Tower footing, electric bicycle driving assembly with same and electric bicycle

Abstract

The invention discloses a tower footing, an electric bicycle driving assembly with the tower footing and an electric bicycle. Wherein the tower footing comprises a flywheel seat and a first bearing, the flywheel seat can be driven by a driving piece of the electric bicycle to rotate around the axis of the flywheel seat, the flywheel seat comprises a flywheel seat body and a connecting part, the connecting part is connected to one end of the peripheral face of the flywheel seat body and used for being connected with the driving piece, and a concave part is arranged on the peripheral face of the flywheel seat body; in the axis direction, the concave part is located between the other end face, away from the connecting part, of the flywheel seat body and the connecting part, and the end face, close to the connecting part, of the concave part is a first wall face. The first bearing is sleeved with the flywheel seat body, and the circumferential side wall of the first bearing is located on the radial inner side of the first wall face. According to the tower footing, the size of a driving part connected with the tower footing is smaller, and the power is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of electric bicycle wheel drive, and more particularly, to a freehub body and an electric bicycle drive assembly and an electric bicycle having the same. Background Art

[0002] The freehub body is a main accessory of an electric bicycle. As an overrunning clutch, it plays a role of unidirectionally transmitting torque during human pedaling, and does not transmit torque during coasting or motor drive. For an electric bicycle provided with a hub motor, the miniaturization and high power of the motor are one of the directions for optimizing the performance of the electric bicycle. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a freehub body, which is beneficial to making the drive member connected to the freehub body smaller in volume and higher in power.

[0004] Another object of the present invention is to provide an electric bicycle drive assembly having the above freehub body.

[0005] Another object of the present invention is to provide an electric bicycle having the above electric bicycle drive assembly.

[0006] The freehub body according to an embodiment of the present invention is provided on an electric bicycle. The freehub body includes a freewheel seat and a first bearing. The freewheel seat can rotate around its own axis under the drive of the drive member of the electric bicycle. The freewheel seat includes a freewheel seat body and a connecting portion. The connecting portion is connected to one end of the outer peripheral surface of the freewheel seat body and is used for connecting to the drive member. A concave portion is provided on the outer peripheral surface of the freewheel seat body. In the axial direction, the concave portion is located between the other end face of the freewheel seat body away from the connecting portion and the connecting portion. One end face of the concave portion close to the connecting portion is a first wall surface. The first bearing is sleeved in the freewheel seat body, and the circumferential side wall of the first bearing is located radially inside the first wall surface.

[0007] In the freehub body according to an embodiment of the present invention, the circumferential side wall of the first bearing in the freehub body is located radially inside the first wall surface, that is, the outer diameter of the first bearing is smaller, so that the axial thickness of the first bearing is smaller. Correspondingly, the axial length of the part of one end of the freewheel seat body located inside the drive member can be shorter, so that the part of one end of the freewheel seat body occupying the internal space of the drive member is less, which is beneficial to reducing the size of the drive member, or arranging more components in the drive member to improve the power of the drive member. At the same time, the axial dimension of the freehub body can also be reduced, making the volume of the freehub body smaller. In addition, it also makes the minimum wall thickness of the freewheel seat body not too small, thereby reducing the influence on the structural strength of the freewheel seat body.

[0008] In addition, the tower base according to the above embodiment of the present invention may also have the following additional technical features:

[0009] According to some embodiments of the present invention, in the axial direction, an end surface of the first bearing is located on a side of the first wall surface away from the connecting portion.

[0010] According to some embodiments of the present invention, the other end face of the first bearing is flush with one end face of the flywheel seat body close to the connecting portion; or, in the axial direction, the distance between the other end face of the first bearing and one axial end face of the flywheel seat body close to the connecting portion is less than one tenth of the axial thickness of the first bearing.

[0011] According to some embodiments of the present invention, in the axial direction, the spacing between an end surface of the flywheel seat body close to the connecting portion and the connecting portion is a first spacing, and the ratio of the axial dimension of the connecting portion to the first spacing is greater than or equal to 4.

[0012] According to some embodiments of the present invention, in the axial direction, the spacing between an end surface of the flywheel seat body close to the connecting portion and the connecting portion is a first spacing, and the first spacing is less than or equal to 1 mm.

