ANTIBACKLASH GEARING Russian patent published in 1997 - IPC

FIELD: mechanical engineering; conversion of rotary motion into rotary motion at high accuracy and large gear ratio. SUBSTANCE: helical gearing includes screw 2, two nuts 4 and 5 engageable with this screw, rolling solids of revolution located in channels of screw and nuts and devices for fixation of negative allowance, driven pulley 8, flexible member 7 embracing pulley 8 which is secured on outer surface of one of nuts and tensioner 9 connected with flexible member 7. This gearing ensures backlashless rotation of driven pulley at reverse rotation of screw. EFFECT: avoidance of backlash. 1 dwg