EP3240946A1 - Timing finger followers stopped axially by the pivot and by the cylinder head - Google Patents

Timing finger followers stopped axially by the pivot and by the cylinder head

Info

Publication number
EP3240946A1
EP3240946A1 EP15817986.1A EP15817986A EP3240946A1 EP 3240946 A1 EP3240946 A1 EP 3240946A1 EP 15817986 A EP15817986 A EP 15817986A EP 3240946 A1 EP3240946 A1 EP 3240946A1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
axis
arrangement according
distribution
hinge
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.)
Granted
Application number
EP15817986.1A
Other languages
German (de)
French (fr)
Other versions
EP3240946B1 (en
Inventor
Jean-Francois Moulin
Etienne DE-MALET
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
Original Assignee
Renault SAS
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 filed Critical Renault SAS
Publication of EP3240946A1 publication Critical patent/EP3240946A1/en
Application granted granted Critical
Publication of EP3240946B1 publication Critical patent/EP3240946B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L2001/187—Clips, e.g. for retaining rocker arm on pivot

Definitions

  • Dispense valves stopped axially by the hinge pin and the cylinder head
  • the invention relates to an arrangement for a motor vehicle, comprising a cylinder head of a heat engine, a camshaft rotating relative to the cylinder head, at least one hinge pin fixed on the cylinder head and offset with respect to the axis. rotation of the camshaft.
  • the invention also relates to a motor vehicle as such, comprising at least one such arrangement.
  • the object of the present invention is to provide an arrangement for a motor vehicle that overcomes the disadvantages listed above.
  • an object of the invention is to provide such an arrangement that is both simple design and implementation, inexpensive, reliable, and easy to integrate in situations of reduced size at the cylinder head.
  • This object can be achieved by means of an arrangement for a motor vehicle comprising a cylinder head of a heat engine, a camshaft rotating relative to the cylinder head, at least one hinge pin fixed on the cylinder head and offset relative to the axis of rotation of the cam shaft, and at least one distribution latch for controlling the intake and exhaust valves of the engine, mounted on the hinge pin and actuated according to an oscillating tilting movement about the hinge axis by a rotary cam of the camshaft, in which the axial stops of the distribution latch along the hinge axis are constituted by a blocking wall axial delimited by the cylinder head on the one hand and the axis of articulation on the other hand.
  • the hinge pin On the opposite side to said axial locking wall with respect to the distribution pawl, the hinge pin can form a shoulder delimiting an axial locking face, said axial locking face and said locking wall forming axial stops in the directions opposite for the distribution latch.
  • Each hinge axis can ensure the mounting of two angularly free distribution latches relative to each other about the hinge axis.
  • Each hinge axis may comprise two pivot shafts aligned with each other and each ensuring the sliding pivot connection mounting of a corresponding distribution latch.
  • An axial clearance may be present between the distribution latch and the swingarm hinge pin on the one hand, and the axial locking wall on the other hand, between 0.05 mm and 0.2 mm.
  • the hinge axis is preferably constituted by a part, in particular of monobloc type or in one piece, independent of the yoke and fixed on a bearing face delimited by the yoke.
  • the fastening elements of the hinge pin on the yoke comprise on the one hand at least one centering pin and secondly at least one fixing screw immobilizing the hinge axis of oscillation arm relative to the cylinder head in the position defined by the mechanical cooperation between each centering pin and the cylinder head, each centering pin and each fastening screw passing through through holes formed through the swingarm articulation axis.
  • the hinge axis may be parallel to the cam shaft.
  • each distribution latch may comprise an area in mechanical contact with the cam and mechanically biasing a tail of a valve intended to be actuated in its translational movement by the movement oscillating distribution latch.
  • the arrangement comprises a setting pad interposed between the valve and the dispensing latch.
  • a motor vehicle may include at least one such arrangement.
  • FIG. 1, already described, is a perspective view of an example of a known arrangement of the prior art
  • FIG. 2 is a sectional view along a sectional plane A-A of an exemplary arrangement according to the invention
  • FIG. 3 is a sectional view along a sectional plane B-B visible in FIG. 2, of the exemplary arrangement shown in FIG. 2,
  • FIG. 4 is a sectional view along a sectional plane C-C visible in FIG. 2, of the exemplary arrangement illustrated in FIGS. 2 and 3,
  • FIG. 5 is a sectional view along a plane of section D-D visible in FIG. 3, of the exemplary arrangement shown in FIGS. 2 to 4, and
  • FIG. 6 is a perspective view of an exemplary hinge pin as used in the arrangement of FIGS. 2 to 5.
  • a motor vehicle comprising a cylinder head 10 of a heat engine, a cam shaft 1 1 in rotation relative to the cylinder head 10, at least one hinge axis 15 fixed on the yoke 10 and offset relative to the axis of rotation of the cam shaft January 1.
  • the cylinder head 10 may optionally be equipped with a cylinder head cover 12 attached to an upper face of the monobloc remainder of the cylinder head 10.
  • the fixing of the camshaft 1 1 on the cylinder head 10 can in particular be done in the lower part by this breech block and in the upper part by the cylinder head cover 12, substantially in the manner of two shells immobilizing bearings or bearings.
  • the invention also relates to a motor vehicle as such, comprising at least one such arrangement.
  • the arrangement also comprises at least one distribution latch 14 for controlling the intake and exhaust valves 13 of the heat engine, mounted on the hinge pin 15 and actuated in an oscillating motion tilting around the hinge axis 15 by a rotary cam 1 1 1 of the cam shaft 1 January.
