Machine element or mechanism – Gearing – With fluid drive
Patent
1988-07-11
1989-10-31
Braun, Leslie A.
Machine element or mechanism
Gearing
With fluid drive
74868, 192 33, 192 331, F16H 4700, F16D 3300, F16D 3500, F16D 3700
Patent
active
048769231
ABSTRACT:
A torque converter lockup clutch is pressurized from a source of regulated line pressure through a lockup clutch control valve, which directs pressure to either of two passages to apply and release the clutch. The control valve is supplied with control pressure from a solenoid-operated valve that produces high and low fluid pressure states corresponding to commands to engage and release the lockup clutch. A second control pressure, opposing the effect of the solenoid-operated control pressure, is applied to the control valve when the vehicle operator manually selects certain gear ratios, principally the lowest forward and reverse gear ratios. A line pressure regulator valve produces line pressure whose magnitude is proportional to the magnitude of a control pressure representing a commanded engine torque output. The pressure produced when the vehicle operator manually selects low gear ratios is applied also to the main regulator valve, which produces a line pressure that varies linearly with engine torque control pressure and increases, in comparison to line pressure at all other gear ratios, when low gear ratios are selected. A converter regulator valve limits the level of line pressure directed by the main regulator valve to the converter clutch control valve.
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U.S. Serial No. 24,500, filed Mar. 11, 1987.
U.S. Serial No. 927,624, filed Nov. 6, 1984.
Crandall Scott R.
Droste Timothy A.
Rosen Stanley D.
Braun Leslie A.
Ford Motor Company
Gehris William
Harrington Donald J.
McKenzie Frank G.
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