Disk brake using a pad which is urged to rotate

Details Disk brake using a pad which is urged to rotate Disk brake using a pad which is urged to rotate

1997-05-21

1999-03-16

Poon, Peter M.

Brakes

Wheel

Axially movable brake element or housing therefor

188205A, F16D 6540

Patent

active

058818480

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a disk brake for a motor vehicle, comprising: two brake elements which can move with respect to each other, one of which is a caliper straddling a brake disk and the other of which is a carrier fixed to the vehicle; clamping means comprising a tip of the caliper, the tip consisting of a flat shaping of the caliper formed facing a first face of the disk, and a cylinder connected to the caliper and closed by a piston turned toward a second face of the disk; guide means allowing the caliper to slide with respect to the carrier under the effect of urging from the clamping means; and first and second friction pads turned respectively toward the first and second faces of the disk, clamped between the piston and the tip of the caliper and moved in an axial direction of the piston by urging from the clamping means until they are applied against the disk; each of the two pads exhibiting two substantially flat faces, the first of which is partially covered with a friction material, and two lateral lugs; the first and second lugs of the first pad interacting with first and second respective supports of the carrier; and the first pad carrying, on its second face, an elongate spring, with two main branches, which points in a tangential direction of the disk and is intended to hold the first pad on the tip of the caliper and elastically clamps the tip of the caliper between the respective free ends of its two branches and the second face of the first pad.


BACKGROUND OF THE INVENTION

Devices which comply with this definition, which encompasses a number of disk brakes, are well known in the prior art, as shown, for example, in the documents U.S. Pat. No. 4,082,166 and EP-A-0 112 255.
One of the problems posed in disk brakes, particularly those which use pads of the type identified previously, lies in the difficulty of giving the pad, particularly the so-called "outboard" pad which is distant from the piston, a predetermined and reproducible position.
This difficulty is particularly troublesome if the pad is attached to the carrier and/or assumed to bear continuously against it, poor positioning of the pad with respect to the caliper then giving rise upon braking to a transient condition which is both noisy and ineffective.
The invention falls within this context and its object is to provide a braking device which, although it is of simple structure, ensures that the outboard pad has a predetermined and reproducible position with respect to the carrier.


SUMMARY OF THE INVENTION

To this end, the brake of the invention, which in other respects complies with the preamble hereinabove, is essentially characterized in that the ends of the two main branches of the spring point toward the tip of the caliper and bear elastically against respective bearing surfaces of the tip of the caliper, in that the bearing surfaces are inclined both with respect to the axial direction of the piston and with respect to the first face of the disk, and in that the bearing surfaces exhibit opposite slopes with respect to the axial direction of the piston, so as partially to convert the elastic bearing of the free ends of the branches of the spring on the bearing surfaces into a torque urging the first pad to rotate about an axis parallel to the axial direction of the piston.
For example, the bearing surfaces may be formed by the edges of two respective V-shaped grooves cut in the tip of the caliper, and the free ends of the branches of the spring are preferably cut into a point with a rounded end.
The features of the invention are particularly useful in a brake in which the first lateral lug of the first pad at least, and the first support of the carrier, exhibit partially complementary profiles which fasten the first pad with respect to the carrier and in which the second lateral lug of the first pad at least, and the second support of the carrier, exhibit respective regions in contact with each other and ensuring that the first pad bears continuously against the carrier.
According to one possible embodiment

REFERENCES:
patent: 4467897 (1984-08-01), Kubo et al.
patent: 4560037 (1985-12-01), Gumkowski et al.
patent: 5551537 (1996-09-01), Mery et al.

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