Brakes – Elements – Brake wheels
Patent
1998-03-06
2000-10-24
Oberleitner, Robert J.
Brakes
Elements
Brake wheels
188 18A, 192107R, F16D 6510, B60T 106
Patent
active
061352470
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a wheel hub and brake disc arrangement for a vehicle wheel comprising a wheel hub rotatably mounted on a part of an shaft, which has a part with an external cross section profile formed with alternating teeth and grooves with inclined flanks, and a brake disc, carried by the wheel hub on said part, which has a concentric opening which is formed with corresponding teeth and grooves which are so adapted to the teeth and grooves of the hub that the brake disc is locked against rotation on the hub and there is a slip fitting existing between the disc and the hub.
DESCRIPTION OF THE RELATED ART
Brake discs for disc brakes for heavy vehicles have earlier been fixed on the hubs in the main by being screwed tight onto a circular flange on the hub. This arrangement causes problems because a rigid connection between the disc and the hub at the very high maximum braking moments, which can reach the order of 2000 kpm in the heaviest class of load-carrying vehicles, can cause deformations of the disc because of the powerful heating which is the consequence of the high brake forces which are the case here.
A preferred alternative instead of the rigid connection between the disc and the hub is therefore, as stated in the introduction, to join the disc with the hub through the use of interlocking shapes. With is construction the possibility of avoiding deformation as a consequence of the heating up due to braking is improved at the same time as it is possible to control the heat transfer between the brake disc and the hub dependent on the shape of the hub and the actual construction of the teeth and grooves which are adapted to each other.
A wheel and brake disc arrangement of the last mentioned type which greatly reduces the above stated negative effects has earlier been suggested for use in the heaviest class of load-carrying vehicles. Thus, SE 9200202-1 (469 655), from the same inventor, shows and describes an arrangement of type given in the preamble in which the number of grooves and teeth can be as many as thirty. Stress relief holes with radially inwardly directed slits ensure an esualisation of the tangential stress in the disc which is cooled by means of ventilation openings formed in it. A circular channel is formed in the hub radially inwardly of the teeth in order to lengthen the heat transfer path through the hub material.
With this known arrangement not only is the advantage achieved that during heating the disc can expand radially without twisting or warping but also the considerable advantage that the radial bursting forces on the disc as well as the torsional and bending strains on the profiles can be held to an acceptable level at the same time as the risk of being wedged fast is eliminated even at the very large brake forces which can occur in the heaviest class of vehicles. At the same time it is possible to limit the heat transfer to the bearings by means of the circular channel and the ventilation channels formed in the brake disc.
Because according to the known arrangement the openings for the stress relief holes the slits and the openings of the ventilation channels, in order to achieve the intended effect, are formed in the brake disc in a part which in the radial direction extends from its central opening and a distance into its friction surface, the friction linings will lie over these openings which means increased lining wear and collecting of brake dust and dirt in the openings which require regular cleaning and in extreme cases can cause a breakdown.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to bring about an arrangement with improved interlocking shape connection between hub and brake disc which is optimal with respect to the bursting forces and torsional resp, bending strains on the cross-sectional profiles, at the same time as the stresses caused by the temperature distribution in the disc can be brought down to an acceptable level and heat transfer to the hub can be limited in a simpier and
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Bodin Jan-Olof
Dagh Ingemar
AB Volvo
King Bradley
Oberleitner Robert J.
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