Multi-part riveting system and method for the demountable arrangement of a first element and a second element one above the other on a base body, in particular for a high-voltage battery system of a motor vehicle

Abstract

A multi-part riveting system comprising at least one rivet body (50) and a rivet pin (10) designed to interact with the rivet body (50), wherein the rivet body (50) comprises a rivet body head section (54) and a rivet body shank section (56), wherein the rivet pin (10) comprises a rivet pin head section (14) and a rivet pin shank section (16), and wherein the rivet body (50) further comprises a rivet body through-opening (58) for inserting the rivet pin shank section (16), wherein the rivet body shank section (56) comprises at least one movable fixing element (62), and the rivet pin shank section (16) comprises an expanding section designed to interact with the fixing element (62), wherein the expanding section is designed such that, in the intended final assembly position, it acts as a locking element in the rivet body through-hole (58) can be positioned,that the mobility of the rivet body (50) is restricted or completely prevented, characterized in that at least one clamping element (32, 70) is provided with a clamping element through-opening (34) which is adapted to the rivet body shank section (56) and / or to the rivet pin shank section (16) in such a way that the clamping element (32, 70) can be clamped onto the rivet body shank section (56) or onto the rivet pin shank section (16) by placing it on the rivet body shank section (56) or onto the rivet pin shank section (16).

Description

[0001] The invention relates to a multi-part riveting system and a method for the demountable arrangement of a first element and a second element one above the other on a base body, in particular on an opening of a base body.

[0002] The riveting system and the method are intended to be particularly suitable for, and implemented in, a high-voltage battery system of a motor vehicle. Reference is also made to high-voltage battery systems of motor vehicles and to motor vehicles with such high-voltage battery systems.

[0003] The opening in the base body can be a through opening or a blind hole. Preferably, at least one through opening is formed in both the first and second elements. The invention serves to attach the first and second elements to the base body using these through openings, in particular in such a way that simple assembly and non-destructive disassembly are possible.

[0004] High-voltage battery systems in motor vehicles require the installation of cover elements on the top of battery modules or battery systems, particularly those required for fire protection. This applies especially to battery systems consisting of multiple battery modules and / or a large number of interconnected battery cells, providing a system voltage exceeding 48 V, and in particular at least 100 V, 200 V, or 400 V. Most system voltages range from 200 V to 1,000 V, and most commonly from 400 V to 800 V.

[0005] Conventional high-voltage battery systems, particularly those comprised of multiple battery modules, typically incorporate high-voltage connectors. These connectors are usually protected by a primary cover to shield them from direct contact with gases present within the battery system, both from above and, in some cases, from the sides. In practice, a secondary cover is often installed above this primary cover to protect additional components from above, especially those located laterally alongside the high-voltage connectors. These components may include individual electrical wires, wiring harnesses, and / or control units.In known systems, such components are arranged in the area of ​​a central tunnel located between two rows of battery modules, with high-voltage connectors arranged parallel to each other in the outer area of ​​the central tunnel.

[0006] From EP 1 353 079 A1, a two-part plastic rivet is known, consisting of a pin element and a rivet body element. The rivet body element has a flange with adjoining expansion elements that can be pressed through a bore and are then held in an expanded position by inserting and snapping the pin element into the rivet body element. The plastic rivet is intended to fix a first element to a second element. Due to its design, non-destructive disassembly does not appear to be possible. Furthermore, it is not disclosed that the plastic rivet is intended to be used to mount a first element and a second element to a base body.

[0007] German patent G 85 20 666 U1 discloses an arrangement for attaching a strip to a support, comprising several retaining elements with undercuts, mounted on the support. The strip is clamped to these elements by pressing on a substantially C-shaped foot, its claw-shaped side strips engaging behind the undercut retaining elements. The retaining elements are designed as pyramidal or truncated cone-shaped discs with a collar at their base, and their end furthest from the base is attached to the support. The disc can be designed as the head of an expansion rivet, the shank of which sits in a bore in the support. Due to the design, non-destructive disassembly does not appear to be possible with this arrangement. Furthermore, it is not disclosed that the retaining elements are intended to be used to mount a first element and a second element to a base body.

