FR3121718A1 - Connecting rod between components of a motor vehicle, and associated manufacturing method. - Google Patents

Connecting rod between components of a motor vehicle, and associated manufacturing method. Download PDF

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Publication number
FR3121718A1
FR3121718A1 FR2103709A FR2103709A FR3121718A1 FR 3121718 A1 FR3121718 A1 FR 3121718A1 FR 2103709 A FR2103709 A FR 2103709A FR 2103709 A FR2103709 A FR 2103709A FR 3121718 A1 FR3121718 A1 FR 3121718A1
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FR
France
Prior art keywords
connecting rod
eyelet
main
parts
eyelets
Prior art date
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Granted
Application number
FR2103709A
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French (fr)
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FR3121718B1 (en
Inventor
Thomas JACOPIN
Franck KERGUELEN
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ContiTech Vibration Control GmbH
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ContiTech Vibration Control GmbH
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Publication date
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Priority to FR2103709A priority Critical patent/FR3121718B1/en
Priority to PCT/EP2022/059072 priority patent/WO2022218769A1/en
Publication of FR3121718A1 publication Critical patent/FR3121718A1/en
Application granted granted Critical
Publication of FR3121718B1 publication Critical patent/FR3121718B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/026—Constructions of connecting-rods with constant length made of fibre reinforced resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14467—Joining articles or parts of a single article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • B60G7/001—Suspension arms, e.g. constructional features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C2045/14442—Coating a portion of the article, e.g. the edge of the article injecting a grill or grid on the insert
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/06—Rods, e.g. connecting rods, rails, stakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/014—Constructional features of suspension elements, e.g. arms, dampers, springs with reinforcing nerves or branches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/016—Constructional features of suspension elements, e.g. arms, dampers, springs allowing controlled deformation during collision
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/10—Constructional features of arms
    • B60G2206/11—Constructional features of arms the arm being a radius or track or torque or steering rod or stabiliser end link
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/70—Materials used in suspensions
    • B60G2206/71—Light weight materials
    • B60G2206/7104—Thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/70—Materials used in suspensions
    • B60G2206/72—Steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/02—Shaping by casting
    • F16C2220/04—Shaping by casting by injection-moulding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une bielle comportant, à chacune de ses deux extrémités, une partie de liaison destinée à coopérer avec un organe extérieur, l’une de ces parties de liaison étant conformée en étrier (14) et l’autre de ces parties de liaison comprenant un œillet principal (1), ledit étrier (14) comportant deux œillets secondaires (3a, 3b) reliés chacun audit œillet principal (1) par un ensemble de bande de renfort (5) comprenant deux parties continues (5a, 5b) formant boucles autour dudit œillet principal (1) et respectivement autour de chacun desdits œillets secondaires (3a, 3b), lesdits œillets principal (1) et secondaires (3a, 3b) et ledit ensemble de bande (5) étant surmoulés au moins partiellement par une matière thermoplastique définissant notamment deux branches d’étrier (14a, 14b) comportant chacune l’un desdits œillets secondaires (3a, 3b). (Fig. 3)The invention relates to a connecting rod comprising, at each of its two ends, a connecting part intended to cooperate with an external member, one of these connecting parts being shaped like a stirrup (14) and the other of these parts connection comprising a main eyelet (1), said stirrup (14) comprising two secondary eyelets (3a, 3b) each connected to said main eyelet (1) by a set of reinforcing strips (5) comprising two continuous parts (5a, 5b) forming loops around said main eyelet (1) and respectively around each of said secondary eyelets (3a, 3b), said main (1) and secondary (3a, 3b) eyelets and said band assembly (5) being molded at least partially by a thermoplastic material defining in particular two stirrup branches (14a, 14b) each comprising one of said secondary eyelets (3a, 3b). (Fig.3)

Description

Bielle de liaison entre des organes d’un véhicule automobile, et procédé de fabrication associé.Connecting rod between components of a motor vehicle, and associated manufacturing method.

Domaine de l’inventionField of invention

La présente invention se rapporte au domaine de la mécanique, et plus précisément à celui des composants intervenant dans la structure d’un véhicule automobile.The present invention relates to the field of mechanics, and more specifically to that of the components involved in the structure of a motor vehicle.

Domaine technique de l’inventionTechnical field of the invention

Dans un véhicule automobile, certains organes doivent pouvoir se mouvoir relativement les uns aux autres, selon des trajectoires prédéterminées, tout en demeurant fermement reliés les uns aux autres.In a motor vehicle, certain components must be able to move relative to each other, according to predetermined trajectories, while remaining firmly connected to each other.

