Two-piece expansion threaded bolt and component with the two-piece expansion threaded bolt

Abstract

A two-part expansion threaded bolt (1) for installation in a receiving bore of a component (3), comprising: a) a threaded bolt (10) with a first axial end (12) and an opposing second axial end (14) which has: a1) at the first axial end (12) a cylindrical head region (20) which radially outside a first anchoring structure (22) and a first outer diameter D B1 exhibits a2) at the second axial end (14) a fastening area (40) which is at least partially provided with an external thread (42) and in the area of ​​the external thread (42) has a second outer diameter D B2 exhibits a diameter smaller than the first outer diameter D B1 , and a3) a, preferably cylindrical, positioning area (30) between the head area (20) and the mounting area (40), which is separated from the head area (20) and the mounting area (40) by a step (26, 32) and has a third outer diameter D B3 exhibits a diameter smaller than the first outer diameter D B1 and larger than the second outer diameter D B2 is, as well as b) an anchoring sleeve (50; 150; 250; 350; 450; 550; 650; 750), preferably cylindrical, which has a second anchoring structure (56) radially outside and an inner diameter d radially inside H exhibits for which the following applies: d H ≤ D B3 , so that c) the anchoring sleeve (50; 150; 250; 350; 450; 550; 650; 750) is arranged in a pre-assembled state in a form-fitting manner in the positioning area (30), preferably by means of an interference fit, and d) during a setting process the head area (20) can be moved into the anchoring sleeve (50) by means of a tool, thereby enabling a friction-fit fastening of the two-part expansion threaded bolt (1) in the receiving bore.

Description

1. Field of the invention

[0001] The present invention relates to a two-part expansion threaded bolt for installation in a receiving bore of a first component and to a first component with a receiving bore in which a two-part expansion threaded bolt is fastened. Furthermore, a fastening method for a two-part expansion threaded bolt in a first component with a receiving bore is described. 2. Background of the invention

[0002] Expansion inserts in which a threaded bushing is drawn into an anchoring sleeve are known in the prior art in a variety of designs.

[0003] As described, for example, in EP 0 080 558 A1, the threaded bushing is connected to the anchoring sleeve via a predetermined breaking point. Installation is achieved by inserting the anchoring sleeve into a smooth receiving bore of a workpiece. A threaded mandrel of the installation tool is screwed into the threaded bushing. During the axial pulling motion of the mandrel, the threaded bushing first shears off at the predetermined breaking point and is then drawn into the anchoring sleeve, which expands radially. This expansion presses projections on the outer wall of the anchoring sleeve into the receiving bore. The outer surface of the threaded bushing is also knurled to prevent rotation. The described expansion insert is manufactured as a single-piece component and is a cost-effective solution for threaded connections in light metals as well as thermoplastic and thermosetting plastics.

[0004] Another blind fastening with threads is described in US 3,683,740. This design features an anchor with a sleeve and a base with internal threads, connected by a relatively weak joint. This allows the sleeve and base to be formed as a single unit and separated. An external thread on the base and an internal thread on the sleeve allow the base to be screwed into the sleeve when the connection is broken and the base is screwed into the sleeve. In one embodiment, the base does not have an internal thread but is instead provided with a threaded stud. This provides a one-piece expansion stud, allowing a component to be fitted with a threaded stud instead of a threaded bushing.

[0005] Another expansion threaded bolt is known from DE 197 32 239 A1. The expansion threaded bolt is inserted into an anchoring sleeve by pressing a cylindrical head integrally formed on the bolt. The anchoring sleeve is thereby radially expanded and pressed into a smooth receiving bore of a workpiece made of light metal or plastic. For economic reasons, the anchoring sleeve and the threaded bolt are manufactured separately and then pre-assembled, i.e., attached to each other. This is done by gluing, pressing, clipping, or injection molding the anchoring sleeve onto the head. The anchoring sleeve has a large wall thickness and an inner diameter that corresponds approximately to the outer diameter of the head.

[0006] A disadvantage here is the high manufacturing cost. Cracks or other damage to the anchoring sleeve can also occur, which negatively affects the fastening of the known expansion thread bolt in the component. This can also negatively impact the pull-out force of the expansion thread bolt or lead to damage to the component in the area of ​​the receiving bore.

