Gas spring having a separating piston, and method for producing the gas spring

Abstract

The invention relates to a gas spring (100) comprising a pressure chamber in a pressure tube (110), the pressure chamber being filled with a gas, a working piston (120) which can be moved along a stroke axis (HA) in the pressure chamber, a piston rod (140) which is fastened to the working piston (120) and which is guided out of the pressure tube (110) through a guide seal device (130) along the stroke axis (HA), and a separating piston (150) which is disposed on the side of the working piston (120) that is remote from the guide seal device (130) and which can be moved along the stroke axis (HA) relative to the pressure tube (110) and relative to the working piston (120). The separating piston (150) divides the pressure chamber gas-tightly into a working chamber (112) containing the working piston (120) and a support chamber (113). The gas spring (100) comprises a holding device (160). The holding device (160) holds the separating piston (150) stationary on the pressure tube (110) as long as a positive pressure difference between a support pressure of the gas in the support chamber (113) and a working pressure of the gas in the working chamber (112) is less than a predefined switching difference. The holding device (160) is designed such that a switching force caused by the positive pressure difference acting on the separating piston (150) releases the separating piston (150) from the pressure tube (110) as soon as the positive pressure difference reaches or exceeds the switching difference, so that the separating piston (150) can move toward the working piston (120).

Description

Description Title of the invention: Gas pressure spring with separating piston, method for producing the gas pressure spring Technical area

[0001] The invention relates to a gas spring comprising a gas-filled pressure chamber in a pressure tube, a working piston displaceable in the pressure chamber along a stroke axis, a piston rod attached to the working piston and guided out of the pressure tube along the stroke axis by a guide-sealing device, and a separating piston arranged on the side of the working piston facing away from the guide-sealing device and displaceable along the stroke axis relative to the pressure tube and relative to the working piston. The separating piston divides the pressure chamber in a gas-tight manner into a working chamber containing the working piston and a support chamber.

[0002] The invention also relates to methods for producing the gas spring. State of the art

[0003] Gas springs known from the prior art are used, for example, to support components such as hatches, especially vehicle hatches, and height-adjustable furniture parts against their weight. If the gas pressure in such a gas spring decreases, for example due to a leak, the spring force of the gas spring decreases and, below a certain gas pressure, is no longer sufficient to support the component. As a result, the component can fall, injuring people or damaging objects.

[0004] The document DE 31 37 193 C1 describes a gas pressure spring which, as an insertion protection device, has a movable element arranged in the cylinder interior and sealed against the cylinder inner wall of the gas pressure spring. It has a partition wall. If the pressure in the gas chamber of the gas spring, which is divided by the piston, drops, the partition wall moves toward the piston until the pressure on both sides of the partition wall is equalized. When the piston rod of the gas spring is pushed into the cylinder, the piston comes into contact with the partition wall, so that as the piston rod is pushed further in, the insertion force increases significantly, preventing an uncontrolled fall of a component supported by the gas spring.

[0005] A disadvantage of the solution approach in DE 31 37 193 C1 is that even during normal operation, pressure fluctuations in the gas chamber, for example, due to the insertion and extension of the piston rod, cause the partition to move. This can cause unwanted noise or wear of a partition seal between the partition and the cylinder, which limits the service life of the gas spring. Technical task

[0006] The object of the invention is to create a cost-effective and easy-to-manufacture and durable gas spring with an insertion protection device in the event of pressure loss, which does not impair the function of the gas spring. Technical solution

[0007] The present invention provides a gas spring according to claim 1, which solves the technical problem. The problem is also solved by the methods for producing the gas spring according to claims 14 and 15. Advantageous embodiments are the subject of the dependent claims.

[0008] A gas spring according to the invention comprises a pressure chamber filled with a gas in a pressure tube, which is, for example, shaped like a hollow cylinder. The gas is, for example, an inert gas, in particular nitrogen.

