Abstract: A shock absorber for a wheel suspension of a vehicle may include an outer cylinder, an outer piston that is axially displaceably guided in the outer cylinder, an inner piston that is axially displaceably guided in the outer piston, and a piston rod that is connected to the inner piston and that is guided out of the outer piston. A surface, which is located remote from the piston rod, of a piston portion of the outer piston, which is axially displaceably guided on an inner lateral surface of the outer cylinder, is connected so as to communicate partially with surroundings of the shock absorber.

Abstract: The invention relates to a fluid-driven drive having a movable working surface and a volume-variable cavity, further having an unstable element, wherein given a movement of the working surface in a first movement direction, the unstable element can initially be moved at least in a section with an increased expenditure of force out to an unstable point, wherein when going past the unstable point in the first movement direction, in addition to the force that is provided by fluid pressure, a force exerted by the unstable element is also available in the direction of the first movement direction, wherein given a subsequent movement of the working surface in a second movement direction opposite to the first movement direction, the unstable element can be initially moved with an increased expenditure of force out to an unstable point, wherein when passing the unstable point in the second movement direction, a lower expenditure of force is required for movement at least sectionally.

Abstract: The invention relates to a fluid-driven drive having a movable working surface and a volume-variable cavity, further having an unstable element, wherein given a movement of the working surface in a first movement direction, the unstable element can initially be moved at least in a section with an increased expenditure of force out to an unstable point, wherein when going past the unstable point in the first movement direction, in addition to the force that is provided by fluid pressure, a force exerted by the unstable element is also available in the direction of the first movement direction, wherein given a subsequent movement of the working surface in a second movement direction opposite to the first movement direction, the unstable element can be initially moved with an increased expenditure of force out to an unstable point, wherein when passing the unstable point in the second movement direction, a lower expenditure of force is required for movement at least sectionally.

Abstract: A shock absorber for a wheel suspension of a vehicle may include an outer cylinder, an outer piston that is axially displaceably guided in the outer cylinder, an inner piston that is axially displaceably guided in the outer piston, and a piston rod that is connected to the inner piston and that is guided out of the outer piston. A surface, which is located remote from the piston rod, of a piston portion of the outer piston, which is axially displaceably guided on an inner lateral surface of the outer cylinder, is connected so as to communicate partially with surroundings of the shock absorber.