FASTENING ARRANGEMENT, IN PARTICULAR FOR ATTACHING AN ELECTRIC DRIVE TO AN ELECTRIC BICYCLE

Description

State of the art

[0001] The present invention relates to a fastening arrangement configured to enable the fastening of a drive to a frame component of a bicycle with two opposing holes. Furthermore, the present invention relates to an electric bicycle with such a fastening arrangement for fixing the electric drive to a frame component of the electric bicycle. Such fastening arrangements are known, for example, from DE 10 2016 112778 A1, US 10 300 985 B2, DE 10 2017 201617 A1, US 9 904 073 B2, and DE 10 2017 214190 A1. Document US 10 300 985 B2 discloses the features of the preamble of claim 1.

[0002] When attaching components using fastening arrangements, different, sometimes contradictory, aspects often have to be taken into account. Special requirements arise, in particular, when mounting an electric drive to a bicycle frame. Firstly, the fastening arrangement must achieve mechanical stability over the entire service life. Furthermore, tolerance compensation between the mechanical interfaces of the electric drive and the hollow frame or an open bracket or similar must be possible. To attach electric drives to a bicycle frame, through-bolts are usually used which pass through two opposite holes. Tolerance compensation is achieved here by elastic deformation in the area of ​​the interface between the through-bolt and the frame.However, this introduces mechanical stresses into the system. Another problem is that the frame, as a hollow component, forms a resonant body, so that noise generated by the electric drive during operation is amplified by the hollow frame or leads to vibrations in the electric bicycle. Therefore, it would be desirable to implement an improved attachment of a device to a hollow component, especially an electric drive to a bicycle frame or similar. Disclosure of the invention

[0003] The fastening arrangement according to the invention with the features of claim 1 has the advantage, on the one hand, that a high level of mechanical stability is achieved over the service life of the components to be fastened and, on the other hand, that tolerance compensation is possible at a mechanical interface between the device to be fastened and the hollow component. Furthermore, the fastening arrangement according to the invention requires only a small amount of space and, moreover, also enables noise reduction if the device to be fastened generates noise during operation, which noise could be amplified by the hollow component acting as a resonance body. This is achieved according to the invention in that the fastening arrangement for fastening a device to a hollow component with two opposite holes has a first screw with a head and a sliding sleeve.The first headed screw is designed to be passed through at least a first of the two holes. The sliding sleeve is designed to receive the first screw, for example, in the second of the two holes, wherein the sliding sleeve is displaceable relative to the hollow component and / or the device to be fastened. The sliding sleeve thus allows tolerance compensation to be achieved in a simple and secure manner. The sliding sleeve can be used to fasten the first screw or, alternatively, as an intermediate component for a counter-element to the first screw, for example, a second screw or a nut or the like.

[0004] According to the invention, the fastening arrangement comprises a first screw with a head, which is designed to be passed through the first of the holes in the hollow component. Furthermore, the sliding sleeve is provided with a tolerance-dependent outer diameter, which is designed to receive the first screw at the other of the holes. The outer diameter of the sliding sleeve is selected such that a clearance fit is present with the other hole, in which the first screw is not arranged. The clearance fit enables simple and secure tolerance compensation while maintaining the necessary mechanical stability of the fastening arrangement. Furthermore, the sliding sleeve provides a possibility for noise reduction if the device to be fastened generates noise during operation, which is possible, for example, with an electric drive of a bicycle.

[0005] The subclaims show preferred developments of the invention.

[0006] Preferably, the sliding sleeve has an internal thread for receiving the first screw, and the first screw preferably has an external thread that can be engaged with the internal thread of the sliding sleeve. This allows for a minimal number of parts and, in particular, a small space requirement and a low weight of the fastening arrangement.

[0007] More preferably, the fastening arrangement further comprises a second screw, which is preferably connected directly or alternatively indirectly to the first screw. Preferably, the first screw has a blind hole with an internal thread, which is configured to receive the second screw, which has an external thread. Alternatively, the second screw has a blind hole with an internal thread, which is configured to receive the first screw with a correspondingly formed external thread. Instead of a blind hole, a through hole can also be provided.

[0008] Particularly preferably, the first screw is designed such that it is longer than the second screw. In this case, the first screw is particularly preferably designed such that the first screw has a length that extends through both the first and second holes in the hollow component.

