Direct-coupling clutch control system for an automatic transmiss

Details Direct-coupling clutch control system for an automatic transmiss Direct-coupling clutch control system for an automatic transmiss

1981-01-21

1984-02-14

Herrmann, Allan D.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 357, 74731, 74733, F16D 3300

Patent

active

044310960

ABSTRACT:
The automatic transmission comprises a torque converter having a pump, a turbine, a stator and a direct-coupling clutch adapted to engage the pump with the transmission casing, and a transmission gear having multiple forward gears and a reverse gear. A lockup control valve comprising a spool on which a governor pressure and the force of a spring act oppositely, and a switch valve adapted to change-over the oil-hydraulic circuits for the release or the engagement of the direct-coupling clutch, are provided for the oil-hydraulic control circuit of the automatic transmission. The direct-coupling clutch can become engaged only if the governor pressure should exceed a predetermined pressure and the transmission be in a select high speed range.

REFERENCES:
patent: 2824631 (1958-02-01), DeLorean
patent: 2824632 (1958-02-01), Lucia
patent: 3138971 (1964-06-01), Fisher
patent: 3330170 (1967-07-01), Rains
patent: 3505907 (1970-04-01), Fox
patent: 3985046 (1976-10-01), Morris
patent: 4095486 (1978-06-01), Ohnuma
patent: 4270636 (1981-06-01), Sunohara
patent: 4289048 (1981-09-01), Mikel
patent: 4294140 (1981-10-01), Iwanaga

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