[0013] According to some embodiments of the present invention, the flywheel seat body has a first shaft hole section and a second shaft hole section that are connected, the aperture of the second shaft hole section is larger than the aperture of the first shaft hole section, the first bearing is arranged in the second shaft hole section and the outer circumferential surface of the first bearing abuts against the inner circumferential surface of the second shaft hole section, and the inner circumferential surface of the second shaft hole section is located radially inward of the first wall surface and is spaced apart from the first wall surface.

[0014] According to some embodiments of the present invention, the axial end face of the second shaft hole segment close to the first shaft hole segment abuts against the axial end face of the first bearing and is located on a side of the first wall surface away from the connecting portion in the axial direction.

[0015] According to some embodiments of the present invention, a ratchet is further included, wherein the ratchet is sleeved outside the flywheel seat body, and an end surface of the ratchet close to one axial end of the connecting portion is arranged opposite to the first wall surface.

[0016] According to some embodiments of the present invention, the outer circumferential wall of the flywheel seat body is provided with a first annular groove connected to the recess, and the inner circumferential wall of the ratchet is provided with a second annular groove, the first annular groove and the second annular groove define a first raceway for accommodating balls, the first annular groove is located on one axial side of the first bearing, and the inner diameter of the first annular groove is smaller than the outer diameter of the first bearing; the tower base also includes an annular member, which is sleeved on the outer side of the other axial end of the flywheel seat body and is detachably connected to the flywheel seat body, and the outer circumferential wall of the annular member is provided with a third annular groove; the inner circumferential wall of the ratchet is provided with a fourth annular groove, and the third annular groove and the fourth annular groove define a second raceway for accommodating balls.

[0017] According to some embodiments of the present invention, the flywheel seat body has a groove body for accommodating the annular member, a gasket is provided between an end surface of one axial end of the groove body and the annular member, and the groove body is open at the other axial end.

[0018] According to some embodiments of the present invention, the recess includes a second wall surface, the second wall surface has a set angle with the first wall surface, a seal is provided between the second wall surface and the inner circumference of the ratchet, and the seal is used to seal the gap between the second wall surface and the inner circumference of the ratchet.

[0019] According to some embodiments of the present invention, it also includes a plurality of pawls, the flywheel seat body is provided with a plurality of pawl grooves spaced apart along the circumferential direction, the plurality of pawls are correspondingly arranged in the plurality of pawl grooves, one end of the pawl is rotatably arranged in the pawl groove, the inner circumferential wall of the ratchet wheel has a plurality of ratchet teeth arranged in sequence along the circumferential direction, and the other end of the pawl is in contact with the ratchet teeth.

[0020] According to some embodiments of the present invention, the pawl includes a first part, a second part and a third part, the first part is located radially inside the second part and the third part and is connected to one end portion of the second part and one end portion of the third part, the second part and the third part are spaced apart along the axial direction to define an opening groove together with the outer side surface of the first part; the first part is rotatably disposed in the pawl groove, and the tower base also includes an annular wire spring, which is arranged around the flywheel seat body and passes through a plurality of the opening grooves, and the annular wire spring abuts against the first part of the pawl so that the other end portions of the second part and the other end portions of the third part abut against the ratchet.

[0021] According to some embodiments of the present invention, a second bearing is disposed in the ratchet wheel, and the second bearing is located on a side of the other end of the flywheel seat body that is away from the connecting portion.

[0022] The electric bicycle drive assembly according to an embodiment of the present invention includes a driving member and the freewheel hub of the above embodiment, and the connecting portion is disposed inside the housing of the driving member and connected to the housing. Since the electric bicycle drive assembly is provided with the freewheel hub of the above embodiment, it is beneficial to obtain a smaller volume and a higher output power.

[0023] The electric bicycle according to an embodiment of the present invention includes the electric bicycle drive assembly of the above embodiment. Since the electric bicycle is provided with the electric bicycle drive assembly of the above embodiment, it is lighter in weight and faster in riding speed.

[0024] The additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic structural diagram of an electric bicycle drive assembly according to an embodiment of the present invention.

[0027] Figure 2 is an exploded structural view of a freewheel hub according to an embodiment of the present invention.

