Tower footing structure and electric bicycle

Abstract

The invention 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 are 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, the main body assembly and the shell assembly can be independently replaced, 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] The invention relates to the field of electric bicycles, and in particular to a tower base structure and an electric bicycle. Background Art

[0002] At present, as people continue to put forward higher requirements for smart travel, electric bicycles are increasingly favored by people. The mid-to-high-end electric bicycles have a tower base structure. The tower base structure refers to the part of the axis of the rear wheel of the electric bicycle used to assemble the flywheel. The tower base structure is the core component of the rear wheel of the bicycle. The tower base structure is mainly used to assemble the flywheel and transmission function. As people continue to put forward higher requirements for smart travel, the simplicity of after-sales service (now the labor cost is getting higher and higher) is becoming more and more important. At this stage, most of the tower base structures are a complete structure, and the outer shell that matches the flywheel cannot be disassembled and assembled separately. Especially after long-term use, the parts of the one-way rotating clutch structure cannot be cleaned and maintained separately, and the after-sales cost is very high. At the same time, some existing tower base structures will increase the bearing damping when the shaft stick is bent and deformed, which seriously affects the normal operation and normal riding of the derailleur. Summary of the invention

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

[0004] To achieve the above-mentioned purpose, the tower base structure proposed by the present invention includes a shell assembly, a main body assembly, a fastener and a one-way rotation clutch structure, the shell assembly includes a 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 arranged outside the shaft through the second bearing, and the main body and the shell are freely detachably connected through the one-way rotation clutch structure;

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

[0006] The shaft rod is provided with a first step; the fastener is arranged outside the shaft rod and is detachably connected to the shaft rod; the inner ring of the first bearing is in contact with the first step at the end face close to the main body, and the inner ring of the first bearing is in contact with the fastener at the end face away from the main body, so that the inner ring of the first bearing is fixedly connected to the shaft rod, and the first step and the fastener are used to limit the axial displacement of the first bearing.

[0007] Optionally, the outer ring of the first bearing is interference fit with the outer shell, or the outer ring of the first bearing is fixedly connected to the outer shell by glue.

[0008] Optionally, the housing is formed with a housing step, and an end surface of one side of the outer ring of the first bearing abuts against the housing step.

[0009] Optionally, the shaft rod is formed with a first threaded segment, the fastener is formed with a second threaded segment, and the first threaded segment is threadedly connected to the second threaded segment.

[0010] Optionally, the shaft rod includes a first connecting section, a second connecting section and a third connecting section connected in sequence, the cross-sectional size of the second connecting section is smaller than the cross-sectional size of the first connecting section, the first step is formed between the first connecting section and the second connecting section, the first bearing is arranged outside the second connecting section; the third connecting section is formed with the first threaded section.

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

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

[0013] Optionally, the one-way rotation clutch structure comprises a movable one-way tooth, an elastic member and a relatively fixed one-way tooth, one of the main body and the shell is provided with a receiving groove, and the other of the main body and the 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 member; the relatively fixed one-way tooth is formed with a one-way groove;

[0014] When the shell rotates along the first direction, the movable one-way tooth abuts against the groove wall of the one-way groove, and the shell drives the main body to rotate; when the shell rotates along the second direction, the movable one-way tooth disengages from the groove wall of the one-way groove, and the 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 comprises an arc-shaped portion and a connecting portion connected to each other, the arc-shaped portion is in an arc shape, and the arc-shaped portion is rotatably located in the accommodating groove;

[0016] One of the main body and the shell is provided with a mounting groove, and the mounting groove is arranged opposite to the accommodating groove; the elastic member includes a protruding portion and a mounting portion connected to each other, the mounting portion is located in the mounting groove, the protruding portion protrudes out of the mounting groove, and the protruding portion contacts the connecting portion.

[0017] Optionally, one end of the elastic member is directly or indirectly fixed to the outer shell, and the other end of the elastic member is in contact with the movable one-way tooth; the outer surface of the movable one-way tooth is provided with a stop portion extending along the axial direction of the shaft rod, and the outer shell is provided with a stop groove cooperating with the stop portion, the stop portion can move along the axial direction of the shaft rod relative to the groove wall of the stop groove, and the outer shell and the movable one-way tooth rotate synchronously through the stop portion.

[0018] Optionally, the main body includes a load output portion, a transition portion and a one-way fixing portion which are connected in sequence, and the one-way fixing portion is used to be connected to the one-way rotation clutch structure.

[0019] Optionally, the tower base structure further includes a torque sensing component, and the torque sensing component is located in the transition portion; and / or,

[0020] The tower base structure further includes a speed sensor, which includes a speed sensing circuit part and a speed-sensed rotating part. The speed sensing circuit part is located at the transition part, and the speed-sensed rotating part is arranged in a housing.

[0021] Optionally, the tower base structure further includes a primary control circuit, a secondary control circuit and a sensor housing, the primary control circuit provides electric energy to the secondary control circuit by radio, and the secondary control circuit transmits a torque signal and / or a speed signal to the primary control circuit by radio or infrared, the primary control circuit is fixed in the sensor housing, the sensor housing is sleeved outside the shaft and is located on a side of the main body away from the shell, and the main body can rotate relative to the sensor housing;

[0022] The secondary control circuit is electrically connected to the torque sensing component, and / or the secondary control circuit is electrically connected to the speed sensing circuit portion.

