Patent ID: 7686309

Claim:
A hydraulic system for a suspension system for a vehicle, the vehicle including a vehicle body and at least one forward pair of wheel assemblies and at least one rearward pair of wheel assemblies, the hydraulic system including: at least one first pair of wheel rams at a first end of the vehicle, each ram thereof including a compression chamber and a rebound chamber, and at least one second pair of wheel rams at a second end of the vehicle, each ram thereof including a compression chamber and a rebound chamber; and wherein the system includes first and second diagonal circuits with respect to said vehicle, the first diagonal circuit interconnecting a first left wheel ram and a second right wheel ram, the compression chamber of each wheel ram being in fluid communication with the rebound chamber of the other wheel ram forming first and second fluid volumes of the first diagonal circuit: the second diagonal circuit interconnecting a first right wheel ram and a second left wheel ram, the compression chamber of each wheel ram being in fluid communication with the rebound chamber of the other wheel ram forming first and second fluid volumes of the second diagonal circuit; and wherein the hydraulic system includes at least one first modal resilience device and at least one second modal resilience device, the at least one second modal resilience device being separate from the at least one first modal resilience device; the first and second modal resilience devices each including at least one resilient means, at least one moveable member and at least first and second system modal chambers, wherein the first modal resilience device has the first system modal chamber thereof connected in fluid communication with the first fluid volume of the first diagonal circuit forming a first diagonal first compression volume, the second system modal chamber thereof connected in fluid communication with the second fluid volume of the second diagonal circuit forming a second diagonal second compression volume, and the second modal resilience device has the first system modal chamber thereof connected in fluid communication with the first fluid volume of the second diagonal circuit forming a second diagonal first compression volume, and the second system modal chamber thereof connected in fluid communication with the second fluid volume of the first diagonal circuit forming a first diagonal second compression volume; and wherein motion of the moveable member of each modal resilience device due to roll or pitch motion of the vehicle is controlled by the respective at least one resilient means to thereby provide respective roll or pitch resilience in the system.