Mounted freewheel
A mounted freewheel is a complete unit fitted externally to the drive, for example at the shaft end. This simplifies assembly, inspection and replacement in service. Mounted freewheels act as a backstop or overrunning clutch.
Freewheels and Backstops by REEL
Freewheels and backstops transmit torque in one direction of rotation and release in the other. REEL supplies sprag and roller freewheels for mounted or built-in use, equivalent replacements for older models and the overhaul of existing freewheels. Power transmission since 1950, Made in Germany.
Variants
Sprags or rollers
Both variants transmit torque in the locking direction and run free in the other. They differ in the elements that lock between the inner and outer ring.
Sprag freewheels
Freewheels with centrifugal sprag lift-off (cage freewheels)
Sprags held in a cage transmit torque in the locking direction and release in the freewheeling direction. Sprags with centrifugal lift-off disengage at overrunning speed, reducing wear and friction in continuous operation. Suitable for high overrunning speeds.
Request specifications
Roller freewheels
Freewheels with cylindrical rollers
In the locking direction the rollers wedge between the inner and outer ring and so transmit the torque. In the freewheeling direction they release and run free.
Request specificationsWe size torques, speeds, sizes and materials for your application on request.
Installation
Mounted or built-in
Independently of the variant, we distinguish by the installation situation.
Built-in freewheel
Built-in freewheels are integrated into your design, saving space directly in housings, hubs or gearboxes. We size the right version for your available space and application.
Replacement and overhaul
Standard freewheels and replacement solutions
We offer a wide range of standard freewheels as well as technically equivalent alternatives for older models that are no longer available. This lets you keep running your drive reliably in its existing technical configuration.
- Self-contained freewheels
- Built-in freewheels
- Technically equivalent alternatives to BSD designs
- Special designs on requestLarger special components are listed under custom solutions.
Overrunning clutch
REEL-ÜK overrunning clutch
Overrunning clutches are an essential component in systems with high maintenance requirements or very large inertias. Start-up and setting up are done with a slow auxiliary drive; the faster main drive then takes over and the auxiliary drive is switched off.
Robust steel claw clutch
The REEL-ÜK absorbs fluctuating torques and heavy shocks during start-up. When overrunning, the inclined claw faces push the motor-side claw part back axially and a drop weight moves it into its end position, so the claws are fully disengaged. Re-engagement is manual via the clutch shift and only at standstill. Low wear ensures a long service life with little maintenance.
| Size | Nominal torque | Max. speed |
|---|---|---|
| 325 | 13,000 Nm | 1,600 min⁻¹ |
| 450 | 32,500 Nm | 1,300 min⁻¹ |
| 560 | 60,000 Nm | 1,000 min⁻¹ |
| 660 | 110,000 Nm | 800 min⁻¹ |
Speeds apply to the drive side.
- Right-hand and left-hand versions
- Clutch shift optional, with two sensors for the on/off position
- Special designs possible
Engineering and Enquiry
Find the right design
You know the application, we know power transmission. Tell us the direction of rotation, torque, speed, shaft diameter and installation situation, and we will find the right freewheel.
For engineering we need
With these parameters we find the right freewheel.
- Direction of rotation
- locking / freewheeling direction
- Torque
- in Nm
- Speed
- in min⁻¹
- Shaft diameter
- in mm
- Installation
- mounted / built-in