Fuel tank made of plastic for a motor vehicle

Abstract

The invention relates to a fuel tank (1) made of plastic for a motor vehicle. According to the invention, the tank comprises a shell (2) comprising a first zone (3) and a second zone (4) delimited by a parting plane, an internal armature (5) comprising at least one reinforcing element (6), the reinforcing element (6) comprising at least one central portion (7), a first end (8) and a second end (9), the first end (8) comprising a ventilation valve (80) welded to the first zone (3), the reinforcing element (6) being configured to be in contact with the second zone (4) and under mechanical stress when the pressure inside the tank (1) is lower than the atmospheric pressure and to be free of contact with the second zone (4) and free of mechanical stress when the pressure inside the tank (1) is greater than or equal to the atmospheric pressure, the mechanical stress resulting from contact between the second end (9) and the second zone (4).

Description

Plastic fuel tank for motor vehicle

[0001] The invention relates to the technical field of plastic fuel tanks for motor vehicles and motor vehicles containing such tanks. More particularly, the invention relates to a plastic fuel tank for a motor vehicle comprising an internal reinforcing element configured to be under mechanical stress when the pressure inside the tank is lower than atmospheric pressure and being configured to be free of mechanical stress when the pressure inside the tank is greater than or equal to atmospheric pressure.

[0002] Internal reinforcement elements can be installed inside the tank during its manufacture, at specific locations. Documents US2005 / 016600A1, US8191568B2, US2012 / 037638A1, EP2808193A1 and US2023 / 001784A1 provide examples of such tanks. Different forms of internal reinforcement element exist in order to limit the deformations of plastic fuel tanks generated by pressure variations. An example of a fuel tank comprising an internal reinforcement element for a plastic fuel tank is described in patent application US2017 / 0232834A1, the internal reinforcement element disclosed is in the form of a pillar comprising within it a valve fixed thereto by clipping, said pillar being welded at its ends to the walls of the tank facing each other.

[0003] The internal reinforcement element comprising such a clip-on valve is however limited in its capacity to ventilate the tank.

[0004] The invention aims in particular to overcome these drawbacks of the prior art.

[0005] More specifically, an objective of the invention, in at least one of its embodiments, is to provide a plastic fuel tank for a motor vehicle having a ventilation valve within an internal reinforcing element which makes it possible to obtain a maximum ventilation capacity of the tank.

[0006] According to a particular embodiment, the invention relates to a plastic fuel tank for a motor vehicle,

[0007] According to the invention, such a tank comprises: a shell comprising two zones delimited by a joint plane and forming an internal volume of the tank intended to contain the fuel, the two zones being respectively called first zone and second zone.an internal reinforcement of the tank, said reinforcement comprising at least one internal reinforcement element, said internal reinforcement element comprising at least a central portion, a first end and a second end, the first end comprising a ventilation valve, said valve being welded to the first zone, said internal reinforcement element being configured to be in contact with the second zone and under mechanical stress when the pressure inside the tank is lower than atmospheric pressure and being configured to be free of contact with the second zone and free of mechanical stress when the pressure inside the tank is greater than or equal to atmospheric pressure, said mechanical stress being exerted along an axis perpendicular to the internal surface of the two zones of the shell, said mechanical stress resulting from contact between the second end of the internal reinforcement element and the second zone.

[0008] The general principle of the invention is based on the fact that the internal reinforcing element comprises at least a central part, a first end and a second end, the first end comprising a ventilation valve, said valve being welded to the first zone, said internal reinforcing element being configured to be in contact with the second zone and under mechanical stress when the pressure inside the tank is lower than atmospheric pressure and being configured to be free of contact with the second zone and free of mechanical stress when the pressure inside the tank is greater than or equal to atmospheric pressure, said mechanical stress being exerted along an axis perpendicular to the internal surface of the two zones of the shell, said mechanical stress resulting from contact between the second end of the internal reinforcing element and the second zone.

