Tower footing structure and electric bicycle

Abstract

The utility model discloses a tower footing structure and an electric bicycle, the tower footing structure comprises a shell assembly, a main body assembly, a fastener and a one-way rotation clutch structure, the shell assembly comprises a shell and a first bearing, the main body assembly comprises a main body and a second bearing, and the main body and the shell can be freely and detachably connected through the one-way rotation clutch structure; at least one first bearing is arranged between the shell and the shaft roller, and the outer ring of the first bearing is fixedly connected with the shell; the shaft roller is provided with a first step; the fastener is arranged outside the shaft stick and is detachably connected with the shaft stick; the end face, close to one side of the body, of the inner ring of the first bearing abuts against the first step, and the end face, away from one side of the body, of the inner ring of the first bearing abuts against the fastener, so that the inner ring of the first bearing is fixedly connected with the shaft roller. According to the tower footing structure, the main body assembly and the shell assembly can be separated, and the main body assembly and the shell assembly can be independently replaced, so that the use flexibility of the main body assembly and the shell assembly is higher, and the after-sale cost of the tower footing structure is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycles, specifically to a tower base structure and an electric bicycle. Background Technology

[0002] Currently, as people place increasingly higher demands on intelligent travel, electric bicycles are gaining popularity. Mid-to-high-end electric bicycles feature a freehub structure, which refers to the axle of the rear wheel used to mount the freewheel. The freehub structure is a core component of the rear wheel, primarily used for mounting the freewheel and providing drivetrain functionality. With rising demands for intelligent travel, ease of after-sales service (due to increasing labor costs) is becoming increasingly important. Currently, most freehub structures are single, integrated units, and the outer casing that mates with the freewheel cannot be disassembled separately. This makes it particularly difficult to clean and maintain the unidirectional clutch components independently after prolonged use, resulting in very high after-sales costs. Furthermore, in some existing freehub structures, bending and deformation of the axle can increase bearing damping, severely affecting the normal operation of the derailleur and riding. Utility Model Content

[0003] The main purpose of this utility model is to provide a tower base structure and an electric bicycle to solve the problem of inconvenient after-sales replacement of traditional tower base structures.

[0004] To achieve the above objectives, the tower base structure proposed in this utility model includes an outer shell assembly, a main body assembly, fasteners, and a one-way rotation clutch structure. The outer shell assembly includes an outer shell and a first bearing. The main body assembly includes a main body and a second bearing. The main body is fixedly connected to the outer ring of the second bearing. The main body is rotatably mounted outside the shaft roller through the second bearing. The main body and the outer shell are freely detachable and connected through the one-way rotation clutch structure.

[0005] At least one first bearing is provided between the outer shell and the shaft, and the outer ring of the first bearing is fixedly connected to the outer shell;

[0006] The shaft roller is provided with a first step; the fastener is located outside the shaft roller and is detachably connected to the shaft roller; the inner ring of the first bearing abuts against the first step on the side face near the main body, and the inner ring of the first bearing abuts against the fastener on the side face away from the main body, so that the inner ring of the first bearing is fixedly connected to the shaft roller, thereby allowing the first step and the fastener to limit the axial displacement of the first bearing.

[0007] Optionally, the outer ring of the first bearing is interference-fitted with the housing, or the outer ring of the first bearing is fixedly connected to the housing by adhesive.

[0008] Optionally, the housing has a housing step, and one end face of the outer ring of the first bearing abuts against the housing step.

[0009] Optionally, the shaft has a first threaded section, and the fastener has a second threaded section, with the first threaded section and the second threaded section being threadedly connected.

[0010] Optionally, the shaft includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. The cross-sectional dimension of the second connecting segment is smaller than that of the first connecting segment. A first step is formed between the first connecting segment and the second connecting segment. The first bearing is disposed outside the second connecting segment. The third connecting segment has the first threaded segment.

[0011] Optionally, the cross-sectional dimension of the third connecting segment is smaller than that of the second connecting segment.

[0012] Optionally, the number of the first bearings is at least two, and the at least two first bearings are distributed along the axial direction of the shaft.

[0013] Optionally, the one-way rotation clutch structure includes a movable one-way tooth, an elastic element, and a relatively fixed one-way tooth. One of the main body and the outer shell is provided with a receiving groove, and the other of the main body and the outer shell is provided with a relatively fixed one-way tooth. The movable one-way tooth is movably located in the receiving groove through the elastic element. The relatively fixed one-way tooth forms a one-way groove.

[0014] When the outer shell rotates along the first direction, the movable one-way tooth abuts against the groove wall of the one-way groove, and the outer shell drives the main body to rotate; when the outer shell rotates along the second direction, the movable one-way tooth disengages from the groove wall of the one-way groove, and the outer shell and the main body rotate relative to each other; the second direction is opposite to the first direction.

[0015] Optionally, the movable one-way tooth includes an arc-shaped portion and a connecting portion connected to each other, the arc-shaped portion being circular arc-shaped and rotatably located within a receiving groove;

[0016] One of the main body and the outer shell has a mounting groove, which is disposed opposite to the receiving groove; the elastic member includes a protruding part and a mounting part connected to each other, the mounting part is located in the mounting groove, the protruding part extends out of the mounting groove, and the protruding part contacts the connecting part.

[0017] Optionally, one end of the elastic element is directly or indirectly fixed to the outer shell, and the other end of the elastic element abuts against the movable one-way tooth; the outer surface of the movable one-way tooth is provided with an anti-rotation part extending along the axial direction of the shaft, and the outer shell is provided with an anti-rotation groove that cooperates with the anti-rotation part; the anti-rotation part can move relative to the groove wall of the anti-rotation groove along the axial direction of the shaft, and the outer shell and the movable one-way tooth rotate synchronously through the anti-rotation part.

[0018] Optionally, the main body includes a load output section, a transition section, and a one-way fixing section connected in sequence, wherein the one-way fixing section is used to connect with the one-way rotation clutch structure.

[0019] Optionally, the tower base structure further includes a torque sensing component located in the transition section; and / or, the tower base structure further includes a speed sensor, the speed sensor including a speed sensing circuit portion and a speed-sensing rotation portion, the speed sensing circuit portion being located in the transition section and the speed-sensing rotation portion being disposed within the housing.

