Land vehicles – Suspension modification enacted during travel – Suspension stiffness for ride comfort
Patent
1996-07-23
1998-10-06
Culbreth, Eric D.
Land vehicles
Suspension modification enacted during travel
Suspension stiffness for ride comfort
188267, 26714014, 280 5515, 280124105, B60G 1126
Patent
active
058165878
ABSTRACT:
A variable stiffness suspension bushing (18) that is useful in a suspension of a motor vehicle to reduce brake shudder includes a shaft or rod (40) connected to a suspension member (12), an inner cylinder (42) fixedly connected to the shaft or rod (40), and an outer cylinder (44) fixedly connected to a chassis member (16). A magnetorheological (MR) elastomer (48), having iron particles embedded therein, is interposed between the inner (42) and outer (44) cylinders, and a coil (54) is disposed about the inner cylinder (42). When the coil (54) is energized by electrical current provided from a suspension control module (20), a variable magnetic field is generated so as to influence the magnetorheological (MR) elastomer (48) whereby variable stiffness values of the elastomer (48) are obtained to provide the bushing (18) with variable stiffness characteristics in order to eliminate compromises heretofore necessary when using single, fixed rate bushings.
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A Model of the Behaviour of Magnetorheological Materials, Mark R. Jolly, J. David Carlson and Beth C. Munoz, pp. 607-614.
The Brake Judder Phenomenon, by Alexander de Vries and Mark Wagner, SAE Paper 920554, pp. 25-33.
Elie Larry Dean
Ginder John Matthew
Nichols Mark Edward
Stewart William McMurray
Brown Gregory P.
Culbreth Eric D.
Ford Global Technologies Inc.
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