Fastening device, screw connection, motor vehicle and method for connecting components

Abstract

Fastening device (1) for connecting components (30, 40), comprising a threaded bolt (10) with a longitudinal central axis (A), which forms a head section (11) and a threaded section (12) with an external thread (13), characterized in that the head section (11) has one or more through-openings (15) which extend parallel to the longitudinal central axis (A), wherein the one or more through-openings (15) open on a head underside (17) of the head section (11) facing in the direction of the threaded section (12) into an annular region (18) of the head underside (17), the inner diameter of which is larger than the outer diameter of the threaded section (12) and the outer contour of which is delimited by the outer contour of the head section (11).

Description

[0001] The invention relates to a fastening device for connecting components, comprising a threaded bolt with a longitudinal central axis, which forms a head portion and a threaded portion.

[0002] Furthermore, the invention relates to a screw connection with such a fastening device.

[0003] Furthermore, the invention relates to a motor vehicle comprising a vehicle body, a subframe which is fastened to the vehicle body, and a threaded bolt by means of which the subframe is clamped to the vehicle body, wherein the threaded bolt has a longitudinal central axis and forms a head portion and a threaded portion, and wherein the subframe has a through-opening through which the threaded bolt extends, such that a gap is formed between the threaded bolt and an inner wall of the through-opening of the subframe.

[0004] Finally, the invention relates to a method for connecting components by means of a fastening device of the type mentioned at the outset.

[0005] DE 103 11 841 A1 discloses a screw connection comprising two components to be connected to one another and a threaded bolt. In this connection, the components to be connected are clamped together by the threaded bolt, and an annular space is formed radially around the threaded bolt between the threaded bolt and the components to be connected, which annular space is filled with a hardened medium. This creates a frictional connection and a positive connection at the same time. The medium is filled through a central channel in the threaded bolt, which is connected to the annular space via transverse bores. However, this significantly weakens the stress cross-section of the threaded bolt, necessitating the use of relatively thick threaded bolts. This can, however, lead to installation space problems. Alternatively, DE 103 11 841 A1 proposes filling via a washer, which has a channel system leading to the intermediate space.However, the production of such a washer is very complex due to the formation of the channel system required for filling.

[0006] GB 979 573 A describes lattice structures, i.e. beams, cantilevers or columns consisting of elongated members, such as battens, angles, I-beams or channel sections, which are connected only at their ends or both at their ends and at one or more intermediate points along their length and are arranged in such a way that the stresses in the individual members are essentially longitudinal, i.e. the members or their webs between the attachment points act primarily as anchors, bracing or redundancy. A bolt is used to fasten two galvanized metal parts in conjunction with a galvanized nut and washers.The required passage to fill the gaps is created by drilling a hole through the screw head parallel to the screw axis and at a distance from that axis such that the axis of the hole coincides with the surface of the screw shank. The hole thus formed opens partially into the underside of the screw head to form a semicircular opening, and partially into the screw shank. The end of the passage opening on the top of the screw head is tapered to form a funnel-shaped opening into which resin is injected through a nozzle.

[0007] US 4,990,041 A discloses a fastening device for securing a longitudinally extending body member in an opening of a workpiece. The fastening device is designed to receive elastic material after it has been inserted into the workpiece. In one embodiment, the inserted elastic material cooperates with the longitudinally extending body member to lock the device in place and provide a support structure to the workpiece. In an alternative embodiment, the body member assumes the shape of the workpiece opening after injection of the elastic material.

[0008] The object of the present invention is to remedy this situation and, in particular, to demonstrate an alternative fastening concept for a comparable fastening situation involving combined force and form closure.

[0009] This object is initially achieved in general by a fastening device for connecting components according to patent claim 1. The fastening device according to the invention comprises a threaded bolt with a longitudinal central axis, which forms a head section and a threaded section with an external thread and is characterized in that the head section has one or more through openings which extend parallel to the longitudinal central axis, wherein the one or more through openings open on a head underside of the head section facing in the direction of the threaded section in a ring-like region of the same, the inner diameter of which is larger than the outer diameter of the threaded section and the outer contour of which is delimited by the outer contour of the head section.

