Patent ID: 7360771

Claim:
A roll control actuator for a stabilizer bar in a vehicle suspension comprising: an outer housing adapted for attachment to a first stabilizer bar portion, said outer housing defining an internal cavity; an internal mechanism adapted for attachment to a second stabilizer bar portion, said internal mechanism extending into said internal cavity and defining a central axis; a plurality of fluid chambers formed between said outer housing and said internal mechanism, said plurality of fluid chambers comprising at least a first fluid chamber defining a first fluid volume and a second fluid chamber defining a second fluid volume that is different from said first fluid volume; and a control that selectively adjusts roll stiffness by controlling fluid flow through said plurality of fluid chambers, wherein said control allows free fluid flow through said plurality of fluid chambers for a first driving condition and prevents fluid flow through said plurality of fluid chambers for a second driving condition different from the first driving condition, wherein fluid flow is restricted during the second driving condition as a result of said first and said second fluid volumes being different from each other.