PLANETARY SCREW-NUT GEARING WITH LONG THREADED ROLLERS Russian patent published in 2008 - IPC F16H1/34 F16H25/20 

FIELD: mechanics.

SUBSTANCE: invention relates to mechanics and instrument making, particularly, to screw-rolling-nut gearings and can be used for precise conversion of rotary motion into translation, for example, in feed drives of machine tools, robots, measuring equipment and load-lifting devices. Propose planetary gearing incorporates long threaded rollers 2, sliding 3 and back 4 nuts. Rims 6, 7 fitted on the ends of rollers 2 are in mesh with rims 5 of the screw and epicycles of back nuts 4. Engagements feature maximum tolerable tooth pitch and maximum tolerable negative teeth bias on rollers 2 for continuous engagement in both external and internal gearing and ruling out teeth interference, cutting and sharpening to be provided for. Height of screw, back nut epicycle one roller end teeth is made complete and standard teeth, the roller end having equal number of thread starts over the thread entire length. Height of teeth on the roller other end is made so that the roller tooth apex diameter does not exceed thread OD when roller teeth are intersected by thread only at this very end.

EFFECT: higher lifting capacity and smoothness of gearing.

1 dwg