EP0643200A1 - Internal combustion engine camshaft - Google Patents

Internal combustion engine camshaft Download PDF

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Publication number
EP0643200A1
EP0643200A1 EP94401975A EP94401975A EP0643200A1 EP 0643200 A1 EP0643200 A1 EP 0643200A1 EP 94401975 A EP94401975 A EP 94401975A EP 94401975 A EP94401975 A EP 94401975A EP 0643200 A1 EP0643200 A1 EP 0643200A1
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EP
European Patent Office
Prior art keywords
cams
sleeve
shaft
inner shaft
engine
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.)
Withdrawn
Application number
EP94401975A
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German (de)
French (fr)
Inventor
Patrick Gallard
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0643200A1 publication Critical patent/EP0643200A1/en
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a camshaft for an internal combustion engine intended in particular to equip a motor vehicle. It relates more particularly to a composite type camshaft comprising two interlocked shafts which can be angularly displaced with respect to each other, by a given angular value, each of these shafts supporting cams of which they are integral in rotation .
  • phase shift of the valve opening periods can be achieved relatively simply when the exhaust and intake valves of an internal combustion engine are associated with individual camshafts. This is more difficult if the opening of the intake and exhaust valves is ensured by a single camshaft.
  • European patent EP-A-254,058 discloses a camshaft of the composite type, therefore comprising two shafts rotatably mounted concentrically with one another, one of which is integral with the cams controlling the opening of the valves intake and the other, cams controlling the opening of the exhaust valves.
  • the two shafts are connected to a drive system comprising a phase shifting mechanism intended to cause the variation of the relative angular positions according to the operation of the engine.
  • the cams coupled with the inner shaft are rotatably mounted on the outer shaft which is mounted in fixed bearings in a rotatable and axially stationary manner and present in the circumferential direction of the slots which are crossed radially by fixing bolts which ensure the coupling of the cams mounted in a rotary manner on the external shaft with the internal shaft.
  • the proposed fastening system has certain drawbacks which make the use of the composite camshaft unreliable. Such a system in fact presupposes the drilling of the cams integral with the inner shaft, which is particularly difficult to achieve given the hardness of the materials used.
  • the present invention therefore proposes to remedy these drawbacks by proposing a composite camshaft comprising a system coupling cams rotatably mounted on the outer shaft with the inner shaft both extremely reliable and extremely simple to perform.
  • the composite camshaft for an internal combustion engine of the in-line multi-cylinder type represented in FIGS. 1 to 3 comprises an inner shaft 3 and a hollow outer shaft 1.
  • the outer shaft 1 which is intended to be rotatably mounted in fixed bearings of the motor concentrically houses the inner shaft 2, the latter being able to be angularly displaced relative to the outer shaft.
  • a drive system not shown, having no relation to the invention, ensures the rotation control of the two shafts, this drive system comprising a phase shifting mechanism intended to cause the rotation of the inner and outer shafts one by relative to the other on a given angle of rotation according to the operation of the engine.
  • Each of the shafts is linked to a separate group of cams intended to control the opening of the engine valves.
  • the outer shaft 1 supports the control cams of the exhaust valves not shown. These exhaust cams are secured in rotation with the outer shaft, for example by shrinking.
  • the outer shaft 1 further comprises bearing surfaces also not shown, intended to rotate in fixed bearings of the engine block to ensure the rotational guidance of the composite camshaft.
  • cams 4 and 6 for controlling the intake valves mounted free in rotation on the outer shaft 1, are they secured in rotation with the inner shaft 3.
  • the embodiment of these cams is more particularly described with regard to Figures 2 and 3.
  • the cams 4 and 6 intended to control the intake valves are carried as much as possible in groups of two on sleeves 2.
  • Each sleeve 2 is formed of an oblong part having a cylindrical central bore. It therefore supports two intake cams 4 and 6 arranged at the two axial ends on either side of a central peripheral surface of range 5.
  • This surface of range 5 is intended to be rotatably mounted in a fixed bearing of the engine block .
  • the bearing surfaces of the composite camshaft in the corresponding bearings of the engine therefore consist of bearing surfaces 5 integral with the inner shaft 3 and bearing surfaces directly integral with the shaft exterior 2.
  • the sleeve 2 is adjusted sliding on the outer shaft so as to be perfectly free to rotate and is fixed to the inner shaft 3 by means of a pin 7 consisting of a cylindrical axis which is housed respectively in a bore corresponding cylindrical 8 machined radially through the sleeve 2 and emerging at its two ends in line with the bearing surface 5, and in a corresponding cylindrical bore 10 radially passing through the internal shaft 3.
  • Recesses 9 are provided on the outer shaft 1 to allow the passage of the pin 7, the width of these recesses 9 is dimensioned to allow a certain rotation of the inner shaft 3 relative to the outer shaft 1.
  • the pin 7 passing right through the sleeve 7 and the inner shaft 3 allows a particularly solid connection of the cams 4 and 6 to the shaft 3. It is however possible to provide a fixing system using one or more pins of lesser length coming for example to be lodged in a corresponding blind hole carried by the internal shaft.
  • the positioning of the pin 7 at the level of a bearing ensures a particularly simple and effective locking of the pin, preventing any accidental withdrawal once the camshaft in place, and therefore ensures completely reliable operation unlike the aforementioned prior art in which the fixing bolts can unscrew freely under the effect of vibrations affecting the operation of the composite shaft.
  • the fixing system according to the invention makes it possible to improve the functioning of the composite shaft.
  • the lubricating oil in contact with the bearing surface 5 can penetrate via the various bores 8 and 9 at the level of the internal shaft 3, one can for example provide a longitudinal groove at the periphery of the pin 7.
  • a sleeve can be provided carrying only a cam and a bearing surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

