Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1994-03-07
1996-12-31
Poon, Peter M.
Brakes
Wheel
Axially movable brake element or housing therefor
188 731, F16D 5500
Patent
active
055885080
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a disk brake for a motor vehicle, comprising a first support which is fixed with respect to the vehicle, a second support shaped into a caliper and slidable with respect to the first one, pads each of which is held by one of the supports so as to resist the drive forces to which it is subjected in the event of braking, and a brake motor associated with the second support and capable of being actuated so as to give rise to the application of said pads onto the disk according to a movement which is substantially perpendicular to the latter, each pad having a central friction zone where the resultant of the drive forces is applied and two lateral ends, the first of which is offset with respect to the central zone in the direction of rotation of the disk and at least the second of which has a drive profile, the support of this pad having two housings, the second of which presents a retaining profile interacting with this drive profile in a fastening zone in order to retain this pad when it is stressed in the direction of rotation of the disk by the drive forces, and at least the first end of each pad having an external contact surface suitable for abutting, in a bearing zone, against a corresponding internal contact surface of a first bearing surface provided on the first housing of the support for this pad.
Disk brakes of this type have been known for a long time in the prior art, and an example thereof is given in U.S. Pat. No. 4,044,864.
From a theoretical point of view, these brakes a priori have the advantage of allowing the pad, on which the driving loads are applied in the event of braking, to transmit these loads to the support which holds it in place, that is to say generally to the first support called a "carrier", through each of the two ends of this pad, one of which thus works in traction, and the other in bearing.
From an actual point of view, the situation is, however, very different and much less advantageous, the simultaneous nature of the traction and thrust loads practically never being obtained.
Indeed, in known brakes of the aforementioned type, the distribution of the traction and thrust loads depends extremely critically both on the dimensions of the pad and of the support which receives it, these dimensions themselves being subjected not only to manufacturing tolerances but also to variable deformations of the brake under the effect of more or less intense braking loads, and/or more or less significant temperature rises.
In this context, the object of the invention is to propose a sliding-caliper disk brake in which the transmission to the pad support of the loads received by the latter may be produced at both ends of the pad without being subjected, in a hindering fashion, to the influence of undesirable parameters such as those which have just been expounded.
To this end, the disk brake of the invention is essentially characterized in that each pad is stressed with respect to its support and towards the bearing zone by an elastic force having at least one first component pointing along the radius of the disk which passes through the central friction zone, in that each pad has a relative freedom of rotation in its plane about the fastening zone, in that the internal and external contact surfaces together define, in the bearing zone, a tangent in a plane containing the pad, in which a straight line connecting the fastening zone to the bearing zone defines, together with said tangent, an angle inside which the central friction zone is located, and in that this angle is obtuse and less than a flat angle.
According to a simple embodiment of the invention, at least one of the two contact surfaces has a rounded profile, and these surfaces have different radii of curvature at least in the bearing zone.
One of the two contact surfaces may therefore be essentially concave and the other convex, each one having rounded profile and each concave contact surface having a radius of curvature which is greater than the radius of curvature of the corresponding convex sur
REFERENCES:
patent: 4567968 (1986-02-01), Denree
AlliedSignal Europe Services Technique
McCormick Jr. Leo H.
Poon Peter M.
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