Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1994-06-25
1997-03-11
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 726, F16D 6516
Patent
active
056092270
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a brake-application device comprising: two plates having opposite faces which are substantially parallel to each other, at least one of these plates being capable of being driven in a rotational movement about an axis perpendicular to these faces; a plurality of guide cavities formed in at least one of these plates at a distance from the axis; a plurality of corresponding balls engaged in the cavities and held tightly between the two plates; and a support disk placed in between the plates and pierced with circular housings in which the balls are maintained in fixed relative angular positions, this disk having, on at least one of its faces, a central protuberance engaged in a corresponding axial bore made in the plate arranged opposite this face.
Devices of this type are well known in the prior art and are used, for example, as shown in U.S. Pat. No. 5,038,895 for the control device for the application of a hand brake in motor vehicles.
A problem commonly encountered in the manufacture of these devices, which comprise numerous components, is that their assembly entails each of these components being fitted in a painstaking way under very poor accessibility conditions.
Such is the context for the present invention which proposes to improve substantially the manufacture of these devices.
To this end, the device of the invention is essentially characterized in that the support disk includes, on each of its faces, elastic means capable of ensuring axial securing of this support disk to the plate arranged opposite this face.
For example, it is possible to ensure that the support disk has a central protuberance on each of its faces, in that the plates have respective axial bores opposite these protuberances, and that each of these protuberances is engaged by force in one of these bores, this arrangement allowing the subassembly consisting of the plates, the balls and disk to be assembled under excellent accessibility conditions, it then being possible for this subassembly to be inserted into the assembly intended to receive it in a single operation.
Furthermore, and according to a preferred embodiment of the invention, at least one of the protuberances has the shape of an expandable elastic clip .
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a sectional view of a disk brake employing a brake-application device with a rotating plate according to the invention
FIG. 2 is a partial exploded sectional view of such a brake-application device with a rotating plate;
FIG. 3 is a sectional view similar to FIG. 2 that illustrates the brake-application device with a rotating plate after it has been assembled;
FIG. 4 is a top view of the support disk;
FIG. 5 is a side view of the support disk; and
FIG. 6 is an enlarged sectional view of the centering protuberances of the support disk.
FIG. 1 illustrates a disk brake of known type comprising a cap 1, a sliding caliper 2 equipped with frictional members 3, and a brake motor 4.
The brake motor itself comprises a piston 5 which can be actuated either hydraulically or mechanically via a brake-application device 6 with plates moved by a lever 7.
Such a brake-application device, which can be seen more clearly in FIGS. 2 and 3, comprises first and second plates 8 and 9 which are substantially parallel to each other and grip balls such as 10, 11 and 12 between their opposite front faces 8a and 9a.
These plates can be rotated relative to each other by at least one of them being driven in rotation about an axis 13 perpendicular to the faces 8a and 9a of these plates.
The balls 10, 11 and 12 are housed in identical guide cavities such as 80, 81, 90 and 91 formed in at least one of the plates and are thus gripped between the latter.
However, these balls are also engaged in respective circular housings 140, 141 and 142 of a support disk 14 placed in between the plates and by virtue of which these balls are held in fixed relative angular positions.
The support disk 14 has a central prot
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patent: 3991859 (1976-11-01), Coulter et al.
patent: 4550810 (1985-11-01), Price et al.
patent: 5038895 (1991-08-01), Evans
patent: 5263554 (1993-11-01), Mery
patent: 5487452 (1996-01-01), Moinard et al.
AlliedSignal Europe Services Techniques
Butler Douglas C.
McCormick Jr. Leo H.
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