WO2000075526A1 - Heat-bonded end piece and method for making same - Google Patents

Heat-bonded end piece and method for making same Download PDF

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Publication number
WO2000075526A1
WO2000075526A1 PCT/FR2000/001581 FR0001581W WO0075526A1 WO 2000075526 A1 WO2000075526 A1 WO 2000075526A1 FR 0001581 W FR0001581 W FR 0001581W WO 0075526 A1 WO0075526 A1 WO 0075526A1
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WO
WIPO (PCT)
Prior art keywords
end piece
heat
tip
wire
friction lining
Prior art date
Application number
PCT/FR2000/001581
Other languages
French (fr)
Other versions
WO2000075526A9 (en
Inventor
Corinne Delvenne
Yannick Fourcaudot
Bruno Agnus
Original Assignee
Compagnie Plastic Omnium
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Plastic Omnium filed Critical Compagnie Plastic Omnium
Priority to PL00345827A priority Critical patent/PL345827A1/en
Priority to AU55401/00A priority patent/AU5540100A/en
Priority to DE1101042T priority patent/DE1101042T1/en
Priority to SK177-2001A priority patent/SK1772001A3/en
Priority to EP00940467A priority patent/EP1101042A1/en
Publication of WO2000075526A1 publication Critical patent/WO2000075526A1/en
Publication of WO2000075526A9 publication Critical patent/WO2000075526A9/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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F16D66/021—Apparatus for indicating wear using electrical detection or indication means
    • F16D66/022—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness
    • F16D66/023—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness directly sensing the position of braking members
    • F16D66/024—Sensors mounted on braking members adapted to contact the brake disc or drum, e.g. wire loops severed on contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/70—Insulation of connections
    • H01R4/72—Insulation of connections using a heat shrinking insulating sleeve

