Sprag clutches are similar in functionality to roller ramp clutches. However, sprag clutches have numerous benefits over roller ramp clutches including:
Simplified Mating Surfaces
Sprag clutches operate against smooth cylindrical surfaces. Roller ramp clutches require one of the surfaces to have ramps and holes for the springs to push the rollers up the ramps. This means that roller ramp clutches typically must be provided with inner and outer rings to incorporate the ramps, while sprag clutches can operate directly against the shaft and housing.
More Compact Design
Because there are no ramps, sprag clutches don’t require nearly as much space. This means that the radial space allotment to the clutches can be much less for sprag clutches.
Higher Number of Engagement Elements
In roller ramp clutches, the amount of space needed for the ramps limits how many rollers can be used for a given clutch. Since sprags don’t need nearly as much space numerous sprags can fit in the space required for a single roller in a roller ramp clutch. More sprags mean there are more elements to transfer torque which corresponds to a higher torque capacity.
Less Rotation for Engagement
For roller ramp clutches to engage, the rollers have to move up the ramp and be wedged between the ramp and the outer ring. All the sprags have to do is twist slightly.That means the amount of rotation before the clamping element engages is less for a sprag clutch.
Interested in GMN Sprag Clutches?
Check out our Sprag Clutch Guide resources below for more information.
- Sprag Clutch 101: What It Is & How It Works
- Material & Wall Thickness Requirements
- Lubricating a Sprag Clutch: Best Practices Guide
We offer a variety of sprag clutches for several applications. Request a quote below!