[0007] The object of the present invention is therefore to provide a two-part expansion threaded bolt that overcomes the disadvantages of the prior art and ensures reliable insertion of the two-part expansion threaded bolt into the receiving bore of the component. Furthermore, it is an object to provide a corresponding first component with the two-part expansion threaded bolt. 3. Summary of the invention

[0008] The above problem is solved by a two-part expansion threaded bolt according to independent claim 1 and a first component with a two-part expansion threaded bolt attached therein according to claim 9. Advantageous embodiments and further developments will become apparent from the following description, the drawings and the pending claims.

[0009] A two-part expansion threaded bolt according to the invention for installation in a receiving bore of a first component comprises a threaded bolt with a first axial end and an opposing second axial end. The threaded bolt has a cylindrical head region at the first axial end, which radially outside comprises a first anchoring structure and a first outer diameter D. B1 has a fastening area at the second axial end, which is at least partially provided with an external thread and has a second outer diameter D in the area of ​​the external thread. B2exhibits a diameter smaller than the first outer diameter D B1 , and a, preferably cylindrical, positioning area between the head area and the mounting area, which is separated from the head and mounting areas by a step and has a third outer diameter D B3 exhibits a diameter smaller than the first outer diameter D B1 and larger than the second outer diameter D B2 Furthermore, the two-part expansion threaded bolt comprises an anchoring sleeve, preferably cylindrical, which radially outside has a second anchoring structure and radially inside has an inner diameter d. H exhibits for which the following applies: d H ≤ D B3, so that the anchoring sleeve is arranged in a pre-assembled state in a form-fitting manner in the positioning area, preferably by means of an interference fit, and during a setting process the head area can be moved into the anchoring sleeve by means of a tool, thereby achieving a friction-fit fastening of the two-part expansion threaded bolt in the receiving bore.

[0010] The two-part expansion threaded bolt according to the invention is described below with reference to its use for better comprehension.

[0011] Initially, the threaded bolt and the anchoring sleeve are provided, with the anchoring sleeve being pushed onto the threaded bolt from the second axial end of the threaded bolt. Since the second outer diameter D B2 in the mounting area is smaller than the inner diameter d HThe anchoring sleeve can be pushed onto the threaded bolt up to the positioning area.

[0012] The positioning area is separated from the fastening area by a step and has a different outer diameter D compared to the second outer diameter. B2 larger third outer diameter D B3 on. The inner diameter d H The anchoring sleeve is equal to or less than the third outer diameter D. B3 . Thus, the anchoring sleeve can be arranged in the positioning area in a form-fitting manner, preferably by means of an interference fit.

[0013] The positioning area transitions via a further stage into the head area, which has a first outer diameter D B1 and the first anchoring structure. The first outer diameter D B1 is larger than the third outer diameter D B3Additionally, the head area has a flange with an outer diameter D at the first axial end. B4 This is arranged axially opposite the step, so that the first anchoring structure is located between the flange and the step. The first outer diameter D B1 is thus defined by the first anchoring structure in the head area.

[0014] The threaded bolt, equipped with the anchoring sleeve provided on the positioning area, is inserted into a receiving opening of a first component such that the anchoring sleeve is positioned within the receiving opening, preferably completely. The first component is, in particular, made of a soft material, so that the second anchoring structure of the anchoring sleeve can be effectively pressed into the material during the subsequent steps. In this context, it is especially preferred that the receiving bore is unthreaded. This ensures a reliable connection between the first component and the expansion threaded bolt when the expansion threaded bolt is initially inserted or fastened.

[0015] To secure the two-part expansion threaded bolt in the receiving opening or bore, the bolt is moved relative to the anchoring sleeve using a tool so that the head engages with the sleeve. This can be achieved by pushing or pulling the bolt into the sleeve, with the tool securing the sleeve in its position within the bore. This engages the first anchoring element with the inside of the anchoring sleeve. To ensure a particularly reliable connection between the anchoring sleeve and the head, the inside of the anchoring sleeve is preferably unthreaded.

[0016] By moving the head section into the anchoring sleeve, the anchoring sleeve expands radially, so that the anchoring sleeve, equipped with the second anchoring structure, is pressed into the wall of the receiving bore. Preferably, the threaded bolt is moved until the flange at the first axial end of the threaded bolt rests against the anchoring sleeve. In this state, the two-part expansion threaded bolt is frictionally secured in the first component.

[0017] To create a connection with a second component, the latter is positioned so that an opening in the second component aligns with the threaded bolt attached to the first component. The second component can then be fastened by means of a nut screwed onto the fastening area. To ensure a sufficiently strong connection, the fastening area of ​​the threaded bolt preferably meets at least the requirements of strength class 8.8.

