Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1997-03-28
1999-08-10
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 732, 188218XL, 188250B, 188250G, 188217, 188366, 188 58, 188250E, 188 7337, F16D 65092, B61H 500
Patent
active
059344180
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a brake lining and more specifically to brake lining for partial lining disc brakes.
Large-surface brake linings, for example, rail vehicle disc brakes, have no even approximately constant surface pressure on their friction surface during high-energy braking operations. This is, among others, the result of a non-uniform introduction of force from the brake application device, for example, when dovetail guides are used. It also results from accidentally warmer areas of the surfaces of the lining and the brake disc, because of the thermal expansion of the friction materials, bulge out of their surfaces, in which case these areas are more stressed and, as the braking progresses, therefore become hotter than the adjacent zones. The result of such "hot spots" on the disc and the lining are premature hot cracks on the disc and lining damage because of thermal overloading. Particularly, with respect to hard lining materials (resin-bound materials, metallic sintered materials), the above-mentioned occurrence is extremely pronounced.
For avoiding the above-mentioning disadvantages--mainly when sintered materials are used--brake linings were used which have elastically disposed individual elements (German Patent Document DE-OS 43 01 006). However, in the case of such arrangements, essentially two disadvantages are found: The surface pressures on the individual elements are still not constant; they are a function of the compression corresponding to the respective surface constant of the elastic bedding of the individual elements. In addition, the lining expenses on the whole are very high and therefore result in high costs. The price is four to six times higher than organically bound, one-piece linings.
In the case of a known brake lining of this type (CA-2120392), support plates supporting lining elements are swivellably arranged on a support body in the form of a support plate. The lining elements are in each case rigidly connected with the support plate which, in turn, is riveted to the support plate. Three lining elements respectively are situated in the three corners of such a support plate which has the shape of a triangle. The rivets, which are used for connecting the support plate with the carrying plate, are in each case placed in the center area of the three legs of the triangular support plate so that the free corners of the support plate can carry out pitching movements with respect to the carrying plate to a limited extent. For this purpose, the support plates are provided with weakenings in their center. Because of such a geometry of the positioning of the lining elements and of the fastening of the support plate on the actual carrying plate, the swivel angle as well as the swivel direction of the lining elements is given within a narrow scope; that is, the swivel axis of each lining element remains generally constant. Despite the weakenings situated in the center of the support plates, a certain interdependence of the movements of one lining element with respect to the next one is to be accepted because swivel movements in one corner can be transferred beyond the center of the support plate to the area of the respective adjoining two lining elements. The result are undesirable oblique positions of the lining elements, that is, reactions of a lining element with respect to a track on the brake disc are partially also transmitted to the closest lining elements. In addition, by means of the lining elements, no equal-surface grinding pattern can be achieved because the swivel angles or rotating angles are fixed. The result are "hot spots" on the brake disc because resilient restoring forces, as increased reaction forces, can lead to temperature increases on the disc.
Based on the above, it is an object of the invention to develop a brake lining of the above-mentioned type by constructionally simple devices such that the surface pressure on the friction surface of the brake disc can be rendered more uniform. A clearly defined distribution of
REFERENCES:
patent: 2791294 (1957-05-01), Bachman et al.
patent: 3198294 (1965-08-01), Stacy
patent: 3297117 (1967-01-01), Freholm
patent: 4076106 (1978-02-01), Bermingham et al.
patent: 4441592 (1984-04-01), Everett
patent: 4501347 (1985-02-01), Cerny et al.
patent: 4535874 (1985-08-01), Pollinger et al.
patent: 4611692 (1986-09-01), Everett
patent: 4901823 (1990-02-01), Chang
patent: 5538108 (1996-07-01), Russo
Butler Douglas C.
Knorr-Bremse System Fur Schienenfahrzeuge GmbH
LandOfFree
Brake lining for partial-lining disc brakes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Brake lining for partial-lining disc brakes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brake lining for partial-lining disc brakes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1110574