Section D

Disc Springs (Washers) - Typical Characteristics Rondelles à ressort (Belleville) – caractéristiques typiques DISC SPRING Damping (Hysteresis) In disc spring stacks, particularly those with parallel units, friction must be considered. Friction occurs due to contact of the spring face (radial wall). As a result, the spring force increases on loading, and decreases on unloading....giving the damping effect. The load value is a function of the number of disc springs in parallel, as shown on the graph. An approximation of load increase or decrease is on the order of 2-3 per

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cent per each set of 2. 18 x 8.2 x 0.7 x 1.25 OA (.709 x .323 x .0276 x .0492 OA)

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Measured characteristic of various disc spring stacks: Stacks consisting of 10 single disc springs or 10 multi spring components were tested. Curve 1: Single discs of 10 in series

Curve 2: 10 sets of 2 parallel Curve 3: 10 sets of 3 parallel

GUIDING THE DISC SPRING

It is preferable to guide disc springs by means of a rod through the I.D. rather than in a sleeve over the O.D. The springs at either end of the stack should contact hardened thrust washers with their outer diameter. The surface finish of the thrust washer should match that of the guide rods.

Springs at the moving end of a stack are more or less over deflected by comparison to the calculated value. Springs at the opposite ends are under deflected. The greatest relative movement occurs between the last spring in a stack and the guide rod. Friction between the disc springs, as well as between the springs and the guide rod, are greatest at the moving end.

CATALOG 14

CORRECT

WRONG

CORRECT

WRONG

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