Brakes – Internal-resistance motion retarder – Magnetic fluid or material
Patent
1995-10-17
1996-12-31
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Magnetic fluid or material
188299, 18832219, F16F 1503
Patent
active
055885098
ABSTRACT:
A vibration damping device for mounting between two spaced portions of a vehicle. An inner metal cylindrical housing forms an internal piston chamber and is connected at one end to the vehicle, with a piston which is slidably mounted within the piston chamber, being connected to another portion of the vehicle. An outer housing surrounds a portion of the inner housing and forms a fluid duct or flow channel between fluid chambers formed on opposite sides of the piston. An electrode is mounted in the fluid duct for applying a voltage across the duct to affect the viscosity of an electrorheological (ER) fluid flowing therethrough to increase the damping force of the device. The electrode includes a plurality of circumferentially spaced splines and intervening grooves extending longitudinally along the fluid duct. The bottom portions of the grooves have a decreased electric field applied thereto than do the splines, providing bleed grooves or leak paths for the ER fluid to decrease the shear-rate of the fluid. The inner housing has elongated projections which extend into the grooves of the electrode to provide a more uniform electric field along the fluid duct to control the amount of leakage through the bleed grooves. A secondary electrode ground may be formed in the grooves to control the electric field in the bleed grooves.
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McKinley Gareth H.
Niaura William S.
Santa Maria Carmen S.
Watanabe Isao
Weitzenhof David A.
Bridgestone/Firestone Inc.
Oberleitner Robert J.
Santa Maria Carmen S.
Schwartz Chris
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