[0028] Figure 3 is a schematic structural diagram of a freewheel seat in a freewheel hub according to an embodiment of the present invention.

[0029] Figure 4 is a sectional view of a freewheel seat in a freewheel hub according to an embodiment of the present invention.

[0030] Figure 5 is a schematic structural diagram of a ratchet in a freewheel hub according to an embodiment of the present invention.

[0031] Figure 6 is Figure 5 the C-C sectional view in

[0032] Figure 7 is Figure 1 the partial enlarged view of part A in

[0033] Figure 8 is Figure 1 the partial enlarged view of part B in

[0034] Figure 9 is a schematic structural diagram of a pawl in a freewheel hub according to an embodiment of the present invention.

[0035] Figure 10 is Figure 9 the D-D sectional view in

[0036] Figure 11 is a sectional view of the tower base according to an embodiment of the present invention.

[0037] Figure 12 is a schematic structural diagram of an electric bicycle according to an embodiment of the present invention.

[0038] Reference numerals:

[0039] Tower base 100;

[0040] Flywheel seat 10;

[0041] Flywheel seat body 101; First shaft hole section 1011; Second shaft hole section 1012; First ring groove 1013;

[0042] Groove body 1014; Pawl groove 1015; Arc groove 1016; Connecting part 102; Concave part 103;

[0043] First wall surface 1031; Second wall surface 1032;

[0044] Driving part 20; Housing 201; First bearing 30; Ratchet 40;

[0045] Fourth ring groove 401; Ratchet teeth 402; Mounting part 403; Spline groove 404; Second ring groove 405;

[0046] Ring part 50; Third ring groove 501; Ball 60; Washer 70; Seal 80; Pawl 90;

[0047] First part 901; Second part 902; Third part 903; Open slot 904; Annular wire spring 110;

[0048] Second bearing 120;

[0049] Electric bicycle drive assembly 200; Electric bicycle 300; First spacing a; Axial thickness b. Detailed implementation manners

[0050] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0052] In the description of the present invention, the "first feature" and "second feature" may include one or more of such features. The meaning of "a plurality" is two or more. The first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. The first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0053] The following describes the tower base 100 according to an embodiment of the present invention with reference to the drawings.

[0054] Refer to Figure 12 As shown, the tower base 100 according to an embodiment of the present invention is provided on an electric bicycle. The electric bicycle 300 is provided with a driving member 20, and the driving member 20 can drive the electric bicycle 300 to move forward; alternatively, the driving member 20 can drive the electric bicycle 300 to move forward or backward. The tower base 100 is used to mount a flywheel assembly, and the tower base 100 can play a role in transmitting torque so that the flywheel assembly can drive the electric bicycle 300 to move forward.

[0055] Refer to Figures 1 to 11 As shown, the tower base 100 according to an embodiment of the present invention may include a flywheel seat 10 and a first bearing 30. The flywheel seat 10 can rotate around its own axis under the drive of the driving member 20 of the electric bicycle 300. The flywheel seat 10 includes a flywheel seat body 101 and a connecting portion 102. The connecting portion 102 is connected to one end of the outer peripheral surface of the flywheel seat body 101 and is used to connect with the driving member 20. A concave portion 103 is provided on the outer peripheral surface of the flywheel seat body 101. In the axial direction, the concave portion 103 is located between the other end surface of the flywheel seat body 101 away from the connecting portion 102 and the connecting portion 102. One end surface of the concave portion 103 close to the connecting portion 102 is a first wall surface 1031; the first bearing 30 is sleeved in the flywheel seat body 101, and the circumferential side wall of the first bearing 30 is located radially inside the first wall surface 1031.

[0056] Specifically, the flywheel seat 10 can rotate around its own axis under the drive of the driving member 20 of the electric bicycle 300. That is to say, the flywheel seat 10 is fixedly connected to the output end of the driving member 20 of the electric bicycle 300. The flywheel seat 10 and the output end of the driving member 20 of the electric bicycle can rotate synchronously. The torque of the output end of the driving member 20 of the electric bicycle 300 can be transmitted to the flywheel seat 10, and the torque on the flywheel seat 10 can also be transmitted to the output end of the driving member 20 of the electric bicycle 300. More specifically, the driving member 20 can be a hub motor, or a combination of a hub motor and a speed reducer, or other motors. As long as the driving member 20 can drive the bicycle wheel to rotate, there is no specific limitation here.

