FR2531168A3 - DRUM BRAKE LININGS - Google Patents

Abstract

LINING 1 FOR DRUM BRAKE SHOES IS CONSTITUTED BY A RECTANGULAR STRIP OF A FRICTION MATERIAL WHOSE BASE 2 FACE OPPOSED TO THAT INTENDED TO BE FIXED FOR USE TO THE SHOE CONSISTS OF A SERIES OF PARALLEL ELLESINURES3 AND INCLINED IN RELATION TO ITS SIDES. THE PAD MAKES AVOID THE FORMATION OF A WATER VEHICLE BETWEEN PADDING1 AND DRUM, FOLLOWING WETTING OF THE PAD IN USE, AND THE RESULTING REDUCTION OF THE BRAKING EFFECT.

Description

Drum brake linings "

  The present invention relates to cash linings.

  tion for m Drum brake sets of the type constituted by

  rectangular strips of friction material.

  These fillings traditionally include two sides

  basic planes, one of which is intended to be fixed by a

  lage or riveting To the jaw while the opposite face is intended to act on the internal face of the drum during braking. A serious drawback of the linings according to the traditional technique is linked to the drawbacks resulting from their possible wetting. Under these conditions, a continuous veil of water can in fact form on the braking surface of the

  linings which, when braking, can reduce the friction

  tion between jaws and drum and thereby the braking effect. The object of the present invention is to produce a lining which, on the one hand does not give rise, when it is used, to a substantial reduction of 18 braking forces in the presence of water, originating from the formation of a veil of water between the lining and the drum, and on the other hand does not give rise to an increase in manufacturing costs compared

with classic garnishes.

  To achieve the above-mentioned goal, the present inven.

  tion relates to a packing of the aforementioned type, in which the base face which is opposite to that intended to be fixed to the jaw, comprises a series of parallel grooves between

  them and inclined with respect to its c 8 tees.

  In use, these grooves create a channel system

  readings which allow, when the vehicle is traveling

  sence of water, to discharge the water which would tend to form a veil between the lining and the drum On the single figure of the attached drawing is shown, in

  perspective and as an example, a trim according to lfinven-

tion.

  The reference (1) designates a lining made of

  friction for drum brakes in the form of a rec-

  tangular having a thickness between 3 and 6 mm.

  a The lining comprises a smooth base face intended to be fixed, by gluing or riveting, to a jaw of a drum brake and a face (2) intended to come into contact with the drum during braking The face (2) includes a series of grooves (3) of rectangular section, parallel

  lela between them and inclined to its sides.

  Preferably, the grooves (3) are inclined at an angle of 45 relative to the sides of the base face. The depth of the pipes is approximately half

the thickness of the filling.

  The profile of the grooves can also be different

  that of the rectangular shape illustrated by way of example

pleo

Claims (2)

CLAIMS -   I Drum brake shoe lining in the form   a rectangular strip (1) of a friction material, character-   in that its base face (2) which is opposite to that intended for 6 e to be fixed in the street of its use to the jaw comprises a series of grooves (3) parallel to each other and inclined with respect to its c 8 tees O   2 brake lining, characterized in that 1 inclination   sound of the grooves (3) is about 45, 1 O 3 A fitting according to claim 1, characterized in that the depth of the grooves (3) is equal to about the   half the thickness of the filling.