SAE AS 14169-2000 pdf download CIRCULAR SPLINE AND ADAPTER DETAILS ENGINE DRIVEN ACCESSORIES
NOTES
1. DIMENSIONS
ALL LINEAR DIMENSIONS ARE IN INCHES EXCEPT ROUGHNESS WHICH ARE IN MICROINCHES.
2. APPLICATION
THE SPECIFIED ADAPTERS MAY BE USED ONLY WITH INVOLUTE SPLINES HAVING 30 DEGREES PRESSURE ANGLES.
3. SPLINES
MALE SHAFT SPLINES SHALL HAVE A MINIMUM SURFACE HARDNESS OF 34 ROCKWELL C TO A MINIMUM ANGLES.
4. FINISH
ALL BURRS AND SHARP EDGES SHALL BE REMOVED.
5. APPLICATION CIRCULAR SPLINE COUPLINGS MAY BE USED AS REPLACEMENTS FOR WORN INVOLUTE SPLINE COUPLINGS WITHOUT MODIFICATION OR REPLACEMENT OF THE AIRCRAFT ACCESSORY DRIVE PAD SHAFT (FEMALE SPLINE). PRIOR TO RETROFIT, THE FEMALE SPLINE SHALL BE THOROUGHLY CLEANED TO REMOVE SEDIMENT AND GREASE. THE DESIGN RESULTS IN AN INTERFERENCE FIT OF THE SPLINE ADAPTER INTO THE INVOLUTE SPLINE AND A SLIDING FIT OF THE CIRCULAR SPLINE SHAFT INTO THE ADAPTER.
6. INSTALLATION THE NONMETALLIC SPLINE ADAPTER IS DESIGNED TO BE INSTALLED IN THE DRIVE SHAFT FEMALE SPLINE PRIOR TO INSTALLING THE DRIVEN ACCESSORY. NONMETALLIC SPLINE ADAPTERS ARE INTENDED TO FIT TIGHTLY IN THE FEMALE SPLINE IN WHICH THEY ARE INSTALLED. TO AVOID DAMAGING THE DRIVE SHAFT OR ACCESSORY SHAFT BEARINGS AND SEALS, THE SPLINE ADAPTERS SHOULD BE PRESSED INTO THE MATING SPLINES AND THE PRESSURE SHOULD BE REMOVED AS SOON AS THE SPLINE ADAPTER IS FULLY INSTALLED.
7. RETENTION AND PRELOAD THE NONMETALLIC SPLINE ADAPTERS HAVE BEEN DESIGNED TO FIT TIGHTLY IN NEW FEMALE SPLINES. THE TIGHTNESS OF THE FIT WILL DIMINISH WHEN THE NONMETALLIC ADAPTER IS INSTALLED IN WORN OR USED FEMALE SPLINES. THE SPLINE ADAPTER HAS BEEN DESIGNED TO FIT TIGHTLY TO ACHIEVE A COMPRESSIVE PRELOAD WHICH EXTENDS THE OPERATING TORSIONAL RANGE OF THE NONMETALLIC SPLINE ADAPTER. THE TIGHT FIT ALSO PROVIDES A RESISTANCE TO AXIAL MOVEMENT WHICH AFFORDS SOME DEGREE OF RETENTION. HOWEVER, THE APPLICATION GENERALLY SHOULD REQUIRE SOME POSITIVE METHOD OF AXIAL RETENTION OF THE PART. POSITIVE RETENTION CAN BE ACHIEVED BY A VARIETY OF METHODS INCLUDING LENGTHENING THE NONMETALLIC ADAPTER, INCORPORATION OF FLANGES IN THE ADAPTER DESIGN, AND THE USE OF SNAP OR SPIRAL LOCK RINGS TO LIMIT THE AMOUNT OF AXIAL CLEARANCE.
8. MATERIAL SELECTION THE PLASTIC SPLINE ADAPTER SHALL BE FABRICATED FROM HIGH STRENGTH, SELF-LUBRICATING POLYMERIC MATERIALS HAVING ULTIMATE COMPRESSIVE STRENGTHS OF A MINIMUM OF 28,000 PSI. TYPICAL MATERIALS INCLUDE THE POLYIMIDE, ARAMID AND POLYAMIDE-IMIDE RESINS, BELONGING TO THE DUPONT VESPEL AND AMOCO TORLON FAMILIES. THE PROCESS OF MATERIAL SELECTION SHOULD CONSIDER STRENGTH, FATIGUE AND AGING PROPERTIES, FLUID COMPATIBILITY, THERMAL EXPOSURE, DIMENSIONAL STABILITY, AND FORMING PROPERTIES.
SAE AS 14169-2000 pdf download
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