Brakes – Operators – Fluid pressure
Patent
1997-11-17
2000-08-29
Schwartz, Chris
Brakes
Operators
Fluid pressure
188 711, B60T 1100, F16D 5500
Patent
active
061094013
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a disc brake having a housing made of light metal.
German patent application No. 38 03 957 discloses a disc brake of this type. The prior art disc brake has a low-weight housing cast from aluminum. This is favorable especially with respect to reducing the unsprung masses on the vehicle wheel. A disadvantage of light-metal housings of this type is that corrosion and increased wear occurs at the points of support for the brake shoes. The reason is to be seen in the material of the brake shoe backing plates which almost exclusively consist of iron. Therefore, profiled rails are provided in the prior art disc brake on which the brake shoe backing plates are supported. The profiled rails are screwed to the housing. This type of attachment permits compensating for manufacturing tolerances because the profiled rails are adjusted within the limits of a predetermined clearance and, subsequently, may be fixed in the optimal position by the screws.
The problem of the brake shoe support in light-metal housings in the prior art disc brake is satisfactorily overcome as far as the technical function is concerned. However, the solution is very costly because profiled rails with a complicated shape are used, and the attachment by screws with a tolerance compensation also causes increased manufacturing costs.
SUMMARY OF THE INVENTION
An object of the present invention is to improve a disc brake having a light-metal housing so that a simple assembly which is inexpensive to manufacture is achieved especially with respect to the support of the brake shoes.
This object is achieved by casting in the supports fixed to the housing which are made of a high-strength material and provided to support the brake shoes already when casting the light-metal housing, and compensating for the tolerances, which occur in the manufacture, in a subsequent machining operation when the supporting surfaces for the brake shoes are shaped into the supports. In the disc brake according to the present invention, the machining operation for the supporting surfaces, which is also required in the state of the art disclosed in German patent application No. 38 03 957, is postponed until after the supports are attached in the housing. This renders it possible to cast the supports into the housing and to initially tolerate the occurring manufacturing tolerances which will be compensated in the subsequent machining operation. The effort needed in the state of the art for the adjustment of the supports is also eliminated in the disc brake according to the present invention. The proposed configuration of the supporting surfaces as cylinder segments arranged coaxially relative to a brake cylinder bore of the housing allows a subsequent machining of the housing in one machining operation with a cylindrical tool.
Favorable materials for the housing are aluminum or aluminum alloys. For the supports, stainless steel or titanium are appropriate.
The present invention can be implemented in a particularly favorable fashion in a disc brake as disclosed in German patent application No. 40 36 063. The prior art disc brake has a housing made of iron material wherein supports for the brake shoes are formed. After casting the housing, the supporting surfaces of the supports are favorably machined in one operation simultaneously with the manufacture of the brake cylinder bore. Preferred aspects of the present invention relate to a disc brake having a housing shape as disclosed in German patent application No. 40 36 063.
In simple embodiments of the present invention, which are especially inexpensive to achieve, the supports are configured as pins or as hollow tubular members for further weight reduction.
In a preferred aspect of the present invention, the supports themselves are supported by piled-up materials of the housing on the sides lying outwards in a circumferential direction. In this embodiment, the supports themselves may have a weaker design, with the result that material costs and weight are further re
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Leidecker Hans-Dieter
Weiler Rolf
ITT Manufacturing Enterprises Inc.
Schwartz Chris
LandOfFree
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