Axle assembly for a heavy-goods vehicle, heavy-goods vehicle with at least one such axle assembly and a hydraulic unit, in particular for adjusting an adjustable unit designed as a cylinder-piston arrangement

Heavy goods vehicle comprising at least one axle assembly, the at least one axle assembly comprising:

• a pivot bearing having a substantially vertically extending steering rotational axis (X),
• a wheel support that is arranged so as to be rotatable about the steering rotational axis (X) and comprises at least one wheel that is mounted thereon so as to be rotatable about the wheel rotational axis (Z), the wheel rotational axis (Z) extending substantially horizontally and, in the case of straight travel, transversely to the travel direction (V), and the wheel rotational axis (Z) being arranged behind the steering rotational axis (X), in the travel direction (V), in every deflection state of the axle assembly, during straight travel, and
• a unit that is adjustable about the steering rotational axis (X) when the wheel support is rotated,
• the adjustable unit being adjustable between two operating states, specifically a forwards travel operating state in which it influences the rotational movement of the wheel support about the steering rotational axis (X), and a reverse travel operating state in which it introduces a steering force, which steers the axle assembly, into the axle assembly.

Hydraulic arrangement, in particular for adjusting an adjustable unit that is designed as a cylinder-piston arrangement, said hydraulic arrangement comprising:

• a hydraulically actuatable cylinder-piston arrangement comprising at least one first work chamber and at least one second work chamber,
• a reservoir for hydraulic fluid that is kept substantially at ambient pressure and that is fluidically connected, via a balancing line, to the at least one first work chamber of the cylinder-piston arrangement,
• a pressure reservoir that is fluidically connected, via a connecting line, to the at least one second work chamber of the cylinder-piston arrangement,
• a fluid supply line for supplying hydraulic fluid to the connecting line,
• a supply check valve that is associated with the fluid supply line and is adjustable between a blocking position and an open position, the supply check valve allowing a supply of hydraulic fluid from an external source that is not part of the hydraulic arrangement to the connecting line when in the open position, while separating the external source from the connecting line when in the blocking position, and the supply check valve being a valve that is pre-loaded into the blocking position,
• a fluid release line for releasing hydraulic fluid from the connecting line to the external source, and
• a release check valve that is associated with the fluid release line and is adjustable between a blocking position and an open position, the release check valve allowing a release of hydraulic fluid from the connecting line when in the open position, while separating the external source from the connecting line when in the blocking position, and the release check valve being a valve that is pre-loaded into the blocking position.