[0009] The gas spring comprises a working piston that can be moved along a stroke axis in the pressure chamber, and a piston rod attached to the working piston and guided out of the pressure tube along the stroke axis by a guide and seal device. The guide and seal device guides the piston rod along the stroke axis and seals the pressure chamber gas-tight.

[0010] The gas spring comprises a separating piston arranged on the side of the working piston facing away from the guide-sealing device and displaceable along the stroke axis relative to the pressure tube and relative to the working piston. The separating piston divides the pressure chamber in a gas-tight manner into a working chamber containing the working piston and a support chamber. The working chamber lies between the guide-sealing device and the separating piston, and the support chamber lies between the separating piston and a bottom of the pressure tube. The separating piston fulfills the same function as the partition wall of the gas spring according to DE 31 37 193 C2 and thus forms an insertion safety device in the event of pressure loss. The separating piston is, for example, essentially cylindrical in shape and / or arranged coaxially to the stroke axis.

[0011] The gas spring comprises a holding device, wherein the holding device holds the separating piston stationary on the pressure tube as long as a positive pressure difference between a support pressure of the gas in the support chamber and a working pressure of the gas in the working chamber is smaller than a predefined switching difference. A positive pressure difference exists precisely when the support pressure is greater than the working pressure. In contrast to the holding device of the gas spring according to the invention, the projections in the cylinder of the gas spring from DE 31 37 193 C2 hold the partition wall stationary only when the working pressure is greater than the support pressure, i.e., when there is a negative pressure difference. DE 31 37 193 C2 therefore does not disclose a holding device within the meaning of the invention.

[0012] The support pressure is, for example, 100 bar to 200 bar, in particular about 150 bar. During normal operation of the gas spring, the working pressure deviates only slightly due to the retraction or extension of the piston rod. for example, by 1 bar to 10 bar, from the support pressure. The switching differential is positive and amounts to, for example, 10 bar to 20 bar, in particular approximately 15 bar.

[0013] The holding device is designed so that a switching force caused by the positive pressure difference acting on the separating piston releases the separating piston from the pressure pipe as soon as the positive pressure difference reaches or exceeds the switching difference, so that the separating piston can move towards the working piston. Beneficial effects

[0014] The switching differential is preferably selected so that, during normal operation of the gas spring, no positive pressure difference occurs that reaches or exceeds the switching differential. The holding device therefore ensures that the separating piston does not move toward the working piston during normal operation of the gas spring. Thus, the service life and function of the gas spring are not impaired by the insertion protection.

[0015] If there is a pressure loss in the working chamber, the working pressure becomes significantly lower than the support pressure, so that the positive pressure difference becomes significantly greater than during normal operation. As soon as the positive pressure difference reaches or exceeds the switching differential, the separating piston can detach from the pressure tube, so that if there is a pressure loss in the working chamber, the separating piston moves towards the working piston, driven by the positive pressure difference. As soon as the separating piston comes into contact with the working piston, the positive pressure difference causes the separating piston to exert a force on the working piston, inhibiting further insertion of the piston rod into the pressure tube.

[0016] The surface of the separating piston, upon which the positive pressure difference acts, can be significantly larger than the surface of the piston rod, which defines the spring force of the gas spring during normal operation. Thus, even if the support pressure due to the displacement of the separating piston toward the working piston is lower than the normal working pressure of the gas spring, the separating piston can exert a force on the working piston. which corresponds to the normal spring force of the gas spring. Consequently, the gas spring can prevent the component supported by the gas spring from falling, even in the event of a loss of pressure in the working chamber, especially a complete loss of pressure.

