Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1996-11-18
1997-12-30
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 731, 188 7338, 188250B, 188250G, 188234, 188370, F16D 5500, F16D 6540, F16D 6502, F16D 55224, F16D 65092
Patent
active
057019789
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to brakes and more particularly relates to a set of brake pads for a floating-caliper disc brake.
BACKGROUND OF THE INVENTION
A floating-caliper disc brake including a generic set of brake pads is disclosed in German patent application No. DE 38 15 733. The known set of brake pads comprises a first brake pad with a first retaining spring made of resilient sheet metal for clamping engagement on the brake piston and a second brake pad with a second retaining spring for clamping engagement on an external housing leg of the floating caliper. The first and second retaining springs have an identical design. Also, the bore in the brake piston provided for engagement of the first retaining spring has the same diameter as the recess in the external housing leg, which recess has the shape of part of a circle and is provided for engagement of the second retaining spring.
Preferably, the two brake pads have an identical design in the prior art disc brake, and interchanging the two brake pads will not cause any problems. If, however, for functional reasons, a different form of friction lining is provided for use on the first brake pad than for the second brake pad, the two brake pads must not be interchanged during the assembly. If, on the other hand, the backplates of the two brake pads do not differ from each other and, further, the guide surfaces of the disc brake for support of the backplates on the axially inner side and the axially outer side are equally arranged, the first brake pad intended for use on the axially inner side would easily allow being mounted on the axially outer side, and vice-versa. The result of such an occurrence would be functional deficiencies of the disc brake. An object of the present invention is to provide a set of brake pads made up of different brake pads for a floating-caliper disc brake, permitting a first brake pad to be fitted only on the axially inner side and a second brake pad to be fitted only on the axially outer side of the floating caliper.
Principally, the solution involves simply making the retaining spring, which is already provided for attachment of the brake pad, a distinctive feature by configuring it differently for the first brake pad and for the second brake pad. When the set of brake pads is mounted correctly, each spring is retained in its associated opening in the. brake piston or the external housing leg. When the brake pads are interchanged, however, the large retaining spring does not permit insertion in the small opening, and the small retaining spring does not permit clamping engagement in the large opening. Wrong assembly with mixed up sets of brake pads is, thus, impossible with the set of brake pads according to the present invention. Another advantage is that the present invention does not cause higher manufacturing costs for the set of brake pads or the associated disc brake.
In a preferred embodiment, the dimensions of the first retaining spring are smaller than those of the second retaining spring. A further preferred embodiment permits clamping engagement of the two opposed resilient tongues. The force components directed in parallel to the brake disc will compensate each other, and only a force component directed in parallel to the axis of the brake piston remains for application of the brake pad on the brake piston.
A third resilient tongue is arranged vertically to the other two resilient tongues and has no partner so that it exerts a force that is generally directed to the axis of the brake piston to apply the brake pad to the guide surfaces of the disc brake and prevent rattling. It is preferred that the portion of the third resilient tongue, that is used for application, generally has the same distance to the axis of the brake piston as the other two resilient tongues.
In a preferred embodiment, the two retaining springs have an identical design, with the exception of the distances between the resilient tongues. Preferably, the dimensions of the two retaining springs differ by 10% approximately.
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Search Report of the German Patent Office for Application No. P4340454.5.
Schiel Wolfgang
Weiler Rolf
Butler Douglas C.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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