Suspension system

A suspension system comprising:

• damping force control cylinders each including an upper cylinder chamber whose volume increases during expansion and decreases during contraction, a lower cylinder chamber whose volume decreases during expansion and increases during contraction, and a variable valve that adjusts the flow rate of oil flowing out of the lower cylinder chamber based on the result of detection performed by a detector that detects a physical quantity of a vehicle, wherein the damping force control cylinders are incorporated in a pair of wheels of a plurality of wheels included in the vehicle;
• a first communication path through which the upper cylinder chamber of one of the damping force control cylinders is in communication with the lower cylinder chamber of the other of the damping force control cylinders;
• a second communication path through which the lower cylinder chamber of the one damping force control cylinder is in communication with the upper cylinder chamber of the other damping force control cylinder;
• a pair of accumulators that are provided in the first and second communication paths, respectively, and hold and discharge oil of the first and second communication paths, depending on operations of the damping force control cylinders;
• a variable valve that limits the flow rate of oil flowing into at least one of the accumulators;
• and
• a check valve provided in parallel with the variable valve.