EP0532377A1 - Positionning device for the camshaft of an internal combustion engine and camshaft using this device - Google Patents

Positionning device for the camshaft of an internal combustion engine and camshaft using this device Download PDF

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Publication number
EP0532377A1
EP0532377A1 EP92402273A EP92402273A EP0532377A1 EP 0532377 A1 EP0532377 A1 EP 0532377A1 EP 92402273 A EP92402273 A EP 92402273A EP 92402273 A EP92402273 A EP 92402273A EP 0532377 A1 EP0532377 A1 EP 0532377A1
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EP
European Patent Office
Prior art keywords
camshaft
carried
angular positioning
cylinder head
reference surface
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Withdrawn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
EP92402273A
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German (de)
French (fr)
Inventor
Guy Dardelet
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 EP0532377A1 publication Critical patent/EP0532377A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • 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
    • 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
    • F01L1/024—Belt drive
    • 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
    • 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
    • F01L1/053—Camshafts overhead type
    • F01L2001/0535—Single overhead camshafts [SOHC]
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a device for positioning a camshaft of an internal combustion engine fitted in particular to motor vehicles as well as a camshaft arranged according to this device.
  • It relates more particularly to a device allowing the angular setting of a camshaft equipping an engine of the type with overhead camshafts, for the installation of the elements of the distribution control: drive pinion and toothed transmission belt (or chain).
  • the angular positioning of the camshaft is operated by initially positioning the crankshaft so that the piston of cylinder 1 is in top dead center.
  • the distribution control is then set up by means of predetermined marks carried by the toothed belt and the drive pinions of the crankshaft and the camshaft.
  • the angular indexing between the camshaft and crankshaft pinions and respectively the camshaft and the crankshaft also being obtained in a predetermined manner by keying.
  • the invention relates to a device for very precisely positioning the camshaft prior to the installation of the elements of the timing control, the latter therefore no longer participating in the setting of the camshaft.
  • the device relates more particularly to engines of the overhead camshaft type where the camshaft is rotatably mounted in bearings carried by the cylinder head.
  • the device for angular positioning of a camshaft is characterized in that it comprises at least one mark carried by the camshaft, at least one mark carried by the cylinder head or the cylinder head cover and wedging means able to cooperate with each of said pins so as to immobilize the camshaft in a predetermined angular position.
  • said reference mark carried by the cylinder head is formed by a flat reference surface, extending parallel to the axis of rotation of the camshaft.
  • said reference surface carried by the cylinder head is formed by the upper tab.
  • said wedging means comprise at least a first bearing face having a flat surface, said face being intended to come to rest on said reference surface carried by the cylinder head.
  • said reference mark carried by the camshaft is formed by at least one reference surface.
  • said wedging means comprise a second bearing face having a surface complementary to said reference surface of the camshaft, said second face being intended to come into contact of said reference surface carried by the camshaft and on the other hand, said second bearing face not being parallel to said first bearing face.
  • said reference mark carried by the camshaft is defined by two parallel plates machined at the periphery of the camshaft, said plates extending parallel to the axis longitudinal of the camshaft.
  • said wedging means are constituted by a monobloc tool comprising two parallel faces intended to grip the two dishes and a bearing surface intended to rest on the reference surface of the breech.
  • Said tool is more precisely constituted by a U-shaped stirrup, said stirrup being formed by a body comprising in two arms protruding, said arms having parallel and straight opposite side faces intended to come into contact with the plates carried by the camshaft and coplanar transverse ends intended to lie flat on the reference surface of the cylinder head.
  • said reference mark carried by the camshaft is formed by a cylindrical bore extending perpendicular to the longitudinal axis of the camshaft.
  • said wedging means are formed by a one-piece M-shaped tool, comprising a body projecting from a cylindrical rod intended to be introduced into the bore carried by the camshaft and two arms extending on either side of said rod, said arms having coplanar transverse ends intended to lie flat on the reference surface of the cylinder head.
  • the camshaft has a second mark enabling the orientation of the reference surface carried by the camshaft to be specified.
  • said first and second bearing faces of said wedging means extend perpendicular to each other.
  • Figures 1 and 2 therefore schematically represent the upper face of a cylinder head (1) of an internal combustion engine, only the constituent parts of the engine necessary for understanding the invention have been shown.
  • the internal combustion engine petrol or diesel
  • the camshaft (2) is therefore mounted on the cylinder head, in a manner known per se, rotatable in bearings carried by the latter.
  • the distribution control no longer participates in the timing of the camshaft.
  • the timing is directly effected from predetermined marks carried respectively by the frame of the engine block and the camshaft, timing means capable of cooperating with the marks to immobilize the camshaft in a predetermined angular position.
  • the camshaft (2) In the vicinity of one of its longitudinal ends and in line with the upper tab (6) of the cylinder head, the camshaft (2) therefore has a positioning reference mark consisting of two parallel plates (5) machined to the periphery of the tree. These two plates (5), which extend parallel to the axis of the camshaft, are intended to be positioned in a predetermined manner relative to the flat surface extending parallel to the axis of rotation -from l 'camshaft which is defined by the upper tablature (6) of the cylinder head and which thus constitutes another positioning reference.
  • the two plates are positioned at the periphery of the camshaft so that the timing of the camshaft is achieved when these two plates (5) are perpendicular to the plane of the tablature (6), see FIG. 2.
  • stirrup in inverted U shape.
  • This stirrup comprises a body (3) comprising two projecting arms (8), these arms (8) have planar and parallel internal lateral faces (4) capable of coming to bear on the two flats (5) of the shaft to cams, while the transverse ends (7) are coplanar and extend perpendicular to said parallel faces (4).
  • the positioning of the dishes (5) at right angles to the plane of the tablature (6) generates two angular positions of the camshaft, 180 ° from one another.
  • the angular position of the camshaft (2) is then very precisely adjusted. It is shown that with normal production details of the dishes (5), of the different reference faces of the stirrup (4,7) and of the tablature (6) of the cylinder head (2), the shaft is positioned at cams with a dispersion of only 30 minutes of angle.
  • the camshaft (2) being positioned, it then suffices to fix the drive pinion at the end of the shaft by simple screwing to the torque and to put in place the other elements of the distribution control.
  • the timing of the camshaft is operated by positioning the bore (51) perpendicular to the plane of the tablature (6), the positioning ambiguity being removed in accordance with the device described above.
  • a one-piece adapted tool in the form of an M is used for setting it.
  • the tool has a body (31) provided with a cylindrical central rod (41) capable of being received in the bore (51) of the shaft to cams (21), this rod (41) being surrounded by two substantially parallel arms (81) having coplanar support ends (71) extend perpendicular to said rod (41).
  • the device which has just been described in accordance with FIGS. 1 to 4, is extremely simple to implement since it requires, in all and for all, only the production of the two plates or the drilling, at the end of the camshaft, while keying requires the production of two holes and the installation of an insert, which for mass production represents a significant gain.
  • the device allows very precise timing of the camshaft since it allows dispersions to be limited to 30 minutes of angles.
  • the device also has the advantage of being perfectly insensitive to variations in the positioning of the camshaft relative to the cylinder head (unlike the setting method according to the prior art via the distribution control where any variation in distance between the crankshaft and the camshaft generates a phase shift).
  • the purpose of the tool is to set the reference surfaces of the camshaft and the cylinder head to Right angle, it is possible to move the contact points between the tool and these reference surfaces without calling into question the angularity.
  • the invention includes all the technical equivalents of the means described and their combinations if these are carried out according to the spirit.
  • the upper tab of the cylinder head can be replaced as a reference surface by the cylinder head cover.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

