Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1992-04-29
1994-03-29
Oberleitner, Robert J.
Brakes
Wheel
Axially movable brake element or housing therefor
188 7337, 188 7345, 188370, F16D 65092, F16D 6538
Patent
active
052976599
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is related to the support of a floating caliper of a spot-type disc brake on an axially external brake shoe.
In a known spot-type disc brake, a floating caliper is axially slidingly supported on a brake carrier on its axially internal side by means of pin guides received on two axial pins anchored to the brake carrier, and on its axially external side it is supported on the carrier arms of the brake carrier through a brake shoe. This external side support is necessary for insuring accurate positioning of the floating caliper, since the pin guides on the pins have an inherent play. In order to prevent any rattling of the floating caliper in its guides, the latter is clamped against the brake carrier by means of a housing spring.
A spot-type disc brake of this kind is known from the German patent application published without examination, No. 3,014,057. In this instance, the floating caliper is supported on the brake carrier radially and circumferentially through two carrier elements of the axially external brake shoe . For support in the circumferential direction, the carrier elements of the brake shoe are furnished with projections which straddle the floating caliper laterally and are positioned between the floating caliper and the carrier arms of the brake carrier in the circumferential direction. For this reason, the floating caliper cannot extend out to the carrier arms in the circumferential direction and hence cannot be of the maximum possible width and rigidity.
Another spot-type disc brake of that same kind is known from the European patent No. 0,341,610. In that patent, the floating caliper is supported at a point in the center of the axially external brake shoe. For this purpose, the latter is formed with a radially outwardly pointing and preferably semicircular projection which engages a semicircular recess of the floating caliper. In contrast to the disc brake mentioned first, the floating caliper is not abutted against the lateral carrier elements of the brake shoe but extends past them in the circumferential direction . As a result, the width of the caliper is advantageously, widened to improve rigidity.
However, the lateral guide of the floating caliper at the semicircular projection of the brake shoe is less reliable. In certain mounting positions of the brake on the vehicle, for example, behind the wheel axle, the jolting received in this location may lead to the floating caliper being shifted laterally in the circumferential direction with respect to the brake disc on account of the play in its pin guide. In this case it will be urged into the radial direction and be jammed by the semicircular projection of the brake shoe.
The present invention has the object to avoid these disadvantages of the prior-art arrangements and to combine their advantages, that is to say, to create a spot-type disc brake whose floating caliper makes use of the maximum housing width and is safely guided in any mounting location.
SUMMARY OF THE INVENTION
This object is attained by providing axially extending grooves along the inside of circumferential extensions of the caliper, spaced apart in the circumferential direction, to maximize the housing width. The carrier elements of the axially external brake shoe is formed with low height projections located inward of the respective ends of the brake shoe and which extend upward to engage the caliper extension grooves, and which are firmly urged against the groove bottom by a housing spring. Owing to the groove walls being in abutment against the projections, the floating caliper is securely supported in the circumference direction. The rigidity of the caliper housing is not substantially impaired by the presence of the grooves. In the inventive floating caliper spot-type disc brake, the advantages of an increased rigidity of the caliper and of a secure support of the caliper are, thus, combined with each other.
Of particular advantage is the feature in which the bottom of each groove and at least one wall of each groove ar
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patent: 4139082 (1979-02-01), Edwards
patent: 4267904 (1981-05-01), Belart
patent: 4285417 (1981-08-01), Ostwald
patent: 4316530 (1982-02-01), Gehlen et al.
patent: 4511019 (1985-04-01), Marianu
patent: 4775033 (1988-10-01), Heibel
patent: 5069314 (1991-12-01), Madzgalla et al.
Doell Andreas
Klimt Ulrich
Thiel Rudolf
Alfred Teves GmbH
Lewis J. Gordon
Oberleitner Robert J.
Poon Peter M.
Seitter Robert P.
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