[0023] Optionally, the sensor housing is snap-fitted to the main body, and the main body can rotate relative to the sensor housing; or, the sensor housing has a housing portion and a sleeve portion that are connected, and the inner ring of the second bearing abuts against the housing portion on one end face away from the outer shell, and the sleeve portion is located between the shaft and the inner ring of the second bearing.

[0024] Optionally, the shaft rod includes a shaft sleeve and a stick body, the shaft sleeve is sleeved outside the stick body, the first step is formed between the end face of one end of the shaft sleeve and the stick body, and the inner ring of the first bearing abuts against the first step near the end face of one side of the main body; a third step is formed between the end face of the other end of the shaft sleeve and the stick body, and the inner ring of the second bearing abuts against the third step near the end face of one side of the outer shell.

[0025] In addition, the present invention also provides an electric bicycle, which includes the tower base structure as described above.

[0026] In the technical solution of the present invention, the end face of the inner ring of the first bearing close to the main body abuts against the first step, and the first step is used to limit the inner ring of the first bearing from moving to the left. The end face of the inner ring of the first bearing away from the main body abuts against the fastener, and the fastener is used to limit the inner ring of the first bearing from moving to the right. The fastener cooperates with the first step to fix the inner ring of the first bearing to the shaft rod. The inner ring of the first bearing is fixedly connected to the shaft rod by applying an extrusion force from right to left to the inner ring of the first bearing through the fastener. The inner ring of the first bearing is connected to the outer surface of the shaft rod in a clearance sliding fit, thereby improving the operability of the electric bicycle. In addition, the main body component and the outer shell component in the present application can be separated, and the main body component and the outer shell component can be replaced separately, so that the main body component and the outer shell component are more flexible to use and the after-sales cost of the tower base structure is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 It is a cross-sectional schematic diagram of an existing tower base structure;

[0029] Figure 2 It is the use status diagram of the tower foundation structure;

[0030] Figure 3 for Figure 2 Assembly explosion diagram;

[0031] Figure 4 A cross-sectional schematic diagram of a tower base structure provided in one embodiment of the present application;

[0032] Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle;

[0033] Figure 6 An exploded schematic diagram of the assembly of a tower base structure provided in one embodiment of the present application;

[0034] Figure 7 for Figure 6 An exploded view of the middle housing assembly;

[0035] Figure 8A schematic diagram of the structure of a shaft rod that cooperates with a tower base structure provided in one embodiment of the present application;

[0036] Fig. 9 An exploded schematic diagram of a one-way rotating clutch structure in a tower base structure provided in an embodiment of the present application;

[0037] Fig.10 for Fig. 9 A schematic structural diagram of the housing assembly from another perspective;

[0038] Fig.11 for Fig. 9 A schematic diagram of a state in which the housing rotates along a first direction;

[0039] Fig.12 for Fig. 9 A schematic diagram of a state in which the housing rotates along a second direction;

[0040] Fig.13 An exploded schematic diagram of a one-way rotating clutch structure in a tower base structure provided in another embodiment of the present application;

[0041] Fig.14 for Fig.13 Another perspective schematic diagram of the housing in FIG.

[0042] Fig.15 for Fig.13 A cross-sectional schematic diagram from one perspective with a shaft stick;

[0043] Fig.16 for Fig.13 A cross-sectional diagram from another perspective;

[0044] Fig.17 A cross-sectional schematic diagram of a tower base structure provided in another embodiment of the present application;

[0045] Fig.18 for Fig.17 The enlarged schematic diagram of point B in the middle;

[0046] Fig.19 A cross-sectional schematic diagram of a tower base structure provided in yet another embodiment of the present application;

[0047] Fig. 20 for Fig.19 Enlarged schematic diagram of point C in the middle.

[0048] Description of Figure Numbers:

[0049]

[0050]

[0051] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0054] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0057] In the present invention, 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 explain the Figure 1 The relative position relationship between the components in the shown posture. If the specific posture changes, the directional indication will also change accordingly.

[0058] The present invention provides a tower base structure 100 and an electric bicycle.

[0059] For the convenience of description, spatial features such as grooves, holes, and cavities are marked with arrowheads in the drawings, and physical structural features are marked with arrowheads in the drawings.

[0060] In order to better explain the technical solution of this application, the related technical solutions of existing products are introduced for illustration. Figure 1 These are all related schematic diagrams of the existing tower foundation structure. Figure 1 FIG. 1 is a cross-sectional schematic diagram of an existing tower base structure 100. Figure 2 is a diagram showing the use status of the tower base structure 100, Figure 3 for Figure 2 Schematic diagram of assembly explosion. 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 rod 20 extends in the left and right directions. The main body 50 is arranged outside the shaft rod 20, and the main body 50 is used to connect with the rear wheel hub or the rear drive hub motor of the electric bicycle. The second bearing 70 is arranged in the main body 50, and the outer ring of the second bearing 70 is fixedly connected to the main body 50, which is an interference fit. The second bearing 70 is arranged outside the shaft rod 20, and the inner ring of the second bearing 70 is directly or indirectly connected to the shaft rod 20. The shell 10 is arranged 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 achieve power transmission). The shell bearing 400 is arranged outside the shaft rod 20, and the inner ring of the shell bearing 400 is clearance-matched with the shaft rod 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 fit with the main body 50, and the outer ring of the connecting bearing 300 is interference fit 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.