[0009] Thus, the invention is based on a completely new and inventive approach to an internal reinforcement element comprising a ventilation valve welded to the first zone of the shell of the fuel tank on the one hand and on the other hand such that this same internal reinforcement element is configured to be in contact with the second zone and under mechanical stress when the pressure inside the tank is lower than atmospheric pressure and is configured to be free of contact with the second zone and free of mechanical stress when the pressure inside the tank is greater than or equal to atmospheric pressure, said mechanical stress being exerted along an axis perpendicular to the internal surface of the two zones of the shell, said mechanical stress resulting from contact between the second end of the internal reinforcement element and the second zone.Such an arrangement makes it possible, on the one hand, to position the ventilation valve within the tank so as to obtain a maximum ventilation capacity of the tank but also, on the other hand, to reduce the stresses exerted on the weld between the ventilation valve and the first zone of the shell when the pressure prevailing in the tank is greater than or equal to atmospheric pressure. In other words, when the pressure inside the tank is lower than atmospheric pressure, the second end of the internal reinforcement element and the second zone are in contact with each other, on the other hand, when the pressure inside the tank is greater than or equal to atmospheric pressure, the second end of the internal reinforcement element and the second zone are free from contact with each other.

[0010] The expression "internal reinforcing element" means an internal structural element of the tank made of plastic material limiting the deformation of the tank when pressurized.

[0011] The term "pressure inside the tank" means the pressure in the vapor dome of the fuel tank.

[0012] The expression "the pressure inside the tank is lower than atmospheric pressure" means that the tank is under vacuum.

[0013] The expression "the second end of the internal reinforcing element and the second zone are free from contact with each other" does not exclude the possibility that there may be contact between the second end of the internal reinforcing element and the second zone of the shell, but in this case it is a contact without contact pressure or mechanical stress.

[0014] Advantageously, the plastic fuel tank for a motor vehicle according to the invention is such that the internal reinforcing element has the shape of a pillar.

[0015] Thus, an internal reinforcement element in the form of a pillar provides an element that supports optimized compression and bending forces.

[0016] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the second end of the internal reinforcing element has at least one flat outer face parallel to the inner surface of the second zone of the shell which it faces.

[0017] Thus, such a second end of the internal reinforcing element having at least one flat outer face parallel to the inner surface of the second zone of the shell which it faces makes it possible to reduce the risk of tearing of the shell coming into contact with said second end when the pressure inside the tank is greater than or equal to atmospheric pressure.

[0018] According to a preferred embodiment of the previous mode, the plastic fuel tank for a motor vehicle according to the invention is such that the second end has a rounded edge.

[0019] Thus, a second end having a rounded edge makes it possible to reduce the risk of damage to the hull in contact with said second end, particularly when the pressure inside the tank is significantly lower than atmospheric pressure.

[0020] According to a preferred embodiment of either of the two preceding embodiments, the plastic fuel tank for a motor vehicle according to the invention is such that the at least one flat outer face extends in whole or in part by a region curved towards the interior of the tank.

[0021] Thus, a second end having at least one flat outer face extending in whole or in part by a curved region towards the interior of the tank makes it possible to better absorb the stresses and to reduce the risk of damage to the hull when the pressure prevailing inside the tank is significantly lower than atmospheric pressure.

[0022] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the central zone of the internal reinforcing element comprises a means of attachment to the internal frame.

[0023] Thus, the presence of a fixing means at the central zone of the internal reinforcement element allows an optimized fixing of the internal reinforcement element to the internal reinforcement on the one hand but also on the other hand a localization of the internal reinforcement in the central part of the tank.

[0024] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the internal reinforcing element comprises a U-shaped, V-shaped, X-shaped, Y-shaped or W-shaped section in a cross-sectional plane.

[0025] Thus, an internal reinforcing element comprising a U-, V-, X-, Y- or W-shaped section in a cross-sectional plane has better resistance to the mechanical stresses to which the internal reinforcing element is subjected.

[0026] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the contact surface between the first end of the internal reinforcing element and the shell of the tank is less than or equal to, preferably less than, the contact surface between the second end of the internal reinforcing element and the shell of the tank when the pressure inside the tank is lower than atmospheric pressure.

