Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1999-02-26
2000-10-24
Graham, Matthew C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 711, 188 7337, 188 7339, F16D 6514
Patent
active
061352462
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a disc brake for a motor vehicle.
More specifically, the present invention relates to a disc brake of the type which comprise: a disc which has an inboard face and an outboard face, this disc rotating about a transverse axis in a direct sense of rotation when the vehicle is travelling forward; a carrier comprising an upstream branch and a downstream branch straddling the disc and secured to a common base which is fixed to the vehicle facing the inboard face of the disc, the downstream branch following on from the upstream branch in the direct sense of rotation of the disc, and each branch having an inboard housing and an outboard housing which are situated one on each side of the disc; a caliper straddling the disc and mounted so that it can slide relative to the carrier in a transverse direction parallel to the transverse axis, this caliper comprising a jaw pointing towards the outboard face of the disc, and a cylinder closed by a piston and pointing towards the inboard face of the disc; first and second guide means provided respectively on the carrier and on the caliper, one of the guide means consisting of a first bore, and the other consisting of a first pin sliding in the first bore; and a pair of friction pads, this pair being formed of an inboard pad and of an outboard pad placed respectively, in the transverse direction, between the piston and the inboard face of the disc, and between the outboard face of the disc and the jaw of the caliper, the inboard pad having an upstream end and a downstream end which are mounted so that they can slide in the respective inboard housings of the upstream and downstream branches, and the outboard pad having an upstream end and a downstream end which are mounted so that they can slide in the respective outboard housings of the upstream and downstream branches, the inboard and outboard pads bearing, between their respective ends, respective friction linings pointing towards the inboard and outboard faces of the disc and by means of which each pad is urged by the disc in the direct sense of rotation in the event of braking while the vehicle is travelling forwards, a first and a second at least of the inboard and outboard housings of the upstream and downstream branches forming stops for the respective ends of the pads, these stops being capable of opposing a movement of the inboard and outboard pads in the direct sense of rotation.
Disc brakes of this type are well known in the prior art, as shown, for example, in Patent Documents PCT/FR96/00615, PCT/FR94/00174, and EP-0,694,133.
One of the many problems which arise when designing disc brakes lies in the difficulty of absorbing the dragging forces transmitted to the pads by the disc, without the carrier deformations which necessarily result from this causing resistance that opposes the satisfactory sliding of the caliper relative to the carrier, as such a resistance itself generates abnormal wear and unevenness of the pads, risks of brake seizure, increase in brake-fluid absorption, noise, etc.
SUMMARY OF THE INVENTION
The invention falls within this context and its purpose is to propose a disc brake capable of deforming without appreciable functional anomaly.
To this end, the brake of the invention which in other respects conforms to the above preamble, is essentially characterized in that when the pads are urged in the direct sense of rotation, just a first of the inboard and outboard housings of the upstream branch forms an upstream stop for the upstream end of just a first one of the inboard and outboard pads, while just a second one of the inboard and outboard housings of the downstream branch forms a downstream stop for the downstream end of just a second one of the inboard and outboard pads, in that the upstream branch has a first stiffness for a force applied to the upstream stop, in that the downstream branch has a second stiffness for a force applied to the downstream stop, and in that the ratio between the first and second stiffnesses is between 0.80 and 1.25.
In other
REFERENCES:
patent: 4219106 (1980-08-01), Lupertz et al.
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patent: 4775034 (1988-10-01), Pachner et al.
patent: 5036932 (1991-08-01), Schonenberger
patent: 5111914 (1992-05-01), Thiel et al.
patent: 5234080 (1993-08-01), Pantale
patent: 5411120 (1995-05-01), Null
patent: 5551537 (1996-09-01), Mery et al.
patent: 5588508 (1996-12-01), Le Deit
patent: 6047795 (2000-04-01), Kobayashi et al.
Bosch Systemes de Freinage
Comstock Warren
Graham Matthew C.
McCormick, Jr. Leo H
Williams Thomas J.
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