[0061] like Figure 1As shown, in the existing tower base structure 100, since the inner ring of the connecting bearing 300 and the main body 50 are interference fit, and the outer ring of the connecting bearing 300 and the outer shell 10 are interference fit, when the shaft rod 20 is bent and deformed, the bending deformation of the shaft rod 20 will cause the inner ring and the outer ring of the connecting bearing 300 to bear uneven loads at different rotation angles through the outer shell bearing 400 and the second bearing 70, which will generate a breaking force and increase the friction resistance of 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 flywheel 200. At this time, if the rotating rear wheel during riding 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 at this time), the upper chain will sag too much, and even the derailleur cannot work normally, seriously affecting normal riding. In more serious cases, the chain will be stuck in the flywheel 200 gear plate and the frame, making the entire vehicle unable to be pushed.

[0062] In order to solve the problem that the main body 50 and the housing 10 can only be replaced together but not separately, and the connecting bearing 300 is easily damaged, the present application provides a tower base structure 100. Figures 4 to 8 , Figure 4 This is a cross-sectional schematic diagram of a tower base structure 100 provided in one embodiment of the present application. Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle. Figure 6 This is an exploded schematic diagram of the assembly of a tower base structure 100 provided in one embodiment of the present application. Figure 7 for Figure 6 An exploded schematic diagram of the middle housing component 101, Figure 8 A schematic structural diagram of the shaft rod 20 that cooperates with the tower base structure 100 provided in one embodiment of the present application.

[0063] The tower base structure 100 includes a housing assembly 101, a main body assembly 102, a fastener 40 and a one-way rotation clutch structure 60 (see FIG. Figures 9 to 16 ). The housing component 101 includes a housing 10 and a first bearing 30. The main body component 102 includes a main body 50 and a second bearing 70. The main body 50 is fixedly connected to the outer ring of the second bearing 70 in an interference fit. The main body 50 is rotatably arranged outside the shaft stick 20 through the second bearing 70. The inner ring of the second bearing 70 is directly or indirectly connected to the shaft stick 20 (for example, the inner ring of the second bearing 70 is connected to the sleeve outside the shaft stick 20 as an indirect connection). The main body 50 can rotate relative to the shaft stick 20. The main body 50 is directly or indirectly connected to the shaft stick 20 through the second bearing 70. By providing the second bearing 70 to support the main body 50, the friction coefficient during the rotation of the main body 50 is reduced. The main body 50 and the housing 10 are freely detachably connected through the one-way rotating clutch structure 60.

[0064] At least one first bearing 30 is disposed between the housing 10 and the shaft 20, and an outer ring 32 of the first bearing 30 is fixedly connected to the housing 10, and the outer ring 32 of the first bearing 30 rotates with the housing 10. The shaft 20 is formed with a first step 21. The fastener 40 is disposed outside the shaft 20, and the fastener 40 is detachably connected to the shaft 20.

[0065] The end face (left end face) of the inner ring 31 of the first bearing 30 close to the main body 50 abuts against the first step 21, and the first step 21 is used to limit the inner ring 31 of the first bearing 30 from moving leftward. The end face (right end face) of the inner ring 31 of the first bearing 30 away from the main body 50 abuts against the fastener 40, and the fastener 40 is used to limit the inner ring 31 of the first bearing 30 from moving rightward. The fastener 40 cooperates with the first step 21 to fix the inner ring 31 of the first bearing 30 with the shaft 20, so that the first step 21 and the fastener 40 are used to limit the axial displacement of the first bearing 30. The inner ring 31 of the first bearing 30 is applied with an extrusion force from right to left through the fastener 40, so that the inner ring 31 of the first bearing 30 is fixedly connected with the shaft 20. The inner ring 31 of the first bearing 30 is connected with the outer surface of the shaft 20 by a clearance sliding fit, thereby improving the operability of the electric bicycle.

[0066] In addition, if Figure 1 As shown, when the existing freewheel base structure 100 is disassembled, since the inner ring of the connecting bearing 300 and the main body 50 are interference fit, the outer ring of the connecting bearing 300 and the housing 10 are also interference fit, and the main body 50 is fixed to the motor or the rear wheel hub, once the main body 50 is fixed, the housing 10 and the housing bearing 400 are difficult to remove from the main body 50. In addition, the connecting bearing 300 connects the main body 50 and the housing 10 together, and when replacing, the main body 50 and the housing 10 can only be replaced together, and cannot be replaced separately, which increases the after-sales cost of the freewheel base structure 100.

[0067] Please refer to Figures 4 to 6, and the inner ring 31 of the first bearing 30 in the present application is fixedly connected to the shaft rod 20 by the fastener 40, which facilitates the replacement of the vulnerable parts (housing 10, first bearing 30, etc.) of the tower base structure 100, making the installation and disassembly of the housing assembly 101 of the tower base structure 100 more convenient, and improving the flexibility of use of the tower base structure 100. When disassembling the housing assembly 101 of the tower base structure 100 in the present application, remove the fastener 40 from the shaft rod 20, and then remove the housing assembly 101 assembled with the first bearing 30 from the shaft rod 20, so that the main assembly 102 is separated from the housing assembly 101, and at this time, the vulnerable parts (movable one-way teeth 61, elastic member 62) can also be cleaned, maintained, or even replaced and repaired. During installation by the manufacturer, the main body component 102 can be first assembled to the rear wheel hub or the hub motor and fixed, and then the outer shell component 101 assembled with the first bearing 30 can be slidably assembled to the shaft rod 20 so that the left end of the first bearing 30 abuts against the first step 21. After the outer shell component 101 and the main body component 102 are assembled, the fastener 40 can be installed on the shaft rod 20 so that the fastener 40 abuts against the right end of the first bearing 30.