[0017] Typically, a pressure loss in a gas spring is caused by a leak in the guide-sealing device. By locating the separating piston on the side of the working piston facing away from the guide-sealing device, it is ensured that the support chamber does not suffer any pressure loss, even when the separating piston moves toward the working piston. Description of the execution types

[0018] The holding device preferably comprises a locking receptacle fastened to the pressure pipe and a locking projection fastened to the separating piston, wherein the locking projection is locked into the locking receptacle as long as the positive pressure difference is smaller than the switching difference, and wherein the locking projection is designed to disengage from the locking receptacle, preferably reversibly, by the switching force as soon as the positive pressure difference reaches the switching difference.

[0019] A snap-in connection makes it easy to achieve a precisely defined switching differential. Furthermore, the snap-in connection can be designed to be reversible, allowing the locking projection to be re-engaged into the locking receptacle after a pressure loss, and the gas spring to be refilled and closed, allowing the gas spring to be reused after the pressure loss.

[0020] The locking receptacle is preferably attached to the pressure pipe in a form-fitting manner, preferably between two circumferential beads of the pressure pipe. A form-fitting attachment ensures a particularly secure hold of the locking receptacle on the pressure pipe. The two circumferential beads make the form-fitting attachment particularly easy to achieve.

[0021] The locking receptacle preferably comprises a retaining disc, preferably with at least one slot for receiving the locking element. This allows the locking receptacle to be manufactured particularly easily.

[0022] The locking projection preferably comprises a locking pin aligned along the stroke axis, preferably tapered in sections. Such a locking pin can be easily manufactured and simply inserted into the locking receptacle, where it securely engages.

[0023] The holding device preferably comprises a predetermined breaking point in a connection between the separating piston and the pressure pipe, which is designed to break under the switching force as soon as the positive pressure difference reaches the switching differential. The predetermined breaking point preferably comprises an adhesive connection, a welded connection, or a soldered connection connecting the separating piston to the pressure pipe. With the predetermined breaking point, a precisely defined switching differential can be achieved particularly easily.

[0024] The holding device preferably comprises a clamp connection and / or a magnetic connection that connects the separating piston to the pressure tube and is designed to release under the switching force as soon as the positive pressure difference reaches the switching differential. A clamp connection or magnetic connection can be particularly easily designed to be reversibly released, allowing the gas spring to continue to be used after a pressure loss.

[0025] The separating piston preferably comprises a sealing element, preferably a lip seal, which forms a gas-tight seal between the separating piston and the pressure pipe, wherein the sealing element forms a gas-permeable check valve from the working chamber to the support chamber. When the working chamber is filled with gas, the gas can simultaneously fill the support chamber through the check valve. Consequently, the gas spring can be filled particularly quickly and easily, and no separate filling valve is required to fill the support chamber. Since both during normal operation and in the event of a pressure loss in the working chamber, the support pressure in the support chamber is at least as high as the working pressure in the Working chamber, the check valve is closed in both cases and therefore does not affect the normal operation of the gas spring or the insertion protection by the separating piston.

[0026] The separating piston may comprise a check valve which is separate from the sealing element and which is gas-permeable from the working chamber to the support chamber and which may be designed, for example, as described in the document DE 31 37 193 C2.

[0027] The support chamber can be connected in a gas-conducting manner, for example through at least one opening, to an annular chamber between the pressure tube and an outer tube that encloses the pressure tube around the stroke axis. The opening is arranged, for example, in a jacket wall of the pressure tube near the bottom of the pressure tube or in the bottom. This allows a sufficiently large gas volume to be provided in the support chamber and the annular chamber together, even with a short length of the gas spring along the stroke axis, to exert such a large force on the separating piston and the working piston that reliable insertion protection is achieved.

[0028] The separating piston preferably comprises a conduit, preferably a piston groove, a channel, and / or a porous region that connects the support chamber to the working chamber in a gas-conducting manner. Additionally or alternatively, the pressure tube can have at least one wall groove on an inner side of the jacket wall of the pressure tube that connects the support chamber to the working chamber in a gas-conducting manner when the separating piston is displaced along the stroke axis toward the guide-sealing device from an initial position in which the separating piston is held by the holding device.

