Gas pressure spring with overpressure protection, method for manufacturing the gas pressure spring

A gas pressure spring comprising:

• a. a pressure tube;
• b. a guide tube arranged coaxially to the pressure tube in the pressure tube;
• c. wherein the pressure tube forms a projection over the guide tube along the longitudinal axis of the pressure tube;
• d. wherein the gas pressure spring comprises a separation piston displaceable in the pressure tube along the longitudinal axis;
• e. wherein the separating piston fluid-tightly separates a working chamber in the guide tube, an annular chamber radially to the longitudinal axis between the guide tube and the pressure tube and a support chamber in the projection in an operating state of the gas pressure spring;
• f. wherein the annular chamber is filled with a compensating medium pressing the separating piston in the operating state with a compensating pressure in a direction enlarging the working chamber;
• g. wherein the support chamber is filled in the operating state with a supporting fluid pressing the separating piston with a supporting pressure in a direction making the working chamber smaller;
• h. wherein the working chamber is filled with a working fluid having a working pressure in the operating state;
• i. wherein a wall of the pressure tube has a local taper adjacent to the support chamber;
• j. wherein the taper forms a predetermined breaking point of the wall configured to open to release a portion of the compensating fluid, the working fluid and the supporting fluid from the pressure tube in a controlled manner when the supporting pressure exceeds a limit pressure;
• k. wherein a wall thickness of the wall within the taper has a line-shaped minimum;
• l. wherein the wall thickness increases monotonically from the minimum to an edge of the taper in all circumferential directions about a longitudinal axis of the pressure pipe;
• and
• m. wherein, when the predetermined breaking point is open, the separating piston is displaceable into a securing position in which the working chamber and the annular chamber are connected to the predetermined breaking point in a fluid-conducting manner.