[0068] Alternatively, the main body component 102 and the outer shell component 101 may be assembled to form a semi-finished product, and then the semi-finished product may be slidably assembled onto the shaft rod 20 so that the left end of the first bearing 30 abuts against the first step 21, and then the main body 50 may be fixed to the motor or the rear wheel hub, and then the fastener 40 may be installed on the shaft rod 20 so that the fastener 40 abuts against the right end of the first bearing 30.

[0069] That is to say, the main body component 102 and the shell component 101 in the present application can be separated, and the main body component 102 and the shell component 101 can be replaced separately, so that the main body component 102 and the shell component 101 have higher flexibility in use and reduce the after-sales cost of the tower base structure 100.

[0070] It can be understood from the above that the main body component 102 and the shell component 101 are connected by the movable one-way rotating clutch structure 60. When the shaft rod 20 is axially bent and deformed, the movable one-way rotating clutch structure 60 can completely absorb the bending deformation of the shaft rod 20. The main body component 102 has its own independent bearing, namely the second bearing 70, and the shell component 101 also has its own independent bearing, namely the first bearing 30. The rotational connection relationship between the main body component 102 and the shell component 101 is the one-way rotating clutch structure 60. The one-way rotating clutch structure 60 has a large movable space and is completely unaffected by the slight axial deformation of the shaft rod 20.

[0071] It is understandable that the fastener 40 can be a nut, a gasket, a retaining ring or other structures, the fastener 40 is detachably connected to the shaft rod 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.

[0072] In one embodiment, the outer ring 32 of the first bearing 30 is interference fit 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 the advantages of good centering, large load-bearing capacity, and little weakening of the shaft strength.

[0073] In another embodiment, the outer ring 32 of the first bearing 30 is fixedly connected to the housing 10 by glue (not shown in the figure). The glue can be epoxy glue, acrylic glue or other glue, and the glue can tightly bond the outer ring 32 of the first bearing 30 to the housing 10. The present application does not limit the specific type of glue.

[0074] In one embodiment, the housing 10 is formed with 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 limit the outer ring 32 of the first bearing 30 from moving leftward, and the housing step 11 can be used to position the first bearing 30 when it is installed in the housing 10, thereby improving the assembly efficiency of the first bearing 30 and the housing 10.

[0075] In one embodiment, the shaft 20 is formed with a first thread segment 22, the fastener 40 is formed with a second thread segment 41, and the first thread segment 22 is threadedly connected to the second thread segment 41. The fastener 40 and the shaft 20 are detachably connected by threaded connection, thereby improving the efficiency of installation and removal of the fastener 40. In addition, the threaded connection can be self-locking, so that the connection between the fastener 40 and the shaft 20 is tighter and more reliable.

[0076] In one embodiment, please refer to Figure 4 and Figure 8 The shaft rod 20 includes a first connecting section 23, a second connecting section 24 and a third connecting section 25 which are connected in sequence. The first connecting section 23, the second connecting section 24 and the third connecting section 25 are connected in sequence from left to right.

[0077] The cross-sectional dimension of the second connecting section 24 is smaller than that of the first connecting section 23. A first step 21 is formed between the first connecting section 23 and the second connecting section 24. The first bearing 30 is disposed outside the second connecting section 24. The third connecting section 25 is formed with a first threaded section 22.

[0078] The cross-sectional dimension of the third connecting segment 25 may be equal to the cross-sectional dimension of the second connecting segment 24 .

[0079] Alternatively, the cross-sectional dimension of the third connecting segment 25 is smaller than the cross-sectional dimension of the second connecting segment 24, so as to avoid interference or obstruction of the first threaded segment 22 in the process of sliding the first bearing 30 onto the shaft 20, thereby improving assembly efficiency.

[0080] In one embodiment, please refer to Figure 4 and Figure 5 The number of the first bearings 30 is at least two, and at least two first bearings 30 are distributed along the axial direction of the shaft 20. By providing at least two first bearings 30, the housing 10 can reduce the deflection of the housing 10 when different flywheels 200 are working under stress, so that the stress of 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 the first bearings 30 is two. If the lengths of the main body 50 and the housing 10 permit, the number of the first bearings 30 may be three, four or other numbers.

[0081] Please refer to Figure 4 , Figure 5 and Figure 7 An inner gasket 81 is provided between the inner rings 31 of the two first bearings 30. The inner gasket 81 can separate the two first bearings 30 as far as possible in the axial direction of the shaft 20, so as to minimize the deflection of the housing 10 when the flywheel 200 is working at the maximum gear, and make the stress on the housing 10 more uniform. The inner rings 31 of the two first bearings 30 are respectively in contact with the inner gasket 81. By providing the inner gasket 81, the distance between the inner rings 31 of the two first bearings 30 along the axial direction is fixed, so that when the inner rings 31 of the first bearings 30 are subjected to the axial force of the fastener 40, the inner rings 31 of the first bearings 30 can be prevented from being affected by the axial force and failing to work normally. Compared with the two first bearings 30 abutting against each other, the stress on the housing 10 can be further made more uniform when the leftmost flywheel 200 is working.

