Fuel system

Abstract

A tank system for a transport system, particularly for a motor vehicle, for holding a gaseous or liquid medium, preferably liquefied petroleum gas (LPG), comprises an inner tank for holding the medium and an outer tank, wherein the inner tank is supported in the outer tank by means of a floating bearing with a floating bearing element and a fixed bearing with a fixed bearing element, forming a gap. The floating bearing is designed such that it allows translational movement and / or expansion of the inner tank relative to the outer tank in an axial direction. The floating bearing element and / or the fixed bearing element consists at least partially, and in particular entirely, of plastic.

Description

[0001] The invention relates to a tank system for a transport system, in particular for a motor vehicle, for receiving a gaseous or liquid medium, preferably liquefied gas.

[0002] The tank system according to the invention is a tank system for receiving a gaseous or liquid medium with which the transport system itself can be operated. However, it can also be a tank system with which the transport system transports a medium or delivers it to a specific location. The term "tank system" therefore refers to a system that can be integrated into a transport system and that is designed to receive and / or supply any type of gaseous or liquid medium.

[0003] The gaseous or liquid medium can be any type of liquid or gas. For example, the medium can be a fuel used to operate a device. This includes conventional fuels such as diesel or gasoline, but also so-called e-fuels or liquefied gases such as liquefied hydrogen (LH2) or liquefied natural gas (LNG). The medium can also be a substance to be transported in the chemical industry. In particular, the tank system according to the invention is suitable for holding cryogenic media.

[0004] According to the invention, a transport system is understood to be a mobile system for transporting people and / or goods, such as a cargo bike, a motorcycle, an automobile, a truck, an airplane, a train, and / or a ship, which can be powered by liquid or solid fuel or electrically. The transport system can, for example, be a motor vehicle that transports and / or is powered by liquefied petroleum gas (LPG).

[0005] Storing liquefied petroleum gas (LPG) places diverse demands on the tank system, as the medium must often be stored at cryogenic temperatures. Conventional tank systems for such applications are therefore typically double- or multi-walled, meaning they comprise an inner tank for holding the medium and at least one outer tank, with the inner tank mounted within the outer tank, forming an insulating gap. In this context, "mounting" refers to a suspension, fixing, or assembly arrangement that reliably secures the inner tank within the outer tank and maintains a distance from it.

[0006] The design of the suspension or mounting system is crucial for the quality of the tank system, as the mounting must withstand constant stresses caused by internal and external influences. For example, it must be ensured that the mounting system can resist and / or absorb and compensate for external influences such as acceleration of the transport system, which can lead to relative deflection of the tanks, or road vibrations, which can cause vibrations in the mounting components.

[0007] Furthermore, there is usually a significant temperature difference between the inner and outer tanks. Since the bearing creates a connection between the inner and outer tanks, it forms a kind of thermal bridge. To minimize heat loss, it is advantageous if this bearing has the lowest possible thermal conductivity. For example, partial evaporation of the stored medium due to unwanted heating can lead to a loss of range for the transport system. Additionally, a vacuum, especially a high vacuum, usually exists in the gap between the inner and outer tanks, which is why the bearing must also be suitable for (high) vacuum applications; that is, it must not become brittle or outgas.

[0008] Furthermore, the installation space for the storage area between the tank walls is limited, as the tank system as a whole should be as compact as possible to facilitate its integration. In addition, the tank system should be as economical and easy to manufacture as possible. Therefore, the tank system faces complex economic, mechanical, and thermodynamic requirements.

[0009] It is therefore an object of the present invention to provide a more economical, compact and robust tank system for a transport system.

[0010] This problem is solved according to the invention by a tank system for a transport system with the features of claim 1, and in particular by the fact that the inner tank is mounted in the outer tank by means of a floating bearing with a floating bearing element and a fixed bearing with a fixed bearing element, forming a gap. The floating bearing is designed such that it allows translational movement and / or expansion of the inner tank relative to the outer tank in an axial direction. Furthermore, the floating bearing element and / or the fixed bearing element comprise a plastic. Preferably, the floating bearing element and / or the fixed bearing element consist of the plastic.