A cette fin, des bielles sont prévues : les extrémités de ces bielles sont montées rotatives sur chacun des organes susceptibles de se mouvoir l’un par rapport à l’autre selon une trajectoire prédéfinie.To this end, connecting rods are provided: the ends of these connecting rods are rotatably mounted on each of the members capable of moving relative to each other according to a predefined trajectory.

Un exemple d’une telle bielle est une bielle de reprise de couple du moteur d’un véhicule automobile, interposée entre ce moteur et le châssis du véhicule.An example of such a connecting rod is a torque pick-up connecting rod of the engine of a motor vehicle, interposed between this engine and the chassis of the vehicle.

Un autre exemple d’une telle bielle est une bielle de liaison entre le berceau et un support de roue d’un véhicule automobile.Another example of such a connecting rod is a connecting rod between the cradle and a wheel support of a motor vehicle.

Etat de la techniqueState of the art

Dans certaines applications, il est souhaitable de pouvoir utiliser une bielle comportant à l’une de ses extrémités un œillet de liaison, et à son autre extrémité, un étrier de liaison.In certain applications, it is desirable to be able to use a connecting rod comprising at one of its ends a connecting eyelet, and at its other end, a connecting bracket.

C’est le cas par exemple pour une bielle de liaison berceau/support de roue, dont l’œillet coopère avec le berceau, et l’étrier avec le support de roue.This is the case, for example, for a cradle/wheel carrier connecting rod, the eyelet of which cooperates with the cradle, and the caliper with the wheel carrier.

Classiquement, ces bielles de la technique antérieure sont formées en métal ou en alliage métallique, par exemple en aluminium extrudé, ou en acier moulé.Conventionally, these connecting rods of the prior art are formed from metal or a metal alloy, for example extruded aluminum, or cast steel.

L’inconvénient principal associé à ces matériaux est leur poids : ils n’offrent ainsi pas de réponse satisfaisante lorsque le constructeur de véhicules automobiles impose de fortes contraintes notamment sur le poids des éléments constitutifs de la structure du véhicule.The main drawback associated with these materials is their weight: they thus do not offer a satisfactory response when the motor vehicle manufacturer imposes strong constraints, in particular on the weight of the constituent elements of the vehicle structure.

On trouve aussi dans la technique antérieure des bielles en matériaux thermoplastiques, du type à œillets aux deux extrémités, plus légères mais moins résistantes mécaniquement.Also found in the prior art are connecting rods made of thermoplastic materials, of the type with eyelets at both ends, which are lighter but less mechanically resistant.

Problème technique restant poséTechnical problem remaining

La présente invention a ainsi notamment pour objectif de fournir une bielle pour structure de véhicule automobile, du type à œillet et à étrier de liaison, plus légère que celle de la technique antérieure, et présentant une résistance mécanique au moins égale.The object of the present invention is thus in particular to provide a connecting rod for a motor vehicle structure, of the eyelet and connecting bracket type, lighter than that of the prior art, and having at least equal mechanical strength.

On atteint ce but de l’invention avec une bielle comportant, à chacune de ses deux extrémités, une partie de liaison destinée à coopérer avec un organe extérieur, l’une de ces parties de liaison étant conformée en étrier et l’autre de ces parties de liaison comprenant un œillet principal, ledit étrier comportant deux œillets secondaires reliés chacun audit œillet principal par un ensemble de bande de renfort comprenant deux parties continues formant boucles autour dudit œillet principal et respectivement autour de chacun desdits œillets secondaires, lesdits œillets principal et secondaires et ledit ensemble de bande étant surmoulés au moins partiellement par une matière thermoplastique définissant notamment deux branches d’étrier comportant chacune l’un desdits œillets secondaires.This object of the invention is achieved with a connecting rod comprising, at each of its two ends, a connecting part intended to cooperate with an external member, one of these connecting parts being shaped like a stirrup and the other of these connecting parts comprising a main eyelet, said stirrup comprising two secondary eyelets each connected to said main eyelet by a set of reinforcement band comprising two continuous parts forming loops around said main eyelet and respectively around each of said secondary eyelets, said main and secondary eyelets and said band assembly being molded at least partially by a thermoplastic material defining in particular two stirrup branches each comprising one of said secondary eyelets.