Cam shaft for controlling the opening of the valves of an internal combustion engine, comprising an inner shaft (3) and a hollow outer shaft (1) which is designed to be mounted so that it can rotate in fixed bearings of the engine, the said outer shaft concentrically accommodating the previous one and allowing relative angular position variations, each of the said shafts (1,3) supporting a group of cams (4,6) with which they are integral in terms of rotation, characterised in that at least one of the cams (4,6) integral with the said inner shaft (3) is carried by a sleeve (2) mounted so that it can glide along the outer shaft (1), the said sleeve (2) close to the said cam also having a bearing surface (5) intended to be mounted so that it can rotate in a fixed bearing of the engine. <IMAGE>

Description

L'invention se rapporte à un arbre à cames pour moteur à combustion interne destiné notamment à équiper un véhicule automobile. Elle concerne plus particulièrement un arbre à cames de type composite comportant deux arbres emboîtés qui peuvent être déplacés angulairement l'un par rapport à l'autre, d'une valeur angulaire donnée, chacun de ces arbres supportant des cames dont ils sont solidaires en rotation.The invention relates to a camshaft for an internal combustion engine intended in particular to equip a motor vehicle. It relates more particularly to a composite type camshaft comprising two interlocked shafts which can be angularly displaced with respect to each other, by a given angular value, each of these shafts supporting cams of which they are integral in rotation .

On sait que, pour optimiser les émissions de polluants et diminuer la consommation des moteurs à combustion interne, les différentes phases de fonctionnement d'un moteur à combustion interne nécessite un réglage distinct des lois d'ouverture des soupapes d'admission et d'échappement de façon à ajuster notamment, le recouvrement des périodes d'admission et d'échappement.We know that, to optimize pollutant emissions and reduce the consumption of internal combustion engines, the different operating phases of an internal combustion engine require a separate adjustment of the laws of opening of the intake and exhaust valves. so as to adjust in particular, the overlap of the intake and exhaust periods.

Ainsi un faible recouvrement des périodes d'ouverture des soupapes d'échappement et d'admission est nécessaire dans le domaine des charges partielles et des petites vitesses de rotation du moteur, tandis qu'un recouvrement important est avantageux dans le domaine des hauts régimes.Thus a small overlap of the periods of opening of the exhaust and intake valves is necessary in the field of partial loads and low engine rotation speeds, while a significant overlap is advantageous in the domain of high revs.

Le déphasage des périodes d'ouverture des soupapes peut être réalisé relativement simplement lorsque les soupapes d'échappement et d'admission d'un moteur à combustion interne sont associées à des arbres à cames individuels. Cela s'avère plus difficile dans le cas où l'ouverture de l'ensemble des soupapes d'admission et d'échappement est assuré par un seul arbre à cames.The phase shift of the valve opening periods can be achieved relatively simply when the exhaust and intake valves of an internal combustion engine are associated with individual camshafts. This is more difficult if the opening of the intake and exhaust valves is ensured by a single camshaft.