[0082] Furthermore, an outer gasket 82 is arranged between the outer rings 32 of the two first bearings 30, and the inner gasket 81 is located inside the outer gasket 82. The axial dimensions of the inner gasket 81 and the outer gasket 82 are as similar as possible. In this way, when the outer rings 32 of the two first bearings 30 are tightly fitted and pressed into the outer housing 10, the outer rings 32 and the inner rings 31 of the first bearings 30 are prevented from being subjected to axial force and damaging the first bearings 30.

[0083] At this time, the housing assembly 101 includes the housing 10 , the first bearing 30 , the inner gasket 81 and the outer gasket 82 .

[0084] It is understandable that the first bearing 30 can be a ball bearing or other bearings. The sizes of the two first bearings 30 along the axial direction of the shaft rod 20 can be the same or different, and can be flexibly adjusted according to actual conditions.

[0085] In other embodiments, the two first bearings 30 may directly abut against each other or be a double-row bearing (a rolling bearing characterized by having two rows of rolling elements along the circumference).

[0086] The shaft rod 20 also includes a fourth connecting section 26 ( Figure 4The first connecting section 23, the second connecting section 24, the third connecting section 25 and the fourth connecting section 26 are divided by dotted lines, the fourth connecting section 26 is connected to the first connecting section 23, the cross-sectional dimension of the first connecting section 23 is smaller than the cross-sectional dimension of the fourth connecting section 26, a second step 27 is formed between the fourth connecting section 26 and the first connecting section 23, and the inner ring of the second bearing 70 directly or indirectly abuts against the second step 27. The second step 27 is used to limit the inner ring of the second bearing 70 from moving leftward, and the second step 27 can be used for positioning when the second bearing 70 is installed on the shaft 20, while improving the assembly efficiency of the second bearing 70 and the shaft 20.

[0087] It can be understood that the first connecting section 23, the second connecting section 24, the third connecting section 25 and the fourth connecting section 26 can be an integrally formed part, saving assembly steps.

[0088] In one embodiment, see Figures 9 to 12 , Fig. 9 FIG. 1 is an exploded schematic diagram of a one-way rotating clutch structure 60 in a tower base structure 100 provided in an embodiment of the present application. Fig.10 for Fig. 9 A schematic structural diagram of the housing assembly 101 from another perspective, Fig.11 for Fig. 9 A schematic diagram of a state in which the housing 10 rotates along a first direction, Fig.12 for Fig. 9 Schematic diagram of the state in which the housing 10 rotates along the second direction. Fig.11 and Fig.13 The dotted line with an arrow indicates the direction of rotation.

[0089] The one-way rotating clutch structure 60 includes a movable one-way tooth 61, an elastic member 62 and a relatively fixed one-way tooth 63. One of the main body 50 and the shell 10 is provided with a receiving groove 51, and the other of the main body 50 and the shell 10 is provided with a relatively fixed one-way tooth 63. In this embodiment, the main body 50 is provided with a receiving groove 51, and the shell 10 is provided with a relatively fixed one-way tooth 63. It can be understood that in other embodiments, the structure can be converted, the shell 10 is provided with a receiving groove 51, and the main body 50 is provided with a relatively fixed one-way tooth 63.

[0090] The main body 50 is provided with a receiving groove 51, and the movable one-way tooth 61 is movably located in the receiving groove 51 through an elastic member 62, and 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 housing 10, and the relatively fixed one-way tooth 63 is formed with a one-way groove 631.

[0091] like Fig.11 As shown, when the pedal applies a positive torque to the housing 10, the housing 10 moves in a first direction (the first direction is Fig.11The movable one-way tooth 61 abuts against the groove wall of the one-way groove 631, and the housing 10 drives the main body 50 to rotate through the movable one-way tooth 61. At this time, the housing 10 and the main body 50 keep synchronous operation, that is, the housing 10 and the main body 50 are relatively stationary.

[0092] like Fig.12 As shown, when the pedal applies a reverse torque to the housing 10, the housing 10 moves in the second direction (the second direction is Fig.12 The second direction is opposite to the first direction, the movable one-way tooth 61 is separated from the groove wall of the one-way groove 631, and the housing 10 and the main body 50 rotate relatively.

[0093] The movable one-way tooth 61 includes an arc portion 611 and a connecting portion 612 connected to each other, the arc portion 611 is in an arc shape, and the arc portion 611 is rotatably located in the receiving groove 51. The main body 50 is provided with a mounting groove 52 (in the case where the housing 10 is provided with the receiving groove 51, the housing 10 is also provided with a mounting groove 52, and the position of the mounting groove 52 is adjusted to the position of the receiving groove 51), the mounting groove 52 is arranged opposite to the receiving groove 51, and the elastic member 62 includes a protruding portion 621 and a mounting portion 622 connected to each other, the mounting portion 622 is located in the mounting groove 52, the protruding portion 621 protrudes out of the mounting groove 52, and the protruding portion 621 contacts the connecting portion 612.

[0094] like Fig.11 As shown, when the pedal applies a positive torque to the shell 10, the shell 10 rotates in the first direction (i.e., clockwise), the connecting portion 612 of the movable one-way tooth 61 abuts against the groove wall of the one-way groove 631, and the shell 10 drives the main body 50 to rotate. At this time, the shell 10 and the main body 50 maintain synchronous operation, that is, the shell 10 and the main body 50 are relatively stationary.

