Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid pump and motor in one of plural paths to or from...
Reexamination Certificate
2006-10-17
2006-10-17
Marmor, Charles A. (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid pump and motor in one of plural paths to or from...
C475S083000, C060S489000
Reexamination Certificate
active
07121970
ABSTRACT:
A variable relief valve is inserted in a hydraulic piping for connecting a first pump/motor to a second pump/motor. The variable relief valve is controlled such that when shifting the transmission from forward to reverse or vice versa, a relief set pressure of the variable relief valve is reduced in response to switching of a forward/reverse shifting clutch mechanism and after completion of the switching of the forward/reverse shifting clutch mechanism, the relief set value is increased.
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Funato Masahiro
Nakagawa Tomohiro
Okada Toshikazu
Yamamoto Shigeru
Frishauf Holtz Goodman & Chick P.C.
Holmes Justin K.
Komatsu Ltd.
Marmor Charles A.
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