[0011] The combination of loose and fixed bearings according to the invention ensures that the inner tank is securely fixed within the outer tank, while simultaneously efficiently compensating for external and internal influences acting on or within the tank system. For example, the bearings can compensate for forces and moments resulting from the movement of the transport system, expansion and / or contraction of the inner tank due to temperature or pressure differences, and manufacturing tolerances. The tank system is therefore particularly durable and robust.

[0012] Furthermore, plastic is a cost-effective and easy-to-process material, so the bearing elements are cheap and easy to manufacture, which is why the tank system according to the invention is characterized by improved economic efficiency.

[0013] It should be noted that the floating bearing element and / or the fixed bearing element can be hybrid components, comprising materials other than plastic. For example, an axial end section of the elements that contacts one of the tanks can be made of metal to simplify mounting. It is also conceivable that both axial end sections are metallic with a plastic section extending between them.

[0014] The plastic can be molded onto metallic components of the elements or attached in other ways.

[0015] Further embodiments of the invention are specified in the claims, the description and the accompanying drawings.

[0016] The plastic can be polyetheretherketone (PEEK), a high-strength and easily processed material with excellent mechanical and thermodynamic properties. PEEK is particularly suitable for low-temperature and / or high-vacuum applications because it does not become brittle or outgas under these conditions.

[0017] Preferably, the plastic has a thermal conductivity of less than 1.0 W / m*K, particularly less than 0.5 W / m*K, and preferably less than 0.25 W / m*K. This minimizes heat transfer from the outer tank to the inner tank, resulting in the inner tank heating up only minimally or very slowly. This, in turn, prevents expansion of the inner tank due to heating and makes the tank system more energy-efficient overall.

[0018] For a particularly durable and resistant design of the bearings, the plastic can have a modulus of elasticity between 3000 and 5000 MPa, in particular between 3600 and 4800 MPa, preferably between 4100 and 4300 MPa.

[0019] Furthermore, the inner tank can have a cylindrical shape with its longitudinal axis parallel to the axial direction. Additionally or alternatively, the outer tank can also have a cylindrical shape with its longitudinal axis parallel to the axial direction. In particular, the inner and outer tanks can be arranged coaxially, which facilitates better integration of the tank system into or mounting on the transport system.

[0020] The loose bearing and the fixed bearing can be arranged on opposite sides of the inner tank, in particular in the middle of the longitudinal axis.

[0021] For particularly stable mounting of the inner tank in the outer tank, the loose bearing element and the fixed bearing element can be arranged coaxially, in particular coaxially with the axial longitudinal axis of the inner tank and / or the outer tank.

[0022] The fixed bearing element and the floating bearing element can each have a base body and at least one conical mounting section.

[0023] In particular, the loose bearing element can have exactly one conical mounting section, wherein the loose bearing element can have a sliding seat section adjoining the base body and opposite the mounting section.

[0024] The sliding seat section can have a non-rotationally symmetrical cross-section, so that all rotational degrees of freedom of movement of the inner tank relative to the outer tank can be efficiently locked.

[0025] The fixed bearing element, on the other hand, can have exactly two conical fastening sections opposite each other in relation to the base body.

[0026] Furthermore, the base body of the fixed bearing element and / or the base body of the floating bearing element can have a conical shape. The conical shape is a stress-optimized contour shape. It enables a homogeneous stress distribution and thus a uniform load on the bearing elements.

[0027] Additionally or alternatively, the base body of the fixed bearing element can have a smaller wall thickness, at least in sections, than at least one fastening section of the fixed bearing element.

[0028] Accordingly, the base body of the loose bearing element can also have a smaller wall thickness, at least in sections, than the fastening section of the loose bearing element and / or the sliding seat section.

[0029] With a suitable choice of the basic body geometry, the stability of the corresponding bearing element is determined by its shape, allowing for thinner wall thicknesses compared to conventional designs without compromising bearing reliability. A thinner wall thickness also reduces the component's thermal conductivity, thus improving insulation between the tanks.