  • the axial stops of the distribution latch 14 along the axis of articulation 15 are constituted by an axial locking wall 101 delimited by the yoke 10 on the one hand, and by the hinge pin 15 on the other hand , especially at an appropriate element of the articulation axis 15.
  • the term “distribution latch” can equally well be replaced by the term “swingarm”, since such a swingarm is configured so that it can perform the aforementioned function vis-à-vis of the valve 13 associated with it.
  • the hinge pin 15 forms in particular a shoulder delimiting an axial locking face 157.
  • the axial locking face 157 and the locking wall 101 form axial stops in opposite directions for the distribution latch 14 arranged and thus maintained axially between them.
  • Each hinge pin 15 preferably provides for the mounting of two angularly free distribution tongues 14 relative to one another about the hinge axis 15.
  • each hinge pin 15 can in particular comprise two pivot shafts 151 aligned with each other in the axial direction and each ensuring the sliding pivot connection assembly of a corresponding distribution latch 14.
  • Each pivot shaft 151 delimits at its distal end an axial face 155 intended to come opposite a corresponding axial locking wall 101.
  • a mounting clearance may be interposed between this axial face 155 and the axial locking wall 101, typically between 0.2 mm and 1 mm.
  • the hinge pin 15 is disposed between two axial locking walls 101 defined by the yoke 10 and spaced apart by a distance greater than the distance separating the two axial faces 155 that comprises the hinge pin 15 between them. The difference between these two distances defines the editing games mentioned in the previous paragraph.
  • an axial clearance is present between the distribution latch 14 and the axial locking face 157 of the hinge pin 15 on the one hand, and the axial locking wall 101 on the other hand, typically between 0 , 05 mm and 0.2 mm.
  • the adjustment between the articulation axis 15 and the pawl 14 is preferably sliding axial type, such as a standardized adjustment type H7g6.
  • each hinge pin 15 can ensure the mounting of a distribution latch 14 which is mounted angularly free around the axis of articulation 15.
  • each hinge axis 15 may include in particular a single pivot shaft 151 ensuring the sliding pivot connection assembly of the distribution latch 14.
  • the hinge pin 15 is constituted by a part, in particular of monobloc or integral type, independent of the yoke 10 and fixed on a bearing surface 102 delimited by the cylinder head 10.
  • the hinge pin 15 delimits, in particular in its lower part, a bearing face 152 coming into direct contact against the bearing surface 102 of the 10. This contact provides a plane-support connection for the hinge pin 15 with respect to the yoke 10.
  • the arrangement comprises fastening elements of the hinge pin 15 on the yoke 10.
  • each centering pin 16 which can comprise on the one hand at least one centering pin 16 (and secondly at least one fixing screw 17 (immobilizing the axis of articulation 15 with respect to the cylinder head 10 in the position defined by the mechanical cooperation between each centering pin 16 and the cylinder head 10, each centering pin 16 and each fixing screw 17 passing through through-holes 153, 154, 156 formed through the hinge axis 15.
  • the fastening elements of the hinge pin 15 on the yoke 10 comprise two centering pins 16, as made visible in FIG. 4, making it possible to obtain a precision in the positioning of the hinge pin 15 on the cylinder head 10.
  • the light 153 to be traversed by a centering pin 16 and the slot 156 to be traversed by the fastening screw 17 may be of circular section.
  • By against the light 154 to be traversed by the other centering pin 16 may have a section of oblong shape, whose length is oriented in the direction of pivoting latches 14.
  • the hinge pin 15 is parallel to the cam shaft 11. Adjustment of the parallelism is possible via the fixing elements or any other dedicated organ.
  • each distribution latch 14 comprises a zone in mechanical contact with the cam 1 1 1 and mechanically biasing a tail of a valve 13 intended to be actuated in its translational movement by the oscillating movement of the dispensing latch 14.
  • the arrangement may also comprise a setting pad 18 interposed between the valve 13 and the distribution latch 14.
  • the hinge axis 15, the centering pins 16 and the distribution latches 14 will preferably be made of steel.
  • the hinge pin 15 may be heat-treated to reduce its wear phenomenon at the level of the shafts 151 and possibly coated with a coating or a deposit, in particular a carbonaceous material obtained in the form of a thin layer, for example of the "DLC" type. (For "Diamond Like Carbon” in English terminology).
  • the assembly of the previously detailed arrangement can be carried out as follows.
  • the hinge axis 15 will preferably be configured so that it jointly maintains at least one distribution latch, here the two distribution latches 14, before being fixed on the yoke 10 by screwing via the fastening screw 17
  • the hinge axis 15 will be positioned as parallel as possible to the cam shaft 11, via at least one centering pin 16 provided for this purpose.
  • the latches 14 will be mounted on the hinge pin 15 by the shafts 151. Then, the assembly will be placed on the face 102 of the yoke 10, where the two centering pins 16 and the fixing screw 17 will lock the hinge pin 15 relative to the yoke 10.
  • the distribution latches 14 will articulate around the respective shafts 151 and each will be locked axially in translation, on its shaft 151, by the wall 101 of the yoke 10 on the one hand and by an appropriate element of the hinge pin 15 itself, avoiding any recourse to any other external part to this arrangement as defined herein.
  • the preceding solution advantageously makes it possible to maintain two distribution latches 14 with a single component part of the hinge pin 15 and a single screw 17. This results in a very advantageous saving of parts, allowing a saving of space, weight, cost of manufacture and assembly.
  • the solution just described has the advantage of being both simple design and implementation, inexpensive, reliable, and easy to integrate in situations of reduced size at the breech.

