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25/09/2019 - 26/09/2019

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High acceleration, high load and smooth running

High acceleration, high load and smooth running A planetary roller screw is a rolling system consisting of a threaded shaft (screw) and a nut that, internally threaded too, contains a determined number of threaded rolls with gears on the ends. The roller engages its threads with the screw and the nut and it is guided in its orbiting motion by two timing ring gears placed at each end of the nut.

The planetary roller screw is, as the ballscrew, a rolling element device but not limited by the presence of balls, typical of ballscrews. It provides more contact points within a given volume than a ballscrew, and so can be more compact for a given load capacity while providing similar levels of efficiency at low to moderate speeds, and maintaining that efficiency at high speeds.

The roller screw is constructed from a screw shaft, a nut, and the planetary roller. The screw provides a helical raceway for multiple rollers radially arrayed around the nut. The rollers spin in contact with the screw and the nut. They orbit the nut when they spin. Rotation of the nut results in screw travel, while rotation of the screw results in nut travel.

Roller screws can surpass ballscrews in regard to positioning precision, load rating, rigidity, speed, acceleration and lifetime. Robust and ideally suited for use in industrial environments, roller screws offer high acceleration rates, smooth operation and the highest levels of flexibility in terms of design and performance range. They are characterised by extremely quiet operation, which makes them suitable for use in low disturbance and low noise applications. The smoothness of operation also ensures low vibration.

Roller screws meet the needs of applications requiring high precision, high speed, heavy load, heavy use and long life. Because the design spreads the load over more contact points than with a ballscrew, the result is much longer life. Typical applications include motion and positioning systems in industrial machines, heavy industry, aerospace, automotive test and simulation, nuclear engineering, medical equipment, metal forming machinery and presses, blow moulding and injection moulding machinery, food processing, laser tracking, and robotics. Pre-loaded split nuts and double nuts enable backlash to be eliminated.

Moog has over 30 experience in producing and designing customised high precision ball and planetary roller screws that are suitable for a variety of markets and challenging motion applications. Developed to meet the needs of leading edge machine manufacturers across a wide range of markets, Moog's extensive range of planetary roller screws enable customers to find the best solution to their specific performance requirements that meet the demands of ISO 3408 accuracy for classes
3, 5 and 7.

The range covers a wide selection of static and dynamic loads, an extended range of accelerations up to extremely fast duty cycles, whilst meeting even the most demanding noise and vibration requirements, even in very quiet applications.

Moog roller screws are available in lengths up to 1800mm. Dynamic load capacity is up to 670kN, while static load capacity is up to 1400kN. Maximum acceleration is up to 40m/s2. A wide selection of screw end shafts is available, and extensive nut customisation is possible, such as variations in shape, flange and coupling, along with special machining processes. Various materials and lubrication operations are available.
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