Abstract: Presented is a piston-cylinder unit. The piston-cylinder unit includes an outer tube defining a cavity, a working cylinder disposed in the cavity of the outer tube and filling only a portion of the cavity. The unfilled portion of the cavity is a compensating space. The compensating space is divided into an area filled with a damping medium and an area filed with a gas. The piston-cylinder unit further includes a piston rod that includes a damping piston. The piston rod is disposed in the working cylinder and has freedom of axial movement, and is configured to displace the gas. The piston-cylinder unit further includes a reservoir that has a variable volume configured for actuating the compensating space.

Abstract: A wheel-guiding spring strut, optionally with internal level regulation, including a shock strut, optionally constructed as a self-pumping hydropneumatic spring strut, a piston rod supported at an upper supporting bearing, and a coil spring which is fixed between the spring strut and the supporting bearing at a spring plate. The spring plate that cooperates with the end of the piston rod is arranged so as to be cardanically movable relative to the piston rod.

Abstract: A self-pumping hydropneumatic spring strut with internal leveling is provided for use in motor vehicles having an oil filled working cylinder, which is under the pressure of at least one gas cushion arranged in a high pressure chamber and acting as a spring. The high pressure chamber is connected to a working space, wherein a bleed opening forms a flow connection between the working space and the low pressure chamber. The bleed opening can be closed as a function of the position of the working piston in the working cylinder. The spring strut is assigned an actuator which displaces the spring strut in the vertical direction. The actuator can displace the motor vehicle to a plurality of displacement distances without requiring any electrical or electronic control, complex external leveling devices, or displacement detection systems.

Abstract: A suspension system for motor vehicles with level regulation for adjusting a predetermined height of the vehicle body includes at least one piston-cylinder unit with a work cylinder, a piston rod and a damping piston having damping valves. A pump is connected between an oil reservoir and the piston cylinder unit via corresponding inlet and outlet lines. The pump is driven by a drive unit and the level height is detected by a sensor which acts on the drive unit or on a regulating valve via evaluating electronics.

Abstract: A suspension system for motor vehicles with level regulation for adjusting a predetermined height of the vehicle body includes at least one piston-cylinder unit with a work cylinder, a piston rod and a damping piston having damping valves. A pump is connected between an oil reservoir and the piston cylinder unit via corresponding inlet and outlet lines. The pump is driven by a drive unit and the level height is detected by a sensor which acts on the drive unit or on a regulating valve via evaluating electronics.

Abstract: A self-pumping hydropneumatic spring strut with internal leveling is provided for use in motor vehicles having an oil filled working cylinder, which is under the pressure of at least one gas cushion arranged in a high pressure chamber and acting as a spring. The high pressure chamber is connected to a working space, wherein a bleed opening forms a flow connection between the working space and the low pressure chamber. The bleed opening can be closed as a function of the position of the working piston in the working cylinder. The spring strut is assigned an actuator which displaces the spring strut in the vertical direction. The actuator can displace the motor vehicle to a plurality of displacement distances without requiring any electrical or electronic control, complex external leveling devices, or displacement detection systems.