Precision Gearboxes for Highly Dynamic Applications

High-dynamic applications place high demands on the precision gears used. These must operate reliably even under high accelerations, short cycle times, and frequent load changes, while delivering high repeatability and transmission accuracy and enabling precise positioning.

What requirements do highly dynamic applications place on precision gearheads?

Low backlash and high torsional rigidity are particularly crucial for precise and stable positioning. A low moment of inertia also facilitates rapid acceleration and deceleration. Furthermore, the gearboxes must be able to transmit high dynamic torques and safely absorb short-term peak loads, such as those occurring during abrupt changes in direction or emergency stop procedures.

Lubrication also has a significant impact on performance and service life. The lubricant must be tailored to the gearbox design, speed, load, and operating temperature. Properly selected and optimally sized lubrication reduces friction and wear, limits heat generation, and helps maintain the gearbox’s precision and performance even under high dynamic loads.

Key requirements:

• Low backlash—ideally even zero backlash
• High torsional rigidity
• Low moment of inertia
• High dynamic torques
• High load capacity under frequent load cycles
• High overload capacity
• High transmission and repeatability accuracy
• High efficiency
• Long service life

Design Based on Motion and Load Profiles

When designing a system, it is not sufficient to consider only the rated torque. The entire motion and load profile is decisive. This includes acceleration and deceleration times, rotational speeds, peak torques, load cycles, duty cycle, and potential emergency stop or collision events. These factors determine which gearbox type, size, and reduction ratio are suitable to ensure the required dynamics, precision, and service life.

Design Challenges:

• High mechanical stress due to frequent load and direction changes
• Heat generation at high speeds and short cycle times
• Vibrations and positional deviations resulting from elastic deformations
• Short-term load peaks during acceleration, braking, and emergency stop events
• Conflicting requirements between dynamics, precision, installation space, weight, efficiency, and service life

Which drive concepts are suitable for highly dynamic applications?

Strain wave gears, cycloidal gears and precision planetary gears are particularly well-suited for highly dynamic applications. Direct drives can also be a suitable gearless alternative. These concepts prioritize different factors in terms of dynamics, backlash, torsional rigidity, moment of inertia, load capacity, reduction ratio, efficiency, and installation space. Which solution is best suited depends on the specific load case, the available installation space, the motion profile, and the requirements for accuracy, dynamics, and service life.

Comparison: Drive Concepts for Highly Dynamic Applications

The overview shows typical characteristics of the various drive concepts. The specific properties vary depending on the series, size, reduction ratio, and installation situation.

What advantages do Nabtesco’s precision gears offer in highly dynamic applications?

Nabtesco’s precision gears enable fast and precise movements even at high speeds, with rapid acceleration, under heavy loads, and with frequent load changes. Strain wave gears are characterized by zero backlash, low weight, high torque capacity, and a compact design. The virtually backlash-free cycloidal gears offer high torsional rigidity, robustness, and shock resistance, with backlash remaining extremely low even over long periods of time. Both technologies support short cycle times, precise positioning tasks, and high requirements for process reliability.

Typical applications for highly dynamic precision gears:

• Industrial robots and Cobots
• Pick-and-place, handling, feeding, and assembly systems
• Machine tools, particularly rotary tables, swive axes, and machining heads
• Packaging machines
• Positioning and servo axes
• Wafer-handling systems
• Medical robotics and medical devices
• Humanoid robotics

Would you like to learn more about the benefits of our precision gearboxes in highly dynamic applications, or do you have questions about a specific project? Our experts are here to assist you with design and integration. Contact us now!