[0029] Due to the line and / or the wall groove, the gas spring is not blocked by the support pressure acting on the separating piston after a pressure loss in the working chamber, but the piston rod can be slowly pushed in together with the working piston and the separating piston, whereby gas escapes through the line from the support chamber into the working chamber. This allows, for example, a pressure drop from the gas spring assisted tailgate of a vehicle must be closed manually in order to drive the vehicle to a workshop for replacement or repair of the gas spring.

[0030] Preferably, a flow resistance of the line for the gas is selected so large or a cross-sectional area of ​​the line is selected so small that the amount of gas escaping from the support chamber through the line in the event of a pressure loss in the working chamber does not impair the function of the insertion protection.

[0031] The separating piston preferably comprises a closure element that seals the line gas-tight as long as the separating piston is held stationary on the pressure tube. The closure element is designed to release the line as soon as the separating piston is moved relative to the pressure tube. Particularly in the case of a gradual pressure loss in the working chamber, the outflow of gas through the line from the support chamber into the working chamber could prevent the positive pressure difference from reaching the switching differential, even though the working pressure in the working chamber is no longer sufficient for safe operation of the gas spring. This risk is eliminated by the closure element.

[0032] The closure element can, for example, comprise a valve, in particular a crash valve, which is closed as long as the separating piston is in its initial position and has a switching element that opens the valve as soon as the separating piston comes into contact with the working piston due to a displacement of the separating piston along the stroke axis toward the guide-sealing device. The switching element can, for example, comprise a mandrel, a needle, and / or a cannula, which pierces a membrane of the valve as soon as the separating piston comes into contact with the working piston.

[0033] The closure element can, for example, be attached to the pressure pipe in such a way that it rests against the separating piston, sealing the line, as long as the separating piston is in its initial position. In addition, the closure element can be detachably attached to the separating piston, for example, in a tear-off manner, to ensure reliable closure of the line. Furthermore, the closure element can comprise a sealing element for closing the line.

[0034] The wall groove runs, for example, along the stroke axis and / or between the starting position of the separating piston, in particular the sealing element of the separating piston, and the guide-sealing device of the gas spring. In gas spring configurations with the wall groove, the sealing element of the separating piston is preferably designed as a rectangular ring because a rectangular ring penetrates the wall groove less deeply than, for example, an O-ring or a lip seal. The rectangular ring thus reduces the risk of the sealing element closing the wall groove.

[0035] The gas spring preferably comprises a guide device for guiding the separating piston in the pressure chamber along the stroke axis. This guide device prevents the separating piston from jamming in the pressure tube when the separating piston is moved toward the working piston, which could impair the function of the insertion safety device.

[0036] The guide device can, for example, comprise a guide sleeve, in particular a hollow cylindrical one, which is fastened to the separating piston and bears against an inner side of the pressure pipe.

[0037] The holding device preferably comprises a cartridge arranged in the pressure chamber and fastened to the pressure tube, wherein the cartridge holds the separating piston and at least partially encloses the support chamber. The cartridge allows for particularly simple production of the gas spring because the separating piston can be pre-assembled on the cartridge separately from the gas spring and then only needs to be inserted into the pressure chamber with the cartridge and secured there. The cartridge is, for example, essentially hollow-cylindrical in shape, arranged coaxially to the stroke axis, and / or arranged adjacent to an inner side of the pressure tube.

[0038] The cartridge can, for example, be designed so that when the separating piston is correctly positioned in the pressure chamber, it rests against the bottom of the pressure tube. This makes it particularly easy to insert the separating piston into the Pressure chamber can be positioned and the cartridge can be easily attached to the pressure pipe in the correct position.

[0039] The cartridge is preferably attached to the pressure tube in a form-fitting manner. This allows the cartridge to be easily and securely held to the pressure tube. The form-fitting attachment can be achieved, for example, by at least one deformation of the pressure tube toward the cartridge, in particular by at least one bead on the pressure tube that runs around the stroke axis.