Avec ces caractéristiques, on obtient une bielle qui est non seulement résistante, grâce à la présence de l’ensemble de bande de renfort comprenant deux parties continues, mais également légère, grâce à l’utilisation d’une matière thermoplastique qui vient se substituer au métal ou à l’alliage métallique de la technique antérieure.With these characteristics, a connecting rod is obtained which is not only resistant, thanks to the presence of the reinforcement strip assembly comprising two continuous parts, but also light, thanks to the use of a thermoplastic material which replaces the metal or metal alloy of the prior art.

La réalisation de l’étrier de la bielle au moyen de deux œillets secondaires entourés chacun par une partie respective de la bande, le tout surmoulé, permet d’obtenir un étrier parfaitement intégré à la bielle, ne nécessitant l’apport d’aucune pièce métallique en forme d’étrier : on peut de la sorte s’affranchir des problèmes d’interface qui peuvent survenir entre une telle pièce métallique et le reste de la bielle.The realization of the yoke of the connecting rod by means of two secondary eyelets each surrounded by a respective part of the band, the whole molded, makes it possible to obtain a stirrup perfectly integrated into the connecting rod, requiring the addition of no part metal in the form of a stirrup: in this way it is possible to overcome the interface problems which may arise between such a metal part and the rest of the connecting rod.

Suivant d’autres caractéristiques optionnelles de la bielle selon invention, prises seules ou en combinaison :According to other optional characteristics of the connecting rod according to the invention, taken alone or in combination:

- ledit œillet principal comporte un élément élastique au centre duquel est inséré un élément métallique de forme sensiblement tubulaire : cet élément élastique, qui peut être par exemple – mais non nécessairement – annulaire, permet de filtrer les vibrations transmises par la bielle, et l’insert métallique permet de relier par boulonnage cet élément élastique à la structure du véhicule automobile sans risque d’usure de cet élément ;- said main eyelet comprises an elastic element in the center of which is inserted a metal element of substantially tubular shape: this elastic element, which can be for example – but not necessarily – annular, makes it possible to filter the vibrations transmitted by the connecting rod, and the metal insert makes it possible to connect this elastic element by bolting to the structure of the motor vehicle without risk of wear of this element;

- lesdits œillets secondaires sont réalisés en alliage métallique ;- Said secondary eyelets are made of metal alloy;

- les deux parties dudit ensemble de bande de renfort sont distinctes ;- the two parts of said set of reinforcing strips are separate;

- les deux parties dudit ensemble de bande de renfort sont liées l’une à l’autre dans la zone dudit œillet principal ;- the two parts of said set of reinforcement strips are bonded to each other in the area of said main eyelet;

- ledit ensemble de bande de renfort comprend des fibres longues et continues telles que des fibres de verre ou de carbone, ou des fibres végétales telles que des fibres de lin ou d’orties par exemple, noyées dans une résine : un tel ensemble de bande de renfort, réalisé par exemple – mais de manière non limitative – avec une résine polyamide, présente l’avantage d’être très résistant aux efforts de traction, tout en étant suffisamment souple pour pouvoir être mis en œuvre aisément entre les œillets principal et secondaires lors du processus de fabrication de la bielle ;- said reinforcing strip assembly comprises long and continuous fibers such as glass or carbon fibers, or plant fibers such as flax or nettle fibers for example, embedded in a resin: such a strip assembly reinforcement, made for example - but not limited to - with a polyamide resin, has the advantage of being very resistant to tensile forces, while being flexible enough to be able to be easily implemented between the main and secondary eyelets during the connecting rod manufacturing process;

- lorsque les deux parties dudit ensemble de bande de renfort sont liées l’une à l’autre, lesdites fibres longues se croisent dans la zone dudit œillet principal ;- when the two parts of said set of reinforcing strips are bonded to each other, said long fibers intersect in the area of said main eyelet;

- ledit surmoulage thermoplastique est réalisé dans une résine identique ou chimiquement compatible avec celle de la résine enrobant les fibres dudit ensemble de bande de renfort : un tel surmoulage peut être réalisé aisément avec des outils d’injection classique, à faible coût ; il permet en outre de protéger l’ensemble de bande de renfort vis-à-vis des projections de graviers et autres particules lors des déplacements du véhicule automobile ; comme il est réalisé dans la même résine, ou dans une résine chimiquement compatible avec celle enrobant l’ensemble de bande de renfort, on obtient une excellente cohésion de ce surmoulage avec cet ensemble de bande de renfort ;- said thermoplastic overmolding is carried out in a resin identical or chemically compatible with that of the resin coating the fibers of said set of reinforcing strip: such overmolding can be easily carried out with conventional injection tools, at low cost; it also makes it possible to protect the assembly of reinforcement strip against the projection of gravel and other particles during movement of the motor vehicle; as it is made in the same resin, or in a resin chemically compatible with that coating the set of reinforcement strips, excellent cohesion of this overmolding with this set of reinforcement strips is obtained;

