Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1994-10-10
1996-10-08
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 7335, F16D 55227
Patent
active
055621872
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to sliding caliper disc brakes which are intended in particular to equip motor vehicles.
The invention relates more particularly to a disc brake with a caliper slidingly mounted on a fixed support and including two friction pads received with anchorage and sliding in the fixed support, and capable of coming into frictional engagement with the opposite faces of a rotating disc when a brake motor carried by the caliper is actuated, the caliper sliding with respect to the fixed support by means of at least one axial guide pin, including a first part secured to the caliper or to the fixed support, and a second part received with sliding in a corresponding bore of the fixed support or of the caliper respectively, elastic means being disposed between the axial guide pin and the bore in which it slides.
In disc brakes of this type, the sliding mounting on the fixed support poses numerous problems which attempts have been made to solve in different ways.
For example, a rubber sleeve has already been arranged between the guide pin and the bore in which it slides, to urge the caliper to its initial position after a braking action, as in U.S. Pat. Nos. 4,334,598 or 4,436,186. On the other hand, U.S. Pat. No. 4,061,209 or GB-A-1,573,305 makes known a disc brake in which one of the bores receiving one of the guide pins is radially oversized and in which the guide pin is pressed into an eccentric position in contact with the wall of the bore by the spring normally arranged between the caliper and the friction lining, to prevent the guide pin from undergoing stresses during braking.
US-E-30 255 also makes known a disc brake of the above mentioned type, in which is disposed, between the guide pin and the bore in which it slides, an elastic bushing for urging the caliper into its initial position after a brake actuation.
However, such a construction requires the guide pin to be strictly coaxial with the bore which receives it, otherwise the sliding guidance of the caliper on the fixed support has provided only imperfectly, and vibrations of the caliper result during braking actions, which can generate significant noises and even damage or destroy the guide pin by premature wear.
The subject of the invention is therefore a disc brake of the type described above, in which the sliding of the caliper on the fixed support is provided even in the case of a parallelism defect between the guide pin and the bore which receives it, or in the case of a difference between the offsets on the one hand of the axes of the bores in the fixed support and, on the other hand, of the axes of guide pins and which allows a rotational movement of the caliper with respect to the fixed support during a braking action, without impeding the sliding of the caliper.
To this end, the invention is essentially characterized in that the second part of the guide pin consists of a tube made of an elastic material, slits being made in the thickness of the tube and, over at least part of its length, the slits being uniformly distributed along the periphery of the tube in order to form equidistant thin strips of equal width, each thin strip exhibiting, over its length, at least one corrugation of which the convexity points towards the outside of the guide pin, the radius at the crest of the corrugation at rest being greater than, or equal to, the radius of the bore.
In that way, this guide pin part will be capable of taking account both of parallelism defects between it and the bore which receives it, and of the movements of the caliper brought about by the braking torque, without impeding the sliding of the caliper.
Other objects, characteristics and advantages of the invention will emerge from the description which follows of one embodiment given by way of example with reference to the appended drawings in which:
FIG. 1 is a plan view in partial section of a disc brake produced in accordance with the invention,
FIG. 2 is an enlarged view of the guide pin equipping the disc brake of FIG. 1,
FIG. 2A is a perspective view of the gui
REFERENCES:
patent: Re30255 (1980-04-01), Bath et al.
patent: 3616876 (1971-11-01), Brooks
patent: 3625314 (1971-12-01), Rinker
patent: 3648807 (1972-03-01), Lottridge et al.
patent: 4074795 (1978-02-01), Kondo et al.
patent: 4084665 (1978-04-01), Burnett
patent: 4265340 (1981-05-01), Scott et al.
patent: 4393963 (1983-07-01), Oltmanns, Jr. et al.
patent: 4574922 (1986-03-01), Varin et al.
patent: 4596318 (1986-06-01), Bidol
Patent Abstracts of Japan, vol. 4, No. 23 (M-093) 26 Feb. 1980 & JP-A-54160971 (Toyota) 20 Dec. 1979.
Errico Angelantonio
Tribuzio Pasquale
AlliedSignal Freni SPA
Butler Douglas C.
McCormick Jr. Leo H.
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