[0030] Furthermore, the loose bearing and the fixed bearing can each have at least one flange element, and the fastening section can be fixed axially and rotationally fixed to the flange element.

[0031] In particular, a clamping connection can be formed between the mounting section and the flange element by means of a clamping ring and / or a conical nut. This enables a secure yet material-friendly fixing of the bearing elements in the bearings.

[0032] The sliding seat section of the floating bearing element can be mounted in or on a guide sleeve of the floating bearing in a rotationally fixed but not axially fixed manner. The cross-section of the guide sleeve is preferably complementary to that of the sliding seat section. The guide sleeve can be a component of any design onto which the sliding seat section can be slidably mounted or into which the sliding seat section can be slidably inserted. Preferably, the guide element has a non-rotationally symmetrical cross-section complementary to that of the sliding seat section, so that all rotational degrees of freedom of movement of the sliding seat section relative to the guide section (and thus ultimately rotational movement components of the tanks relative to each other) can be efficiently locked.

[0033] Furthermore, for optimal use of installation space, the flange element and / or the guide sleeve can project at least partially, preferably completely, into the interior of a base body of the inner tank. For example, the inner tank has a corresponding recess or similar feature into which the flange element and / or the guide sleeve protrude. Since, in this design, parts of the floating bearing and / or the fixed bearing are incorporated into the basic shape of the inner tank, the tank system can be made particularly compact.

[0034] The invention is described below by way of example with reference to advantageous embodiments and the accompanying figures. These show, schematically: Fig. 1 a cross-sectional view of a tank system according to the invention; Fig. 2 a perspective view of a loose bearing element; Fig. 3 a perspective view of a fixed bearing element; Fig. 4 a cross-sectional view of the tank system in the area of ​​the bulk storage; and Fig. 5 a cross-sectional view of the tank system in the area of ​​the fixed bearing.

[0035] The one in Fig. The tank system 10 shown for a transport system comprises an inner tank 14 and an outer tank 16. The inner tank 14 is mounted in the outer tank 16 by means of a loose bearing 21 and a fixed bearing 23 forming a gap 18.

[0036] Inside the inner tank 14 is a liquefied gas, such as liquefied hydrogen or liquefied natural gas. Accordingly, very low or even cryogenic temperatures prevail inside the inner tank 14, for example, temperatures of less than 150 Kelvin, preferably less than 50 Kelvin, more preferably less than 10 Kelvin. A high vacuum preferably prevails in the gap 18, for example, a pressure between 10 -3 and 10 -7mbar, so that a temperature equalization between inner tank 14 and outer tank 16 is minimized.

[0037] It is understood that instead of liquefied gas, any type of liquid or gaseous medium 12 can be contained in the inner tank 14. Accordingly, the temperature in the inner tank 14 can also be higher than 150 Kelvin, for example, room temperature, depending on the type and properties of the medium 12. Similarly, a high vacuum is optional. For example, a weak vacuum can be created in the gap 18. However, ambient pressure can also prevail in the gap 18, and / or the gap 18 can be filled with an insulating liquid or gas such as air or an inert gas, or with another insulating material.

[0038] The inner tank 14 and the outer tank 16 have a cylindrical basic shape, the respective longitudinal axes of which run parallel to the axial direction I. Other shapes are also conceivable. For example, the inner tank 14 and / or the outer tank 16 could also have a spherical shape or other forms.

[0039] The fixed bearing 23 is designed such that it essentially prevents all degrees of freedom of movement of the inner tank 14 relative to the outer tank 16; that is, the inner tank 14 is fixed within the outer tank 16 in the area of ​​the fixed bearing 23 against rotation and tension. The floating bearing 21 is also designed to prevent rotation of the inner tank 14, but allows translational movement and / or expansion of the inner tank 14 relative to the outer tank 16 in the axial direction I.

