Brakes – Wheel – Axially movable brake element or housing therefor
Reexamination Certificate
1999-04-05
2001-06-26
Butler, Douglas C. (Department: 3613)
Brakes
Wheel
Axially movable brake element or housing therefor
C188S073390, C188S073310
Reexamination Certificate
active
06250440
ABSTRACT:
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 comprises: 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 facing towards the outboard face of the disc, and a cylinder facing towards the inboard face of the disc and closed by a piston; guide means provided on the carrier and on the caliper and comprising a bore and a pin sliding in the bore; and a pair of friction pads, this pair being formed of an inboard pad and 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 respective inboard housings in 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 carrying, between their respective ends, respective friction linings facing 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 forward.
BACKGROUND OF THE INVENTION
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 drag 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 and uneven wear of the pads, risks of brake seizure, increases in brake-fluid absorption, noise, etc.
SUMMARY OF THE INVENTION
The invention falls within this context and its object is to propose a disc brake capable of absorbing the dragging forces transmitted to the pads by the disc by converting them into shear forces.
To this end, the brake of the invention which in other respects conforms to the above preamble, is essentially characterized in that the pin is a single pin and lies on a mid-plane of the caliper, in that the downstream branch of the carrier and the jaw of the caliper have first and second respective contact surfaces capable of coming to bear one on the other in a first oblique plane, in that the downstream branch of the carrier and at least one of the inboard and outboard pads have third and fourth respective contact surfaces capable of coming to bear one on the other in a second oblique plane, and in that the first and second oblique planes form a non-zero angle between them.
The disc brake of the invention may also advantageously comprise a spring bearing on the outboard pad and on the jaw of the caliper and exerting an elastic torque tending to make the caliper turn in the direct sense of rotation relative to the outboard pad.
In one possible embodiment of the invention, the upstream end of at least one of the inboard and outboard pads is attached to the upstream branch of the carrier.
As a preference, the downstream branch of the carrier has a pair of first contact surfaces forming a dihedron of mutual contact between this downstream branch and the jaw, and a pair of third contact surfaces forming a dihedron of mutual contact between this downstream branch and the first pad.
In this way, the jaw of the caliper may have, facing the downstream branch of the carrier, a pair of second contact surfaces, each of which is capable of coming to bear on the dihedron of mutual contact between the downstream branch of the carrier and the jaw.
Likewise, the downstream end of the first pad may have a pair of fourth contact surfaces, each of which is capable of coming to bear on the dihedron of mutual contact between the downstream branch of the carrier and this first pad.
Finally, it may also be advantageous to contrive for the angle formed between the first and second oblique planes to be at least equal to 45 degrees.
Further features and advantages of the invention will emerge clearly from the description thereof given hereafter by way of non-limiting indication with reference to the appended drawings.
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Boisseau Jean-Pierre
Mery Jean-Claude
Butler Douglas C.
Constock Warren
McCormick Jr. Leo H.
Robert & Bosch GmbH
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