Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1993-07-23
1996-02-27
Ballato, Josie
Brakes
Wheel
Axially movable brake element or housing therefor
188196F, F16D 552265, F16B 1902, E05C 502
Patent
active
054941393
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for connecting a first and a second part, comprising first and second housings of common axis formed respectively in these first and second parts, as also a key inserted axially into the first housing with a relatively small clearance and into the second housing with a relatively large clearance.
Devices of this type have been used for a very long time in engineering and in all fields of industry.
One particular example thereof is given by Patent U.S. Pat. No. 4,936,422 which relates to a disk-brake with sliding caliper and with single post, and which illustrates the preferred field of application of the present invention.
When it is a question of locking two parts to one another such as the yoke and the sliding caliper of a disk-brake, it is in fact necessary, because of production tolerances, to provide for the key to enter one of the two parts with a relatively large clearance, failing which assembly risks being impossible.
Nevertheless in certain applications, and in particular in the case of brakes also assembled and subjected to extreme conditions of use, the clearance between the key and the second part, therefore between the two parts, is productive of noise and creates a risk of premature wear resulting, at substantial accelerations in alternate directions, from a hammering of the two parts against one another.
The object of the present invention is precisely to avoid this process and to eliminate the effects for which it is responsible.
SUMMARY OF THE INVENTION
To this end, the device of the invention is essentially characterized in that the second housing and the key adopting at least partially the form of cylinders with non-circular bases each of which has different minimal and maximal diameters, the diameters of the second housing being greater than the corresponding diameters of the key and the maximal diameter of the latter being greater than the minimal diameter of the second housing, and in that this device further comprises a retaining member, resting against one of the two parts and exerting on the key a resilient torsional torque about said common axis, tending to align the maximal diameter of the key and the minimal diameter of the second housing.
In the case where the first and second parts are constituted respectively by the yoke and the caliper of a sliding caliper disk-brake, the retaining member is preferably constituted by a wire spring secured to the key and to the yoke respectively at first and second attachment points spaced apart from one another by a portion of length of this wire, and this portion of length extends at least partially in a direction different from that of said common axis so as to be subjected to a flexion during a sliding of the caliper resulting from a braking action, and so as thus to be capable of bringing the latter back at the end of this action.
According to one embodiment which is easy to use, the first attachment point is obtained by inserting the wire spring into a transverse bore made in the key.
If the wire spring is angled at the exit from the transverse bore at such an angle that the sliding of the caliper produces a rotation of the wire spring in the bore, then the wire spring is advantageously pressed onto the yoke at a point of rotation situated, along the length of this wire, between the first and second attachment points, and the second attachment point is situated apart from the plane formed by said common axis and said point of rotation.
DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a plan view of a sliding caliper disk-brake using a device according to the invention;
FIG. 2 is a front view of the brake of FIG. 1;
FIG. 3 is a detail view in cross-section along line III--III of FIG. 1; and
FIG. 4 is a view similar to that of FIG. 3, drawn to an enlarged scale and along a slightly different sectional plane, and showing a key of cross-section also slightly different.
REFERENCES:
patent: 3268034 (1966-08-01), Burnett
patent: 4119180 (1978-10-01), Horie
patent: 4936422 (1990-06-01), Mery et al.
Gerard Jean Louis
Hulliger Claude
Le Deit Gerard
Ballato Josie
Bendix Europe Services Techniques
McCormick Jr. Leo H.
Palguta Larry J.
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