Patent ID: 7635051

Claim:
A suspension system for a motor vehicle with level regulation for adjusting a height of a vehicle body, comprising: a piston-cylinder unit provided with a work cylinder, a piston rod axially movable in the work cylinder, and a damping piston connected to the piston rod; an arrangement of damping valves provided in the damping piston and operable during rebound and compression strokes of the damping piston; a high pressure chamber and a low pressure chamber which are partially filled with damping medium; a pump unit for pumping damping medium from the low pressure chamber to the high pressure chamber, the pump unit comprising a pump piston and a drive unit for reciprocally displacing the pump piston, the piston-cylinder unit being assembled separately from the pump unit and configured to receive damping medium prior to mounting the pump unit to the piston-cylinder unit; and a base on the piston-cylinder unit configured to support the pump unit and having at least one connection for conducting a flow of damping medium to or from the pump unit when the pump unit is mounted on the piston-cylinder unit, the at least one connection being open to the atmosphere when the pump unit is not mounted on the piston-cylinder unit, the base comprising blocking elements which prevent flow communication between the chambers and the at least one connection prior to mounting the pump unit on the piston-cylinder unit.