[0040] The cartridge is preferably held between two beads of the pressure pipe running around the stroke axis or between a bead of the pressure pipe running around the stroke axis and a bottom of the pressure pipe.

[0041] A method according to the invention for producing a gas spring according to the invention, wherein the separating piston of the gas spring comprises a check valve that is permeable to gas from the working chamber to the support chamber, comprises simultaneously filling the working chamber and the support chamber with gas through the check valve. This allows the gas spring to be manufactured particularly easily and quickly.

[0042] A method according to the invention for producing a gas pressure spring according to the invention, wherein the holding device of the gas pressure spring comprises a cartridge arranged in the pressure chamber and fastened to the pressure tube, wherein the cartridge holds the separating piston and at least partially encloses the support chamber, comprises the steps: a. pre-assembling the separating piston on the cartridge, b. inserting the cartridge into the pressure chamber after pre-assembly, and c. attaching the cartridge to the pressure tube after insertion.

[0043] In this way, the gas spring can be manufactured particularly quickly and easily. Short description of the drawings

[0044] Further advantages, objects and features of the invention will be explained with reference to the following description and the accompanying drawings, in which exemplary objects according to the invention are shown.

[0045] Figure 1 shows a schematic longitudinal section of a gas pressure spring according to the invention.

[0046] Figure 2 shows a schematic plan view of a locking receptacle of a holding device of a gas pressure spring according to the invention.

[0047] Figure 3 shows a schematic longitudinal section of another gas pressure spring according to the invention. Fig.1

[0048] Figure 1 shows a schematic longitudinal section along the stroke axis HA of a gas pressure spring 100 according to the invention.

[0049] The gas pressure spring 100 shown comprises a pressure chamber filled with a gas in a pressure tube 110, a working piston 120 which is displaceable in the pressure chamber along the stroke axis HA, a piston rod 140 which is fastened to the working piston 120 and guided out of the pressure tube 110 along the stroke axis HA by a guide-sealing device 130, and a separating piston 150 which is arranged on the side of the working piston 120 facing away from the guide-sealing device 130 and which is displaceable along the stroke axis HA. The separating piston 150 is thus arranged between the working piston 120 and a bottom 115 of the pressure tube 110.

[0050] The separating piston 150 shown divides the pressure chamber in a gas-tight manner into a working chamber 112 containing the working piston 120 and a support chamber 113. The separating piston 150 comprises a sealing element 151, preferably a lip seal, which seals the separating piston 150 to the pressure pipe 110 in a gas-tight manner, wherein the sealing element 151 preferably forms a check valve permeable to gas from the working chamber 112 to the support chamber 113.

[0051] The illustrated gas spring 100 comprises a holding device 160, wherein the holding device 160 holds the separating piston 150 stationary on the pressure tube 110 as long as a positive pressure difference between a support pressure of the gas in the support chamber 113 and a working pressure of the gas in the working chamber 112 is smaller than a predefined switching difference. The holding device 160 is designed so that a switching force caused by the positive pressure difference acting on the separating piston 150 releases the separating piston 150 from the pressure tube 110 as soon as the positive pressure difference reaches the switching difference.

[0052] The holding device 160 shown comprises a locking receptacle 161 fastened to the pressure pipe 110 and a locking projection 162 fastened to the separating piston 150, wherein the locking projection 162 is locked into the locking receptacle 161 as long as the positive pressure difference is smaller than the switching difference, and wherein the locking projection 162 is designed to disengage from the locking receptacle 161, preferably reversibly, by the switching force as soon as the positive pressure difference reaches the switching difference.

[0053] The locking receptacle 161 shown is fastened to the pressure pipe 110 in a form-fitting manner between two beads 114 of the pressure pipe 110 which run around the stroke axis HA, the locking receptacle 161 being designed as a holding disk.

