Hybrid multiple disc brake

Details Hybrid multiple disc brake Hybrid multiple disc brake

1999-07-12

2000-04-04

Schwartz, Christopher P.

Brakes

Wheel

Axially movable brake element or housing therefor

188 724, 188 725, F16D 5536

Patent

active

060449357

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a multi-disc braking device for a motor vehicle equipped with at least one wheel rotating about a transverse axis in a direct rotation direction which corresponds to forward travel of the vehicle, this device comprising: wheel and are spaced apart and fixed along the transverse axis, the first disc being closer to the fixing arm than the second disc, and the first and second discs having respective internal faces which face each other, and respective external faces; with the first disc and with the second disc, each pair of pads comprising an internal pad and an external pad pointing respectively towards the internal and external faces of the disc with which this pair of pads interacts; sliding in a first cylinder under the action of a first hydraulic pressure to apply the first external pad against the first disc; a fixed caliper secured to the stator and having an upstream end and a downstream end which are spaced apart in a direction tangential to the rotor and follow one after the other in this order in the direct rotation direction, this fixed caliper straddling the second disc and between its two ends carrying a second internal cylinder and a second external cylinder in which there slide respectively, under the action of a second hydraulic pressure, a second internal piston and a second external piston which are respectively capable of applying the second internal pad and second external pad against the second disc; stator.


BACKGROUND OF THE INVENTION

Braking devices of this type are known in the prior art, and illustrated, for example, by Patent Document FR-2,314,399.
In general, brakes with multiple discs are above all known for their application in heavy goods vehicles or in utility vehicles.
Their application in lightweight vehicles or touring vehicles by contrast poses an acute problem of compactness, for which the invention proposes to provide a novel solution.


SUMMARY OF THE INVENTION

To this end, the braking device of the invention, which in other respects is in accordance with the definition given in the preamble above, is essentially characterized in that the brake-application means further comprise: a sliding caliper having an upstream end and a downstream end which are spaced apart in a direction tangential to the rotor and follow one after the other in this order in the direct rotation direction, this sliding caliper carrying the first cylinder between its two ends, straddling the first disc and having a tip arranged between the two discs, the first external pad, the first disc and the first internal pad thus being clamped between the first piston and the tip of the sliding caliper; fixed upstream and downstream guiding means secured to the stator, and moving upstream and downstream guiding means respectively secured to the upstream and downstream ends of the sliding caliper, the moving upstream and downstream guiding means being mounted respectively so that they can slide with respect to the fixed upstream and downstream guiding means in order to allow the sliding caliper to slide with respect to the stator.
The compactness of this device can be further improved by making provision for the tip of the sliding caliper to comprise two parts separated by an empty space and for the second internal cylinder to be arranged in this empty space.
It is furthermore advantageous to produce the rotor in at least two parts, one of which includes the first disc and the other of which includes the second disc, it thus being possible in particular for the two discs to be made of different materials.
To optimize the operation of this device in arduous service conditions, it may also be desirable for the rotor, which is shaped like a hub between the first and second discs, to be pierced with holes for ventilating the internal faces of the discs.
Although the axes of symmetry of the first cylinder and of the second cylinders may be coincident, it may also be preferable for the axis of symmetry of the first cylinder to be further forward, in the direct rotation directi

REFERENCES:
patent: 4234061 (1980-11-01), Margetts et al.
patent: 4529067 (1985-07-01), Scott
patent: 4576255 (1986-03-01), Mery et al.
patent: 4598799 (1986-07-01), Thioux
patent: 4605103 (1986-08-01), Carre et al.
patent: 4823920 (1989-04-01), Evans
patent: 4865160 (1989-09-01), Casey

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