[0040] The loose bearing 21 and the fixed bearing 23 are each arranged on opposite narrow sides 24, 26 of the inner tank 14, centered on the longitudinal axis of the cylindrical shape of the inner tank 14 and the outer tank 16, respectively. Accordingly, the inner tank 14 and the outer tank 16 are arranged coaxially. In particular, the inner tank 14 is arranged with respect to the outer tank 16 such that the gap 18 separating them has substantially the same width on a top surface 11 and a bottom surface 13 of the inner tank 14. However, the loose bearing 21 and the fixed bearing 23 can also be offset with respect to the longitudinal axis. Furthermore, a configuration is conceivable in which the loose bearing 21 and the fixed bearing 23 are each arranged centered on the top and bottom surfaces 11, 13 of the inner tank 14, respectively.

[0041] Furthermore, it is understood that instead of exactly one loose bearing 21 and exactly one fixed bearing 23, two or more loose bearings 21 and / or fixed bearings 23 may be provided for supporting the inner tank 14 in the outer tank 16. The translational degrees of freedom of the loose bearings 21 should be arranged in parallel. For example, at least two fixed bearings 23 may be arranged in the region of the first narrow side 23 of the inner tank 14 and at least two loose bearings 21 in the region of the second narrow side 24 of the inner tank 14, and / or at least two fixed bearings 23 may be arranged in the region of the top 11 of the inner tank 14 and at least two loose bearings 21 in the region of the bottom 13 of the inner tank 14, or vice versa.

[0042] The loose bearing 21 has a loose bearing element 20 and the fixed bearing 23 has a fixed bearing element 22, which are referred to below with reference to the Fig. 2 and Fig. 3 will be described in detail.

[0043] The one in Fig. The loose bearing element 20 shown in Figure 2 has – figuratively speaking – essentially the basic shape of a trumpet with inhomogeneous wall thickness. In the illustrated embodiment, the loose bearing element 20 comprises a base body 33, a conical mounting section 40 adjoining the base body 33, and a sliding seat section 38 extending in the longitudinal direction of the loose bearing element 20.

[0044] The sliding seat section 38 adjoins the base body 33, is arranged on a side of the base body 33 opposite the mounting section 40, and has a non-rotationally symmetric cross-section. The cross-section of the sliding seat section 38 has a rotationally symmetric shape, also known as a P3G shape. However, the cross-section of the sliding seat section 38 can also have any other non-rotationally symmetric cross-section, for example, that of a rectangle or a triangle.

[0045] The base body 33 of the floating bearing element 20 has a contour in which the shape of the fastening section 40 transitions smoothly into the shape of the sliding seat section 38. However, the base body 33 can also have another suitable shape.

[0046] Furthermore, the base body 33 has a thinner wall than the sliding seat section 38, which provides better insulation between the inner tank 14 and the outer tank 16 (see also Fig. 4) In the area of ​​the fastening section 40, a thicker wall thickness can optionally be provided than in the area of ​​the base body 33 in order to offer sufficient fastening stability. Alternatively, the wall thickness of the floating bearing element 20 can also be constant.

[0047] The diameter 42 of the fastening section 40 of the floating bearing element 20, in particular measured at the end face of the fastening section 40, is larger than a radial dimension 44 of the sliding seat section 38 (see Fig. 4) The diameter 42 of the fastening section 40 at its end face can, for example, be 1.5, two, three or four times as large as the radial dimension 44 of the sliding seat section 38.

[0048] The in Fig. Figure 3 shows a fixed bearing element 22 with a rotationally symmetrical conical shape and varying wall thickness. In the illustrated embodiment, the fixed bearing element 22 comprises a conical first mounting section 28, a conical base body 32 adjoining the first mounting section 28, and a conical second mounting section 30 adjoining the base body 32.

[0049] The diameter 34 of the first fastening section 28 of the fixed bearing element 22 is smaller than the diameter 36 of the second fastening section 30 of the fixed bearing element 22, in particular measured at the respective end faces of the fastening sections 28, 30 (see Fig. 5) The diameter 36 of the second fastening section 30 at its end face can, for example, be two, three, four or five times larger than the diameter 34 of the first fastening section 28.

