Disk brake equipped with a mechanical actuating device

Details Disk brake equipped with a mechanical actuating device Disk brake equipped with a mechanical actuating device

1996-01-16

1997-12-16

Oberleitner, Robert J.

Brakes

Wheel

Axially movable brake element or housing therefor

188 7955, 188205R, 745024, 74526, 403 13, F16D 5508, F16D 6514

Patent

active

056974752

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to the field of disk brakes in general, of the type of those used to provide braking on motor vehicles.
Such disk brakes in the known fashion include at least one piston sliding in a caliper itself sliding over a stationary support. The piston may be actuated hydraulically for service brake operation, and mechanically for emergency brake or parking brake operation.
Mechanical actuation may, for example, be provided by a mechanical subassembly comprising two substantially parallel plates, a first plate being able to be driven in rotation by an operating lever about an axis perpendicular to its surface, a second plate being stationary in terms of rotation and secured to the piston, the face of at least one of the plates being formed with inclined grooves taking balls for converting the rotational movement of the first plate into an axial translational movement of the second plate, the operating lever being formed with a part for fastening onto the end of a sheathed actuating cable, the sheath of the cable bearing on a sheath end stop which is stationary with respect to the caliper.
Disk brakes equipped with such mechanical actuators are well known in the art, for example from document FR-A-2,638,214. They do, however, have some drawbacks. In fact, series production requires the provision of manufacturing tolerances for the various elements making up the disk brake and the plate-type mechanical actuator.
As a result, during final assembly of the disk brake, the mechanical actuating lever is, at rest, in an angular position which can vary from brake to brake, with respect to the stationary sheath limit stop, across a not insignificant range of values. For example, variations of plus or minus 10 degrees have been observed.
It therefore follows that when the disk brake is installed on the vehicle, the maximum angular excursion of the lever between its position of rest and its extreme position closest to the stationary limit stop itself varies from brake to brake and that in some extreme cases this maximum angular excursion is insufficient for satisfactory mechanical actuation of the disk brake.


SUMMARY OF THE INVENTION

The object of the present invention is therefore to provide a disk brake with a plate-type mechanical actuation device of the type recalled hereinabove, in which the distance between the sheath limit stop, which is stationary with respect to the caliper, and the part for fastening onto the end of the sheathed actuating cable is constant from brake to brake in series production, and regardless of the initial position of the lever, bearing in mind the manufacturing tolerances, by providing means which are simple to employ and inexpensive so as to be compatible with such series production.
To this end, according to the invention, the sheath limit stop is formed on a bracing piece of which the angular position with respect to the lever is determined by the angular position at rest of the lever with respect to the caliper.
As a result, the travel of the actuating cable, and consequently the angular excursion of the operating lever, can be constant from brake to brake and set to the optimum value for the disk brake thus equipped.
According to an advantageous embodiment, the bracing piece includes an arm formed with a tab extending perpendicularly to the arm and forming a first limit stop against which the lever comes to bear in a first position.
For preference, the bracing piece is formed with an oblong slot extending substantially along an arc of a circle centered on the axis of rotation of the lever, and the oblong slot of the bracing piece has passing through it the shank of a screw secured to the caliper, so that the bracing piece can be immobilized in terms of rotation by a nut screwed onto the screw shank.
Other objects, features and advantages of the present invention will emerge more clearly from the description which follows of one embodiment given by way of non-limiting explanation, with reference to the appended drawings.


BRIEF D

REFERENCES:
patent: 4583622 (1986-04-01), Ebbinghaus et al.
patent: 4616518 (1986-10-01), Husser
patent: 4619347 (1986-10-01), Schreiner et al.
patent: 5009292 (1991-04-01), Hoffman, Jr. et al.
patent: 5105682 (1992-04-01), Jung
patent: 5586623 (1996-12-01), Mevy

Affiliated with

Also associated with

Rating

Disk brake equipped with a mechanical actuating device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disk brake equipped with a mechanical actuating device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk brake equipped with a mechanical actuating device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-199061