[0018] In contrast to the prior art, the anchoring sleeve is not pre-assembled in the head area, but in a separate section. Therefore, a one-piece design is not required; instead, a two-piece design is used.

[0019] The two-part expansion threaded bolt according to the invention overcomes the disadvantages of the prior art due to the specific design and dimensioning of its components and enables reliable installation of the two-part expansion threaded bolt in the receiving bore. In particular, potential damage to the anchoring sleeve and / or the first component in the area of ​​the receiving bore can be reduced or prevented.

[0020] In a preferred embodiment of the two-part expansion threaded bolt, the axial extent of the positioning area is between 10 and 20% of the axial extent L. Hthe anchoring sleeve. This allows for particularly effective pre-assembly of the anchoring sleeve onto the threaded bolt.

[0021] Furthermore, it is advantageous that the anchoring sleeve of the two-part expansion threaded bolt is made of free-cutting steel and has been soft-annealed at a temperature of 700–750 °C, preferably 730 °C, and / or has a hardness between 130 HV 0.3 and 170 HV 0.3, preferably 150 HV 0.3. Soft annealing, in particular, improves the cold formability of the anchoring sleeve. It also reduces the hardness and strength. The hardness of the anchoring sleeve material ensures that the second anchoring structure of the sleeve can effectively press into the material of the first component, while conversely, the first anchoring structure of the threaded bolt can be pressed securely into the anchoring sleeve. This results in a further optimized connection between the first component, the anchoring sleeve, and the threaded bolt.

[0022] According to another advantageous embodiment of the two-part expansion threaded bolt, the second anchoring structure comprises one of the following: left-hand knurling, right-hand knurling, left-right knurling, or cross knurling. The choice of knurling allows for adaptation to the material of the first component in which the two-part expansion threaded bolt is to be fastened.

[0023] Furthermore, it is advantageous for the second anchoring structure to have at least one circumferential recess and / or at least one circumferential projection. The recess provides space for the component material, thus improving the axial pull-out strength. Similarly, the projection also leads to a further improved hold in the component's receiving bore, thereby also improving the axial pull-out strength. This is because the projection can penetrate deeper into the material of the first component and / or provides a larger contact area in the receiving bore, so that, especially in conjunction with an unthreaded receiving bore, a higher frictional engagement value can be achieved.

[0024] In a further preferred embodiment of the two-part expansion threaded bolt, the anchoring sleeve has a wall thickness between 0.65 and 1.0 mm, preferably 0.7 to 0.85 mm, and / or has an axial extent between 5 and 9 mm, and / or is radially unthreaded on the inside. A further preferred ratio of the inner diameter d H based on the outer diameter of the anchoring sleeve at approximately 0.8.

[0025] The relatively thin wall thickness, compared to state-of-the-art designs, allows for further optimization of the two-part expansion threaded bolt while simultaneously ensuring reliable fastening in the component's receiving bore. The height of the anchoring sleeve's axial extension is selected based on the component's thickness, making the two-part expansion threaded bolt particularly adaptable to the specific component and its material. The internally unthreaded design ensures that, during the initial fastening of the bolt head into the anchoring sleeve, the primary anchoring structure engages very effectively with the sleeve.

[0026] Furthermore, it is advantageous that for the inner diameter d H The following applies to the anchoring sleeve: 0.85 D B1 ≤ d H ≤ 0.92 D B1 and / or 0.97 D B3 ≤ d H < 1.0 D B3These dimensions allow for an advantageous coordination of the anchoring sleeve and threaded bolt, so that the anchoring sleeve is on the one hand securely held in the positioning area and on the other hand a radial expansion of the anchoring sleeve occurs through the head area, which ensures the friction-fit fastening in the first component.

[0027] Finally, it is preferred that the first anchoring structure be provided with knurling running parallel to the longitudinal axis. The first anchoring structure designed in this way provides anti-rotation protection while still allowing effective movement of the head of the threaded bolt into the anchoring sleeve.

[0028] A first component according to the invention has a receiving bore in which a two-part expansion threaded bolt according to the invention is fastened, the head region being at least partially arranged in the anchoring sleeve, so that a friction-fit fastening of the two-part expansion threaded bolt in the receiving bore is provided. Preferably, the first component comprises one of the following materials: wood, aluminum, thermoplastics, thermosets, or a fiber-reinforced composite material. The first component according to the invention thus has the two-part expansion threaded bolt according to the invention. With regard to the resulting advantages and technical effects as well as the use, reference is made to the above descriptions to avoid repetition. With regard to the component material, soft materials are particularly preferred, such as those preferably listed above.This is because soft component materials in particular allow the second anchoring structure of the anchoring sleeve to be pressed easily into the component.

