Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1987-04-17
1988-08-09
Wright, Dirk
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74714, 74715, 74674, 180 628, F16H 144, F16H 3706
Patent
active
047620226
ABSTRACT:
A differential drive assembly incorporates the use of two separate and essentially parallel output drive shafts, each receiving torque through separate differential gear clusters from separate spur drive gears, which receive input power, from a transmission. Each spur drive gear is attached to an input gear of a differential gear cluster and both gears are rotatably mounted on the output shaft for that gear cluster. The differential gear clusters drive the output shafts. A control gear of each differential gear cluster, which controls the output ratio of the connected gear cluster is attached to a worm and each control gear and attached worm are also rotatably mounted on the respective output shaft. The rotation of the control gears and worms is controlled by a worm gear situated between and engaged with both worms and rotatably mounted in the gear case on an axis perpendicular to the plane of the axes of the worms. The worm gear thus engaged with both worms allows rotation of the worms only when both worms rotate, and in opposite directions. The engagement of the worms with the worm gear as used in the differential drive assembly therefore provides: (1) control of the control gear of each differential gear cluster allowing transmission of torque to the axles; (2) control of balanced proportionate differentiated drive, by allowing the worms to rotate in opposite directions; (3) control of the dissipation of torque especially, using the irreversible drive feature of worm-worm gear engagement. Available torque is therefore retained, continuously proportioned, and utilized, that is, torque is never dissipated but directed to and used by the wheel or wheels (in 4-wheel drive) which can use it most effectively.
REFERENCES:
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patent: 2209367 (1940-07-01), Watson
patent: 2342755 (1944-02-01), Randal
patent: 2666343 (1954-01-01), Casa-Masa
patent: 2761332 (1956-09-01), Gray et al.
patent: 2780299 (1957-02-01), Matson
patent: 2859641 (1958-11-01), Gleasman
patent: 2898779 (1959-08-01), Mickelson
patent: 3220284 (1965-11-01), Horvath
patent: 3651712 (1972-03-01), Davis
Mike Bargo, "The Strange Geometry of Gleason's Impossible Differential", Popular Science, pp. 58-61, Feb. 1984.
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