Design, Properties & Construction of Belleville Disc Springs
Belleville Disc Springs can be designed to meet the specific requirements of a variety of applications. The characteristic load curve is a representation of the force-deflection behavior of the spring. Depending upon the dimensions ratios, the characteristic load curve of a Belleville Disc Spring is more or less digressive up to the flat position. In special cases, Belleville Disc Springs can be designed so that deflection beyond the flat position is possible.
Typically, Belleville Disc Springs are used as modular components. A group of individual Belleville Disc Springs stacked facing the same way is called a parallel spring stack. A group of individual Belleville Disc Springs facing alternate ways is called a series spring stack.
In a parallel spring stack, the deflection of the stack is equal to that of the individual spring. The load at a given deflection is proportional to the number of individual springs in the stack.
In a series stack, the deflection of the stack is the sum of the deflections of the individual springs. The load of the stack is equal to the load on the individual springs. When calculating the spring deflection and load capacity of a stack composed of individual springs or spring packs these facts must be taken into consideration.
It is possible to generate progressive characteristic curves by combining parallel spring stacks containing different numbers of Belleville Disc Springs or single springs of varying thickness to form a stack. In these cases the packs or single discs with the lower load capacity do not contribute to the deflection of the stack after reaching the flat position or their upper stroke limits, with the result that the total spring rate of the stack rises.
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