WO2000040393A1 - Method and device for making a mechanical assembly comprising at least two mechanical parts assembled by a linking component made of mouldable material - Google Patents

Method and device for making a mechanical assembly comprising at least two mechanical parts assembled by a linking component made of mouldable material Download PDF

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Publication number
WO2000040393A1
WO2000040393A1 PCT/FR2000/000003 FR0000003W WO0040393A1 WO 2000040393 A1 WO2000040393 A1 WO 2000040393A1 FR 0000003 W FR0000003 W FR 0000003W WO 0040393 A1 WO0040393 A1 WO 0040393A1
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WO
WIPO (PCT)
Prior art keywords
mold
mechanical
parts
preform
mechanical parts
Prior art date
Application number
PCT/FR2000/000003
Other languages
French (fr)
Inventor
Eric Serge Fournier
Original Assignee
Siemens Automotive Moteurs Electriques S.A.
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Filing date
Publication date
Application filed by Siemens Automotive Moteurs Electriques S.A. filed Critical Siemens Automotive Moteurs Electriques S.A.
Priority to AU30503/00A priority Critical patent/AU3050300A/en
Publication of WO2000040393A1 publication Critical patent/WO2000040393A1/en

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Classifications

    • 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
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • B29C45/0062—Joined by injection moulding
    • 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
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • B29C2045/0065—Joining parts moulded in separate cavities the parts being interconnected before assembling by a breaking or shearing point

Definitions

  • the present invention relates to a method of manufacturing a mechanical assembly comprising at least two mechanical parts assembled by a mechanical connecting part made of a moldable material.
  • the present invention also relates to a device for implementing this method.
  • a mechanical assembly comprising first and second rigid mechanical parts 1,2, respectively, assembled by a connecting piece 3.
  • the piece 1 takes the form of an annular ring disposed at the inside of a hole 4 drilled in the part 2.
  • the connecting part 3 also takes the form of a ring enveloping the periphery of the ring 1 by filling in the hole 4 and projecting over the two faces of the part 2, substantially flat, so as to hang on it.
  • a member 6 subjected to vibrations, coming from an electric motor for example, is mounted on the ring 4 by means of a screw 5 passing through the ring 1.
  • the connecting part 3 is produced from an elastic material capable of imparting to this part the properties of a damper filtering said vibrations.
  • the ring 2 then plays the role of a spacer preventing the crushing of this elastic material by the screw 5.
  • a suitable material such as a thermoplastic elastomer
  • the parts 1 and 2 are installed in a mold comprising two parts 7.8 movable between an open position and a closed position (shown in FIG. 2) and the thermoplastic elastomeric material is injected in the fluid state into a cavity delimited by suitable surfaces of the two parts 7, 8 of the mold and arranged at the interface of parts 1 and 2, so as to form the damper 3 in this cavity.
  • the present invention therefore aims to provide a method of manufacturing a mechanical assembly of the type described above, designed so as to reduce the cost of manufacturing this assembly.
  • a method of manufacturing a mechanical assembly comprising at least two mechanical parts assembled by a connecting part produced in a moldable material, this process being remarkable in that a) a preform of the two mechanical parts is produced, in which these two parts are assembled by at least one frangible means, in a relative position away from their final assembly position, b ) a mold is opened in two parts suitable for producing said connecting part by overmolding of said mechanical parts and said preform is installed in said mold so that, during its subsequent closure, the mold breaks said frangible means and drives said mechanical parts into their final assembly position, and c) the mold is closed and said moldable material is injected into the mold to form said mechanical assembly.
  • the cost of implementing the method according to the invention is reduced by the fact that it requires the production and the stocking only of one piece, the preform, at place of the two parts 1 and 2, and that it simplifies at the same time the positioning of these parts in the mold.
  • the present invention also provides a device for implementing this method, remarkable in that it comprises a) means for producing said preform, b) a mold comprising at least two moving parts, one relative to the other between an open position and a closed position, this mold comprising bi) means for receiving said preform in a predetermined position, b 2 ) stop means arranged so as to come into engagement with said preform during closing of the mold to break said frangible means and place said mechanical parts in their final assembly position at the end of closing of the mold and b 3 ) means defining a molding cavity of said connecting part after closing of the mold and fixing of said mechanical parts in their final assembly position.
  • FIGS. 1 and 2 are diagrams illustrating the prior art described in the preamble to this description
  • Figures 3 to 5 are schematic sectional views showing an embodiment of the device according to the invention, suitable for the manufacture of an anti-vibration support assembly
  • Figures 6 and 7 are diagrams, in plan and in section respectively, of another set of anti-vibration support designed to be manufactured by the process according to the invention
  • FIGS. 8 to 11 schematically represent a device according to the invention suitable for manufacturing all of FIGS. 6 and 7.
  • FIGS. 3 to 5 of the appended drawing describe the process according to the invention, applied to the manufacture of a mechanical anti-vibration assembly in accordance with that shown in FIG. 1.
  • a part, or preform is produced comprising two parts assembled to one another by means such as a frangible connection 10, these two parts respectively taking the form of the parts 1 and 2 of the assembly of FIG. 1, as it appears in FIG. 3 which represents a sectional view of a mold 11,12 in which this preform (1,2,10) is manufactured.
  • This frangible connection can be constituted by one or more thin bridges made integrally with the parts 1 and 2 and connecting these between the outer periphery of the part 1 and the inner periphery of the hole 4.
  • FIGS. 4 and 5 of the appended drawing describe the rest of the manufacturing process according to the invention and explain the presence of the characteristic explained above of the preform (1,2,10) used in the present invention. .
  • This preform having been produced, it is introduced into a mold 7 ′, 8 ′ open for this purpose (see FIG. 4), and comprising a finger 13 whose end is shaped to pass through the ring 1, so as to constitute a means of receiving and centering the preform in the mold (7 ′, 8 ′).
  • the facing faces 14, 15 of the two parts 7 ′, 8 ′ of the mold are shaped so as to define a generally annular abutment surface 16 arranged to come into engagement with the ring 1, as illustrated in FIG. 4, during closing of the mold 7 ', 8' which follows the introduction of the preform (1,2,10).
  • the pressure then exerted by the abutment surface 16 on the ring 1 is transmitted to the frangible link 10 which breaks, thereby releasing the ring 1.
  • thermoplastic material having after curing a suitable elasticity such as a thermoplastic elastomer for example, the vibroacoustic isolation of the parts 1 and 2 is ensured. , for example by filtering vibrations generated by a motor and transmitted to a member 6 for fixing this motor (see FIG. 1) on the part 2 then constituting a support for this motor.
  • the present invention makes it possible to produce the mechanical assembly (1,2,3) starting from a one-piece preform (1,2,10) and not from two parts 1,2 not linked to one another. 'Other, this preform can itself be manufactured in a single injection molding operation. This reduces the number of parts to manufacture and put in stock, then to handle during the manufacture of the assembly (1,2,3) which advantageously reduces the cost price of manufacturing this assembly, in accordance with the aim pursued by the present invention.
  • FIGS. 6 to 11 of the appended drawing to describe another application of the method according to the invention.
  • the friction of the stick against a rapidly rotating body such as this rotor is likely to vibrate this stick.
  • the object of part 23 is to prevent the transmission of these vibrations to the plate 22.
  • a preform (21,22,20i) is first produced as shown in plan view in FIG. 8, in a mold 11 ′, 12 'shown schematically in section in Figure 9.
  • the parts 21 and 22 are joined in a single piece by frangible legs 20i (i from 1 to 4 in the embodiment shown).
  • the part or cage 21 is moved away, in the preform, from its final assembly position, as appears by comparing FIGS. 7 and 9.
  • the invention is not limited to the embodiments described and shown which have been given only by way of example.
  • the invention can find application to the suspension of any device or organ generating or transmitting vibrations, and not only to the suspension of an electric motor or of electric contact brush cages for such a motor.
  • the preform used in the invention could be produced other than by molding, for example by stamping, machining, etc.
  • the invention is not limited to the production of anti-vibration suspensions, comprising a connecting piece of an elastically deformable material.
  • the connecting piece can have a different function, for example a function of electrical or thermal insulation of the parts that it assembles and then be made of an electrically or thermally insulating material, respectively, for example.

