Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Reexamination Certificate
2007-07-17
2007-07-17
Estremsky, Sherry (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
C475S122000
Reexamination Certificate
active
11192028
ABSTRACT:
A hydraulic control apparatus for an automatic transmission including two frictional coupling devices of a first group and a plurality of frictional coupling devices of a second group, the control device including a second-group-engaging switching valve arranged to receive second engaging hydraulic pressures generated to engage the coupling devices of the second group and operable, upon reception of at least one of the second engaging hydraulic pressures, to generate a second-group-engaging pilot hydraulic pressure, and a fail-safe valve to receive at least one of first engaging hydraulic pressures generated to engage the two coupling devices of the first group and operable, upon simultaneous reception of the first engaging hydraulic pressure generated to engage one of the two coupling devices of the first group and the second-group-engaging pilot hydraulic pressure, to prevent application of the first engaging hydraulic pressure to the other of the two coupling devices of the first group.
REFERENCES:
patent: 6102826 (2000-08-01), Takahashi et al.
patent: 6464610 (2002-10-01), Hisano et al.
patent: 6929584 (2005-08-01), Miyata et al.
patent: 2005/0003921 (2005-01-01), Morise et al.
patent: 2000-249219 (2000-09-01), None
Fujimine Takuya
Kondo Masami
Noda Kazuyuki
Nozaki Kazutoshi
Todo Minoru
Aisin AW Co. Ltd.
Estremsky Sherry
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Toyota Jidosha & Kabushiki Kaisha
Young Edwin A.
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