Pad and disc brake using it

Details Pad and disc brake using it Pad and disc brake using it

1995-08-10

1998-01-13

Oberleitner, Robert J.

Brakes

Wheel

Axially movable brake element or housing therefor

188 7337, 188 7336, 188 7335, F16B 6509

Patent

active

057069166

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a braking device for a motor vehicle including at least one pad having two substantially flat faces, the first of which is partially covered, in a central region, with a friction material, this pad further including, on either side of this central region, two lateral ears, each having a relatively large width, in a first direction substantially perpendicular to the second direction joining these ears, the central region being connected to the two ears by respective connection zones having a relatively small width in the first direction so that outside of the connection zone each ear has a periphery which is greater than the width of this zone.
Devices in accordance with this definition, which encompasses a certain number of disc brakes, are well known in the prior art, as shown, for example, by document U.S. Pat. No. 4,044,864.
A very long-standing problem posed in disc brakes, particularly those which use pads of the type identified above, is that of returning the caliper to its position of rest after the brake has been actuated.
Indeed, it often happens that the pad facing the opposite face of the disc from that towards which the piston is pointing rubs on the disc even when the brake is not actuated, and wears prematurely, whilst unduly slowing the vehicle down.
The invention falls within this context, and its object is to propose a braking device which, although being a simple structure, solves the problem of returning the caliper to its position of rest as soon as the brake is released.
To this end, the brake of the invention, which moreover conforms to the preamble above, is essentially characterized in that each pad ear carries, on its second face at least, a lateral pad spring which is connected to this ear by its central part and which overhangs the periphery of this ear at least at two points which are spaced apart from one another along this periphery.
Preferably, the braking device comprises first and second friction pads of the type described previously, and is characterized in that it further comprises: two brake elements which can move with respect to each other, one of which is a caliper straddling a brake disc, and the other of which is a carrier fixed to the vehicle; clamping means comprising a cylinder bearing on the caliper and having, facing a first of the two faces of the disc, an opening closed by a piston; and guide means allowing the caliper to slide with respect to the carrier when the clamping means are actuated, the first and second friction pads pointing respectively towards the first and second faces of the disc, being trapped between the piston and the caliper, and moved in a third direction by actuation of the clamping means in order to be applied to the disc, and in that the ears of at least one of the pads are set into respective housings of the carrier, each of which extends in the third direction and has an opening pointing in the second direction and of size less than that of the width of the ear which it receives.
For example, it is possible to make provision for the cylinder to be engaged in a ring secured to the carrier, and with respect to which the cylinder can slide under the effect of a braking force.
The caliper may then be fastened removably to the second pad in order to be secured to the latter in the first direction, radially with respect to the disc, the ears of the second pad, preferably of circular shape, being engaged in the said housings in the carrier.
In order to secure the second pad and the caliper to one another, the latter may have a slit extending in the third direction, the second pad having at least one projection passing through this slit, and a central spring fastened to this projection bearing on one edge of the slit.
Under these conditions it is possible to make provision for the caliper to rest freely on the ring.
Preferably, each lateral pad spring essentially assumes the shape of a star including at least three branches, and this star-shaped spring is riveted at its centre to the pad by means of a rivet ha

REFERENCES:
patent: 3980160 (1976-09-01), Hoffmann
patent: 4609077 (1986-09-01), Nakatsuhara
patent: 4662482 (1987-05-01), Bass
patent: 5284228 (1994-02-01), Weiler
patent: 5609228 (1997-03-01), Le Deit

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