Abstract

The invention concerns a method which consists in: a) producing a preform (1, 2, 10) of the two mechanical parts (1, 2), wherein the two parts are assembled by at least a frangible link (10), in a position relatively spaced from their final assembling position; b) opening a two-part (7', 8') mould for producing the linking component (3) by overmoulding the mechanical parts (1, 2) and setting said preform (1, 2, 10) in said mould such that, when it is subsequently closed, the mould breaks the frangible link (10) et drives the two mechanical parts into their final assembling position; and c) closing the mould (7', 8') and injecting the moulding material into the mould to form the mechanical assembly (1, 2, 3). The invention is applicable to an anti-vibration mechanical assembly.

Description

PROCEDE ET DISPOSITIF DE FABRICATION D'UN ENSEMBLE MECANIQUE COMPORTANT AU MOINS DEUX PIECES MECANIQUES ASSEMBLEES PAR UNE PIECE DE LIAISON REALISEE EN UN MATERIAU MOULABLEPROCESS AND DEVICE FOR MANUFACTURING A MECHANICAL ASSEMBLY COMPRISING AT LEAST TWO MECHANICAL PARTS ASSEMBLED BY A CONNECTING PART MADE OF A MOLDABLE MATERIAL
La présente invention est relative à un procédé de fabrication d'un ensemble mécanique comprenant au moins deux pièces mécaniques assemblées par une pièce mécanique de liaison réalisée en un matériau moulable. La présente invention est aussi relative à un dispositif pour la mise en oeuvre de ce procédé. On a représenté à la figure 1 du dessin annexé un ensemble mécanique comprenant des première et deuxième pièces mécaniques rigides 1,2, respectivement, assemblées par une pièce de liaison 3. La pièce 1 prend la forme d'une bague annulaire disposée à l'intérieur d'un trou 4 percé dans la pièce 2. La pièce de liaison 3 prend aussi la forme d'une bague enveloppant la périphérie de la bague 1 en comblant le trou 4 et en débordant sur les deux faces de la pièce 2, sensiblement planes, de manière à s'accrocher sur celle-ci. Un organe 6 soumis à des vibrations, venues d'un moteur électrique par exemple, est monté sur la bague 4 à l'aide d'une vis 5 traversant la bague 1.The present invention relates to a method of manufacturing a mechanical assembly comprising at least two mechanical parts assembled by a mechanical connecting part made of a moldable material. The present invention also relates to a device for implementing this method. There is shown in Figure 1 of the accompanying drawing a mechanical assembly comprising first and second rigid mechanical parts 1,2, respectively, assembled by a connecting piece 3. The piece 1 takes the form of an annular ring disposed at the inside of a hole 4 drilled in the part 2. The connecting part 3 also takes the form of a ring enveloping the periphery of the ring 1 by filling in the hole 4 and projecting over the two faces of the part 2, substantially flat, so as to hang on it. A member 6 subjected to vibrations, coming from an electric motor for example, is mounted on the ring 4 by means of a screw 5 passing through the ring 1.
Pour éviter que les vibrations du moteur ne se transmettent à la pièce 2, constituant un support du moteur par exemple, on réalise la pièce de liaison 3 en un matériau élastique propre à conférer à cette pièce les propriétés d'un amortisseur filtrant lesdites vibrations. La bague 2 joue alors le rôle d'une entretoise évitant l'écrasement de ce matériau élastique par la vis 5. On sait réaliser la pièce de liaison 3 par surmoulage des pièces 1 et 2 avec un matériau convenable, tel qu'un élastomère thermoplastique, comme illustré schématiquement à la figure 2. Pour ce faire, on installe les pièces 1 et 2 dans un moule comportant deux parties 7,8 mobiles entre une position d'ouverture et une position de fermeture (représentée à la figure 2) et on injecte le matériau élastomère thermoplastique à l'état fluide dans une cavité délimitée par des surfaces convenables des deux parties 7,8 du moule et disposées à l'interface des pièces 1 et 2, de manière à former l'amortisseur 3 dans cette cavité.To prevent the vibrations of the motor from being transmitted to the part 2, constituting a support for the motor for example, the connecting part 3 is produced from an elastic material capable of imparting to this part the properties of a damper filtering said vibrations. The ring 2 then plays the role of a spacer preventing the crushing of this elastic material by the screw 5. It is known to make the connecting piece 3 by overmolding of the pieces 1 and 2 with a suitable material, such as a thermoplastic elastomer , as illustrated diagrammatically in FIG. 2. To do this, the parts 1 and 2 are installed in a mold comprising two parts 7.8 movable between an open position and a closed position (shown in FIG. 2) and the thermoplastic elastomeric material is injected in the fluid state into a cavity delimited by suitable surfaces of the two parts 7, 8 of the mold and arranged at the interface of parts 1 and 2, so as to form the damper 3 in this cavity.
