Joints and connections – Interconnected flanges or shoulders – Axially bolted or riveted
Patent
1998-05-21
2000-10-31
Browne, Lynne H.
Joints and connections
Interconnected flanges or shoulders
Axially bolted or riveted
403370, 403336, 188206R, 188 18A, F16D 6512
Patent
active
061392154
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates generally to a disk-hub connection and more specifically to disc-hub connectors for utility vehicle disc brakes.
According to the state of the art, disk-hub connections for disk brakes of motor vehicles are constructed either in one piece--that is, the disk and the hub set consist, for example, of one casting--or--see, for example, German Patent Document DE 34 41 304 concerning the above-mentioned type--of two pieces. Because of expansion and crack problems as the result of an intensive heating of the disks during the braking, the one-piece constructions are mainly suitable for lighter motor vehicles. With an increasing trend to use disk brakes also in heavy utility vehicles, the demand exists for a disk construction which can also securely withstand the high stresses occurring during a braking of heavy utility vehicles. Because of a lower tendency to form cracks, the two-piece variant has recently been favored. First attempts to adapt the technology shown in German Patent Document DE 34 41 304 (having the problem of poor ventilation and cooling) to the utility vehicle field are known, for example, from Patent Document WO93/14947. However, the disk shown there can be implemented with respect to manufacturing techniques only at relatively high cost.
In addition to the high requirements concerning the stability with respect to cracks, it is necessary in the case of disk-hub connections for utility vehicles to get by with the scarce available space. In the ideal case, a two-piece construction should not require more installation space than the corresponding one-piece variant.
From German Patent Document DE 34 36 729, as the closest state of the art, a disk-hub connection is known for connecting a brake disk with a hub, particularly for cranes of different types, whose brake disk is provided in the inner peripheral region with semicircular bores or recesses so that "support elements" are formed between the bores which project radially to the inside. On its outer periphery, the hub is also provided with semicircular recesses so that the hub has "cams" on it outer peripheral region which project radially to the outside. In this case, intermediate elements are used for the torque transmission between the hub and the disk as follows: When the hub and the disk are assembled (for example, by shrinking the disk onto the hub), the semicircular recesses of the hub and the disk are in each case situated opposite one another so that circular recesses are formed between the hub and the disk. Sleeves are inserted into these recesses, which sleeves are axially secured by screws and washers. Although it is possible in this manner to partly eliminate excessive strains result from temperature differences between the hub and the disk, the mounting of the disk remains relatively complicated. The solution is also hardly suitable for transmitting the high braking forces occurring in the case of faster utility vehicles.
In contrast to this state of the art, it is an object of the invention to provide a hub-disk connection which ensures a secure force transmission between the hub and the disk and can easily be mounted also in a narrow installation space.
The invention achieves this goal by a disk-hub connection in the case of which the torque transmission between the disk and the hub during braking from a forward drive and a reverse drive is always fully ensured. In the case of which, because of the uncoupling of the disk and the hub, crack formations caused by the heating of the disk during the braking operation are safely prevented. Furthermore, a disk-hub connection is implemented at reasonable cost whose components can be produced also without high-precision manufacturing tolerances and which can be assembled in an easy and rapid fashion. Another advantage of the invention is the fact that it does not increase the installation measurements of the disk-hub complex in comparison to a one-piece variant.
The use of additional elements between the disk and the hub, which
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Bieker Dieter
Kuhne Victor
Browne Lynne H.
Cottingham John R.
Knorr-Bremse System fuer Nutzfahrzeuge GmbH
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