[0020] Optionally, the tower base structure further includes a primary side control circuit, a secondary side control circuit, and a sensor housing. The primary side control circuit provides power to the secondary side control circuit via radio, and the secondary side control circuit transmits torque signals and / or speed signals to the primary side control circuit via radio or infrared. The primary side control circuit is fixed inside the sensor housing, which is sleeved outside the shaft and located on the side of the main body away from the outer shell. The main body can rotate relative to the sensor housing. The secondary side control circuit is electrically connected to the torque sensing component, and / or, the secondary side control circuit is partially electrically connected to the speed sensing circuit.

[0021] Optionally, the sensor housing is snapped into the main body, and the main body is rotatable relative to the sensor housing; or, the sensor housing has a housing portion and a sleeve portion connected together, the inner ring of the second bearing abuts against the housing portion on the side away from the outer shell, and the sleeve portion is located between the shaft and the inner ring of the second bearing.

[0022] Optionally, the shaft includes a bushing and a shaft body. The bushing is sleeved on the shaft body. A first step is formed between the end face of one end of the bushing and the shaft body. The end face of the inner ring of the first bearing near the main body abuts against the first step. A third step is formed between the end face of the other end of the bushing and the shaft body. The end face of the inner ring of the second bearing near the outer shell abuts against the third step.

[0023] In addition, this utility model also provides an electric bicycle, which includes the tower base structure as described above.

[0024] In this utility model, the inner ring of the first bearing abuts against the first step on the side closest to the main body, and the first step restricts the inner ring of the first bearing from moving to the left. The inner ring of the first bearing abuts against a fastener on the side furthest from the main body, and the fastener restricts the inner ring of the first bearing from moving to the right. The fastener engages with the first step to fix the inner ring of the first bearing to the shaft. A right-to-left compressive force is applied to the inner ring of the first bearing by the fastener, thus fixing the inner ring of the first bearing to the shaft. The inner ring of the first bearing and the outer surface of the shaft are connected by a sliding fit, thereby improving the operability of the electric bicycle. Furthermore, the main body assembly and the outer shell assembly in this application are separable, and the main body assembly and the outer shell assembly can be replaced individually, making the main body assembly and the outer shell assembly more flexible in use and reducing the after-sales cost of the tower base structure. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic cross-sectional view of an existing tower base structure;

[0027] Figure 2 This is a diagram showing the usage status of the tower base structure;

[0028] Figure 3 for Figure 2 An exploded view of the assembly;

[0029] Figure 4 This is a cross-sectional schematic diagram of a tower base structure provided in an embodiment of this application;

[0030] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0031] Figure 6 This is an exploded view of the assembly of a tower base structure according to an embodiment of this application;

[0032] Figure 7 for Figure 6 Exploded view of the inner and outer shell components;

[0033] Figure 8 A schematic diagram of the shaft roller that mates with the tower base structure, provided in an embodiment of this application;

[0034] Figure 9 This is an exploded view of a one-way rotating clutch structure in a tower base structure provided in an embodiment of this application;

[0035] Figure 10 for Figure 9 Another structural diagram of the housing assembly;

[0036] Figure 11 for Figure 9 A schematic diagram showing the state of the outer shell rotating in the first direction;

[0037] Figure 12 for Figure 9 A schematic diagram showing the state of the outer shell rotating in the second direction;

[0038] Figure 13 An exploded view of a one-way rotating clutch structure in a tower base structure provided in another embodiment of this application;

[0039] Figure 14 for Figure 13 Another perspective view of the outer shell;

[0040] Figure 15 for Figure 13 A cross-sectional view of the shaft roller from one perspective;

[0041] Figure 16 for Figure 13 A cross-sectional view from another perspective;

[0042] Figure 17 This is a cross-sectional schematic diagram of a tower base structure provided in another embodiment of this application;

[0043] Figure 18 for Figure 17 Enlarged view of point B in the middle;

[0044] Figure 19 A cross-sectional schematic diagram of a tower base structure provided in another embodiment of this application;

[0045] Figure 20 for Figure 19 Enlarged diagram of point C in the middle.

[0046] Explanation of icon numbers:

[0047] Reference Name Reference Name 100 Tower base structure 57 Second buckle 10 Shell 60 One-way rotation clutch structure 11 Shell step 61 Movable one-way tooth 12 Rotation stopping groove 611 Arc-shaped part 20 Shaft stick 612 Connecting part 21 First step 613 Rotation stopping part 22 First threaded segment 62 Elastic member 23 First connecting segment 621 Protruding part 24 Second connecting segment 622 Mounting part 25 Third connecting segment 63 Opposite fixed one-way tooth 26 Fourth connecting segment 631 One-way groove 27 Second step 64 Fixed sheet 28 Shaft sleeve 70 Second bearing 281 Third step 81 Inner gasket 29 Stick body 82 Outer gasket 30 First bearing 90 Speed sensing rotating part 31 Inner ring 101 Shell assembly 32 Outer ring 102 Main body assembly 40 Fastener 103 Sensor shell 41 Second threaded segment 1031 First buckle 50 Main body 1032 Shell part 51 Accommodating groove 1033 Sleeved part 52 Mounting groove 104 Secondary side control circuit 53 Fixing groove 105 Primary side control circuit 54 One-way fixing part 200 Flywheel 55 Load output part 300 Connecting bearing 56 Transition part 400 Shell bearing

[0048] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0051] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0054] In this utility model, the descriptions of directions such as "up", "down", "front", "back", "left", and "right" are as follows: Figure 1 The directions shown are for reference only and are used to interpret the location. Figure 1 The relative positional relationship between the components in the shown posture is such that if the specific posture changes, the directional indication will also change accordingly.

[0055] This utility model provides a tower base structure 100 and an electric bicycle.

[0056] For ease of description, features representing space, such as slots, holes, and cavities, are labeled with arrowed leader lines in the accompanying drawings, while solid structural features are labeled with un-arrowed leader lines in the accompanying drawings.