Le procédé de fabrication décrit ci-dessus présente des inconvénients. Il suppose en effet la fabrication et la mise en stock des deux pièces 1 et 2, puis leur installation dans le moule 7,8, installation qui exige des manipulations délicates, notamment pour placer précisément la bague 2 au centre du trou 4 percé dans la pièce 1. Toutes ces opérations grèvent évidemment le prix de revient des produits fabriqués selon ce procédé, ce qui est particulièrement dommageable pour des fabrications de fort volume à coût réduit, telles que la fabrication de groupes motoventilateurs pour véhicules automobiles, par exemple.The manufacturing process described above has drawbacks. It supposes in fact the manufacture and the stocking of the two parts 1 and 2, then their installation in the mold 7,8, installation which requires delicate manipulations, in particular to precisely place the ring 2 in the center of the hole 4 drilled in the Exhibit 1. All these operations obviously encumber the cost price of the products manufactured according to this process, which is particularly damaging for high volume manufacturing at reduced cost, such as the manufacture of fan units for motor vehicles, for example.
La présente invention a donc pour but de fournir un procédé de fabrication d'un ensemble mécanique du type décrit ci-dessus, conçu de manière à réduire le coût de fabrication de cet ensemble.The present invention therefore aims to provide a method of manufacturing a mechanical assembly of the type described above, designed so as to reduce the cost of manufacturing this assembly.
On atteint ce but de l'invention, ainsi que d'autres qui apparaîtront à la lecture de la description qui va suivre, avec un procédé de fabrication d'un ensemble mécanique comprenant au moins deux pièces mécaniques assemblées par une pièce de liaison réalisée en un matériau moulable, ce procédé étant remarquable en ce que a) on réalise une préforme des deux pièces mécaniques, dans laquelle ces deux pièces sont assemblées par au moins un moyen frangible, dans une position relative écartée de leur position finale d'assemblage, b) on ouvre un moule en deux parties propre à réaliser ladite pièce de liaison par surmoulage desdites pièces mécaniques et on installe ladite préforme dans ledit moule de manière que, lors de sa fermeture ultérieure, le moule brise ledit moyen frangible et entraîne lesdites pièces mécaniques dans leur position finale d'assemblage, et c) on ferme le moule et on injecte ledit matériau moulable dans le moule pour constituer ledit ensemble mécanique.This object of the invention is achieved, as well as others which will appear on reading the description which follows, with a method of manufacturing a mechanical assembly comprising at least two mechanical parts assembled by a connecting part produced in a moldable material, this process being remarkable in that a) a preform of the two mechanical parts is produced, in which these two parts are assembled by at least one frangible means, in a relative position away from their final assembly position, b ) a mold is opened in two parts suitable for producing said connecting part by overmolding of said mechanical parts and said preform is installed in said mold so that, during its subsequent closure, the mold breaks said frangible means and drives said mechanical parts into their final assembly position, and c) the mold is closed and said moldable material is injected into the mold to form said mechanical assembly.
Comme on le verra plus loin en détail, le coût de mise en oeuvre du procédé suivant l'invention est réduit par le fait qu'il n'exige la fabrication et la mise en stock que d'une seule pièce, la préforme, au lieu des deux pièces 1 et 2, et qu'il simplifie du même coup la mise en place de ces pièces dans le moule.As will be seen below in detail, the cost of implementing the method according to the invention is reduced by the fact that it requires the production and the stocking only of one piece, the preform, at place of the two parts 1 and 2, and that it simplifies at the same time the positioning of these parts in the mold.
La présente invention fournit aussi un dispositif pour la mise en oeuvre de ce procédé, remarquable en ce qu'il comprend a) des moyens de réalisation de ladite préforme, b) un moule comportant au moins deux parties mobiles l'une par rapport à l'autre entre une position d'ouverture et une position de fermeture, ce moule comportant bi) des moyens pour recevoir ladite préforme dans une position prédéterminée, b2) des moyens de butée disposés de manière à venir en prise avec ladite préforme pendant la fermeture du moule pour casser ledit moyen frangible et disposer lesdites pièces mécaniques dans leur position finale d'assemblage en fin de fermeture du moule et b3) des moyens définissant une cavité de moulage de ladite pièce de liaison après fermeture du moule et fixation desdites pièces mécaniques dans leur position finale d'assemblage.The present invention also provides a device for implementing this method, remarkable in that it comprises a) means for producing said preform, b) a mold comprising at least two moving parts, one relative to the other between an open position and a closed position, this mold comprising bi) means for receiving said preform in a predetermined position, b 2 ) stop means arranged so as to come into engagement with said preform during closing of the mold to break said frangible means and place said mechanical parts in their final assembly position at the end of closing of the mold and b 3 ) means defining a molding cavity of said connecting part after closing of the mold and fixing of said mechanical parts in their final assembly position.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre et à l'examen du dessin annexé dans lequel :Other characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawing in which:
- les figures 1 et 2 sont des schémas illustrant la technique antérieure décrite en préambule de la présente description, les figures 3 à 5 sont des vues en coupe schématiques représentant un mode de réalisation du dispositif suivant l'invention, adapté à la fabrication d'un ensemble de support anti-vibrations, - les figures 6 et 7 sont des schémas, en plan et en coupe respectivement, d'un autre ensemble de support anti-vibrations conçu pour être fabriqué par le procédé suivant l'invention, etFIGS. 1 and 2 are diagrams illustrating the prior art described in the preamble to this description, Figures 3 to 5 are schematic sectional views showing an embodiment of the device according to the invention, suitable for the manufacture of an anti-vibration support assembly, - Figures 6 and 7 are diagrams, in plan and in section respectively, of another set of anti-vibration support designed to be manufactured by the process according to the invention, and
- les figures 8 à 11 représentent schématiquement un dispositif suivant l'invention adapté à la fabrication de l'ensemble des figures 6 et 7.FIGS. 8 to 11 schematically represent a device according to the invention suitable for manufacturing all of FIGS. 6 and 7.
Dans les figures 3 à 11, des références numériques, éventuellement affectées d'un "prime" ou d'un "seconde", identiques à des références utilisées sur les figures 1 et 2, repèrent des éléments ou organes identiques ou similaires.In FIGS. 3 to 11, numerical references, possibly assigned a "prime" or a "second", identical to references used in FIGS. 1 and 2, identify identical or similar elements or members.
On se réfère aux figures 3 à 5 du dessin annexé pour décrire le procédé suivant l'invention, appliqué à la fabrication d'un ensemble mécanique anti-vibrations conforme à celui représenté à la figure 1.Reference is made to FIGS. 3 to 5 of the appended drawing to describe the process according to the invention, applied to the manufacture of a mechanical anti-vibration assembly in accordance with that shown in FIG. 1.
Dans une première étape du procédé suivant la présente invention, on réalise une pièce, ou préforme, comportant deux parties assemblées l'une à l'autre par un moyen tel qu'une liaison frangible 10, ces deux parties prenant respectivement la forme des pièces 1 et 2 de l'ensemble de la figure 1, comme cela apparaît à la figure 3 qui représente une vue en coupe d'un moule 11,12 dans lequel on fabrique cette préforme (1,2,10).In a first step of the method according to the present invention, a part, or preform, is produced comprising two parts assembled to one another by means such as a frangible connection 10, these two parts respectively taking the form of the parts 1 and 2 of the assembly of FIG. 1, as it appears in FIG. 3 which represents a sectional view of a mold 11,12 in which this preform (1,2,10) is manufactured.
Cette liaison frangible peut être constituée par un ou plusieurs ponts minces venus de matière avec les pièces 1 et 2 et reliant celles-ci entre la périphérie extérieure de la pièce 1 et la périphérie intérieure du trou 4.This frangible connection can be constituted by one or more thin bridges made integrally with the parts 1 and 2 and connecting these between the outer periphery of the part 1 and the inner periphery of the hole 4.
Comme cela apparaît à la figure 3, dans la préforme (1,2,10) la pièce 1 en forme de bague occupe une position, sur l'axe X du trou 4, qui est écartée de la position occupée par cette pièce dans la position finale d'assemblage des pièces 1 et 2 représentée à la figure 1, position dans laquelle les centres de la pièce 1 en forme de bague et du trou 4 sont confondus .As shown in Figure 3, in the preform (1,2,10) the part 1 in the form of a ring occupies a position, on the X axis of the hole 4, which is moved away from the position occupied by this part in the final assembly position of the parts 1 and 2 shown in FIG. 1, position in which the centers of the part 1 are shaped ring and hole 4 are combined.
On se réfère maintenant aux figures 4 et 5 du dessin annexé pour décrire la suite du procédé de fabrication suivant l'invention et expliquer la présence de la caractéristique explicitée ci-dessus de la préforme (1,2,10) utilisée dans la présente invention.Reference is now made to FIGS. 4 and 5 of the appended drawing to describe the rest of the manufacturing process according to the invention and explain the presence of the characteristic explained above of the preform (1,2,10) used in the present invention. .
Cette préforme ayant été réalisée, on introduit celle-ci dans un moule 7 ',8' ouvert à cet effet (voir figure 4), et comportant un doigt 13 dont l'extrémité est conformée pour passer dans la bague 1, de manière à constituer un moyen de réception et de centrage de la préforme dans le moule (7 ',8').This preform having been produced, it is introduced into a mold 7 ′, 8 ′ open for this purpose (see FIG. 4), and comprising a finger 13 whose end is shaped to pass through the ring 1, so as to constitute a means of receiving and centering the preform in the mold (7 ′, 8 ′).