Landscapes

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

Abstract

A motor vehicle arrangement comprises a cylinder head (10) of a combustion engine, a camshaft (11) rotating with respect to the cylinder head (10), at least one pivot (15) fixed to the cylinder head (10) and offset from the axis of rotation of the camshaft (11), and at least one timing finger follower (14) intended to operate the inlet and exhaust valves (13) of the combustion engine, which follower is mounted on the pivot (15) and actuated in an oscillatory rocking movement about the pivot (15) by a rotary cam (111) of the camshaft (11). The axial stops for the timing finger follower (14) along the pivot (15) are constituted by an axial immobilization wall (101) delimited by the cylinder head (10) on the one hand, and by the pivot (15) on the other.

Description

Linguets de distribution arrêtés axialement par l'axe d'articulation et par la culasse  Dispense valves stopped axially by the hinge pin and the cylinder head
Domaine technique de l'invention Technical field of the invention
L'invention concerne un agencement pour véhicule automobile, comprenant une culasse d'un moteur thermique, un arbre à came en rotation par rapport à la culasse, au moins un axe d'articulation fixé sur la culasse et décalé par rapport à l'axe de rotation de l'arbre à came. The invention relates to an arrangement for a motor vehicle, comprising a cylinder head of a heat engine, a camshaft rotating relative to the cylinder head, at least one hinge pin fixed on the cylinder head and offset with respect to the axis. rotation of the camshaft.
L'invention concerne aussi un véhicule automobile en tant que tel, comprenant au moins un tel agencement. The invention also relates to a motor vehicle as such, comprising at least one such arrangement.
État de la technique State of the art
En référence à la figure 1 , il est connu un tel agencement dans lequel l'arbre à came 3 transmet un mouvement rectiligne aux soupapes 1 par l'intermédiaire des culbuteurs 4. Chaque soupape 1 est sollicitée par un ressort 2 en contre-réaction à la sollicitation mécanique du culbuteur 4 correspondant. Les culbuteurs 4 pivotent autour d'un axe d'articulation 5 pour le guidage à pivotement des culbuteurs 4. Ils sont arrêtés en translation, suivant la direction axiale, par les ressorts d'appui 8 et par les plaquettes de distribution 7. L'axe d'articulation 5 est fixé dans la culasse par l'intermédiaire des vis de fixation 6. With reference to FIG. 1, there is known such an arrangement in which the camshaft 3 transmits a rectilinear movement to the valves 1 via the rocker arms 4. Each valve 1 is biased by a spring 2 in counter-reaction to the mechanical stress of the corresponding rocker 4. The rockers 4 pivot about a pivot axis 5 for the pivoting guide rocker arms 4. They are stopped in translation, in the axial direction, by the support springs 8 and the distribution plates 7. The hinge pin 5 is fixed in the cylinder head by means of fixing screws 6.
Un tel agencement donne satisfaction dans son fonctionnement mais est relativement complexe tant dans sa conception que son montage, est onéreux et présente des difficultés d'intégration dans un encombrement réduit, ce qui est la tendance actuelle au niveau du développement des moteurs thermiques et des architectures de compartiments moteurs. Such an arrangement is satisfactory in its operation but is relatively complex both in its design and assembly, is expensive and has difficulties of integration in a clutter reduced, which is the current trend in the development of thermal engines and architectures engine compartments.
Objet de l'invention Object of the invention
Le but de la présente invention est de proposer un agencement pour véhicule automobile qui remédie aux inconvénients listés ci-dessus. The object of the present invention is to provide an arrangement for a motor vehicle that overcomes the disadvantages listed above.
Notamment, un objet de l'invention est de fournir un tel agencement qui soit à la fois simple de conception et de mise en œuvre, peu onéreux, fiable, et facile à intégrer dans des situations d'encombrement réduit au niveau de la culasse. In particular, an object of the invention is to provide such an arrangement that is both simple design and implementation, inexpensive, reliable, and easy to integrate in situations of reduced size at the cylinder head.
Ce but peut être atteint par l'intermédiaire d'un agencement pour véhicule automobile, comprenant une culasse d'un moteur thermique, un arbre à came en rotation par rapport à la culasse, au moins un axe d'articulation fixé sur la culasse et décalé par rapport à l'axe de rotation de l'arbre à came, et au moins un linguet de distribution destiné à la commande des soupapes d'admission et d'échappement du moteur thermique, monté sur l'axe d'articulation et actionné selon un mouvement oscillant de basculement autour de l'axe d'articulation par une came rotative de l'arbre à came, dans lequel les arrêts axiaux du linguet de distribution le long de l'axe d'articulation sont constitués par une paroi de blocage axial délimitée par la culasse d'une part et par l'axe d'articulation d'autre part. This object can be achieved by means of an arrangement for a motor vehicle comprising a cylinder head of a heat engine, a camshaft rotating relative to the cylinder head, at least one hinge pin fixed on the cylinder head and offset relative to the axis of rotation of the cam shaft, and at least one distribution latch for controlling the intake and exhaust valves of the engine, mounted on the hinge pin and actuated according to an oscillating tilting movement about the hinge axis by a rotary cam of the camshaft, in which the axial stops of the distribution latch along the hinge axis are constituted by a blocking wall axial delimited by the cylinder head on the one hand and the axis of articulation on the other hand.
