192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch
Patent
1984-11-21
1986-02-25
Krizmanich, George H.
192 clutches and power-stop control
Vortex-flow drive and clutch
Including drive-lockup clutch
192 357, B60K 4122
Patent
active
045723389
ABSTRACT:
In a hydraulic control system for automatic transmissions of motor vehicles, a lock-up control circuit for controlling a direct-coupling clutch of a torque converter, the lock-up control circuit comprising: a lock-up control valve having a spring-biased valve spool and operated by solenoid pressure applied to a spring-loaded end of the valve spool and oil pressure applied to the other end of the spool upon shift to a predetermined gear position and in higher gear positions, connecting an oil pressure source with either a clutch engaging conduit or a clutch releasing conduit of the direct-coupling clutch of the torque converter; with ON-OFF operation of solenoid valve; and a solenoid valve provided in an oil conduit communicating with the spring-loaded end of the spool and adapted to produce the solenoid pressure in a gear position lower than said predetermined lock-up gear position.
REFERENCES:
patent: 3252352 (1966-05-01), General et al.
patent: 3693478 (1972-09-01), Malloy
patent: 4367812 (1983-01-01), Kobayashi et al.
patent: 4428467 (1984-01-01), Hiramatsu
patent: 4431095 (1984-02-01), Suga
Aisin-Warner Kabushiki Kaisha
Krizmanich George H.
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