Les faces en regard 14,15 des deux parties 7', 8' du moule sont conformées de manière à définir une surface de butée 16 généralement annulaire agencée pour venir en prise avec la bague 1, comme illustré à la figure 4, pendant une fermeture du moule 7 ',8' qui suit la mise en place de la préforme (1,2,10). La pression alors exercée par la surface de butée 16 sur la bague 1 est transmise à la liaison frangible 10 qui se brise en libérant alors la bague 1.The facing faces 14, 15 of the two parts 7 ′, 8 ′ of the mold are shaped so as to define a generally annular abutment surface 16 arranged to come into engagement with the ring 1, as illustrated in FIG. 4, during closing of the mold 7 ', 8' which follows the introduction of the preform (1,2,10). The pressure then exerted by the abutment surface 16 on the ring 1 is transmitted to the frangible link 10 which breaks, thereby releasing the ring 1.
La suite du mouvement de fermeture du moule fait glisser alors la bague 1 sur le doigt 13 jusqu'à ce que cette bague soit arrêtée par une paroi 17 (voir figure 5) d'une cavité 18 de moulage conformée pour recevoir une injection d'un matériau thermoplastique à l'état fluide propre à constituer, après durcissement, la pièce élastique de liaison 3 représentée à la figure 1. La paroi 17 est agencée pour définir avec précision la position finale d'assemblage des pièces 1 et 2. On sort finalement l'ensemble mécanique (1,2,3) tel que représenté à la figure 1, du moule 7 ',8', par actionnement du doigt 13 par exemple, agissant alors en éjecteur . En choisissant pour réaliser la pièce 3, ainsi obtenue par surmoulage des pièces 1 et 2, un matériau thermoplastique présentant après durcissement une élasticité convenable, tel qu'un élastomère thermoplastique par exemple, on assure l'isolement vibro- acoustique des pièces 1 et 2, en filtrant par exemple des vibrations engendrées par un moteur et transmises à un organe 6 de fixation de ce moteur (voir figure 1) sur la pièce 2 constituant alors un support pour ce moteur.Following the closing movement of the mold then slides the ring 1 on the finger 13 until this ring is stopped by a wall 17 (see FIG. 5) of a mold cavity 18 shaped to receive an injection of a thermoplastic material in the fluid state suitable for constituting, after hardening, the elastic connecting piece 3 shown in FIG. 1. The wall 17 is arranged to precisely define the final assembly position of the pieces 1 and 2. Finally, the mechanical assembly (1,2,3) as shown in FIG. 1 is taken out of the mold 7 ′, 8 ′, by actuation of the finger 13 for example, then acting as an ejector. By choosing to make the part 3, thus obtained by overmolding of the parts 1 and 2, a thermoplastic material having after curing a suitable elasticity, such as a thermoplastic elastomer for example, the vibroacoustic isolation of the parts 1 and 2 is ensured. , for example by filtering vibrations generated by a motor and transmitted to a member 6 for fixing this motor (see FIG. 1) on the part 2 then constituting a support for this motor.
Il apparaît maintenant que la présente invention permet de réaliser l'ensemble mécanique (1,2,3) en partant d'une préforme (1,2,10) monobloc et non de deux pièces 1,2 non liées l'une à l'autre, cette préforme pouvant être elle-même fabriquée en une seule opération de moulage par injection. On réduit ainsi le nombre des pièces à fabriquer et à mettre en stock, puis à manipuler lors de la fabrication de l'ensemble (1,2,3) ce qui réduit avantageusement le prix de revient de fabrication de cet ensemble, conformément au but poursuivi par la présente invention. On se réfère maintenant aux figures 6 à 11 du dessin annexé pour décrire une autre application du procédé suivant l'invention. Il s'agit de réaliser l'ensemble mécanique représenté aux figures 6 et 7, constitué par une cage 21 servant de guide pour un contact en charbon destiné à frotter sur un rotor 24 de moteur électrique, cette cage étant montée sur une platine de support 22 par l'intermédiaire d'une pièce de liaison 23 en un matériau élastique surmoulé, propre à filtrer la transmission de vibrations entre la cage 21 et la platine 22. La cage 21, de forme tubulaire, à section droite sensiblement carrée comme représenté sur la vue en coupe de la figure 7 prise suivant le trait de coupe VII-VII de la figure 6, reçoit un bâtonnet en charbon (non représenté) de forme complémentaire, qui coulisse dans la cage en étant pressé par un ressort (non représenté) qui le charge axialement contre le rotor 24.It now appears that the present invention makes it possible to produce the mechanical assembly (1,2,3) starting from a one-piece preform (1,2,10) and not from two parts 1,2 not linked to one another. 'Other, this preform can itself be manufactured in a single injection molding operation. This reduces the number of parts to manufacture and put in stock, then to handle during the manufacture of the assembly (1,2,3) which advantageously reduces the cost price of manufacturing this assembly, in accordance with the aim pursued by the present invention. Reference is now made to FIGS. 6 to 11 of the appended drawing to describe another application of the method according to the invention. This involves making the mechanical assembly shown in Figures 6 and 7, consisting of a cage 21 serving as a guide for a carbon contact intended to rub on an electric motor rotor 24, this cage being mounted on a support plate 22 by means of a connecting piece 23 of an overmolded elastic material, suitable for filtering the transmission of vibrations between the cage 21 and the plate 22. The cage 21, of tubular shape, with a substantially square cross section as shown in the sectional view of FIG. 7 taken along the section line VII-VII of FIG. 6, receives a charcoal stick (not shown) of complementary shape , which slides in the cage while being pressed by a spring (not shown) which loads it axially against the rotor 24.