- ledit surmoulage présente des cavités et des nervures : ces nervures et ces cavités, placées sur les principaux chemins d’effort, permettent de faire une économie de matière surmoulée, et donc de réduire le poids et le coût de fabrication de la bielle ; de plus, des nervures disposées entre l’ensemble de bande de renfort et la périphérie de la bielle permettent de positionner cet ensemble de bande de renfort à l’écart des agressions mécaniques extérieures, comme des chocs de graviers ou autres particules lors du déplacement du véhicule.- Said overmolding has cavities and ribs: these ribs and these cavities, placed on the main paths of force, make it possible to save overmolded material, and therefore to reduce the weight and the manufacturing cost of the connecting rod; moreover, ribs arranged between the set of reinforcing strips and the periphery of the connecting rod make it possible to position this set of reinforcing strips away from external mechanical attacks, such as shocks from gravel or other particles during movement of the vehicle.

La présente invention se rapporte également à un procédé de fabrication d’une bielle conforme à ce qui précède, dans lequel on passe les deux parties dudit ensemble de bande de renfort autour dudit œillet principal et respectivement autour de chaque œillet secondaire, on place l’ensemble de ces pièces ainsi reliées à l’intérieur d’un moule à injection, et on injecte une matière de surmoulage à l’intérieur de ce moule.The present invention also relates to a method of manufacturing a connecting rod in accordance with the above, in which the two parts of said set of reinforcing strip are passed around said main eyelet and respectively around each secondary eyelet, the assembly of these parts thus connected inside an injection mold, and an overmolding material is injected inside this mold.

Ce faisant, la matière de surmoulage vient enrober les œillets principal et secondaires et l’ensemble de bande de renfort, permettant de solidariser ces pièces entre elles.In doing so, the overmolding material coats the main and secondary eyelets and the set of reinforcement strips, making it possible to secure these parts together.

Lorsque l’œillet principal comporte un élément élastique annulaire, la pression exercée par la matière de surmoulage lors de son injection à l’intérieur du moule permet de comprimer cet élément élastique annulaire vers son centre : ceci permet d’augmenter la durée de vie de cet élément élastique.When the main eyelet comprises an annular elastic element, the pressure exerted by the overmolding material during its injection inside the mold makes it possible to compress this annular elastic element towards its center: this makes it possible to increase the service life of this elastic element.

D’autres caractéristiques et avantages de l’invention ressortiront à la lecture de la description qui suit, en référence aux figures annexées, dans lesquelles :
: est une vue en perspective d’un œillet principal, de deux œillets secondaires et d’un ensemble de bande de renfort d’une bielle selon un mode de réalisation de l’invention dans lequel l’ensemble de bande comporte deux parties reliées entre elles, avant l’assemblage et le surmoulage de l’ensemble de ces pièces ;
: est une vue en perspective d’un œillet principal, de deux œillets secondaires et d’un ensemble de bande de renfort d’une bielle selon un mode de réalisation de l’invention dans lequel l’ensemble de bande comporte deux parties distinctes, après l’assemblage et avant le surmoulage de l’ensemble de ces pièces ;
: est une vue en perspective d’une bielle selon l’invention après surmoulage de l’œillet principal, des deux œillets secondaires et de l’ensemble de bande de renfort.Other characteristics and advantages of the invention will become apparent on reading the following description, with reference to the appended figures, in which:
: is a perspective view of a main eyelet, two secondary eyelets and a reinforcing band assembly of a connecting rod according to an embodiment of the invention in which the band assembly comprises two parts connected between they, before the assembly and overmolding of all of these parts;
: is a perspective view of a main eyelet, two secondary eyelets and a connecting rod reinforcing strip assembly according to one embodiment of the invention in which the strip assembly comprises two distinct parts, after assembly and before overmoulding of all of these parts;
: is a perspective view of a connecting rod according to the invention after overmoulding of the main eyelet, the two secondary eyelets and the reinforcing strip assembly.

Pour plus de clarté, les éléments identiques ou similaires sont repérés par des signes de référence identiques ou similaires sur l’ensemble des figures.For greater clarity, identical or similar elements are identified by identical or similar reference signs in all the figures.

Description détaillée de modes de réalisation de l’inventionDetailed description of embodiments of the invention

On se reporte à présent à la , sur laquelle on a représenté quatre pièces entrant dans la constitution d’une bielle selon la présente invention.We now refer to the , on which there are shown four parts forming part of a connecting rod according to the present invention.

