Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Reexamination Certificate
2007-08-28
2007-08-28
Estremsky, Sherry (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
C475S127000
Reexamination Certificate
active
11138273
ABSTRACT:
A hydraulic control apparatus for use with a vehicle's automatic transmission, the apparatus including a fail-safe switch valve which has an escape-related output port connected to a drain port of a transmission-related solenoid valve corresponding to an escape-related frictional coupling device to establish an escape-related speed step, and additionally has an escape-related input port to which a hydraulic pressure is inputted, and a drain port from which a hydraulic fluid is drained, wherein the fail-safe switch valve is selectively switchable to a normal communication state thereof in which the escape-related output port and the drain port are communicated with each other and the escape-related input port is shut off, and to a fail-related communication state thereof in which the escape-related output port and the escape-related input port are communicated with each other, and the drain port is shut off, so that a hydraulic pressure is supplied from the escape-related output port of the fail-safe switch valve to the drain port of the transmission-related solenoid valve corresponding to the escape-related frictional coupling device.
REFERENCES:
patent: 2004/0063534 (2004-04-01), Fujimine et al.
patent: 2006/0172856 (2006-08-01), Takagi
patent: 2007/0066435 (2007-03-01), Takagi et al.
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patent: 2004-36672 (2004-02-01), None
Fujimine Takuya
Kondo Masami
Noda Kazuyuki
Nozaki Kazutoshi
Aisin AW Co. Ltd.
Estremsky Sherry
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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