Brakes – Internal-resistance motion retarder – Magnetic fluid or material
Patent
1994-05-10
1996-11-12
Ballato, Josie
Brakes
Internal-resistance motion retarder
Magnetic fluid or material
188276, 188296, F16F 1503
Patent
active
055730884
ABSTRACT:
A variable resistance device capable of utilizing a variable viscosity material, such as an electro-rheological fluid or a magneto-rheological fluid. In one embodiment, a moving member is provided having at least one projecting member for defining a flow path of the variable viscosity material, and for maintaining a precise gap distance between the moving member and other components of the variable resistance device. The moving member engages a shaft so that the moving member is rotatable by the shaft about the longitudinal axis of the shaft, and is also slidable on the shaft along the longitudinal axis. A controllable force dampener device is also provided. In one embodiment, a first expandable bellows and a second expandable is seperated by an ER fluid (or MR fluid) valve for controllably restricting the flow of the variable viscosity material between the first bellows and the second bellows to effect active force dampening. The variable resistance device and the force dampener are incorporated into a drive train/braking system and suspension system of a vehicle. Other uses of the inventive variable resistance device include a high efficiency wind-to-energy generator, a reel for the controlled unwinding of a line, a variable resistance exercise device, a safety brake for a circular saw, and other applications where controlled resistance is desired. Other uses of the force dampener include earthquake-proof buildings, dampening vibration of a helicopter rotor or airplane propeller, a high-precision weapons mount, engine mounts, and other applications where active controllable dampening of force is desired.
REFERENCES:
patent: 4896754 (1990-01-01), Carlson et al.
patent: 5090531 (1992-02-01), Carlson
patent: 5248113 (1993-09-01), Daniels
Ballato Josie
Daniels John J.
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