[0008] The invention is based on the objective of providing a riveting system and a method for the demountable arrangement of a first element and a second element one above the other on a base body, by means of which simple assembly and disassembly of a first element and a second element one above the other on a base body is possible.

[0009] The problem is solved according to the invention by the features of the independent claims. Further practical embodiments and advantages of the invention are described in connection with the dependent claims.

[0010] A multi-part riveting system according to the invention comprises at least one rivet body and a rivet pin designed to interact with the rivet body. The rivet body has a rivet head section and a rivet shank section. The rivet pin also has a rivet head section and a rivet shank section. Furthermore, the rivet body has a through-hole for inserting the rivet shank section. The rivet shank section has at least one movable locking element, in particular in the form of a detent element with an optional locking contour.The rivet pin shank section has an expanding section designed for interaction with the fixing element. This expanding section is configured such that, in the intended final assembly position, it can be positioned as a locking element in the rivet body through-hole in such a way that the movement of the rivet body is restricted or completely prevented. This is achieved in particular by direct or indirect interaction of the expanding section with the fixing element.

[0011] A separating element can serve as a fixing element, in particular one with one or more movable legs that can be spread outwards to create a force-fit connection, especially by means of a fixing area formed on the rivet shank section. A detent element can also serve as a fixing element, alternatively or additionally creating a positive-locking connection by detenting. It is also possible to create both a positive-locking and a force-locking connection with the fixing element to fix the rivet body in a base body. In this context, particular reference is made to the possibility of providing a detent element with a locking contour as a fixing element.

[0012] The riveting system according to the invention allows a first element and a second element to be easily mounted and dismounted one above the other on a base body. This is made possible in particular by the fact that both the rivet body and the rivet pin can be inserted into a through-opening of a first element, a second element, and a base body without creating a permanent connection during assembly. The connection of the riveting system is essentially secured by the fact that the expanding section, in the intended final assembly position, is positioned as a locking element in the rivet body through-opening such that the movement of the rivet body is restricted or completely prevented.

[0013] A movable fixing element is understood to be, in particular, an elastically deflectable element that has an elongated shape and is designed to be flexible due to its elongated shape. Preferably, several movable fixing elements are formed on a rivet body of a rivet system according to the invention, in particular 2, 3, 4 or more elongated fixing elements which have a cross-section shaped like circular segments.A restriction or complete prevention of the movement of such a fixing element can be achieved in particular by introducing a sufficiently wide – preferably solid – fixing element as a locking contour into the rivet body through-hole, so that the fixing elements remain in a specific, radially flared position because they are fixed by friction and / or form locking (if the fixing element is designed as a detent element with a locking contour).

[0014] In a practical embodiment of a riveting system according to the invention, the front end section of the rivet body shank section and / or the rivet pin shank section tapers conically towards the front end, with a radial taper formed at a distance from the front end. Such a radial taper is understood to be, in particular, an undercut, preferably designed as a radial shoulder. Preferably, a locking contour extending radially (especially preferably exclusively in a radial direction) is formed on the shoulder, which serves to secure the rivet body and / or the rivet pin in another element (in particular, in a base body) after the rivet body shank section or the rivet pin shank section has been inserted into a through-opening of the other element.The radial taper can also serve as a retention device for a clamping element, which can be advantageously used in conjunction with a riveting system according to the invention. The use of one or more clamping elements will be discussed below.

[0015] In a further practical embodiment of a riveting system according to the invention, at least one clamping element with a clamping element through-opening is provided, which is such that the clamping element can be clamped onto the rivet body shank section and / or the rivet pin shank section by simply placing it on top of the rivet body shank section or the rivet pin shank section. With one or more of the aforementioned clamping elements, the rivet pin and / or the rivet body of a riveting system according to the invention can be pre-fixed relative to a first element and / or a second element. This is particularly advantageous if the first element or the second element has an opening that is significantly larger in the radial direction than the respective shank section of the rivet pin or the rivet body.

[0016] In another practical embodiment of a riveting system according to the invention, both a rivet body clamping element and a rivet pin clamping element are provided. In this case, both the rivet body and the rivet pin can be pre-fixed relative to the elements to be mounted, i.e., the first element and the second element.

