WHAT IS SIDE-LOADING AND HOW DOES IT AFFECT MY ACTUATOR?

In real-world applications, actuators may experience misalignment. When the load is not aligned with the axial force of the actuator, the result is side-loading, and it can drastically impact actuator performance and lifespan.

Understanding how side-loading affects different actuator technologies helps ensure longer service life, reduced maintenance, and more reliable motion control.

What Causes Side-Loading in Actuators?

Side-loading occurs when an actuator’s rod experiences force that’s not perfectly aligned with its axis of motion. Even small misalignments can cause uneven stress on internal components like bearings, screws, and seals.

These off-center forces can lead to premature wear, loss of precision, and eventually, actuator failure, especially if the system isn’t designed to handle side-loads.

How Different Actuator Technologies Respond to Side-Loading

Pneumatic Actuators

Pneumatic cylinders can tolerate minor side-loads, but extended exposure can degrade their seals and bearings.

• When side-loading occurs, the rod seal may lose integrity.
• Once compromised, it must be replaced, typically by swapping out the end cartridge.

Hydraulic and Hybrid Actuators

Hybrid and Hydraulic actuators are more robust under side-loading conditions. While side-loading can still cause wear on rod or piston seals, these components are field replaceable, allowing the actuator to be restored to full operation quickly. Both hydraulic and hybrid systems also provide built-in design methods to further minimize the effects of side-loading:

• Multiple rod support bearings distribute forces evenly across the rod.
• Stop tubes extend the rod, positioning the piston deeper within the housing for greater stability.
• Dual or longer pistons enhance guidance and reduce rod deflection under load.

Side-loading is an unfortunate factor in many applications, but its impact depends on the actuator technology and design. Understanding these differences allows you to choose an actuator that balances performance, maintainability, and long-term reliability.

For help evaluating side-loading or selecting the best hybrid actuator design for your application, connect with a Kyntronics engineer today.

Learn more about why Kyntronics is the clear actuation choice over alternative technologies.