How to find the right Torque Limiters & Slip Clutches AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Torque Limiters & Slip Clutches
- Disconnect principle
- Choose friction-plate for cushioning shock loads and brief slips. Choose ball- or roller-detent for precise, repeatable trip torque. Choose shear-pin only where occasional downtime for pin replacement is acceptable. Friction types keep transmitting torque while slipping and wear their facings, detent types drop torque almost fully on trip, and shear pins need a manual reset.
- Torque setting window
- Set the slip or trip torque above the drive's peak running and start-up torque, and below the rated torque of the weakest component downstream. The unit's adjustable range should bracket that setting, not sit at either end of it. If the setting is too low, the drive nuisance-trips on start-up. If it is too high, the part you meant to protect breaks first.
- Re-engagement behavior
- Use single-position (synchronous) re-engagement when shaft timing or phasing must be preserved. Use multi-position for faster reset. Use full-disengagement types for high-inertia drives that must not re-engage while coasting. Timed machinery such as indexers and packaging lines goes out of phase if the limiter re-engages at an arbitrary angle.
- Mounting style and bore
- Match the bore and keyway (or keyless clamp) to the shaft. For sprocket or pulley mounting, confirm the hub accepts the element's bore and face width. For shaft-to-shaft use, choose a coupling-style limiter that tolerates your misalignment. Most fit problems come from a sprocket that is too wide or too narrow for the hub, or from forcing a hub-style unit to act as a coupling.
- Backlash and stiffness
- Servo and positioning axes need a zero-backlash detent design, typically paired with a bellows or elastomer coupling. Friction and standard detent units add lash or compliance that degrades positioning accuracy.
- Overload detection
- If the motor must stop on overload, choose a unit with axial plate travel on trip that can actuate a proximity sensor or limit switch. A slipping or tripped limiter with the motor still running generates heat and wear, and in friction types it can mask the jam.
Brands that matter
- Mayr: Wide range of ball-detent and friction torque limiters, including servo-grade zero-backlash designs.
- R+W: Precision ball-detent torque limiters, often integrated with bellows or elastomer couplings for servo axes.
- KTR: Industrial ball-detent and friction torque limiters, frequently combined with its coupling lines.
- Tsubaki: Friction-type torque limiters for sprockets and pulleys, plus ball-detent overload units; common on conveyor drives.
- Zero-Max: Overload safety couplings and adjustable friction torque limiters for general machinery.
- Boston Gear: Long-established friction slip clutches and overload units for light industrial drives.
- Miki Pulley: Compact friction and ball-type torque limiters for automation equipment.
What to avoid
- Sizing from the motor's nameplate torque alone, which ignores start-up, acceleration and gear-reduced torque at the limiter's shaft location.
- Using a friction slip clutch where the drive will slip continuously or for long periods: facings overheat, glaze and lose their setting.
- Getting oil or grease on friction facings, which sharply lowers and destabilizes the slip torque.
- Fitting a multi-position re-engagement unit on timed or indexed machinery that must stay in phase.
- Relying on a torque limiter as a personnel safety device, since it protects machinery, not people.
Questions
Is a slip clutch the same as a torque limiter?
A slip clutch is one type of torque limiter. It slips on friction and keeps transmitting roughly its set torque. Ball-detent and shear-pin limiters instead disconnect almost completely when they trip.
Where in the drive should the torque limiter go?
As close to the likely jam point as practical, usually on the output side after the gear reducer. Placing it there protects the most components, but the torque at that location is higher, so size the unit for it.