[0017] The clamping effect of a clamping element of a riveting system according to the invention can be achieved particularly easily and effectively if at least two clamping tabs are provided on the clamping element, each extending over a portion of the outer circumference of the clamping element's through-hole. In this case, the clamping tabs exhibit higher flexural elasticity compared to a through-hole extending over the entire circumference, so that, depending on the respective thickness of the clamping element, the clamping element can be designed in such a way that, on the one hand, it can be easily fitted onto the shank section of the rivet body or rivet pin, and on the other hand, a sufficient clamping effect is achieved with the clamping element.

[0018] Two or more clamping tabs on a clamping element can be achieved particularly easily from a manufacturing perspective by providing two C-shaped or X-shaped recesses that partially extend through the through-holes. For example, a single X-shaped recess with mutually perpendicular directions of extension can provide a total of four clamping tabs. Two C-shaped recesses, arranged symmetrically to each other, can easily create two clamping tabs with different sized contact surfaces with the shank of a rivet pin or rivet body.

[0019] If at least one disassembly contour for gripping a disassembly tool is formed on the rivet head section, the disassembly of a rivet can be simplified. In this regard, particular reference is made to pulling contours in the form of a bracket or several brackets, which can be used with a rod or hook to pull a rivet head out of a rivet body through-hole. Furthermore, reference is made to a suitably designed projection that can be used to grip a tool, for example, a gripping tool in the form of pliers. Such a projection can also be designed with an undercut to facilitate gripping with the gripping tool. Finally, reference is made to the design of an opening or undercut in the area of ​​the head section, which can be used to insert a simple lever tool into the undercut or undercut.to insert the rivet pin through the rivet body opening and lever it out. Forming an undercut or through-hole is particularly preferred, as this requires no additional material or cavity.

[0020] The invention also relates to a method for fastening a first element and a second element to a base body using a rivet system as described above, wherein the rivet pin with its rivet pin shank section is first inserted into a through-opening of the first element and the rivet body with its rivet body shank section is inserted into a through-opening of the second element and into a through-opening of the base body, and wherein subsequently, by inserting the rivet body shank section into the rivet pin through-opening, the spreading section of the rivet pin shank section is brought into such a relative position to the rivet body that the mobility of the rivet body is restricted or completely prevented.Reference is hereby made once again to the advantages already described above in connection with the riveting system according to the invention, in particular to the possibility of being able to dismantle the riveting system again by pulling out the rivet pin.

[0021] In a practical embodiment of the method according to the invention, the through-opening of the first element is significantly larger than the maximum radial extent of the rivet pin shank section, and a rivet pin clamping element is used to pre-fix the rivet pin relative to the first element by clamping the rivet pin clamping element to the rivet pin shank section. This enables efficient preparation of the entire assembly process, so that, in particular, a first element with a rivet pin already attached to it can be delivered pre-assembled to an assembly line in order to carry out final assembly in the most time-saving way possible, especially at an automotive manufacturer.

[0022] In a further practical embodiment of the method according to the invention, the rivet pin is first pre-assembled relative to the first element and the rivet body shank section is inserted into corresponding through-openings of the second element and the base body for pre-assembly of the second element relative to the base body, in order to subsequently effect a fixation of the rivet pin in the rivet body - in particular force-fit - and a fixation of the first element and the second element relative to the base body - preferably form-fit - by inserting the pre-assembled rivet pin with its rivet pin shank section into the rivet body through-opening.With a force-fit arrangement of the rivet pin in the rivet body and a resulting form-fit fixing of the first element and the second element to the base body, a particularly efficient assembly of the first and the second element to the base body can be carried out, which on the one hand enables a secure connection of the first element and the second element to the base body and yet allows subsequent disassembly of the two elements from the base body.