Device for angularly positioning an internal combustion engine camshaft for installing the elements for controlling the timing, the said camshaft (2, 21) being mounted rotationally in bearings carried by the cylinder head (1), characterised in that it comprises at least one reference (5, 51) carried by the camshaft (2, 21), at least one reference (6) carried by the cylinder head (1) or the cylinder head cover and wedging means (3, 31) able to interact with each of the said references so as to immobilise the camshaft (2, 21) in a predetermined angular position. <IMAGE>

Description

La présente invention a pour objet un dispositif de positionnement d'un arbre à cames de moteur à combustion interne équipant notamment les véhicules automobiles ainsi qu'un arbre à cames agencé suivant ce dispositif.The present invention relates to a device for positioning a camshaft of an internal combustion engine fitted in particular to motor vehicles as well as a camshaft arranged according to this device.

Elle vise plus particulièrement un dispositif permettant le calage angulaire d'un arbre à cames équipant un moteur du type à arbres à cames en tête, pour la mise en place des éléments de la commande de distribution : pignon d'entraînement et courroie crantée de transmission (ou chaîne).It relates more particularly to a device allowing the angular setting of a camshaft equipping an engine of the type with overhead camshafts, for the installation of the elements of the distribution control: drive pinion and toothed transmission belt (or chain).

Le positionnement angulaire ou calage d'un arbre à cames demande beaucoup de précision lors du montage de ce dernier dans le moteur, car l'arbre à cames doit être parfaitement phasé avec le vilebrequin. Toute variation entre les positions relatives des deux organes introduit des avances ou des retards non désirés dans la levée des soupapes. Ces modifications ainsi apportées à la loi de levée des soupapes sont préjudiciables au fonctionnement du moteur notamment en terme d'émission de polluants.The angular positioning or timing of a camshaft requires a lot of precision when mounting it in the engine, because the camshaft must be perfectly phased with the crankshaft. Any variation between the relative positions of the two members introduces unwanted advances or delays in the lifting of the valves. These changes thus made to the lifting law valves are detrimental to the operation of the engine, particularly in terms of emission of pollutants.

Dans les montages classiques le positionnement angulaire de l'arbre à cames est opéré en positionnant initialement le vilebrequin de façon que le piston du cylindre 1 soit au point mort haut. La commande de distribution est alors mise en place grâce à des repères prédéterminés portés par la courroie crantée et les pignons d'entraînement du vilebrequin et de l'arbre à cames. L'indexation angulaire entre les pignons d'arbre à cames et de vilebrequin et respectivement l'arbre à cames et le vilebrequin étant également obtenue de manière prédéterminée par clavetage.In conventional assemblies, the angular positioning of the camshaft is operated by initially positioning the crankshaft so that the piston of cylinder 1 is in top dead center. The distribution control is then set up by means of predetermined marks carried by the toothed belt and the drive pinions of the crankshaft and the camshaft. The angular indexing between the camshaft and crankshaft pinions and respectively the camshaft and the crankshaft also being obtained in a predetermined manner by keying.

Un tel calage s'avère peu précis, du fait notamment des dispersions de fabrication et de montage des différents éléments de la commande de distribution. Il en résulte une incertitude de l'ordre de plusieurs degrés d'angle entre le positionnement angulaire théorique et le positionnement réel de l'arbre à cames. Une telle dispersion apparaît de moins en moins supportable compte tenu de la sévérisation des normes antipollution.Such a setting proves to be imprecise, in particular due to the manufacturing and mounting dispersions of the various elements of the distribution control. This results in an uncertainty of the order of several degrees of angle between the theoretical angular positioning and the actual positioning of the camshaft. Such a dispersion appears less and less bearable given the severity of anti-pollution standards.

