Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1993-02-08
1994-10-11
Oberleitner, Robert J.
Brakes
Wheel
Axially movable brake element or housing therefor
188196D, 188196V, F16D 6556, F16D 6516
Patent
active
053538960
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a disk brake for motor vehicles, in particular street vehicles, with a caliper which reaches over a brake disk and one side of which has a clamping mechanism with a cam lever which can be swivelled around an axis of rotation extending parallel to the plane of the brake disk and whose cam is coupled in the direction of movement at substantially right angles to the plane of the brake disk to at least one adjusting spindle. The adjusting spindle extends at substantially right angles to the plane of the brake disk and is screwed adjustably to the cam or a spacer which can be moved by the cam and against whose brake disk-sided end is braced a brake lining. The brake lining is movable relative to the caliper transversely to the brake disk. To adjust the releasing play, a rotating drive actuated by a swivel stroke of the cam lever is provided for the adjusting spindle.
BACKGROUND OF THE INVENTION
Disk brakes of this type are well known in the prior art. Usually there is only one adjusting spindle on which the cam, arranged symmetrically relative to its axial direction, acts and which can be screwed down by means of any kind of drive during an excessive brake stroke. However, disk brakes with two adjusting spindles are also already known from DE-OS 36 10 569 and 37 16 202; these are screwed to the ends of a traverse extending parallel to the plane of the brake disk; the cams engage with the longitudinal center of the traverse which can be moved at substantially right angles to the plane. These disk brakes are equipped with a synchromesh device for the two adjusting spindles, which device may have a toothed belt or chain drive which couples the adjusting spindles relatively non-rotatably directly or by means of gear wheels. In these known disk brakes, the play is adjusted by converting the swivel movements of the cam lever into movements of the toothed belt, a process that is carried out by means of a friction drive from the cam lever to a deflecting roller for the toothed belt or by means of a pawl-like spring mounted on the cam lever and interacting with the toothed belt. Thus, in the two known designs, the toothed belt and/or the synchromesh device must transfer the forces for the simultaneous resetting of both adjusting spindles, whereby the toothed belt and/or the synchromesh device can be severely stressed.
SUMMARY OF THE INVENTION
The object of the invention is to design a disk brake of the aforementioned kind with simple means in such a manner that with reliable and functional reset behavior the rotating drive for the adjusting spindle is arranged optimally for assembly and installation and can be designed as a compact module, wherein, when a synchromesh gear is present, the synchromesh gear and/or the toothed belt is/are stressed by only moderate forces during reset operations, in particular is/are relieved of its/their function as a reset control member.
This problem is solved according to the invention by arranging the rotating drive essentially in an axial open recess which faces away from the brake disk and belongs to the adjusting spindle, and by coupling an output member of the rotating drive to the adjusting spindle so as to be relatively non-rotatable, but axially movable. If two adjusting spindles and one traverse are present, only one of the adjusting spindles can be coupled, according to another feature of the invention, directly to a rotating drive which can be driven by the cam lever by way of a swivel drive. The synchromesh device serves as the rotating drive for the other adjusting spindle.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings show the essential parts of the preferred embodiments for disk brakes designed according to the invention.
FIG. 1 shows the clamping mechanism in a caliper, which is cut open, for a disk brake with two adjusting spindles coupled by means of a synchromesh device.
FIG. 2 shows a first embodiment.
FIG. 3 shows a second embodiment for a rotating drive of an adjusting spindle.
FIG. 4 shows a detail of FIG.
REFERENCES:
patent: 4351419 (1982-09-01), Garrett et al.
patent: 4374551 (1983-02-01), Birkenbach et al.
patent: 4399894 (1983-08-01), Tribe
Baumgartner Hans
Hirschler Klaus
Iraschko Johann
Schullerus Otto
Knorr-Bremse Systeme feur Nutzfahrzuege
Oberleitner Robert J.
Rutherford Kevin D.
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