Drive unit

Machine element or mechanism – Mechanical movements – Rotary to intermittent unidirectional motion

Patent

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Details

74785, 74436, 74394, F16H 2704

Patent

active

044520930

ABSTRACT:
A positive planetary drive having zero backlash interconnects coaxial input and output shafts in a drive unit. A plurality of rollers orbiting about the input shaft is always entrapped in rolling contact with a plurality of wedges supported by the output shaft. Cams in the drive unit provide cam surfaces contacted by orbiting rollers on the input shaft to provide a continuous constant velocity output motion at a speed which is less than the input motion. Intermittent motion is provided by cam surfaces engaged by the same rollers which contact the wedges. A gear drive engaged with a cam plate used to form the various cams provides a variable angular relationship between the input shaft and the output shaft. Protection against a torque overload at the output shaft is provided by permitting plungers to rotate with the cam plate when disengaged from seats supported by the housing.

REFERENCES:
patent: 2986949 (1961-06-01), Lancaster et al.
patent: 3379034 (1968-04-01), Gustafson
patent: 3546897 (1970-12-01), Kenny
patent: 3563101 (1971-02-01), Kinnicutt
patent: 3820411 (1974-06-01), Rudolph
patent: 3848472 (1974-11-01), Pim
patent: 3893553 (1975-07-01), Hansen
Mechanism for Intermittent Motion; New York, New York; Industrial Press, Inc. 1972; pp. 139-151; John H. Bickford.

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