Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1996-07-29
1998-09-22
Marmor, Charles A.
Machine element or mechanism
Gearing
Directly cooperating gears
74459, F16H 118, F16H 2522
Patent
active
058098372
ABSTRACT:
A roller screw assembly includes a threaded rod, a nut having internal, non-helical grooves and a plurality of externally grooved elongated rollers seated circumferentially about the rod and captured in place by the nut. The grooves in the nut and rollers are selected to have the same spacing as the pitch of the rod threads and with a corresponding profile so as to allow intermeshing engagement between the nut, rollers and rod. The inner surface of the nut is formed such that a cross-section normal to the axis of the rod illustrates at least one lobed area which is of sufficient extent to allow a roller in that area to translate axially with respect to the rod. The number of lobes is dependent on the number of threads or parallel helices formed on the rod. Rotation of the nut with respect to the rod enables axial translation of the nut with respect to the rod by recirculation of the grooved rollers at the lobed region.
REFERENCES:
patent: 2683379 (1954-07-01), Strandgren
patent: 4048867 (1977-09-01), Saari
patent: 4050319 (1977-09-01), Stanley
patent: 4576057 (1986-03-01), Saari
patent: 5022277 (1991-06-01), Shaffer
Beusse James H.
Grabow Troy
Marmor Charles A.
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