Le brevet européen EP-A-254.058 divulgue un arbre à cames du type composite, comportant donc deux arbres montés de manière tournante concentriquement l'un à l'autre, dont l'un est solidaire des cames commandant l'ouverture des soupapes d'admission et l'autre, des cames commandant l'ouverture des soupapes d'échappement. Les deux arbres sont reliés à un système d'entraînement comportant un mécanisme déphaseur destiné à provoquer la variation des positions angulaires relatives suivant le fonctionnement du moteur.European patent EP-A-254,058 discloses a camshaft of the composite type, therefore comprising two shafts rotatably mounted concentrically with one another, one of which is integral with the cams controlling the opening of the valves intake and the other, cams controlling the opening of the exhaust valves. The two shafts are connected to a drive system comprising a phase shifting mechanism intended to cause the variation of the relative angular positions according to the operation of the engine.

Les cames couplées avec l'arbre intérieur sont montées de manière tournante sur l'arbre extérieur lequel est monté dans des paliers fixes de manière tournante et axialement immobile et présente dans le sens circonférentiel des fentes qui sont traversées radialement par des boulons de fixation qui assurent l'accouplement des cames montées de manière tournante sur l'arbre extérieur avec l'arbre intérieur.The cams coupled with the inner shaft are rotatably mounted on the outer shaft which is mounted in fixed bearings in a rotatable and axially stationary manner and present in the circumferential direction of the slots which are crossed radially by fixing bolts which ensure the coupling of the cams mounted in a rotary manner on the external shaft with the internal shaft.

Le système de fixation proposé présente certains inconvénients qui rendent peu fiable l'utilisation de l'arbre à cames composite. Un tel système suppose en effet le perçage des cames solidaires de l'arbre intérieur, ce qui est particulièrement difficile à réaliser compte tenu de la dureté des matériaux utilisés.The proposed fastening system has certain drawbacks which make the use of the composite camshaft unreliable. Such a system in fact presupposes the drilling of the cams integral with the inner shaft, which is particularly difficult to achieve given the hardness of the materials used.

De plus les perçages ne peuvent intervenir que dans la zone de repos ou "dos" des cames, il en résulte qu'il n'est possible d'utiliser qu'un seul boulon de fixation par came et encore un boulon de faible dimension notamment axiale. Il y a donc un risque manifeste que ce type de fixation ponctuelle, très sollicité lors du fonctionnement du moteur, vienne à rompre par fatigue en entraînant d'importants dommages pour le moteur.In addition, the holes can only intervene in the rest or "back" zone of the cams, it follows that it is only possible to use a single fixing bolt per cam and again a small bolt in particular axial. There is therefore a clear risk that this type of punctual fastening, which is very stressed during engine operation, could break by fatigue, causing significant damage to the engine.

L'insuffisance un tel système de fixation a également été soulignée dans la demande de brevet français FR-A-2.649.443 où il y est indiqué que manifestement ce type de fixation ponctuelle peut conduire à une déformation de l'élément d'arbre situé intérieurement, dans la région de la fixation par boulon, lorsque la came est exposée à un fort couple de rotation.The insufficiency of such a fixing system was also underlined in the French patent application FR-A-2,649,443 where it is indicated there that obviously this type of punctual fixing can lead to a deformation of the shaft element located internally, in the region of the bolt fixing, when the cam is exposed to a high torque.

La présente invention se propose donc de remédier à ces inconvénients en proposant un arbre à cames composite comportant un système d'accouplement des cames montées de manière tournante sur l'arbre extérieur avec l'arbre intérieur à la fois extrêmement fiable et extrêmement simple à réaliser.The present invention therefore proposes to remedy these drawbacks by proposing a composite camshaft comprising a system coupling cams rotatably mounted on the outer shaft with the inner shaft both extremely reliable and extremely simple to perform.

