ball screw

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ball screw

[′bȯl ‚skrü]
(mechanical engineering)
An element used to convert rotation to longitudinal motion, consisting of a threaded rod linked to a threaded nut by ball bearings constrained to roll in the space formed by the threads, in order to reduce friction.
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References in periodicals archive ?
The first is the column drive unit which is mounted on the steering column inside the passenger compartment and the second is the belt drive where the assist is applied to the rack through a belt and ball nut mechanism.
Beaver will utilize high-strength stainless steel for the ball screw and ball nut to minimize corrosion as an alternative to chrome plating.
The All Whites had an edge in the scrums and both sides generally won their own lineout ball nut Currie had some real pace behind with Andy MacMahon proving a real handful for the Swansea defence.
Thus, the steering system features a ball nut to provide dampening, a compact belt-drive system to efficiently transfer torque from the electric motor to the column (it is capable of 10 kN and 360[degrees]/second), and steering torque compensation software to help counter and compensate for torque steer.
By using balls manufactured from silicon nitride instead of tool steel, microwelding in the ball nut is eliminated.
The primary ball nut included a 17inch diameter mounting flange and involved removing 800 pounds of material to reach the final size.
The housing enables a timing belt to drive the nut and contains the preloaded rotating ball nut assembly.
The former places the power unit on the steering column just behind the instrument panel where the assist is transmitted through a worm gear to the column, while the latter places it to the side and drives the column through a ball nut mechanism via a rubber belt.
Finally, the FAA has adopted a new AD that is applicable to certain Airbus A330 and A340 series aircraft, requiring repetitive inspections to detect discrepancies of the transfer tubes and the collar of the ball nut of the trimmable horizontal stabilizer actuator, and corrective action if necessary.