[0057] To better illustrate the technical solution of this application, relevant technical solutions of existing products are introduced for explanation. Figure 1 These are all schematic diagrams related to existing tower base structures. Figure 1 This is a schematic cross-sectional view of an existing tower base structure 100. Figure 2 This is a diagram showing the usage status of the tower base structure 100. Figure 3 for Figure 2 An exploded view of the assembly. In the existing tower base structure 100, the tower base structure 100 includes a shell 10, a main body 50, a second bearing 70, a connecting bearing 300, and a shell bearing 400. The shaft 20 extends in the left-right direction. The main body 50 is located outside the shaft 20 and is used to connect with the rear wheel hub or rear drive hub motor of an electric bicycle. The second bearing 70 is located inside the main body 50, and the outer ring of the second bearing 70 is fixedly connected to the main body 50 with an interference fit. The second bearing 70 is located outside the shaft 20, and the inner ring of the second bearing 70 is directly or indirectly connected to the shaft 20. The shell 10 is located outside the main body 50, and the outer surface of the shell 10 is connected to the flywheel 200 (the flywheel 200 is used to cooperate with a chain or belt to realize power transmission). The shell bearing 400 is located outside the shaft 20, the inner ring of the shell bearing 400 is clearance-fitted with the shaft 20, and the outer ring of the shell bearing 400 is interference-fitted with the shell 10. The inner ring of the connecting bearing 300 is interference-fitted with the main body 50, and the outer ring of the connecting bearing 300 is interference-fitted with the outer shell 10. Therefore, the connecting bearing 300 connects the main body 50 and the outer shell 10 together. When replacing, the main body 50 and the outer shell 10 can only be replaced together and cannot be replaced separately.

[0058] like Figure 1 As shown, in the existing freewheel base structure 100, since the inner ring of the connecting bearing 300 is interference-fitted with the main body 50 and the outer ring of the connecting bearing 300 is interference-fitted with the outer shell 10, when the axle 20 bends and deforms, the bending deformation of the axle 20 will cause uneven loads between the inner and outer rings of the connecting bearing 300 at different rotation angles through the outer shell bearing 400 and the second bearing 70, generating a pulling force, increasing the frictional resistance between the inner and outer rings of the connecting bearing 300, causing the connecting bearing 300 to be easily damaged, hindering the rotation of the outer shell 10, and thus hindering the rotation of the freewheel 200. At this time, if the rear wheel rotates during riding, it drives the lower chain to rotate through the main body 50 and the outer shell 10 (if the foot stops pedaling or rotates in the opposite direction during pedaling), causing the upper chain to sag too much, or even the derailleur to malfunction, seriously affecting normal riding. In more serious cases, the chain may get stuck in the freewheel 200 teeth and the frame, making the whole bike impossible to push.

[0059] To address the issues mentioned above, where the main body 50 and outer casing 10 can only be replaced together and not separately, and where the connecting bearing 300 is easily damaged, this application provides a tower base structure 100. Please refer to... Figures 4 to 8 , Figure 4 This is a cross-sectional schematic diagram of a tower base structure 100 provided in one embodiment of this application. Figure 5 for Figure 4 Enlarged diagram of point A in the middle. Figure 6 This is an exploded view of the assembly of a tower base structure 100 according to an embodiment of this application. Figure 7 for Figure 6 Exploded view of the inner outer casing assembly 101. Figure 8 This is a schematic diagram of the shaft 20 that mates with the tower base structure 100, as provided in an embodiment of this application.

[0060] The tower base structure 100 includes an outer shell assembly 101, a main body assembly 102, fasteners 40, and a one-way rotating clutch structure 60 (see...). Figures 9 to 16 The outer casing assembly 101 includes an outer casing 10 and a first bearing 30. The main body assembly 102 includes a main body 50 and a second bearing 70. The outer ring of the main body 50 and the second bearing 70 are fixedly connected with each other by an interference fit. The main body 50 is rotatably mounted outside the shaft 20 via the second bearing 70. The inner ring of the second bearing 70 is directly or indirectly connected to the shaft 20 (for example, the inner ring of the second bearing 70 is indirectly connected to a bushing outside the shaft 20). The main body 50 can rotate relative to the shaft 20, and the main body 50 is rotatably connected to the shaft 20 directly or indirectly via the second bearing 70. By providing the second bearing 70 to support the main body 50, the coefficient of friction during the rotation of the main body 50 is reduced. The main body 50 and the outer casing 10 can be freely detached and connected via a one-way rotational clutch structure 60.

[0061] At least one first bearing 30 is provided between the outer casing 10 and the shaft 20. The outer ring 32 of the first bearing 30 is fixedly connected to the outer casing 10 and rotates together with the outer casing 10. The shaft 20 has a first step 21. Fasteners 40 are provided outside the shaft 20 and are detachably connected to the shaft 20.

[0062] The inner ring 31 of the first bearing 30, near the main body 50 (left end face), abuts against the first step 21, which restricts the inner ring 31 of the first bearing 30 from moving to the left. The inner ring 31 of the first bearing 30, away from the main body 50 (right end face), abuts against the fastener 40, which restricts the inner ring 31 of the first bearing 30 from moving to the right. The fastener 40 cooperates with the first step 21 to fix the inner ring 31 of the first bearing 30 to the shaft 20, thereby restricting the axial displacement of the first bearing 30. A right-to-left compressive force is applied to the inner ring 31 of the first bearing 30 by the fastener 40, fixing the inner ring 31 of the first bearing 30 to the shaft 20. The inner ring 31 of the first bearing 30 and the outer surface of the shaft 20 are connected by a clearance sliding fit, thereby improving the operability of the electric bicycle.

[0063] In addition, such as Figure 1 As shown, when disassembling the existing tower base structure 100, because the inner ring of the connecting bearing 300 is interference-fitted with the main body 50, and the outer ring of the connecting bearing 300 is also interference-fitted with the outer shell 10, and the main body 50 is fixed to the motor or rear wheel hub, once the main body 50 is fixed, the outer shell 10 and the outer shell bearing 400 are difficult to remove from the main body 50. Furthermore, the connecting bearing 300 connects the main body 50 and the outer shell 10 together, meaning that the main body 50 and the outer shell 10 can only be replaced together, not separately, increasing the after-sales cost of the tower base structure 100.

