Fluid drive transmission employing lockup clutch

Details Fluid drive transmission employing lockup clutch Fluid drive transmission employing lockup clutch

1982-09-27

1985-07-02

Krizmanich, George H.

192 clutches and power-stop control

Transmission control and clutch control

Common control

192 362, 192 0092, 192 331, 192103R, 74732, B60K 4122

Patent

active

045262551

ABSTRACT:
A transmission system particularly useable for transmitting power from an internal combustion engine to the driving wheels of a vehicle such as a tractor. The system includes a multiple ratio mechanical range transmission coupled to a speed transmission via a manually operable master clutch. A high slip fluid coupling is used to couple the speed transmission to the engine, and an electronically controlled lockup clutch locks the impeller of the fluid coupling to the output turbine of same when the speed of the engine exceeds a first predetermined speed, and maintains the coupling locked until the speed of the engine drops below a second substantially lower predetermined speed; the difference between the predetermined speeds is due to a speed comparator hysteresis which serves to prevent hunting during automatic gear shifts between different ratios.

REFERENCES:
patent: 2970482 (1961-02-01), Strehlow et al.
patent: 3390594 (1968-07-01), Gillespie
patent: 3442346 (1969-05-01), Winter et al.
patent: 3783985 (1974-01-01), May
patent: 3805640 (1974-04-01), Schneider et al.
patent: 3861241 (1975-01-01), Hancock
patent: 3944035 (1976-03-01), McRay
patent: 4027554 (1977-06-01), Ito et al.
patent: 4373619 (1983-02-01), Schritt et al.

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