[0029] A fastening method for a two-part expansion threaded bolt according to the invention in a component with a receiving bore comprises the following steps: providing the two-part expansion threaded bolt according to the invention, inserting the two-part expansion threaded bolt into the receiving bore so that the anchoring sleeve is arranged in the receiving bore, and setting the inserted two-part expansion threaded bolt with a tool by moving the head region into the anchoring sleeve, thereby achieving a friction-fit fastening of the two-part expansion threaded bolt in the receiving bore. The fastening method utilizes the two-part expansion threaded bolt according to the invention. With regard to the resulting advantages and technical effects, reference is therefore made to the above descriptions.

[0030] In one example of the fastening method, the head region of the threaded bolt is moved so far into the anchoring sleeve that the anchoring sleeve is positioned between the stop or flange of the threaded bolt and the tool in its axial length L. H is compressed. 4. Brief summary of the drawings

[0031] The present invention is described in detail below with reference to the drawings. Identical reference numerals in the drawings denote identical components and / or elements. The drawings show: Fig. 1 a partial sectional view of an embodiment of a two-part expansion threaded bolt according to the invention, Fig. 2 a partial sectional view of a first embodiment of an anchoring sleeve, Fig. 3 a partial sectional view of a second embodiment of an anchoring sleeve, Fig. 4 a side view of an embodiment of a two-part expansion threaded bolt according to the invention, wherein the anchoring sleeve has not yet been arranged on the threaded bolt, Fig. 5 a side view of the embodiment according to Fig. 4, wherein the anchoring sleeve is located in front of the positioning area, Fig. 6 a side view of the embodiment according to Fig. 4, wherein the anchoring sleeve is located on the positioning area, Fig. 7 a side view of the embodiment according to Fig. 4, wherein the anchoring sleeve is arranged in the head area (installed state), Fig. 8 a sectional view of the view according to Fig. 6 with first component, Fig. 9 a sectional view of the view according to Fig. 7 with first component, Fig. 10 a partial sectional view of the two-part expansion threaded bolt in the first component, wherein the anchoring sleeve is located in the positioning area, Fig. 11 a partial sectional view of the two-part expansion threaded bolt in the first component in the installed state, Fig. 12 a partial sectional view of a third embodiment of an anchoring sleeve, Fig. 13 a partial sectional view of a fourth embodiment of an anchoring sleeve, Fig. 14 a partial sectional view of a fifth embodiment of an anchoring sleeve, Fig. 15 a partial sectional view of a sixth embodiment of an anchoring sleeve, Fig. 16 a partial sectional view of a seventh embodiment of an anchoring sleeve, Fig. 17 a partial sectional view of an eighth embodiment of an anchoring sleeve and Fig. 18 a schematic procedure of an exemplary fastening method. 5. Detailed description of preferred embodiments

[0032] Referring to Fig. Section 1 discusses an embodiment of an expansion threaded bolt 1 according to the invention. The expansion threaded bolt 1 consists of two components or parts: threaded bolt 10 and anchoring sleeve 50.

[0033] Firstly, referring to Fig. Section 2 discusses one embodiment of the anchoring sleeve 50, which is preferably cylindrical. The statements made here apply analogously to all other embodiments of the anchoring sleeve discussed, unless otherwise indicated.

[0034] The anchoring sleeve 50 has a third 52 and a fourth axial end 54. Radially inside, the anchoring sleeve 50 has an inner diameter d H on.

[0035] Radially outward, the in Fig. The anchoring sleeve 50 shown in Figure 2 incorporates a second anchoring structure 56, which extends fully and continuously between the third 52 and fourth axial ends 54. This structure features a right-left knurling. A cross-knitting could also be used instead of the right-left knurling. This differs from the right-left knurling in its orientation, as the first knurling direction in the cross-knitting runs parallel to the longitudinal axis and the second knurling direction runs perpendicular to the longitudinal axis. In contrast, the knurling in the right-left knurling runs, for example, at an angle of ± 45° to the longitudinal axis. A left-hand knurling or a right-hand knurling can also be used instead of a left-right knurling or a cross-knitting. This depends on the material of the first component 3, and some exemplary designs in conjunction with different materials for the first component 3 will be discussed later.

