Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1983-03-11
1987-07-21
Staab, Lawrence J.
Machine element or mechanism
Gearing
Directly cooperating gears
74441, 74459, 384 43, 384516, F16H 118, F16H 120
Patent
active
046809821
ABSTRACT:
A spindle or leadscrew and an associated nut, forming part of a driving assembly of the circulating-ball type, have helical threads of symmetrical profiles in the shape of pointed arches whose flanks engage the recirculating balls along respective helical contact lines. With the spindle virtually non-deformable in the axial direction, the pitch of its thread exceeds that of the nut thread (in the absence of stress upon the latter) by a small differential--specifically 0.02%--lying well within the limits of elastic axial deformability of the nut. Upon rotation of the spindle relative to the nut for the transmission of an axial force, this differential results in an approximately uniform stress distribution among the sets of balls lying in confronting turns of the spindle and nut threads.
REFERENCES:
patent: 2936645 (1960-05-01), Morris et al.
patent: 3198029 (1965-08-01), Orner
patent: 3393577 (1968-07-01), Better
patent: 3563107 (1971-02-01), Nilsson
patent: 3902377 (1975-09-01), Lemor
patent: 4198872 (1980-04-01), Metz
patent: 4364282 (1982-12-01), Nilsson
"Rechnergestutzte Auslegung Und Berechnung Von Kugelgewindespindeln" by H. Hilmer, published in vol. II of Fertigungstechnische Berichte, 1978.
Korthaus Helmut
Wilke Richard
Dubno Herbert
Ross Karl F.
Staab Lawrence J.
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