Inverted roller screw reduction gear

Abstract

The invention relates to planetary mechanisms for transmitting rotational movement. Particularly, the invention relates to planetary reducers having stepped threaded rollers. More particularly, the invention relates to roller reducers. The roller reducer comprises: an input member comprising at least two input member nuts having inner multi-start threads of different directions, said nuts fixed with respect to each other; a support member comprising at least two support member nuts having multi-start threads of different directions, said nuts fixed with respect to each other; an output member comprising at least two output member nuts having multi-start threads of different directions, said nuts fixed with respect to each other, wherein the output member nuts comprise a number of thread starts different from the number of thread starts on the support member nuts The roller reducer further comprises rollers comprising at least one pair of portions having threads of different directions; wherein the multi-start threads of the support member nuts and of the output member nuts are arranged on the outer surface thereof, the rollers are arranged around the at least two support member nuts and the at least two output member nuts in such manner that each roller portion out of at least one pair of roller portions engages at least one of the support member nuts and/or at least one of the output member nuts, and the at least two input member nuts are arranged around the rollers in such matter that the at least one pair of roller portions engages the threads of the input member nuts. The invention enables transmitting full rotation from the reducer output member without using an intermediate gear.

Dependencies are inferred from the claim text.