Le frottement du bâtonnet contre un corps en rotation rapide tel que ce rotor est susceptible de faire vibrer ce bâtonnet. La pièce 23 a pour but d'empêcher la transmission de ces vibrations à la platine 22.The friction of the stick against a rapidly rotating body such as this rotor is likely to vibrate this stick. The object of part 23 is to prevent the transmission of these vibrations to the plate 22.
Comme pour l'ensemble (1,2,10) des figures 3 à 5, on réalise d'abord une préforme (21,22,20i) telle que représentée en vue en plan à la figure 8, dans un moule 11 ',12' représenté schématiquement en coupe à la figure 9. Dans cette préforme, les pièces 21 et 22 sont réunies en une pièce monobloc par des pattes frangibles 20i (i de 1 à 4 dans le mode de réalisation représenté) . La pièce ou cage 21 est écartée, dans la préforme, de sa position finale d'assemblage, comme cela apparaît en comparant les figures 7 et 9.As for the assembly (1,2,10) of FIGS. 3 to 5, a preform (21,22,20i) is first produced as shown in plan view in FIG. 8, in a mold 11 ′, 12 'shown schematically in section in Figure 9. In this preform, the parts 21 and 22 are joined in a single piece by frangible legs 20i (i from 1 to 4 in the embodiment shown). The part or cage 21 is moved away, in the preform, from its final assembly position, as appears by comparing FIGS. 7 and 9.
Après extraction du moule 11 ',12', la préformeAfter extracting the mold 11 ', 12', the preform
(21,22,20i) est placée (voir figure 10) dans un autre moule (7", 8") en vue du surmoulage de la pièce de liaison 23 en un matériau élastique, sur les pièces 21 et 22. Lors de la fermeture du moule (11', 12'), une surface de butée 26 du moule vient presser la pièce 21 et casser les pattes 20i pour que la pièce 21 puisse venir dans sa position finale d'assemblage avec la platine 22, représentée à la figure 11. Dans sa position de fermeture, le moule 7", 8" délimite une cavité 28 conforme à la pièce 23, cavité dans laquelle on injecte alors un matériau thermoplastique à l'état fondu pour former cette pièce 23, de manière analogue à celle utilisée pour réaliser la pièce 3 de l'ensemble fabriqué selon le procédé illustré par les figures 3 à 5.(21,22,20i) is placed (see Figure 10) in another mold (7 ", 8") for the overmolding of the connecting piece 23 in an elastic material, on the pieces 21 and 22. During the closing the mold (11 ′, 12 ′), an abutment surface 26 of the mold presses the part 21 and breaks the tabs 20i so that the part 21 can come into its final assembly position with the plate 22, shown in the FIG. 11. In its closed position, the mold 7 ", 8" delimits a cavity 28 conforming to the part 23, cavity into which a thermoplastic material is then injected in the molten state to form this part 23, in a similar manner to the one used for make the part 3 of the assembly manufactured according to the method illustrated in FIGS. 3 to 5.
Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et représentés qui n'ont été donnés qu'à titre d'exemple. C'est ainsi que l'invention peut trouver application à la suspension de tout appareil ou organe générant ou transmettant des vibrations, et non seulement à la suspension d'un moteur électrique ou de cages de balais de contact électrique pour un tel moteur. C'est ainsi encore que la préforme utilisée dans l'invention pourrait être réalisée autrement que par moulage, par exemple par emboutissage, usinage, etc...Of course, the invention is not limited to the embodiments described and shown which have been given only by way of example. Thus, the invention can find application to the suspension of any device or organ generating or transmitting vibrations, and not only to the suspension of an electric motor or of electric contact brush cages for such a motor. It is thus also that the preform used in the invention could be produced other than by molding, for example by stamping, machining, etc.
Plus généralement encore, l'invention n'est pas limitée à la réalisation de suspensions anti-vibrations, comportant une pièce de liaison en un matériau élastiquement déformable. La pièce de liaison peut avoir une fonction autre, par exemple une fonction d'isolation électrique ou thermique des pièces qu'elle assemble et être alors réalisée en un matériau électriquement ou thermiquement isolant, respectivement, par exemple. More generally still, the invention is not limited to the production of anti-vibration suspensions, comprising a connecting piece of an elastically deformable material. The connecting piece can have a different function, for example a function of electrical or thermal insulation of the parts that it assembles and then be made of an electrically or thermally insulating material, respectively, for example.