[0057] The flywheel seat 10 includes a flywheel seat body 101 and a connecting portion 102. The connecting portion 102 is connected to one end of the outer peripheral surface of the flywheel seat body 101 and is used to connect to the driving member 20. That is to say, the flywheel seat 10 is connected to the driving member 20 through the connecting portion 102 on the outer peripheral surface of the flywheel seat body 101. More specifically, the connecting portion 102 can be a connecting flange, or the connecting portion 102 can also be a plurality of connecting blocks arranged at intervals along the circumferential direction of the flywheel seat body 101, or the connecting portion 102 is an annular wall body surrounding the flywheel seat body 101, and the outer peripheral surface of the annular wall body is provided with threads for threaded connection with the driving member 20.

[0058] A concave portion 103 is provided on the outer peripheral surface of the flywheel seat body 101. In the axial direction, the concave portion 103 is located between the other end face of the flywheel seat body 101 away from the connecting portion 102 and the connecting portion 102. One end face of the concave portion 103 close to the connecting portion 102 is the first wall surface 1031. The concave portion 103 is arranged around the flywheel seat body 101. The concave portion 103 is an annular concave portion, and the first wall surface 1031 is an annular surface. It should be noted that the freewheel hub 100 further includes a ratchet 40. The ratchet 40 is sleeved outside the flywheel seat body 101. By providing the concave portion 103 on the outer peripheral surface of the flywheel seat body 101, the concave portion 103 can be used to accommodate the seal 80 to seal the gap between the outer peripheral surface of the flywheel seat body 101 and the inner peripheral surface of the ratchet 40, so as to reduce the possibility of dust, water, etc. entering between the ratchet 40 and the flywheel seat body 101. Providing the concave portion 103 on the outer peripheral surface of the flywheel seat body 101 has lower processing difficulty.

[0059] The first bearing 30 is sleeved inside the flywheel seat body 101. It should be noted that a shaft rod can be passed through the flywheel seat body 101. The flywheel seat body 101 is rotatably supported on the shaft rod through the first bearing 30. The first bearing 30 is completely located inside the flywheel seat body 101 to provide a better supporting effect on the flywheel seat body 101. For example, as Figure 1As shown, the end face of the other end of the first bearing 30 is flush with the end face of the flywheel seat body 101 near one end of the connecting portion 102; or, in the axial direction, the distance between the end face of the other end of the first bearing 30 and the axial end face of the flywheel seat body 101 near the connecting portion 102 is less than one-tenth of the axial thickness b of the first bearing 30. For example, in the axial direction, the distance between the end face of the other end of the first bearing 30 and the axial end face of the flywheel seat body 101 can be one-tenth or one-twentieth, etc. of the axial thickness b of the first bearing 30. Here, the end face of the other end of the first bearing 30 refers to the end face of one end of the first bearing 30 that is far from the other end of the flywheel seat body 101 in the axial direction.

[0060] Here, the side close to the central axis of the flywheel seat body 101 is the radial inner side, and the side far from the central axis of the flywheel seat body 101 is the radial outer side.

[0061] As Figure 1 shown, the circumferential side wall of the first bearing 30 is located on the radial inner side of the first wall surface 1031, that is to say, the outer diameter of the first bearing 30 is reduced. It should be noted that generally, the outer diameter and axial thickness of a standard bearing are in direct proportion. When any one of the outer diameter and axial thickness of a standard bearing increases or decreases, the other dimension of the outer diameter and axial thickness of the standard bearing will also increase or decrease accordingly. The outer diameter of the first bearing 30 in the present invention is reduced, and correspondingly, the axial thickness b of the first bearing 30 is also reduced. In this way, in the axial direction, the volume of the part of the axial end of the flywheel seat body 101 located between the axial end face of the flywheel seat body 101 and the connecting portion 102 can be smaller. At the same time, the minimum wall thickness of the flywheel seat body 101 will not be too small, so as to reduce the influence on the structural strength of the flywheel seat body 101.

