Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1995-06-23
1996-12-10
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188106F, 188 729, 188 718, 188196BA, F16D 6520, F16D 6552, F16D 6516, F16D 6556
Patent
active
055822738
DESCRIPTION:
BRIEF SUMMARY
This application is filed under 35 U.S.C. 371 in order to enter into the U.S. national stage under PCT based upon the international application filed Jan. 27, 1994 as PCT/DE94/00061.
SUMMARY AND BACKGROUND OF THE INVENTION
The present invention relates to a compressed-air-operated disc brake, in general and more particularly for use in commercial road vehicles.
Compressed-air-operated or pneumatic disc brakes of the above-mentioned type are known, for example, from German Patent Documents DE-OS 37 16 202, DE-OS 40 32 885 as well as DE-OS 42 12 384 which is not a prior publication. In the case of these known disc brakes, a caliper reaches around the brake disc, which caliper is disposed so that it can be displaced in the axial direction. On one side of the caliper, a compressed-air-operated application device is arranged during whose operation a brake shoe situated on this side of the brake disc is pressed against the friction surface of the brake disc. Whereupon, the caliper is displaced in the opposite direction because of the reaction forces and, as a result, a brake shoe situated on the opposite side also presses against the brake disc.
In the case of these known disc brakes, the application device has a rotary lever as an actuating element which is disposed so that it can be swivelled about an axis of rotation extending in parallel to the plane of the brake disc. On its side facing the brake disc, the rotary lever rests by means of an eccentric approximately in the longitudinal center on a transverse element which extends in parallel to the axis of rotation. The traverse element is displaceably guided with respect to the brake disc. Two adjusting spindles, which are provided with an external thread, are adjustably screwed in a parallel arrangement in a respective assigned internal thread of the transverse member. Because of the use of two adjusting spindles, such an application device is also called a "two-spindle" application device.
The two adjusting spindles each include of a pressure member disposed on their brake-disc-side end upon the brake shoe which is disposed on the application side in the caliper so that the caliper can be displaced with respect to the brake disc. By at least one adjusting device which is coupled in an axially displaceable but non-rotatable manner with one of the two adjusting spindles and, during each actuation of the rotary lever, acts by way of a sliding clutch on the respective adjusting spindle, the ventilating play, which changes because of the wear of the lining, maintains its correct desired value in a constant manner. The rotation of the mentioned adjusting spindle which is caused by the adjusting device in the case of a lining wear, is transmitted by a synchronizing device to the other adjusting spindle such a that this adjusting spindle is rotated by the same angle and therefore reduces its distance from the brake disc by precisely the same distance.
In the simplest case, only one actuator is arranged in the above-mentioned second adjusting spindle, which actuator couples this adjusting spindle in a non-rotatable manner with the synchronizing device. The actuator may be constructed, for example, of a gear wheel which meshes in an internal toothing of the adjusting spindle and which is coupled with the synchronizing device by a shaft. However, for the second adjusting spindle, a separate adjusting device may also be provided. In this case, twice as much adjusting forces is achievable, but with correspondingly higher manufacturing costs. Also when two adjusting devices are used, a synchronizing device will still be necessary because an exactly synchronous method of operation of both adjusters will still be absolutely required for ensuring a uniform abrasion of the brake lining and prevent the occurrence of a circumferential diagonal wear, that is, the non-uniform wear of the brake linings in the tangential or circumferential direction of the brake disc.
In the currently most customary embodiment, the synchronizing device of the known application devices consists
REFERENCES:
patent: 5343984 (1994-09-01), Bieker et al.
patent: 5353896 (1994-10-01), Baumgartner et al.
patent: 5379867 (1995-01-01), Macke et al.
patent: 5400875 (1995-03-01), Anthony et al.
patent: 5433298 (1995-07-01), Antony et al.
patent: 5439078 (1995-08-01), Baumgartner et al.
patent: 5449052 (1995-09-01), Macke et al.
Baumgartner Hans
Bicker Dieter
Butler Douglas C.
Knorr-Bremse Systeme Fuer Nutzfahrzeuge
LandOfFree
Compressed-air disc brake does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compressed-air disc brake, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compressed-air disc brake will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-419181