[0009] More preferably, the sliding sleeve comprises a main body and an inner flange. The main body and the inner flange are made of two different materials. The main body defines the outer diameter of the sliding sleeve, in particular with a clearance fit. The inner flange is made of a harder material than the main body.

[0010] The inner flange is preferably made of a metal material and the main body of a plastic material.

[0011] More preferably, the sliding sleeve further comprises an outer flange. The outer flange is preferably made of the same material as the inner flange. Particularly preferably, the inner flange and the outer flange are made as perforated discs or washers. The main body is arranged between the inner flange and the outer flange. The inner flange preferably has a larger outer diameter than the main body. The outer flange preferably has a smaller diameter than the main body. The outer flange and the inner flange can be firmly connected to the main body, or alternatively, the outer flange and the inner flange are only loosely attached to the main body. During assembly of the fastening arrangement, the outer flange and the inner flange are pressed against the end faces of the hollow cylindrical main body, which is elastically deformed in order to compensate for tolerances and to secure the body.

[0012] More preferably, the fastening arrangement comprises a first bushing and a second bushing, wherein the first screw is passed through the first and second bushing.

[0013] The first bushing preferably has an inner bushing and an outer bushing, wherein the inner bushing and the outer bushing are made of different materials. The inner bushing is preferably made of a harder material than the outer bushing. Similarly, the second bushing has an inner bushing and an outer bushing, which are preferably made of different materials. Further preferably, in the second bushing, the inner bushing has an internal thread configured to engage with an external thread of the first screw.

[0014] Particularly preferably, the first bushing and the second bushing each have an outwardly directed flange. The outwardly directed flange is particularly preferably provided on both the inner bushing and the outer bushing.

[0015] The material of the inner bushing of the first and second bushings is preferably a hard-elastic material, in particular metal. The material of the outer bushing of the first and second bushings is preferably a soft-elastic material, in particular a plastic.

[0016] According to a further preferred embodiment of the present invention, the fastening arrangement further comprises a first and / or second intermediate element made of a steel wire mesh, each of the intermediate elements having a central opening. The intermediate elements are preferably bush-shaped, with the first screw and / or the second screw passing through the central opening of the intermediate elements.

[0017] Furthermore, the invention relates to an electric bicycle with a fastening arrangement according to the invention. drawing

[0018] Preferred embodiments of the invention are described in detail below with reference to the accompanying drawings. In the drawing: Figure 1 shows a schematic sectional view of a fastening arrangement of an electric drive to a bicycle frame according to a first exemplary embodiment of the invention, Figure 2 shows a schematic sectional view of a fastening arrangement of an electric drive to a bicycle frame according to a second exemplary embodiment of the invention, Figure 3 shows a schematic sectional view of a fastening arrangement of an electric drive to a bicycle frame according to a third exemplary embodiment of the invention, Figure 4 shows a schematic, perspective view of an element made of steel wire mesh of Figure 3, Figure 5 is a schematic sectional view of a fastening arrangement of an electric drive to a bicycle frame according to a fourth embodiment of the invention, and Figure 6 is a schematic sectional view of a fastening arrangement of an electric drive to a bicycle frame according to a fifth embodiment of the invention. Preferred embodiments of the invention

[0019] The following is based on reference to Figure 1 a fastening arrangement 1 according to a first preferred embodiment of the invention is described in detail.

[0020] The fastening arrangement 1 is designed to fasten a device 2, in this embodiment an electric drive of a bicycle with a multi-part housing 2a, 2b, to a hollow component 3, in this embodiment a frame component of the bicycle.

[0021] As from Figure 1As can be seen, the hollow component 3 comprises a first hole 31 and a second hole 32. The two holes are arranged opposite one another on the hollow component. The device 2, which has a through-opening 20, is arranged between the two holes. The fastening arrangement 1 is guided through the through-opening 20 in the device 2. The fastening arrangement 1 comprises a first screw 4 with a head 40 and a sliding sleeve 6. The sliding sleeve 6 is designed to receive the first screw 4, in particular in the second hole 32, wherein the sliding sleeve 6 is displaceable relative to the hollow component 3 and to the device 2.

