Satellite roller screw transmits high loads
An
Abssac product story
Edited by the Engineeringtalk editorial team
Nov 6, 2007
The many points of contact give a satellite roller screw greater rigidity and shock tolerance than a ball screw without a compromise in friction or efficiency.
Abssac has released a satellite roller screw that allows users to transmit more load without altering the size of the ball nut.
The satellite roller screw is similar to the ball screw design, but the load transfer elements are threaded rollers.
The satellite roller screws have a high number of points of contact to support the load.
Their admissible static and dynamic load capacities are considerably higher.
The many points of contact give a satellite roller screw greater rigidity and shock tolerance than a ball screw without a compromise in friction or efficiency.
The admissible Hertz pressure is the same for satellite roller screws as for ball screws, but with satellite roller screws the static load can be three times greater than that of ball screws and their lifespan is 15 times longer.
Satellite roller screws can also rotate much faster and support much greater acceleration as there is no recycling of ball bearings.
In affect, the roller screw mechanism can handle twice the rotation speed of a ball screw.
Planetary roller screws can be supplied with smaller leads than ball screws.
As the lead is a function of the pitch of the planetary roller screw, the lead can be under 0.5mm.
The lead can be chosen and supplied without any geometrical changes of both the screw shaft and the nut body.
In a ball screw the lead is limited by the outside diameter of the bearing ball.
Satellite roller screws are suitable for applications where high axial loads, high speed and high feed speeds are needed.
Chris Cattle, in the Technical Sales Department at Abssac said, "If an application requires a high linear load to be repeatedly moved at speed but the design is constrained by space, the satellite roller screw program is ideal".
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