Patent ID: 6202993
Filing Date: 2001-03-20
Classification: B60G

Abstract:
A self-pumping hydropneumatic shock strut with internal oil level regulation, comprising:a high-pressure chamber and a low-pressure chamber arranged in said shock strut;a work cylinder filled with oil;a work piston connected at an end of a hollow piston rod and slidably inserted in said work cylinder for dividing said work cylinder into a first work space and a second work space, said first work space operatively connected with said high-pressure chamber;a piston pump operatively connected in said piston rod for delivering oil from said low-pressure chamber into said first work space, said piston pump comprising a pump cylinder formed by said hollow piston rod and a hollow pump rod having a first end fixed relative to said work cylinder and a second end comprising a suction valve inserted into said hollow piston rod, said pump rod having a bore there through connected with said low-pressure chamber so that said suction valve draws oil from said low-pressure chamber when said piston rod moves out of said work cylinder;a regulating opening arranged through said pump rod so as to be closable by said piston rod as a function of a position of said piston rod in said work cylinder; andan overload valve operatively arranged in said piston pump for allowing oil to flow from said pump cylinder back toward said low-pressure chamber during an overpressure condition in said piston pump.