[0023] Further practical embodiments of the invention are described below in connection with the drawings. They show: Fig. 1 a rivet pin of an embodiment of a multi-part rivet system in an opening of a first element in an isometric view from obliquely above, Fig. 2. remove the rivet pin inserted into the opening of the first element. Fig. 1 in an isometric view from a low angle with a clamping element attached to the rivet pin, Fig. 3 a side view of the arrangement from the Fig. 1 and Fig. 2, Fig. 4 a rivet body of the multi-part rivet system in an opening of a second element in an isometric view from obliquely above, Fig. 5 the rivet body inserted into the opening of the second element Fig. 4 in an isometric view from a low angle with a clamping element attached to the rivet pin, Fig. 6 a side view of the arrangement from the Fig. 4 and Fig. 5, inserted into a base body, Fig. 7 an enlarged representation of the in Fig. 6 of the area marked with VII, Fig. 8 the clamping element from Fig. 2 in an isometric representation, Fig. 9 the arrangement from Fig. 9 in an isometric half-section view, Fig. 10 the arrangement from Fig. 9, which additionally includes the arrangement of Fig. 3 was introduced, in an isometric half-section view, Fig. 11 the arrangement of the first element with the rivet pin and the clamping element made of Fig. 2 during disassembly in an isometric view, Fig. 12 a section of a high-voltage battery system of a motor vehicle with two high-voltage connectors in a top view, Fig. 13 the two high-voltage connectors, each with a first element arranged on it in the form of a high-voltage connector cover and four rivet pins and Fig. 14 a similar section of the high-voltage battery system as in Fig. 12, wherein the high-voltage connectors are each connected to the in Fig. The 13 high-voltage connector covers shown are covered (in Fig. 14 not visible) and additionally a second element in the form of a central tunnel cover is arranged over the high-voltage connector covers.

[0024] In the Fig. 1 to Fig. Figure 3 shows a rivet pin 10 inserted into an opening of a first element 12. The rivet pin 10 has a rivet pin head section 14 and a rivet pin shank section 16. The rivet pin head section 14 extends radially further outwards than the opening in the first element 12. Thus, the rivet pin head section 14 serves as a stop element when the rivet pin shank section 16 is passed through the opening of the first element 12, as shown in the figures. Fig. 1 to Fig. 3 shown.

[0025] As in the Fig. 1 and Fig. As can be clearly seen in Figure 3, the rivet head section 14 in the embodiment shown has a smooth upper surface 18.

[0026] As can be seen further in the area marked K, the radial extent of the rivet head section 14 is less in the area of ​​a lower surface 20, which rests on the first element 12, than in the area of ​​the upper surface 18. The rivet head section 14 thus has an undercut 22, which in the illustrated embodiment extends over the entire circumference of the rivet head section 14. The undercut 22 serves as a point of engagement for a lever tool for disassembly, in particular for a screwdriver or a similar tool.

[0027] The rivet pin shank section 16 has a noticeably greater length IS than the rivet pin head section 14. The rivet pin shank section 16 comprises a clamping section KA directly adjoining the rivet pin head section 14, a central section MA adjoining the clamping section KA, and a front section VA. In the region of the central section MA, the rivet pin shank section 16 is tapered and has longitudinally extending ribs 24. In the illustrated embodiment, a total of four ribs 24 are arranged distributed around the circumference. This results in a sufficiently rigid structure that is weight-optimized.

[0028] In the area of ​​the front section VA, the rivet pin shaft section 16 has a convex fixing area 26, which tapers conically towards the front end 28.

[0029] In the transition area marked with ü between the central section MA and the front section VA, a step in the form of a radial taper 30 is formed spaced from the front end 28.

[0030] As can be clearly seen in the figures, a clamping element 32 is provided for the pre-assembly of the rivet pin 10, which is located in Fig. Figure 8 shows the clamping element 32 as a single component in an isometric view. The clamping element 32 has a clamping element through-opening 34. The diameter d of the clamping element through-opening 34 is matched to the diameter of the rivet pin shank section 16 in the clamping section KA such that the clamping element 32 can be clamped onto the rivet body shank section 16 by simply pushing it onto the shank section 16. For this purpose, the diameter d is chosen to be slightly smaller than the diameter of the rivet pin shank section 16 in the clamping section KA. Furthermore, four clamping tabs 36, 38 are provided on the clamping element 32, which surround the clamping element through-opening 34 on the outside by means of arc-shaped sections. In the embodiment shown, the clamping tabs are formed by two C-shaped recesses 40, which are arranged symmetrically to each other with respect to the clamping tabs 36.