[0010] A hardenable medium can be injected through the through holes in the head section as part of a bolted connection, enabling a positive connection in parallel with the frictional connection. This can be used in automotive construction, for example, to connect a subframe to the vehicle body, providing very stable support for the subframe against the vehicle body.

[0011] However, such a fastening device can generally be used in plant, machine and steel construction.

[0012] The solution according to the invention also enables improved corrosion protection, as the threaded bolt and the components to be connected are protected by the hardenable medium in the area of ​​their screw connection. This makes the fastening device according to the invention particularly suitable for offshore applications, for example, for wind turbines, drilling and production platforms, and ships.

[0013] The arrangement of the through-hole in the head section of the threaded bolt makes it very easy to fill the curable medium. In particular, the filling of the curable medium can be automated. For example, when attaching a subframe to a vehicle body during vehicle assembly, a corresponding filling device can be fed vertically from below, facing the vehicle's transport direction.

[0014] Furthermore, one or more through-holes in the head section allow for reliable location. They also provide small outlets for the curable medium at the filling device, thus minimizing unwanted premature curing of the medium.

[0015] In addition, the stress cross-section of the threaded bolt is not weakened by the channel system required for filling, so that, for example, the same bolt dimensions can be used in an existing structure. If necessary, but not necessarily, this is also possible without an additional washer. If a washer is used, it can be manufactured more easily.

[0016] Particular embodiments of the fastening device according to the invention are the subject of further patent claims.

[0017] For example, several through-holes on the top of the head section, facing away from the bottom of the head, can be connected by an annular groove. This makes the filling process more reliable and / or faster, since regardless of the rotational position of the threaded bolt relative to the filling device, the application of medium through at least one of the through-holes is always possible when the device is attached to the head section.

[0018] According to another particular embodiment of the invention, the fastening device further comprises a washer, which forms corresponding recesses in the region of the through-openings. These recesses can, for example, be in the form of holes or slots on the washer. Furthermore, it is possible to provide them in the form of notches on the otherwise circular inner edge of the washer. Such a washer can enlarge the support base of the head section on the underlying component in order to provide a sufficient annular space around the threaded bolt for filling with the hardenable medium.

[0019] Alternatively or additionally, the head section can be radially expanded at the level of the head underside by means of a molded-on flange. This also facilitates a relatively large area for the openings of the through holes on the underside of the head.

[0020] The fastening device can also be assigned a curable medium, which is designed to be applied through one or more through-holes in the head. This requires a viscosity that is tailored to the cross-section of the through-holes.

[0021] The above-mentioned object is further achieved by a screw connection according to patent claim 6. This comprises two components to be connected to one another and a fastening device of the aforementioned type, wherein the components to be connected are clamped together by the threaded bolt and an annular space is formed between the threaded bolt and the components to be connected below the head section radially around the threaded bolt, which annular space is filled with the hardened medium. This creates not only a frictional connection between the components to be connected to one another, but simultaneously also a positive connection. If a transverse load on the screw connection leads to a drop in the frictional connection or to an overload, the positive connection via the hardenable medium prevents the components from shifting against one another in a plane perpendicular to the longitudinal center axis of the threaded bolt.

[0022] According to a special design of the screw connection, a venting channel is preferably formed on at least one of the components to be connected, connecting the annular space to the outside environment. This ensures particularly reliable filling of the annular space with the hardenable medium. Furthermore, the leakage of medium from the venting channel can be used to visually check whether proper filling has occurred.