[0036] The wall thickness of the anchoring sleeve 50 is between 0.65 and 1.0 mm, preferably 0.7 to 0.85 mm. An axial length or extent L H The diameter is between 5 and 9 mm. As indicated above, the anchoring sleeve 50 is radially unthreaded on the inside. The ratio of the inner diameter d H relative to an outer diameter D H The thickness of the anchoring sleeve 50 is, for example, at least 0.7, preferably 0.75, and particularly preferably approximately 0.8. The resulting low wall thickness, compared to the prior art, allows for further optimization of the two-part expansion threaded bolt 1 while simultaneously ensuring reliable fastening in the receiving bore of the first component 3.

[0037] The height of the axial extent L HThe anchoring sleeve 50 is selected depending on the thickness of the first component 3, so that the two-part expansion threaded bolt 1 can be adapted particularly effectively to the respective first component 3 and the component material.

[0038] On Fig. With reference to Figure 3, an alternative embodiment of an anchoring sleeve 150 is already shown. In this embodiment, the anchoring sleeve 150 has, in addition to the second anchoring structure 56 (left-right knurling), two recesses 58. These recesses are formed circumferentially and are spaced apart from the third 52 and fourth axial ends 54. The recesses 58 provide a space into which material from the first component 3 can flow or be displaced when the expansion thread bolt 1 is inserted. This improves the fastening of the expansion thread bolt 1 in the first component 3.

[0039] Furthermore, the expansion threaded bolt 1 comprises the threaded bolt 10. The threaded bolt 10 has a first axial end 12, a second axial end 14, and an axial length or extent L. B From the first axial end 12 towards the second axial end 14, the threaded bolt 10 comprises a head region 20, a positioning region 30 and a fastening region 40.

[0040] The head region 20 has a flange 24 with an outer diameter D at its first axial end 12. B4 In the direction of the second axial end 14, the head region adjacent to the flange 24 comprises a first anchoring structure 22. The first anchoring structure 22 defines a first outer diameter D B1 of the head area. This is less than or equal to the outer diameter D. B4of the flange 24. The first anchoring structure 22 is provided with knurling running parallel to the longitudinal axis. The first anchoring structure 22, designed in this way, provides anti-rotation protection and yet allows effective movement of the head region 20 of the threaded bolt 10 into the anchoring sleeve 50, as will become clear later with reference to its use.

[0041] The positioning area 30 adjoins the head area 20, with the head area 20 and the positioning area 30 being separated from each other by a step 26. Therefore, the positioning area 30 has a third outer diameter D. B3 on, which is smaller than the first outer diameter D B1 The positioning area 30 is preferably cylindrical and has a smooth surface, i.e., neither a thread nor an anchoring structure. The axial extent of the positioning area 30 is between 10 and 20% of the axial extent L.H the anchoring sleeve 50.

[0042] The positioning area 30 adjoins the mounting area 40 in the direction of the second axial end 14. The mounting area 40 is separated from the positioning area 30 by a step 32. The mounting area 40 also has a second outer diameter D. B2 on, which is defined by an external thread 42 present in the fastening area 40. In addition to the external thread 42, the fastening area 40 can also have a threadless area 44.

[0043] With regard to the material used, the anchoring sleeve 50 of the two-part expansion threaded bolt 1 is made of free-cutting steel and has been annealed at a temperature of 700–750 °C, preferably 730 °C, and / or has a hardness between 130 HV 0.3 and 170 HV 0.3, preferably 150 HV 0.3. The hardness refers to the finished anchoring sleeve 50, i.e., the anchoring sleeve 50 pre-assembled on the threaded bolt 10.

[0044] Soft annealing improves the cold formability of the anchoring sleeve 50. Furthermore, soft annealing reduces its hardness and strength. The hardness of the anchoring sleeve 50 material ensures that the second anchoring structure 56 of the anchoring sleeve 50 can effectively press into the material of the first component 3, while conversely, the first anchoring structure 22 of the threaded bolt 10 can be pressed securely into the anchoring sleeve 50.

[0045] Now, referring to the Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. Section 11 explains the use of the expansion threaded bolt 1. The expansion threaded bolt 1 is to be fastened in a first component 3, which includes a receiving bore. Preferably, the first component 3 comprises one of the following materials: wood, aluminum, thermoplastics, thermosets, or a fiber-reinforced composite. Soft materials are particularly preferred with regard to the component material, as they allow the second anchoring structure 56 of the anchoring sleeve 50 to be easily pressed into the first component 3.