Definitions

  • the present invention relates to a device for detecting wear of friction linings, in particular of brake pad linings and to a process for heat-sealing such a nozzle.
  • friction linings are used which are intended to come into contact with moving parts in order to reduce their speed by friction.
  • certain devices for detecting wear of brake pads include a tip which covers the end of an electrical conductor wire, said tip being inserted into a hole made for this purpose in the friction lining subject to the plate. -support of this garnish.
  • the advantage of such a tip lies in the fact that it makes it possible to precisely position the end of the electrical conductor wire relative to the wear surface of the friction lining, which guarantees good precision in the detection of the minimum thickness from which it is necessary to replace the friction lining.
  • the production of such a nozzle is generally carried out by overmolding of a plastic material at the end of the electrical conductor wire or else by molding of a nozzle or machining of a nozzle in a bar of plastic, then insertion and bonding of the wire inside the end piece.
  • Such operations entail relatively high manufacturing costs because of the numerous manipulations they involve and also, for the bonding of the end piece, due to the price of the glue.
  • the bonding of the wire poses problems of positioning the wire in the nozzle, said wire being able to move as long as the setting of the adhesive is not carried out.
  • the present invention aims to provide a device for detecting wear of friction lining which does not have these drawbacks and which is, moreover, of a particularly simple and economical embodiment.
  • the subject of the present invention is a device for detecting wear of friction lining, in particular of a brake pad, intended to be inserted into an orifice provided for this purpose in a friction lining or subject to a support plate carrying this lining, of the type comprising a hollow end piece and a sheathed electrical conductor wire fitted into this end piece, characterized in that the end piece is heat-sealed on the sheath of the electrical conductive wire.
  • the tip can be obtained from molding, for example by injection or compression, or be obtained by machining a bar of plastic material.
  • the tip of the device according to the invention has the advantage of being able to be placed at the end of an electrical conductor wire in a particularly simple manner, since it suffices to insert the electrical conductor wire inside the end piece without adding glue and then heat sealing the end piece on the wire.
  • the tip can be used in a wear detection device with tangential wear or in a wear detection device with front wear.
  • the electrical conductor wire can be provided with an electrical contact piece at its stripped end, for example the contact piece described by the Applicant Company in French patent application no. 93 01838 published under number 2 701 743.
  • an electrical contact piece maintains the electrical conductor wire in the axial direction of the end piece and ensures frank electrical contact with the brake disc of the braking system when the pads are worn.
  • the heat-sealed end piece is electrically insulating, watertight in the entire temperature range of use of the friction lining and mechanically resistant to the forces resulting from the expansion of the core of the electrically conductive wire. subject to temperature variations.
  • the tip is made of thermoplastic material such as PA (polyamide), PEEK (polyetheretherketone), PCL (liquid crystal polymer), PTFE (polytetrafluoroethylene).
  • the sheath of the electrical conductor consists of braided glass fibers and coated, individually or collectively, with a plastic material such as silicone.
  • the external lateral surface of the end piece comprises means for retaining in the orifice provided for its insertion into the friction lining.
  • the present invention also relates to a process for heat-sealing a nozzle as described above, characterized in that it consists in inserting the electric conducting wire into the nozzle and in applying the nozzle against a hot tool. to cause simultaneous fusion of the end cap and the sheath of the electrical conductor wire.
  • the tip is applied against the hot tool by moving it axially in a frustoconical orifice of this tool.
  • the tip is placed between two blocks constituting the tool and the two blocks are joined together.
  • FIG. 1 represents a first end piece intended to be heat sealed on an electrical conductive wire
  • FIG. 2 represents a second end piece intended to be heat sealed on an electrical conductive wire
  • FIG. 3 represents a third end piece intended to be heat-welded on an electric conductive wire
  • FIG. 4 is a perspective view of a half-heat-sealing tool provided for placing the end-piece of FIG. 1 on an electric conductor wire,
  • FIG. 4A is a sectional view along IVA-IVA of FIG. 4,
  • FIG. 5 is a perspective view of a half-tool allowing the heat-sealing the tip of FIG. 2 on an electrical conducting wire
  • FIG. 5 A is a sectional view along NA-VA of FIG. 5,
  • FIG. 6 is a perspective view of a half-tool for heat-welding the end piece of FIG. 3 on the electric conductive wire
  • - FIG. 6A is a sectional view along NIA-VIA of FIG. 6,
  • FIG. 7 is a perspective view of the nozzle of FIG. 1 and of the tool of FIG. 4 at the start of the heat-sealing operation
  • FIG. 7A is a sectional view along VIIA-NIIA of FIG. 7,
  • FIGS. 8 to 11 are sectional views along A- A of FIG. 7, limited to the vicinity of the end piece and showing four stages of the heat-sealing operation,
  • FIGS. 12 to 15 are top views of FIGS. 8 to 11,
  • FIG. 16 is a view similar to Figure 7 illustrating another use of the heat-sealing tool, - Figure 16A is a sectional view along XNIA-XVIA of Figure 16.
  • the end pieces 1, 2, 3 shown in Figures 1 to 3 each have the same front part 4 (on the left in the figures) constituted by a cylindrical sleeve 5 closed by a front wall 6 and provided with a flange 7 to the opposite of this front wall.
  • the front wall 6 is the part of the end piece which is intended to come into contact with the disc (not shown) of a braking system and to wear out when the friction lining of the braking system reaches a level of wear requiring replacement.
  • the disc comes into electrical contact with the electrical conductor wire introduced into the tip, or with a contact piece mounted on the stripped end of the wire introduced into the tip.
  • the flange 7 serves as a shoulder when the tip is introduced into an orifice provided for this purpose in a friction lining, as is well known.
  • the rear part 8, 9, 10 of the end piece differs between the three end pieces of figures 1, 2 and 3.
  • this rear part 9 is frustoconical. In FIG. 2, it is cylindrical 9 and in FIG. 3, it is cylindrical and split 10. - -
  • This rear part 8, 9, 10 is intended to be heat sealed on the sheath of the electrically conductive wire introduced into the end piece.
  • FIGS. 4, 5 and 6 show tools 11, 12, 13 which can be used to heat seal the end pieces of FIGS. 1, 2 and 3.
  • Each tool comprises two blocks 14, 15, 16, 17, as can be seen in FIGS. 7 and 16, only one 14, 16, 17 of these blocks being shown in perspective in FIGS. 4, 5 and 6.
  • Each block comprises a first longitudinal channel 18 intended to receive heating cartridges 19 which bring each metal block to the temperature necessary for heat sealing the end piece on the sheath of the electrically conductive wire.
  • Each block also comprises two transverse channels 20 intended to receive guide bars 21 by means of which the two blocks of the tool can move away or come closer while remaining in alignment with one another.
  • each block On its face opposite the other block, each block has a semi-cylindrical clearance 22 of large diameter opening on its lower face 23, leaving on the upper face 24 a wall 25 of thickness slightly less than the length of the part rear 8, 9, 10 (to heat seal) of the nozzle.
  • a groove 26, 27, 28 is formed, the shape of which corresponds to that of the rear part of the end piece 1, 2, 3.
  • this groove 26 is semi-conical. It is semi-cylindrical 27 in FIG. 5.
  • FIG. 6 it comprises, on the one hand, a semi-conical upper part directed upwards and extending over most of the thickness of the wall, on the other hand, a semi-conical lower part directed down. These two semi-conical parts 28 in opposition form a constriction.
  • the facing grooves delimit an orifice 29 connecting the upper face 24 of the tool to the cylindrical clearance 22 of the lower face 23.
  • the electrical conductor wire 30 provided at its stripped end with a contact piece 31 is fitted into the nozzle.
  • the assembly thus prepared is engaged by the lower face 23 of the tool between its two separate blocks, until the flange 7 of the nozzle arrives above the upper wall 24 of the tool, while the part of the conductive wire 30 exiting the end piece is located between the grooves 26 and recesses 22 facing the two blocks, as shown in FIGS. 9 and 13.
  • the two blocks 14, 15 are then brought together. .
  • the guide bars 21 ensure a precise facing of the two grooves 26 which reconstitute the frustoconical orifice 29 enclosing the lower end of the end piece.
  • the wire 30, trapped in this frustoconical orifice, is free to slide axially therein because the external diameter of its sheath 32 is smaller than that of the orifice 29.
  • the tip is moved axially towards the tool, which brings its rear part 8 into contact with the walls of the orifice 29, as can be seen in FIG. 10, then a pressure on the endpiece to push it into the orifice 29 until the flange 7 comes to bear against the upper face 24 of the tool.
  • the rear end of the end-piece is brought, by contact with the hot walls of the orifice, to its melting temperature and it deforms by being crushed on the sheath 32 of the electric conducting wire, which is, by conduction, also brought to its melting temperature.
  • the two blocks are separated from each other (as shown in FIG. 15), the end piece being held between the two blocks so that the end piece and the wire sheath is no longer in contact with the tool, which allows them to cool and harden by welding together.
  • the heat-sealed end cap and wire are then removed from the tooling.
  • a second method is used to heat seal the end piece on the sheath of the electric conducting wire.
  • the endpiece is positioned between the two separate blocks of the tooling with its collar 7 at the height of the upper face 24 of the two blocks, as seen in FIG. 16A.
  • the rear part 8 of the end piece is therefore opposite the two grooves 26 of the blocks and protrudes beyond the grooves, opposite the semi-cylindrical recesses of large diameter.

