Brakes – Elements – Cooling and lubricating
Patent
1993-05-04
1996-01-30
Oberleitner, Robert J.
Brakes
Elements
Cooling and lubricating
F16D 6500
Patent
active
054874530
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a thermal protection device which can be used especially for protecting a disk- or drum-brake boot and composed of a support and a thermal screen, the latter comprising a plate pierced through by an orifice in order to present an outer edge and an inner edge, which plate consists of an elastically deformable material not subject to buckling and is held in place on the support by means of at least one first bearing surface on which it exerts, by its inner edge, a force resulting from its elastic deformation, said device comprising additional bearing means supplying the plate with a second bearing surface and enabling this plate to exert on the first and second bearing surfaces forces respectively oriented in opposite directions, the inner edge of the plate being cut out so as to present a plurality of tabs and the support comprising a cylindrical portion which supplies its periphery, or the vicinity of the latter, with a first bearing surface essentially reduced to a circle.
A device of this type is described, for example in document FR-A-2,516,189, in which the support is constituted by one of the pistons which actuate the plate elements of a disk brake, this prior patent illustrating the benefit of thermal protection devices in this type of application.
This device of the prior art, designed essentially for automotive vehicles, suffers from a certain weakness as regards the mechanical retention of the thermal screen, which renders its use more precarious under extreme conditions pertaining to subjected impacts, deformations and vibrations, such as, for example, those encountered in braking systems for heavy road vehicles.
In this context, the object of the invention is to provide an improved thermal protection device which, although not very expensive and permitting easy and rapid mounting, leads to a particularly strong mechanical retention of the thermal screen on the support, on the brake piston for example.
For this purpose, the device of the invention is essentially characterized in that the second bearing surface comprises a plurality of points of the support which are located in a plane or in the vicinity of a plane containing the first bearing surface, but which are separated from the latter towards the outside of the cylindrical portion along a radial direction of the latter.
For example, the second bearing surface comprises at least one portion of an axial face of a second cylindrical portion of the support, contiguous with the first, and the first and second cylindrical portions are joined together forming a groove whose edge common to these portions constitutes the first bearing surface.
Preferably, the invention is finally characterized in that the axial face of the second cylindrical portion of the support is, except in the location of the second bearing surface, hollowed out so as to produce a cavity, in that the plate, in the vicinity of its inner edge, is deformed out of its plane along two folds of opposite concavities in order to form an annular flange, in that said flange is engaged in the cavity without touching the bottom of it and in that the second bearing surface comprises at least one portion of the periphery of the axial face of the second cylindrical portion.
The invention will now be described by way of example with reference to the accompanying drawing in which
FIG. 1 is a sectional view of a device in accordance with the invention;
FIG. 2 is a front view of a thermal screen which can be used for the invention; and
FIG. 3 is a side view of the same thermal screen.
The thermal protection device of the invention essentially comprises a thermal screen 1 capable of fitting onto a support 2, such as a disk-brake piston, in order to protect from radiation 3, emitted by an intense heat source, all the sensitive elements (not shown) located behind this screen (to the right of the screen 1 in FIGS. 1 and 4).
The thermal screen comprises an essentially plane plate pierced through by a central orifice 1a (FIG. 2) so as to present an outer edge 1b and an
REFERENCES:
patent: 4401012 (1983-08-01), Emmett
patent: 4537289 (1985-08-01), VonGrunberg et al.
patent: 4582180 (1986-04-01), Lauterwasser et al.
AlliedSignal Europe Services Techniques
McCormick Jr. Leo H.
Oberleitner Robert J.
Palguta Larry J.
Schwartz Chris
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