[0095] like Fig.12 As shown, when the pedal applies reverse torque to the shell 10, the shell 10 rotates in the second direction (i.e., counterclockwise), the arc portion 611 rotates relative to the accommodating groove 51, the connecting portion 612 causes the protruding portion 621 of the elastic member 62 to deform inward, and the connecting portion 612 gradually separates from the groove wall of the one-way groove 631, and the shell 10 and the main body 50 rotate relative to each other.

[0096] Understandably, Figures 9 to 12 In the embodiment, the relatively fixed one-way tooth 63 and the housing 10 can be integrally formed, saving the assembly steps of the relatively fixed one-way tooth 63 and the housing 10. The relatively fixed one-way tooth 63 and the housing 10 can also be separate.

[0097] The main body 50 includes a load output portion 55 and a one-way fixing portion 54 . The one-way fixing portion 54 is provided with a receiving groove 51 and a mounting groove 52 .

[0098] The one-way rotation clutch structure 60 further includes a fixing plate 64, and the one-way fixing portion 54 further includes a fixing groove 53. The fixing plate 64 is located in the fixing groove 53, and the fixing plate 64 is used to limit the movable one-way tooth 61 and the elastic member 62 from moving rightward, ensuring that the movable one-way tooth 61 is in the receiving groove 51, and ensuring that the elastic member 62 is in the installation groove 52.

[0099] In other embodiments, the elastic member 62 may also be a wire spring or other elastic elements.

[0100] Please refer to Figures 13 to 16 , Figures 13 to 16 It is another one-way rotation clutch structure 60. Fig.13 An exploded schematic diagram of a one-way rotating clutch structure 60 in a tower base structure 100 provided in another embodiment of the present application; Fig.14 for Fig.13 Another perspective schematic diagram of the housing 10; Fig.15 for Fig.13 A cross-sectional schematic diagram from one perspective with a shaft stick; Fig.16 for Fig.13 A cross-sectional diagram from another perspective.

[0101] In this embodiment, the housing 10 is provided with a receiving groove 51, and the main body 50 is provided with a relatively fixed one-way tooth 63. It is understandable that in other embodiments, the structure can be transformed, the main body 50 is provided with a receiving groove 51, and the housing 10 is provided with a relatively fixed one-way tooth 63.

[0102] The receiving groove 51 extends along the axial direction of the shaft rod 20. The elastic member 62 is a spring, which has the advantages of being easy to obtain and easy to install. One end of the elastic member 62 is directly or indirectly fixed to the housing 10. The elastic member 62 can directly abut against the housing 10 to achieve position fixing. Fig.15 As shown, the elastic member 62 can also abut against the first bearing 30 to achieve position limiting fixation, thereby achieving the position limiting fixation of the elastic member 62 and the housing 10 indirectly. The other end of the elastic member 62 abuts against the movable one-way tooth 61 .

[0103] The outer surface of the movable one-way tooth 61 is provided with a rotation-stopping portion 613, and the rotation-stopping portion 613 extends along the axial direction of the shaft rod 20. A rotation-stopping groove 12 cooperating with the rotation-stopping portion 613 is provided in the housing 10, and the rotation-stopping groove 12 is located on the groove wall of the accommodating groove 51, and the rotation-stopping groove 12 extends along the axial direction of the shaft rod 20. The rotation-stopping portion 613 can move along the axial direction of the shaft rod 20 relative to the groove wall of the rotation-stopping groove 12, and the housing 10 and the movable one-way tooth 61 rotate synchronously through the rotation-stopping portion 613.

[0104] When the pedal applies a positive torque to the shell 10, the shell 10 rotates along 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 shell 10 and the main body 50 maintain synchronous operation, that is, the shell 10 and the main body 50 are relatively stationary.

[0105] When the pedal applies reverse torque to the shell 10, the shell 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, and the stop portion 613 moves axially along the shaft rod 20 relative to the groove wall of the stop groove 12. The movable one-way tooth 61 compresses and deforms the elastic part 62, and the shell 10 and the main body 50 rotate relative to each other.

[0106] It can be understood that there are multiple movable one-way teeth 61 and one-way grooves 631, and the multiple movable one-way teeth 61 and one-way grooves 631 are distributed along the circumference of the shaft 20. The relatively fixed one-way teeth 63 and the main body 50 can be integrally formed, saving the installation steps between the relatively fixed one-way teeth 63 and the main body 50. The relatively fixed one-way teeth 63 and the main body 50 can also be separate.

[0107] Alternatively, the one-way rotation clutch structure 60 may also include a one-way clutch structure, such as a one-way bearing, which is connected between the housing 10 and the main body 50 .

[0108] It is understandable that during assembly, the elastic member 62 and the movable one-way tooth 61 will be installed or removed together with the housing assembly 101 .

[0109] In some embodiments, please refer to Fig. 9 The tower base structure 100 also includes a torque sensing component (not shown), which is arranged on the main body 50. The torque sensing component is used to measure torque. A transition portion 56 is arranged between the load output portion 55 and the one-way fixing portion 54, and the torque sensing component is arranged on the transition portion 56. After the housing 10 is subjected to rotational torque, it is transmitted to the one-way fixing portion 54, the transition portion 56, and the load output portion 55 of the main body 50 in sequence through the one-way rotating clutch structure 60. The torque sensing component (this solution uses a resistance strain gauge) is fixed on the transition portion 56 to sense the torque transmitted from the housing 10. Compared with other positions, the measurement result of the torque sensing component arranged on the transition portion 56 can be more accurate.