[0027] Thus, a contact surface between the first end of the internal reinforcing element and the shell of the tank less than or equal to, preferably less than, the contact surface between the second end of the internal reinforcing element and the shell of the tank when the pressure inside the tank is less than atmospheric pressure makes it possible to ensure that the pressure exerted by the mold during the manufacture of the tank is distributed over the entire second end which is not welded and is transferred to the other side over the entire welded zone of the ventilation valve.

[0028] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the internal reinforcing element comprises a section of smaller surface area.

[0029] Thus, an internal reinforcement element comprising a smaller surface area section has a lower mechanical resistance point allowing the latter to break in order to avoid deterioration in the quality of the ventilation valve attachment to the first area of ​​the shell during excessive mechanical stresses.

[0030] According to a preferred embodiment of the previous mode, the plastic fuel tank for a motor vehicle according to the invention is such that the section with the smallest surface area is located in the central part of the internal reinforcing element.

[0031] Thus, an internal reinforcing element having a smaller surface area section located in the central part makes it possible to have a breaking point of the internal reinforcing element far from the first and second zones of the hull, such an arrangement makes it possible to reduce the risks of damage to the hull by the internal reinforcing element broken at the level of the smaller surface area section.

[0032] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the second zone of the shell comprises a means for locking the second end of the internal reinforcing element.

[0033] The expression "second end locking means" is understood to mean a locking means limiting, preferably preventing, a displacement of the internal reinforcement element relative to the weld of the ventilation valve, said ventilation valve being welded to the first zone of the shell. In other words, said locking means aims to limit, preferably to prevent, a displacement of the second end of the internal reinforcement element on the inner surface of the second zone of the shell.

[0034] Thus, the presence of a means for locking the second end makes it possible to reduce the risks of damage to the weld between the ventilation valve and the first zone of the shell by limiting the constraints linked to the movement of the internal reinforcement element relative to its axis of orientation between the first and second zones of the shell.

[0035] According to a preferred embodiment of the previous embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the locking means comprises at least one fold of the second zone of the shell towards the inside of the tank, preferably the locking means consists of a fold of the second zone of the shell towards the inside of the tank.

[0036] Thus, a locking means comprising at least one fold of the second zone of the shell towards the inside of the tank makes it possible to have a locking means which does not require an additional step linked to the insertion and fixing of said locking means within the tank during the manufacture of the fuel tank, said locking means being formed during the step of blowing a parison within a mold.

[0037] According to a preferred embodiment of the previous mode, the plastic fuel tank according to the invention is such that the at least one fold of the second zone of the shell towards the inside of the tank circumscribes the periphery of the surface of the second end coming into contact with the inner wall of the second zone of the shell.

[0038] Thus, the presence of a blocking means in the form of at least one fold of the second zone of the shell towards the inside of the tank circumscribing the periphery of the surface of the second end coming into contact with the inner wall of the second zone of the shell makes it possible to have a blocking means limiting a movement of the second end of the internal reinforcement element on the inner surface of the second zone of the shell in any direction.

[0039] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the second end of the internal reinforcing element is fixed to the central part by gluing and / or screwing.

[0040] Thus a second end fixed to the central part by gluing and / or screwing allows for an internal reinforcement element to be easily adapted to a modification of the blocking element.

[0041] According to an alternative embodiment of the previous embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the second end and the central part of the internal reinforcing element form a single-piece structure.

[0042] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the ventilation valve is fixed to the first end by a fixing means, preferably by a clipping means.

[0043] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that it comprises an external reinforcing element on the second zone of the shell, said external reinforcing element being located on an external face of the second zone of the shell opposite the contact zone between the second end of the internal reinforcing element and the second zone of the shell. Preferably, the external reinforcing element is in the form of a reinforcing sheet made up of fibers coated in polyethylene, preferably high-density polyethylene.

[0044] Thus, the presence of an external reinforcing element makes it possible to avoid deterioration of the second zone of the hull subjected to mechanical stresses in the contact zone between the second zone of the hull and the second end of the internal reinforcing element.