[0050] The base body 32 of the fixed bearing element 22 has a smaller wall thickness than the fastening sections 28, 30, which provides better insulation between the inner tank 14 and the outer tank 16 (see also Fig. 5) However, the wall thickness of the base body 32 and the first fastening section 28 can also be less than the wall thickness of the second fastening section 30, or the wall thickness of the base body 32 and the second fastening section 30 can be less than the wall thickness of the first fastening section 28. Alternatively, the wall thickness of the fixed bearing element 22 can also be constant.

[0051] The floating bearing element 20 and the fixed bearing element 22 are made of a plastic or polymer. Preferably, the plastic is a semi-crystalline thermoplastic polymer. The plastic has a thermal conductivity of less than 1 W / m*K, in particular less than 0.5 W / m*K, preferably 0.25 W / m*K, and / or a modulus of elasticity between 3000 and 5000 MPa, in particular between 3600 and 4800 MPa, preferably between 4100 and 4300 MPa. This ensures optimal insulation between the inner and outer tanks 14, 16, while the bearings 21, 23 simultaneously exhibit high robustness. Furthermore, plastic is easy to process.

[0052] An example of such a plastic is a polyetherketone, such as polyetheretherketone (PEEK). This plastic is particularly well-suited for extreme operating conditions, such as those encountered in high-vacuum and low-temperature applications. Furthermore, PEEK exhibits excellent mechanical and thermal properties. For example, at room temperature, PEEK has a thermal conductivity of approximately 0.25 W / m*K, a modulus of elasticity of approximately 4200 MPa, a tensile strength of approximately 110 MPa, and an elongation at break of approximately 11%.

[0053] As in Fig. As shown in Figure 4, a guide sleeve 46 of the floating bearing 21 is mounted on the outer tank 16, projecting partially into the interior of a base body of the inner tank 14. The floating bearing 21 also includes a first bearing sleeve 48 mounted on the inner tank 14, to which a first flange element 50 is attached. The first bearing sleeve 48 projects into the interior of the base body of the inner tank 14 and accommodates a significant portion of the floating bearing 21. This results in a particularly compact form for the tank system 10. The guide sleeve 46 and the first bearing sleeve 48 are connected to the shells of the tanks 14 and 16, for example, by welding.

[0054] The guide sleeve 46 is designed for the movable mounting of the sliding seat section 38 and has a corresponding, non-rotationally symmetrical cross-section that is complementary to that of the sliding seat section 38, so that the sliding seat section 38 is mounted rotationally fixed but not axially fixed in the guide sleeve 46. Due to the complementary shape, the sleeve 46 and the section 38 bear against each other over a flat surface, resulting in a substantially uniform surface pressure between the outside of the sliding seat section 38 and the inside of the guide sleeve 46. In simplified terms, the sliding seat section 38 can move or shift axially within the guide sleeve 46 relative to the guide sleeve 46, but cannot rotate within the guide sleeve 46.This locks all rotational degrees of freedom, while compensating for expansion or displacement of the inner tank 14 in axial direction I as well as manufacturing inaccuracies.

[0055] The first flange element 50 closes off the first bearing sleeve 48 on the inner tank side in the axial direction I and includes a conical mounting section 52 for mounting the fastening section 40 of the floating bearing element 20. A clamping connection is formed between at least a part of the fastening section 40 and the mounting section 52 by means of a first clamping ring 54, which is fixed to a base body of the first flange element 50 by means of one or more first screws 54. This releasable clamping connection secures the floating bearing element 20 firmly to the inner tank 14, but also allows it to be easily and quickly removed, for example for maintenance work or to replace the floating bearing element 20.

