Freewheels and torque limiters: what they do, where they are used and how to choose them

Freewheels are mechanical components that transmit torque in one direction of rotation and spin freely in the opposite direction. They are also known as one-way clutches or freewheel clutches. Their operating principle is based on locking elements, such as rollers or ratchets, that engage or disengage depending on the direction of rotation.

Torque limiters, on the other hand, protect the drive against overloads. When the torque exceeds a preset value, they disconnect or slip to prevent damage to the machinery. They are an essential safeguard in equipment where a jam or blockage could cause costly breakages.

Both components are integrated into power transmission systems and are selected according to torque, speed and mounting conditions. At MR Accesorios Industriales we work with freewheels and torque limiters from recognized brands such as INA, RINGSPANN and TSUBAKI, and we advise you to find the right solution.

Freewheels are used in a wide variety of machines. In conveyors, they allow movement in one direction only and prevent the load from rolling back. In dual-drive systems, such as pumps or fans with a backup motor, they allow the main motor to drive without dragging the secondary one.

They are also common in indexing and overrunning applications, where a shaft needs to rotate freely at a higher speed than the drive mechanism. For example, in machine tools or in combustion engine starters.

In Argentine industry, they are used in packaging lines, conveyor belts, elevators and agricultural machinery. The choice of the correct freewheel depends on the torque to be transmitted, the free rotation speed and the type of mounting (on shaft, in housing, etc.).

Torque limiters are installed between the motor and the load to protect the drive. They are indispensable in machinery where jams can occur, such as crushers, mixers, extruders or material handling systems. In the event of an overload, the limiter disconnects or slips, preventing damage to gears, chains and motors.

There are different types: friction, ball, roller and magnetic. Friction types are simple and economical, but can wear; ball types offer more precise disconnection and no residual slip. The choice depends on the required precision and the working environment.

In applications with frequent starts or variable loads, a well-selected torque limiter reduces unplanned downtime and extends equipment life. At MR Accesorios Industriales we help you define the appropriate trip torque and the model that best suits your machine.

To select a freewheel, you first need to determine the maximum torque it must transmit and the free rotation speed. It is also important to know the shaft diameter and the available space. Freewheels can be mounted directly on the shaft, in a housing or as part of an assembly with bearings.

Brands offer series with different capacities. For example, INA has needle freewheels such as the HF series, RINGSPANN offers models such as the FN, and TSUBAKI has the MZ series. Each has specific characteristics of torque, speed and lubrication.

At MR Accesorios Industriales we sell freewheels from these brands and advise you on selection. You can send us the code, the measurement or a photo of the part to be replaced, and we will quote the right option.

Selecting a torque limiter begins by defining the desired trip torque, which must be greater than the normal working torque but less than the torque that would damage the drive. You must also consider the rotation speed, the type of coupling and the environment (temperature, dust, humidity).

Limiters can be automatic or manual reset. Automatic reset types re-engage by themselves when the overload disappears, while manual ones require operator intervention. The choice depends on the application and safety protocols.

Brands such as RINGSPANN and TSUBAKI offer high-quality torque limiters. For example, RINGSPANN has the PA series and TSUBAKI the TGM series. At MR Accesorios Industriales we help you size the correct limiter and quote it promptly.

We work with freewheels and torque limiters from INA, RINGSPANN and TSUBAKI. Some reference codes are FN 8, FN 60, MZ17, MZ35, HF1012-KF and HF0612-KF for freewheels, and PA 50, PA 75, TGM3 and TGM6 for torque limiters.

These codes correspond to specific models with defined capacities. If you have the code of the component you need to replace, you can send it to us and we will quote the equivalent or the most convenient alternative.

Also, if you are not sure of the model, you can send us a photo of the part or the main measurements, and we will indicate the right option.

Freewheels and torque limiters require minimal maintenance, but it is important to follow the manufacturer's recommendations regarding lubrication and adjustment. Inadequate lubrication can cause premature wear or locking failures.

In the case of torque limiters, it is essential to periodically verify that the trip torque is still correct, since it can vary with use. An incorrect setting can leave the drive unprotected or cause untimely trips.

At MR Accesorios Industriales we advise you on maintenance and spare parts selection. If you need to replace a freewheel or a torque limiter, contact us via WhatsApp or email with the code, the measurement or a photo, and we will quote you promptly.