[0062] It should be noted that in the related art, when the connecting portion is connected to the driving member, the axial end of the flywheel seat body faces the driving member, and the part of the axial end of the flywheel seat body located between the axial end face of the flywheel seat body and the connecting portion is located inside the driving member, which will occupy the internal space of the driving member. By reducing the outer diameter of the first bearing 30 in the present invention, the axial thickness b of the first bearing 30 can be shortened, and further, the part of the axial end of the flywheel seat body 101 located between the axial end face of the flywheel seat body 101 and the connecting portion 102 can be shorter, that is, the axial length of the part of the axial end of the flywheel seat body 101 located inside the driving member 20 can be shorter. Thus, the part of the axial end of the flywheel seat body 101 occupies less internal space of the driving member 20, which is beneficial to reducing the volume of the driving member 20, or arranging more components in the driving member 20 to improve the power of the driving member 20.

[0063] According to the tower base 100 of an embodiment of the present invention, the circumferential side wall of the first bearing 30 in the tower base 100 is located radially inside the first wall surface 1031, that is, the outer diameter of the first bearing 30 is smaller, so that the axial thickness b of the first bearing 30 is smaller. Correspondingly, the axial length of the end portion of the flywheel seat body 101 located inside the driving member 20 at one axial end can be shorter, so that the end portion of the flywheel seat body 101 at one axial end occupies less internal space of the driving member 20, which is beneficial to reducing the size of the driving member 20, or arranging more components in the driving member 20 to improve the power of the driving member 20. At the same time, the axial dimension of the tower base 100 can also be reduced, making the volume of the tower base 100 smaller. In addition, it also makes the minimum wall thickness of the flywheel seat body 101 not too small, thereby reducing the impact on the structural strength of the flywheel seat body 101.

[0064] In some embodiments, the inner diameter of the first bearing 30 remains unchanged. In this way, there is no need to improve the structure of the shaft rod to avoid reducing the structural strength of the shaft rod, and at the same time, the shaft rod can pass through the flywheel seat body 101 without being affected.

[0065] According to some embodiments of the present invention, as Figure 1 shown, in the axial direction, one end face of the first bearing 30 is located on the side of the first wall surface 1031 away from the connecting portion 102. Here, one end face of the first bearing 30 refers to the end face of the first bearing 30 close to the other end portion of the flywheel seat body 101 in the axial direction. That is to say, the arrangement position of the first bearing 30 is closer to the other end face of the flywheel seat body 101, so that the distance between one axial end face of the flywheel seat body 101 and the connecting portion 102 can be reduced or reduced to zero, that is, the axial length of the end portion of the flywheel seat body 101 located inside the driving member 20 at one axial end can be shorter, thus occupying less internal space of the driving member 20, which is beneficial to reducing the size of the driving member 20, or arranging more components in the driving member 20 to improve the power of the driving member 20.

[0066] It should be noted that since the circumferential side wall of the first bearing 30 is located radially inside the first wall surface 1031, in the axial direction, the end face of the first bearing 30 far from one axial end of the flywheel seat body 101 can be located on the side of the first wall surface 1031 away from the connecting portion 102, and at the same time, the minimum wall thickness of the flywheel seat body 101 is not too small to ensure that the local structural strength of the flywheel seat body 101 is not too low.

[0067] In some embodiments, in the axial direction, the end face of the first bearing 30 away from one axial end of the flywheel seat body 101 may also be located on the side of the first wall surface 1031 close to the connecting portion 102 (not shown in the figure). In this way, compared with the end face of the first bearing 30 away from one axial end of the flywheel seat body 101 being located on the side of the first wall surface 1031 away from the connecting portion 102, the minimum wall thickness of the flywheel seat body 101 is relatively larger and the structural strength is relatively better.

[0068] According to some embodiments of the present invention, as Figure 1 shown, in the axial direction, the distance between the end face of the flywheel seat body 101 close to the connecting portion 102 and the connecting portion 102 is the first distance a, and the ratio of the axial dimension of the connecting portion 102 to the first distance a is greater than or equal to 4. That is to say, the first distance a is much smaller than the axial dimension of the connecting portion 102. In this way, the part of the axial end of the flywheel seat body 101 located between the end face of the flywheel seat body 101 and the connecting portion 102 occupies less internal space of the driving member 20 or does not occupy the internal space of the driving member 20. For example, the ratio of the axial dimension of the connecting portion 102 to the first distance a can be 4, 5, 6, 7, 8, 10, 12 or infinity or any value between any two of them.