Ces quatre pièces comprennent un œillet principal 1, deux œillets secondaires 3a, 3b et un ensemble de bande de renfort 5.These four pieces include a main eyelet 1, two secondary eyelets 3a, 3b and a set of reinforcement band 5.

L’œillet principal 1 comprend un élément 7 de préférence – mais de manière non limitative - annulaire formé dans un matériau élastique tel que du caoutchouc naturel ou synthétique, surmoulé avec adhérisation sur un élément sensiblement tubulaire 9, formé de préférence en métal.The main eyelet 1 comprises a preferably - but not limited to - annular element 7 formed in an elastic material such as natural or synthetic rubber, overmolded with bonding on a substantially tubular element 9, preferably formed in metal.

Les deux œillets secondaires 3a, 3b sont formés dans un alliage métallique, et présentent de préférence un diamètre moindre que celui de l’œillet principal 1.The two secondary eyelets 3a, 3b are formed from a metal alloy, and preferably have a smaller diameter than that of the main eyelet 1.

L’ensemble de bande de renfort 5 comporte deux parties 5a, 5b qui, dans une première variante représentée à la , sont reliées l’une à l’autre dans la zone 6 de l’œillet principal 1.The reinforcing strip assembly 5 comprises two parts 5a, 5b which, in a first variant shown in , are connected to each other in zone 6 of the main eyelet 1.

Dans une seconde variante représentée à la , les deux parties 5a, 5b de l’ensemble de bande 5 sont totalement indépendantes l’une de l’autre, y compris dans la zone de l’œillet principal 1.In a second variant shown in , the two parts 5a, 5b of the band assembly 5 are completely independent of each other, including in the area of the main eyelet 1.

La largeur de chaque partie de bande 5a, 5b peut par exemple – mais de manière non limitative - être de l’ordre de 10 mm, et l’épaisseur de l’ordre de 1 mm.The width of each band part 5a, 5b can for example - but not limited to - be of the order of 10 mm, and the thickness of the order of 1 mm.

Cet ensemble de bande 5 est formé en résine, telle que de la résine polyamide emprisonnant des fibres de renfort longues et continues, telles que des fibres de verre ou de carbone, ou des fibres végétales telles que fibres de lin ou d’orties par exemple, ces fibres étant disposées sensiblement selon la direction de la longueur de chaque partie 5a, 5b.This strip assembly 5 is formed from resin, such as polyamide resin, imprisoning long and continuous reinforcing fibers, such as glass or carbon fibers, or plant fibers such as flax or nettle fibers for example. , these fibers being arranged substantially along the direction of the length of each part 5a, 5b.

Dans la variante de la où les deux parties de bande 5a, 5b sont reliées entre elles dans la zone de l’œillet principal 1, les fibres de chaque partie de bande s’entrecroisent dans la zone de l’œillet principal 1, induisant donc une légère surépaisseur de l’ensemble de bande dans cette zone.In the variant of where the two band parts 5a, 5b are connected to each other in the area of the main eyelet 1, the fibers of each band part intersect in the area of the main eyelet 1, thus inducing a slight extra thickness of the band together in this area.

La résine polyamide est indiquée à titre d’exemple, mais il va de soi que d’autres résines utilisées dans le domaine des composites peuvent aussi convenir.The polyamide resin is given by way of example, but it goes without saying that other resins used in the field of composites can also be suitable.

Les deux parties 5a, 5b de l’ensemble de bande de renfort forment chacune une boucle continue entre l’œillet principal 1 et respectivement chacun des œillets secondaires 3a, 3b, c’est-à-dire qu’elles ne comportent pas d’interruption.The two parts 5a, 5b of the reinforcement band assembly each form a continuous loop between the main eyelet 1 and respectively each of the secondary eyelets 3a, 3b, that is to say that they do not comprise any interruption.

Sur la , on peut voir la bielle selon invention après l’opération de surmoulage par une matière thermoplastique identique ou chimiquement compatible avec la résine de l’ensemble de bande de renfort 5, telle que de la résine polyamide.On the , the connecting rod according to the invention can be seen after the overmolding operation with a thermoplastic material identical to or chemically compatible with the resin of the reinforcing strip assembly 5, such as polyamide resin.