[0110] In some embodiments, please refer to Figure 4 , Figure 7 and Fig.13The tower base structure 100 further includes a speed sensor, which includes a speed sensing circuit portion and a speed-sensing rotating portion 90. The speed sensing circuit portion is disposed on the main body 50. In this embodiment, the speed sensing circuit portion is disposed on the transition portion 56 of the main body 50, and the speed-sensing rotating portion 90 is disposed in the housing 10. Fig.10 and Fig.14 The speed-sensing rotating part 90 is fixedly connected to the inner surface of the housing 10 by gluing, and when the housing 10 is removed for replacement, the speed-sensing rotating part 90 is removed together with the housing 10 .

[0111] The speed-sensing rotating part 90 can be made of ferromagnetic material, specifically a magnetic ring with a plurality of N and S magnetic poles on the inner diameter. The speed sensing circuit part is a Hall element. The reverse speed of the shell 10 is sensed by measuring the change in magnetic flux of the speed-sensing rotating part 90. The pedaling frequency (speed and direction of foot pedaling) data can be accurately calculated in combination with the speed data of the whole vehicle. The data is then combined with its torque data, the speed data of the whole vehicle, etc. to give to the whole vehicle control system. The system better controls the torque and speed of the motor according to the various riding perception data provided by these sensors to meet the replaced intelligent riding comfort, which is the so-called human-vehicle integrated riding experience.

[0112] In some embodiments, please refer to Fig.17 and Fig.18 , Fig.17 A cross-sectional schematic diagram of a tower base structure 100 provided in another embodiment of the present application; Fig.18 for Fig.17 The tower base structure 100 further 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 by radio, and the secondary control circuit 104 transmits torque signals and / or speed signals to the primary control circuit 105 by radio or infrared. The primary control circuit 105 is fixed in the sensor housing 103, and the sensor housing 103 is sleeved outside the shaft 20. The sensor housing 103 is located on the side of the main body 50 away from the housing 10, and the main body 50 can rotate relative to the sensor housing 103.

[0113] 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 it through the data output line.

[0114] The secondary control circuit 104 is electrically connected to the speed sensing circuit part. The data sensed by the speed sensing circuit part 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 it through the data output line.

[0115] Furthermore, the primary control circuit 105 provides power to the secondary control circuit 104 via wireless means.

[0116] The sensor housing 103 is snap-fitted with 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 snap 1031, and the main body 50 has a second snap 57, and the first snap 1031 is snap-fitted with the second snap 57. Through the cooperation between the first snap 1031 and the second snap 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 reliability of signal transmission being reduced due to the long distance between the sensor housing 103 and the main body 50 along the axial direction of the shaft 20.

[0117] Alternatively, please refer to Fig.19 and Fig. 20 , Fig.19 This is a cross-sectional schematic diagram of a tower base structure 100 provided in yet another embodiment of the present application. Fig. 20 for Fig.19 Enlarged schematic diagram at C in the middle. The sensor housing 103 has a housing portion 1032 and a sleeve portion 1033 connected to each other. The inner ring of the second bearing 70 is away from the end face of the housing 10 on one side and abuts against the housing portion 1032, 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 the sensor housing 103 and the main body 50 along the axial direction of the shaft 20. The distance is far, which leads to a decrease in the reliability of signal transmission. 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.

[0118] 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 surface of the inner ring of the second bearing 70, limiting the housing portion 1032 from moving rightward. The limiting protrusion 1034 abuts against the right end surface of the inner ring of the second bearing 70, limiting the housing portion 1032 from moving leftward, 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.

[0119] Specifically, since the thickness of the sleeve portion 1033 is relatively thin, the sleeve portion 1033 can have a certain amount of deformation. The sleeve portion 1033 can be squeezed so that the inner ring of the second bearing 70 is located between the shell portion 1032 and the limiting protrusion 1034, and then the sensor shell 103 assembled with the second bearing 70 is installed on the shaft rod 20. The shaft rod 20 reduces the deformation space of the sleeve portion 1033, so that the limiting protrusion 1034 cannot be separated from the second bearing 70, thereby limiting the shell portion 1032 from moving to the left.

[0120] In some embodiments, please refer to Fig.17 and Fig.18 The shaft stick 20 includes a shaft sleeve 28 and a stick body 29. The shaft sleeve 28 is sleeved outside the stick body 29. A first step 21 is formed between the end face (right end face) of one end of the shaft sleeve 28 and the stick body 29. The end face of the inner ring of the first bearing 30 close to the main body 50 abuts against the first step 21. The first step 21 is used to limit the first bearing 30 from moving leftward. A third step 281 is formed between the end face (left end face) of the other end of the shaft sleeve 28 and the stick body 29. The end face of the inner ring of the second bearing 70 close to the housing 10 abuts against the third step 281. The third step 281 is used to limit the second bearing 70 from moving rightward.

[0121] The stick body 29 is formed with a second step 27 , and the inner ring of the second bearing 70 abuts against the second step 27 on the end face away from the housing 10 . The second step 27 is used to limit the second bearing 70 from moving leftward.

[0122] The shaft sleeve 28 can be fixedly connected to the stick body 29, or the shaft sleeve 28 can be connected to the stick body 29 with a sliding gap.

[0123] In addition, the present invention also provides an electric bicycle, comprising the tower base structure 100 as described above. The specific structure of the tower base structure 100 refers to the above embodiment. Since the electric bicycle adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described one by one here.