[0031] By inserting the rivet pin shaft section 16 into an opening of the first element 12, as shown in Fig. 1 shown, and subsequent placement of the clamping element 32 onto the rivet body shaft section 16, can be achieved by inserting the clamping element 32 onto the rivet body shaft section 16 into the Fig. 2 and Fig. 3. A recognizable arrangement for the pre-assembly of a riveting system according to the invention is produced. The rivet pin 10 is fixed against the rivet pin shank section 16 by means of a force-fit connection, whereby the rivet pin 10 is positioned in the Fig. 2 and Fig. The relative position shown in 3 with respect to the first element 12 can be fixed.

[0032] In the event of disassembly, a lever tool is applied to the undercut 22 and the frictional connection between the clamping element 32 and the rivet pin 10 is released by levering the rivet pin head section 14 upwards using the lever tool (not shown). As soon as the clamping element 32 leaves the clamping section KA towards the central section MA, it slides down along the rivet pin shank section 16 to the radial taper 30. The radial taper 30 serves as a retaining device for the clamping element 32. Accordingly, if the first element 12 needs to be disassembled, it can be moved into a position by releasing the clamping element 32, in which it is still frictionally attached to the rivet pin shank section 16 by hanging in the transition section marked ü between the central section MA and the front section VA.The clamping element 32 can be disassembled if necessary by pulling the clamping element 32 off the shaft section 16 against the clamping force.

[0033] In the Fig. 4 to Fig. Figure 5 shows the pre-assembly of a rivet body 50 on a second element 52. The rivet body 50 has a rivet head section 54 and a rivet shank section 56. The basic structure of the rivet body 50 is thus similar to the basic structure of the rivet pin 10. However, the rivet body 50 has a rivet body through-opening 58, which extends through both the rivet head section 54 and the rivet shank section 56. For pre-assembly, the rivet shank section 56 is guided through a through-opening 80 of the second element 52 until the rivet head section 54 rests with its underside 60 against the second element 52. As shown in Figure 5, the rivet head section 54 is inserted into the rivet body. Fig. As can be clearly seen in section 5, the rivet body shaft section 56 has four movable fixing elements 62, which in the embodiment shown are designed as detent elements and each have a locking contour 64.

[0034] The movable fixing elements 62 are legs extending longitudinally along the rivet body shank section 56, each extending over a partial arc segment of the rivet body shank section 56. In the illustrated embodiment, a total of four fixing elements 62 are provided, each extending approximately over a quarter arc in the circumferential direction of the rivet body shank section 56 and having an annular segment shape.

[0035] As in the Fig. 5, Fig. 6 and Fig. As can be clearly seen in Figure 9, the rivet body shank section 56 also has a convexly shaped front section 66, which is formed by the four fixing elements 62. The front section 66 tapers conically towards the front end 68 and has a radial taper as a locking contour 64. The radial taper of the front section 66 is formed as a slope that is inclined radially outwards and towards the front end 68. This allows the rivet body 50 to be removed by either pulling it out at the rivet body head section 54 or by pressing it from the front end 68 towards the rivet body head section 54.

[0036] For the pre-assembly of the rivet body 50, as described in the Fig. 4 and Fig. As shown in Figure 5, a further clamping element 70 is provided. The clamping element 70 is preferably structurally identical to the one shown in Figure 5. Fig. 8 clamping element 32 shown, wherein the diameter is matched to the outer diameter of the rivet body shaft section 56.

[0037] As soon as the rivet body is 50 as in the Fig. 4 and Fig. 5. The part shown is pre-assembled; final assembly can be prepared by following the steps outlined in the diagram. Fig. 4 and Fig. The arrangement shown in Figure 5, with the rivet body shank section 56, is inserted into a through-opening of a base body 72. The partial length TL of the rivet body shank section 56 is chosen to be such that the locking contour 64 reaches at least to an inner wall 74 of the base body 72 when the rivet body shank section 56, in the arrangement with the second element 52 and the clamping element 70, penetrates the through-opening formed in the base body 72. This results in the rivet body 50 being force-fitted into the base body 72.

