Patent attributes
An air spring structure has a first communication hole formed in a peripheral surface of a cylinder and a second communication hole formed in the peripheral surface at a position closer to an axle than the first communication hole. A piston has a sliding portion that comes into contact with an inner peripheral surface of the cylinder and partitions the cylinder into an inner chamber and a balance chamber. The sliding portion has an axial length shorter than an axial length between the first communication hole and the second communication hole. A communication member has a communication path formed so as to pass through the first communication hole and the second communication hole to allow the inner chamber and the balance chamber to communicate with each other.