[0022] The sliding sleeve 6 comprises a hollow cylindrical main body 60, an inner flange 61, and an outer flange 62. The inner flange 61 has a larger outer diameter than the outer diameter of the main body 60. The outer flange 62 has a smaller outer diameter than the outer diameter of the main body 60. The sliding sleeve 6 is made of two different materials. The main body 60 is made of a soft, flexible material, for example, plastic. In particular, the main body 60 is elastically deformable. The inner flange 61 and the outer flange 62 are made of a hard, elastic material, for example, metal. In this exemplary embodiment, the inner flange 61 and the outer flange 62 are provided as perforated disks. The inner flange 61 and the outer flange 62 are each only applied to the front end regions of the main body 60.

[0023] The main body 60 defines with its outer diameter a clearance fit 9 to the second hole 32 of the hollow component 3. This enables a displacement of the sliding sleeve 6 in the axial direction XX of the first screw 4.

[0024] The fastening arrangement 1 further comprises a second screw 5 as well as a first bushing 7 and a second bushing 8.

[0025] The second screw 5 has a head 50 and a body with an external thread 51. As can be seen from Figure 1As is clear, a length in the axial direction XX of the second screw 5 is shorter than a length of the first screw 4. The second screw 5 is significantly shorter than the first screw 4. The first screw 4 has a length such that it passes through both the first hole 31 and the second hole 32. Furthermore, the first screw 4 has a blind hole 42 with an internal thread 43. The second screw 5 is screwed with its external thread 51 into the internal thread 43 of the first screw 4. The area of ​​the first screw 4 in which the blind hole 42 is formed is partially arranged inside the sliding sleeve 6.

[0026] The first bushing 7 comprises an inner bushing 70 and an outer bushing 71. The inner bushing 70 and the outer bushing 71 are made of different materials. The inner bushing 70 is preferably made of a metal material, and the outer bushing 71 is made of a plastic material. Both the inner bushing and the outer bushing each have an outwardly directed flange 70a and 71a, respectively (see FIG. Figure 1 ). The second bushing has a similar structure to the first bushing 7, with an inner bushing 80 and an outer bushing 81. The inner bushing 80 has an outwardly directed flange 80a, and the outer bushing 81 has an outwardly directed flange 81a. Furthermore, the second bushing 8 has an internal thread 82 on the inner bushing 80.

[0027] As from Figure 1As can be seen, the first screw 4 has, in addition to the internal thread 43 in the blind hole 42, an additional external thread 41. The external thread 41 engages with the internal thread 82 of the second bushing 8.

[0028] Figure 1 shows a state of the fastening assembly 1 in which the fastening assembly 1 is only in a pre-assembled state. In this case, a gap 10 is still present between the second bushing 8 and the sliding sleeve 6 (cf. Figure 1). In the fully assembled state, the second screw 5 is screwed fully into the blind hole 42 of the first screw 4, whereby the sliding sleeve 6 moves in the direction of arrow A towards the second bushing 8. This closes the gap 10. As soon as contact is established between the sliding sleeve 6 in the area of ​​the inner flange 61 and the second bushing 8 in the area of ​​the flange 80a, an elastic deformation of the main body 60 of the sliding sleeve 6 begins until final fixation. Thus, tolerance compensation can be provided by the sliding sleeve 6 in a simple and effective manner.

[0029] Thus, the fastening arrangement 1 enables a two-stage screw connection, with the main body 60 of the sliding sleeve 6 additionally enabling acoustic insulation of the structural-mechanical transfer path of the electric drive to the hollow frame. The assembly of the fastening arrangement 1 does not introduce any significant stresses into the overall system and, in particular, interrupts an acoustic transfer path from the device 2 to the hollow component 3.

[0030] Furthermore, the first bushing 7 and the second bushing 8 form a stop through their respective inner bushings 70, 80, via which a necessary tension of the fastening arrangement is diverted. Figure 1 shows the state in which a small second gap 11 is present between the inner bushings 70 and 80. The long first screw 4 also fixes the device 2 to the Figure 1left side. Thus, the first screw connection is provided between the first screw 4 and the second bushing 8 and the second screw connection is realized between the first screw 4 and the second screw 5. During the screwing process of the second screw 5, the sliding sleeve 6 is thus displaced in the axial direction XX as a result of the clearance fit 9 until it stops against the flange 80a, until the gap 10 is closed. This enables tolerance compensation between the device 2 and the hollow component 3. Further tolerance compensation is made possible by deforming the two outer bushings 71, 81 and closing the second gap 11. As the second screw 5 is screwed further into the first screw 4, the main body 60 is then elastically deformed as described above, so that the main body 60 is widened in the second hole 32 in such a way that the main body 60 is permanently and firmly clamped in the second hole 32.This also firmly anchors the second side of the fastening arrangement 1 to the frame and enables secure fastening of the electric drive to the frame.