Abstract

The invention concerns a wear detecting device for friction lining, in particular a brake pad, designed to be inserted in an orifice provided therefor in a friction lining or fixed to a mounting plate bearing said lining, comprising a hollow end piece (1, 2, 3) and a sheathed electrical conducting wire (30) fitted into said end piece (1, 2, 3). The end piece (1, 2, 3) is heat-bonded on the electrical conducting wire sheath (32)

Description

Embout d'usure theπàosoudé Theπàosoudé wear tip
La présente invention est relative à un dispositif de détection d'usure de garnitures de friction, notamment de garnitures de plaquettes de frein et à un procédé de thermosoudage d'un tel embout. Dans de nombreux domaines techniques, notamment pour la réalisation de systèmes de freinage de véhicules, on utilise des garnitures de friction qui sont destinées à venir au contact de pièces en mouvement pour en réduire la vitesse par frottement.The present invention relates to a device for detecting wear of friction linings, in particular of brake pad linings and to a process for heat-sealing such a nozzle. In many technical fields, in particular for the production of vehicle braking systems, friction linings are used which are intended to come into contact with moving parts in order to reduce their speed by friction.
Par exemple, pour réaliser un frein à disque sur une roue de voiture, on dispose deux plaquettes de freins de part et d'autre d'un disque solidaire de cette roue, pla- quettes qui sont susceptibles, lors du freinage, d'être comprimées sur celui-ci pour diminuer sa vitesse de rotation par frottement.For example, to make a disc brake on a car wheel, there are two brake pads on either side of a disc integral with this wheel, pads which are liable, during braking, to be compressed thereon to decrease its speed of rotation by friction.
Bien entendu, ce fonctionnement s'accompagne de l'usure des plaquettes et il est nécessaire de remplacer ces dernières, dès que l'épaisseur de leur garniture devient trop faible. Pour détecter l'usure des garnitures de friction, on connaît des dispositifs de détection d'usure qui, reliés à un circuit électrique, permettent de signaler le moment à partir duquel il s'avère nécessaire de procéder au remplacement des plaquettes.Of course, this operation is accompanied by the wear of the pads and it is necessary to replace the latter, as soon as the thickness of their lining becomes too small. To detect the wear of the friction linings, wear detection devices are known which, connected to an electrical circuit, make it possible to signal the moment from which it becomes necessary to replace the pads.
On sait que certains dispositifs de détection d'usure de plaquettes de freins comportent un embout qui vient coiffer l'extrémité d'un fil conducteur électrique, ledit embout étant inséré dans un trou ménagé à cet effet dans la garniture de friction assujetti à la plaque-support de cette garniture.It is known that certain devices for detecting wear of brake pads include a tip which covers the end of an electrical conductor wire, said tip being inserted into a hole made for this purpose in the friction lining subject to the plate. -support of this garnish.
L'avantage d'un tel embout réside dans le fait qu'il permet de positionner de façon précise l'extrémité du fil conducteur électrique par rapport à la surface d'usure de la garniture de friction, ce qui garantit une bonne précision dans la détection de l'épais- seur minimale à partir de laquelle il est nécessaire de remplacer la garniture de friction. La réalisation d'un tel embout s'effectue généralement par surmoulage d'une matière plastique à l'extrémité du fil conducteur électrique ou encore par moulage d'un embout ou usinage d'un embout dans une barre de matière plastique, puis insertion et collage du fil à l'intérieur de l'embout. De telles opérations entraînent des coûts de fabrication relativement importants en raison des nombreuses manipulations qu'elles impliquent et également, pour le collage de l'embout, en raison du prix de la colle. De plus, le collage du fil pose des problèmes de positionnement du fil dans l'embout, ledit fil pouvant bouger tant que la prise de la colle n'est pas effectuée.The advantage of such a tip lies in the fact that it makes it possible to precisely position the end of the electrical conductor wire relative to the wear surface of the friction lining, which guarantees good precision in the detection of the minimum thickness from which it is necessary to replace the friction lining. The production of such a nozzle is generally carried out by overmolding of a plastic material at the end of the electrical conductor wire or else by molding of a nozzle or machining of a nozzle in a bar of plastic, then insertion and bonding of the wire inside the end piece. Such operations entail relatively high manufacturing costs because of the numerous manipulations they involve and also, for the bonding of the end piece, due to the price of the glue. In addition, the bonding of the wire poses problems of positioning the wire in the nozzle, said wire being able to move as long as the setting of the adhesive is not carried out.
La présente invention vise à fournir un dispositif de détection d'usure de garniture de friction qui ne présente pas ces inconvénients et qui est, en outre, d'une réalisation particulièrement simple et économique.The present invention aims to provide a device for detecting wear of friction lining which does not have these drawbacks and which is, moreover, of a particularly simple and economical embodiment.
La présente invention a pour objet un dispositif de détection d'usure de garniture de friction, notamment de plaquette de frein, destiné à être inséré dans un orifice ménagé à cet effet dans une garniture de friction ou assujetti à une plaque-support por- tant cette garniture, du type comportant un embout creux et un fil conducteur électrique gainé emmanché dans cet embout, caractérisé par le fait que l'embout est thermosoudé sur la gaine du fil conducteur électrique.The subject of the present invention is a device for detecting wear of friction lining, in particular of a brake pad, intended to be inserted into an orifice provided for this purpose in a friction lining or subject to a support plate carrying this lining, of the type comprising a hollow end piece and a sheathed electrical conductor wire fitted into this end piece, characterized in that the end piece is heat-sealed on the sheath of the electrical conductive wire.
Selon l'invention, l'embout peut être issu de moulage, par exemple par injection ou compression, ou être obtenu par usinage d'une barre de matière plastique. On comprend que l'embout du dispositif selon l'invention présente l'avantage de pouvoir être mis en place à l'extrémité d'un fil conducteur électrique de façon particulièrement simple, puisqu'il suffit d'insérer le fil conducteur électrique à l'intérieur de l'embout sans ajout de colle puis de thermosouder l'embout sur le fil.According to the invention, the tip can be obtained from molding, for example by injection or compression, or be obtained by machining a bar of plastic material. We understand that the tip of the device according to the invention has the advantage of being able to be placed at the end of an electrical conductor wire in a particularly simple manner, since it suffices to insert the electrical conductor wire inside the end piece without adding glue and then heat sealing the end piece on the wire.
