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Beveled rings for rigid endplay take-up

15th October 2014

Rotor Clip explains how beveled rings act like a wedge and provide a rigid axial endplay take-up

Beveled rings for rigid endplay take-up
The drawings at left, top and bottom show minimum groove engagement; that is, with the ring seated to at least half the groove depth

Beveled rings serve essentially the same purpose as normal retaining rings but they work on a different principle. Advantage is taken of the ring’s spring characteristics, but in the ring’s own plane. The internal ring has a 15 degree bevel along the outer periphery, the external ring along the inner edge. The groove profile corresponds to that of the ring, with the beveled wall bearing the load. Here, too, the calculation of groove location is of utmost importance.

The internal ring is compressed to less than its free diameter, whereas the external ring is spread more than its free diameter. The spring properties of the rings will cause the internal type to open and the external type to close more completely, in each case exerting axial pressure against the retained part. The groove location must be precise to prevent full bottoming of the ring in the groove. The ring acts as a wedge between the groove wall and the part, which it locks rigidly. The assembly will not “breathe” as with a bowed ring that may deflect under load.

While the beveled edge of the ring moves along the beveled groove wall for further endplay take-up, until it may conceivably reach the position shown for maximum groove engagement, it cannot back out, even under load.

It is important to note that bowed rings offer greater endplay take-up than beveled retainers. However, beveled retainers offer rigid endplay take-up and should be considered where cyclic loads occur. (High rotational speeds do not work well with beveled retainers.)

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