On comprendra mieux les buts, aspects et avantages de la présente invention, d'après la description présentée ci-après d'un mode de réalisation de l'invention, donné à titre d'exemple non limitatif, en se référant au dessin annexé, dans lequel :

  • la figure 1 est une vue partielle en perspective d'un arbre à cames conforme à l'invention ;
  • la figure 2 est une coupe longitudinale de l'arbre à cames selon la ligne II-II de la figure 1;
  • la figure 3 est une coupe transversale agrandie de l'arbre à cames selon la ligne III-III de la figure 2.
The aims, aspects and advantages of the present invention will be better understood from the description presented below of an embodiment of the invention, given by way of nonlimiting example, with reference to the appended drawing, in which :
  • Figure 1 is a partial perspective view of a camshaft according to the invention;
  • Figure 2 is a longitudinal section of the camshaft according to line II-II of Figure 1;
  • FIG. 3 is an enlarged cross-section of the camshaft along the line III-III of FIG. 2.

Conformément aux figures, seuls les éléments nécessaires à la compréhension de l'invention ont été représentés. Pour faciliter la compréhension des dessins les mêmes éléments reçoivent les mêmes signes de référence dans les différentes figures.In accordance with the figures, only the elements necessary for understanding the invention have been shown. To facilitate understanding of the drawings, the same elements are given the same reference signs in the different figures.

L'arbre à cames composite pour moteur à combustion interne du type multicylindre en ligne que représentent les figures 1 à 3, comprend un arbre intérieur 3 et un arbre extérieur creux 1. L'arbre extérieur 1 qui est destiné à être monté de manière tournante dans des paliers fixes du moteur loge concentriquement l'arbre intérieur 2, ce dernier pouvant être déplacé angulairement par rapport à l'arbre extérieur.The composite camshaft for an internal combustion engine of the in-line multi-cylinder type represented in FIGS. 1 to 3 comprises an inner shaft 3 and a hollow outer shaft 1. The outer shaft 1 which is intended to be rotatably mounted in fixed bearings of the motor concentrically houses the inner shaft 2, the latter being able to be angularly displaced relative to the outer shaft.

Un système d'entraînement non figuré, n'ayant aucune relation avec l'invention, assure la commande en rotation des deux arbres, ce système d'entraînement comportant un mécanisme déphaseur destiné à provoquer la rotation des arbres intérieur et extérieur l'un par rapport à l'autre sur un angle de rotation donné suivant le fonctionnement du moteur.A drive system not shown, having no relation to the invention, ensures the rotation control of the two shafts, this drive system comprising a phase shifting mechanism intended to cause the rotation of the inner and outer shafts one by relative to the other on a given angle of rotation according to the operation of the engine.

Chacun des arbres est lié à un groupe de cames distinct destinées à commander l'ouverture des soupapes du moteur. L'arbre extérieur 1 supporte les cames de commande des soupapes d'échappement non figurées. Ces cames d'échappement sont solidarisées en rotation avec l'arbre extérieur par exemple par frettage. L'arbre extérieur 1 comporte de plus des surfaces de portées également non figurées, destinées à tourner dans des paliers fixes du bloc moteur pour assurer le guidage en rotation de l'arbre à cames composite.Each of the shafts is linked to a separate group of cams intended to control the opening of the engine valves. The outer shaft 1 supports the control cams of the exhaust valves not shown. These exhaust cams are secured in rotation with the outer shaft, for example by shrinking. The outer shaft 1 further comprises bearing surfaces also not shown, intended to rotate in fixed bearings of the engine block to ensure the rotational guidance of the composite camshaft.

Les cames 4 et 6 de commande des soupapes d'admission, montées libres en rotation sur l'arbre extérieur 1, sont elles solidarisées en rotation avec l'arbre intérieur 3. Le mode d'exécution de ces cames est plus particulièrement décrit en regard des figures 2 et 3.The cams 4 and 6 for controlling the intake valves, mounted free in rotation on the outer shaft 1, are they secured in rotation with the inner shaft 3. The embodiment of these cams is more particularly described with regard to Figures 2 and 3.

Les cames 4 et 6 destinées à commander les soupapes d'admission sont portées dans la mesure du possible par groupe de deux sur des manchons 2.The cams 4 and 6 intended to control the intake valves are carried as much as possible in groups of two on sleeves 2.