Selon l'invention, l'embout peut être utilisé dans un dispositif de détection d'usure à usure tangentielle ou dans un dispositif de détection d'usure à usure frontale.According to the invention, the tip can be used in a wear detection device with tangential wear or in a wear detection device with front wear.
Selon l'invention, le fil conducteur électrique peut être muni d'une pièce de contact électrique à son extrémité dénudée, par exemple la pièce de contact décrite par la Société demanderesse dans la demande de brevet français n° 93 01838 publiée sous le numéro 2 701 743. Une telle pièce de contact maintient le fil conducteur électrique dans la direction axiale de l'embout et assure un contact électrique franc avec le disque de frein du système de freinage lorsque les plaquettes sont usées.According to the invention, the electrical conductor wire can be provided with an electrical contact piece at its stripped end, for example the contact piece described by the Applicant Company in French patent application no. 93 01838 published under number 2 701 743. Such a contact piece maintains the electrical conductor wire in the axial direction of the end piece and ensures frank electrical contact with the brake disc of the braking system when the pads are worn.
Conformément à l'invention, l'embout thermosoudé est électriquement isolant, étanche à l'eau dans tout le domaine de température d'utilisation de la garniture de friction et mécaniquement résistant aux efforts résultant des dilatations de l'âme du fil conducteur électrique également soumise à des variations de température. Dans un mode de réalisation particulier de l'invention, l'embout est réalisé en matière thermoplastique telle que PA (polyamide), PEEK (polyétheréthercétone), PCL (polymère à cristaux liquides), PTFE (polytétrafluoroéthylène).In accordance with the invention, the heat-sealed end piece is electrically insulating, watertight in the entire temperature range of use of the friction lining and mechanically resistant to the forces resulting from the expansion of the core of the electrically conductive wire. subject to temperature variations. In a particular embodiment of the invention, the tip is made of thermoplastic material such as PA (polyamide), PEEK (polyetheretherketone), PCL (liquid crystal polymer), PTFE (polytetrafluoroethylene).
Dans un mode de réalisation particulier de l'invention, la gaine du fil con- ducteur électrique est constituée par des fibres de verre tressées et revêtues, individuellement ou collectivement, d'une matière plastique telle que du silicone.In a particular embodiment of the invention, the sheath of the electrical conductor consists of braided glass fibers and coated, individually or collectively, with a plastic material such as silicone.
Dans un mode de réalisation préféré de l'invention, la surface latérale externe de l'embout comporte des moyens de retenue dans l'orifice prévu pour son insertion dans la garniture de friction. La présente invention a également pour objet un procédé de thermosoudage d'un embout tel que décrit ci-dessus, caractérisé par le fait qu'il consiste à insérer le fil conducteur électrique dans l'embout et à appliquer l'embout contre un outillage chaud pour provoquer la fusion simultanée de l'embout et de la gaine du fil conducteur électrique. Selon un premier mode de mise en œuvre de ce procédé, on applique l'embout contre l'outillage chaud en le déplaçant axialement dans un orifice tronconique de cet outillage.In a preferred embodiment of the invention, the external lateral surface of the end piece comprises means for retaining in the orifice provided for its insertion into the friction lining. The present invention also relates to a process for heat-sealing a nozzle as described above, characterized in that it consists in inserting the electric conducting wire into the nozzle and in applying the nozzle against a hot tool. to cause simultaneous fusion of the end cap and the sheath of the electrical conductor wire. According to a first mode of implementation of this method, the tip is applied against the hot tool by moving it axially in a frustoconical orifice of this tool.
Selon un autre mode de mise en œuvre, on place l'embout entre deux blocs constituant l'outillage et l'on réuni les deux blocs l'un contre l'autre. Dans le but de mieux comprendre l'invention, on va en décrire maintenant des modes de réalisation donnés à titre d'exemples non limitatifs de la portée de l'invention, en référence au dessin annexé dans lequel :According to another embodiment, the tip is placed between two blocks constituting the tool and the two blocks are joined together. In order to better understand the invention, we will now describe embodiments given by way of non-limiting examples of the scope of the invention, with reference to the accompanying drawing in which:
- la figure 1 représente un premier embout destiné à être thermosoudé sur un fil conducteur électrique, - la figure 2 représente un deuxième embout destiné à être thermosoudé sur un fil conducteur électrique,FIG. 1 represents a first end piece intended to be heat sealed on an electrical conductive wire, FIG. 2 represents a second end piece intended to be heat sealed on an electrical conductive wire,
- la figure 3 représente un troisième embout destiné à être thermosoudé sur un fil conducteur électrique,FIG. 3 represents a third end piece intended to be heat-welded on an electric conductive wire,
- la figure 4 est une vue en perspective d'un demi-outillage de thermosou- dage prévu pour mettre en place l'embout de la figure 1 sur un fil conducteur électrique,FIG. 4 is a perspective view of a half-heat-sealing tool provided for placing the end-piece of FIG. 1 on an electric conductor wire,
- la figure 4A est une vue en coupe selon IVA-IVA de la figure 4,FIG. 4A is a sectional view along IVA-IVA of FIG. 4,
- la figure 5 est une vue en perspective d'un demi-outillage permettant le thermosoudage de l'embout de la figure 2 sur un fil conducteur électrique,- Figure 5 is a perspective view of a half-tool allowing the heat-sealing the tip of FIG. 2 on an electrical conducting wire,
- la figure 5 A est une vue en coupe selon NA-VA de la figure 5,FIG. 5 A is a sectional view along NA-VA of FIG. 5,
- la figure 6 est une vue en perspective d'un demi-outillage pour thermo- souder l'embout de la figure 3 sur le fil conducteur électrique, - la figure 6A est une vue en coupe selon NIA- VIA de la figure 6,FIG. 6 is a perspective view of a half-tool for heat-welding the end piece of FIG. 3 on the electric conductive wire, - FIG. 6A is a sectional view along NIA-VIA of FIG. 6,
