Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1994-05-20
1997-01-14
Oberleitner, Robert J.
Brakes
Wheel
Axially movable brake element or housing therefor
188 7337, 188 7344, F16D 55227
Patent
active
055930069
DESCRIPTION:
BRIEF SUMMARY
The subject of the present invention is a sliding caliper disk-brake which can equip motor vehicles in particular.
Disk-brakes of this type comprise a stationary support secured to a stationary part of the vehicle, and a caliper sliding on this stationary support and including a brake motor for applying a first friction pad onto one of the faces of a rotating disk secured to a wheel of the vehicle, the caliper applying, by reaction, a second friction pad onto the other face of the disk. The caliper slides with the aid of two axial guide pins, or of one axial guide pin and of an axial spindle, these being fixed onto the caliper or the stationary support and interacting with bores formed in the stationary support or the caliper, respectively.
Current machining machines are capable of producing, in one same component, bores, possibly tapped, which are practically perfectly parallel. However, it is still necessary to provide a manufacturing tolerance as regards the distance between the axes of these bores.
Document U.S. Pat. No. 4,061,209 discloses a disk-brake of the type recalled above, in which, to take account of this manufacturing tolerance, at least one of the bores is oversized, and the guide pin interacting with this bore is stressed into an off-centered position in sliding contact with the wall of this bore by a spring which normally stresses the friction pads in the stationary support.
Such an arrangement therefore imposes a significant clearance of the guide pin in the corresponding bore, so that an elastic sleeve has to be arranged around the guide pin to avoid noise and to damp out the vibrations generated when the disk-brake is actuated. In addition, the guidance of the caliper during this actuation is very imperfect.
Also, document GB-A-2,159,219 disloses a disk-brake of this type, in which the caliper slides on the stationary support by means of two axial guide pins each including a cylindrical sheath and a fixing screw. An assembly element in the form of a gutter with parallel sides straddles the stationary support and includes tapped parts interacting with the threaded parts of the guide pin screws.
The ends of the assembly element form forks interacting with notches formed on the sleeves in order to prevent the sleeves from rotating when the guide pin screws are screwed. The assembly element makes it possible to avoid the eccentric effect during tightening of the guide pin screws, but at the same time it determines the distance between the axes of fixing of the guide pins and does not make it possible to take account of the manufacturing tolerances regarding this distance, and consequently it goes against the axial centering of the guide pin when it is fixed.
Also, document EP-A-0,395,460 discloses a disk-brake of the same type, in which the caliper slides on the stationary support by means of an axial guide pin, and is held in terms of rotation with respect to the support by a locking means of the ball joint type, made up of a spindle, in order to allow misalignment of the caliper with respect to the stationary support when the brake motor is actuated.
The locking spindle includes, at its end penetrating into the bore of the stationary support, a small bearing surface allowing the ball joint effect, and allowing preferential locking in one direction whilst authorizing certain freedom in a perpendicular direction.
The immobilization of the locking spindle in terms of rotation is obtained by a hex-head shape of the end of the spindle, housed in a groove produced in a part of the caliper. This layout has the drawback that the tightening of the screw generates a tangential load on the spindle, which can bring the end of the latter to move in the groove of the caliper and thus go against the desired self-centering effect.
As a consequence, the object of the present invention is to overcome the drawbacks recalled hereinabove by providing a caliper disk-brake comprising a locking spindle, in which the manufacturing or machining tolerances of the bores are taken into account, and of which the means
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Gerard Jean Louis
Le Deit Gerard
AlliedSignal Europe Services Techniques
McCormick Jr. Leo H.
Oberleitner Robert J.
Schwartz Chris
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