Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1994-03-07
1996-09-03
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 731, 188 7335, 188 7336, 188 7343, F16D 55226
Patent
active
055515371
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a disk brake for a motor vehicle, comprising a first support which is fixed with respect to the vehicle, a second support shaped into a caliper and slidably mounted with respect to the first one, pads each of which is held by one of the supports so as to resist the drive forces to which it is subjected in the event of braking, and a brake motor associated with the second support and capable of being actuated so as to give rise to the application of said pads onto the disk according to a movement which is substantially perpendicular to the latter, each pad having a central friction zone and two lateral ends, the first of which is offset with respect to the central zone in the direction of rotation of the disk and at least the second of which has a drive profile, the support of this pad having a retaining profile interacting with this drive profile in order to retain this pad when it is stressed in the direction of rotation of the disk by the drive forces, and at least the first end of each pad having an external contact surface suitable for abutting against a corresponding internal contact surface of a first bearing surface provided on the support for this pad.
Disk brakes of this type have been known for a long time in the prior art, and an example thereof is given in U.S. Pat. No. 4,044,864.
From a theoretical point of view, these brakes a priori have the advantage of allowing the pad, on which the driving loads are applied in the event of braking, to transmit these loads to the support which holds it in place, that is to say generally to the first support called a "carrier", through each of the ends of this pad, one of which thus works in traction, and the other in bearing.
From an actual point of view, the situation is, however, very different and much less advantageous, the simultaneous nature of the traction and thrust loads practically never being obtained.
Indeed, in known brakes of the aforementioned type, the distribution of the traction and thrust loads depends extremely critically both on the dimensions of the pad and of the support which receives it, these dimensions themselves being subjected not only to manufacturing tolerances but also to variable deformations of the brake under the effect of more or less intense braking loads, and/or more or less significant temperature rises.
In this context, the object of the invention is to propose a sliding-caliper disk brake in which the transmission to the pad support of the loads received by the latter may be produced at both ends of the pad without being subjected, in a hindering fashion, to the influence of undesirable parameters such as those which have just been expounded.
To this end, the disk brake of the invention is essentially characterized in that one of the two contact surfaces which are face to face is concave and the other convex, in that the convex contact surface has a rounded profile, in that the concave contact surface points in a direction which is substantially perpendicular to a radius of the disk passing through the central zone of this pad and has at least two tangents which are oblique with respect to the direction in which this concave surface points, and between them forming a non-zero angle, in that a radial clearance and a tangential clearance separate the concave and convex contact surfaces in the absence of said drive forces, and in that each pad is stressed with respect to its support by an elastic force having at least a first component pointing along the radius of the disk which passes through the central zone of this pad and a second component perpendicular to the radius of the disk passing through the central zone of the pad and pointing in the direction of rotation of the disk, from which it results that the contact surfaces bear one against the other with a non-zero bearing force, even in the absence of actuation of the brake.
Although the use of concave and convex contact surfaces is described in Patents EP-B-O,002,399 and EP-A-357,469, each of these prior documents describes a bra
REFERENCES:
patent: 4044864 (1977-08-01), Karasudani
patent: 4219106 (1980-08-01), L upertz et al.
patent: 4335806 (1982-06-01), L upertz
patent: 4527667 (1985-07-01), Courbot
patent: 4993519 (1991-02-01), Thioux
patent: 5111914 (1992-05-01), Thiel et al.
patent: 5113978 (1992-05-01), Weiler et al.
patent: 5297659 (1994-03-01), Thiel et al.
Maligne Jean Charles
Mery Jean Claude
AlliedSignal Europe Services Techniques
Butler Douglas C.
McCormick Jr. Leo H.
LandOfFree
Disk brake using a pulled pad with sliding bearing 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 using a pulled pad with sliding bearing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk brake using a pulled pad with sliding bearing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1945605