Patent ID: 8146721

Claim:
A self leveling shock absorber comprising: a base shell; an inner tube installed in the base shell, a low pressure chamber defined between the base shell and the inner tube; a piston rod installed in the inner tube and having a hollow portion and an upper portion that is closed; a piston valve coupled to an end of the piston rod to divide an internal space of the inner tube into a rebound chamber and a compression chamber; an outer tube installed to a lower portion of an outside of the inner tube, a high pressure chamber and a gas chamber defined between the base shell and the outer tube; a diaphragm separating the high pressure chamber from the gas chamber; a body valve installed to a lower end of the inner tube to control flow of fluid between the low pressure chamber and the high pressure chamber; a pump rod having a hollow portion therein and having a first end installed to the body valve and a second end, opposed to the first end, inserted into the hollow portion of the piston rod; and a relief valve installed to the body valve under the pump rod to return surplus fluid in the high pressure chamber to the low pressure chamber, the relief valve including a seat fixedly coupled to the body valve and having a through hole, a ball seated on the seat to close the through hole, and a ball support and an elastic member to compress the ball toward the seat, wherein the elastic member is in contact with a lower end surface of the pump rod to compress the pump rod.