FR2562187A1 - WEAR INDICATOR, PREFERABLY FOR DISC BRAKE PADS - Google Patents

Abstract

WEAR INDICATOR 4, PREFERRED FOR DISC BRAKE PADS, ON WHICH AN ELECTRIC CONDUCTOR UNDER PLASTIC SHEATH 6 HAS AN END 7 TO BE INSERTED IN A BORE OF THE FRICTION LINING 3 OF A BRAKE SHOE AND TO BE FIXED BY GLUING IN THE BALLING OF THE FRICTION LINING, CHARACTERIZED IN THAT THE PLASTIC SHEATH 6 AT THE END OF THE CONDUCTOR 7 HAS A PROFILING AT THE CIRCUMFERENCE, PREFERENCE A TRANSVERSAL PROFILING.

Description

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  anchor acting more or less from the rear and em-

  fishing the end of the conductor to come off the

friction lining.

  Seen in the axial direction, the profiling can-

  wind be interrupted by intermediate zones to

  smooth circumferential surface, these intermediate zones

  res with reduced outer diameter used to receive a

more glue.

  According to another characteristic of the invention, the profiling of the plastic sheath can be designed so as to be formed by grooves extending in the axial direction and interrupted in the transverse direction, which results in effective axial anchoring, D ' on the other hand, the profiling can be constituted by local recesses distributed at the circumference, for example recesses

  in the form of a bucket or also rectangular recesses

  laires. The invention is explained below using

  exemplary embodiments shown in the drawing.

  Figs. I and 2 show a front view and a side view of a brake shoe equipped with a wear indicator according to the invention and in schematic form. Figs. 3 to 7b are on a larger scale schematic views of different profiling models

  for the end of the plastic sheath to stick.

  The brake shoe 1 of Figs. 1 and 2 comprises a support plate 2 provided with a friction lining 3, in which is placed the wear indicator 4 fixed by gluing. The wear indicator consists of an electrical conductor 5 (Fig. 7b), an insulating outer sheath 6 made of plastic with, on one side, an end 7 inserted and glued into the friction lining 3 and, the other

side, an electrical plug 8.

  In the embodiment of FIG. 3, the

  profiling of the plastic sheath of the plug-in end

  ble 7 consists of grooves, grooves 9 transverse

  or others in the form of a ring, the bottom surface of the grooves

  ges can be planned on a slope. On the form of reali-

  sation of FIG. 4, the circular groove 10 of the gai-

  plastic at the end of the conductor has a line in

propeller shape.

  In the example of FIG. 5, two helical grooves are provided, these grooves are traced

opposite and intersect at 11.

  In the embodiment of the profiling of the plastic sheath at the end of the conductor according to the

  Fig. 6, the transverse profiling 9 of the circular grooves

  res is interrupted by intermediate zones 12 to dia-

  reduced meter. In this case, the circular faces inter-

  broken may have a smooth bottom surface.

  In the embodiment of Figs. 7a and 7b, the bonding is anchored between the plastic sheath at the end of the conductor, and the bore located in the friction lining 3, by local recesses 13

  distributed around the circumference. In this example, the

  local elements have a rectangular shape in the sense

  axial. Fig. 7b shows the radial distribution of the evi-

  dements local to the circumference of the sheath.

  It is a good idea to manufacture the profiling of the ends of the wear indicator sheath using embossing plates, while making

  simultaneously the tip of the plug-shaped part.

  The results obtained in practice have shown that the li-

  load mite allowed by bonding was significantly

  improved by the profiling of the sheath, a mechanical anchoring

  nique in addition to adhesion by bonding. We ob-

  thus holds very stable junctions, between the extremi-

  conductor tee and friction lining.

Claims (5)

  1. Wear indicator (4), preferably for disc brake pads, on which an electrical conductor (5) in plastic sheath (6) has a   end (7) to be introduced into a bore of the lining   friction type (3) of a brake shoe and to be fixed by gluing in the bore of the friction lining,   characterized in that the plastic sheath (6) of the end   mity of the conductor (7) has at the circumference a   profiling, preferably transverse profiling (9-13).   2. Wear indicator according to claim 1, characterized in that the profiling of the plastic sheath has the appearance of grooves, grooves or the like (9, 10, 11)   ring-shaped, helical-shaped or helical-shaped these intersecting.   3. Wear indicator according to claim 1 or 2, characterized in that the profiling, seen in the axial direction, are interrupted by intermediate zones (12)   with smooth circumference and reduced outside diameter.   4. Wear indicator according to claim 1,   characterized in that the profiling consists of a hollow   local elements (13) distributed at the circumference, in shape rectangular or round.   5. Wear indicator according to claim 4, characterized in that the profiling of the plastic sheath is formed by grooves extending in the axial direction   and interrupted in the transverse direction (Fig. 7a, 7b).