[0045] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the internal reinforcing element comprises a zone deformable under the effect of mechanical stress, said deformable zone being configured to allow relative movement of two rigid parts relative to each other under the effect of mechanical stress, the deformable zone preferably comprising at least two tabs comprising at least one corrugation along their length, the corrugation comprising at least one crest and at least one trough, said tabs being arranged head to tail relative to each other in the direction of their length, the corrugation of a tab being located in a plane parallel to the corrugation plane of the adjacent tab,the corrugation plane of a tab being a plane parallel and distinct from the corrugation plane of the adjacent tab when the corrugations of the two tabs are in phase opposition.,

[0046] According to the invention, the term "rigid" is understood in contrast to the term "deformable". Thus, the term "rigid part" refers to a part of the reinforcement which is significantly more resistant to deformation than a "deformable" zone. Conversely, the term "deformable zone" refers to a zone of the internal reinforcing element which is significantly less resistant to deformation than a rigid part of the internal reinforcing element. In other words, the deformable zone of an internal reinforcing element is the zone which deforms if the internal reinforcing element is subjected to an external stress applied to the parts of the internal reinforcing element which are not deformed and which are, consequently, designated rigid.

[0047] The term "undulation of a tongue" is understood to mean a sinusoidal configuration extending obliquely relative to the longitudinal axis of the tongue, the undulation of the tongue considered being seen from the edge, in other words the undulation of the tongue considered being in profile.

[0048] The expression "tabs arranged head to tail in relation to each other in the direction of their length" means two tabs placed parallel but in opposite directions in relation to each other.

[0049] According to a preferred embodiment, the plastic fuel tank for a motor vehicle according to the invention is such that the internal reinforcement of the tank comprising at least the internal reinforcing element is fixed to the internal surface of the first zone and the second zone of the shell, preferably by welding.

[0050] The invention also relates to a motor vehicle comprising a plastic fuel tank as described above.

[0051] Other characteristics and advantages of the invention will appear more clearly on reading the following description of a preferred embodiment, given as a simple illustrative and non-limiting example, and the appended drawings, among which:1 shows a cross-section of a part of the tank according to the invention.1 illustrates a different view of the part of the tank according to the invention presented in the.1 describes the attachment of the ventilation valve to the first zone of the shell of the tank according to the invention.1 illustrates more specifically the internal reinforcement element intended to be integrated within a tank according to the invention.

[0052] In connection with the, an embodiment of the plastic fuel tank 1 for a motor vehicle according to the invention is presented. The tank 1 consists of a shell 2 comprising two zones 3, 4 delimited by a joint plane and forming an internal volume of the tank 1 intended to contain the fuel. The two zones 3, 4 are respectively called first zone 3 and second zone 4. The tank 1 is provided with a frame 5 internal to the tank 1. The frame 5 comprises at least one internal reinforcing element 6, said internal reinforcing element 6 comprising at least one central part 7, a first end 8 and a second end 9. The first end 8 comprises a ventilation valve 80, said valve 80 being welded to the first zone 3. The ventilation valve 80 is fixed to the first end 8 by a fixing means 82, the fixing means 82 is preferably a clipping means.The internal reinforcing element 6 is configured to be in contact with the second zone 4 and under mechanical stress when the pressure inside the tank 1 is lower than atmospheric pressure and is configured to be free of contact with the second zone 4 and free of mechanical stress when the pressure inside the tank 1 is greater than or equal to atmospheric pressure, said mechanical stress being exerted along an axis perpendicular to the internal surface of the two zones 3, 4 of the shell 2. The mechanical stress results from contact between the second end 9 of the internal reinforcing element 6 and the second zone 4 of the shell 2. The internal reinforcing element 6 is in the form of a pillar having at the central zone 7 a U-shaped section in a cross-sectional plane 60. It is observed that the central zone 7 of the internal reinforcing element 6 has a means 70 of attachment to the internal frame 5.It is noted that the second end 9 of the internal reinforcing element 6 has at least one flat outer face 90 parallel to the inner surface 40 of the second zone 4 of the shell 2 to which it faces, the flat outer face 90 extending in whole or in part by a curved region 92 towards the inside of the tank 1. The second end 9 also has a rounded edge 91. Furthermore, it is noted that the contact surface between the first end 8 of the internal reinforcing element 6 and the shell 2 of the tank 1 is less than or equal to, preferably less than, the contact surface between the second end 9 of the internal reinforcing element 6 and the shell 2 of the tank 1 when the pressure inside the tank 1 is lower than atmospheric pressure. The internal reinforcing element 6 comprises a section of smaller surface area, said section of smaller surface area being located in the central part 7 of the reinforcing element 6.The second end 9 of the internal reinforcing element 6 is preferably fixed to the central part 7 by a fixing means 93 which is preferably a screw 930. The second zone 4 of the shell 2 comprises a locking means 41 of the second end 9. This locking means 41 is in the form of a fold of the second zone 4 of the shell 2 towards the inside of the tank 1, preferably the locking means 41 consists of a fold of the second zone 4 of the shell 2 towards the inside of the tank 1. The fold 41 of the second zone 4 of the shell 2 towards the inside of the tank 1 circumscribes the periphery of the surface 90 of the second end 9 coming into contact with the inner wall of the second zone 4 of the shell 2.