[0064] Please refer to the following: Figures 4 to 6 In this application, the inner ring 31 of the first bearing 30 is fixedly connected to the shaft 20 by fasteners 40, which facilitates the replacement of easily damaged parts of the tower base structure 100 (such as the outer shell 10 and the first bearing 30), making the installation and disassembly of the outer shell assembly 101 of the tower base structure 100 more convenient and improving the flexibility of the tower base structure 100. When disassembling the outer shell assembly 101 of the tower base structure 100 in this application, the fasteners 40 are removed from the shaft 20, and then the outer shell assembly 101 with the first bearing 30 assembled is removed from the shaft 20. In this way, the main body assembly 102 and the outer shell assembly 101 are separated. At this time, the easily damaged parts (movable one-way gear 61, elastic element 62) can also be cleaned, maintained, or even replaced and repaired. During installation, the manufacturer can first assemble and fix the main body component 102 onto the rear wheel hub or hub motor, and then slide the housing component 101 with the first bearing 30 assembled onto the axle roller 20 so that the left end of the first bearing 30 abuts against the first step 21. After the housing component 101 and the main body component 102 are assembled, the fastener 40 is installed onto the axle roller 20 so that the fastener 40 abuts against the right end of the first bearing 30.

[0065] Alternatively, the main body component 102 and the outer shell component 101 can be assembled to form a semi-finished product. Then, the semi-finished product can be slidably assembled onto the shaft roller 20 so that the left end of the first bearing 30 abuts against the first step 21. Then, the main body 50 can be fixed to the motor or the rear wheel hub. Finally, the fastener 40 can be installed onto the shaft roller 20 so that the fastener 40 abuts against the right end of the first bearing 30.

[0066] In other words, the main body component 102 and the outer shell component 101 in this application can be separated, and the main body component 102 and the outer shell component 101 can be replaced individually, which makes the main body component 102 and the outer shell component 101 more flexible in use and reduces the after-sales cost of the tower base structure 100.

[0067] As can be understood from the above, the main body assembly 102 and the outer shell assembly 101 are connected by a movable one-way rotating clutch structure 60. When the shaft 20 undergoes axial bending deformation, the movable one-way rotating clutch structure 60 can completely absorb the bending deformation of the shaft 20. The main body assembly 102 has its own independent bearing, namely the second bearing 70, and the outer shell assembly 101 also has its own independent bearing, namely the first bearing 30. The rotational connection between the main body assembly 102 and the outer shell assembly 101 is the one-way rotating clutch structure 60. The one-way rotating clutch structure 60 has a large range of motion and is completely unaffected by the slight axial deformation of the shaft 20.

[0068] It is understood that the fastener 40 can be a nut, washer, snap ring or other structure. The fastener 40 is detachably connected to the shaft 20, and the fastener 40 can abut against the end face of the inner ring 31 of the first bearing 30 away from the main body 50.

[0069] In one embodiment, the outer ring 32 of the first bearing 30 is interference-fitted with the housing 10 to achieve a fixed connection between the outer ring 32 of the first bearing 30 and the housing 10. The interference fit connection has advantages such as good centering, large load-bearing capacity, and small reduction in shaft strength.

[0070] In another embodiment, the outer ring 32 of the first bearing 30 is fixedly connected to the outer casing 10 by adhesive (not shown in the figure). The adhesive can be epoxy adhesive, acrylic adhesive, etc., as long as the adhesive can firmly bond the outer ring 32 of the first bearing 30 to the outer casing 10. This application does not limit the specific type of adhesive.

[0071] In one embodiment, the housing 10 has a housing step 11, and one end face (left end face) of the outer ring 32 of the first bearing 30 abuts against the housing step 11. The housing step 11 is used to restrict the outer ring 32 of the first bearing 30 from moving to the left. The housing step 11 can also be used to position the first bearing 30 when it is installed into the housing 10, thereby improving the assembly efficiency of the first bearing 30 and the housing 10.

[0072] In one embodiment, the shaft 20 has a first threaded section 22, and the fastener 40 has a second threaded section 41. The first threaded section 22 and the second threaded section 41 are threadedly connected. This threaded connection allows for a detachable connection between the fastener 40 and the shaft 20, improving the efficiency of fastener 40 installation and removal. Furthermore, the threaded connection is self-locking, making the connection between the fastener 40 and the shaft 20 tighter and more reliable.

[0073] In one embodiment, please refer to Figure 4 and Figure 8 The shaft 20 includes a first connecting segment 23, a second connecting segment 24, and a third connecting segment 25 connected in sequence from left to right.

[0074] The cross-sectional dimension of the second connecting segment 24 is smaller than that of the first connecting segment 23. A first step 21 is formed between the first connecting segment 23 and the second connecting segment 24. The first bearing 30 is located outside the second connecting segment 24. The third connecting segment 25 has a first threaded section 22.

[0075] The cross-sectional dimension of the third connecting segment 25 can be equal to the cross-sectional dimension of the second connecting segment 24.

[0076] Alternatively, the cross-sectional dimension of the third connecting section 25 is smaller than that of the second connecting section 24, so as to avoid interference or obstruction of the process of the first threaded section 22 sliding the first bearing 30 onto the shaft 20, thereby improving assembly efficiency.

[0077] In one embodiment, please refer to Figure 4 and Figure 5 The number of first bearings 30 is at least two, and the at least two first bearings 30 are distributed along the axial direction of the shaft 20. By setting at least two first bearings 30, the sway of the housing 10 is reduced when the flywheel 200 is under different forces, the force on the housing 10 is more uniform, and the service life of the housing 10 and the first bearings 30 is extended. Figure 4 The number of first bearings 30 is two. If the length dimensions of the main body 50 and the outer shell 10 allow, the number of first bearings 30 can be three, four or other numbers.

