Circulating ball worm drive

Machine element or mechanism – Gearing – Directly cooperating gears

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Details

74459, 744248R, F16H 118, F16H 120, F16H 5508

Patent

active

046128174

ABSTRACT:
To facilitate manufacture of accurately formed tracks (6) within a circulating nut (10) on a spindle (1), the nut is formed with insert strips (4) shaped to receive the balls (3), the insert strips defining said track and, for example, being formed as part semi-circular trough-like sheet steel elements bent into spiral form, with circulating return portions (7) for the balls formed in either the nut, or extending from, and joining adjacent terminal portions of the strips. To prevent loss of balls, an elastic, e.g. plastic tape (189) with laterally projecting wings (19) is positioned between the tracks (6) defined by adjacent strips, partly overlapping the balls (3) in the tracks, additionally providing reservoirs for lubricant and excluding contamination of the track within the nut by dirt, grit and the like.

REFERENCES:
patent: 2450282 (1948-09-01), Jackson
patent: 2895343 (1959-07-01), Orner
patent: 3009367 (1961-11-01), Striggow
patent: 3198029 (1965-08-01), Orner
patent: 3393575 (1968-07-01), Irwin
patent: 3393576 (1968-07-01), Carlson
patent: 4074587 (1978-02-01), Brusasco
patent: 4186620 (1980-02-01), Brusasco
patent: 4274297 (1981-06-01), Blurock et al.
patent: 4364282 (1982-12-01), Nilsson
patent: 4474073 (1984-10-01), Blaurock et al.

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