[0023] The above-mentioned object is further achieved by a motor vehicle according to patent claim 8. This comprises a vehicle body, a subframe which is fastened to the vehicle body, and a threaded bolt by means of which the subframe is braced to the vehicle body, wherein the threaded bolt has a longitudinal central axis and forms a head section and a threaded section with an external thread, and wherein the subframe has a through-opening through which the threaded bolt extends, such that a gap is formed between the threaded bolt and an inner wall of the through-opening of the subframe.It is characterized in that the head section of the threaded bolt has one or more through-openings which extend parallel to the longitudinal central axis, wherein the one or more through-openings open into an annular region on a head underside of the head section facing in the direction of the threaded section, the inner diameter of which is larger than the outer diameter of the threaded section and the outer contour of which is delimited by the outer contour of the head section, and in that said intermediate space is filled with a hardened medium which, in the unhardened state, can be poured into the intermediate space via the at least one through-opening of the head section. This achieves a stable connection of the subframe to the vehicle body, which can also withstand high shear forces.

[0024] In a particular embodiment of the motor vehicle, at least one threaded bolt is arranged at a support point of the subframe located at the rear in the direction of travel in order to further strengthen a load plane provided via the subframe to absorb longitudinal forces, in particular accident forces in the direction of travel, and thereby improve crash safety.

[0025] The above-mentioned object is finally achieved by a method according to patent claim 10 for connecting components by means of a fastening device of the type explained above. In the method according to the invention, in a first step, the components to be connected are clamped against one another by means of the threaded bolt, whereby an annular space remains between the components and the threaded bolt below the head of the threaded bolt. In a further, subsequent step, after clamping, a hardenable medium is introduced through the through-openings of the head section into the intermediate space or annular space in order to fill it, and is hardened there. This makes it possible to achieve a fastening in a simple manner which simultaneously enables a force-fit and a form-fit connection. The method according to the invention is easy to automate and is also well suited for series production in vehicle construction.

[0026] The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawing. The drawing shows: Fig. 1 an embodiment of a fastening device according to the invention in a view from above, Fig. 2 a longitudinal sectional view through the fastening device according to Fig. 1, Fig. 3 an embodiment of a first embodiment variant of a washer of the fastening device, Fig. 4 an embodiment of a second embodiment of a washer of the fastening device, Fig. 5 an embodiment of a screw connection according to the invention in longitudinal section, and in Fig. 6 a further embodiment of a screw connection according to the invention in longitudinal section.

[0027] The embodiment in the Fig. 1 and Fig. Figure 2 shows a fastening device 1 for connecting components. This fastening device 1 comprises a threaded bolt 10 with a longitudinal central axis A, which forms a head portion 11 and a threaded portion 12 with an external thread 13. The head portion 11 can be directly connected to the threaded portion 12. However, it is also possible to additionally provide a shaft portion 14 without a thread between the head portion 11 and the threaded portion 12.

[0028] The head section 11 has one or more through openings 15, each of which extends parallel to the longitudinal central axis A and connects a head top side 16 and a head bottom side 17.

[0029] The one or more through openings 15 open into a ring-like region 18 of the head underside 17 of the head section 11 pointing in the direction of the threaded section 12.

[0030] The inner diameter of said ring-like region 18 is larger than the outer diameter of the threaded portion 12. In addition, the outer contour of the ring-like region 18 is limited by the outer contour of the head portion 11.

[0031] If necessary, as shown in the present embodiment, the head section 11 can be radially widened at the level of the head underside 17 by a molded-on flange 11a in order to enlarge the contact surface on the head section 11 of the threaded bolt 10.

[0032] How Fig. 1 and Fig. 2, the one or more through-openings 15 on the top side 16 of the head facing away from the bottom side 17 can be connected by an annular groove 19. This annular groove 19 serves to distribute a medium applied via the through-openings 15, as will be explained in more detail below.

[0033] Preferably, the annular groove 19 runs concentrically around the longitudinal center axis A. The through openings 15 have corresponding openings into the annular groove 19.

