Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1996-10-17
1998-09-22
Young, Lee W.
Brakes
Wheel
Axially movable brake element or housing therefor
F16D 6514
Patent
active
058101225
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a disk brake for a motor vehicle comprising: a caliper straddling a brake disk; a carrier fixed to the vehicle; application means comprising a cylinder secured to the caliper and closed by a piston; guide means allowing the caliper to slide relative to the carrier when the application means are actuated, these guide means themselves including first and second identical cylindrical guide pins parallel to each other and each having a bound end fixed to the caliper and a free end, and first and second housings at least partially formed by first and second respective bores made in the carrier and in which the first and second guide pins respectively slide, at least one of these guide pins being fixed to the caliper by adjustable fixing means, allowing it, before it is permanently fixed to the caliper, to adopt a plurality of possible positions spaced apart from one another in a direction tangential to the disk; and two friction pads pointing towards opposite faces of the disk, trapped between the piston and the caliper and applied to the disk when the application means are actuated.
Such brakes are well known in the prior art, as shown, for example, by the document FR-A-2,353,755, or the equivalent document GB-A-1,572,451.
The production of brakes of this type, known as "sliding-caliper brakes", runs into several difficulties, especially in obtaining accurate centring of the guide pins in the housings in the carrier at the moment of fitting the brake, and in obtaining good sliding of these guide pins in the housings when this brake is actuated.
It has been proposed to solve these difficulties by giving the guide pins different cross sections, and by contriving for the free end of the more slender of them to be matched to the inside diameter of the corresponding housing by means of a flexible sleeve, the rest of the length of this guide pin in contrast having a smaller diameter so that it can slide in the housing with a very substantial clearance.
A brake of this type is described, for example, in the patent application JP-A-1,224,530 published on 7 Sep., 1989.
In practice, such a brake, however, poses quite tricky fitting problems, the guide pins tending to offcentre at the moment when they are screwed onto the caliper.
The invention falls within this context and its object is to provide a sliding-caliper disk brake whose structure is simple and which is easy to fit.
To this end, the brake of the invention which moreover complies with the preamble hereinabove, is essentially characterized in that the first bore, over first and second contiguous sections of its length, has first and second respective inside diameters, the second of which is greater than the first, the smaller diameter being formed in that one of the two sections of the first bore that the first guide pin encounters first when penetrating therein, and in that the first housing is formed, in addition to the first bore, from inside a ring of elastomeric material located in the extension of the first section of the first bore so that it is contiguous with this first section and some distance from the second section.
Preferably, the first section furthermore has a shorter length than that of the second section, and the second housing is at least partially formed by a second ring made of an elastomeric material, similar to the first one.
Other features and advantages of the invention will emerge clearly from the description thereof given hereafter by way of non-limiting indication with reference to the appended drawings in which the single FIGURE is a partial sectional view of a brake in accordance with the invention.
As this FIGURE shows, the invention relates to a disk brake for a motor vehicle comprising: a caliper 1 straddling a brake disk 2; a carrier 3 fixed to the vehicle; application means comprising a cylinder 4 secured to the caliper and closed by a piston 5; guide means 6, 7, 8, 9 allowing the caliper to slide relative to the carrier when the application means are actuated; and two friction pads 10, 11 poin
REFERENCES:
patent: 4446948 (1984-05-01), Melinat
patent: 4976339 (1990-12-01), Le Marchand
patent: 5526904 (1996-06-01), Walden et al.
Gerard Jean Louis
Le Deit Gerard
Mery Jean Claude
Tribuzio Pasquale
Tristano Nicolas
Bosch Systems de Freinage
McCormick Jr. Leo H.
Young Lee W.
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