Fluid-driven drive

A fluid-driven drive, comprising:

• a movable working surface;
• a volume-variable cavity;
• and
• an unstable element,
• wherein given a movement of the working surface in a first movement direction, the unstable element is initially moved at least in a section with an increased expenditure of force out to a first unstable point, wherein when going past the first unstable point in the first movement direction, in addition to a force that is provided by fluid pressure, a force exerted by the unstable element also occurs 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 is initially moved with an increased expenditure of force out to a second unstable point, wherein when passing the second unstable point in the second movement direction, a lower expenditure of force is required for movement of the working surface for at least a section of the movement in the second movement direction, and
• wherein during the movement of the working surface in the first movement direction, energy is stored in the unstable element and a maximum output force of an actuator creating the fluid pressure is reduced, wherein the stored energy is released during the movement of the working surface in the second movement direction.