[0056] As in Fig.As shown in Figure 5, the fixed bearing 23 comprises a second bearing sleeve 58, which is mounted to the inner tank 14. A second flange element 60 is mounted to the second bearing sleeve 58, which closes off the second bearing sleeve 58 on the outer tank side in the axial direction I. The second flange element 60 has an internal thread 70 on the inner tank side and a conical third mounting section 76 adjoining it on the outer tank side. For secure axial and rotationally fixed fixation of the fixed bearing element 22 to the inner tank 14, the first mounting section 28 of the fixed bearing element 22 is clamped, at least partially, between the third mounting section 76 of the second flange element 60 and a conical nut 74. The conical nut 74 is pressed onto at least a part of the first mounting section 28 by means of a central screw 72, which is screwed into the internal thread 70 of the second flange element 60.

[0057] The fixed bearing 23 further comprises a third flange element 62 with a second conical mounting section 64 for mounting the second fastening section 30 of the fixed bearing element 22. A clamping connection is formed between at least a part of the second fastening section 30 and the second mounting section 64 by means of a second clamping ring 66, which is fixed to a base body of the third flange element 62 by means of one or more second screws 68.

[0058] The second bearing sleeve 58 is mounted to the inner tank 14, for example by welding. The same applies to the connections between the second flange element 60 and the second guide sleeve, as well as between the third flange element 62 and the outer tank 16.

[0059] In the present embodiment, the bearing sleeve 58 has holes or recesses 78 to save material and reduce thermal conductivity.

[0060] The releasable clamping connection of the respective mounting sections 28, 30 secures the fixed bearing element 22 axially and rotationally to the tanks 14, 16, but it can also be easily and quickly removed, for example for maintenance work or to replace the fixed bearing element 22. However, other forms of fixing the respective mounting sections 28, 30, 40 are also conceivable, such as an adhesive bond or fixing with screws in holes in the mounting sections 28, 30, 40.

[0061] It is understood that the arrangement of the fixed bearing 23 can also be reversed, i.e. the second flange element 60 can also be mounted on the inner tank 14 and the second bearing sleeve 58 on the outer tank 16, including a correspondingly mirrored arrangement of the remaining components of the fixed bearing 23.

[0062] The floating bearing 21 can also comprise more than one floating bearing element 20, and the fixed bearing 23 can comprise more than one fixed bearing element 22, with a corresponding number of the other components of the bearings 21 and 23, respectively. For example, the floating bearing 21 can have two, three, or more floating bearing elements 22, and / or the fixed bearing 21 can have two, three, or more fixed bearing elements 22. In these cases, the floating bearings 21 are designed such that the degrees of freedom defined by them are arranged in parallel.

[0063] In principle, the fastening sections 28, 30, 40 can have anti-rotation features to create a rotationally fixed connection not solely through clamping action. Such features can be, for example, ribs, grooves, or similar elements that interact with complementary features on the corresponding counterparts 74 and / or 76, 64 and / or 66, or 52, 54. A non-rotationally symmetrical shape of the aforementioned components can also provide anti-rotation protection. Reference symbol list: 10 Tank system 11 Top of the inner tank 12 Operating fluid 13 Underside of the inner tank 14 Inner tank 16 External tank 18 Gap between inner and outer tank 20 Loose bearing element 21 Lotlager 22 Fixed bearing element 23 fixed camps 24, 26 Narrow sides of the inner tank 28, 30, 40 fastening sections of the bearing elements 32, 33 Base body of the bearing elements 34, 36, 42 Diameter of the mounting sections 38 Sliding seat section 44 radial dimension of the sliding seat section 46 Guide sleeve 48, 58 bearing sleeves 50, 60, 62 flange elements 52, 64, 76 conical assembly sections 54, 66 clamping rings 56, 68 screws 70 internal threads 72 Central screw 74 Cone nut 78 holes or recesses I axial direction

