Viscous rotational speed control device

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9995352
SERIAL NO

14699445

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A rotational speed control device maintains a shaft rotation speed. The device includes a housing containing a viscous fluid and a shaft disposed in the housing and rotatable relative to the housing. A rotor is coupled with the shaft for rotation in the viscous fluid. The rotor is axially displaceable along the shaft between a low-shear position and a high-shear position. A spring mechanism is disposed in the housing and biases the rotor toward the low-shear position. The rotor may be designed to cooperate with the housing or other nonrotating features within the housing to vary a shear gap according to the axial position of the rotor. The rotor, housing and spring mechanism can be designed to cooperate to create large changes in braking torque in response to small changes in shaft rotational speed. This allows the rotation speed to be controlled within a relatively narrow range.

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Patent Owner(s)

Patent OwnerAddress
NELSON IRRIGATION CORPORATION848 AIRPORT ROAD WALLA WALLA WA 99362

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Greenwood, Riley D Walla Walla, US 14 16
Nelson, Craig B Walla Walla, US 47 386
Perkins, Lee A Lowden, US 20 425
Sesser, George L Walla Walla, US 39 701

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