Spring strut for vehicles

A spring strut for a vehicle, comprising:

• a container having a bottom end and an open upper end;
• a piston rod guide connected at the open upper end of said container and having a bore hole;
• a piston rod having an upper end and a lower end and guidably inserted through said bore hole of said piston rod guide;
• a piston mounted on said lower end of said piston rod so that said piston is movable in said container;
• said piston rod guide having a piston rod seal for outwardly sealing said piston rod;
• said piston rod guide comprising a damping valve connecting a space above said piston and a compensation space in said container;
• a spring carrier mounted on said container and having a contact surface acting on said damping valve of said piston rod guide with a damping force;
• a support spring arranged between a structural component of the vehicle and said spring carrier;
• and
• an auxiliary device exerting a force on one of said spring carrier and said support spring, said auxiliary device being arranged such that the damping force exerted on said damping valve produces a predetermined damping effect throughout an operating range of compression of said support spring, wherein said auxiliary device is fixedly connected to one of said container and a vehicle part mounted in a fixed position relative to said container.