Claims

[1] Tank system (10) for a transport system, in particular for a motor vehicle, for receiving a gaseous or liquid medium (12), preferably liquefied gas, comprising an inner tank (14) for receiving the medium (12) and an outer tank (16), wherein the inner tank (14) is mounted in the outer tank (16) by means of a loose bearing (21) with a loose bearing element (20) and a fixed bearing (23) with a fixed bearing element (22) to form a gap (18), wherein the floating bearing (21) is designed such that it allows a translational movement and / or an expansion of the inner tank (14) relative to the outer tank (16) in an axial direction (I), and wherein the loose bearing element (20) and / or the fixed bearing element (22) consists at least in sections, in particular completely, of plastic. [2] Tank system (10) according to claim 1, wherein the plastic is polyetheretherketone. [3] Tank system (10) according to claim 1 or 2, wherein the plastic has a thermal conductivity of less than 1.0 W / m*K, in particular less than 0.5 W / m*K, preferably 0.25 W / m*K. [4] Tank system (10) according to one of the preceding claims, wherein the plastic has a modulus of elasticity between 3000 and 5000 MPa, in particular between 3600 and 4800 MPa, preferably between 4100 and 4300 MPa. [5] Tank system (10) according to one of the preceding claims, wherein the inner tank (14) has a cylindrical basic shape whose longitudinal axis runs parallel to the axial direction (I), and / or wherein the outer tank (16) has a cylindrical basic shape whose longitudinal axis runs parallel to the axial direction (I), in particular wherein the inner tank (14) and the outer tank (16) are arranged coaxially. [6] Tank system (10) according to one of the preceding claims, wherein the movable bearing (21) and the fixed bearing (23) are arranged on opposite sides (24, 26) of the inner tank (14), in particular centrally on the longitudinal axis. [7] Tank system (10) according to one of the preceding claims, wherein the loose bearing element (20) and the fixed bearing element (22) are arranged coaxially, in particular coaxially with the axial longitudinal axis of the inner tank (14) and / or the outer tank (16). [8] Tank system (10) according to one of the preceding claims, wherein the fixed bearing element (22) and the loose bearing element (20) each have a base body (32, 33) and each have at least one conical fastening section (28, 30, 40). [9] Tank system (10) according to claim 8, wherein the loose bearing element (20) has exactly one conical fastening section (40), wherein the loose bearing element (20) has a sliding seat section (38) adjoining the base body (33) and opposite the fastening section (40). [10] Tank system (10) according to claim 9, wherein the sliding seat portion (38) has a non-rotationally symmetric cross-section. [11] Tank system (10) according to one of claims 8 to 10, wherein the fixed bearing element (22) has exactly two conical fastening sections (28, 30) opposite one another with respect to the base body (32). [12] Tank system (10) according to one of claims 8 to 11, wherein the base body (32) of the fixed bearing element (22) and / or the base body (33) of the loose bearing element (20) have a conical shape. [13] Tank system (10) according to one of claims 8 to 12, wherein the base body (32) of the fixed bearing element (22) has, at least in sections, a smaller wall thickness than the at least one fastening section (28, 30) of the fixed bearing element (22). [14] Tank system (10) according to one of claims 8 to 13, wherein the base body (33) of the floating bearing element (20) has, at least in sections, a smaller wall thickness than the fastening section (40) of the floating bearing element (20) and / or the sliding seat section (38). [15] Tank system (10) according to at least one of claims 8 to 14, wherein the movable bearing (21) and the fixed bearing (23) each have at least one flange element (50, 60, 62) and the fastening section (28, 30, 40) is fixed axially and rotationally fixed to the flange element (50, 60, 62). [16] Tank system (10) according to claim 15, wherein a clamping connection is formed between the fastening section (28, 30, 40) and the flange element (50, 60, 62) by means of a clamping ring (54, 60, 66) and / or a conical nut (74). [17] Tank system (10) according to one of claims 9 to 16, wherein the sliding seat section (38) of the movable bearing element (20) is mounted in a rotationally fixed but not axially fixed manner in a guide sleeve (46) of the movable bearing (21), the cross section of which is complementary to that of the sliding seat section (38). [18] Tank system according to claim 17, wherein the flange element (50, 60, 62) and / or the guide sleeve (46) protrudes at least partially, preferably completely, into the interior of a base body of the inner tank (14).

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