont actionnées en commun par un levier en forme de fourchette.
  8. Arbre à cames selon l'une des revendications 1 à 7,
    caractérisé en ce que
    les cames associées aux premières soupapes de même type (soupapes d'admission 23) (cames d'admission 3, 3') sont de formes différentes, et
    elles ont, le cas échéant, des rainures (16) avec des pas différents.
  9. Arbre à cames selon l'une des revendications 1 à 8,
    caractérisé en ce qu'
    un autre dispositif d'actionnement (24) modifie la position de rotation relative de l'arbre à cames (1) par rapport au vilebrequin du moteur à combustion interne.
  10. Arbre à cames selon l'une des revendications 1 à 9,
    caractérisé en ce qu'
    un dispositif d'actionnement (9), assurant le réglage angulaire des cames (3, 3', 4) l'une par rapport à l'autre, est prévu à une extrémité d'arbre (25),
    l'autre dispositif d'actionnement (24) pour modifier la position de rotation relative de l'arbre à cames est prévu à l'autre extrémité de l'arbre à cames avec une crapaudine (10), et
    le segment d'extrémité d'arbre (26) par une denture droite (27), et la crapaudine (10) par une denture en biais ou en hélice (28), coopèrent chaque fois avec une denture correspondante d'un manchon coulissant (29) actionné, commandé/réglé.
  11. Arbre à cames selon l'une des revendications 1 à 10,
    caractérisé en ce que
    les deux dispositifs d'actionnement (9, 24) comportent chacun une transmission à vis autobloquante (30, 31),
    chaque vis (32, 33) coopère à l'entraínement avec un moteur-actionneur (34, 35) transversal à l'arbre à cames (1), et
    les roues à vis (36, 37) agissent chaque fois par l'intermédiaire d'un manchon coulissant axialement (38, 39), bloqué en rotation, par un palier de roulement (40, 41) sur l'arbre à cames (1) coulissant axialement ou sur le manchon coulissant de palier de rotation (29) réglable axialement.
EP97114533A 1996-09-13 1997-08-22 Arbre à cames réglable pour machine à pistons linéaires commandée par soupapes, en particulier pour moteur à combustion interne Expired - Lifetime EP0829620B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19637416 1996-09-13
DE19637416A DE19637416A1 (de) 1996-09-13 1996-09-13 Verstell-Nockenwelle für eine ventilgesteuerte Hubkolbenmaschine, insbesondere Brennkraftmaschine

Publications (3)

Publication Number Publication Date
EP0829620A2 EP0829620A2 (fr) 1998-03-18
EP0829620A3 EP0829620A3 (fr) 1998-04-08
EP0829620B1 true EP0829620B1 (fr) 2000-07-12

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Application Number Title Priority Date Filing Date
EP97114533A Expired - Lifetime EP0829620B1 (fr) 1996-09-13 1997-08-22 Arbre à cames réglable pour machine à pistons linéaires commandée par soupapes, en particulier pour moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0829620B1 (fr)
DE (2) DE19637416A1 (fr)
ES (1) ES2148883T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6439180B2 (en) 2000-01-21 2002-08-27 Dr. Ing. H.C.F. Porsche Ag Cylinder head for a valve-controlled internal combustion engine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19646934A1 (de) 1996-11-13 1998-05-14 Bayerische Motoren Werke Ag Verstell-Nockenwelle, insbesondere für ventilgesteuerte Brennkraftmaschinen
DE19823316A1 (de) * 1998-05-26 1999-12-02 Volkswagen Ag Buchse mit Flansch und Verfahren zu deren Herstellung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59183009A (ja) * 1983-03-31 1984-10-18 Suzuki Motor Co Ltd ４サイクルエンジンのバルブタイミング可変装置
FR2644543A1 (fr) * 1989-03-17 1990-09-21 Renault
DE4226798A1 (de) * 1992-08-13 1994-02-24 Bayerische Motoren Werke Ag Hubkolben-Brennkraftmaschine mit zwei Gaswechselventilen je Zylinder
DE4331977A1 (de) * 1993-09-21 1995-03-23 Porsche Ag Variable Ventilsteuerung
DE4416505A1 (de) * 1994-05-10 1995-11-16 Bayerische Motoren Werke Ag Nockenwelle mit verdrehbaren Nocken

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6439180B2 (en) 2000-01-21 2002-08-27 Dr. Ing. H.C.F. Porsche Ag Cylinder head for a valve-controlled internal combustion engine

Also Published As

Publication number Publication date
ES2148883T3 (es) 2000-10-16
DE59702000D1 (de) 2000-08-17
DE19637416A1 (de) 1998-03-19
EP0829620A2 (fr) 1998-03-18
EP0829620A3 (fr) 1998-04-08

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