[0046] Initially, the threaded bolt 10 and the anchoring sleeve 50 are provided, with the anchoring sleeve 50 being pushed onto the threaded bolt 10 from the second axial end 14 of the threaded bolt 10. Preferably, the third axial end 52 of the anchoring sleeve 50 faces the first axial end 12 of the threaded bolt 10. This orientation is particularly relevant for some of the alternative embodiments of the anchoring sleeve discussed later. Since the second outer diameter D B2 in the mounting area 40 is smaller than the inner diameter d H The anchoring sleeve 50 can be pushed onto the threaded bolt 10 up to the positioning area 30.

[0047] The positioning area 30 is separated from the fastening area 40 by the step 32 and has the following in comparison to the second outer diameter D B2 larger third outer diameter D B3 up. For the inner diameter d Hthe anchoring sleeve 50 applies d H ≤ D B3 , so that the anchoring sleeve 50 is arranged in the positioning area 30 in a form-fitting manner, preferably by means of an interference fit. Therefore, preferably 0.97 D applies. B3 ≤ d H < 1.0 D B3 These dimensions in particular allow for an advantageous coordination of the anchoring sleeve 50 and the threaded bolt 10, so that the anchoring sleeve 50 is securely held in place within the positioning area 30.

[0048] The positioning area 30 transitions via stage 26 into the head area 20, which has a first outer diameter D B1 and has the first anchoring structure 22. The first outer diameter D B1 is larger than the third outer diameter D B3 Additionally, the head region 20 has a flange 24 with an outer diameter D at the first axial end 12. B4This is arranged axially opposite the step 26, so that the first anchoring structure 22 is located between the flange 24 and the step 26, as explained above. The first outer diameter D B1 is thus defined by the first anchoring structure 22 in the head area 20, as also explained above.

[0049] For the inner diameter d H The following applies to the anchoring sleeve 50 in this respect: 0.85 D B1 ≤ d H ≤ 0.92 D B1 . In this way, the anchoring sleeve 50 is radially widened by the head area 20, which ensures the friction-fit fastening in the first component 3, which will now be explained.

[0050] The threaded bolt 10, provided with the anchoring sleeve 50 supplied on the positioning area 30, is inserted into a receiving opening of a first component 3 such that the anchoring sleeve 50 is arranged in the receiving opening, preferably completely. In this respect, reference is made to the illustration in the Fig. 8 and Fig. 10 referred.

[0051] The first component 3 is made of a soft material, allowing the second anchoring structure 56 of the anchoring sleeve 50 to be effectively pressed into the material during subsequent steps. In this context, it is particularly preferred that the receiving bore is unthreaded. This ensures a reliable connection between the first component 3 and the expansion bolt 1 when the expansion bolt 1 is initially installed or fastened.

[0052] To secure the two-part expansion threaded bolt 1 in the receiving opening or bore, the threaded bolt 10 is moved relative to the anchoring sleeve 50 using a tool so that the head region 20 engages with the anchoring sleeve 50. This can be achieved by pushing or pulling the threaded bolt into the anchoring sleeve 50, with the tool securing the anchoring sleeve 50 in its position within the receiving bore. This engages the first anchoring structure 22 with the inside of the anchoring sleeve 50. To create a particularly reliable connection between the anchoring sleeve 50 and the head region 20, the inside of the anchoring sleeve 50 is therefore preferably designed without threads.The internally unthreaded design of the anchoring sleeve 50 allows the first anchoring structure 22 provided there to engage particularly effectively with the anchoring sleeve 50 when the head area 20 of the threaded bolt 10 is first fastened in the anchoring sleeve 50.

[0053] By moving the head section 20 into the anchoring sleeve 50, the anchoring sleeve 50 expands radially, so that the anchoring sleeve 50, provided with the second anchoring structure 56, is pressed into the wall of the receiving bore. Preferably, the threaded bolt 10 is moved until the flange 24 at the first axial end 12 of the threaded bolt 10 abuts the anchoring sleeve 50, in particular the third axial end 52 of the anchoring sleeve 50. In this state, the two-part expansion threaded bolt 1 is frictionally secured in the first component 3. In this respect, we refer to the Fig. 9 and Fig. 11.