Chaque manchon 2 est formé d'une pièce oblongue présentant un alésage central cylindrique. Il supporte donc deux cames d'admission 4 et 6 disposées aux deux extrémités axiales de part et d'autre d'une surface périphérique centrale de portée 5. Cette surface de portée 5 est destinée à être montée tournante dans un palier fixe du bloc moteur.Each sleeve 2 is formed of an oblong part having a cylindrical central bore. It therefore supports two intake cams 4 and 6 arranged at the two axial ends on either side of a central peripheral surface of range 5. This surface of range 5 is intended to be rotatably mounted in a fixed bearing of the engine block .

Conformément à l'invention, les surfaces de portées de l'arbre à cames composite dans les paliers correspondants du moteur, se composent donc de surfaces de portées 5 solidaires de l'arbre intérieur 3 et de surfaces de portée directement solidaires de l'arbre extérieur 2.According to the invention, the bearing surfaces of the composite camshaft in the corresponding bearings of the engine, therefore consist of bearing surfaces 5 integral with the inner shaft 3 and bearing surfaces directly integral with the shaft exterior 2.

Le manchon 2 est ajusté glissant sur l'arbre extérieur de façon à être parfaitement libre en rotation et est fixé à l'arbre intérieur 3 par l'intermédiaire d'une goupille 7 constituée d'un axe cylindrique venant se loger respectivement dans un alésage cylindrique correspondant 8 usiné radialement à travers le manchon 2 et débouchant par ses deux extrémités au droit de la surface de portée 5, et dans un alésage cylindrique correspondant 10 traversant radialement l'arbre intérieur 3.The sleeve 2 is adjusted sliding on the outer shaft so as to be perfectly free to rotate and is fixed to the inner shaft 3 by means of a pin 7 consisting of a cylindrical axis which is housed respectively in a bore corresponding cylindrical 8 machined radially through the sleeve 2 and emerging at its two ends in line with the bearing surface 5, and in a corresponding cylindrical bore 10 radially passing through the internal shaft 3.

Des évidements 9 sont prévus sur l'arbre extérieur 1 pour permettre le passage de la goupille 7, la largeur de ces évidements 9 est dimensionnée pour permettre une certaine rotation de l'arbre intérieur 3 par rapport à l'arbre extérieur 1.Recesses 9 are provided on the outer shaft 1 to allow the passage of the pin 7, the width of these recesses 9 is dimensioned to allow a certain rotation of the inner shaft 3 relative to the outer shaft 1.

Ainsi grâce à l'invention, il est possible en utilisant une seule goupille de solidariser en rotation deux cames d'admission à l'arbre intérieur et ce, sans venir altérer la surface de ces dernières.Thus thanks to the invention, it is possible by using a single pin to secure in rotation two intake cams to the inner shaft and without altering the surface of the latter.

La goupille 7 traversant de part en part le manchon 7 et l'arbre intérieur 3 permet une solidarisation particulièrement solide des cames 4 et 6 à l'arbre 3. Il est toutefois possible de prévoir un système de fixation utilisant une ou plusieurs goupilles de moindre longueur venant par exemple se loger dans un trou borgne correspondant porté par l'arbre intérieur.The pin 7 passing right through the sleeve 7 and the inner shaft 3 allows a particularly solid connection of the cams 4 and 6 to the shaft 3. It is however possible to provide a fixing system using one or more pins of lesser length coming for example to be lodged in a corresponding blind hole carried by the internal shaft.

La meilleure répartition des efforts transmis du fait du positionnement décalé des cames autour de la pièce 2, contribue également à réduire les contraintes de cisaillement auxquelles est soumise la goupille 7 et à diminuer les déformations de l'arbre intérieur 3.The better distribution of the forces transmitted due to the offset positioning of the cams around the part 2, also contributes to reducing the shear stresses to which the pin 7 is subjected and to reducing the deformations of the inner shaft 3.

De plus, le positionnement de la goupille 7 au droit d'un palier, assure un verrouillage particulièrement simple et efficace de la goupille, empêchant tout retrait accidentel une fois l'arbre à cames en place, et assure donc un fonctionnement totalement fiable contrairement à l'art antérieur précité dans lequel les boulons de fixation peuvent se dévisser librement sous l'effet des vibrations affectant le fonctionnement de l'arbre composite.In addition, the positioning of the pin 7 at the level of a bearing, ensures a particularly simple and effective locking of the pin, preventing any accidental withdrawal once the camshaft in place, and therefore ensures completely reliable operation unlike the aforementioned prior art in which the fixing bolts can unscrew freely under the effect of vibrations affecting the operation of the composite shaft.