[0078] Please refer to the following: Figure 4 , Figure 5 and Figure 7An inner shim 81 is provided between the inner rings 31 of the two first bearings 30. The inner shim 81 can maximize the separation distance between the two first bearings 30 along the axial direction of the shaft 20, so as to minimize the wobble of the housing 10 when the flywheel 200 is operating at its maximum speed, and make the force on the housing 10 more even. The inner rings 31 of the two first bearings 30 abut against the inner shim 81 respectively. By setting the inner shim 81, the axial distance between the inner rings 31 of the two first bearings 30 is fixed. This can prevent the inner rings 31 of the first bearings 30 from being affected by the axial force of the fastener 40 and failing to work properly. Compared with the two first bearings 30 abutting against each other, this can further make the force on the housing 10 more even when the leftmost flywheel 200 is working.

[0079] Furthermore, an outer washer 82 is provided between the outer rings 32 of the two first bearings 30, and an inner washer 81 is located inside the outer washer 82. The axial dimensions of the inner washer 81 and the outer washer 82 are as similar as possible. This way, when the outer rings 32 of the two first bearings 30 are tightly fitted into the housing 10, the axial force on the outer rings 32 and inner rings 31 of the first bearings 30 is avoided, thus preventing damage to the first bearings 30.

[0080] At this time, the housing assembly 101 includes a housing 10, a first bearing 30, an inner gasket 81, and an outer gasket 82.

[0081] It is understandable that the first bearing 30 can be a ball bearing or other type of bearing. The dimensions of the two first bearings 30 along the axial direction of the shaft 20 can be the same or different, and can be flexibly adjusted according to the actual situation.

[0082] In other embodiments, the two first bearings 30 may directly abut against each other or be a double-row bearing (a type of rolling bearing characterized by having two rows of rolling elements along the circumference).

[0083] The shaft roller 20 also includes a fourth connecting section 26 ( Figure 4 The first connecting segment 23, the second connecting segment 24, the third connecting segment 25, and the fourth connecting segment 26 are divided by dashed lines. The fourth connecting segment 26 connects to the first connecting segment 23. The cross-sectional dimension of the first connecting segment 23 is smaller than that of the fourth connecting segment 26. A second step 27 is formed between the fourth connecting segment 26 and the first connecting segment 23. The inner ring of the second bearing 70 directly or indirectly abuts against the second step 27. The second step 27 is used to restrict the leftward movement of the inner ring of the second bearing 70. The second step 27 can also be used for positioning when the second bearing 70 is installed on the shaft 20, thereby improving the assembly efficiency of the second bearing 70 and the shaft 20.

[0084] It is understandable that the first connecting segment 23, the second connecting segment 24, the third connecting segment 25 and the fourth connecting segment 26 can be integrally molded parts, saving assembly steps.

[0085] In one embodiment, please refer to Figures 9 to 12 , Figure 9 This is an exploded view of the one-way rotating clutch structure 60 in the tower base structure 100 provided in an embodiment of this application. Figure 10 for Figure 9 Another structural schematic diagram of the housing assembly 101. Figure 11 for Figure 9 A schematic diagram of the outer casing 10 rotating in the first direction. Figure 12 for Figure 9 A schematic diagram of the outer shell 10 rotating in the second direction. Figure 11 and Figure 13 The direction of rotation is indicated by a dashed line with an arrowhead.

[0086] The one-way rotary clutch structure 60 includes a movable one-way tooth 61, an elastic element 62, and a relatively fixed one-way tooth 63. One of the main body 50 and the outer shell 10 has a receiving groove 51, and the other of the main body 50 and the outer shell 10 has a relatively fixed one-way tooth 63. In this embodiment, the main body 50 has a receiving groove 51, and the outer shell 10 has a relatively fixed one-way tooth 63 as an example. It is understood that in other embodiments, the structure can be changed, with the outer shell 10 having a receiving groove 51 and the main body 50 having a relatively fixed one-way tooth 63.

[0087] The main body 50 has a receiving groove 51. The movable one-way tooth 61 is movably located in the receiving groove 51 through the elastic member 62. The movable one-way tooth 61 can rotate along the inner circumference of the receiving groove 51. The relatively fixed one-way tooth 63 is located on the inner surface of the outer shell 10, and a one-way groove 631 is formed on the relatively fixed one-way tooth 63.

[0088] like Figure 11 As shown, when the foot pedal applies a positive torque to the housing 10, the housing 10 moves along the first direction (the first direction is...). Figure 11 When the outer shell 10 rotates clockwise, the movable one-way tooth 61 abuts against the groove wall of the one-way groove 631, and the outer shell 10 drives the main body 50 to rotate through the movable one-way tooth 61. At this time, the outer shell 10 and the main body 50 keep running synchronously, that is, the outer shell 10 and the main body 50 are relatively stationary.

[0089] like Figure 12 As shown, when the foot pedal applies a reverse torque to the housing 10, the housing 10 moves along the second direction (the second direction is...). Figure 12 The first direction is opposite to the second direction (counterclockwise). The movable one-way tooth 61 disengages from the groove wall of the one-way groove 631, and the outer shell 10 and the main body 50 rotate relative to each other.

[0090] The movable one-way tooth 61 includes a connected arc-shaped portion 611 and a connecting portion 612. The arc-shaped portion 611 is rotatably located within the receiving groove 51. The main body 50 has a mounting groove 52 (when the outer shell 10 has a receiving groove 51, the outer shell 10 also has a mounting groove 52, and the position of the mounting groove 52 is adjusted to adapt to the position of the receiving groove 51). The mounting groove 52 is arranged opposite to the receiving groove 51. The elastic member 62 includes a connected protrusion 621 and a mounting portion 622. The mounting portion 622 is located within the mounting groove 52, and the protrusion 621 protrudes out of the mounting groove 52 and contacts the connecting portion 612.

[0091] like Figure 11 As shown, when the foot pedal applies a positive torque to the outer casing 10, the outer casing 10 rotates in the first direction (i.e., clockwise direction), the connecting part 612 of the movable one-way tooth 61 abuts against the groove wall of the one-way groove 631, and the outer casing 10 drives the main body 50 to rotate. At this time, the outer casing 10 and the main body 50 keep running synchronously, that is, the outer casing 10 and the main body 50 are relatively stationary.