Le but de l'invention est donc de pallier aux inconvénients précités en proposant un dispositif de positionnement de l'arbre à cames qui est à la fois particulièrement précis et simple à mettre en oeuvre.The object of the invention is therefore to alleviate the aforementioned drawbacks by proposing a device for positioning the camshaft which is both particularly precise and simple to implement.

L'invention a pour objet un dispositif permettant de positionner très précisément l'arbre à cames préalablement à la mise en place des éléments de la commande de distribution, ces derniers ne participant donc plus au calage de l'arbre à cames. Le dispositif concerne plus particulièrement les moteurs du type à arbre à cames en tête où l'arbre à cames est monté rotatif dans des paliers portés par la culasse.The invention relates to a device for very precisely positioning the camshaft prior to the installation of the elements of the timing control, the latter therefore no longer participating in the setting of the camshaft. The device relates more particularly to engines of the overhead camshaft type where the camshaft is rotatably mounted in bearings carried by the cylinder head.

Selon l'invention, le dispositif de positionnement angulaire d'un arbre à cames est caractérisé en ce qu'il comporte au moins un repère porté par l'arbre à cames, au moins un repère porté par la culasse ou le couvre-culasse et des moyens de calage aptes à coopérer avec chacun desdits repères de façon à immobiliser l'arbre à cames dans une position angulaire prédéterminée.According to the invention, the device for angular positioning of a camshaft is characterized in that it comprises at least one mark carried by the camshaft, at least one mark carried by the cylinder head or the cylinder head cover and wedging means able to cooperate with each of said pins so as to immobilize the camshaft in a predetermined angular position.

Selon un mode de réalisation du dispositif de positionnement selon l'invention, ledit repère porté par la culasse est formé par une surface de référence plane, s'étendant parallèlement à l'axe de rotation de l'arbre à cames.According to one embodiment of the positioning device according to the invention, said reference mark carried by the cylinder head is formed by a flat reference surface, extending parallel to the axis of rotation of the camshaft.

Selon un mode de réalisation préféré du dispositif de positionnement selon l'invention, ladite surface de référence portée par la culasse est formée par la tablature supérieure.According to a preferred embodiment of the positioning device according to the invention, said reference surface carried by the cylinder head is formed by the upper tab.

Suivant une autre caractéristique du dispositif de positionnement selon l'invention, lesdits moyens de calage comportent au moins une première face d'appui présentant une surface plane, ladite face étant destinée à venir reposer sur ladite surface de référence portée par la culasse.According to another characteristic of the positioning device according to the invention, said wedging means comprise at least a first bearing face having a flat surface, said face being intended to come to rest on said reference surface carried by the cylinder head.

Suivant une autre caractéristique du dispositif de positionnement selon l'invention, ledit repère porté par l'arbre à cames est formé par au moins une surface de référence.According to another characteristic of the positioning device according to the invention, said reference mark carried by the camshaft is formed by at least one reference surface.

Suivant une autre caractéristique 'du dispositif de positionnement selon l'invention, lesdits moyens de calage comportent une seconde face d'appui présentant une surface complémentaire à ladite surface de référence de l'arbre à cames, ladite seconde face étant destinée à venir au contact de ladite surface de référence portée par l'arbre à cames et d'autre part, ladite seconde face d'appui n'étant pas parallèle à ladite première face d'appui.According to another characteristic 'of the positioning device according to the invention, said wedging means comprise a second bearing face having a surface complementary to said reference surface of the camshaft, said second face being intended to come into contact of said reference surface carried by the camshaft and on the other hand, said second bearing face not being parallel to said first bearing face.

Selon un mode de réalisation du dispositif de positionnement selon l'invention, ledit repère porté par l'arbre à cames est défini par deux plats parallèles usinés à la périphérie de l'arbre à cames, lesdits plats s'étendant parallèlement à l'axe longitudinal de l'arbre à came.According to one embodiment of the positioning device according to the invention, said reference mark carried by the camshaft is defined by two parallel plates machined at the periphery of the camshaft, said plates extending parallel to the axis longitudinal of the camshaft.

Selon ce même mode de réalisation du dispositif de positionnement selon l'invention, lesdits moyens de calage sont constitués par un outil monobloc comportant deux faces parallèles destinées à venir enserrer les deux plats et une surface d'appui destinée à reposer sur la surface de référence de la culasse. Ledit outil est plus précisément constitué par un étrier en forme de U, ledit étrier étant formé par un corps comportant en saillie deux bras, lesdits bras présentant des faces latérales en regard parallèles et droites destinées à venir au contact des plats portés par l'arbre à cames et des extrémités transversales coplanaires destinées à reposer à plat sur la surface de référence de la culasse.According to this same embodiment of the positioning device according to the invention, said wedging means are constituted by a monobloc tool comprising two parallel faces intended to grip the two dishes and a bearing surface intended to rest on the reference surface of the breech. Said tool is more precisely constituted by a U-shaped stirrup, said stirrup being formed by a body comprising in two arms protruding, said arms having parallel and straight opposite side faces intended to come into contact with the plates carried by the camshaft and coplanar transverse ends intended to lie flat on the reference surface of the cylinder head.

