MS16632 Ring, Retaining, External, Crescent Reduced Section Type

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8

MS16632C

(d)  MINIMUM DISTANCE BETWEEN OUTER GROOVE WALL AND END OF SHAFT =

Z= 2d                                                                     Z = MINIMUM DISTANCE BETWEEN OUTER GROOVE AND END OF SHAFT (INCHES)

WHERE:     d = GROOVE DEPTH (INCHES)

(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:

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 =

WHEN THE RADIUS OR CHAMFER OF THE RETAINED PART DOES NOT EXCEED THE MAXIMUM RADIUS ALLOWED FOR THE BOTTOM OF THE RING GROOVE, THE LESSER LOAD CAPACITY COMPUTED FROM THE FORMULAS ON PAGES 6

AND 7 WILL APPLY.  THE CORNER RADII AND CHAMFERS LISTED ON TABLE I WERE CHOSEN AS LARGE AS POSSIBLE

FOR THE RING SIZES INVOLVED AND ARE RELATED TO THE MAXIMUM THRUST LOADS LISTED IN TABLE VI.  IF THE CORNER RADII OR CHAMFERS ARE SMALLER THAN THOSE LISTED, THEN THE THRUST LOADS INCREASE PROPORTIONALLY, IN ACCORDANCE WITH THE FOLLOWING FORMULAS:

P1         =      P CH                                                        p1 = NEW ALLOWABLE THRUST LOAD

1

CH                OR

WHERE:

P = LISTED ALLOWABLE THRUST LOAD

1

CH   = NEW (SMALLER) CHAMFER

CH = LISTED CHAMFER

1                                                                                   1

P           =      PR                                                          R

= NEW (SMALLER) CORNER RADIUS

1                                                          R   = LISTED CORNER RADIUS

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.

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