Claims

REVENDICATIONS
1. Procédé de fabrication d'un ensemble mécanique (1,2,3 ; 21,22,23) comprenant au moins deux pièces mécaniques (1,2 ; 21,22) assemblées par une pièce mécanique de liaison réalisée en un matériau moulable, caractérisé en ce que : a) on réalise une préforme (1,2,10 ; 21,22,20i) des deux pièces mécaniques (1,2 ; 21,22), dans laquelle ces deux pièces sont assemblées par au moins un moyen frangible (10,20i), dans une position relative écartée de leur position finale d'assemblage, b) on ouvre un moule (7 ',8' ; 7", 8") en deux parties propre à réaliser ladite pièce de liaison par surmoulage desdites pièces mécaniques et on installe ladite préforme (1,2,10 ; 21,22,20i) dans ledit moule (7*, 8' ; 7", 8") de manière que, lors de sa fermeture ultérieure, le moule brise ledit moyen frangible (10 ; 20j_) et entraîne lesdites pièces mécaniques dans leur position finale d'assemblage, et c) on ferme le moule (7', 8' ; 7", 8") et on injecte ledit matériau moulable dans le moule pour constituer ledit ensemble mécanique.1. Method for manufacturing a mechanical assembly (1,2,3; 21,22,23) comprising at least two mechanical parts (1,2; 21,22) assembled by a mechanical connecting part made of a moldable material , characterized in that: a) a preform (1,2,10; 21,22,20i) of the two mechanical parts (1,2; 21,22) is produced, in which these two parts are assembled by at least one frangible means (10,20i), in a relative position away from their final assembly position, b) a mold (7 ', 8'; 7 ", 8") is opened in two parts suitable for producing said connecting piece by overmolding said mechanical parts and installing said preform (1,2,10; 21,22,20i) in said mold (7 *, 8 '; 7 ", 8") so that, when it is subsequently closed, the mold breaks said frangible means (10; 20j_) and drives said mechanical parts into their final assembly position, and c) the mold is closed (7 ', 8'; 7 ", 8") and said moldable material is injected into s the mold to constitute said mechanical assembly.
2. Procédé conforme à la revendication 1, caractérisé en ce que ledit matériau moulable est propre à constituer une pièce de liaison (3 ; 23) élastiquement déformable.2. Method according to claim 1, characterized in that said moldable material is capable of constituting a connecting piece (3; 23) elastically deformable.
3. Procédé conforme à l'une quelconque des revendications 1 et 2, caractérisé en ce qu'on réalise ladite préforme (1,2,10 ; 21,22,20i) par moulage. 3. Method according to any one of claims 1 and 2, characterized in that said preform (1,2,10; 21,22,20i) is produced by molding.
4. Dispositif pour la mise en oeuvre du procédé conforme à l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il comprend : a) des moyens (11,12 ; 11 ',12') de réalisation de ladite préforme (1,2,10 ; 21,22,20i), b) un moule comportant au moins deux parties mobiles4. Device for implementing the method according to any one of claims 1 to 3, characterized in that it comprises: a) means (11,12; 11 ', 12') for producing said preform (1,2,10; 21,22,20i), b) a mold comprising at least two mobile parts
(7 ',8' ; 7", 8") l'une par rapport à l'autre entre une position d'ouverture et une position de fermeture du moule, ce moule comportant bi) des moyens pour recevoir ladite préforme (1,2,10 ; 21,22,20i) dans une position prédéterminée, b2) des moyens de butée (16 ; 26) disposés de manière à venir en prise avec ladite préforme(7 ', 8'; 7 ", 8") relative to each other between an open position and a closed position of the mold, this mold comprising bi) means for receiving said preform (1, 2.10; 21.22.20 i) in a predetermined position, b 2 ) stop means (16; 26) arranged so as to come into engagement with said preform
(1,2,10 ; 21,22,20i) pendant la fermeture du moule pour casser ledit moyen frangible (10 20i) et disposer lesdites pièces mécaniques (1,2 ; 21,22) dans leur position finale d'assemblage en fin de fermeture du moule(1,2,10; 21,22,20i) during the closing of the mold to break said frangible means (10 20i) and arrange said mechanical parts (1,2; 21,22) in their final assembly position at the end mold closing
(7', 8' ; 7", 8") et b3) des moyens définissant une cavité(7 ', 8'; 7 ", 8") and b 3 ) means defining a cavity
(18 ; 28) de moulage de ladite pièce de liaison après fermeture du moule et fixation desdites pièces mécaniques (1,2 ; 21,22) dans leur position finale d'assemblage.(18; 28) molding said connecting piece after closing the mold and fixing said mechanical parts (1,2; 21,22) in their final assembly position.
5. Dispositif conforme à la revendication 4, caractérisé en ce qu'il comprend des moyens pour injecter dans ladite cavité (18 ; 28) un matériau propre à constituer une pièce de liaison (3 ; 23) élastiquement déformable après moulage.5. Device according to claim 4, characterized in that it comprises means for injecting into said cavity (18; 28) a material suitable for constituting a connecting piece (3; 23) elastically deformable after molding.
6. Ensemble mécanique obtenu par la mise en oeuvre du procédé conforme à la revendication 2, caractérisé en ce que ladite pièce de liaison (3 ; 23) est conçue pour assurer le découplage desdites pièces mécaniques vis-à- vis de vibrations subies par l'une ou l'autre desdites pièces (1,2 ; 21,22) .6. Mechanical assembly obtained by the implementation of the method according to claim 2, characterized in that said connecting piece (3; 23) is designed to ensure the decoupling of said mechanical parts vis-à-vis vibrations undergone by the 'one or the other of said parts (1,2; 21,22).
7. Ensemble conforme à la revendication 6, caractérisé en ce que ladite pièce de liaison prend la forme d'une bague élastique (3) surmoulée sur la périphérie d'une bague rigide (1) constituant l'une desdites pièces mécaniques, cette bague rigide étant solidaire d'un organe (6) monté sur un support (2) constitué par l'autre desdites pièces mécaniques. 7. An assembly according to claim 6, characterized in that said connecting piece takes the form of an elastic ring (3) molded onto the periphery of a rigid ring (1) constituting one of said mechanical parts, this ring rigid being integral with a member (6) mounted on a support (2) formed by the other of said mechanical parts.
8. Ensemble conforme à la revendication 7, caractérisé en ce que ladite bague (3) est solidaire d'un moteur électrique.8. An assembly according to claim 7, characterized in that said ring (3) is integral with an electric motor.
9. Ensemble conforme à la revendication 7, caractérisé en ce que lesdites pièces mécaniques (21,22) sont respectivement une cage (21) de charbon de moteur électrique et une platine (22) de support de ladite cage (21) . 9. An assembly according to claim 7, characterized in that said mechanical parts (21,22) are respectively a cage (21) of electric motor coal and a plate (22) for supporting said cage (21).
PCT/FR2000/000003 1999-01-05 2000-01-04 Method and device for making a mechanical assembly comprising at least two mechanical parts assembled by a linking component made of mouldable material WO2000040393A1 (en)

