Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1997-10-15
1999-07-06
Marmor, Charles A.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
475116, 475128, 477906, F16H 6112
Patent
active
059191082
ABSTRACT:
In an automatic transmission of an automotive vehicle equipped with a change-speed gear train capable of selectively establishing first-speed to fourth-speed drive power trains, there are provided first and second solenoid valves each in the form of a normally open valve arranged to be supplied with fluid under pressure at its output fluid passage in a deactivated condition, third and fourth solenoid valves each in the form of a normally closed valve arranged to permit fluid under pressure discharged from its output fluid passage in a deactivated condition, a first spool valve for fail-safe arranged to disengage a first hydraulic brake of the change-speed gear train when all the solenoid valves are supplied with the fluid under pressure at their output fluid passages or when the fourth solenoid valve and either one of the first, second and third solenoid valves are supplied with the fluid under pressure at their output fluid passages, and a second spool valve for fail-safe arranged to disengage a second hydraulic brake of the change-speed gear train when the first and fourth solenoid valves are supplied with the fluid under pressure at their output fluid passages.
REFERENCES:
patent: 4896568 (1990-01-01), Gierer
patent: 4995285 (1991-02-01), Hayakawa et al.
patent: 5538479 (1996-07-01), Niiyama
patent: 5601506 (1997-02-01), Long et al.
Aisin Seiki Kabushiki Kaisha
Estremsky Sherry Lynn
Marmor Charles A.
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