[0031] Figure 2 shows a fastening arrangement 1 according to a second embodiment of the invention. Identical or functionally identical parts are designated by the same reference numerals.

[0032] In contrast to the first embodiment, the fastening arrangement 1 of the second embodiment has a sliding sleeve 6 which has an internal thread 63. The first screw 4 has an external thread 41. The external thread 41 engages with the internal thread 63 of the sliding sleeve 6. Furthermore, a first bushing 7 and a second bushing 8 are provided, whereby the second bushing 8 of the second embodiment does not have an internal thread. The first and second bushings 7 and 8 each have an inner bushing 70, 80 and an outer bushing 71, 81. An axial length of the first and second bushings 7, 8 is different.

[0033] A clearance fit 9 is again formed between the sliding sleeve 6 and the second hole 32. This allows for tolerance compensation. Alternatively, a transition fit can also be provided between the sliding sleeve 6 and the second hole 32. When the first screw 4 is tightened, the sliding sleeve 6 is thus displaced in the axial direction toward the device 2 until the sliding sleeve 6 contacts the flange 80a of the second bushing 8. From the moment of contact, a preload force is then built up to fasten the device 2 to the hollow component 3.

[0034] The Figure 3 and 4 show a fastening arrangement 1 according to a third embodiment of the invention. Identical or functionally identical parts are designated by the same reference numerals as in the previous embodiments.

[0035] The third embodiment additionally comprises damping elements 12, which are arranged between the device 2 and the hollow component 3. More precisely, the damping elements 12, as can be seen from Figure 4visible, disc-like components with a central opening 12a, which are arranged on the left and right on the inner sides of the bicycle frame. The damping elements 12 are thus arranged between the first bushing 7 and the bicycle frame or the second bushing 8 and the bicycle frame. The damping elements 12 are made of a steel wire mesh. The degree of damping and the stiffness of the damping element 12 can be specifically adjusted via the mesh and a predetermined degree of compression. By using the knitted damping elements 12, a thermal and also an electrical connection can thus be realized. The damping element 12 serves in particular to dampen vibrations and to reduce noise transmitted from the device 2 to the hollow component 3. This makes it possible, in particular, to decouple the bicycle frame from the electric drive of the bicycle.CrNi or a corresponding alloy is preferably used as the metal. This offers the advantage of a long service life and high load-bearing capacity. Furthermore, this material is resistant to aging, so no creep or hardening occurs. Otherwise, this embodiment corresponds to the previous embodiment, so reference can be made to the description given there.

[0036] Figure 5 shows a fastening device 1 according to a fourth embodiment of the invention. Identical or functionally identical parts are again designated by the same reference numerals as in the previous embodiments.

[0037] In the fourth embodiment, the sliding sleeve 6 is no longer arranged in the hollow component 3, but in the device 2. As can be seen from Figure 5As can be seen, two sliding sleeves 6 are provided. Furthermore, the sliding sleeves 6 each have an internal thread 63. The internal thread 63 is in engagement with the external thread 41 of the first screw 4 and the external thread 51 of the second screw 5. The sliding sleeves 6 can compensate for tolerances between the hollow component 3 and the device 2. The sliding sleeves 6 are each arranged in the device 2 by means of a clearance fit 9. Preferably, a lubricating grease is introduced into the receiving opening of the device 2 in order to prevent crevice corrosion. In this way, tolerance compensation can be made possible with a very simply constructed fastening arrangement 1.

