Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1993-11-04
1996-05-14
Oberleitner, Robert J.
Brakes
Wheel
Axially movable brake element or housing therefor
188 7344, F16D 6540
Patent
active
055159516
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a disk brake, comprising: a yoke; a carrier securely fastened to the yoke; a caliper securely fastened to a brake motor, having a concave arch directed towards the inside of the yoke, mounted to pivot about the carrier with respect to the yoke, and capable, when the brake motor is actuated, of sliding along the carrier in a first direction; first and second housings of common axis parallel to the carrier and distant from the latter, these housings being respectively formed in the yoke and in the caliper; a guide pin inserted axially into the two housings with, in at least one of the housings, a clearance allowing residual pivoting of the caliper with respect to the yoke; and a filiform spring exerting, between the caliper and the yoke, an elastic spacing force opposing this residual pivoting.
Brakes of this type have been used for many years on a great number of vehicles, and the U.S. Pat. No. 4,936,422 gives an example of a disk brake with a sliding caliper and single carrier which forms the context of application of the present invention.
A problem traditionally encountered in the design and production of this type of brake is that of returning the caliper to its rest position after actuation.
Indeed, if the caliper does not return to its rest position after having applied the friction members to the disk, the friction members may continue to rub on the disk, even in the absence of a significant brake torque and as a result noise and wear can be generated.
It is therefore necessary to provide means capable of returning the caliper back into a desired rest position after actuation, this necessity is difficult to satisfy, particularly owing to the fact that this rest position varies with the state of wear of the friction members.
In this context, the object of the present invention is to provide means which are simple and inexpensive but nevertheless capable to ensure the return of the caliper to a desired rest position.
To this end, the disk brake of the invention is essentially characterized in that a spring is wound round the guide pin and has a first strand bearing on the yoke and a second strand bearing on the arch of the caliper. The second strand bears on the arch via an end distant from the common axis and points in a direction or actuation direction of the caliper substantially opposite the first direction.
Preferably, the end of the second strand of the spring is partially directed in a direction substantially opposite the end in which the concavity of the arch is directed.
Moreover, the first strand of the spring advantageously connects two zones of the length of the spring in which the springs is wound on the guide pin, so as to ensure good stability of the spring on this guide pin.
Other features and advantages of the invention will emerge clearly from the description hereinafter provided while viewing the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a brake in accordance with the invention; and
FIG. 2 is a front view of this brake observed in the direction of the arrow II of FIG. 1.
The disk brake represented in these figures comprises a yoke 1 and a caliper 2 mounted so as to slide on this yoke by means of an axial carrier 3.
A hydraulic brake motor 4 securely fastened to the caliper 2 is capable of applying to a disk (not shown), securely fastened to a wheel of a vehicle to be braked, two friction members (not shown) mounted on the yoke by means of support plates bearing on stops 1a, 1b.
The yoke 1 and the caliper 2, which are capable of pivoting with respect to each other about the carrier 3 forming the hinge, are rotationally securely fastened to each other by means of a guide pin 5 engaged along an axis 6 in at least one housing 7 in the yoke 1 and a housing 8 in the caliper 2.
Whilst the clearance of the guide pin 5 in the first housing 7 is infimal, the clearance of this guide pin in the housing 8 of the caliper is relatively large so as in particular to take up the manufacturing tolerances of the brake and its deform
REFERENCES:
patent: 4225017 (1980-09-01), Op Den Camp
patent: 4552253 (1985-11-01), Burgdorf et al.
patent: 4567968 (1986-02-01), Denree
patent: 4905796 (1990-03-01), Schonenberger et al.
patent: 4936422 (1990-06-01), Mery et al.
Gerard Jean Louis
Le Deit Gerard
AlliedSignal Europe Services Techniques
McCormick Jr. Leo H.
Oberleitner Robert J.
Palguta Larry J.
Rutherford Kevin D.
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