Selon un autre mode de réalisation du dispositif de positionnement selon l'invention, ledit repère porté par l'arbre à cames est formé par un perçage cylindrique s'étendant perpendiculairement à l'axe longitudinal de l'arbre à came.According to another embodiment of the positioning device according to the invention, said reference mark carried by the camshaft is formed by a cylindrical bore extending perpendicular to the longitudinal axis of the camshaft.

Selon cet autre mode de réalisation du dispositif de positionnement selon l'invention, lesdits moyens de calage sont formés par un outil monobloc en forme de M, comportant un corps muni en saillie d'une tige cylindrique destinées à être introduite dans le perçage porté par l'arbre à cames et de deux bras s'étendant de part et d'autre de la dite tige, lesdits bras présentant des extrémités transversales coplanaires destinées à reposer à plat sur la surface de référence de la culasse.According to this other embodiment of the positioning device according to the invention, said wedging means are formed by a one-piece M-shaped tool, comprising a body projecting from a cylindrical rod intended to be introduced into the bore carried by the camshaft and two arms extending on either side of said rod, said arms having coplanar transverse ends intended to lie flat on the reference surface of the cylinder head.

Selon une autre caractéristique du dispositif de positionnement selon l'invention, l'arbre à cames présente un second repère permettant de préciser l'orientation de la surface de référence portée par l'arbre à cames.According to another characteristic of the positioning device according to the invention, the camshaft has a second mark enabling the orientation of the reference surface carried by the camshaft to be specified.

Selon une autre caractéristique du dispositif de positionnement selon l'invention, lesdites première et seconde faces d'appui desdits moyens de calage s'étendent perpendiculairement l'une à l'autre.According to another characteristic of the positioning device according to the invention, said first and second bearing faces of said wedging means extend perpendicular to each other.

L'invention concerne également un arbre à cames de moteur à combustion interne agencé pour un dispositif de positionnement angulaire selon l'une quelconque des caractéristiques précédentes.The invention also relates to an internal combustion engine camshaft arranged for an angular positioning device according to any one of the preceding characteristics.

On comprendra mieux les buts, aspects et avantages de la présente invention, d'après la description donnée ci-après de deux modes- de réalisation de l'invention, donnés à titre d'exemples non limitatifs, en se référant au dessin annexé, dans lequel :

  • la figure 1 est une vue en perspective décrivant la mise en oeuvre du dispositif de positionnement d'un arbre à cames selon la présente invention ;
  • la figure 2 est une vue similaire à la figure 1 précisant la mise en oeuvre du dispositif ;
  • la figure 3 est une vue similaire à la figure 1, décrivant une variante du dispositif de positionnement.
The aims, aspects and advantages of the present invention will be better understood from the description given below of two embodiments of the invention, given by way of nonlimiting examples, with reference to the appended drawing, in which :
  • Figure 1 is a perspective view describing the implementation of the camshaft positioning device according to the present invention;
  • Figure 2 is a view similar to Figure 1 detailing the implementation of the device;
  • Figure 3 is a view similar to Figure 1, describing a variant of the positioning device.

Les figures 1 et 2 représentent donc schématiquement la face supérieure d'une culasse (1) de moteur à combustion interne, seules les parties constitutives du moteur nécessaires à la compréhension de l'invention ont été figurées. Le moteur à combustion interne, essence ou diesel, est du type à arbre à cames en tête. L'arbre à cames (2) est donc monté sur la culasse, d'une manière connue en soi, rotatif dans des paliers portés par cette dernière.Figures 1 and 2 therefore schematically represent the upper face of a cylinder head (1) of an internal combustion engine, only the constituent parts of the engine necessary for understanding the invention have been shown. The internal combustion engine, petrol or diesel, is of the overhead camshaft type. The camshaft (2) is therefore mounted on the cylinder head, in a manner known per se, rotatable in bearings carried by the latter.

Conformément à l'invention, la commande de distribution ne participe plus au calage de l'arbre à cames. Le calage est directement opéré à partir de repères prédéterminés portés respectivement par le bâti du bloc moteur et l'arbre à cames, des moyens de calage aptes à coopérer avec les repérés pour immobiliser l'arbre à cames dans une position angulaire prédéterminée.According to the invention, the distribution control no longer participates in the timing of the camshaft. The timing is directly effected from predetermined marks carried respectively by the frame of the engine block and the camshaft, timing means capable of cooperating with the marks to immobilize the camshaft in a predetermined angular position.

Au voisinage de l'une de ses extrémités longitudinales et au droit de la tablature supérieure (6) de la culasse, l'arbre à cames (2) présente donc-un-repère de positionnement constitué par deux plats parallèles (5) usinés à la périphérie de l'arbre. Ces deux plats (5), qui s'étendent parallèlement à l'axe de l'arbre à cames, sont destinés à être positionnés de manière prédéterminée par rapport à la surface plane s'étendant parallèlement à l'axe de rotation -de l'arbre à cames qui est définie par la tablature supérieure (6) de la culasse et qui constitue ainsi un autre repère de positionnement.In the vicinity of one of its longitudinal ends and in line with the upper tab (6) of the cylinder head, the camshaft (2) therefore has a positioning reference mark consisting of two parallel plates (5) machined to the periphery of the tree. These two plates (5), which extend parallel to the axis of the camshaft, are intended to be positioned in a predetermined manner relative to the flat surface extending parallel to the axis of rotation -from l 'camshaft which is defined by the upper tablature (6) of the cylinder head and which thus constitutes another positioning reference.

Les deux plats sont positionnés à la périphérie de l'arbre à cames de façon que le calage de l'arbre à cames soit réalisé lorsque ces deux plats (5) sont perpendiculaires au plan de la tablature (6), confere figure 2.The two plates are positioned at the periphery of the camshaft so that the timing of the camshaft is achieved when these two plates (5) are perpendicular to the plane of the tablature (6), see FIG. 2.