- la figure 7 est une vue en perspective de l'embout de la figure 1 et de l'outillage de la figure 4 au début de l'opération de thermosoudage,FIG. 7 is a perspective view of the nozzle of FIG. 1 and of the tool of FIG. 4 at the start of the heat-sealing operation,
- la figure 7A est une vue en coupe selon VIIA-NIIA de la figure 7,FIG. 7A is a sectional view along VIIA-NIIA of FIG. 7,
- les figures 8 à 11 sont des vues en coupe selon A- A de la figure 7, limi- tées au voisinage de l'embout et montrant quatre étapes de l'opération de thermosoudage,FIGS. 8 to 11 are sectional views along A- A of FIG. 7, limited to the vicinity of the end piece and showing four stages of the heat-sealing operation,
- les figures 12 à 15 sont des vues de dessus des figures 8 à 11,FIGS. 12 to 15 are top views of FIGS. 8 to 11,
- la figure 16 est une vue analogue à la figure 7 illustrant une autre utilisation de l'outillage de thermosoudage, - la figure 16A est une vue en coupe selon XNIA-XVIA de la figure 16.- Figure 16 is a view similar to Figure 7 illustrating another use of the heat-sealing tool, - Figure 16A is a sectional view along XNIA-XVIA of Figure 16.
Les embouts 1, 2, 3 représentés sur les figures 1 à 3 comportent chacun une même partie avant 4 (à gauche sur les figures) constituée par un manchon cylindrique 5 obturé par une paroi frontale 6 et muni d'une collerette 7 à l'opposé de cette paroi frontale. La paroi frontale 6 est la partie de l'embout qui est destiné à entrer en contact avec le disque (non représenté) d'un système de freinage et à s'user lorsque la garniture de friction du système de freinage atteint un niveau d'usure nécessitant son remplacement.The end pieces 1, 2, 3 shown in Figures 1 to 3 each have the same front part 4 (on the left in the figures) constituted by a cylindrical sleeve 5 closed by a front wall 6 and provided with a flange 7 to the opposite of this front wall. The front wall 6 is the part of the end piece which is intended to come into contact with the disc (not shown) of a braking system and to wear out when the friction lining of the braking system reaches a level of wear requiring replacement.
Lorsque tel est le cas, le disque entre en contact électrique avec le fil con- ducteur électrique introduit dans l'embout, ou avec une pièce de contact montée sur l'extrémité dénudée du fil introduit dans l'embout.When this is the case, the disc comes into electrical contact with the electrical conductor wire introduced into the tip, or with a contact piece mounted on the stripped end of the wire introduced into the tip.
La collerette 7 sert d'épaulement lors de l'introduction de l'embout dans un orifice ménagé à cet effet dans une garniture de friction, comme cela est bien connu.The flange 7 serves as a shoulder when the tip is introduced into an orifice provided for this purpose in a friction lining, as is well known.
La partie arrière 8, 9, 10 de l'embout diffère entre les trois embouts des figu- res 1, 2 et 3.The rear part 8, 9, 10 of the end piece differs between the three end pieces of figures 1, 2 and 3.
Sur la figure 1, cette partie arrière 9 est tronconique. Sur la figure 2, elle est cylindrique 9 et sur la figure 3, elle est cylindrique et fendue 10. - -In Figure 1, this rear part 9 is frustoconical. In FIG. 2, it is cylindrical 9 and in FIG. 3, it is cylindrical and split 10. - -
Cette partie arrière 8, 9, 10 est destinée à être thermosoudée sur la gaine du fil conducteur électrique introduit dans l'embout.This rear part 8, 9, 10 is intended to be heat sealed on the sheath of the electrically conductive wire introduced into the end piece.
A cet effet, différents outillages peuvent être utilisés.For this purpose, different tools can be used.
Les figures 4, 5 et 6 représentent des outillages 11, 12, 13 utilisables pour thermosouder les embouts des figures 1, 2 et 3.FIGS. 4, 5 and 6 show tools 11, 12, 13 which can be used to heat seal the end pieces of FIGS. 1, 2 and 3.
Chaque outillage comporte deux blocs 14, 15, 16, 17, comme on le voit aux figures 7 et 16, un seul 14, 16, 17 de ces blocs étant représenté en perspective sur les figures 4, 5 et 6.Each tool comprises two blocks 14, 15, 16, 17, as can be seen in FIGS. 7 and 16, only one 14, 16, 17 of these blocks being shown in perspective in FIGS. 4, 5 and 6.
Chaque bloc comprend un premier canal longitudinal 18 destiné à recevoir des cartouches chauffantes 19 qui amènent chaque bloc métallique à la température nécessaire au thermosoudage de l'embout sur la gaine du fil conducteur électrique.Each block comprises a first longitudinal channel 18 intended to receive heating cartridges 19 which bring each metal block to the temperature necessary for heat sealing the end piece on the sheath of the electrically conductive wire.
Chaque bloc comporte également deux canaux transversaux 20 destinés à recevoir des barres de guidage 21 grâce auxquelles les deux blocs de l'outillage peuvent s'écarter ou se rapprocher en demeurant dans l'alignement l'une de l'autre. Sur sa face en regard de l'autre bloc, chaque bloc comporte une dégagement demi-cylindrique 22 de grand diamètre débouchant sur sa face inférieure 23, laissant sur la face supérieure 24 une paroi 25 d'épaisseur légèrement inférieure à la longueur de la partie arrière 8, 9, 10 (à thermosouder) de l'embout.Each block also comprises two transverse channels 20 intended to receive guide bars 21 by means of which the two blocks of the tool can move away or come closer while remaining in alignment with one another. On its face opposite the other block, each block has a semi-cylindrical clearance 22 of large diameter opening on its lower face 23, leaving on the upper face 24 a wall 25 of thickness slightly less than the length of the part rear 8, 9, 10 (to heat seal) of the nozzle.
Dans cette paroi, est ménagée une gorge 26, 27, 28 dont la forme corres- pond à celle de la partie arrière de l'embout 1, 2, 3.In this wall, a groove 26, 27, 28 is formed, the shape of which corresponds to that of the rear part of the end piece 1, 2, 3.
Sur la figure 4, cette gorge 26 est demi-conique. Elle est demi-cylindrique 27 sur la figure 5.In Figure 4, this groove 26 is semi-conical. It is semi-cylindrical 27 in FIG. 5.
Sur la figure 6, elle comporte, d'une part, une partie supérieure demi- conique dirigée vers le haut et s'étendant sur la majeure partie de l'épaisseur de la paroi, d'autre part, une partie inférieure demi-conique dirigée vers le bas. Ces deux parties demi-coniques 28 en opposition forment un étranglement.In FIG. 6, it comprises, on the one hand, a semi-conical upper part directed upwards and extending over most of the thickness of the wall, on the other hand, a semi-conical lower part directed down. These two semi-conical parts 28 in opposition form a constriction.
Lorsque les deux blocs de chaque outillage sont réunis, les gorges en regard délimitent un orifice 29 reliant la face supérieure 24 de l'outillage au dégagement cylindrique 22 de la face inférieure 23.When the two blocks of each tool are joined together, the facing grooves delimit an orifice 29 connecting the upper face 24 of the tool to the cylindrical clearance 22 of the lower face 23.
