Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1998-05-06
2000-05-16
Oberleitner, Robert J.
Brakes
Wheel
Axially movable brake element or housing therefor
188370, F16D 6514, B60T 1100
Patent
active
060623497
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a disk brake for a motor vehicle.
More specifically, the present invention relates to a disk brake of the type comprising: two brake elements which can move one with respect to the other, one of which is a caliper straddling a brake disk and the other of which is a support fixed to the vehicle, the disk adopting a first direction of rotation when the vehicle is moving in a forward gear, and the support having at least a first and a second radial branch, which branches extend axially on each side of an opening straddling the disk; brake-application means comprising a cylinder secured to the caliper and having, facing the disk, an opening which is closed by a moving piston, the disk passing between this piston and a spur of the caliper; two friction pads each comprising at least one lining and a carrier plate having a first end and a second end, the friction pads pointing toward opposite faces of the disk, trapped between the piston and the spur of the caliper and pressed against the disk when the brake-application means are operated, the second end of each friction pad following on from the first end of this pad in the first direction of rotation; and guide means allowing the caliper to slide with respect to the support when the brake-application means are operated, these guide means comprising at least one first guide pin fixed to the caliper at right angles to the disk, a first bore in which the first guide pin can slide axially, and a first guide tube connected to the fixed support at right angles to the disk and in which the first bore is pierced, an external surface of said first guide tube slideably accommodating the respective first ends of the friction pads.
BACKGROUND OF THE INVENTION
Such a brake is known, for example, from the prior art, from U.S. Pat. No. 4,401,194.
One problem arising in brakes of this type which are known as "sliding-caliper brakes" is the difficulty of envisaging, in concrete terms, the use of light alloys for producing calipers and the fixed supports because of the tricky use of inserts obtained by casting especially where the pads slide and the need to provide reinforcements in order to limit the deformation under stress.
SUMMARY OF THE INVENTION
The invention falls within this context and its purpose is to provide a sliding-caliper disk brake of a simple structure in which the guide means are designed to avoid having to resort to inserts and to limit the deformation of the support.
For this purpose, the brake of the invention, which in other respects is in accordance with the preamble above, is essentially characterized in that the first radial branch of the support has, on each side of said opening, two aligned bores pierced between first and second bearing faces of the support, respectively an inboard face and an outboard face, and accommodating the first guide tube, and in that at least the first end of each friction pad comprises attachment means allowing this end to remain in a fixed position relative to the support for the first direction of rotation.
The guide means may also comprise a second guide tube connected to the fixed support at right angles to the disk and in which a second bore is pierced, an external surface of this second guide tube slideably accommodating the second ends of the friction pads.
The attachment means of the respective first ends are preferably in the form of a hook, the opening of which points downward while the respective second ends have sliding means in the form of a slot.
The brake of the invention may be adapted to extreme operating conditions ensuring that the first guide tube at least comprises tightening means separated by an adjustable distance and capable of trapping said first and second bearing face of the support, this resulting in a tensile strain in the first guide tube at least and a compressive strain in said first and second radial branches.
The essential features of the invention will become fully beneficial when the support and the caliper are made of a low-density material such as
REFERENCES:
patent: 4355707 (1982-10-01), Saito
patent: 4401194 (1983-08-01), Klassen
Boisseau Jean-Pierre
Mery Jean-Claude
Bosch Systemes de Freinage
Comstock Warrem
King Bradley
McCormick Jr Leo H.
Oberleitner Robert J.
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