Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1996-10-17
1998-11-24
Poon, Peter M.
Brakes
Wheel
Axially movable brake element or housing therefor
267 30, F16D 5500
Patent
active
058395474
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates generally to an application arrangement for a disc brake and more specifically wherein the brake lining is guided and supported by a brake lining housing. The object of the present application is also a brake lining constructed according to the teaching of the invention.
In conventional application arrangements for a disc brake, a brake lining compartment is normally provided for accommodating a brake lining which can be displaced by the application arrangement and which has two lateral guide surfaces which extend in the application direction and on which the brake lining is displaceably guided by its two lateral edges.
When the application arrangement is actuated for braking, the brake lining is displaced by it in the direction of the brake disc and finally rests by means of its friction surface against the corresponding lateral surface of the brake disc. Because of the brake friction forces, the brake lining is moved toward the downstream-side or outlet-side guide surface of the brake lining compartment and is then supported on this guide surface. In contrast, in the non-applied or brake-free condition, the brake lining rests comparatively loosely in the brake lining compartment.
As soon as, during the application of the disc brake in the initial phase of the braking operation, the brake lining rests on the brake disc and, in this case, finally, as mentioned above, touches the downstream-side guide surface of the brake lining compartment, the rotational moving force of the brake disc is transmitted to this downstream-side support of the brake lining and causes a friction force there which counteracts the application force. During the further application of the disc brake, this friction force must therefore additionally be overcome by the application arrangement.
In the most frequently used disc brakes in which the lining compartments of the above-mentioned type are normally also used, a so-called floating caliper is provided as the caliper. When the brake lining is in contact, because of the reaction forces acting in the axial direction, the caliper is displaced with the brake disc in the opposite direction and, in the process presses another brake lining situated on the opposite side also against the brake disc. Since this opposite brake lining is guided in a substantially identically constructed lining compartment, an equally large friction force occurs on its downstream-side guide surface. This additionally stresses the application arrangement.
The above-mentioned friction forces on the respective downstream-side guide surface of the lining compartment therefore have the disadvantage that the application arrangement must apply an increased braking force, whereby the overall efficiency of the disc brake is considerably reduced. In practice, the required braking force is increased between 10% and 30%.
However, another, even more serious disadvantage of these undesirable friction forces is that, as a result, the so-called circumferential diagonal wear is caused. The reason is that conventional application arrangements introduce their application force centrally into the brake lining while the respective friction force of the brake linings operates only on one side. This result in an overall asymmetrical force distribution in the brake lining so that this brake lining is pressed against the brake disc with a non-uniform force. Therefore the brake lining is worn more for a long period of time on its upstream or inlet-side area where the applied application force is larger. Thus, a wear profile which extends diagonally in the circumferential direction results which correspondingly reduces the useful life of the brake lining.
From German Patent Application DE 22 30 949 A1, an application device for a disc brake is known in which it is suggested to reduce the disadvantageous friction forces on the downstream-side guide surface of the lining compartment by a leaf spring which is stiff in the lateral direction and which is fastened at least
REFERENCES:
patent: 2920884 (1960-01-01), Rowland et al.
patent: 3730509 (1973-05-01), Jorn
patent: 4364455 (1982-12-01), Oshima
patent: 4629037 (1986-12-01), Madzgalla et al.
Knorr Bremse Systeme Fur Nutzfahrzeuge GmbH
Poon Peter M.
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