On va maintenant décrire, en référence aux figures 8 à 15, un premier procédé de thermosoudage de l'embout sur la gaine du fil conducteur électrique. Chaque bloc de l'outillage est chauffé par insertion d'une cartouche chauffante 19 dans son canal transversal 18.We will now describe, with reference to FIGS. 8 to 15, a first method of heat-sealing the end piece on the sheath of the electrically conductive wire. Each block of the tool is heated by inserting a heating cartridge 19 in its transverse channel 18.
Comme on le voit à la figure 8, le fil conducteur électrique 30 muni à son extrémité dénudée d'une pièce de contact 31 est emmanché dans l'embout. L'ensemble ainsi préparé est engagé par la face inférieure 23 de l'outillage entre ses deux blocs séparés, jusqu'à ce que la collerette 7 de l'embout arrive au-dessus de la paroi supérieure 24 de l'outillage, tandis que la partie du fil conducteur 30 sortant de l'embout se trouve entre les gorges 26 et dégagements 22 en regard des deux blocs, comme représenté aux figures 9 et 13. Les deux blocs 14, 15 sont ensuite rapprochés l'un de l'autre.As seen in Figure 8, the electrical conductor wire 30 provided at its stripped end with a contact piece 31 is fitted into the nozzle. The assembly thus prepared is engaged by the lower face 23 of the tool between its two separate blocks, until the flange 7 of the nozzle arrives above the upper wall 24 of the tool, while the part of the conductive wire 30 exiting the end piece is located between the grooves 26 and recesses 22 facing the two blocks, as shown in FIGS. 9 and 13. The two blocks 14, 15 are then brought together. .
Lors de ce rapprochement, les barres de guidage 21 assurent une mise en regard précise des deux gorges 26 qui reconstituent l'orifice tronconique 29 enfermant l'extrémité inférieure de l'embout.During this approximation, the guide bars 21 ensure a precise facing of the two grooves 26 which reconstitute the frustoconical orifice 29 enclosing the lower end of the end piece.
Le fil 30, emprisonné dans cet orifice tronconique, est libre d'y coulisser axialement du fait que le diamètre externe de sa gaine 32 est plus petit que celui de l'orifice 29.The wire 30, trapped in this frustoconical orifice, is free to slide axially therein because the external diameter of its sheath 32 is smaller than that of the orifice 29.
L'outillage étant maintenu dans cette position, on déplace l'embout axialement vers l'outillage, ce qui amène sa partie arrière 8 au contact des parois de l'orifice 29, comme on le voit sur la figure 10, puis on applique une pression sur l'embout pour l'enfoncer dans l'orifice 29 jusqu'à ce que la collerette 7 vienne s'appuyer contre la face supérieure 24 de l'outillage.The tool being maintained in this position, the tip is moved axially towards the tool, which brings its rear part 8 into contact with the walls of the orifice 29, as can be seen in FIG. 10, then a pressure on the endpiece to push it into the orifice 29 until the flange 7 comes to bear against the upper face 24 of the tool.
L'extrémité arrière de l'embout est portée, par contact avec les parois chaudes de l'orifice, à sa température de fusion et elle se déforme en s'écrasant sur la gaine 32 du fil conducteur électrique, laquelle est, par conduction, également portée à sa tem- pérature de fusion.The rear end of the end-piece is brought, by contact with the hot walls of the orifice, to its melting temperature and it deforms by being crushed on the sheath 32 of the electric conducting wire, which is, by conduction, also brought to its melting temperature.
La matière constituant l'embout qui est fondue sous l'effet de la chaleur flue dans le petit volume 33 laissé entre l'embout dans sa forme initiale et l'outillage.The material constituting the end piece which is melted under the effect of the heat flowing in the small volume 33 left between the end piece in its initial form and the tool.
A l'issue d'un intervalle de temps relativement court, les deux blocs sont séparés l'un de l'autre (comme représenté à la figure 15), l'embout étant maintenu entre les deux blocs de sorte que l'embout et la gaine du fil ne se trouvent plus au contact de l'outillage, ce qui leur permet de refroidir et de durcir en se soudant l'un à l'autre. L'embout et le fil conducteur thermosoudés sont ensuite retirés de l'outillage.At the end of a relatively short time interval, the two blocks are separated from each other (as shown in FIG. 15), the end piece being held between the two blocks so that the end piece and the wire sheath is no longer in contact with the tool, which allows them to cool and harden by welding together. The heat-sealed end cap and wire are then removed from the tooling.
Dans le mode de réalisation illustré par les figures 16 et 16A, on met en œuvre un deuxième procédé pour thermosouder l'embout sur la gaine du fil conducteur électrique.In the embodiment illustrated in FIGS. 16 and 16A, a second method is used to heat seal the end piece on the sheath of the electric conducting wire.
Au début de l'opération de thermosoudage, l'embout est positionné entre les deux blocs séparés de l'outillage avec sa collerette 7 à hauteur de la face supérieure 24 des deux blocs, comme on le voit à la figure 16A.At the start of the heat-sealing operation, the endpiece is positioned between the two separate blocks of the tooling with its collar 7 at the height of the upper face 24 of the two blocks, as seen in FIG. 16A.
La partie arrière 8 de l'embout se trouve donc en regard des deux gorges 26 des blocs et dépasse, au-delà des gorges, en regard des évidements demi-cylindriques de grand diamètre.The rear part 8 of the end piece is therefore opposite the two grooves 26 of the blocks and protrudes beyond the grooves, opposite the semi-cylindrical recesses of large diameter.
Le rapprochement l'un vers l'autre des deux blocs, guidés par les barres de guidage 21, provoque l'écrasement de la partie arrière.The bringing together of the two blocks, guided by the guide bars 21, causes the rear part to be crushed.
L'embout 1 et la gaine 32 fusionnent comme précédemment décrit et les deux blocs sont à nouveau écartés pour permettre au soudage de se réaliser.The end piece 1 and the sheath 32 merge as previously described and the two blocks are again separated to allow welding to take place.
Ce procédé est notamment adapté au thermosoudage des embouts des figures 2 et 3.This process is particularly suitable for heat sealing the end pieces of Figures 2 and 3.
Il est bien entendu que les modes de réalisations qui viennent d'être décrits ne présentent aucun caractère limitatif et qu'ils pourront recevoir toutes modifications désirables sans sortir pour cela du cadre de l'invention. It is understood that the embodiments which have just been described have no limiting character and that they can receive any desirable modifications without departing from the scope of the invention.