[0053] Illustrates a different view of the tank portion 1 shown in the. The tank 1 comprises a shell 2 comprising two zones 3, 4 delimited by a joint plane and forming an internal volume of the tank 1 intended to contain the fuel, the two zones 3, 4 being respectively called first zone 3 and second zone 4. The tank 1 also comprises a frame 5 internal to the tank, said frame 5 comprises at least one internal reinforcing element 6, said internal reinforcing element 6 comprising at least a central portion 7, a first end 8 and a second end 9. The first end 8 comprises a ventilation valve 80, said valve 80 being welded to the first zone 3.The internal reinforcing element 6 is configured to be in contact with the second zone 4 and under mechanical stress when the pressure inside the tank 1 is lower than atmospheric pressure and is configured to be free of contact with the second zone 4 and free of mechanical stress when the pressure inside the tank 1 is greater than or equal to atmospheric pressure, said mechanical stress being exerted along an axis perpendicular to the internal surface of the two zones 3, 4 of the shell 2. The mechanical stress results from contact between the second end 9 of the internal reinforcing element 6 and the second zone 4 of the shell 2. The internal reinforcing element 6 has a pillar shape having a U-shaped section in a cross-sectional plane 60. The central zone 7 of the internal reinforcing element 6 has a means 70 for fixing to the internal frame 5.It is noted that the second end 9 of the internal reinforcing element 6 has at least one flat outer face 90 parallel to the inner surface 40 of the second zone 4 of the shell 2 to which it faces, the flat outer face 90 extends in whole or in part by a curved region 92 towards the inside of the tank 1. The second end 9 also has a rounded edge 91. In addition, it is noted that the contact surface between the first end 8 of the internal reinforcing element 6 and the shell 2 of the tank 1 is less than or equal to, preferably less than, the contact surface between the second end 9 of the internal reinforcing element 6 and the shell 2 of the tank 1 when the pressure inside the tank 1 is lower than atmospheric pressure. The internal reinforcing element 6 comprises a section of smaller surface, said section of smaller surface is located in the central part 7 of the internal reinforcing element 6.The second end 9 of the internal reinforcing element is preferably fixed to the central part 7 by a fixing means 93 which is preferably a screw 930. The second zone 4 of the shell 2 comprises a locking means 41 of the second end 9. This locking means 41 is in the form of a fold of the second zone 4 of the shell 2 towards the inside of the tank 1, preferably the locking means 41 consists of a fold of the second zone 4 of the shell 2 towards the inside of the tank 1. The fold of the second zone 4 of the shell 2 towards the inside of the tank 1 circumscribes the periphery of the surface 90 of the second end 9 coming into contact with the inner wall of the second zone 4 of the shell 2.

[0054] The invention describes the attachment of the ventilation valve 80 to the first zone 3 of the shell 2 of the tank 1 according to the invention by welding. The welding of the ventilation valve 80 to the first zone 3 of the shell 2 is carried out using a welding patch 81, the ventilation valve 80 forming part of the first end 8 of the internal reinforcement element 6. The ventilation valve is attached to the internal reinforcement element 6 using a fastening means 82 which is provided with a clipping means.