[0054] To create a connection (not shown) with a second component, the latter is positioned such that an opening in the second component is aligned with the threaded bolt 10 attached to the first component 3. The second component can then be fastened by means of a nut screwed onto the fastening area 40. To create a sufficiently strong connection, the fastening area 40 of the threaded bolt 10 preferably meets at least the requirements of strength class 8.8.

[0055] In contrast to the prior art, the anchoring sleeve 50 is therefore not pre-assembled in the head area 20, but in a separate area, the positioning area 30. For this reason, a one-piece design is not required, but a two-piece design is used.

[0056] The two-part expansion threaded bolt 1 according to the invention overcomes the disadvantages of the prior art due to the specific design and dimensions of its components, threaded bolt 10 and anchoring sleeve 50, and enables reliable insertion or fastening of the two-part expansion threaded bolt 1 in the receiving bore. In particular, potential damage to the anchoring sleeve 50 and / or the first component 3 in the area of ​​the receiving bore can be reduced or prevented.

[0057] Now, referring to the Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16 to Fig. Figure 17 shows various further embodiments of anchoring sleeves 250; 350; 450; 550; 650; 750. These differ in the design of the radial outer surface and thus in the design of the second anchoring structure 56.

[0058] Thus, the items in the Fig. 12 and Fig. The 13 shown versions of the anchoring sleeve 250; 350 exclusively feature left- or right-hand knurling. This type is preferably used in conjunction with wood as the material for the first component 3.

[0059] The Fig. 14, Fig. 15, Fig. 16 to Fig. Figure 17 again shows a left-right knurling as the second anchoring structure 56 of the anchoring sleeve 450; 550; 650; 750. The in Fig. The embodiment shown in Figure 14 has a projection 60 at the second axial end 54, as well as a recess 54 adjacent to the first axial end 52. In comparison to the one in Fig. In the embodiment shown in Figure 3, the recess 58 located adjacent to the second axial end 54 was thus replaced by a projection 60 at the second axial end 54.

[0060] Fig. Figure 15 shows an embodiment of the anchoring sleeve 550 in which a projection 60 is present at both axial ends 52, 54. The two embodiments according to the Fig. 14 and Fig. 15 are preferably used in conjunction with a first component 3 made of a thermoplastic.

[0061] Finally, the Fig. 16 and Fig. 17 Two further embodiments of an anchoring sleeve 650; 750, which are preferably used in conjunction with a first component 3 made of a thermoset or a fiber-reinforced composite material. Thus, the one in Fig. In the embodiment shown in Figure 16, a projection 60 is indeed present, but not at the second axial end 54, but rather at the first axial end 52. Furthermore, the projection 60 has a greater axial extent, so that, especially in conjunction with a threadless receiving bore in the first component 3, a higher frictional engagement can be achieved.

[0062] The in Fig. The embodiment of the anchoring sleeve 750 shown in Figure 17 uses the recesses 58 instead of the recesses shown in Figure 17. Fig. 3 two analogously designed projections 60. These also penetrate the material of the first component 3 particularly effectively, thus improving the fastening.

[0063] Finally, referring to Fig.Section 18 describes an exemplary fastening method. In a first step A, an embodiment of the two-part expansion threaded bolt 1 is provided. In the subsequent step B, this bolt is inserted into the receiving bore of the first component 3, so that the anchoring sleeve 50; 150; 250; 350; 450; 650; 750 is positioned in the receiving bore. Finally, in step C, the inserted two-part expansion threaded bolt 1 is inserted into the anchoring sleeve 50 using a tool by moving the head region 20, thereby achieving a friction-fit fastening of the two-part expansion threaded bolt 1 in the receiving bore. Advantageously, the head region 20 of the threaded bolt 1 is moved into the anchoring sleeve 50 to such an extent that the anchoring sleeve 50 is positioned between the stop or flange 24 of the threaded bolt 10 and the tool along its axial length L. H is compressed. 6. List of reference symbols 1 Expansion threaded bolt 3 components 10 threaded bolts 12 first axial end 14 second axial end 20 Head area 22 first anchoring structure 24 flange Level 26 30 Positioning area Level 32 40 Mounting area 42 external threads 44 threadless area 50 Anchoring sleeve (1st design) 52 third axial end 54 fourth axial end 56 second anchoring structure 58 recess 60 lead 150 Anchoring sleeve (2nd design) 250 Anchoring sleeve (3rd design) 350 Anchoring sleeve (4th design) 450 Anchoring sleeve (5th design) 550 Anchoring sleeve (6th design) 650 Anchoring sleeve (7th design) 750 Anchoring sleeve (8th design) d H Inner diameter of the anchoring sleeve 50 D B1 Outer diameter in the head area 20 D B2 Outer diameter in the mounting area 40 D B3 Outer diameter in the positioning area 30 D B4 Flange outer diameter 24 D H Outer diameter of the anchoring sleeve 50 L B axial length / extent of the threaded bolt 10 L H axial length / extent of the anchoring sleeve 50 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 0 080 558 A1