[0034] The corresponding openings on the underside of the head 17 can open into a groove which is formed between the head section 11 and the shaft section 14, possibly also the threaded section 12.

[0035] When viewed in the Fig. 1, the through holes 15 extend radially outside the stress cross-section of the threaded section 12, so that the stress cross-section remains unaffected.

[0036] The head section 11 can have an external hexagon shape as shown. However, other head shapes are also possible. For example, Fig. 6, which shows a hexagon socket for the head section 11 as a further possible embodiment. The through openings 15 and any annular groove 19 present are located in this case at the bottom of the hexagon socket recessed into the head section 11.

[0037] The fastening device 10 explained above can optionally be assigned a curable medium 50 whose viscosity is such that it can be applied through the one or more through openings 15 in the head section 11.

[0038] The curable medium is preferably a curable plastic-based mass, for example an epoxy resin in the form of a two-component system.

[0039] The Fig. 3 and Fig. 4 show, by way of example, further optional components of the fastening device, namely various design variants of washers 20, which are matched to the through openings 15 in the head section 11.

[0040] In contrast to a conventional washer with a circular inner edge, these washers 20 form corresponding recesses 21 in the area of ​​the through-openings 15. When installed, these recesses 21 lie beneath the through-openings 15, such that medium applied through the through-openings 15 passes past or through the washer 20. The section of a filling channel for the curable medium 50 formed by the recesses 21 thus runs parallel to the longitudinal center axis A of the threaded bolt 10, whereby the recesses 21 can be manufactured considerably more easily, in contrast to the radial channel sections in DE 103 11 841 A1. The curable medium 50 is not deflected during filling, but can flow practically parallel to the longitudinal center axis A, whereby the flow resistance during filling remains low.

[0041] At the Fig. In the first embodiment shown in Figure 3, the aforementioned recesses 21 are designed in the form of slots 22, which can be created, for example, by punching. Instead of slots 22, holes are also possible, which can also be drilled, for example.

[0042] Fig. 4 shows, in a second embodiment, recesses 21 in the form of notches 23 on the otherwise circular inner edge 24 of the washer 20.

[0043] If the washer 20 is omitted, corresponding recesses 21 of the type described above can also be formed directly on the component below the head section 11. This can be done simultaneously with the provision of the relevant through-hole for the threaded bolt 10, so that no additional manufacturing effort is required.

[0044] Even when using a washer 20 of the type mentioned above, corresponding recesses 21 can be provided on the component on which the head section 11 is supported via the washer 20, if necessary, in order to avoid a deflection of the hardenable medium 50 during filling. This makes it possible to realize a filling channel preferably exclusively parallel to the longitudinal axis A. Furthermore, a large support surface for the head section 11 and / or the washer 20 can be provided at the same time in order to achieve a high preload on the threaded bolt 10.

[0045] Using the components described above, a screw connection can be made as shown in the Fig. 5 and Fig. 6 by way of example, although it should be emphasized again that the inclusion of the washer 20 as shown is purely optional and can optionally also be realized, for example, by a larger diameter of the head section 11 of the threaded bolt 10 or by a flange 11a formed on the remaining head section.

[0046] The screw assembly comprises at least two components 30 and 40 to be connected to one another; if necessary, their number can also be greater, as well as a fastening device 1 of the type described above with a threaded bolt 10 and a curable medium 50 in the cured state. Furthermore, as already mentioned, a washer 20 is optionally provided, via which the head portion 11 of the threaded bolt 10 is supported on one of the components 30 and 40. As explained in more detail below, one of the components 30 can be a vehicle body and the other component 40 can be a subframe.

[0047] The two components 30 and 40 to be connected are clamped together by the threaded bolt 10. For this purpose, the threaded bolt 10 can be screwed with its threaded section 12 into a thread on one of the components. Fig. 5 and Fig. However, in the embodiments shown in Figure 6, fastening is effected by means of a nut 60 of conventional design.

