Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Reexamination Certificate
2006-09-12
2006-09-12
Estremsky, Sherry (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
C475S127000, C477S906000
Reexamination Certificate
active
07104910
ABSTRACT:
A hydraulic control apparatus for switching an operation of a hydraulically operated mechanical apparatus, by selectively operating two frictional engagement elements of a first, a second, a third, and a fifth frictional engagement elements, the hydraulic control apparatus including a first control valve which, in association with an event that respective hydraulic pressures to operate the first and second frictional engagement elements are both produced, drains one of the third and fifth frictional engagement elements and outputs a control hydraulic pressure; and a second control valve which, when at least two hydraulic pressures of (a) the control hydraulic pressure and (b) respective hydraulic pressures to operate the third and fifth frictional engagement elements are supplied to the second control valve, drains the other of the third and fifth frictional engagement elements.
REFERENCES:
patent: 4995285 (1991-02-01), Hayakawa et al.
patent: 6634991 (2003-10-01), Itou et al.
patent: 2000-249219 (2000-09-01), None
patent: 2001-248723 (2001-09-01), None
Kimura Hiromichi
Miyata Hideki
Morise Masaru
Sugawara Akio
Yasuda Yuji
Estremsky Sherry
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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