Du côté opposé à ladite paroi de blocage axial par rapport au linguet de distribution, l'axe d'articulation peut former un épaulement délimitant une face de blocage axial, ladite face de blocage axial et ladite paroi de blocage formant des arrêts axiaux dans des sens opposés pour le linguet de distribution. Chaque axe d'articulation peut assurer le montage de deux linguets de distribution angulairement libres l'un par rapport à l'autre autour de l'axe d'articulation. Chaque axe d'articulation peut comprendre deux arbres de pivotement alignés entre eux et assurant chacun le montage à liaison pivot glissant d'un linguet de distribution correspondant. On the opposite side to said axial locking wall with respect to the distribution pawl, the hinge pin can form a shoulder delimiting an axial locking face, said axial locking face and said locking wall forming axial stops in the directions opposite for the distribution latch. Each hinge axis can ensure the mounting of two angularly free distribution latches relative to each other about the hinge axis. Each hinge axis may comprise two pivot shafts aligned with each other and each ensuring the sliding pivot connection mounting of a corresponding distribution latch.
Un jeu axial peut être présent entre le linguet de distribution et l'axe d'articulation de bras oscillant d'une part, et la paroi de blocage axial d'autre part, compris entre 0,05 mm et 0,2 mm. An axial clearance may be present between the distribution latch and the swingarm hinge pin on the one hand, and the axial locking wall on the other hand, between 0.05 mm and 0.2 mm.
L'axe d'articulation est de préférence constitué par une pièce, notamment de type monobloc ou d'un seul tenant, indépendante de la culasse et fixée sur une face d'appui délimitée par la culasse. The hinge axis is preferably constituted by a part, in particular of monobloc type or in one piece, independent of the yoke and fixed on a bearing face delimited by the yoke.
Les éléments de fixation de l'axe d'articulation sur la culasse comprennent d'une part au moins un pion de centrage et d'autre part au moins une vis de fixation immobilisant l'axe d'articulation de bras oscillant par rapport à la culasse dans la position définie par la coopération mécanique entre chaque pion de centrage et la culasse, chaque pion de centrage et chaque vis de fixation traversant des lumières traversantes ménagées à travers l'axe d'articulation de bras oscillant. L'axe d'articulation peut être parallèle à l'arbre à came. The fastening elements of the hinge pin on the yoke comprise on the one hand at least one centering pin and secondly at least one fixing screw immobilizing the hinge axis of oscillation arm relative to the cylinder head in the position defined by the mechanical cooperation between each centering pin and the cylinder head, each centering pin and each fastening screw passing through through holes formed through the swingarm articulation axis. The hinge axis may be parallel to the cam shaft.
Du côté opposé à sa zone de liaison à l'axe de pivotement, chaque linguet de distribution peut comprendre une zone en contact mécanique avec la came et sollicitant mécaniquement une queue d'une soupape destinée à être actionnée dans son mouvement de translation par le mouvement oscillant du linguet de distribution. Sur la queue de la soupape, l'agencement comprend une pastille de réglage interposée entre la soupape et le linguet de distribution. Un véhicule automobile peut comprendre au moins un tel agencement. Description sommaire des dessins On the side opposite to its zone of connection to the axis of pivoting, each distribution latch may comprise an area in mechanical contact with the cam and mechanically biasing a tail of a valve intended to be actuated in its translational movement by the movement oscillating distribution latch. On the tail of the valve, the arrangement comprises a setting pad interposed between the valve and the dispensing latch. A motor vehicle may include at least one such arrangement. Brief description of the drawings
D'autres avantages et caractéristiques assortiront plus clairement de la description qui va suivre de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés sur les dessins annexés, dans lesquels : Other advantages and features will more clearly show the following description of particular embodiments of the invention given as non-restrictive examples and shown in the accompanying drawings, in which:
- la figure 1 , déjà décrite, est une vue en perspective d'un exemple d'agencement connu de l'art antérieur,  FIG. 1, already described, is a perspective view of an example of a known arrangement of the prior art,
- la figure 2 est une vue en coupe selon un plan de coupe A-A d'un exemple d'agencement selon l'invention,  FIG. 2 is a sectional view along a sectional plane A-A of an exemplary arrangement according to the invention,
- la figure 3 est une vue en coupe selon un plan de coupe B-B visible sur la figure 2, de l'exemple d'agencement illustré sur la figure 2,  FIG. 3 is a sectional view along a sectional plane B-B visible in FIG. 2, of the exemplary arrangement shown in FIG. 2,
- la figure 4 est une vue en coupe selon un plan de coupe C-C visible sur la figure 2, de l'exemple d'agencement illustré sur les figures 2 et 3,  FIG. 4 is a sectional view along a sectional plane C-C visible in FIG. 2, of the exemplary arrangement illustrated in FIGS. 2 and 3,
- la figure 5 est une vue en coupe selon un plan de coupe D-D visible sur la figure 3, de l'exemple d'agencement représenté sur les figures 2 à 4, et  FIG. 5 is a sectional view along a plane of section D-D visible in FIG. 3, of the exemplary arrangement shown in FIGS. 2 to 4, and
- la figure 6 est une vue en perspective d'un exemple d'axe d'articulation tel qu'utilisé dans l'agencement des figures 2 à 5.  FIG. 6 is a perspective view of an exemplary hinge pin as used in the arrangement of FIGS. 2 to 5.
Description de modes préférentiels de l'invention L'invention qui va maintenant être décrite, en référence aux figures 2 à 6, concerne de manière générale un agencement pour véhicule automobile, comprenant une culasse 10 d'un moteur thermique, un arbre à came 1 1 en rotation par rapport à la culasse 10, au moins un axe d'articulation 15 fixé sur la culasse 10 et décalé par rapport à l'axe de rotation de l'arbre à came 1 1 . La culasse 10 peut éventuellement être équipée d'un couvre- culasse 12, rapportée sur une face supérieure du reste monobloc de la culasse 10. La fixation de l'arbre à came 1 1 sur la culasse 10 peut notamment se faire en partie inférieure par ce bloc de culasse et en partie supérieure par le couvre-culasse 12, sensiblement à la manière de deux coquilles immobilisant des paliers ou des roulements. Description of preferred modes of the invention The invention will now be described, with reference to Figures 2 to 6, relates generally to an arrangement for a motor vehicle, comprising a cylinder head 10 of a heat engine, a cam shaft 1 1 in rotation relative to the cylinder head 10, at least one hinge axis 15 fixed on the yoke 10 and offset relative to the axis of rotation of the cam shaft January 1. The cylinder head 10 may optionally be equipped with a cylinder head cover 12 attached to an upper face of the monobloc remainder of the cylinder head 10. The fixing of the camshaft 1 1 on the cylinder head 10 can in particular be done in the lower part by this breech block and in the upper part by the cylinder head cover 12, substantially in the manner of two shells immobilizing bearings or bearings.