Le système de fixation selon l'invention permet d'améliorer le fonctionnement de l'arbre composite. En effet l'huile de lubrification au contact de la surface de portée 5 peut pénétrer via les différents perçages 8 et 9 au niveau de l'arbre intérieur 3, on peut par exemple prévoir une rainure longitudinale à la périphérie de la goupille 7.The fixing system according to the invention makes it possible to improve the functioning of the composite shaft. In fact, the lubricating oil in contact with the bearing surface 5 can penetrate via the various bores 8 and 9 at the level of the internal shaft 3, one can for example provide a longitudinal groove at the periphery of the pin 7.

Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple.Of course, the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example.

Au contraire, l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont effectuées suivant son esprit.On the contrary, the invention includes all the technical equivalents of the means described and their combinations if these are carried out according to the spirit.

Ainsi dans le cas de moteur comportant un nombre impair de cylindres, on peut prévoir un manchon portant seulement une came et une surface de portée.Thus in the case of an engine having an odd number of cylinders, a sleeve can be provided carrying only a cam and a bearing surface.

Claims (4)

[1] Arbre à cames pour commander l'ouverture des soupapes d'un moteur à combustion interne, comprenant un arbre intérieur (3) et un arbre extérieur creux (1) destiné à être monté de manière tournante dans des paliers fixes du moteur de manière tournante, ledit arbre extérieur logeant concentriquement le précédent et autorisant des variations de positions angulaires relatives, chacun desdits arbres (1,3) supportant un groupe de cames (4,6) dont ils sont solidaires en rotation, caractérisé en ce qu'au moins une des cames (4,6) solidaires dudit arbre intérieur (3) est portée par un manchon (2) monté glissant sur l'arbre extérieur (1), ledit manchon (2) portant également au voisinage de ladite came, une surface de portée (5) destinée à être montée de manière tournante dans un palier fixe du moteur. [1] Camshaft for controlling the opening of the valves of an internal combustion engine, comprising an inner shaft (3) and a hollow outer shaft (1) intended to be rotatably mounted in fixed bearings of the engine in a rotary manner, said outer shaft concentrically housing the previous one and allowing variations in relative angular positions, each of said shafts (1,3) supporting a group of cams (4,6) of which they are integral in rotation, characterized in that at at least one of the cams (4,6) integral with said inner shaft (3) is carried by a sleeve (2) mounted to slide on the outer shaft (1), said sleeve (2) also carrying, in the vicinity of said cam, a surface bearing (5) intended to be rotatably mounted in a fixed bearing of the motor. [2] Arbre à cames selon la revendication 1, caractérisé en ce que deux cames (4,6) sont portées par un même manchon (2), les deux cames s'étendant aux deux extrémités longitudinales du manchon (2) de part et d'autre de la surface de portée (5). [2] Camshaft according to claim 1, characterized in that two cams (4,6) are carried by the same sleeve (2), the two cams extending at the two longitudinal ends of the sleeve (2) from the side and on the other side of the bearing surface (5). [3] Arbre à cames selon l'une quelconque des revendications 1 à 2, caractérisé en ce que ledit manchon (2) est solidarisé à l'arbre intérieur (3) au moyen d'une goupille (7), ladite goupille venant se loger respectivement dans un alésage correspondant (8) dudit manchon (2) débouchant au droit de la surface de portée (5) et dans un alésage correspondant (10) de l'arbre intérieur (3). [3] Camshaft according to any one of claims 1 to 2, characterized in that said sleeve (2) is secured to the inner shaft (3) by means of a pin (7), said pin coming to be housed respectively in a corresponding bore (8) of said sleeve (2) opening out in line with the bearing surface (5) and in a corresponding bore (10) of the inner shaft (3). [4] Arbre à cames selon l'une quelconque des revendications 1 à 2, caractérisé en ce que l'arbre intérieur est solidaire des cames commandant l'ouverture des soupapes d'admission dudit moteur. [4] Camshaft according to any one of claims 1 to 2, characterized in that the inner shaft is integral with the cams controlling the opening of the intake valves of said engine.
EP94401975A 1993-09-09 1994-09-06 Internal combustion engine camshaft Withdrawn EP0643200A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9310707 1993-09-09
FR9310707A FR2709786B1 (en) 1993-09-09 1993-09-09 Camshaft for internal combustion engine.

