MS3217C
(d) Minimum distance between outer groove wall and end of shaft =
Z = 3d Where:
Z = Minimum distance between outer groove and end of shaft (Inches)
d = Groove depth (Inches)
(e) Allowable shaft diameter =
S = G2 + 4FP
Y Cf
Where:
S = Allowable shaft diameter
G = Groove depth
F = Factor of safety (see formula (c) above) P = Design load
Y = Yield strength in compression of the groove material (PSI)
Cf = Conversion factor (see formula (c) above)
(f) Differential rotation =
The condition under which a retaining ring may be used when adjacent parts rotate relative to it, fall into two categories:
(1) Where no thrust is exerted by adjacent part. In this case, differential rotation of ring and adjacent part creates no element of risk in the application of the rings because no frictional torque is exerted by the machine part on the ring.
(2) Consideration must be given to the magnitude of the thrust involved. The friction moment may not exceed the bending moment, which the ring can tolerate without releasing its pressure against the bottom of the groove, formulated as follows:
fPN s sTE2 or
18
P s sTE2
F18N
Where:
P = Allowable thrust load exerted by adjacent part (Pounds)
f = Coefficient of friction
s = Working stress of ring under maximum expansion (PSI) 2/ T = Ring thickness (Inches)
E = Greatest width section of ring (Inches)
N = Neutral ring diameter (Inches) = free diameter plus 3/4
E dimension
In such cases where differential rotation occurs, the calculation should be based on the MAXIMUM
possible value of the coefficient of friction.
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