L'invention concerne aussi un véhicule automobile en tant que tel, comprenant au moins un tel agencement. The invention also relates to a motor vehicle as such, comprising at least one such arrangement.
Selon une caractéristique importante, l'agencement comprend aussi au moins un linguet de distribution 14 destiné à la commande des soupapes 13 d'admission et d'échappement du moteur thermique, monté sur l'axe d'articulation 15 et actionné selon un mouvement oscillant de basculement autour de l'axe d'articulation 15 par une came rotative 1 1 1 de l'arbre à came 1 1 . Les arrêts axiaux du linguet de distribution 14 le long de l'axe d'articulation 15 sont constitués par une paroi de blocage axial 101 délimitée par la culasse 10 d'une part, et par l'axe d'articulation 15 d'autre part, notamment au niveau d'un élément idoine de l'axe d'articulation 15. According to an important characteristic, the arrangement also comprises at least one distribution latch 14 for controlling the intake and exhaust valves 13 of the heat engine, mounted on the hinge pin 15 and actuated in an oscillating motion tilting around the hinge axis 15 by a rotary cam 1 1 1 of the cam shaft 1 January. The axial stops of the distribution latch 14 along the axis of articulation 15 are constituted by an axial locking wall 101 delimited by the yoke 10 on the one hand, and by the hinge pin 15 on the other hand , especially at an appropriate element of the articulation axis 15.
Dans tout ce document, le terme « linguet de distribution » peut indifféremment être remplacé par le terme « bras oscillant », dès lors qu'un tel bras oscillant est configuré de telle sorte qu'il puisse remplir la fonction pré-mentionnée vis-à-vis de la soupape 13 qui lui est associée. Du côté opposé à la paroi de blocage axial 101 par rapport au linguet de distribution 14, l'axe d'articulation 15 forme notamment un épaulement délimitant une face de blocage axial 157. La face de blocage axial 157 et la paroi de blocage 101 forment des arrêts axiaux dans des sens opposés pour le linguet de distribution 14 disposé et ainsi maintenu axialement entre elles. Throughout this document, the term "distribution latch" can equally well be replaced by the term "swingarm", since such a swingarm is configured so that it can perform the aforementioned function vis-à-vis of the valve 13 associated with it. On the opposite side to the axial locking wall 101 relative to the distribution pawl 14, the hinge pin 15 forms in particular a shoulder delimiting an axial locking face 157. The axial locking face 157 and the locking wall 101 form axial stops in opposite directions for the distribution latch 14 arranged and thus maintained axially between them.
Chaque axe d'articulation 15 assure de préférence le montage de deux linguets de distribution 14 angulairement libres l'un par rapport à l'autre autour de l'axe d'articulation 15. A cet effet, chaque axe d'articulation 15 peut notamment comprendre deux arbres de pivotement 151 alignés entre eux selon la direction axiale et assurant chacun le montage à liaison pivot glissant d'un linguet de distribution 14 correspondant. Chaque arbre de pivotement 151 délimite à son extrémité distale une face axiale 155, destinée à venir en regard d'une paroi de blocage axial 101 correspondante. Un jeu de montage peut être interposé entre cette face axiale 155 et la paroi de blocage axial 101 , typiquement compris entre 0.2 mm et 1 mm. Each hinge pin 15 preferably provides for the mounting of two angularly free distribution tongues 14 relative to one another about the hinge axis 15. For this purpose, each hinge pin 15 can in particular comprise two pivot shafts 151 aligned with each other in the axial direction and each ensuring the sliding pivot connection assembly of a corresponding distribution latch 14. Each pivot shaft 151 delimits at its distal end an axial face 155 intended to come opposite a corresponding axial locking wall 101. A mounting clearance may be interposed between this axial face 155 and the axial locking wall 101, typically between 0.2 mm and 1 mm.
Ainsi, l'axe d'articulation 15 est disposé entre deux parois de blocage axial 101 délimitées par la culasse 10 et distantes entre elles d'une distance supérieure à la distance séparant les deux faces axiales 155 que comprend l'axe d'articulation 15 entre elles. La différence entre ces deux distances définit les jeux de montage évoqués au paragraphe précédent. Thus, the hinge pin 15 is disposed between two axial locking walls 101 defined by the yoke 10 and spaced apart by a distance greater than the distance separating the two axial faces 155 that comprises the hinge pin 15 between them. The difference between these two distances defines the editing games mentioned in the previous paragraph.
Préférentiel lement, un jeu axial est présent entre le linguet de distribution 14 et la face de blocage axial 157 de l'axe d'articulation 15 d'une part, et la paroi de blocage axial 101 d'autre part, typiquement compris entre 0,05 mm et 0,2 mm. L'ajustement entre l'axe d'articulation 15 et le linguet de distribution 14 est de préférence de type axial glissant, tel qu'un ajustement normé de type H7g6. Preferably, an axial clearance is present between the distribution latch 14 and the axial locking face 157 of the hinge pin 15 on the one hand, and the axial locking wall 101 on the other hand, typically between 0 , 05 mm and 0.2 mm. The adjustment between the articulation axis 15 and the pawl 14 is preferably sliding axial type, such as a standardized adjustment type H7g6.