Priority Applications (1)

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AU30503/00A AU3050300A (en) 1999-01-05 2000-01-04 Method and device for making a mechanical assembly comprising at least two mechanical parts assembled by linking component made of mouldable material

Applications Claiming Priority (2)

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FR99/00027 1999-01-05
FR9900027A FR2788018B1 (en) 1999-01-05 1999-01-05 METHOD AND DEVICE FOR MANUFACTURING A MECHANICAL ASSEMBLY COMPRISING AT LEAST TWO MECHANICAL PARTS ASSEMBLED BY A CONNECTING PART MADE OF A MOLDABLE MATERIAL

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE871963C (en) * 1951-03-28 1953-04-13 Werner Glass Process for the production of medicine bottles by injection molding of thermoplastics
GB753410A (en) * 1954-03-17 1956-07-25 United Carr Fastener Corp Improvements in and relating to the moulding of plastic articles
US4385025A (en) * 1979-10-22 1983-05-24 Barry Wright Corporation Method of coinjection molding of thermoplastic and thermoplastic elastomer
JPS61127338A (en) * 1984-11-27 1986-06-14 Showa Electric Wire & Cable Co Ltd Plastic molded member

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE871963C (en) * 1951-03-28 1953-04-13 Werner Glass Process for the production of medicine bottles by injection molding of thermoplastics
GB753410A (en) * 1954-03-17 1956-07-25 United Carr Fastener Corp Improvements in and relating to the moulding of plastic articles
US4385025A (en) * 1979-10-22 1983-05-24 Barry Wright Corporation Method of coinjection molding of thermoplastic and thermoplastic elastomer
JPS61127338A (en) * 1984-11-27 1986-06-14 Showa Electric Wire & Cable Co Ltd Plastic molded member

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 320 (M - 530) 30 October 1986 (1986-10-30) *

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FR2788018B1 (en) 2001-03-23
AU3050300A (en) 2000-07-24

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