Brakes – Vehicle – Hub or disk
Patent
1991-08-01
1994-03-08
Oberleitner, Robert J.
Brakes
Vehicle
Hub or disk
188264AA, 188264D, B60T 106, F16D 65853
Patent
active
052918521
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL DOMAIN
The present invention relates to disc brakes, particularly for automotive vehicles.
PRIOR ART
The prior art discloses, particularly by publication GB-A-2 184 801, disc brakes, for a vehicle wheel, of the type comprising, on the one hand, a disc attached to the wheel, coaxial thereto and constituted by a concentric annular part mounted in angular drive relation with the wheel while being axially mobile with respect thereto, such a disc presenting a plurality of radial passageways open at their ends and intended for air cooling and, on the other hand, two brake pads borne by a pad support attached to a fixed hub of the vehicle. These pads are disposed on either side of the disc and provide friction surfaces capable of exerting tighteninq forces on the disc under the action of a control arrangement.
This known type of brake is currently used in automotive vehicles. The disc is generally made of metal and the pads, made of a friction material, are mounted on stirrup elements. During braking, the variation of the kinetic energy of the vehicle is converted into heat. The disc heats up and may attain a high temperature, close to 600.degree. C. It is known that the braking qualities of the materials rapidly degrade at higher temperatures, and this is why, in order to facilitate cooling of the disc by air, the pads generally cover only a sector of the disc. On the other hand, the diameter of the disc is relatively large, so that the friction surfaces of the pads are sufficient. However, with the disc not being totally protected by the pads, a film of water or of oil may, due to splashing, be formed on its. surface. This film considerably deteriorates the qualities of the brake. Moreover, the repeated use of the brake, in particular in the mountains, brings about an excessive heating of the disc and a considerable degradation of the braking capacities of the vehicle.
It is known to use, such as in an aircraft, disc brakes made of a material resistant to high temperature and cooperating with pads made of the same material. Such brakes may be constituted by stacks of rotors and stators constituting a "heat well" of which the heat capacity makes it possible to withstand the energy developed during braking, without it being necessary to seek an in-sense cooling, as an aircraft is braked only upon landing.
A similar constructional technique seems to have been retained by publication FR-AR 211 078 (73-40 996) for the brakes of automotive vehicles. The recommended structure comprises at least one rotating disc with which two annular friction discs may cooperate. Such a structure is similar to a heat well having only slight cooling ability, incompatible with a frequent use of the brake, as is the case of automotive vehicles.
The purpose of the present invention is to provide a brake, particularly for an automotive vehicle, of the type mentioned, which conserves its qualities of braking at high temperatures in which the braking surfaces are protected from the projections of water and oil and in which a very efficient ventilation is ensured.
SUMMARY OF THE INVENTION
The disc brake of the present invention, particularly suitable for use on an automobile is characterized in that: part removably fitted on the wheel hub and bearing the annular part with which it defines axial openings, dimensioned so that its inner face, forming a friction surface, totally covers the adjacent face of the outer part, present a plurality of radial passageways open at their ends, intended for cooling them by air and are covered, over all their surfaces, except for the friction surfaces, with a layer of anti-oxidant paint.
Thanks to this arrangement, the braking pieces are protected from oxidation by said protection product. Only a thin film of air is capable of being located between the friction surfaces of the pads and of the disc, thus limiting the possible oxidation of these surfaces and, consequently, the wear of the pieces upon braking. The temperatures admitted in the pads and the disc may be notably higher than the tem
REFERENCES:
patent: 2655236 (1953-10-01), Bachman
patent: 3121477 (1964-02-01), Maloney et al.
patent: 3400789 (1968-09-01), Mione
patent: 3850267 (1974-11-01), Odier
patent: 3940159 (1976-02-01), Pringle
patent: 3983974 (1976-10-01), Dowell et al.
patent: 4011055 (1977-03-01), Hill et al.
patent: 4790413 (1988-12-01), Meyniev
patent: 4890699 (1990-01-01), Megginson et al.
patent: 4926977 (1990-05-01), Gassiat
Allera Hubert
Prud'Homme Guy
Carbone Industrie
Ligier Sports
Oberleitner Robert J.
Schwartz Chris
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