[0092] like Figure 12 As shown, when the foot pedal applies a reverse torque to the outer casing 10, the outer casing 10 rotates in the second direction (i.e., counterclockwise direction), the arc-shaped part 611 rotates relative to the receiving groove 51, the connecting part 612 causes the protruding part 621 of the elastic member 62 to deform inward, the connecting part 612 gradually separates from the groove wall of the one-way groove 631, and the outer casing 10 and the main body 50 rotate relative to each other.

[0093] Understandable, Figures 9 to 12 In this configuration, the relatively fixed one-way gear 63 and the outer shell 10 can be integrally formed, saving assembly steps. Alternatively, the relatively fixed one-way gear 63 and the outer shell 10 can be separate components.

[0094] The main body 50 includes a load output section 55 and a one-way fixing section 54. The one-way fixing section 54 is provided with a receiving groove 51 and a mounting groove 52.

[0095] The one-way rotary clutch structure 60 also includes a fixing plate 64, and the one-way fixing part 54 is also provided with a fixing groove 53. The fixing plate 64 is located in the fixing groove 53. The fixing plate 64 is used to restrict the rightward movement of the movable one-way tooth 61 and the elastic member 62, ensuring that the movable one-way tooth 61 is in the receiving groove 51 and that the elastic member 62 is in the mounting groove 52.

[0096] In other embodiments, the elastic element 62 may also be a wire spring or other elastic element.

[0097] Please refer to the following: Figures 13 to 16 , Figures 13 to 16 It is another type of one-way rotating clutch structure 60. Figure 13An exploded view of the one-way rotating clutch structure 60 in the tower base structure 100 provided in another embodiment of this application; Figure 14 for Figure 13 Another perspective view of the outer casing 10; Figure 15 for Figure 13 A cross-sectional view of the shaft roller from one perspective; Figure 16 for Figure 13 A cross-sectional view from another perspective.

[0098] In this embodiment, the outer shell 10 has a receiving groove 51 and the main body 50 has a relatively fixed one-way tooth 63 as an example for explanation. It can be understood that in other embodiments, the structure can be changed, with the main body 50 having a receiving groove 51 and the outer shell 10 having a relatively fixed one-way tooth 63.

[0099] The receiving groove 51 extends axially along the shaft 20. The elastic element 62 is a spring, which has the advantages of easy material availability and convenient installation. One end of the elastic element 62 is directly or indirectly fixed to the outer casing 10. The elastic element 62 can be directly abutted against the outer casing 10 to achieve the limiting and fixing. Figure 15 As shown, the elastic element 62 can also abut against the first bearing 30 to achieve limiting and fixing, thereby indirectly limiting and fixing the elastic element 62 to the outer casing 10. The other end of the elastic element 62 abuts against the movable one-way tooth 61.

[0100] The outer surface of the movable one-way gear 61 is provided with an anti-rotation part 613, which extends along the axial direction of the shaft 20. The housing 10 is provided with an anti-rotation groove 12 that mates with the anti-rotation part 613. The anti-rotation groove 12 is located on the groove wall of the receiving groove 51 and extends along the axial direction of the shaft 20. The anti-rotation part 613 can move relative to the groove wall of the anti-rotation groove 12 along the axial direction of the shaft 20, and the housing 10 and the movable one-way gear 61 rotate synchronously through the anti-rotation part 613.

[0101] When the foot pedal applies a positive torque to the outer casing 10, the outer casing 10 rotates in the first direction and drives the movable one-way tooth 61 to rotate synchronously. The movable one-way tooth 61 abuts against the groove wall of the one-way groove 631, and the movable one-way tooth 61 drives the main body 50 to rotate. At this time, the outer casing 10 and the main body 50 keep running synchronously, that is, the outer casing 10 and the main body 50 are relatively stationary.

[0102] When the foot pedal applies a reverse torque to the outer casing 10, the outer casing 10 rotates in the second direction and drives the movable one-way tooth 61 to rotate synchronously. The movable one-way tooth 61 gradually disengages from the groove wall of the one-way groove 631. The anti-rotation part 613 moves axially along the shaft 20 relative to the groove wall of the anti-rotation groove 12. The movable one-way tooth 61 causes the elastic element 62 to be compressed and deformed, and the outer casing 10 and the main body 50 rotate relative to each other.

[0103] It is understandable that there are multiple movable one-way teeth 61 and one-way grooves 631, which are distributed circumferentially along the shaft 20. The relatively fixed one-way tooth 63 and the main body 50 can be integrally formed, saving the installation steps between the relatively fixed one-way tooth 63 and the main body 50. Alternatively, the relatively fixed one-way tooth 63 and the main body 50 can be separate parts.

[0104] Alternatively, the one-way rotary clutch structure 60 may also include a one-way clutch structure, such as a one-way bearing connected between the housing 10 and the main body 50.

[0105] Understandably, during assembly, the elastic element 62 and the movable one-way tooth 61 will be installed or removed together with the housing assembly 101.

[0106] In some embodiments, please refer to Figure 9 The tower base structure 100 also includes a torque sensing component (not shown), which is mounted on the main body 50. The torque sensing component is used to measure torque. A transition section 56 is provided between the load output section 55 and the one-way fixing section 54. The torque sensing component is mounted on the transition section 56. When the housing 10 is subjected to rotational torque, it is transmitted sequentially to the one-way fixing section 54, the transition section 56, and the load output section 55 of the main body 50 through the one-way rotational clutch structure 60. The torque sensing component (in this solution, a resistance strain gauge) is fixed on the transition section 56 to sense the magnitude of the torque transmitted from the housing 10. Compared to other locations, the measurement results obtained by placing the torque sensing component on the transition section 56 are more accurate.

[0107] In some embodiments, please refer to Figure 4 , Figure 7 and Figure 13 The tower base structure 100 also includes a speed sensor, which comprises a speed sensing circuit and a speed-sensing rotating part 90. The speed sensing circuit is disposed on the main body 50. In this embodiment, the speed sensing circuit is disposed at the transition section 56 of the main body 50, and the speed-sensing rotating part 90 is disposed within the outer casing 10. Figure 10 and Figure 14 The speed-sensing rotating part 90 is fixedly connected to the inner surface of the housing 10 by adhesive. When the housing 10 is removed for replacement, the speed-sensing rotating part 90 is removed together with the housing 10.