Claims

_ _REVENDICATIONS _ _ CLAIMS
1. Dispositif de détection d'usure de garniture de friction, notamment de plaquette de frein, destiné à être inséré dans un orifice ménagé à cet effet dans une garniture de friction ou assujetti à une plaque-support portant cette garniture, du type com- portant un embout creux (1, 2, 3) et un fil conducteur électrique (30) gainé emmanché dans cet embout, caractérisé par le fait que l'embout (1, 2, 3) est thermosoudé sur la gaine (32) du fil conducteur électrique.1. Device for detecting wear of friction lining, in particular of a brake pad, intended to be inserted into an orifice provided for this purpose in a friction lining or subject to a support plate carrying this lining, of the type carrying a hollow end piece (1, 2, 3) and a sheathed electrical conductor wire (30) fitted in this end piece, characterized in that the end piece (1, 2, 3) is heat-sealed on the sheath (32) of the wire electrical conductor.
2. Dispositif selon la revendication 1, caractérisé par le fait que l'embout (1, 2, 3) est issu de moulage, par exemple par injection ou compression. 3. Dispositif selon la revendication 1, caractérisé par le fait que l'embout (1,2. Device according to claim 1, characterized in that the end piece (1, 2, 3) comes from molding, for example by injection or compression. 3. Device according to claim 1, characterized in that the end piece (1,
2, 2,
3) est obtenu par usinage d'une barre de matière plastique.3) is obtained by machining a plastic bar.
4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé par le fait que l'embout est réalisé en matière thermoplastique telle que polyamide, polyétheréthercétone, polymère à cristaux liquides, polytétrafluoroéthylène. 4. Device according to any one of claims 1 to 3, characterized in that the nozzle is made of thermoplastic material such as polyamide, polyetheretherketone, liquid crystal polymer, polytetrafluoroethylene.
5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que le fil conducteur électrique (30) est muni d'une pièce de contact électrique (31) à son extrémité dénudée.5. Device according to any one of claims 1 to 4, characterized in that the electrical conductor wire (30) is provided with an electrical contact piece (31) at its stripped end.
6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé par le fait que la gaine du fil conducteur électrique est constituée par des fibres de verre tressées et revêtues, individuellement ou collectivement, d'une matière plastique telle que du silicone.6. Device according to any one of claims 1 to 5, characterized in that the sheath of the electrically conductive wire consists of braided glass fibers and coated, individually or collectively, with a plastic material such as silicone.
7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé par le fait que l'embout thermosoudé est électriquement isolant, étanche à l'eau dans tout le domaine de température d'utilisation de la garniture de friction et mécaniquement résis- tant aux efforts résultant des dilatations de l'âme du fil conducteur électrique également soumise à des variations de température.7. Device according to any one of claims 1 to 6, characterized in that the heat-sealed end piece is electrically insulating, waterproof in the entire temperature range of use of the friction lining and mechanically resis- both the forces resulting from the expansion of the core of the electrically conductive wire also subjected to temperature variations.
8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé par le fait que la surface latérale externe de l'embout comporte des moyens de retenue dans un orifice prévu pour son insertion dans la garniture de friction. 8. Device according to any one of claims 1 to 7, characterized in that the external lateral surface of the end piece comprises retaining means in an orifice provided for its insertion in the friction lining.
9. Procédé de thermosoudage d'un embout d'un dispositif de détection d'usure de garniture de friction selon l'une quelconque des revendications 1 à 8, caractérisé par le fait qu'il consiste à insérer le fil conducteur électrique (30) dans l'embout (1, 2, 3) et à appliquer l'embout contre un outillage chaud (11) pour provoquer la fusion simultanée de l'embout et de la gaine (32) du fil conducteur électrique (30).9. A method of heat-sealing a tip of a friction lining wear detection device according to any one of claims 1 to 8, characterized in that it consists in inserting the electric conducting wire (30) in the nozzle (1, 2, 3) and to apply the tip against a hot tool (11) to cause the simultaneous fusion of the tip and the sheath (32) of the electric conductor wire (30).
10. Procédé selon la revendication 9, caractérisé par le fait qu'on applique l'embout (1) contre l'outillage chaud (11) en le déplaçant axialement dans un orifice tronconique (29) de cet outillage.10. Method according to claim 9, characterized in that the tip is applied (1) against the hot tool (11) by moving it axially in a frustoconical orifice (29) of this tool.
11. Procédé selon la revendication 9, caractérisé par le fait qu'on applique l'embout en le plaçant entre deux blocs (14, 15) constituant l'outillage (11) et qu'on réunit les deux blocs l'un contre l'autre. 11. Method according to claim 9, characterized in that the tip is applied by placing it between two blocks (14, 15) constituting the tool (11) and that the two blocks are joined one against the 'other.
PCT/FR2000/001581 1999-06-08 2000-06-08 Heat-bonded end piece and method for making same WO2000075526A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PL00345827A PL345827A1 (en) 1999-06-08 2000-06-08 Heat-bonded end piece
AU55401/00A AU5540100A (en) 1999-06-08 2000-06-08 Heat-bonded end piece
DE1101042T DE1101042T1 (en) 1999-06-08 2000-06-08 WELDED WEAR SENSOR AND METHOD FOR THE PRODUCTION THEREOF
SK177-2001A SK1772001A3 (en) 1999-06-08 2000-06-08 Heat-bonded end piece and method for making same
EP00940467A EP1101042A1 (en) 1999-06-08 2000-06-08 Heat-bonded end piece

