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Ratchet Clutch Service Factors

- A multiple intended to be used with the theoretical torque to obtain design torque, reflecting actual load conditions.

 
Overrunning  
Where service is occasional and load is steady with no pulsation or fluctuation. Where acceleration on starting is low and starting torque is less than running torque. 0.8
Continuous service, with steady load and gradual acceleration. Starting and running loads occasionally surge to 10% higher than normal. 1.0
Continuous service, with suddenly applied additional loads with minor shock, and starting torque 25% above running torque. 1.5
Continuously running service, with heavy shock loads and high starting torque. Or where extreme reliability is desired. 3.0
Extremely high starting torque loads, with instantly applied heavy shock loads and/or sudden reverse, pick-up loads or jogging. 5.0
Indexing  
Where index angle is less than 60°, frequency is less than 60 strokes per minute and instantaneous acceleration torque does not exceed 25% of normal torque. 2.5
Where index angle is between 60°and 90°, frequency is between 60 and 120 cycles per minute and instantaneous acceleration torque is moderate. 3.5
Where index angle exceeds 90°, frequency is above 120 cycles per minute and instantaneous acceleration torque is high. 5.0
Backstopping  
Where loading is occasional and well within rated torque. 1.0
Where loading is frequent, but torque is well within the rated values. 1.5
Where loading is frequent and subject to overloads up to 50% of rating. 3.0
Where loading is subject to very great excessive loads. 6.0
Adjusting  
Light load pick-up, no shock during operation. 1.0
Medium load pick-up, minor shock during operation, occasional overloads of up to 10%. 2.0
Heavy load pick-up, moderate shock during operation, occasional overloads during operation up to 100%. 3.0
Sudden load pick-up, heavy shock or overload in operation. 5.0

 

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