Rotational speed differential responsive type control coupling

Details Rotational speed differential responsive type control coupling Rotational speed differential responsive type control coupling

1992-04-01

1993-08-03

Herrmann, Allan D.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Control of differential planetary gearing

475231, 60403, 60468, 60494, 91 65, 91474, 91449, 92158, 92159, F16D 3102

Patent

active

052324109

ABSTRACT:
A pair of orifices of different orifice sizes is provided between each pressure chamber and an accumulator chamber. A larger one serves as a variable orifice and a smaller one as a fixed orifice. The variable orifice becomes effective when a control circuit is functioning properly for variably controlling an axial position of a valve spool. The fixed orifice becomes effective when the control circuit malfunctions and allows the valve spool to be moved into a predetermined position. In another embodiment, a single orifice cooperates with the valve spool to serve as both a variable orifice and a fixed orifice.

REFERENCES:
patent: 4212230 (1980-07-01), Eickmann
patent: 4244279 (1981-01-01), Stewart et al.
patent: 4932510 (1990-06-01), Takemura et al.

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