[0054] The locking projection 162 shown is designed as a locking pin aligned along the stroke axis HA and tapering in sections. Fig.2

[0055] Figure 2 shows a schematic plan view along the stroke axis of a locking receptacle 161 of a holding device 160 of a gas pressure spring 100 according to the invention. The locking receptacle 161 shown is designed as a holding disc which, for example, has two crossed slots 163 for receiving the locking projection 162. Fig.3

[0056] Figure 3 shows a schematic longitudinal section along the stroke axis HA of another gas pressure spring 100 according to the invention.

[0057] The gas spring 100 shown in Figure 3 differs from the gas spring shown in Figure 1 in that the holding device 160 comprises a cartridge 164 arranged in the pressure chamber and fastened to the pressure tube 110, which holds the separating piston 150 and partially encloses the support chamber 113.

[0058] The cartridge 164 shown rests against the bottom 115 of the pressure pipe 110 and is positively secured to the pressure pipe 110 by a bead 114 of the pressure pipe 110 that runs around the stroke axis HA.

[0059] The holding device 160 shown comprises a locking receptacle 161 fastened in the cartridge 164 and a locking projection 162 fastened to the separating piston 150, wherein the locking projection 162 is locked into the locking receptacle 161 as long as the positive pressure difference is smaller than the switching difference, and wherein the locking projection 162 is designed to disengage from the locking receptacle 161, preferably reversibly, by the switching force as soon as the positive pressure difference reaches the switching difference. List of reference symbols

[0060] 100 Gas spring 140 Piston rod 110 Pressure pipe 150 Separating piston 112 Working chamber 151 Sealing element 113 Support chamber 160 Holding device 114 bead 161 locking receptacle 115 Floor 162 Locking projection 120 Working piston 163 Slot 130 Guide sealing device 164 Cartridge HA lifting axle

Claims

Claims 1 . Gas pressure spring (100) comprising a. a pressure chamber filled with a gas in a pressure tube (110); b. a working piston (120) displaceable in the pressure chamber along a stroke axis (HA), c. a piston rod (140) fastened to the working piston (120) and guided out of the pressure tube (110) along the stroke axis (HA) by a guide and sealing device (130), and d. a separating piston (150) arranged on the side of the working piston (120) facing away from the guide and sealing device (130) and displaceable along the stroke axis (HA) relative to the pressure tube (110) and relative to the working piston (120), e. wherein the separating piston (150) divides the pressure chamber in a gas-tight manner into a working chamber (112) containing the working piston (120) and a supporting chamber (113), characterized in that f. the gas pressure spring (100) comprises a holding device (160), g.wherein the holding device (160) holds the separating piston (150) stationary on the pressure pipe (110) as long as a positive pressure difference between a support pressure of the gas in the support chamber (113) and a working pressure of the gas in the working chamber (112) is smaller than a predefined switching difference, and h. wherein the holding device (160) is designed such that a switching force caused by the positive pressure difference acting on the separating piston (150) releases the separating piston (150) from the pressure pipe (110) as soon as the positive pressure difference reaches or exceeds the switching difference, so that the separating piston (150) is movable towards the working piston (120).

2. Gas pressure spring (100) according to claim 1, a. wherein the holding device (160) comprises a locking receptacle (161) attached to the pressure tube (110) and a locking projection (162) attached to the separating piston (150), b. wherein the locking projection (162) is locked into the locking receptacle (161) as long as the positive pressure difference is smaller than the switching difference, and c. wherein the locking projection (162) is designed to disengage from the locking receptacle (161) by the switching force, preferably reversibly, as soon as the positive pressure difference reaches the switching difference.

3. Gas pressure spring (100) according to claim 2, a. wherein the locking receptacle (161) is fastened to the pressure tube (110) in a form-fitting manner, preferably between two beads (114) of the pressure tube (110) which encircle the stroke axis (HA), and / or b. wherein the locking receptacle (161) comprises a retaining disc which has at least one slot (163) for receiving the locking projection (162).