[0055] The illustration shows an internal reinforcing element 6 comprising a central portion 7 provided with a means 70 for fixing to the internal frame, a first end 8 and a second end 9. The first end 8 comprises a ventilation valve 80, said valve 80 comprising a welding patch 81. The ventilation valve 80 is fixed to the first end 8 by a fixing means 82, the fixing means 82 is preferably a clipping means. The second end 9 of the internal reinforcing element 6 has at least one flat outer face 90, the flat outer face 90 extending in whole or in part by a curved region 92. The second end 9 also has a rounded edge 91.

Claims

Plastic fuel tank (1) for a motor vehicle, said tank (1) comprising:a shell (2) comprising two zones (3, 4) delimited by a joint plane and forming an internal volume of the tank intended to contain the fuel, the two zones (3, 4) being respectively called first zone (3) and second zone (4).a frame (5) internal to the tank, said frame (5) comprising at least one internal reinforcing element (6),said internal reinforcing element (6) comprising at least a central part (7), a first end (8) and a second end (9), the first end (8) comprising a ventilation valve (80), said valve (80) being welded to the first zone (3),the plastic fuel tank (1) for a motor vehicle being characterized in that said internal reinforcing element (6) is configured to be in contact with the second zone (4) and under mechanical stress when the pressure inside the tank (1) is lower than atmospheric pressure and configured to be free of contact with the second zone (4) and free of mechanical stress when the pressure inside the tank (1) is greater than or equal to atmospheric pressure, said mechanical stress being exerted along an axis perpendicular to the internal surface of the two zones (3, 4) of the shell (2), said mechanical stress resulting from contact between the second end (9) of the internal reinforcing element (6) and the second zone (4)., Plastic fuel tank (1) for a motor vehicle according to claim 1, such that the internal reinforcing element (6) has a pillar shape. Plastic fuel tank (1) for a motor vehicle according to any one of the preceding claims, such that the second end (9) of the internal reinforcing element (6) has at least one flat outer face (90) parallel to the inner surface (40) of the second zone (4) of the shell (2) which it faces. Plastic fuel tank (1) for a motor vehicle according to claim 3, such that the second end (9) has a rounded edge (91). Plastic fuel tank (1) for a motor vehicle according to any one of claims 3 or 4, such that the at least one flat outer face (90) extends in whole or in part by a curved region (92) towards the interior of the tank (1). Plastic fuel tank (1) for a motor vehicle according to any one of the preceding claims, such that the central zone (7) of the internal reinforcing element (6) comprises a means (70) for attachment to the internal frame (5). A plastic fuel tank for a motor vehicle according to any preceding claim, such that the internal reinforcing element (6) comprises a U-, V-, X-, Y- or W-shaped section in a cross-sectional plane (60). Plastic fuel tank (1) for a motor vehicle according to any one of the preceding claims, such that the contact surface between the first end (8) of the internal reinforcing element (6) and the shell (2) of the tank (1) is less than or equal to, preferably less than, the contact surface between the second end (9) of the internal reinforcing element (6) and the shell (2) of the tank (1) when the pressure inside the tank (1) is lower than atmospheric pressure. A plastic fuel tank (1) for a motor vehicle according to any preceding claim, such that the internal reinforcing element (6) comprises a section of smaller surface area. Plastic fuel tank (1) for a motor vehicle according to the preceding claim, such that the section with the smallest surface area is located in the central part (7) of the internal reinforcing element (6). Plastic fuel tank (1) for a motor vehicle according to any one of the preceding claims, such that the second zone (4) of the shell (2) comprises a means (41) for locking the second end (9) of the internal reinforcing element (6). Plastic fuel tank (1) for a motor vehicle according to the preceding claim, such that the locking means (41) comprises at least one fold of the second zone (4) of the shell (2) towards the inside of the tank (1). Plastic fuel tank (1) for a motor vehicle according to the preceding claim, such that the at least one fold of the second zone (4) of the shell (2) towards the inside of the tank (1) circumscribes the periphery of the surface (90) of the second end coming into contact with the inner wall of the second zone (4) of the shell (2). Plastic fuel tank (1) for a motor vehicle according to any one of the preceding claims, such that the second end (9) of the internal reinforcing element (6) is fixed to the central part (7) by gluing and / or screwing. A motor vehicle comprising a plastic fuel tank according to any preceding claim.

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