Pour réaliser ce positionnement on utilise un outil monobloc adapté à savoir un étrier en forme de U inversé. Cet étrier comprend un corps (3) comportant en saillie deux bras (8), ces bras (8) présentent des faces latérales internes planes et parallèles (4) aptes à venir en appui sur les deux plats (5) de l'arbre à cames, tandis que les extrémités transversales (7) sont coplanaires et s'étendent perpendiculairement auxdites faces parallèles (4).To achieve this positioning, a suitable monobloc tool is used, namely a stirrup in inverted U shape. This stirrup comprises a body (3) comprising two projecting arms (8), these arms (8) have planar and parallel internal lateral faces (4) capable of coming to bear on the two flats (5) of the shaft to cams, while the transverse ends (7) are coplanar and extend perpendicular to said parallel faces (4).

Il suffit alors, pour opérer le calage de l'arbre à cames (2), d'introduire les faces (4) de l'étrier au contact des plats (5) de l'arbre à cames (2) et de tourner ce dernier jusqu'à ce que les extrémités d'appui (7) de l'étrier (3) reposent sur la tablature (6).It then suffices, to operate the setting of the camshaft (2), to introduce the faces (4) of the caliper in contact with the plates (5) of the camshaft (2) and to turn this last until the support ends (7) of the stirrup (3) rest on the tablature (6).

Le positionnement des plats (5) à angle droit avec le plan de la tablature (6) génère deux positions angulaires de l'arbre à cames, à 180° l'une de l'autre. Pour déterminer laquelle des deux positions correspond au calage de l'arbre à cames et lever cette ambiguïté, on peut soit prépositionner l'arbre à cames au voisinage de sa position de calage : la soupape d'admission du cylindre 1 en position fermée (en correspondance avec la position de calage du vilebrequin piston cylindre 1 au point mort haut) et introduire l'étrier pour terminer le calage, ou bien prévoir un détrompeur tel qu'un ergot porté par l'étrier et coopérant avec un orifice défini dans l'arbre à cames, la réalisation d'un tel détrompeur peut être grossière puisqu'il s'agit simplement d'indiquer une orientation dans le positionnement des plats (5).The positioning of the dishes (5) at right angles to the plane of the tablature (6) generates two angular positions of the camshaft, 180 ° from one another. To determine which of the two positions corresponds to the timing of the camshaft and remove this ambiguity, one can either preposition the camshaft in the vicinity of its setting position: the intake valve of cylinder 1 in the closed position (in correspondence with the timing position of the crankshaft piston cylinder 1 in top dead center) and introduce the caliper to complete the timing, or else provide a keying device such as a lug carried by the caliper and cooperating with an orifice defined in the camshaft, the production of such a keying device can be rough since it is simply a matter of indicating an orientation in the positioning of the dishes (5).

La position angulaire de l'arbre à cames (2) est alors très précisément ajustée. On montre qu'avec des précisions de réalisation normales des plats (5), des différentes faces de références de l'étrier (4,7) et de la tablature (6) de la culasse (2), on positionne l'arbre à cames avec une dispersion de seulement 30 minutes d'angle.The angular position of the camshaft (2) is then very precisely adjusted. It is shown that with normal production details of the dishes (5), of the different reference faces of the stirrup (4,7) and of the tablature (6) of the cylinder head (2), the shaft is positioned at cams with a dispersion of only 30 minutes of angle.

L'arbre à cames (2) étant positionné, il suffit alors de fixer le pignon d'entraînement en extrémité d'arbre par simple vissage au couple et de mettre en place les autres éléments de la commande de distribution.The camshaft (2) being positioned, it then suffices to fix the drive pinion at the end of the shaft by simple screwing to the torque and to put in place the other elements of the distribution control.

La figure 3 décrit une variante de réalisation de l'invention, dans laquelle l'arbre à came (21) présente un repère de positionnement formé par un trou cylindrique (51) percé au voisinage d'une des extrémités longitudinales et au droit de la tablature (6) de la culasse (1). Le perçage (51) dont la directrice est perpendiculaire à l'axe longitudinal de l'arbre à cames (21) est également destiné à être positionné de manière prédéterminée par rapport au plan défini par la tablature supérieure (6) de la culasse (1).FIG. 3 describes an alternative embodiment of the invention, in which the camshaft (21) has a positioning mark formed by a cylindrical hole (51) drilled in the vicinity of one of the longitudinal ends and in line with the tablature (6) of the breech (1). The bore (51) whose directrix is perpendicular to the longitudinal axis of the camshaft (21) is also intended to be positioned in a predetermined manner relative to the plane defined by the upper tab (6) of the cylinder head (1 ).

Le calage de l'arbre à cames est opéré en positionnant le perçage (51) perpendiculaire au plan de la tablature (6), l'ambiguïté de positionnement étant levée conformément au dispositif décrit précédemment. On utilise pour opérer le calage un outil adapté monobloc en forme de M. L'outil présente un corps (31) muni d'une tige centrale cylindrique (41) apte à venir se loger dans le perçage (51) de l'arbre à cames (21), cette tige (41) étant entourée par deux bras sensiblement parallèles (81) comportant des extrémités d'appui (71) coplanaires s'étendent perpendiculairement à ladite tige (41).The timing of the camshaft is operated by positioning the bore (51) perpendicular to the plane of the tablature (6), the positioning ambiguity being removed in accordance with the device described above. A one-piece adapted tool in the form of an M is used for setting it. The tool has a body (31) provided with a cylindrical central rod (41) capable of being received in the bore (51) of the shaft to cams (21), this rod (41) being surrounded by two substantially parallel arms (81) having coplanar support ends (71) extend perpendicular to said rod (41).