4. Gas pressure spring (100) according to claim 2 or 3, wherein the locking projection (162) comprises a locking pin aligned along the stroke axis (HA), preferably tapered in sections.

5. Gas pressure spring (100) according to one of claims 1 to 4, a. wherein the holding device (160) comprises a predetermined breaking point in a connection between the separating piston (150) and the pressure tube (110), which is designed to break due to the switching force as soon as the positive pressure difference reaches the switching difference, b. wherein the predetermined breaking point preferably comprises an adhesive connection, a welded connection, or a soldered connection that connects the separating piston (150) to the pressure tube (110).

6. Gas pressure spring (100) according to one of claims 1 to 5, wherein the holding device (160) comprises a clamping connection and / or a magnetic connection which connects the separating piston (150) to the pressure tube (110) and is designed to release due to the switching force as soon as the positive pressure difference reaches the switching difference.

7. Gas pressure spring (100) according to one of claims 1 to 6, a. wherein the separating piston (150) comprises a sealing element (151), preferably a lip seal, which seals the separating piston (150) to the pressure tube (110) in a gas-tight manner, b. wherein the sealing element (151) forms a check valve permeable to gas from the working chamber (112) to the support chamber (113).

8. Gas pressure spring (100) according to one of claims 1 to 7, wherein the separating piston (150) comprises a line, preferably a piston groove, a channel and / or a porous region, which connects the support chamber (113) to the working chamber (112) in a gas-conducting manner.

9. Gas pressure spring (100) according to one of claims 8, a. wherein the separating piston (150) comprises a closure element that closes the line in a gas-tight manner as long as the separating piston (150) is held stationary on the pressure tube (110), b. wherein the closure element is designed to release the line as soon as the separating piston (150) is moved relative to the pressure tube (110).

10. Gas pressure spring (100) according to one of claims 1 to 9, wherein the pressure tube (110) has at least one wall groove on an inner side of a jacket wall of the pressure tube (110), which connects the support chamber (113) to the working chamber (112) in a gas-conducting manner when the separating piston (150) is displaced from an initial position, in which the separating piston (150) is held by the holding device (160), along the stroke axis (HA) towards the guide-sealing device (130).

11. Gas pressure spring (100) according to one of claims 1 to 10, wherein the gas pressure spring (100) comprises a guide device for guiding the separating piston (100) in the pressure chamber along the stroke axis (HA).

12. Gas pressure spring (100) according to one of claims 1 to 11, a. wherein the holding device (160) comprises a cartridge (164) arranged in the pressure chamber and fastened to the pressure tube (110), b. wherein the cartridge (164) holds the separating piston (150) and at least partially encloses the support chamber (113).

13. Gas pressure spring (100) according to claim 12, wherein the cartridge (164) is positively secured to the pressure tube (110) by at least one deformation of the pressure tube (110) towards the cartridge (164), preferably by at least one bead (114) running around the stroke axis (HA).

14. A method for producing a gas pressure spring (100) according to one of claims 1 to 13, wherein the separating piston (150) of the gas pressure spring (100) comprises a check valve permeable to gas from the working chamber (112) to the support chamber (113), the method comprising simultaneously filling the working chamber (112) and the support chamber (113) with the gas through the check valve.

15. A method for producing a gas pressure spring (100) according to one of claims 1 to 13, wherein the holding device (160) of the gas pressure spring (100) comprises a cartridge (164) arranged in the pressure chamber and fastened to the pressure tube (110), wherein the cartridge (164) holds the separating piston (150) and at least partially encloses the support chamber (113), the method comprising the steps of: a. pre-assembling the separating piston (150) on the cartridge (164), b. introducing the cartridge (164) into the pressure chamber after pre-assembly and c. fastening the cartridge (164) to the pressure tube (110) after introduction.

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