Sprag Clutch, Complete Freewheel Clutch Unit RA 437 Z

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RA 437 Z
Part NumberRA 437 Z
TypeComplete Freewheel Clutch Unit
SpringZ (Tension)
SealedYes
LubricationOil
Inner Ring KeywayYes
Outer Ring KeywayNo
Integrated Ball BearingYes
Integrated Roller BearingYes

Shaft & Housing Tolerances

Shaft Tolerancek5
Housing ToleranceN/A
Shaft & Housing Chamfer1mm × 15°

Geometrical Data

Bore Diameterd [mm]15
Outer DiameterD [mm]65
Inner Ring Keyway Widthb [mm]5
Inner Ring Keyway Deptht [mm]2.3
Weight [kg]0.81

Ratings

Nominal TorqueT [N*m]161
Nominal TorqueT [ft*lb]118.7
Max. Static Radial LoadCstat [N]8661
Max. Dynamic Radial LoadCdyn [N]8962
Max. Indexing Frequency [Hz]10
Max. Speed2n [RPM]1700
Max. Operating Temperature [°C]110

Notes:

  1. The stated speed and torque ratings are contingent on utilizing specified tolerances, correct installation techniques, and operating temperature and load conditions below the specified maximums. If specific applications differ, please consult GMN USA engineers.
  2. The stated RPM value is for the maximum freewheel rotational speed for the sprags, not the shaft or housing. High freewheel rotational speeds can produce centrifugal forces that can cause the sprags to lift off from frictional contact, therefore creating an opportunity for improper engagement and potential slip. The sprag RPM must be below the listed value before engagement occurs. The actual sprag freewheel speed is difficult to determine because the sprags are driven by frictional forces from the race(s) and lubrication. Theoretically there is no maximum rotational speed in the driving direction; the inner race, sprags, and outer race rotate as one unit unaffected by centrifugal forces. Please consult GMN USA engineers with high RPM applications that approach or exceed the stated RPM rating.

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