FIELD: mechanical engineering. SUBSTANCE: automatic control and taking-up of backlash between screw, rollers and nut are effected due to radial deformation of pliable element of nut. To this end, nut is provided with circular hermetic cavity filled with liquid or plastic agent, for example, PVC paste. Inner wall of this cavity is made in form of thin-walled cylindrical envelope which is deformed radially under action of pressure crated in this cavity. EFFECT: enhanced efficiency. 3 dwg
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