In many practical situations, you may have come across washers that were not totally flat, but curved in nature. These curved washers are called Belleville spring washers.
What is Belleville Spring Washer �...
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What is Belleville Spring Washer – Belleville Spring Washer Design, Advantages and UsageAs you can see from the picture above, a Belleville spring washer is curved in cross section. Apart from that’ everything is similar to an ordinary washer. It has a centre hole, through which bolt is inserted for assembling it.
A Belleville spring washer is placed at one end of a bolted joint in place of ordinary washer. Specific torque (depends upon the Belleville spring washer design) should be applied for tightening the nut. After the tightening is done, the spring action of the Belleville spring washer protects the joint from loosening even in a rough environment.
If a bolted joint requires multiple Belleville spring washers to be used at a place then the washers can be assembled in two possible ways:
Butting the concave surface of the top washer to the convex surface of the bottom washer.
Butting the convex surface of the top washer to the convex surface of the bottom washer or vice versa.
The first case is called “Parallel” stacking and the second case is called “Series” stacking.
Curved cross section of Belleville spring washer produce spring action in the bolted joint. To get the full benefit of a Belleville spring washer, check out the Belleville spring washer design load and apply tightening torque accordingly.
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