Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1991-07-24
1994-07-19
Oberleitner, Robert J.
Brakes
Wheel
Axially movable brake element or housing therefor
188 7338, 188250E, F16D 6538
Patent
active
053300351
DESCRIPTION:
BRIEF SUMMARY
The invention is related to the support of brake shoes in disc brakes by hold down springs, the springs being preferably retained detachably in the brake housing caliper.
Brake shoes are generally supported on guides and reaction forces are transmitted from the brake shoe via the guides to the vehicle frame. As a rule, a clearance is provided between the guides and the brake shoe in order to make sure that the brake shoe may slide towards and away from the brake disc during actuation and release of the brake. In order to prevent any rattling noise of the brake shoe on the guides, springs have previously been used which are fixed to brake shoes and prestress them against their guides.
The prior art hold down springs create problems during assembly or disassembly of the brake calipers, such as when changing the brake linings. If the prior-art hold down springs are firmly fixed to the linings, they cannot be reused or else the springs must be especially unmounted from the linings and afterward reassembled onto the new linings. A loss of the springs may occur when separated from the linings.
A leaf-type spring mounted in the housing cover is known from the German patent application published without examination, No. 2,345,733, which describes the spring as detachably mounted in the housing and secured against falling out. Since the spring utilized there is adapted to engage the brake shoe in radial direction only by arms being positioned relatively widely apart, it is comparatively bulky.
A brake shoe spring is also known from the published European patent application with search report, No. EP-A1-0,203,841. The brake shoe spring is described as retained within a brake housing and is formed with two legs of which a first leg acts elastically in tangential direction on a first projection and a second leg elastically in radial direction on a second projection of the brake shoe. The spot-type disc brake composed of brake carrier, brake shoes, brake housing, and spring is preassembled to one unit.
From the European patent specification, No. EP-PS-0,032,462 a rod-type brake shoe spring is known which is retained at the brake caliper. Retaining elements are configured at pad carrier plates of the brake shoes which are in engagement with the brake shoe spring. When the brake caliper is removed from the carrier the friction linings are suspended at the brake caliper through the lining spring. Disadvantageously, a rod-shaped part of the spring extends parallel to the axis and engages both brake shoes so that, as a disadvantage, no difference is made between the individual requirements for the external and the internal brake shoes.
It is, therefore, the object of the invention to indicate a holding down spring detachably retained in the housing which may be manufactured at low cost, offers ease of handling and has a low weight.
It is the object of the invention to configure a simple spring to take account of the individual requirements of the external and of the internal brake shoes. In this context, particularly a compact spring is provided which requires but little mounting space.
The invention has, furthermore, an object to create a brake shoe spring which avoids any clacking noise of the linings at the end of the braking action, in particular, upon a lifting-out of the brake shoe. In addition the brake housing having the spring assembled thereto may be assembled to the brake shoes and as a consequence easy assembly of the brake is enabled.
SUMMARY OF THE INVENTION
A disc brake shoe hold down spring according to the present invention is formed of a pair of connected legs extending in a V-shape, each leg formed with a first wing. The hold down spring is adapted to be easily inserted into an undercut opening in the brake housing by pressing together the V-shaped legs. In this configuration, the external edges of the elastic wings take support in radial direction at the housing walls, whereas the internal edges of said wings come to be abutted against edges of the brake shoes and resist any radial movement of the lat
REFERENCES:
patent: 3841444 (1974-10-01), Baum et al.
patent: 4394891 (1983-07-01), Oshima
Halasy-Wimmer Georg
Jakob Matthias
Klimt Ulrich
Ruckert Helmut
Alfred Teves GmbH
Lewis J. Gordon
Oberleitner Robert J.
Seitter Robert P.
Young Lee W.
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