Brakes – Elements – Brake wheels
Patent
1994-09-14
1996-10-29
Graham, Matthew C.
Brakes
Elements
Brake wheels
188264AA, B60B 2702, F16D 6512
Patent
active
055688462
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a wheel hub and brake disc arrangement for a vehicle wheel, comprising a hub rotatably carried on a shaft portion and presenting an outwardly facing region of non-circular cross-section, and a brake disc which is carried by said region of the hub, said brake disc having a central hole, the shape of which is adapted to the shape of said non-circular cross-section to thereby provide a mutually non-rotatable attachment of the brake disc to the hub.
Brake discs for disc brakes have previously predominantly been attached to their hubs in either of two ways, namely either by being manufactured as an integral part of the hub or by being securely screwed to a circular flange on the hub. The former method is essentially restricted to brakes for lighter vehicles, whilst the latter is also suitable for medium-sized trucks, for example trucks up to 16 tonnes in weight. For the heaviest class of truck, drum brakes have until now been almost exclusively used due i.e. to the extremely high braking torque (around 2000 kpm) in combination with the brake shoes which apply the braking effect creating problems. More specifically, these problems are due to, on the one hand, the intense heating up of the brake disc as a result of the high braking force causing the disc to warp or upset because of its rigid attachment to the hub to thereby affect its alignment with the brake caliper and, on the other hand, the force applied to the disc causing warping of the stub axle assembly, which also affects the alignment of the brake disc with respect to the brake caliper. Both of these factors contribute to large stresses in the disc and wear to both the disc and brake pads. With conventional attachment of the brake disc to a wheel axle, it is possible that with heavier vehicles the deformation of the wheel axle which can arise during cornering can result in such misalignment between the disc and brake caliper that wear occurs.
A wheel hub and brake disc arrangement of the type according to the preamble of claim 1, which at least partially addresses some of the above-mentioned negative effects of a rigid attachment between the brake disc and the hub when subjected to intense heating, has previously been proposed for e.g. use in competition, i.e. for light vehicles. An arrangement of this type is shown and described in DE-OS 1 800 161 in which a three or four cornered transmission ring is attached to the hub, with the corners engaging in corresponding recesses in the central hole of the brake disc. In addition to the advantage that, during heating, the disc can expand radially without warping, the arrangement also allows the disc to be quickly replaced, a not insignificant advantage for competition use.
Starting out from previously known interlocking connections between a wheel hub and a brake disc, the object of the present invention can generally be said to develop a hub and brake disc arrangement which can replace previously employed drum brakes for the heaviest class of vehicles.
More precisely, the object is to provide an interlocking connection between a hub and brake disc which has a shape on the non-circular cross-section of the support surface of the hub and around the central hole of the disc which is optimal as regards the fracture forces exerted on the disc and the shear and bending stresses on the cross-section region, at the same time that the risk of the disc jamming on the hub is eliminated.
This is achieved in accordance with the present invention by a wheel hub and brake disc arrangement of the earlier mentioned type which is characterized in that said non-circular region of the hub comprises closely spaced V-shaped ridges and troughs, and in that the central hole of the brake disc is provided with corresponding V-shaped troughs and ridges which are so adapted in relation to the ridges and troughs on the hub that a slip fit between the hub and disc is achieved. It has been shown that by providing the non-circular cross-section region with closely spaced V-shaped ridges and troughs, the lev
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patent: 4280609 (1981-07-01), Cruise
patent: 5101953 (1992-04-01), Payvar
Bodin Jan-Olof
Dagh Ingemar
AB Volvo
Graham Matthew C.
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