Comme cela visible sur cette figure, cette matière thermoplastique 13 enrobe, l’œillet principal 1, les œillets secondaires 3a, 3b et l’ensemble de bande de renfort 5, définissant ainsi notamment un étrier 14 dont chacune des deux branches 14a, 14b inclut respectivement un œillet secondaire 3a, 3b.As can be seen in this figure, this thermoplastic material 13 coats the main eyelet 1, the secondary eyelets 3a, 3b and the set of reinforcing strip 5, thus defining in particular a stirrup 14 of which each of the two branches 14a, 14b includes respectively a secondary eyelet 3a, 3b.

La matière thermoplastique 13 ainsi surmoulée comporte des nervures 15 et des cavités 17, judicieusement placées par rapport aux chemins de contraintes tels qu’ils résultent des calculs de conception.The thermoplastic material 13 thus overmoulded comprises ribs 15 and cavities 17, judiciously placed with respect to the stress paths as they result from the design calculations.

Certaines de ces nervures maintiennent un espace entre l’ensemble de bande de renfort 5 et la périphérie de la bielle, de manière à protéger cette bande de renfort des agressions extérieures.Some of these ribs maintain a space between the reinforcing strip assembly 5 and the periphery of the connecting rod, so as to protect this reinforcing strip from external attack.

On notera en particulier qu’une nervure circulaire 19 entoure l’élément annulaire en caoutchouc 7, et que de la matière thermoplastique 13 vient entourer complètement les deux œillets secondaires 3a, 3b.It will be noted in particular that a circular rib 19 surrounds the annular rubber element 7, and that thermoplastic material 13 completely surrounds the two secondary eyelets 3a, 3b.

De préférence, la résine polyamide permettant d’obtenir le surmoulage est elle-même chargée de fibres de renfort, par exemple en verre ou en carbone, ou des fibres végétales telles que fibres de lin ou d’orties par exemple, disposées de préférence selon la direction de la longueur de la bielle.Preferably, the polyamide resin making it possible to obtain the overmolding is itself filled with reinforcing fibers, for example of glass or carbon, or plant fibers such as flax or nettle fibers for example, preferably arranged according to the length direction of the connecting rod.

Pour obtenir la bielle selon invention, on place l’œillet principal 1, les œillets secondaires 3a, 3b et l’ensemble de bande de renfort 5, mutuellement agencés conformément à la , à l’intérieur d’un moule à injection dont les deux demi-moules comportent des empreintes correspondant au négatif de la matière plastique surmoulée 13 visible à la .To obtain the connecting rod according to the invention, the main eyelet 1, the secondary eyelets 3a, 3b and the set of reinforcing strip 5 are placed, mutually arranged in accordance with , inside an injection mold, the two half-molds of which comprise imprints corresponding to the negative of the overmolded plastic material 13 visible at the .

Une fois les quatre pièces 1, 3a, 3b et 5 placées à l’intérieur de ce moule, on injecte la résine polyamide à l’intérieur de ce moule, de sorte que cette résine circule dans toutes les zones en creux définissant les nervures 15.Once the four parts 1, 3a, 3b and 5 have been placed inside this mould, the polyamide resin is injected inside this mould, so that this resin circulates in all the recessed zones defining the ribs 15 .

La pression de l’injection permet notamment d’exercer un effort de compression radiale sur l’élément annulaire en caoutchouc 7, contre l’élément métallique tubulaire 9.The injection pressure makes it possible in particular to exert a radial compression force on the annular rubber element 7, against the tubular metal element 9.

Cet élément 7 ayant au préalable été enduit sur sa périphérie d’une sous-couche spéciale, il devient complétement adhérisé à la nervure circulaire 19.This element 7 having previously been coated on its periphery with a special undercoat, it becomes completely bonded to the circular rib 19.

Le surmoulage ainsi obtenu permet notamment de protéger l’ensemble de bande de renfort 5 des projections de graviers ou autres particules, pouvant survenir lorsque le véhicule se déplace.The overmolding thus obtained makes it possible in particular to protect the assembly of reinforcement strip 5 from the projections of gravel or other particles, which may occur when the vehicle is moving.

Cet ensemble de bande ainsi surmoulé permet d’obtenir une excellente résistance de la bielle selon l’invention vis-à-vis des efforts de traction et de compression.This band assembly thus overmolded makes it possible to obtain excellent resistance of the connecting rod according to the invention with respect to tensile and compressive forces.

L’effort de compression radiale réalisé sur l’élément annulaire élastique 7 lors du surmoulage, permet de maintenir cet élément annulaire sous précontrainte, et ainsi d’éviter une usure prématurée du caoutchouc qui le constitue.The radial compressive force produced on the elastic annular element 7 during the overmoulding, makes it possible to maintain this annular element under prestress, and thus to avoid premature wear of the rubber which constitutes it.

