192 clutches and power-stop control – Vortex-flow drive and clutch – Fluid-pressure operator for engaging clutch
Patent
1977-12-21
1980-10-14
Krizmanich, George H.
192 clutches and power-stop control
Vortex-flow drive and clutch
Fluid-pressure operator for engaging clutch
F16D 3900
Patent
active
042275970
ABSTRACT:
A hydraulic control system for a hydrodynamic/mechanical transmission with hydraulically actuated clutches for selecting the "gears" or "speeds" of the mechanical transmission comprises a hydraulic-pressure source, e.g. a pump connected with the crank shaft of an engine, delivering hydraulic fluid to the clutches via a main pressure line. The pressure in this line is controlled by a main pressure valve such that the excess fluid is supplied to the feed line of the hydrodynamic unit of the hydrodynamic/mechanical transmission, e.g. a torque converter or fluid coupling. At higher fluid excesses in the main pressure line, the hydraulic fluid is bypassed to the intake side of the source between a filter and the pump. The system includes a further pressure valve which constitutes the pressure control valve for the hydrodynamic unit, the latter valve having only two controlled ports and being free from any port connected to the reservoir. The pressure-regulating valve of the hydrodynamic unit acts against a spring and receives the pressure at the intake side of the hydrodynamic unit which is effective against the force of the spring and tends to bias the valve member or spool of this pressure control valve into its closed position.
REFERENCES:
patent: 2824632 (1958-02-01), Lucia et al.
patent: 3001415 (1961-09-01), Smirl
patent: 3085449 (1963-04-01), Corte et al.
patent: 4126059 (1978-11-01), Smemo
Krizmanich George H.
Ross Karl F.
Zahnradfabrik Friedrichshafen Aktiengesellschaft
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