Control system for a hydro-mechanical transmission

Details Control system for a hydro-mechanical transmission Control system for a hydro-mechanical transmission

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.

REFERENCES:
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patent: 3650107 (1972-03-01), Court
patent: 4102425 (1978-07-01), Marsden et al.
patent: 4192199 (1980-03-01), Hamma et al.
patent: 4368653 (1983-01-01), Mizuno et al.
patent: 4939900 (1990-07-01), Furumoto et al.
patent: 6575872 (2003-06-01), Gluck et al.
patent: 6761658 (2004-07-01), Stettler, Jr.
patent: 2004-11769 (2004-01-01), None

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