Plus précisément, il est possible de prévoir un premier jeu d'un coté, entre le linguet de distribution 14 et la face 157 de l'axe d'articulation 15 et un deuxième jeu de l'autre côté, entre le linguet de distribution 14 et la paroi de blocage axial 101 . Ces jeux sont illustrés sur les figures 3 et 4 via les annotations « JEU ». Cette disposition présente l'intérêt entre autres de permettre de maintenir le linguet de distribution 14 dans la culasse 10, de manière articulée par rapport aux soupapes 13 et à l'arbre à came 1 1 , avec un jeu latéral sur ses deux faces latérales, c'est-à-dire ses faces orientées suivant la direction axiale autour de laquelle il exerce son mouvement oscillant de basculement alternatif. More specifically, it is possible to provide a first game on one side, between the distribution latch 14 and the face 157 of the hinge axis 15 and a second game on the other side, between the distribution latch 14 and the axial locking wall 101. These games are illustrated in Figures 3 and 4 via the annotations "GAME". This arrangement is of interest inter alia to maintain the dispensing latch 14 in the yoke 10, articulated with respect to the valves 13 and the cam shaft January 1, with a lateral play on its two side faces, that is to say, its faces oriented in the axial direction around which it exerts its oscillating movement of alternating tilting.
Le jeu latéral entre le linguet 14 et ses arrêts axiaux tels que définis ici est nécessaire au montage et pour éviter les frottements mécaniques et la consommation d'énergie. Un tel jeu n'a pas réellement d'incidence sur la loi de distribution même si la présence de ce jeu permet de répartir sensiblement l'usure sur la queue de la soupape 13, puisque le léger déplacement du linguet 14 dans la limite de son jeu permet au point de contact de ne pas rester toujours identique. Selon une variante de réalisation non représentée, chaque axe d'articulation 15 peut assurer le montage d'un linguet de distribution 14 qui est monté angulairement libre autour de l'axe d'articulation 15. A cet effet, chaque axe d'articulation 15 peut notamment comprendre un unique arbre de pivotement 151 assurant le montage à liaison pivot glissant du linguet de distribution 14. Selon un mode de réalisation non limitatif quant à la liberté de conception de l'axe d'articulation 15, celui-ci est constitué par une pièce, notamment de type monobloc ou d'un seul tenant, indépendante de la culasse 10 et fixée sur une face d'appui 102 délimitée par la culasse 10. A cet effet, l'axe d'articulation 15 délimite, notamment dans sa partie inférieure, une face d'appui 152 venant en contact direct contre la face d'appui 102 de la culasse 10. Ce contact assure une liaison appui-plan pour l'axe d'articulation 15 par rapport à la culasse 10. En complément, l'agencement comprend des éléments de fixation de l'axe d'articulation 15 sur la culasse 10, qui peuvent comprendre d'une part au moins un pion de centrage 16 (et d'autre part au moins une vis de fixation 17 (immobilisant l'axe d'articulation 15 par rapport à la culasse 10 dans la position définie par la coopération mécanique entre chaque pion de centrage 16 et la culasse 10, chaque pion de centrage 16 et chaque vis de fixation 17 traversant des lumières traversantes 153, 154, 156 ménagées à travers l'axe d'articulation 15. The lateral play between the pawl 14 and its axial stops as defined here is necessary for mounting and to avoid mechanical friction and energy consumption. Such a game does not really affect the distribution law even if the presence of this game allows to substantially distribute the wear on the tail of the valve 13, since the slight displacement of the pawl 14 in the limit of its play allows the point of contact to not always remain the same. According to an alternative embodiment not shown, each hinge pin 15 can ensure the mounting of a distribution latch 14 which is mounted angularly free around the axis of articulation 15. For this purpose, each hinge axis 15 may include in particular a single pivot shaft 151 ensuring the sliding pivot connection assembly of the distribution latch 14. According to a non-limiting embodiment as to the freedom of design of the hinge pin 15, the latter is constituted by a part, in particular of monobloc or integral type, independent of the yoke 10 and fixed on a bearing surface 102 delimited by the cylinder head 10. For this purpose, the hinge pin 15 delimits, in particular in its lower part, a bearing face 152 coming into direct contact against the bearing surface 102 of the 10. This contact provides a plane-support connection for the hinge pin 15 with respect to the yoke 10. In addition, the arrangement comprises fastening elements of the hinge pin 15 on the yoke 10. which can comprise on the one hand at least one centering pin 16 (and secondly at least one fixing screw 17 (immobilizing the axis of articulation 15 with respect to the cylinder head 10 in the position defined by the mechanical cooperation between each centering pin 16 and the cylinder head 10, each centering pin 16 and each fixing screw 17 passing through through-holes 153, 154, 156 formed through the hinge axis 15.
Dans le mode de réalisation illustré sur la figure 4, les éléments de fixation de l'axe d'articulation 15 sur la culasse 10 comprennent deux pions de centrage 16, comme cela est rendu visible sur la figure 4, permettant d'obtenir une précision dans le positionnement de l'axe d'articulation 15 sur la culasse 10. La lumière 153 destinée à être traversée par un pion de centrage 16 et la lumière 156 destinée à être traversée par la vis de fixation 17 peuvent être de section circulaire. Par contre, la lumière 154 destinée à être traversée par l'autre pion de centrage 16 peut présenter une section de forme oblongue, dont la longueur est orientée selon la direction de pivotement des linguets 14. Préférentiellement, l'axe d'articulation 15 est parallèle à l'arbre à came 1 1 . Le réglage du parallélisme est possible via les éléments de fixation ou tout autre organe dédié. Selon un mode de réalisation particulier, du côté opposé à sa zone de liaison à l'axe de pivotement 15, chaque linguet de distribution 14 comprend une zone en contact mécanique avec la came 1 1 1 et sollicitant mécaniquement une queue d'une soupape 13 destinée à être actionnée dans son mouvement de translation par le mouvement oscillant du linguet de distribution 14. Sur la queue de la soupape 13, l'agencement peut comprendre également une pastille de réglage 18 interposée entre la soupape 13 et le linguet de distribution 14. In the embodiment illustrated in FIG. 4, the fastening elements of the hinge pin 15 on the yoke 10 comprise two centering pins 16, as made visible in FIG. 4, making it possible