Similairement au dispositif décrit précédemment, il suffit, pour opérer le calage de l'arbre à cames (21), d'introduire la tige (41) dans le perçage (51) de l'arbre à cames et de tourner ce dernier jusqu'à ce que les extrémités d'appui (71) de l'étrier (31) reposent à plat sur la tablature (6).Similar to the device described above, it suffices, to operate the timing of the camshaft (21), to introduce the rod (41) into the bore (51) of the camshaft and to turn the latter until that the support ends (71) of the stirrup (31) lie flat on the tablature (6).

Le dispositif qui vient d'être décrit conformément aux figures 1 à 4, est extrêmement simple à mettre en oeuvre puisqu'il ne nécessite en tout et pour tout que la réalisation des deux plats ou du perçage, en bout d'arbre à cames , alors que le clavetage nécessite la réalisation de deux perçages et la mise en place d'une pièce rapportée, ce qui pour des productions de grande série représente un gain important.The device which has just been described in accordance with FIGS. 1 to 4, is extremely simple to implement since it requires, in all and for all, only the production of the two plates or the drilling, at the end of the camshaft, while keying requires the production of two holes and the installation of an insert, which for mass production represents a significant gain.

D'autre par il permet un calage très précis de l'arbre à cames puisqu'il permet de limiter les dispersions à 30 minutes d'angles. Le dispositif présente de plus l'avantage d'être parfaitement insensible au variations du positionnement de l'arbre à cames par rapport à la culasse (contrairement à la méthode de calage selon l'art antérieur via la commande de distribution où toute variation d'entre-axe entre le vilebrequin et l'arbre à cames génère un déphasage). En effet l'outil ayant pour objet de mettre les surfaces de références de l'arbre à cames et de la culasse à angle droit, il est possible de déplacer les points de contact entre l'outil et ces surfaces de référence sans remettre en cause l'angularité.On the other hand, it allows very precise timing of the camshaft since it allows dispersions to be limited to 30 minutes of angles. The device also has the advantage of being perfectly insensitive to variations in the positioning of the camshaft relative to the cylinder head (unlike the setting method according to the prior art via the distribution control where any variation in distance between the crankshaft and the camshaft generates a phase shift). Indeed, the purpose of the tool is to set the reference surfaces of the camshaft and the cylinder head to Right angle, it is possible to move the contact points between the tool and these reference surfaces without calling into question the angularity.

Il est possible de retenir une autre valeur d'angle que l'angle droit pour opérer le calage de l'arbre à cames, excepté toutefois 0° où les surfaces de référence sont alors parallèles ce qui impose à l'arbre à cames d'être impérativement à la même hauteur du plan de la tablature.It is possible to retain a value of angle other than the right angle to operate the setting of the camshaft, except however 0 ° where the reference surfaces are then parallel which imposes on the camshaft be absolutely at the same height of the tablature plane.

Bien entendu, l'invention n'est nullement limitée aux modes de réalisation décrits et illustrés qui n'ont été donnés qu'à titre d'exemples.Of course, the invention is in no way limited to the embodiments described and illustrated which have been given only by way of examples.

Au contraire, l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont effectuées suivant son esprit. Ainsi la tablature supérieure de la culasse peut être remplacée comme surface de référence par le couvre-culasse.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. Thus the upper tab of the cylinder head can be replaced as a reference surface by the cylinder head cover.

Claims (13)