[0108] The speed-sensing rotating part 90 can be made of ferromagnetic material, specifically a magnetic ring with several N and S magnetic poles on its inner diameter. The speed sensing circuit is a Hall element. By measuring the change in magnetic flux of the speed-sensing rotating part 90, the reverse speed of the outer shell 10 is sensed. Combined with the speed data of the whole vehicle, the cadence (the speed and direction of pedaling) data can be accurately calculated. Combined with its torque data, the whole vehicle speed data, etc., the data is given to the whole vehicle control system. Based on the various riding perception data provided by these sensors, the system can better control the torque and speed of the motor to meet the changing intelligent riding comfort, that is, the so-called riding feeling of man and machine as one.

[0109] In some embodiments, please refer to Figure 17 and Figure 18 , Figure 17 A cross-sectional schematic diagram of a tower base structure 100 provided in another embodiment of this application; Figure 18 for Figure 17 Enlarged schematic diagram at point B. The tower base structure 100 also includes a primary control circuit 105, a secondary control circuit 104, and a sensor housing 103. The primary control circuit 105 provides power to the secondary control circuit 104 via radio, and the secondary control circuit 104 transmits torque signals and / or speed signals to the primary control circuit 105 via radio or infrared. The primary control circuit 105 is fixed inside the sensor housing 103, which is sleeved on the outside of the shaft 20 and located on the side of the main body 50 away from the outer shell 10. The main body 50 can rotate relative to the sensor housing 103.

[0110] The secondary control circuit 104 is electrically connected to the torque sensing component. The data sensed by the torque sensing component is transmitted to the secondary control circuit 104. The secondary control circuit 104 transmits the signal to the primary control circuit 105 via radio or infrared. The primary control circuit 105 performs digital processing and then outputs the data through the data output line.

[0111] The secondary control circuit 104 is electrically connected to the speed sensing circuit. The data sensed by the speed sensing circuit is transmitted to the secondary control circuit 104. The secondary control circuit 104 transmits the signal to the primary control circuit 105 via radio or infrared. The primary control circuit 105 performs digital processing and then outputs the data through the data output line.

[0112] Furthermore, the primary control circuit 105 provides power to the secondary control circuit 104 via radio.

[0113] The sensor housing 103 is snapped into the main body 50, and the main body 50 can rotate relative to the sensor housing 103. Specifically, the sensor housing 103 has a first latch 1031, and the main body 50 has a second latch 57. The first latch 1031 and the second latch 57 are snapped into each other. Through the cooperation of the first latch 1031 and the second latch 57, the main body 50 can rotate relative to the sensor housing 103, and the distance between the sensor housing 103 and the main body 50 along the axial direction of the shaft 20 can be maintained within a certain range, so as to avoid the signal transmission reliability being reduced due to a large distance between the sensor housing 103 and the main body 50 along the axial direction of the shaft 20.

[0114] Alternatively, please refer to the following: Figure 19 and Figure 20 , Figure 19 This is a cross-sectional schematic diagram of a tower base structure 100 provided in another embodiment of this application. Figure 20 for Figure 19 Enlarged view at point C. The sensor housing 103 has a housing portion 1032 and a sleeve portion 1033 connected together. The inner ring of the second bearing 70 abuts against the housing portion 1032 on the side away from the outer housing 10, so that the distance between the sensor housing 103 and the main body 50 along the axial direction of the shaft 20 can be maintained within a certain range, avoiding a decrease in signal transmission reliability due to a large distance between the sensor housing 103 and the main body 50 along the axial direction of the shaft 20. The sleeve portion 1033 is located between the shaft 20 and the inner ring of the second bearing 70, and the main body 50 can rotate relative to the sensor housing 103 through the second bearing 70.

[0115] The sleeve portion 1033 has a limiting protrusion 1034, and the inner ring of the second bearing 70 is located between the housing portion 1032 and the limiting protrusion 1034. The housing portion 1032 abuts against the left end face of the inner ring of the second bearing 70, restricting the housing portion 1032 from moving to the right. The limiting protrusion 1034 abuts against the right end face of the inner ring of the second bearing 70, restricting the housing portion 1032 from moving to the left, so that the distance between the sensor housing 103 and the main body 50 along the axial direction of the shaft 20 can be maintained within a certain range.

[0116] Specifically, since the thickness of the sleeve portion 1033 is relatively thin, the sleeve portion 1033 can have a certain amount of deformation. By squeezing the sleeve portion 1033, the inner ring of the second bearing 70 is positioned between the housing portion 1032 and the limiting protrusion 1034. Then, the sensor housing 103 with the second bearing 70 assembled is installed on the shaft roller 20. The shaft roller 20 reduces the deformation space of the sleeve portion 1033, so that the limiting protrusion 1034 cannot detach from the second bearing 70, thus restricting the housing portion 1032 from moving to the left.

[0117] In some embodiments, please refer to Figure 17 and Figure 18The roller 20 includes a bushing 28 and a roller body 29. The bushing 28 is fitted over the roller body 29. A first step 21 is formed between the end face (right end face) of one end of the bushing 28 and the roller body 29. The end face of the inner ring of the first bearing 30 near the main body 50 abuts against the first step 21. The first step 21 is used to restrict the first bearing 30 from moving to the left. A third step 281 is formed between the end face (left end face) of the other end of the bushing 28 and the roller body 29. The end face of the inner ring of the second bearing 70 near the outer shell 10 abuts against the third step 281. The third step 281 is used to restrict the second bearing 70 from moving to the right.

[0118] The rod body 29 has a second step 27. The inner ring of the second bearing 70 abuts against the second step 27 on the side away from the outer casing 10. The second step 27 is used to restrict the second bearing 70 from moving to the left.

[0119] The bushing 28 can be fixedly connected to the rod body 29, or the bushing 28 can be connected to the rod body 29 through a sliding gap.

