Roller screw system

A roller screw system, comprising:

• a. a cylindrical nut body with a center bore, said center bore having internal helical grooves and a circumferentially extending cross-over region wherein said helical grooves extend radially outward and extend axially;
• b. a shaft with external helical threads formed thereon, said shaft being disposed longitudinally inside said center bore of said nut body;
• c. a plurality of rollers disposed inside said center bore and aligned radially around said shaft, each said roller including two opposite axles and a plurality of non-helical grooves formed thereon capable of engaging said helical grooves on said nut body;
• and,
• d. at least one compression ring located inside said nut body and around said shaft, said compression ring being located inside said rollers and press against said axles on said rollers to continuously force said rollers outward so that said non-helical grooves on said rollers maintain engagement with said helical grooves on said cross-over region on said nut body as said nut body and said shaft are rotated relative to each other.

A roller screw system, comprising:

• a. a cylindrical nut body with a center bore, said center bore having internal helical grooves and a circumferentially extending cross-over region wherein said helical grooves extend radially outward and deflect axially;
• b. a shaft with external helical threads formed thereon, said shaft being disposed longitudinally inside said center bore of said nut body;
• c. a plurality of rollers disposed inside said center bore and aligned radially around said shaft, each said roller including two opposite axles and a plurality of non-helical grooves formed thereon capable of engaging said helical grooves on said nut body;
• and,
• d. at least one cam ring for continuously forcing said axles on said rollers outward to engage said cross-over region on said nut body, said cam ring being located around said shaft and said axles on said rollers, said cam ring including means to couple said cam ring to said nut body to prevent rotation therein and a lobed region aligned on said cam ring to force said rollers into contact with said helical grooves in said cross-over region as said nut body and said shaft are rotated relative to each other.