Sprag Clutch Backstop
Cooling Tower Parts
The Marley® integral Sprag Clutch Backstop is custom designed and configured specifically for a Marley Geareducer®. Also referred to as a sprag clutch anti-rotation device, these units are designed to prevent reverse rotation of the fan, Geareducer and motor.
When operating, the outer race is stationary and the inner race is rotating. When facing the input shaft of the Geareducer, the forward (over-running) direction is clockwise.
In contrast to conventional sprag clutch devices which may continuously wear, this device utilizes a “Lift-off” sprag functionality which alleviates the wear issue once typical rotation speeds are reached.
This feature greatly diminishes the friction and heat generated, thus promoting longevity for both the clutch unit and the Geareducer itself.