ELECTRIC DRIVE ON THE BASE OF A GEAR WITH LONG THREAD ROLLS Russian patent published in 2007 - IPC F16H1/34 

FIELD: the invention refers to machine building and instrument making in particular to electric mechanical drives on the base of gears screw-rolling nut and may be used for transformation of rotary motion into translational motion.

SUBSTANCE: the electric mechanical drive has an electric engine and a gear with long thread rollers. The back nut 4 is fixed in the body of the gear and has a thread connection with a directing cylinder 8. The end face surface of the directing cylinder is pressed to the end face surface of the collar of the back nut 4 at securing perpendicularity in the given limits of these end face surfaces to the axles of their details. The sliding nut 3 is fulfilled in the shape of a united detail with a rod, whose length is no less than the maximum relocation bias of the sliding nut. The toothed epicycle 7 of the back nut is divided in the axial section on two separate toothed epicycles which are preliminary winded round relatively to each other before selection of gaps in the toothed engagements of the rollers and the epicycles. Inside the rod there is a second back nut 8, having on its end face surface a connection "cavity-lug" with the end face surface of the third toothed epicycle 11. The epicycle 11 is mated with the toothed rims of the rolls 6 and is fastened through of a bearing on the end of the screw.

EFFECT: reduces dimensions, weight and increases protection of the drive from exterior influences at high carrying capacity, longevity, rigidity, accuracy and evenness of the work the gear.

1 dwg