[0048] Between the threaded bolt 10 and the components 30 and 40 to be connected, a space, in particular an annular space 2, is formed radially around the threaded bolt 10 below the head section 11. This space is filled with the hardened medium 50. This not only creates a frictional connection, but also a positive connection between the components 30 and 40 and the threaded bolt 10. In the event of a shear load on the screw connection, which would overcome the prestress due to the frictional connection, the hardened medium 50 prevents the components 30 and 40 from shifting relative to each other via the threaded bolt 10 transversely to the longitudinal center axis A of the threaded bolt 10.

[0049] After the components 30 and 40 have been clamped against one another by means of the threaded bolt 10, the curable medium 50 is introduced into the intermediate space or annular space 2 via the at least one through-opening 15, where it subsequently cures in order to provide the form fit.

[0050] To facilitate the introduction of the curable medium into the intermediate space or annular space 2, at least one venting channel 41 can be formed on at least one of the components 30 and 40 to be connected, which venting channel connects the intermediate space or annular space 2 with the external environment 3.

[0051] As already mentioned, the bolted connection explained above can be used on a motor vehicle to attach a subframe - in the Fig. 5 and Fig. 6 Component 40 - on a vehicle body - in the Fig. 5 and Fig. 6 Component 30 - to be fastened.

[0052] For this purpose, the subframe or component 40 has a through-opening 42 through which the threaded bolt 10 already explained above extends. The above-mentioned intermediate space 2 is formed between the threaded bolt 10 and the inner wall 43 of the through-opening 42 of the subframe 40. This intermediate space 2 is axially delimited in one direction by the head section 11 and the washer 20, which may be incorporated between the head section 11 and the component 30, and in the other direction by the other component 40 and, if applicable, the nut 60.

[0053] After the threaded bolt 10 has been tightened with the components 30 and 40, the one or more through openings 15, which extend radially outside the threaded section 12 parallel to the longitudinal center axis A, are connected to the intermediate space 2.

[0054] This intermediate space 2 is then filled with the curable medium 50 until it is completely filled. Proper filling of the intermediate space 2 can be visually verified by detecting the medium 50 escaping through the at least one vent opening 41.

[0055] In other words, the fastening device 10 according to the invention is attached in such a way that, in a first step, the components 30 and 40 to be connected are clamped against one another by means of the threaded bolt 10, whereby an intermediate space or annular space 2 remains between the components 30 and 40 and the threaded bolt 10 below the head section 11 of the threaded bolt 10. In a further step after clamping, the curable medium 50 is then introduced through the at least one through-opening 15 of the head section 11 into the intermediate space or annular space 2 in order to fill it, and is cured there.

[0056] At the Fig. In the embodiment shown in Figure 5, the head portion 11 of the threaded bolt 10 has an external engagement for centering a filling device 70. For this purpose, the head portion 11 is provided, for example, with an external hexagon 11b. However, other external contact surfaces for attaching a corresponding counter contour 71 of the filling device 70 can also be provided there.

[0057] In Fig. 5, the centering of the counter contour 71 can be done via the corner dimension of the head section 11 (in Fig. 5 by a dash-dot line). Alternatively, attachment can be made via contact or key surfaces formed on the head section 11, as shown in Fig. 5 is indicated by a dashed line for the counter contour 71.

[0058] A filling channel 72 on the filling device 70 is arranged such that it meets the annular groove 19 when the filling device 70 is placed on the head section 11, so that hardenable medium 50 can always reach at least one of the through openings 15 regardless of the relative rotational position between the filling device 70 and the threaded bolt 10. As shown in the Fig. 5 and Fig. 6, an end face 73 of the filling device 70 seals against the head section 11.

[0059] When the filling device 70 is attached, the annular groove 19 becomes a closed channel. This ensures a reliable flow of hardenable medium 50 even with only a point-like opening. An annular groove corresponding to the annular groove 19 can optionally be provided on the filling device 70 side.