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EP0643200A1 true EP0643200A1 (en) 1995-03-15

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EP94401975A Withdrawn EP0643200A1 (en) 1993-09-09 1994-09-06 Internal combustion engine camshaft

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EP (1) EP0643200A1 (en)
FR (1) FR2709786B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686754A2 (en) * 1994-05-12 1995-12-13 Carraro S.P.A. A single shaft timing system, particularly for internal combustion engines
EP1362986A1 (en) * 2001-05-15 2003-11-19 Mechadyne plc Variable camshaft assembly
DE102005004976A1 (en) * 2005-02-04 2006-08-10 Mahle International Gmbh Camshaft with mutually rotatable cam for motor vehicle engines in particular
DE102005014680A1 (en) * 2005-02-03 2006-08-10 Mahle International Gmbh Camshaft with mutually rotatable cam for motor vehicles in particular
EP1696106A1 (en) * 2005-01-19 2006-08-30 Mahle International GmbH Shaft device, in particular camshaft of vehicle engine
EP1754913A2 (en) 2005-08-16 2007-02-21 Mahle International GmbH Attached, precast single cam comprising multiple cams.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19757504B4 (en) * 1997-12-23 2005-03-31 Daimlerchrysler Ag Built camshaft for an internal combustion engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2747884A1 (en) * 1977-10-26 1979-05-03 Audi Nsu Auto Union Ag IC engine cam timing modification system - uses pulleys on sliding arms to vary effective length of drive belt
JPS6017214A (en) * 1983-07-11 1985-01-29 Toyota Motor Corp Valve gear for internal-combustion engine
WO1991005941A1 (en) * 1989-10-13 1991-05-02 Rover Group Limited An internal combustion engine camshaft drive mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2747884A1 (en) * 1977-10-26 1979-05-03 Audi Nsu Auto Union Ag IC engine cam timing modification system - uses pulleys on sliding arms to vary effective length of drive belt
JPS6017214A (en) * 1983-07-11 1985-01-29 Toyota Motor Corp Valve gear for internal-combustion engine
WO1991005941A1 (en) * 1989-10-13 1991-05-02 Rover Group Limited An internal combustion engine camshaft drive mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 135 (M - 386) 11 June 1985 (1985-06-11) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686754A2 (en) * 1994-05-12 1995-12-13 Carraro S.P.A. A single shaft timing system, particularly for internal combustion engines
EP0686754A3 (en) * 1994-05-12 1996-04-10 Carraro Spa A single shaft timing system, particularly for internal combustion engines
EP1362986A1 (en) * 2001-05-15 2003-11-19 Mechadyne plc Variable camshaft assembly
EP1696106A1 (en) * 2005-01-19 2006-08-30 Mahle International GmbH Shaft device, in particular camshaft of vehicle engine
US7284521B2 (en) 2005-01-19 2007-10-23 Mahle International Gmbh Shaft mechanism, in particular camshaft of automotive engines
DE102005014680A1 (en) * 2005-02-03 2006-08-10 Mahle International Gmbh Camshaft with mutually rotatable cam for motor vehicles in particular
US7610890B2 (en) 2005-02-03 2009-11-03 Mahle International Gmbh Camshaft with cams that can be rotated in relation to each other, especially for motor vehicles
DE102005004976A1 (en) * 2005-02-04 2006-08-10 Mahle International Gmbh Camshaft with mutually rotatable cam for motor vehicle engines in particular
US7431002B2 (en) 2005-02-04 2008-10-07 Mahle International Gmbh Camshaft with contrarotating cams for automotive engines in particular
EP1754913A2 (en) 2005-08-16 2007-02-21 Mahle International GmbH Attached, precast single cam comprising multiple cams.
EP1754913A3 (en) * 2005-08-16 2008-07-16 Mahle International GmbH Attached, precast single cam comprising multiple cams.
US9709152B2 (en) 2005-08-16 2017-07-18 Mahle International Gmbh Joined multiple cam comprising individual prefabricated cams

Also Published As

Publication number Publication date
FR2709786B1 (en) 1995-11-17
FR2709786A1 (en) 1995-03-17

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