[0038] Figure 6shows a fastening arrangement 1 according to a fifth embodiment of the invention. Identical or functionally identical parts are designated by the same reference numerals as in the previous embodiments. Similar to the third embodiment, the fifth embodiment has damping elements 12 made of a steel wire mesh, as shown in Figure 4shown. The damping elements 12 enable acoustic decoupling of the device 2 from the hollow component 3. Two sliding sleeves 6 are arranged in corresponding bores or the like in the device 2, as in the fourth embodiment. The first screw 4 and the second screw 5 are each screwed into one of the sliding sleeves 6 in the device 2, as in the fourth embodiment. During the screwing-in process, tolerance compensation can again be achieved by axially displacing the sliding sleeves 6. Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.

Claims

1. Fastening arrangement, designed for fastening an electric drive (2) of a bicycle to a frame component (3) of the bicycle, which frame component has two mutually opposite holes (31, 32), comprising: - a first screw (4) with a head (40), which first screw is designed to pass through a first hole (31) of the holes, and - a sliding sleeve (6) which is designed to receive the first screw (4), wherein the sliding sleeve (6) is displaceable relative to the frame component (3) and / or to the drive (2), characterized in that the sliding sleeve (6) has an outside diameter which is subject to tolerances and is designed to receive the first screw (4) at the second hole (32) of the holes, wherein a clearance fit (9) is formed on the outside diameter of the sliding sleeve, so that the sliding sleeve is displaceable in the axial direction (X-X) of the first screw, in particular in the second hole (32).

2. Fastening arrangement according to Claim 1, wherein the sliding sleeve (6) has an internal thread (63) for receiving the first screw (4).

3. Fastening arrangement according to Claim 1, further comprising a second screw (5), - wherein the first screw (4) has a blind hole (42) with an internal thread (43) and the second screw (5) has an external thread (51) which is designed for screw connection to the internal thread (43) of the blind hole (42), or - wherein the first screw (4) has an external thread and the second screw (5) has a blind hole with an internal thread which is designed to receive the external thread of the first screw (4).

4. Fastening arrangement according to Claim 3, wherein a length of the first screw (4) is greater than a length of the second screw (5).

5. Fastening arrangement according to any of the preceding claims, wherein the sliding sleeve (6) has a main body (60) and an inner flange (61), wherein the main body (60) is made of a different material than the inner flange (61), and wherein the main body (60) has a lower hardness than the inner flange (61).

6. Fastening arrangement according to Claim 5, wherein the sliding sleeve (6) further has an outer flange (62), wherein the outer flange (62) is preferably made of the same material as the inner flange (61).

7. Fastening arrangement according to Claim 6, wherein the outer flange (62) and the inner flange (61) are in the form of perforated discs which are fixedly connected to the main body (60) or which are loosely attached to the main body (60).

8. Fastening arrangement according to any of Claims 5 to 7, wherein the clearance fit (9) is formed on the outer circumference of the main body (60).

9. Fastening arrangement according to any of the preceding claims, further comprising a first bushing (7) and a second bushing (8), wherein the first screw (4) is passed through the first bushing (7) and the second bushing (8).

10. Fastening arrangement according to Claim 9, wherein the first bushing (7) has an inner bushing (70) and an outer bushing (71), and / or - wherein the second bushing (8) has an inner bushing (80) and an outer bushing (81), and - wherein the inner bushing (70, 80) is made of a different material than the outer bushing (71, 81).

11. Fastening arrangement according to Claim 10, wherein a hardness of the inner bushing (70, 80) is greater than a hardness of the outer bushing (71, 81).

12. Fastening arrangement according to Claim 10 or 11, wherein the second bushing (8) has an internal thread (82) and the first screw (4) has an external thread (41) which is in engagement with the internal thread (82) of the second bushing (8).

13. Fastening arrangement according to any of Claims 9 to 12, wherein the first bushing (7) and the second bushing (8) each have an outwardly facing flange at one of their ends, wherein the flange is formed in particular by the inner bushing and the outer bushing.

14. Fastening arrangement according to any of the preceding claims, further comprising a damping element (12) made of a steel wire mesh and having a central opening (12a), wherein at least the first screw (4) is passed through the damping element (12).

15. Fastening arrangement according to any of the preceding claims, wherein the sliding sleeve (6) is arranged in the second hole (32).

16. Electric bicycle, comprising an electric drive (2) and a frame component (3) with two mutually opposite holes (31, 32), comprising a fastening arrangement according to any of the preceding claims.