Motion Technologies planetary roller screws

Planetary roller screws are available from Motion Technologies in sizes ranging from 8 to 25 mm diameter, 1 to 10 mm lead and 1.9 to 36 kN load ratings. The device consists of a screw and nut with several planetary rollers parallel to the axis between the screw and nut.

The rollers have many points of contact with the screw and roller nut, providing two to three times the stiffness of similarly sized ball screws without significantly increasing friction or decreasing efficiency. The contact geometry also improves shock resistance and increases static and dynamic thrust-load capacities by a factor of 3 to 5 over comparable ball screws. The expected service life for a given load is increased by up to 15 times.

The rollers in the screw are always in contact and do not circulate in and out of the nut. The multitude of contact points of the planetary rollers can carry large loads and provide high resolution (small axial movement). The screws produce high rotational speeds up to 6500 rpm.

The screws are suitable for high-precision, high-speed, heavy-load, long-life and heavy-use applications.