Self-pumping hydropneumatic suspension strut with internal ride-height control

A self-pumping hydropneumatic suspension strut with internal ride height control, said strut comprising:

• an outer tube having a first filling bore hole and a second filling bore hole,
• an intermediate base received in said outer tube, said second filling bore hole being closed by said intermediate base when said intermediate base is fully received in said outer tube,
• a work cylinder located concentrically inside said outer tube,
• a first work space between said outer tube and said work cylinder, said first work space having therein a high pressure chamber comprising an enveloping body having a deformable wall containing a gas which forms at least one gas cushion acting as a spring,
• an axially displaceable piston sealed in said work cylinder and defining a second work space connected to said first work space through said work cylinder,
• a low pressure chamber containing oil, said low pressure chamber communicating with said second filling bore hole when said intermediate base is not fully received in said outer tube,
• a hollow piston rod which supports said axially displaceable piston,
• a pump rod received in a pump cylinder formed by said piston rod, said piston rod connecting said second work space to said low pressure chamber, and
• a piston rod guide fitted in said outer tube and receiving said piston rod therethrough, said piston rod guide having formed therein a flow connection connected to said at least one gas cushion in said high pressure chamber, said flow connection communicating with said first filling bore hole while said piston rod guide is not fully received in said outer tube, said first filling bore hole being closed by said piston rod guide when said piston rod guide is fully received in said outer tube.