MS16624D
A SAFETY FACTOR, F= 4, IS RECOMMENDED SINCE THE RING UNDER LOAD IS SUBJECTED NOT ONLY TO THE PURE SHEAR STRESSES, BUT ALSO TO BENDING STRESSES.
(c) ALLOWABLE LOAD CAPACITY OF GROOVE WALL
TO INSURE A SAFE WORKING LOAD, A SAFETY FACTOR, F= 2, IS RECOMMENDED.
(d) MINIMUM DISTANCE BETWEEN OUTER GROOVE WALL AND END OF SHAFT =
Z= 3d |
Z = MINIMUM DISTANCE BETWEEN OUTER GROOVE AND END OF SHAFT (INCHES) |
WHERE: |
d = GROOVE DEPTH {INCHES) |
1/ X = 120,000 PSI ULTIMATE SHEAR STRENGTH FOR RINGS UP TO AND INCLUDING .672 INCH SHAFT DIAMETER OF CARBON STEEL OR CORROSION RESISTANT STEEL
X = 150,000 PSI ULTIMATE SHEAR STRENGTH FOR RINGS .688 INCH AND OVER SHAFT DIAMETER OF CARBON STEEL OR CORROSION RESISTANT STEEL
X = 110,000 PSI ULTIMATE SHEAR STRENGTH FOR RINGS OF ALL SHAFT DIAMETERS AND OF BERYLLIUM COPPER.
(e) DIFFERENTIAL ROTATION =
THE CONDITIONS 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 BOTIOM OF THE GROOVE, FORMULATED AS FOLLOWS:
P = ALLOWABLE THRUST LOAD EXERTED BY ADJACENT PART (POUNDS) |
|
fPN s sTE2 |
f = COEFFICIENT OF FRICTION |
18 OR |
s = WORKING STRESS OF RING UNDER MAXIMUM EXPANSION (PSI) 2/ |
WHERE: |
T = RING THICKNESS (INCHES) |
P s sTE2 |
E = GREATEST WIDTH SECTION OF RING (INCHES) |
f18N |
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.
(f) IMPACT CAPACITY OF RING OR GROOVE WALL =
IR = PT - FOR THE RING (INCH POUNDS), ABUTTING COMPONENTS TO HAVE SHARP CORNERS.
2
IG = Pd - FOR THE GROOVE (INCH POUNDS)
2
P = ALLOWABLE THRUST LOAD OF RINGS OR GROOVES (POUNDS) WHERE: T = RING THICKNESS (INCHES)
IG = IMPACT CAPACITY OF GROOVE WALL (INCH POUNDS)
d = GROOVE DEPTH (INCHES)
IR = IMPACT CAPACITY OF RING (INCH POUNDS)
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