Spaenaur

Typical Disc Spring Characteristics
D
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
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)
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 13
CORRECT WRONG CORRECT WRONG
D46