[0060] If necessary, a fixing device 74 can be provided on the filling apparatus 70 to fix the filling apparatus 70 to the head section 11, which fixing device 74 can be fixed in the position intended for filling, as shown in the Fig. 5 and Fig. 6, engages in a groove or recess 11c on the head section 11 transversely to the longitudinal central axis A of the threaded bolt 10.

[0061] Fig. 6 alternatively shows a head section 11 with internal engagement via a hexagon socket 11d. Here too, the centering of the filling device 70 can be achieved via the corner dimension (in Fig. 6 dashed line for the counter contour 71) or via key surfaces (dash-dot line in Fig. 6). The filling channel 72, the sealing over the front side 73 and the fixing device 74 can be analogous to Fig. 5 be trained.

[0062] In both cases, it is possible to attach the filling device 70 to the threaded bolt 10 and to remove it again by moving it in the direction of the longitudinal center axis A.

[0063] In the case of fastening a subframe 40 to a vehicle body 30, at least one threaded bolt 10 is preferably arranged at a support point of the subframe 40 located at the rear in the direction of travel. This makes it possible to provide a third load plane via the subframe 40 for absorbing longitudinal forces, in particular accident forces in the direction of travel, since the fastening device 1 explained above can achieve a particularly stable connection of the subframe 40 to the vehicle body 30.

[0064] In order to provide the best possible protection for vehicle occupants in the event of a head-on collision, the front of the vehicle body is designed in such a way that, through targeted deformation of the vehicle body, part of the kinetic energy is converted into deformation energy. A distinction is made between various horizontal planes in the front of the vehicle. The main load plane is that of the two front longitudinal members and, in terms of time, is the oldest mass-produced and so-called first load plane. Later, the upper or second load plane in the upper area of ​​the front fenders followed. In current vehicles, a lower or third load plane is also used, which can, for example, run via the subframe 40 of the front axle into the underbody of the vehicle body. This lower or third load plane can be upgraded using the invention described above to meet higher crash safety requirements with little effort.The screw connection according to the invention can replace a conventional screw connection without changing the dimensions, in particular without the use of larger threaded bolts. Instead, the conventional threaded bolt need only be replaced with a threaded bolt 10 according to the invention and the existing gap or annular space 2 needs to be filled.

[0065] The filling concept explained above enables the filling of the formed intermediate space or annular space 2 while the vehicle is assembled. The filling process is particularly suitable for automation. It allows for a feed from below perpendicular to the transport direction of the vehicle during assembly, ensures reliable location of the at least one through-opening 15, and allows for a small outlet opening on the filling device 70 to minimize premature hardening of the medium.

[0066] Otherwise, the physical properties of the connecting elements are retained. The threaded bolt 10 according to the invention can easily replace a conventional threaded bolt.

[0067] In addition, the invention offers an optical control of the required filling level of the medium in the hollow space or annular space 2 to be filled.

[0068] The invention has been explained in more detail above using an exemplary embodiment and further modifications. The exemplary embodiment and the modifications serve to demonstrate the feasibility of the invention. Individual technical features explained above in the context of further individual features can also be implemented independently of these and in combination with other individual features, even if this is not expressly described, as long as this is technically possible. The invention is therefore expressly not limited to the specifically described exemplary embodiments, but encompasses all configurations defined by the patent claims. List of reference symbols 1 Steer-by-wire vehicle steering system 1 fastening device 2 Intermediate space, especially annular space 3 Outdoor environment 10 threaded bolts 11 Head section 11a Flange 11b External hexagon 11c Recess 11d hexagon socket 12 threaded section 13 external threads 14 Shaft section 15 passage opening 16 Top of the head 17 Underside of the head 18 ring-like area 19 Ring groove 20 Washer 21 Recess 22 slot 23 Notch 24 circular inner edge 30 Component, especially vehicle body 40 Component, in particular subframe 41 Ventilation duct 42 passage opening 43 Interior wall 50 Medium 60 mother 70 Filling equipment 71 Counter contour 72 filling channel 73 front side 74 Fixing device A Longitudinal center axis