[0038] In a final assembly step, the part in the Fig. 1 to Fig. 3 Arrangement shown with the rivet pin 10 pre-mounted on the first element 12 inserted from the side with the rivet body head section 54 into the rivet body through-opening 58 of the rivet body 50 to achieve the Fig. The final assembly arrangement shown in the half-section of Figure 10 is to be reached. In this arrangement, the convex fixing area 26 is located within the through-opening 58 in the longitudinal direction at the level of the front end 68 of the rivet body shank section 56. This restricts the movement of the fixing elements 62 to such an extent that elastic deflection of the fixing elements 62 in a radial inward direction, as would be necessary to pull the rivet body 50 out of the through-opening of the base body 72, is not possible. The movement of the fixing elements 62 is thus restricted to such an extent that the first element 12 and the second element 52 are securely fastened to the base body 72 by means of the two-part rivet, formed from the rivet pin 10 and the rivet body 50.

[0039] Fig. Figure 11 shows the function of the radial taper 30 as a locking device for the clamping element 32 when the Fig. 2 and Fig. The arrangement shown in Figure 3 is partially disassembled using a lever tool. In this embodiment, it is also clearly evident that the through-opening 76 formed in the first element 12 is significantly larger than the diameter of the clamping pin shaft section in the clamping section KA. This is also evident in Fig. 10 clearly visible. This makes the through-hole 76 very suitable as a tolerance compensation, especially when a large number of such through-holes have to align with other through-holes.

[0040] In the Fig. 12 to Fig. Figure 14 shows a specific application example for a riveting system according to the invention. Fig. Figure 12 shows a section of a battery system 80, which has a subsection 82 with two high-voltage connectors 84. In the embodiment shown, the high-voltage connectors 84 are arranged parallel to each other. In the embodiment shown, the subsection 82 separates two battery modules (not shown) from each other. Fig. 13 are first pre-assembled with rivet bodies 50 as described above, forming second elements 52 opposite the base body 72, which adjoins these elements and extends below the second elements 52. As shown Fig. As can be seen in Figure 13, the second elements extend essentially over the top of the high-voltage connectors 84, with the second elements 52 also extending downwards in the vertical direction. The second elements 52 are fire protection components 86, which also provide a separation between the battery modules (not shown) below and above.

[0041] In a further assembly step, the Fig. The final assembly shown in section 14 is achieved. This involves a process similar to that described in the [document / section]. Fig. 1 to Fig. The arrangement shown in Figure 3 with rivet pins 10 is inserted into the through-openings of the rivet bodies 50 together with a first element 12. The first element 12 covers both high-voltage connectors 84 and all areas between them and extending longitudinally along the high-voltage connectors 84 from the top. The first element 12 is also a fire protection component 88. In summary, with the rivet system and the method according to the invention, two elements 12, 52 can be mounted successively in arbitrarily timed work steps on the same through-opening of a base body 72.

[0042] When clamping elements 32, 70 are used, as in the Fig. 2, Fig. 3, Fig. 5, Fig. 6 and Fig. 8 to Fig.As shown in Figure 11, assembly can be automated using appropriate machines. Furthermore, the pre-assembly of the rivet pin 10 on the first element 12 and the rivet body 50 on the second element 52 can be automated or manual. Connecting the first element 12 and the second element 52 requires only a through-hole in the base body 72 and in the respective elements 12 and 52.

[0043] The features of the invention disclosed in the present description, the drawings, and the claims can be essential for realizing the invention in its various embodiments, both individually and in any combination. The invention can be varied within the scope of the claims and taking into account the knowledge of the person skilled in the art. Reference symbol list 10 rivet pins 12 first element 14 Rivet head section 16 Rivet pin shaft section 18 Top 20 Subpage 22 Undercut 24th rib 26 heads 28 front end 30 Rejuvenation 32 clamping element 34 Clamping element through-hole 36 clamping tab 38 clamping tab 40 C-shaped recess 50 rivet bodies 52 second element 54 Rivet body head section 56 Rivet body shank section 58 Rivet body through-hole 60 bottom 62 Fixing element 64 Locking contour 66 Anterior section 68 front end 70 clamping element 72 Basic shapes 74 Interior wall 76 Through opening (in the first element) 78 Passage opening 80 battery system 82 Sub-area 84 high-voltage connectors 86 Fire protection component 88 Fire protection component 90 Through opening (in the second element) IS Length of the rivet pin shank section MA Middle Section KA clamping section VA front section Transition area d diameter of the clamping element QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 1353079 A1