to obtain a precision in the positioning of the hinge pin 15 on the cylinder head 10. The light 153 to be traversed by a centering pin 16 and the slot 156 to be traversed by the fastening screw 17 may be of circular section. By against the light 154 to be traversed by the other centering pin 16 may have a section of oblong shape, whose length is oriented in the direction of pivoting latches 14. Preferably, the hinge pin 15 is parallel to the cam shaft 11. Adjustment of the parallelism is possible via the fixing elements or any other dedicated organ. According to a particular embodiment, on the opposite side to its zone of connection to the pivot axis 15, each distribution latch 14 comprises a zone in mechanical contact with the cam 1 1 1 and mechanically biasing a tail of a valve 13 intended to be actuated in its translational movement by the oscillating movement of the dispensing latch 14. On the tail of the valve 13, the arrangement may also comprise a setting pad 18 interposed between the valve 13 and the distribution latch 14.
Contrairement aux culbuteurs 4 de l'art antérieur pour lesquels les appuis respectivement contre l'arbre à came 3 et contre la soupape 1 sont disposés de part et d'autre de l'axe d'articulation 5 du culbuteur 4, la solution décrite ici permet, pour chaque linguet de distribution 14, que les appuis mécaniques respectivement contre l'arbre à came 1 1 et contre la soupape 13 se pratique dans une seule et même zone, notamment agencée à une extrémité du linguet 14 opposée à l'extrémité au niveau de laquelle il est articulé autour de l'axe d'articulation 15. Il en résulte une simplification et un gain de place très importants. Unlike the rockers 4 of the prior art for which the supports respectively against the cam shaft 3 and against the valve 1 are arranged on either side of the hinge axis 5 of the rocker arm 4, the solution described here allows, for each distribution latch 14, the mechanical supports respectively against the cam shaft 1 1 and against the valve 13 is practiced in a single zone, in particular arranged at one end of the pawl 14 opposite the end to which level is articulated around the axis of articulation 15. This results in a very important simplification and space saving.
Dans un mode de réalisation non limitatif, l'axe d'articulation 15, les pions de centrage 16 et les linguets de distribution 14 seront préférentiellement réalisés en acier. L'axe d'articulation 15 pourra être traité thermiquement pour réduire son phénomène d'usure au niveau des arbres 151 et éventuellement revêtu par un revêtement ou un dépôt, notamment un matériau carboné obtenu sous forme de couche mince, par exemple de type « DLC » (pour « Diamond Like Carbon » en terminologie anglo- saxonne). Le montage de l'agencement détaillé précédemment peut se pratiquer de la manière suivante. L'axe d'articulation 15 sera préférentiellement configuré de telle sorte qu'il maintienne conjointement au moins un linguet de distribution, ici les deux linguets de distribution 14, avant d'être fixé sur la culasse 10 par vissage via la vis de fixation 17. L'axe d'articulation 15 sera positionné le plus parallèlement possible à l'arbre à came 1 1 , via au moins un pion de centrage 16 prévu à cet effet. In a non-limiting embodiment, the hinge axis 15, the centering pins 16 and the distribution latches 14 will preferably be made of steel. The hinge pin 15 may be heat-treated to reduce its wear phenomenon at the level of the shafts 151 and possibly coated with a coating or a deposit, in particular a carbonaceous material obtained in the form of a thin layer, for example of the "DLC" type. (For "Diamond Like Carbon" in English terminology). The assembly of the previously detailed arrangement can be carried out as follows. The hinge axis 15 will preferably be configured so that it jointly maintains at least one distribution latch, here the two distribution latches 14, before being fixed on the yoke 10 by screwing via the fastening screw 17 The hinge axis 15 will be positioned as parallel as possible to the cam shaft 11, via at least one centering pin 16 provided for this purpose.
Après avoir installé les soupapes 13 dans la culasse 10, les linguets 14 seront montés sur l'axe d'articulation 15 par les arbres 151 . Puis, l'ensemble sera placé sur la face 102 de la culasse 10, où les deux pions de centrage 16 et la vis de fixation 17 assureront le blocage de l'axe d'articulation 15 par rapport à la culasse 10. After installing the valves 13 in the cylinder head 10, the latches 14 will be mounted on the hinge pin 15 by the shafts 151. Then, the assembly will be placed on the face 102 of the yoke 10, where the two centering pins 16 and the fixing screw 17 will lock the hinge pin 15 relative to the yoke 10.
Les linguets de distribution 14 s'articuleront autour des arbres 151 respectifs et chacun sera bloqué axialement en translation, sur son arbre 151 , par la paroi 101 de la culasse 10 d'une part et par un élément idoine de l'axe d'articulation 15 lui-même, évitant tout recours à toute autre pièce externe à cet agencement tel que défini ici. The distribution latches 14 will articulate around the respective shafts 151 and each will be locked axially in translation, on its shaft 151, by the wall 101 of the yoke 10 on the one hand and by an appropriate element of the hinge pin 15 itself, avoiding any recourse to any other external part to this arrangement as defined herein.
La solution précédente permet avantageusement de maintenir deux linguets de distribution 14 avec une seule pièce constitutive de l'axe d'articulation 15 et une seule vis 17. Il en résulte une économie très avantageuse de pièces, permettant un gain de place, de poids, de coût de fabrication et de montage. La solution qui vient d'être décrite présente l'avantage également d'être à la fois simple de conception et de mise en œuvre, peu onéreuse, fiable, et facile à intégrer dans des situations d'encombrement réduit au niveau de la culasse. The preceding solution advantageously makes it possible to maintain two distribution latches 14 with a single component part of the hinge pin 15 and a single screw 17. This results in a very advantageous saving of parts, allowing a saving of space, weight, cost of manufacture and assembly. The solution just described has the advantage of being both simple design and implementation, inexpensive, reliable, and easy to integrate in situations of reduced size at the breech.