Claims

[1] Fastening device (1) for connecting components (30, 40), comprising a threaded bolt (10) with a longitudinal central axis (A), which forms a head portion (11) and a threaded portion (12) with an external thread (13), characterized by in that the head section (11) has one or more through-openings (15) which extend parallel to the longitudinal central axis (A), wherein the one or more through-openings (15) open on a head underside (17) of the head section (11) pointing in the direction of the threaded section (12) in an annular region (18) of the head underside (17), the inner diameter of which is larger than the outer diameter of the threaded section (12) and the outer contour of which is delimited by the outer contour of the head section (11). [2] Fastening device (1) according to claim 1, characterized bythat a plurality of through openings (15) are provided, which are connected by an annular groove (19) on the top side (16) of the head facing away from the bottom side (17). [3] Fastening device (1) according to claim 1 or 2, characterized by that it comprises a washer (20) which forms corresponding recesses (21) in the region of the through openings (15), in particular in the form of holes, slots (22) or notches (23) on the otherwise circular inner edge (24) of the washer (20). [4] Fastening device (1) according to one of claims 1 to 3, characterized by that the head section (11) is radially expanded at the level of the head underside (17) by a molded-on flange (11a). [5] Fastening device (1) according to one of claims 1 to 4, characterized by that it comprises a curable medium (50) which can be applied through the one or more through openings (15) in the head section (11). [6] Screw assembly, comprising two components (30, 40) to be connected to one another and a fastening device (1) according to one of the preceding claims, wherein the components (30, 40) to be connected to one another are clamped together by the threaded bolt (10) and an annular space (2) is formed between the threaded bolt (10) and the components (30, 40) to be connected below the head section (11) radially around the threaded bolt (10), which annular space (2) is filled with a hardened medium (50). [7] Screw assembly according to claim 6, characterized by that a ventilation channel (41) is formed on at least one of the components (30, 40) to be connected, which connects the annular space (2) with the outside environment (3). [8] Motor vehicle, comprising a vehicle body, a subframe attached to the vehicle body, a threaded bolt (10) by which the subframe is clamped to the vehicle body, wherein the threaded bolt (10) has a longitudinal central axis (A) and forms a head portion (11) and a threaded portion (12) with an external thread (13), and wherein the subframe has a through-opening (42) through which the threaded bolt (10) extends, such that an intermediate space (2) is formed between the threaded bolt (10) and an inner wall (43) of the through-opening of the subframe, characterized bythat the head section (11) of the threaded bolt (10) has one or more through-openings (15) which extend parallel to the longitudinal central axis (A), wherein the one or more through-openings (15) open on a head underside (17) of the head section (11) pointing in the direction of the threaded section (A) in an annular region (18) thereof, the inner diameter of which is larger than the outer diameter of the threaded section (12) and the outer contour of which is delimited by the outer contour of the head section (11), and that said intermediate space (2) is filled with a cured medium (50) which, in the non-cured state, can be filled into the intermediate space (2) via the at least one through-opening (15) of the head section (11). [9] Motor vehicle according to claim 8, characterized bythat at least one threaded bolt (10) is arranged at a support point of the subframe located at the rear in the direction of travel, wherein a load plane for absorbing forces resulting from a longitudinal impact is provided via the subframe. [10] Method for connecting components (30, 40) by means of a fastening device (1) according to one of claims 1 to 5, characterized by that in a first step the components to be connected (30, 40) are clamped against one another by means of the threaded bolt (10), an annular space (2) remaining between the components (30, 40) and the threaded bolt (10) below the head section (11) of the threaded bolt (10), and that in a further step after clamping a hardenable medium (50) is introduced through the one or more through openings (15) of the head section (11) into the annular space (2) in order to fill it, and is hardened there.

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