Pressure compensation in hydraulic vehicle suspension systems

A hydraulic system for a vehicle suspension, said hydraulic system being a portion of a roll control component of said vehicle suspension, said hydraulic system including

• a front hydraulic ram means and a rear hydraulic ram means, the front and rear hydraulic ram means being respectively in the form of a double acting hydraulic ram and including a cylinder portion and piston portion, the piston portion separating the cylinder portion into first and second chambers;
• a first fluid line extending, in use, between the first chamber of the front hydraulic ram means and the first chamber of the rear hydraulic ram means, thereby forming a first fluid volume,
• a second fluid line extending, in use, between the second chamber of the front hydraulic ram means and the second chamber of the rear hydraulic ram means, thereby forming a second fluid volume,
• at least one accumulator means in fluid communication with at least one said fluid volume, the accumulator means including a sealed gas enclosure and a fluid enclosure in fluid communication with said at least one fluid volume;
• and
• fluid flow restricting means adapted to restrict the rate of fluid flow between the fluid enclosure and the corresponding at least one fluid volume such that there is little to negligible change in the volume of the gas enclosure during cornering of the vehicle, the volume of the gas enclosure varying over time for at least substantially equalising the pressure in the fluid volume and the gas enclosure thereby minimizing variations in the pressure within the fluid volume.