192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1977-01-12
1979-03-06
Coan, James F.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
74866, B60K 4104
Patent
active
041426134
ABSTRACT:
A downshift control apparatus for biasing a shift valve of a hydraulic control system of an automatic power transmission of an automotive vehicle toward a downshift position for raising the transmission gear shift points during kickdown or sudden deceleration condition of the vehicle, featuring a downshift valve which includes a valve spool movable between a first position passing a control fluid pressure to the shift valve and a second position discharging the fluid pressure from the shift valve, wherein the valve spool is urged toward the first position by the force of a spring and a fluid pressure developed in the valve in response to a kickdown condition or a sudden deceleration condition of the vehicle and toward the second position by a fluid pressure varying with the power output of the engine and a force resulting from a fluid pressure which acts on a differential pressure-acting area of the valve spool when the valve spool is held in or moving toward the second position thereof.
REFERENCES:
patent: 2872000 (1959-02-01), Herndon et al.
patent: 3523597 (1970-08-01), Lemieux
patent: 3700079 (1972-10-01), Shirai et al.
patent: 3974720 (1976-08-01), Iijima
Coan James F.
Nissan Motor Company Limited
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