Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1991-02-01
1992-03-17
Halvosa, George E. A.
Brakes
Wheel
Axially movable brake element or housing therefor
188 731, 188 7338, 188250B, 192 30V, F16D 55227
Patent
active
050960237
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This inventions relates to a spot-type disc brake which straddles the brake disc and in which the brake shoes are mounted so that they may be removed from the disc brake housing in the radial direction without having to disassemble the housing.
A number of different designs are known for spot-type disc brakes whose structure is determined by certain requirements. These requirements include, for example, that the brake shoes must be easily removable, the detachment of retaining pins, the swiveling-off or unmounting of brake housings etc., for instance, should be avoided. According to one proposed solution, it is suggested to dispose the brake shoes in such a manner as to be removable not in the direction of the housing cover but in the opposite direction so that the housing cover does not block the assembly and disassembly path of the brake shoes.
It is known from published German patent application No. 34 25 670 (corresponding to U.S. Pat. No. 4,643,277, issued Feb. 17, 1987) to provide a spring for a brake shoe which retains the latter in elastic engagement with its guide being arranged in axial direction relative to the brake disc. Although the brake shoe disclosed in this publication offers the advantage of being very flat due to springs arranged at the backplate being renounced to (see also the German patent application No. 35 32 373) it has the disadvantage that the spring is solidly connected to the shoe and, thus, must be replaced together with the brake shoe in the event of the latter's renewal. Moreover, the known spring arrangement is not suitable for disc brakes in which the brake shoes are to be assembled and disassembled from the side of the carrier rather than from the side of the housing cover.
The present invention is, therefore, related to a spot-type disc brake and has as an object rendering it possible to remove the brake shoes toward the side of the carrier. Beyond this, the disc brake of the kind under review is to do with a particularly scarce assembly and disassembly space.
SUMMARY OF THE INVENTION
The object of the invention is achieved by a spring acting on the brake shoe, with its ends engaged with the carrier. In this manner, the wire spring urges the brake shoe onto its guide in a direction resisting removal. Beyond this, a spring at the lining backplate as described in the German patent application No. 35 32 373 may also be foregone according to the teachings of the present invention. It is true that the known spring offers the advantage of being neutral as regards the direction of mounting of the brake shoe but simultaneously it has the disadvantage of causing an increase in the overall height of the brake shoe, and thus the required assembly space is increased.
Although the disc brake according to the present invention is suited, in particular, as an internally straddling disc brake in which only a restricted mounting space for the brake shoes is available it also can be used as an externally straddling brake in which case the bent wire spring assumes at the same time the function of securing the brake shoes and preventing them from falling out of their seating. The locking-type securing function is, of course, assumed by the spring just as well if and when the inventive disc brake is used as an internally straddling disc brake.
An extension of the spring travel stroke and, as a result, a facilitation of the serviceability of the wire spring is obtained in accordance with a further embodiment.
The combination of characteristics of a further embodiment in the shape of a further evolution of the teachings of the invention allows to give the spring of the disc brake a good guidance. According to that embodiment, the first end of the spring is swivelably secured in the carrier, whereas the second end allows to be arrested at the opposite side of the carrier.
According to a further embodiment of the invention, the two carrier arms are connected by a connecting web so that the second spring end lockingly engages the connecting web. In a further impro
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patent: 4394891 (1983-07-01), Oshima
patent: 4805745 (1989-02-01), Thiel
Bungert Hans
Kast Helmut
Thiel Rudolf
Wienecke Franz
Alfred Teves GmbH
Halvosa George E. A.
Lewis J. Gordon
Seitter Robert P.
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