Atlas Copco 80471.000009 Pneumatic Satellite Roller Screw Unit

The Atlas Copco 80471.000009 is a pneumatic satellite roller screw unit, also known as a planetary roller screw actuator. This compact device converts the rotary motion of a pneumatic motor into linear displacement with high force output and exceptional positional accuracy. It is commonly used in industrial applications requiring controlled clamping, pressing, riveting, and punching operations. The roller screw design ensures long service life and smooth operation under heavy loads.

Working Principle

Unlike conventional ball screws, the satellite roller screw uses multiple threaded rollers that orbit around a central screw shaft. The rollers engage with both the screw and a nut, providing a large contact area that distributes the load evenly. This results in higher load capacity, greater stiffness, and longer fatigue life compared to ball screws of similar size. The pneumatic motor drives the screw via a gear train, and the linear motion is guided by an internal anti‑rotation mechanism.

Key Specifications

• Maximum Linear Force: 50 kN (depending on air pressure)

• Stroke Length: 50 mm (standard)

• Linear Speed: Up to 50 mm/s

• Air Supply: 5‑7 bar (dry, filtered)

• Motor Type: Rotary vane, lubricated

• Repeatability: ±0.05 mm

• Weight: 4.5 kg

• Mounting: Flange or foot brackets

• Temperature Range: 0 °C to +60 °C

Construction and Materials

The unit is housed in a hardened steel cylinder with a corrosion‑resistant coating. The roller screw and nut are made of through‑hardened bearing steel, precision ground to achieve low friction and high efficiency. Seals prevent ingress of contaminants, and an integrated lubrication port allows periodic greasing.

Control and Operation

The pneumatic motor is controlled by a directional valve and flow regulators. Stroke position can be limited by external mechanical stops or by integrating a linear potentiometer or LVDT for feedback to a PLC. The unit can be operated in a push‑pull mode, and a return spring can be fitted for single‑acting applications.

Advantages over Hydraulic Systems

Compared to hydraulic cylinders, the roller screw unit offers cleaner operation (no oil leaks), easier maintenance, and more precise position control. It is also quieter and requires less infrastructure (no hydraulic power unit). The pneumatic drive allows variable speed and force by adjusting air pressure and flow.

Applications

Typical uses include automated press‑fitting operations, riveting machines, assembly of bearings and bushings, clamping fixtures for welding, and stamping of small metal parts. It is also used in packaging machinery for cutting and sealing operations.

Installation and Maintenance

Mounting can be achieved with four bolts on the front flange. Ensure proper alignment with the load. Air supply should be lubricated with a filtered oiler. Routine maintenance includes greasing the screw every 200 operating hours and checking seals for wear. The pneumatic motor may require vane replacement after several thousand hours.

Safety

Use a safety valve to exhaust air rapidly in emergency stops. Guards should be installed around the moving parts to prevent injury. The unit should be operated within the specified pressure and speed limits.

Integration with Automation

The unit can be equipped with sensors (proximity or magnetic) for end‑of‑stroke detection. It can be controlled by a simple manual valve or integrated into a fully automated sequence via PLC.

Benefits for Production

This pneumatic roller screw unit provides a cost‑effective alternative to hydraulic or electric linear actuators in applications requiring moderate force and precision. Its compact size and simple control make it easy to deploy in existing systems.

Conclusion

The Atlas Copco 80471.000009 satellite roller screw unit offers reliable, high‑force linear motion with the cleanliness and simplicity of pneumatic power. Its robust construction and accuracy make it a valuable component for numerous industrial automation tasks.