Les deux œillets secondaires 3a, 3b disposés dans les deux branches 14a, 14b de l’étrier 14 sont typiquement destinés à coopérer avec un œillet de support de roue de véhicule automobile.The two secondary eyelets 3a, 3b arranged in the two branches 14a, 14b of the stirrup 14 are typically intended to cooperate with a motor vehicle wheel support eyelet.

L’élément tubulaire 9 de l’œillet principal 1 est typiquement destiné à coopérer avec un téton ou plus généralement avec une prise en chape solidaire d’un berceau d’essieu de véhicule automobile.The tubular element 9 of the main eyelet 1 is typically intended to cooperate with a stud or more generally with a yoke grip integral with a motor vehicle axle cradle.

Comme on peut le comprendre à la lumière de ce qui précède, la bielle selon invention et son procédé de fabrication associé, permettent d’obtenir une bielle résistante en matériaux très légers.As can be understood in the light of the foregoing, the connecting rod according to the invention and its associated manufacturing process, make it possible to obtain a resistant connecting rod made of very light materials.

Une telle bielle peut être utilisée pour les articulations des roues d’un véhicule automobile, mais également, moyennant les adaptations géométriques qui s’imposent, par exemple comme bras de reprise de couple, interposé entre le moteur d’un véhicule automobile et son châssis.Such a connecting rod can be used for the joints of the wheels of a motor vehicle, but also, subject to the necessary geometric adaptations, for example as a torque transmission arm, interposed between the engine of a motor vehicle and its chassis. .

Naturellement, l’invention est décrite dans ce qui précède à titre d’exemple. Il est entendu que l’homme du métier est à même de réaliser différentes variantes de réalisation de l’invention sans pour autant sortir du cadre de l’invention.Naturally, the invention is described in the foregoing by way of example. It is understood that the person skilled in the art is able to carry out different variant embodiments of the invention without departing from the scope of the invention.

Claims (10)