[0124] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A tower base structure, characterized in that: The tower base structure includes a shell assembly, a main body assembly, a fastener and a one-way rotation clutch structure, the shell assembly includes a 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 arranged outside the shaft through the second bearing, and the main body and the shell are freely detachably connected through the one-way rotation clutch structure; At least one first bearing is arranged between the housing and the shaft, and the outer ring of the first bearing is fixedly connected to the housing; The shaft rod is provided with a first step; the fastener is arranged outside the shaft rod and is detachably connected to the shaft rod; the inner ring of the first bearing is in contact with the first step at the end face close to the main body, and the inner ring of the first bearing is in contact with the fastener at the end face away from the main body, so that the inner ring of the first bearing is fixedly connected to the shaft rod, and the first step and the fastener are used to limit the axial displacement of the first bearing.

2. The tower base structure according to claim 1, characterized in that: The outer ring of the first bearing is interference fit with the housing, or the outer ring of the first bearing is fixedly connected with the housing by glue.

3. The tower base structure according to claim 2, characterized in that: The housing is formed with a housing step, and one end surface of the outer ring of the first bearing abuts against the housing step.

4. The tower base structure according to claim 1, characterized in that: The shaft rod is formed with a first thread segment, and the fastener is formed with a second thread segment, and the first thread segment is threadedly connected with the second thread segment.

5. The tower base structure according to claim 4, characterized in that: The shaft rod includes a first connecting section, a second connecting section and a third connecting section which are connected in sequence, the cross-sectional size of the second connecting section is smaller than the cross-sectional size of the first connecting section, the first step is formed between the first connecting section and the second connecting section, the first bearing is arranged outside the second connecting section; the third connecting section is formed with the first threaded section.

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

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

8. The tower foundation structure according to any one of claims 1 to 6, characterized in that: The one-way rotating clutch structure comprises a movable one-way tooth, an elastic member and a relatively fixed one-way tooth, one of the main body and the shell is provided with a receiving groove, and the other of the main body and the 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 member; the relatively fixed one-way tooth is formed with a one-way groove; When the shell rotates along the first direction, the movable one-way tooth abuts against the groove wall of the one-way groove, and the shell drives the main body to rotate; When the shell rotates in the second direction, the movable one-way tooth disengages from the groove wall of the one-way groove, and the shell rotates relatively to the main body; The second direction is opposite to the first direction.

9. The tower base structure according to claim 8, characterized in that: The movable one-way tooth comprises an arc-shaped portion and a connecting portion connected to each other, the arc-shaped portion is in an arc shape, and the arc-shaped portion is rotatably located in the receiving groove; One of the main body and the shell is provided with a mounting groove, and the mounting groove is arranged opposite to the accommodating groove; the elastic member includes a protruding portion and a mounting portion connected to each other, the mounting portion is located in the mounting groove, the protruding portion protrudes out of the mounting groove, and the protruding portion contacts the connecting portion.

10. The tower base structure according to claim 8, characterized in that: One end of the elastic member is directly or indirectly fixed to the outer shell, and the other end of the elastic member is in contact with the movable one-way tooth; the outer surface of the movable one-way tooth is provided with a stop portion extending along the axial direction of the shaft rod, and the outer shell is provided with a stop groove cooperating with the stop portion, the stop portion can move along the axial direction of the shaft rod relative to the groove wall of the stop groove, and the outer shell and the movable one-way tooth rotate synchronously through the stop portion.

11. The tower foundation structure according to any one of claims 1 to 6, characterized in that: The main body comprises a load output portion, a transition portion and a one-way fixing portion which are connected in sequence, and the one-way fixing portion is used to be connected with the one-way rotation clutch structure.

12. The tower foundation structure according to claim 11, characterized in that: The tower base structure further comprises a torque sensing component, wherein the torque sensing component is located at the transition portion; and / or, The tower base structure further includes a speed sensor, which includes a speed sensing circuit part and a speed-sensed rotating part. The speed sensing circuit part is located at the transition part, and the speed-sensed rotating part is arranged in a housing.

13. The tower foundation structure according to claim 12, characterized in that: The tower base structure also includes a primary control circuit, a secondary control circuit and a sensor housing, wherein the primary control circuit provides electric energy to the secondary control circuit by radio and the secondary control circuit transmits a torque signal and / or a speed signal to the primary control circuit by radio or infrared, the primary control circuit is fixed in the sensor housing, the sensor housing is sleeved outside the shaft and is located on a side of the main body away from the shell, and 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 electrically connected to the speed sensing circuit portion.

14. The tower foundation structure according to claim 13, characterized in that: The sensor housing is snap-fitted to the main body, and the main body can rotate relative to the sensor housing; or, the sensor housing has a housing portion and a sleeve portion that are connected, and the end face of the inner ring of the second bearing that is away from the outer shell is abutted against the housing portion, and the sleeve portion is located between the shaft and the inner ring of the second bearing.

15. The tower foundation structure according to any one of claims 1 to 6, characterized in that: The shaft rod includes a shaft sleeve and a rod body, the shaft sleeve is sleeved outside the rod body, the first step is formed between the end face of one end of the shaft sleeve and the rod body, the inner ring of the first bearing is in contact with the first step near the end face of one side of the main body; a third step is formed between the end face of the other end of the shaft sleeve and the rod body, the inner ring of the second bearing is in contact with the third step near the end face of one side of the outer shell.

16. An electric bicycle, characterized in that: The electric bicycle comprises the freewheel base structure according to any one of claims 1 to 15.

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