[1] Dispositif de positionnement angulaire d'un arbre à cames de moteur à combustion interne pour la mise en place des éléments de la commande de distribution, ledit arbre à cames (2,21) étant monté rotatif dans des paliers portés par la culasse (1), caractérisé en ce qu'il comporte au moins un repère (5,51) porté par l'arbre à cames (2,21), au moins un repère formé par une surface de référence plane (6) porté par la culasse (1) ou le couvre-culasse et des moyens de calage (3,31) aptes à coopérer avec chacun desdits repères de façon à immobiliser l'arbre à cames (2,21) dans une position angulaire prédéterminée. [1] Device for angular positioning of a camshaft of an internal combustion engine for the installation of the elements of the distribution control, said camshaft (2,21) being rotatably mounted in bearings carried by the cylinder head (1), characterized in that it comprises at least one mark (5.51) carried by the camshaft (2.21), at least one mark formed by a plane reference surface (6) carried by the cylinder head (1) or the cylinder head cover and wedging means (3,31) able to cooperate with each of said pins so as to immobilize the camshaft (2,21) in a predetermined angular position. [2] Dispositif de positionnement angulaire d'un arbre à cames selon la revendication 1, caractérisé en ce que ladite surface de référence portée par la culasse (1) est formée par la tablature supérieure (6). [2] Device for angular positioning of a camshaft according to claim 1, characterized in that said reference surface carried by the cylinder head (1) is formed by the upper tab (6). [3] Dispositif de positionnement angulaire d'un arbre à cames selon l'une quelconque des revendications 1 à 2, caractérisé en ce que lesdits moyens de calage (3,31) comportent au moins une première face (7,71) d'appui présentant une surface plane, ladite face (7,71) étant destinée à venir reposer sur ladite surface de référence (6) portée par la culasse(1). [3] Device for angular positioning of a camshaft according to any one of claims 1 to 2, characterized in that said wedging means (3.31) comprise at least a first face (7.71) of support having a flat surface, said face (7,71) being intended to come to rest on said reference surface (6) carried by the cylinder head (1). [4] Dispositif de positionnement angulaire d'un arbre à cames selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit repère porté par l'arbre à cames (2,21) est formé par au moins une surface de référence (5,51). [4] Device for angular positioning of a camshaft according to any one of claims 1 to 3, characterized in that said mark carried by the camshaft (2,21) is formed by at least one reference surface (5,51). [5] Dispositif de positionnement angulaire d'un arbre à cames selon les revendications 3 et 4, caractérisé en ce que d'une part, lesdits moyens de calage (3,31) comportent une seconde face d'appui (4,41) présentant une surface complémentaire à ladite surface de référence (5,51) de l'arbre à cames, ladite seconde face (4,41) étant destinée à venir au contact de ladite surface de référence (5,51) portée par l'arbre à cames et en ce que d'autre part, les première (7,71) et seconde (4,41) faces d'appui desdits moyens de calage (3,31) ne sont pas parallèles entre elles. [5] Device for angular positioning of a camshaft according to claims 3 and 4, characterized in that on the one hand, said wedging means (3.31) comprise a second bearing face (4.41) having a surface complementary to said reference surface (5.51) of the camshaft, said second face (4.41) being intended to come into contact with said reference surface (5.51) carried by the shaft cam and in that on the other hand, the first (7.71) and second (4.41) bearing faces of said wedging means (3.31) are not parallel to each other. [6] Dispositif de positionnement angulaire d'un arbre à cames selon la revendication 1 à 5, caractérisé en ce que ledit repère porté par l'arbre à cames (2) est défini par deux plats (5) parallèles usinés à la périphérie de l'arbre à cames (2), lesdits plats s'étendant parallèlement à l'axe longitudinal de l'arbre à cames (2). [6] Device for angular positioning of a camshaft according to claim 1 to 5, characterized in that said mark carried by the camshaft (2) is defined by two parallel plates (5) machined at the periphery of the camshaft (2), said plates extending parallel to the longitudinal axis of the camshaft (2). [7] Dispositif de positionnement angulaire d'un arbre à cames selon la revendication 1 à 4, caractérisé en ce que ledit repère porté par l'arbre à cames (21) est formé par un perçage cylindrique (51) s'étendant perpendiculairement à l'axe longitudinal de l'arbre à cames (21). [7] Device for angular positioning of a camshaft according to claim 1 to 4, characterized in that said mark carried by the camshaft (21) is formed by a cylindrical bore (51) extending perpendicularly to the longitudinal axis of the camshaft (21). [8] Dispositif de positionnement angulaire d'un arbre à cames selon la revendication 7, caractérisé en ce que lesdits moyens de calage sont constitués par un outil monobloc (3) comportant deux faces parallèles (4) destinées à venir enserrer les deux plats (5) de l'arbre à cames (2) et une surface d'appui (7) destinée à reposer sur la surface de référence (6) de la culasse (1). [8] Device for angular positioning of a camshaft according to claim 7, characterized in that said setting means are constituted by a monobloc tool (3) comprising two faces parallel (4) intended to grip the two plates (5) of the camshaft (2) and a bearing surface (7) intended to rest on the reference surface (6) of the cylinder head (1). [9] Dispositif de positionnement angulaire d'un arbre à cames selon la revendication 10, caractérisé en ce que ledit outil est constitué par un étrier en forme de U, ledit étrier étant formé par un corps (3) comportant en saillie deux bras (8), lesdits bras (8) présentant des faces latérales (4) en regard parallèles et droites destinées à venir au contact des plats (5) portés par l'arbre à cames (2) et des extrémités transversales (7) coplanaires destinées à reposer à plat sur la surface de référence (6) de la culasse (1). [9] Device for angular positioning of a camshaft according to claim 10, characterized in that said tool consists of a U-shaped stirrup, said stirrup being formed by a body (3) projecting two arms ( 8), said arms (8) having lateral faces (4) facing parallel and straight intended to come into contact with the dishes (5) carried by the camshaft (2) and transverse ends (7) coplanar intended to rest flat on the reference surface (6) of the cylinder head (1). [10] Dispositif de positionnement angulaire d'un arbre à cames selon la revendication 7, caractérisé en ce que lesdits moyens de calage sont formés par un outil monobloc en forme de M, comportant un corps (31) muni en saillie d'une tige cylindrique (41) destinées à être introduite dans le perçage (51) porté par l'arbre à cames (21) et de deux bras (81) s'étendant de part et d'autre de la dite tige (41), lesdits bras (81) présentant des extrémités transversales coplanaires (71) destinées à reposer à plat sur la surface de référence (6) de la culasse.(1) [10] Device for angular positioning of a camshaft according to claim 7, characterized in that said wedging means are formed by a one-piece M-shaped tool, comprising a body (31) projecting from a rod cylindrical (41) intended to be introduced into the bore (51) carried by the camshaft (21) and two arms (81) extending on either side of said rod (41), said arms (81) having coplanar transverse ends (71) intended to lie flat on the reference surface (6) of the cylinder head. (1) [11] Dispositif de positionnement angulaire d'un arbre à cames selon l'une quelconque des revendications 1 à 10, caractérisé en ce que l'arbre à cames (2,21) présente un second repère permettant de préciser l'orientation de la surface de référence (5,51) portée par l'arbre à cames (2, 21). [11] Device for angular positioning of a camshaft according to any one of claims 1 to 10, characterized in that the camshaft (2,21) has a second mark used to specify the orientation of the reference surface (5.51) carried by the camshaft (2, 21). [12] Dispositif de positionnement angulaire d'un arbre à cames selon l'une quelconque des revendications 5 à 10, caractérisé en ce que lesdites première (4,41) et seconde (7,71) faces d'appui desdits moyens de calage (3,31) s'étendent perpendiculairement l'une à l'autre. [12] Device for angular positioning of a camshaft according to any one of claims 5 to 10, characterized in that said first (4,41) and second (7,71) bearing faces of said wedging means (3.31) extend perpendicular to each other. [13] Arbre à cames de moteur à combustion interne agencé pour un dispositif de positionnement angulaire selon l'une quelconque des revendications 1 à 12. [13] Camshaft of an internal combustion engine arranged for an angular positioning device according to any one of claims 1 to 12.
EP92402273A 1991-09-13 1992-08-12 Positionning device for the camshaft of an internal combustion engine and camshaft using this device Withdrawn EP0532377A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9111308 1991-09-13
FR9111308A FR2681376A1 (en) 1991-09-13 1991-09-13 DEVICE FOR POSITIONING A CAMSHAFT OF AN INTERNAL COMBUSTION ENGINE AND CAMSHAFT USING THE SAME.

