Brakes – Elements – Brake wheels
Patent
1991-11-18
1993-03-02
Butler, Douglas C.
Brakes
Elements
Brake wheels
188 18A, 188218A, 188264G, 188251A, 301 3562, F16D 6512
Patent
active
051901242
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
This invention relates to a floating type automotive brake disc.
BACKGROUND OF THE TECHNOLOGY
In the floating type brake disc, a disc hub and a friction disc, formed separately, are combined with each other with a very small clearance therebetween. Accordingly, this type of brake disc enjoys an advantage that its braking action does not fluctuate since the friction disc undergoes uniform heat expansion when exposed to the frictional heat generated by braking operation to suffer no strain on the braking surface thereof and further the disc is not constrained by the disc hub.
A prior art floating type brake disc is disclosed, for example, in Japanese Provisional Utility Model Publication No. 46539/1989. In the disclosed brake disc, a plurality of connecting members are formed on the disk hub and friction disc, respectively, and the thickness of each opposing pair of connecting members are reduced to 1/2 so that the thickness of the two connecting members may be 1/2 the thickness of the disc hub and that of the friction disc, respectively. Connection holes having different inner diameters are also formed through these connecting members, respectively, and each pair of connecting members are combined with each other in such a way that the reduced portions may be overlapped and that the connecting holes thereof may communicate to each other. A stepped connecting pin is inserted through the combined connecting holes of the connecting members, and after a washer is fitted to the point of the connecting pin, the point of the pin is caulked. Since the disc hub and the friction disc are thus bound elastically between the head of the connecting pin and the washer, the head of the connecting pin and the washer deflect if the friction disc undergoes heat expansion and can cope with the fluctuation or expansion in the thickness of the friction disc.
However, the above structure suffers a problem that the skill of an expert is required for the caulking operation since the friction disc may not be supported evenly unless the connecting pins are caulked with an equal power, and that it is troublesome to remove the connecting pins when the friction disc is replaced.
DISCLOSURE OF THE INVENTION
It is an object of this invention to provide a brake disc in which a friction disc can easily be connected to the disc hub.
This invention is directed to a brake disc comprising: a disc hub which rotates as the wheels rotate; a friction disc to be fixed to the disc hub; a collar inserted through connecting holes formed through the disc hub and the friction disc, respectively; and a connecting means for fixing the friction disc to the disc hub, consisting of a connecting bolt penetrating through the collar and a nut to be fitted to said bolt; wherein said collar has an annular ridge (large diameter portion) on the circumference thereof at substantially the middle for defining a clearance between the disc hub and the friction disc; either said friction disc or said disc hub is supported between one lateral side of the annular ridge and the head of the connecting bolt or the nut; and the length of the shaft protruding from the other lateral side of the annular ridge is greater than the thickness of the remaining one of the friction disc and the disc hub.
In this construction, either the friction disc or the disc hub is supported between the annular ridge of the collar and the head of the bolt or the nut and secured on the collar, so that the remaining one of the friction disc and the disc hub can cope with the fluctuation or increase in thickness of the friction disc caused by heat expansion, since the length of the shaft protruding from the other lateral side of the annular ridge is greater than the thickness of the remaining one of the disc hub and the friction plate, causing no strain on the braking surface of the friction disc, in turn, no fluctuation in the braking action.
On the other hand, since the friction disc is combined with the disc hub via such bolt-and-nut connecting means, the friction disc can
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patent: 4102443 (1978-07-01), Kohler et al.
patent: 4280598 (1981-07-01), Pollinger
patent: 4742948 (1988-05-01), Fisher et al.
patent: 4848521 (1989-07-01), Izumine
Butler Douglas C.
Nissin Kogyo Kabushiki Kaisha
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