MS16633D
(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 FUNCTIONAL 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 STE12 f = COEFFICIENT OF FRICTION
18 OR s = WORKING STRESS OF RING UNDER MAXIMUM EXPANSION (PSI) 2/
WHERE: T = RING THICKNESS (INCHES)
P s STE12
E1 = LARGEST WIDTH SECTION OF RING (INCHES)
f18N N = NEUTRAL RING DIAMETER (INCHES), FREE DIAMETER PLUS 1 1/2 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 RING OR GROOVE (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)
(g) LOAD CAPACITY, WITH THE RETAINED PART RADIUSED OR CHAMFERED.
THE ALLOWABLE THRUST LOADS, WHEN COMPUTED FROM THE FORMULAS ON PAGE 6, WILL NOT BE AFFECTED WHEN THE (E) RINGS ARE USED AGAINST PARTS HAVING CORNER RADII OR CHAMFERS UP TO THE LISTED MAXIMUM DIMENSIONS.
21 S = 250,000 PSI WORKING STRESS FOR RINGS OF CARBON STEEL OR CORROSION RESISTANT STEEL. S = 180,000 PSI WORKING STRESS FOR RINGS OF BERYLLIUM COPPER.
4. CHANGES FROM PREVIOUS ISSUE. MARGINAL NOTATIONS ARE NOT USED IN THIS REVISION TO IDENTIFY CHANGES WITH RESPECT TO THE PREVIOUS ISSUE DUE TO THE EXTENT OF THE CHANGES.
MILITARY INTEREST
Custodians: Preparing activity: Army - AR DLA - IS
Navy - OS
Air Force - 99
Review activities: Army - AV, GL, MI
(Project 5325-2012-007)
NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https://assist.dla.mil.
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