Long-Lasting Torque Limiter

Feb. 8, 2007
Mechanical torque limiters provide relatively low-cost insurance in case of torque overloads due to jams and crashes.

They protect downstream machinery and tools. But with ball-detent limiters, a commonly used design for emergency protection, every overload causes wear. Most don't survive more than 2,000 overloads before needing to be replaced. This makes them ill-suited for applications in which overloads are an integral part of a process.

The ESL limiter from R+W America, Bensenville, Ill. (rw-america.com), uses a principle borrowed from air ratchets to survive significantly more overloads before wear becomes a problem.

The ESL uses spring-loaded ball bearings that snap out of alignment when torque exceeds the spring's force. But instead of slamming into a conical detent, the bearings roll over another layer of roller bearings nested beneath the first. This second layer of bearings reduces impact and distributes forces evenly over both sets of bearings, resulting in less wear and longer life. The device handles overloads from 0.1 to 1,000 Nm and shafts with bore diameters of 3 to 70 mm. And a frictional clamping hub can replace the keyed connector to provide zero backlash.


Sponsored Recommendations

The entire spectrum of drive technology

June 5, 2024
Read exciting stories about all aspects of maxon drive technology in our magazine.


May 15, 2024
Production equipment is expensive and needs to be protected against input abnormalities such as voltage, current, frequency, and phase to stay online and in operation for the ...

Solenoid Valve Mechanics: Understanding Force Balance Equations

May 13, 2024
When evaluating a solenoid valve for a particular application, it is important to ensure that the valve can both remain in state and transition between its de-energized and fully...

Solenoid Valve Basics: What They Are, What They Do, and How They Work

May 13, 2024
A solenoid valve is an electromechanical device used to control the flow of a liquid or gas. It is comprised of two features: a solenoid and a valve. The solenoid is an electric...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!