Bielle comportant, à chacune de ses deux extrémités, une partie de liaison destinée à coopérer avec un organe extérieur, l’une de ces parties de liaison étant conformée en étrier (14) et l’autre de ces parties de liaison comprenant un œillet principal (1), ledit étrier (14) comportant deux œillets secondaires (3a, 3b) reliés chacun audit œillet principal (1) par un ensemble de bande de renfort (5) comprenant deux parties continues (5a, 5b) formant boucles autour dudit œillet principal (1) et respectivement autour de chacun desdits œillets secondaires (3a, 3b), lesdits œillets principal (1) et secondaires (3a, 3b) et ledit ensemble de bande (5) étant surmoulés au moins partiellement par une matière thermoplastique définissant notamment deux branches d’étrier (14a, 14b) comportant chacune l’un desdits œillets secondaires (3a, 3b).Connecting rod comprising, at each of its two ends, a connecting part intended to cooperate with an external member, one of these connecting parts being shaped as a stirrup (14) and the other of these connecting parts comprising a main eyelet (1), said stirrup (14) comprising two secondary eyelets (3a, 3b) each connected to said main eyelet (1) by a set of reinforcing strips (5) comprising two continuous parts (5a, 5b) forming loops around said eyelet main (1) and respectively around each of said secondary eyelets (3a, 3b), said main (1) and secondary (3a, 3b) eyelets and said strip assembly (5) being molded at least partially by a thermoplastic material defining in particular two stirrup branches (14a, 14b) each comprising one of said secondary eyelets (3a, 3b). Bielle selon l’une quelconque des revendications précédentes, dans laquelle ledit œillet principal (1) comporte un élément élastique (7) au centre duquel est inséré un élément métallique (9) de forme sensiblement tubulaire.Connecting rod according to any one of the preceding claims, in which the said main eyelet (1) comprises an elastic element (7) in the center of which is inserted a metal element (9) of substantially tubular shape. Bielle selon l’une quelconque des revendications précédentes, dans laquelle lesdits œillets secondaires (3a, 3b) sont réalisés en alliage métallique.Connecting rod according to any one of the preceding claims, in which the said secondary eyelets (3a, 3b) are made of a metal alloy. Bielle selon l’une quelconque des revendications précédentes, dans laquelle les deux parties (5a, 5b) dudit ensemble de bande de renfort (5) sont distinctes.Connecting rod according to any one of the preceding claims, in which the two parts (5a, 5b) of said set of reinforcing strips (5) are separate. Bielle selon l’une quelconque des revendications 1 à 3, dans laquelle les deux parties (5a, 5b) dudit ensemble de bande de renfort (5) sont liées l’une à l’autre dans la zone dudit œillet principal (1).Connecting rod according to any one of Claims 1 to 3, in which the two parts (5a, 5b) of said reinforcement strip assembly (5) are bonded to each other in the area of said main eyelet (1). Bielle selon l’une quelconque des revendications précédentes, dans laquelle ledit ensemble de bande de renfort (5) comprend des fibres longues et continues telles que des fibres de verre ou de carbone, ou des fibres végétales telles que fibres de lin ou d’orties, noyées dans une résine.Connecting rod according to any one of the preceding claims, in which the said set of reinforcing strips (5) comprises long and continuous fibers such as glass or carbon fibers, or plant fibers such as flax or nettle fibers , embedded in a resin. Bielle selon les revendications 5 et 6, dans laquelle lesdites fibres longues se croisent dans la zone (6) dudit œillet principal (1).Connecting rod according to Claims 5 and 6, in which the said long fibers intersect in the zone (6) of the said main eyelet (1). Bielle selon la revendication 7, dans laquelle ledit surmoulage thermoplastique (13) est réalisé dans une résine identique ou chimiquement compatible avec celle de la résine enrobant les fibres dudit ensemble de bande de renfort (5).Connecting rod according to Claim 7, in which the said thermoplastic overmolding (13) is made of a resin identical to or chemically compatible with that of the resin coating the fibers of the said set of reinforcing strips (5). Bielle selon l’une quelconque des revendications précédentes, dans laquelle ledit surmoulage (13) présente des cavités (17) et des nervures (15).Connecting rod according to any one of the preceding claims, in which the said overmolding (13) has cavities (17) and ribs (15). Procédé de fabrication d’une bielle conforme à l’une quelconque des revendications précédentes, dans lequel on passe les deux parties (5a, 5b) dudit ensemble de bande de renfort (5) autour dudit œillet principal (1) et respectivement autour de chaque œillet secondaire (3a, 3b), on place l’ensemble de ces pièces ainsi reliées à l’intérieur d’un moule à injection, et on injecte une matière de surmoulage à l’intérieur de ce moule.Method of manufacturing a connecting rod according to any one of the preceding claims, in which the two parts (5a, 5b) of the said set of reinforcing strips (5) are passed around the said main eyelet (1) and respectively around each secondary eyelet (3a, 3b), all of these parts thus connected are placed inside an injection mold, and an overmoulding material is injected inside this mold.
FR2103709A 2021-04-12 2021-04-12 Connecting rod between components of a motor vehicle, and associated manufacturing method. Active FR3121718B1 (en)

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FR2103709A FR3121718B1 (en) 2021-04-12 2021-04-12 Connecting rod between components of a motor vehicle, and associated manufacturing method.
PCT/EP2022/059072 WO2022218769A1 (en) 2021-04-12 2022-04-06 Link rod for connecting members of a motor vehicle, and associated manufacturing method

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FR2103709A FR3121718B1 (en) 2021-04-12 2021-04-12 Connecting rod between components of a motor vehicle, and associated manufacturing method.

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994006127A1 (en) * 1992-09-02 1994-03-17 Mac Lean-Fogg Company Insulator structure and method of construction
FR2953443A1 (en) * 2009-12-08 2011-06-10 Messier Dowty Sa METHOD FOR MANUFACTURING A ROD IN A COMPOSITE MATERIAL COMPRISING A LOCALIZED SOURCIFIER
US20150292550A1 (en) * 2014-04-15 2015-10-15 Toyota Tsusho America, Inc. Composite automotive connecting rod and method of manufacture
DE102018208298A1 (en) * 2018-05-25 2019-11-28 Zf Friedrichshafen Ag Coupling rod, suspension and method for producing a coupling rod

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994006127A1 (en) * 1992-09-02 1994-03-17 Mac Lean-Fogg Company Insulator structure and method of construction
FR2953443A1 (en) * 2009-12-08 2011-06-10 Messier Dowty Sa METHOD FOR MANUFACTURING A ROD IN A COMPOSITE MATERIAL COMPRISING A LOCALIZED SOURCIFIER
US20150292550A1 (en) * 2014-04-15 2015-10-15 Toyota Tsusho America, Inc. Composite automotive connecting rod and method of manufacture
DE102018208298A1 (en) * 2018-05-25 2019-11-28 Zf Friedrichshafen Ag Coupling rod, suspension and method for producing a coupling rod

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