[0120] In addition, this utility model also provides an electric bicycle, including the tower base structure 100 as described above. The specific structure of the tower base structure 100 is as described in the above embodiments. Since the electric bicycle adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0121] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A tower base structure, characterized in that, The tower base structure includes an outer shell assembly, a main body assembly, fasteners, and a one-way rotating clutch structure. The outer shell assembly includes an outer shell and a first bearing. The main body assembly includes a main body and a second bearing. The main body is fixedly connected to the outer ring of the second bearing. The main body is rotatably mounted outside the shaft roller via the second bearing. The main body and the outer shell are freely detachable and connected via the one-way rotating clutch structure. At least one first bearing is provided between the outer shell and the shaft, and the outer ring of the first bearing is fixedly connected to the outer shell; The shaft roller is provided with a first step; the fastener is located outside the shaft roller and is detachably connected to the shaft roller; the inner ring of the first bearing abuts against the first step on the side face near the main body, and the inner ring of the first bearing abuts against the fastener on the side face away from the main body, so that the inner ring of the first bearing is fixedly connected to the shaft roller, thereby allowing the first step and the fastener to limit the axial displacement of the first bearing.

2. The tower base structure as described in claim 1, characterized in that, The outer ring of the first bearing is interference-fitted with the housing, or the outer ring of the first bearing is fixedly connected to the housing by adhesive.

3. The tower base structure as described in claim 2, characterized in that, The housing has a housing step, and one end face of the outer ring of the first bearing abuts against the housing step.

4. The tower base structure as described in claim 1, characterized in that, The shaft has a first threaded section, and the fastener has a second threaded section, with the first threaded section and the second threaded section being threadedly connected.

5. The tower base structure as described in claim 4, characterized in that, The shaft includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. The cross-sectional dimension of the second connecting segment is smaller than that of the first connecting segment. A first step is formed between the first connecting segment and the second connecting segment. The first bearing is located outside the second connecting segment. The third connecting segment has the first threaded segment.

6. The tower base structure as described in claim 5, characterized in that, The cross-sectional dimension of the third connecting segment is smaller than that of the second connecting segment.

7. The tower base structure as described in any one of claims 1 to 6, characterized in that, The number of the first bearings is at least two, and the at least two first bearings are distributed along the axial direction of the shaft.

8. The tower base structure as described in any one of claims 1 to 6, characterized in that, The one-way rotation clutch structure includes a movable one-way tooth, an elastic element, and a relatively fixed one-way tooth. One of the main body and the outer shell has a receiving groove, and the other of the main body and the outer shell is provided with a relatively fixed one-way tooth. The movable one-way tooth is movably located in the receiving groove through the elastic element. The relatively fixed one-way tooth forms a one-way groove. When the outer shell rotates in the first direction, the movable one-way tooth abuts against the groove wall of the one-way groove, and the outer shell drives the main body to rotate; When the outer shell rotates in the second direction, the movable one-way tooth disengages from the groove wall of the one-way groove, and the outer shell rotates relative to the main body; The second direction is opposite to the first direction.

9. The tower base structure as described in claim 8, characterized in that, The movable one-way tooth includes an arc-shaped part and a connecting part connected to each other. The arc-shaped part is circular and is rotatably located in the receiving groove. One of the main body and the outer shell has a mounting groove, which is disposed opposite to the receiving groove; the elastic member includes a protruding part and a mounting part connected to each other, the mounting part is located in the mounting groove, the protruding part extends out of the mounting groove, and the protruding part contacts the connecting part.

10. The tower base structure as described in claim 8, characterized in that, One end of the elastic element is directly or indirectly fixed to the outer shell, and the other end of the elastic element abuts against the movable one-way tooth; the outer surface of the movable one-way tooth is provided with an anti-rotation part extending along the axial direction of the shaft, and the outer shell is provided with an anti-rotation groove that cooperates with the anti-rotation part; the anti-rotation part can move relative to the groove wall of the anti-rotation groove along the axial direction of the shaft, and the outer shell and the movable one-way tooth rotate synchronously through the anti-rotation part.

11. The tower base structure as described in any one of claims 1 to 6, characterized in that, The main body includes a load output section, a transition section and a one-way fixing section connected in sequence, and the one-way fixing section is used to connect with the one-way rotation clutch structure.

12. The tower base structure as described in claim 11, characterized in that, The tower base structure also includes a torque sensing component, which is located in the transition section; and / or The tower base structure also includes a speed sensor, which includes a speed sensing circuit and a speed sensing rotation part. The speed sensing circuit is located in the transition section, and the speed sensing rotation part is disposed inside the housing.

13. The tower base structure as described in claim 12, characterized in that, The tower base structure also includes a primary side control circuit, a secondary side control circuit, and a sensor housing. The primary side control circuit provides power to the secondary side control circuit via radio, and the secondary side control circuit transmits torque signals and / or speed signals to the primary side control circuit via radio or infrared. The primary side control circuit is fixed inside the sensor housing, which is sleeved on the outside of the shaft and located on the side of the main body away from the outer shell. The main body can rotate relative to the sensor housing. The secondary control circuit is electrically connected to the torque sensing component, and / or the secondary control circuit is partially electrically connected to the speed sensing circuit.

14. The tower base structure as described in claim 13, characterized in that, The sensor housing is snapped into the main body, and the main body can rotate relative to the sensor housing; or, the sensor housing has a housing part and a sleeve part connected together, the inner ring of the second bearing abuts against the housing part on the side away from the outer shell, and the sleeve part is located between the shaft and the inner ring of the second bearing.

15. The tower base structure as described in any one of claims 1 to 6, characterized in that, The shaft includes a bushing and a shaft body. The bushing is sleeved on the shaft body. A first step is formed between the end face of one end of the bushing and the shaft body. The end face of the inner ring of the first bearing near the main body abuts against the first step. A third step is formed between the end face of the other end of the bushing and the shaft body. The end face of the inner ring of the second bearing near the outer shell abuts against the third step.

16. An electric bicycle, characterized in that, The electric bicycle includes the tower base structure as described in any one of claims 1 to 15.

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