Defining Disc Springs

In the middle of the nineteenth century the conical shaped spring disc was invented. This spring disc was subsequently termed a “Belleville Washer” after the name of its inventor, Julian F. Belleville. In the 21st century, disc springs are used in endless devices such as spacecraft, satellites, medical devices, defence systems, automobiles and machine tools, to name a few.

Disc springs are conical shaped washers designed to be loaded in the axial direction only… “F”. Disc springs can be statically loaded, either continuously or intermittently, or cyclically deflected i.e. dynamically loaded.

Buy using disc spring singularly or stacked in combinations variable spring characteristics can be achieved to suite a given application.

disc springs used on teh london eye

Description of Disc Springs

Disc Spring without Contact Flats

illustration of disc spring without contact flats

Disc Spring with Contact Flats

illustration of disc spring without contact flats

For disc springs with a material thickness greater than 6mm, Din 2093 specifies that a contact flat should be applied to the top inside diameter and the bottom outside diameter of the disc spring, see above drawing.

These contact flats aid alignment of the disc springs during stacking, but cause a reduction in the lever arm length and therefore an increase in the spring force. This is compensated by reducing the material thickness, which doesn’t alter the overall height or spring force at 75% from the original disc but does increase the cone angle.

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