Disc brake with an annular metal frame holding part-circular pads
AssigneeDunlop Limited
InventorFrederick Sidney Dowell
Life of this patent
Estimating the term…
Abstract
An annular brake disc takes the form of a metal frame having circumferentially-distributed, part-circular apertures in which part-circular pads of high heat-absorption material are inserted. Chordal gaps of the apertures open radially of the frame and through these the pads can be inserted and then rotated into a final position where they are held by a dowel. In arrangements in which the part-circular apertures intersect each pad is cut away on one side to receive the adjacent pad except one which is cut away on both sides and another which is not cut away but which is the only pad held in its final position by a dowel.
Claims12
A brake disc comprising an annular metal frame having means defining a plurality of circumferentially distributed channels of segmented-circular shape, each having a gap corresponding to a chord of the circle, each said gap opening radially of the frame, and a plurality of friction members of a material more brittle and of higher specific heat than the frame, each member being shaped at least approximately as a segmented circle and fitting into an associated one of the channels by insertion through the gap and being subsequently rotated while in the channel;
- the width of the member on a diametral line disecting its chordal edge being less than the width of the gap of the associated channel whereby the member can be inserted in or removed from the channel through the gap when the chordal edge of the member extend radially of the frame;
- releasable means for preventing rotation of the member after being positioned in its associated channel so that when the member is in an operative position with its chordal edge extending generally circumferentially of the frame it is held in place.
A brake disc comprising an annular metal frame having means defining a plurality of circumferentially distributed channels shaped as part-circular openings in the outer periphery of the frame and bounded by an undercut recess opening to each axial face of the frame, each channel having a gap corresponding to a chord of the circle, each said gap opening radially of the frame, and a plurality of friction members of a material more brittle and of higher specific heat than the frame, each member being shaped at least approximately as a segmented circle and fitting into an associated one of the channels by insertion through the gap and being subsequently rotated while in the channel;
- the width of the member on a diametral line bisecting its chordal edge being less than the width of the gap of the associted channel whereby the member can be inserted in or removed from the channel through the gap when the chordal edge of the member extends radially of the frame;
- releasable means for preventing rotation of the member after being positioned in its associated channel so that when the member is in an operative position with its chordal edge extending generally circumferentially of the frame it is held in place by said undercut recess opening.
A brake disc comprising an annular metal frame having means defining a plurality of circumferentially distributed channels of segmented-circular shape, each having a gap corresponding to a chord of the circle which opens radially of the frame, and a plurality of friction members of a material more brittle and of higher specific heat than the frame, each member being shaped at least approximately as a segmented circle and fitting an associated one of the channels to be rotatable therein, the width of the member on a diametral line bisecting its chordal edge being less than the width of the gap of the associated channel whereby the member can be inserted in or removed from the channel through the gap when the chordal edge of the member extends radially of the frame and there being additionally provided releasable means for preventing rotation of each member in the associated channel when the member is in an operative position with its chordal edge extending generally circumferentially of the frame, and wherein the channels are positioned on the frame so that the circles on which they lie intersect, the distance between the centres of the circles on which two adjacent channels lie being less than the diameter of each circle, and the part-circular portion of the periphery of each member is cut away to receive the portion of an adjacent member which intersects the circle on which it lies, the arrangement being such that each member is prevented from rotating by a next adjacent member but the members can be inserted in sequence around the circumference of the frame by rotating each toward the cut-away portion of a next one already mounted, one only of the members having portions cut out of its opposite sides so that in its operative position it does not overlap either of the circles on which the adjacent, intersecting channels like, while another one only of the members has a full part-circular periphery so that in the operative position it will extend into both of the next adjacent channels.
Dependencies are inferred from the claim text.