SCREW MECHANISM Russian patent published in 2007 - IPC F16H25/22 

FIELD: mechanical engineering.

SUBSTANCE: screw mechanism comprises screw made of a tubular rod provided with members for cooperation with the nut. The nut is provided with two-entrance passages. The members are made of the outer rollers. The rollers are mounted in pair at the ends of the axles that pass through the space of the tubular rod orthogonal to its longitudinal axis and diametrically opposite to its generatrices. The axles are rigidly connected with the walls of the rod and are distributed uniformly over the height of the rod at a distance one from the other. The distance is less than the height of the nut. The nut is set in bearings inside the housing on its bottom flange and is made of terminate member of the gearing electric drive that is also secured to the bottom flange. In the vicinity of the top housing flange, from inside, there are guiding ways for the rollers. The height of the ways exceeds the distance between the adjacent pairs of the rollers. The rollers are made of polyamide. The axles, tubular rod, and housing are made of carbon fiber reinforced plastic.

EFFECT: reduced mass and enhanced precision of the mechanism.

1 cl, 1 dwg