Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1993-11-04
1997-03-11
Ballato, Josie
Brakes
Wheel
Axially movable brake element or housing therefor
188205A, F16D 55226, F16D 65097
Patent
active
056092288
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the field of disk-brakes for motor vehicles, and its subject is more particularly an assembly made up of a friction member and of a spring for equipping such disk-brakes.
BACKGROUND OF THE INVENTION
Disk-brakes have been known for a long time and conventionally comprise friction members received via their circumferential ends with anchoring and sliding on a member withstanding the braking torque, whether the latter consists of a fixed caliper, a sliding caliper or even a fixed support member, control means being associated in order to stress the friction member into braking contact with a corresponding face of the brake disk.
It is also known, for example from the document FR-A-2,330,916, to give the circumferential ends of the friction members a rounded surface capable of interacting with anchoring and sliding with a corresponding rounded surface defined on the torque-withstanding member, one of these rounded surfaces being concave and the other rounded surface being convex.
For a brake of this type, the document EP-B-0,002,399 makes provision for a friction member whose circumferential ends are received with sliding and anchoring on a torque-withstanding member, control means being associated with the latter in order to stress the friction member into braking contact with a corresponding face of a brake disk, at least a first of the circumferential ends of the friction member comprising at least one rounded surface capable of interacting with sliding and anchoring with a corresponding rounded surface defined on the torque-withstanding member, one of the rounded surfaces being concave, and the other rounded surface being convex, the radius of curvature of the convex surface being less than that of the concave surface, the friction member being received with a predetermined circumferential clearance in the torque-withstanding member, so that the friction member may occupy a first and a second extreme circumferential position corresponding to the friction member being anchored onto the torque-withstanding member via its first circumferential end or via the second circumferential end respectively, according to the direction of rotation of the disk, elastic means being provided in order to stress the friction member away from the first extreme circumferential position and into permanent contact with the rounded surface defined on the torque-withstanding member.
Such an arrangement has the object of forcing the friction member to move along an opposite surface defined on the torque-withstanding member each time the brake is actuated, so as to avoid the formation of deposits and automatically to scour the contacting rounded surfaces of the friction member and of the torque-withstanding member.
SUMMARY OF THE INVENTION
Such a solution gives complete satisfaction in normal use of the vehicle thus equipped. However, when the wheel of the vehicle associated with a brake of this type is subjected to considerable vertical accelerations due, for example, to a poor road surface, the inertia of the friction member may become greater than the stress exerted by the elastic means, and the friction member may then move within the limits of the predetermined circumferential clearance. When, under these conditions, the brake is actuated, the friction member is not in the circumferential position in which it should be and the braking action has the result of violently throwing the friction member onto the torque-withstanding member. There therefore results considerable banging, which, apart from generating intense noise, may impede the operation of the brake and detract from its durability.
The object of the present invention is therefore to provide, in a disk-brake of the type recalled above, an assembly of a friction member and of a spring which does not exhibit these drawbacks.
To this end, according to the present invention, the spring is produced from a metal wire and comprises an action part interacting with an opening made in the convex rounded part and a reaction part interacting
REFERENCES:
patent: 3403756 (1968-10-01), Thirion
patent: 4410069 (1983-10-01), Schreiner et al.
Gerard Jean Louis
Le Deit Gerard
AlliedSignal Europe Service Techniques
Ballato Josie
McCormick Jr. Leo H.
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