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR99/07186 1999-06-08
FR9907186A FR2795470B1 (en) 1999-06-08 1999-06-08 THERMOSOUDE WEAR END CAP AND METHOD FOR PRODUCING THE SAME

Publications (2)

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WO2000075526A1 true WO2000075526A1 (en) 2000-12-14
WO2000075526A9 WO2000075526A9 (en) 2001-06-07

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PCT/FR2000/001581 WO2000075526A1 (en) 1999-06-08 2000-06-08 Heat-bonded end piece and method for making same

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EP (1) EP1101042A1 (en)
AU (1) AU5540100A (en)
CZ (1) CZ296613B6 (en)
DE (1) DE1101042T1 (en)
ES (1) ES2157188T1 (en)
FR (1) FR2795470B1 (en)
PL (1) PL345827A1 (en)
SK (1) SK1772001A3 (en)
WO (1) WO2000075526A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2835896B1 (en) 2002-02-12 2005-06-10 Delphi Tech Inc DEVICE FOR DETECTING CONTACT BETWEEN TWO BRAKE ELEMENTS OF A DRYING SYSTEM

Citations (6)

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Publication number Priority date Publication date Assignee Title
DE2535265A1 (en) * 1975-08-07 1977-02-24 Bergmann Kabelwerke Ag Vehicle brake wear detector - has insulated cable in brake lining providing electrical signal when worn through
FR2507722A1 (en) * 1981-06-15 1982-12-17 Valeo Vehicle brake wear detecting cable end protection method - by extending insulation beyond end of conductor and plastic welding overhang to form hermetic seal
DE8434767U1 (en) * 1984-11-23 1988-01-21 Bergmann Kabelwerke Ag, 1000 Berlin Und 5290 Wipperfuerth, De
JPH05248464A (en) * 1992-03-09 1993-09-24 Nisshinbo Ind Inc Wear alarming device for friction member
DE4423677A1 (en) * 1993-06-23 1995-01-05 Siemens Ag Single-pin or multi-pin plug with injection-moulded housing
DE19523002A1 (en) * 1995-06-24 1997-01-02 Eilentropp Kg Moisture-proof seal for elongated metal profile with heat-resistant PTFE sleeve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535265A1 (en) * 1975-08-07 1977-02-24 Bergmann Kabelwerke Ag Vehicle brake wear detector - has insulated cable in brake lining providing electrical signal when worn through
FR2507722A1 (en) * 1981-06-15 1982-12-17 Valeo Vehicle brake wear detecting cable end protection method - by extending insulation beyond end of conductor and plastic welding overhang to form hermetic seal
DE8434767U1 (en) * 1984-11-23 1988-01-21 Bergmann Kabelwerke Ag, 1000 Berlin Und 5290 Wipperfuerth, De
JPH05248464A (en) * 1992-03-09 1993-09-24 Nisshinbo Ind Inc Wear alarming device for friction member
DE4423677A1 (en) * 1993-06-23 1995-01-05 Siemens Ag Single-pin or multi-pin plug with injection-moulded housing
DE19523002A1 (en) * 1995-06-24 1997-01-02 Eilentropp Kg Moisture-proof seal for elongated metal profile with heat-resistant PTFE sleeve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 006 (M - 1537) 7 January 1994 (1994-01-07) *

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EP1101042A1 (en) 2001-05-23
ES2157188T1 (en) 2001-08-16
CZ296613B6 (en) 2006-05-17
CZ2001494A3 (en) 2001-07-11
FR2795470B1 (en) 2001-08-10
PL345827A1 (en) 2002-01-14
FR2795470A1 (en) 2000-12-29
AU5540100A (en) 2000-12-28
SK1772001A3 (en) 2001-11-06
DE1101042T1 (en) 2002-02-07
WO2000075526A9 (en) 2001-06-07

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