Machine element or mechanism – Elements – Gear casings
Patent
1984-08-20
1985-12-10
Bonck, Rodney H.
Machine element or mechanism
Elements
Gear casings
74714, 74731, F16H 4704
Patent
active
045571600
ABSTRACT:
A hydraulic differential transmission utilizing an input differential and having a hydrostatic transmission with a variable output speed to the input differential whereby the speed of the transmission drive output can be maintained constant with variable drive input speeds to the transmission. The hydraulic differential transmission has a pair of parallel drive trains between the drive shaft of the fixed displacement unit of the hydrostatic transmission and the input differential, with the two drive trains providing different drive ratios therebetween. A first drive train including an overrunning clutch provides a one to one drive ratio therebetween when operating at higher drive input speeds. The other drive train includes a second differential and a second overriding clutch providing a lesser drive ratio between the fixed displacement hydraulic unit and the first differential when operating at lower drive input speeds. The overrunning clutches enable a shift between drive trains at a shift point where the drive shaft of the fixed displacement hydaulic unit changes direction of rotation without any discontinuity in the drive at the shift point. The change in drive ratios for operation at the higher drive input speeds causes the hydraulic units of the hydrostatic transmission to operate at higher pressures and nearer their normal pressure capabilities.
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Bonck Rodney H.
Diehl Dwight G.
Sundstrand Corporation
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