Claims

REVENDICATIONS
1 . Agencement pour véhicule automobile, comprenant une culasse (10) d'un moteur thermique, un arbre à came (1 1 ) en rotation par rapport à la culasse (10), au moins un axe d'articulation (15) fixé sur la culasse (10) et décalé par rapport à l'axe de rotation de l'arbre à came (1 1 ), et au moins un linguet de distribution (14) destiné à la commande des soupapes (13) d'admission et d'échappement du moteur thermique, monté sur l'axe d'articulation (15) et actionné selon un mouvement oscillant de basculement autour de l'axe d'articulation (15) par une came rotative (1 1 1 ) de l'arbre à came (1 1 ), dans lequel les arrêts axiaux du linguet de distribution (14) le long de l'axe d'articulation (15) sont constitués par une paroi de blocage axial (101 ) délimitée par la culasse (10) d'une part et par l'axe d'articulation (15) d'autre part. 1. Arrangement for a motor vehicle, comprising a cylinder head (10) of a heat engine, a camshaft (1 1) rotating relative to the cylinder head (10), at least one hinge pin (15) fixed on the cylinder head (10) and offset relative to the axis of rotation of the camshaft (1 1), and at least one distribution latch (14) for controlling the intake and exhaust valves (13) of the heat engine, mounted on the hinge axis (15) and actuated in an oscillating tilt movement about the hinge axis (15) by a rotary cam (1 1 1) of the camshaft ( 1 1), wherein the axial stops of the distribution latch (14) along the hinge axis (15) consist of an axial locking wall (101) delimited by the yoke (10) on the one hand and by the hinge pin (15) on the other hand.
2. Agencement selon la revendication 1 , caractérisé en ce que du côté opposé à ladite paroi de blocage axial (101 ) par rapport au linguet de distribution (14), l'axe d'articulation (15) forme un épaulement délimitant une face de blocage axial (157), ladite face de blocage axial (157) et ladite paroi de blocage (101 ) formant des arrêts axiaux dans des sens opposés pour le linguet de distribution (14). 2. Arrangement according to claim 1, characterized in that the side opposite to said axial locking wall (101) relative to the distribution latch (14), the hinge pin (15) forms a shoulder defining a face of axial locking (157), said axial locking face (157) and said locking wall (101) forming opposite axial stops for the distribution latch (14).
3. Agencement selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que chaque axe d'articulation (15) assure le montage de deux linguets de distribution (14) angulairement libres l'un par rapport à l'autre autour de l'axe d'articulation (15). 3. Arrangement according to any one of claims 1 or 2, characterized in that each axis of articulation (15) ensures the mounting of two distribution tongues (14) angularly free relative to each other around the hinge axis (15).
4. Agencement selon l'une quelconque des revendications 1 à 3, caractérisé en ce que chaque axe d'articulation (15) comprend deux arbres de pivotement (151 ) alignés entre eux et assurant chacun le montage à liaison pivot glissant d'un linguet de distribution (14) correspondant. 4. Arrangement according to any one of claims 1 to 3, characterized in that each axis of articulation (15) comprises two pivoting shafts (151) aligned with each other and each ensuring the sliding pivot connection mounting of a corresponding distribution latch (14).
5. Agencement selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'un jeu axial est présent entre le linguet de distribution (14) et l'axe d'articulation de bras oscillant (15) d'une part, et la paroi de blocage axial (101 ) d'autre part, compris entre 0,05 mm et 0,2 mm. 5. Arrangement according to any one of claims 1 to 4, characterized in that an axial play is present between the distribution latch (14) and the swingarm articulation axis (15) on the one hand, and the axial locking wall (101), on the other hand, between 0.05 mm and 0.2 mm.
6. Agencement selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'axe d'articulation (15) est constitué par une pièce, notamment de type monobloc ou d'un seul tenant, indépendante de la culasse (10) et fixée sur une face d'appui (102) délimitée par la culasse (10). 6. Arrangement according to any one of claims 1 to 5, characterized in that the hinge axis (15) is constituted by a part, in particular monobloc type or in one piece, independent of the cylinder head (10). ) and fixed on a bearing face (102) delimited by the yoke (10).
7. Agencement selon la revendication 6, caractérisé en ce que les éléments de fixation de l'axe d'articulation (15) sur la culasse (10) comprennent d'une part au moins un pion de centrage (16) et d'autre part au moins une vis de fixation (17) immobilisant l'axe d'articulation de bras oscillant (15) par rapport à la culasse (10) dans la position définie par la coopération mécanique entre chaque pion de centrage (16) et la culasse (10), chaque pion de centrage (16) et chaque vis de fixation (17) traversant des lumières traversantes (153, 154, 156) ménagées à travers l'axe d'articulation de bras oscillant (15). 7. Arrangement according to claim 6, characterized in that the fastening elements of the hinge pin (15) on the yoke (10) comprise firstly at least one centering pin (16) and other at least one fixing screw (17) immobilizing the swingarm articulation pin (15) with respect to the cylinder head (10) in the position defined by the mechanical cooperation between each centering pin (16) and the bolt (10), each centering peg (16) and each fixing screw (17) passing through through-holes (153, 154, 156) formed through the swingarm hinge axis (15).
8. Agencement selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'axe d'articulation (15) est parallèle à l'arbre à came (1 1 ). 8. Arrangement according to any one of claims 1 to 7, characterized in that the hinge pin (15) is parallel to the cam shaft (1 1).
9. Agencement selon l'une quelconque des revendications 1 à 8, caractérisé en ce que du côté opposé à sa zone de liaison à l'axe de pivotement (15), chaque linguet de distribution (14) comprend une zone en contact mécanique avec la came (1 1 1 ) et sollicitant mécaniquement une queue d'une soupape (13) destinée à être actionnée dans son mouvement de translation par le mouvement oscillant du linguet de distribution (14). 9. Arrangement according to any one of claims 1 to 8, characterized in that on the opposite side to its connection zone to the pivot axis (15), each distribution latch (14) comprises a zone in mechanical contact with the cam (1 1 1) and mechanically biasing a tail of a valve (13) intended to be actuated in its translation movement by the oscillating movement of the distribution latch (14).
10. Agencement selon la revendication 9, caractérisé en ce que sur la queue de la soupape (13), l'agencement comprend une pastille de réglage (18) interposée entre la soupape (13) et le linguet de distribution (14). 10. Arrangement according to claim 9, characterized in that on the tail of the valve (13), the arrangement comprises a setting pad (18) interposed between the valve (13) and the distribution latch (14).
1 1 . Véhicule automobile comprenant au moins un agencement selon l'une quelconque des revendications précédentes. 1 1. Motor vehicle comprising at least one arrangement according to any one of the preceding claims.
EP15817986.1A 2014-12-29 2015-12-10 Rocker arm with abutment against axial movement through a stop by the rocker arm shaft and by the cylinder head Active EP3240946B1 (en)

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FR1463377A FR3031137B1 (en) 2014-12-29 2014-12-29 DISTRIBUTION LINGUETS AXIALLY ADJUSTED BY AXIS JOINT AND CYLINDER HEAD
PCT/FR2015/053408 WO2016108002A1 (en) 2014-12-29 2015-12-10 Timing finger followers stopped axially by the pivot and by the cylinder head

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WO2016108002A1 (en) 2016-07-07
FR3031138A1 (en) 2016-07-01
CN107208501B (en) 2020-10-13
JP2018500503A (en) 2018-01-11
KR102294090B1 (en) 2021-08-26
CN107208501A (en) 2017-09-26
RU2017127159A3 (en) 2019-07-17
RU2698558C2 (en) 2019-08-28
EP3240946B1 (en) 2020-02-05
JP2018534461A (en) 2018-11-22
RU2017127159A (en) 2019-01-31
CN108350766B (en) 2021-02-09
KR20180063231A (en) 2018-06-11
CN108350766A (en) 2018-07-31
FR3031138B1 (en) 2019-06-21
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EP3356655A1 (en) 2018-08-08
EP3356655B1 (en) 2021-08-04

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