[0003] US 3,683,740

[0004] DE 197 32 239 A1

[0005]

Claims

[1] A two-part expansion threaded bolt (1) for installation in a receiving bore of a component (3), comprising: a) a threaded bolt (10) with a first axial end (12) and an opposing second axial end (14) which has: a1) at the first axial end (12) a cylindrical head region (20) which radially outside a first anchoring structure (22) and a first outer diameter D B1 exhibits a2) at the second axial end (14) a fastening area (40) which is at least partially provided with an external thread (42) and in the area of ​​the external thread (42) has a second outer diameter D B2 exhibits a diameter smaller than the first outer diameter D B1 , and a3) a, preferably cylindrical, positioning area (30) between the head area (20) and the mounting area (40), which is separated from the head area (20) and the mounting area (40) by a step (26, 32) and has a third outer diameter D B3 exhibits a diameter smaller than the first outer diameter D B1 and larger than the second outer diameter D B2 is, as well as b) an anchoring sleeve (50; 150; 250; 350; 450; 550; 650; 750), preferably cylindrical, which has a second anchoring structure (56) radially outside and an inner diameter d radially inside H exhibits for which the following applies: d H ≤ D B3 , so that c) the anchoring sleeve (50; 150; 250; 350; 450; 550; 650; 750) is arranged in a pre-assembled state in a form-fitting manner in the positioning area (30), preferably by means of an interference fit, and d) during a setting process the head area (20) can be moved into the anchoring sleeve (50) by means of a tool, thereby enabling a friction-fit fastening of the two-part expansion threaded bolt (1) in the receiving bore. [2] The two-part expansion threaded bolt (1) according to claim 1, wherein an axial extent of the positioning area (30) is between 10 and 20% of the axial extent L H the anchoring sleeve (50; 150; 250; 350; 450; 550; 650; 750). [3] The two-part expansion threaded bolt (1) according to one of the preceding claims, wherein the anchoring sleeve (50; 150; 250; 350; 450; 550; 650; 750) is made of free-cutting steel and a) annealed at a temperature of 700 - 750 °C, preferably 730 °C and / or b) has a hardness between 130 HV 0.3 and 170 HV 0.3, preferably 150 HV 0.

3. [4] The two-part expansion threaded bolt (1) according to one of the preceding claims, wherein the second anchoring structure (56) comprises one of the following: a left knurling, a right knurling, a left-right knurling or a cross knurling. [5] The two-part expansion threaded bolt (1) according to one of the preceding claims, wherein the second anchoring structure (56) has at least one circumferentially extending recess (58) and / or at least one circumferentially extending projection (60). [6] The two-part expansion threaded bolt (1) according to one of the preceding claims, wherein the anchoring sleeve (50; 150; 250; 350; 450; 550; 650; 750) a) has a wall thickness between 0.65 and 1.0 mm, preferably 0.7 to 0.85 mm, and / or b) an axial extent L H between 5 and 9 mm and / or c) is radially internally threadless. [7] The two-part expansion threaded bolt (1) according to one of the preceding claims, wherein the inner diameter d H applies: a) 0.85 D B1 ≤ d H ≤ 0.92 D B1 and / or b) 0.97 D B3 ≤ d H < 1.0 D B3 . [8] The two-part expansion threaded bolt (1) according to one of the preceding claims, wherein the first anchoring structure (22) is provided with a knurling extending parallel to the longitudinal axis. [9] A first component (3) with a receiving bore, wherein a two-part expansion threaded bolt (1) according to one of the preceding claims is fastened in the receiving bore, wherein the head region (20) is at least partially arranged in the anchoring sleeve (50; 150; 250; 350; 450; 550; 650; 750) so that a friction-fit fastening of the two-part expansion threaded bolt (1) is provided in the receiving bore. [10] The first component (3) according to claim 9, wherein the first component (3) comprises one of the following materials: wood, aluminium, thermoplastics, thermosets or a fiber composite material.

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