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US5845397A (en) * 1997-02-21 1998-12-08 Cummins Engine Company, Inc. Static timing method for heavy duty diesel engines
WO2004106716A1 (en) * 2003-05-30 2004-12-09 International Engines South America Ltda. An internal combustion engine and an engine housing
AT501132A1 (en) * 2004-11-11 2006-06-15 Avl List Gmbh Cylinder head arrangement for internal combustion engine, has cylinder head with gas exchange valves for cylinders that are actuated via bucket tappets by camshafts, where camshafts are rotatably mounted inside cylinder head cover
FR2885661A1 (en) * 2005-05-12 2006-11-17 Renault Soc Par Actions Simpli Internal combustion engine, especially for an automobile, comprises balance shafts with holes aligned to receive a removable fastener before mounting on the engine block
US20120152191A1 (en) * 2009-12-07 2012-06-21 Daisuke Yoshika Variable valve actuation device for internal combustion engine
CN112228177A (en) * 2020-11-02 2021-01-15 安徽华菱汽车有限公司 Engine camshaft assembly timing structure

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FR3021995B1 (en) * 2014-06-06 2016-07-01 Peugeot Citroen Automobiles Sa DEVICE FOR POSITIONING A CAMSHAFT

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DE3926430A1 (en) * 1989-08-10 1991-02-14 Audi Ag IC engine with at least two camshafts - has tool interlocking with and fixing camshafts w.r.t. each other to allow correct setting of angular positions

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DE3738629A1 (en) * 1986-11-25 1988-06-01 Steyr Daimler Puch Ag Device for turning the camshaft of a reciprocating internal combustion engine into its basic position relative to the crankshaft rotational position
DE3926430A1 (en) * 1989-08-10 1991-02-14 Audi Ag IC engine with at least two camshafts - has tool interlocking with and fixing camshafts w.r.t. each other to allow correct setting of angular positions

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5845397A (en) * 1997-02-21 1998-12-08 Cummins Engine Company, Inc. Static timing method for heavy duty diesel engines
WO2004106716A1 (en) * 2003-05-30 2004-12-09 International Engines South America Ltda. An internal combustion engine and an engine housing
CN100432393C (en) * 2003-05-30 2008-11-12 国际引擎南美有限公司 An internal combustion engine and an engine housing
AT501132B1 (en) * 2004-11-11 2006-11-15 Avl List Gmbh Cylinder head arrangement for internal combustion engine, has cylinder head with gas exchange valves for cylinders that are actuated via bucket tappets by camshafts, where camshafts are rotatably mounted inside cylinder head cover
AT501132A1 (en) * 2004-11-11 2006-06-15 Avl List Gmbh Cylinder head arrangement for internal combustion engine, has cylinder head with gas exchange valves for cylinders that are actuated via bucket tappets by camshafts, where camshafts are rotatably mounted inside cylinder head cover
FR2885661A1 (en) * 2005-05-12 2006-11-17 Renault Soc Par Actions Simpli Internal combustion engine, especially for an automobile, comprises balance shafts with holes aligned to receive a removable fastener before mounting on the engine block
WO2007003812A3 (en) * 2005-05-12 2007-03-08 Renault Sa Heat engine comprising balance shafts which can be locked by a pin
US7921825B2 (en) 2005-05-12 2011-04-12 Renault S.A.S. Engine comprising balance shafts locked by a pin
US20120152191A1 (en) * 2009-12-07 2012-06-21 Daisuke Yoshika Variable valve actuation device for internal combustion engine
CN102695852A (en) * 2009-12-07 2012-09-26 三菱自动车工业株式会社 Variable valve gear for internal combustion engine
EP2511488A1 (en) * 2009-12-07 2012-10-17 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Variable valve gear for internal combustion engine
EP2511488A4 (en) * 2009-12-07 2013-04-10 Mitsubishi Motors Corp Variable valve gear for internal combustion engine
CN102695852B (en) * 2009-12-07 2014-11-26 三菱自动车工业株式会社 Variable valve gear for internal combustion engine
US8939117B2 (en) 2009-12-07 2015-01-27 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Variable valve actuation device for internal combustion engine
CN112228177A (en) * 2020-11-02 2021-01-15 安徽华菱汽车有限公司 Engine camshaft assembly timing structure

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Publication number Publication date
FR2681376A1 (en) 1993-03-19
FR2681376B1 (en) 1995-04-07

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