[0006]

Claims

[1] Multi-part riveting system comprising at least one rivet body (50) and a rivet pin (10) designed to interact with the rivet body (50), wherein the rivet body (50) comprises a rivet body head section (54) and a rivet body shank section (56), wherein the rivet pin (10) comprises a rivet pin head section (14) and a rivet pin shank section (16), and wherein the rivet body (50) further comprises a rivet body through-hole (58) for inserting the rivet pin shank section (16), characterized by, that the rivet body shaft section (56) has at least one movable fixing element (62) and the rivet pin shaft section (16) has an expanding section provided for interaction with the fixing element (62), wherein the expanding section is designed in such a way that it can be positioned in the rivet body through-opening (58) in the intended final assembly position as a locking element in such a way that the movement of the rivet body (50) is restricted or completely prevented. [2] Rivet system according to the preceding claim, characterized by , that the front end section (VA) of the rivet body shaft section (56) and / or the rivet pin shaft section (16) is conically tapered towards the front end (28, 68) and a radial taper (30) is formed spaced apart from the front end (28, 68). [3] Rivet system according to one of the preceding claims, characterized by, that furthermore at least one clamping element (32, 70) is provided with a clamping element through-opening (34) which is adapted to the rivet body shaft section (56) and / or to the rivet pin shaft section (16) in such a way that the clamping element (32, 70) can be clamped onto the rivet body shaft section (56) or onto the rivet pin shaft section (16) by placing it on the rivet body shaft section (56) or onto the rivet pin shaft section (16). [4] Rivet system according to the preceding claim, characterized by , that both a rivet body clamping element (70) and a rivet pin clamping element (32) are provided. [5] Rivet system according to one of the two preceding claims, characterized by , that the clamping element (32) has at least two clamping tabs (36, 38) which each extend over a part of the outer circumference of the clamping element through-opening (34). [6] Rivet system according to the preceding claim, characterized by, that the clamping tabs (36, 38) are formed by two c-shaped or x-shaped recesses (40) which extend partially through the through-openings (34). [7] Rivet system according to any of the preceding claims, characterized by , that at least one disassembly contour for gripping a disassembly tool is formed on the rivet head section (14). [8] Method for fastening a first element (12) and a second element (52) to a base body (72) using a rivet system according to any one of claims 1 to 7, wherein first the rivet pin (10) with its rivet pin shank section (16) is inserted into a through-opening (34) of the first element (12) and the rivet body (50) with its rivet body shank section (56) is inserted into a through-opening (58) of the second element (50) and into a through-opening (78) of the base body (72) and wherein subsequently, by inserting the rivet body shank section (56) into the rivet body through-opening (58), the spreading section of the rivet pin shank section (16) is brought into such a relative position to the rivet body (50) that the mobility of the rivet body (50) is restricted or completely prevented. [9] Method according to the foregoing claim, characterized by, that the through-opening (34) of the first element (12) is significantly larger than the maximum radial extent of the rivet pin shaft section (16) and a rivet pin clamping element (32) is used to pre-fix the rivet pin (10) relative to the first element (12) by clamping the rivet pin clamping element (32) to the rivet pin shaft section (16). [10] Method according to one of the two preceding claims, characterized by, that first the rivet pin (10) is pre-assembled relative to a first element (12) and the rivet body shank section (56) is inserted into corresponding through-openings (76, 90) of the second element (52) and the base body (72) for pre-assembly of the second element (52) relative to the base body (72), in order to subsequently effect a force-fit fixation of the rivet pin (10) in the rivet body (50) and a form-fit fixation of the first element (12) and the second element (52) relative to the base body (72) by inserting the rivet pin (10) with its rivet pin shank section (16) into the rivet body through-opening (58).

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