Machine element or mechanism – Elements – Gear casings
Patent
1987-10-19
1989-04-25
Wright, Dirk
Machine element or mechanism
Elements
Gear casings
74682, F16H 4704, F16H 3706
Patent
active
048236403
ABSTRACT:
Variable-ratio transmission configurations are derived from a basic balanced-reaction configuration which is known to operate with inherently lower power flow in the reactive path for a given ratio range than the more common split-input or split-output configurations. A pair of planetary gear sets having different base speed ratios, are configured to each provide a power transmission path from the input shaft to the output shaft while the reaction gear elements are cross-coupled to each other through an auxiliary variable ratio power-transfer device. A particular two-planetary-set configuration uses the ring gear elements as the reactors, one mounted to rotate around the input shaft and the other mounted to rotate around the output shaft. The ring gears are thus readily coupled to an auxiliary variable ratio power-transfer device, which may be a pair of hydraulic pump/motors. For extended ratio range, three or more (n) differential gear sets are configured in parallel input/output power paths, to be selected in pairs in (n-1) different ratio ranges for connection through automatic hydraulic or clutch-type range-switching means acting in the reaction power paths. In a "nested" configuration for superior overall power efficiency resulting from reduced reaction path power losses, a first, high power two-differential-set balanced-reaction transmission utilizes in its reaction path a second, medium power two-differential-set balanced reaction transmission, so that the power-handling requirements of the second transmission's variable ratio power-transfer device may be made very low.
REFERENCES:
patent: 2808737 (1957-10-01), Bullard III
patent: 2830468 (1958-04-01), Waring
patent: 2914965 (1959-12-01), Matz
patent: 2917948 (1959-12-01), Nussbaumer
patent: 2972905 (1961-02-01), Bullard III
patent: 3023638 (1962-03-01), Westbury et al.
patent: 3204486 (1965-09-01), DeLalio
patent: 3455183 (1969-07-01), Orshansky
patent: 3470769 (1969-10-01), Livezey
patent: 3869939 (1975-03-01), Miyao
patent: 4354400 (1982-10-01), Baker
patent: 4690016 (1987-09-01), Whalen
Macris Harold F.
McTaggart J. E.
Wright Dirk
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