[0069] According to some embodiments of the present invention, as Figure 1 shown, in the axial direction, the distance between the end face of the flywheel seat body 101 close to the connecting portion 102 and the connecting portion 102 is the first distance a, and the first distance a is less than or equal to 1 mm. In this way, the part of the axial end of the flywheel seat body 101 located between the end face of the flywheel seat body 101 and the connecting portion 102 is as short as possible, and at the same time, the minimum wall thickness of the flywheel seat body 101 is not too small, so that the structural strength of the flywheel seat body 101 meets the use requirements. For example, the first distance a can be 1 mm, 0.8 mm, 0.6 mm, 0.4 mm, 0.2 mm, 0 mm or any value between any two of them.

[0070] According to some embodiments of the present invention, referring to Figure 1 and Figure 4 , the flywheel seat body 101 has a first shaft hole section 1011 and a second shaft hole section 1012 that are connected and communicate with each other, and the aperture of the second shaft hole section 1012 is larger than the aperture of the first shaft hole section 1011, as Figure 1As shown, the first bearing 30 is disposed within the second shaft hole section 1012, and the outer peripheral surface of the first bearing 30 abuts (or is in interference fit) against the inner peripheral surface of the second shaft hole section 1012. The inner peripheral surface of the second shaft hole section 1012 is located radially inward of the first wall surface 1031 and is spaced apart from the first wall surface 1031. By arranging the first bearing 30 through the second shaft hole section 1012, the aperture of the first shaft hole section 1011 is smaller. In this way, compared with the aperture of the first shaft hole section 1011 being larger than the inner diameter of the first bearing 30, or the first shaft hole section 1011 being greater than or equal to the inner diameter of the second shaft hole section 1012, the aperture of the first shaft hole section 1011 being smaller than that of the second shaft hole section 1012 is conducive to minimizing the outer diameter size of the flywheel seat body 101, and further conducive to reducing the component sizes and masses of components such as the ratchet 40 mounted on the flywheel seat 10.

[0071] As Figure 1 shown, the inner peripheral surface of the second shaft hole section 1012 is located radially inward of the first wall surface 1031 and is spaced apart from the first wall surface 1031, that is, the outer peripheral surface of the first bearing 30 is located radially inward of the first wall surface 1031 and is spaced apart from the first wall surface 1031, thereby facilitating the reduction of the axial dimension of the portion of the end of one axial end of the flywheel seat body 101 located between the axial end face of the flywheel seat body 101 and the connecting portion 102, and further facilitating the reduction of the occupancy of the internal space of the driving member 20 by the end of one axial end of the flywheel seat body 101.

[0072] In some embodiments, as Figure 1 shown, the aperture of the first shaft hole section 1011 is smaller than the inner diameter of the first bearing 30. In this way, the requirement of facilitating the insertion of the shaft rod can be met, and at the same time, the outer diameter size of the flywheel seat body 101 can also be minimized. However, this is not limited thereto, and the aperture of the first shaft hole section 1011 can also be larger than the inner diameter of the first bearing 30, or greater than or equal to the inner diameter of the second shaft hole section 1012.

[0073] According to some embodiments of the present invention, the axial end face of the second shaft hole section 1012 close to the first shaft hole section 1011 abuts against the axial end face of the first bearing 30, and is located on the side of the first wall surface 1031 facing away from the connecting portion 102 in the axial direction. Among them, compared with the axial end face of the second shaft hole section 1012 close to the first shaft hole section 1011 being spaced apart from the axial end face of the first bearing 30, the axial end face of the second shaft hole section 1012 close to the first shaft hole section 1011 abuts against the axial end face of the first bearing 30, so that the structural arrangement on the first flywheel seat body 101 is more compact, reducing the possibility of an increase in the axial dimensions of the first flywheel seat body 101 and the tower base 100, and at the same time, the minimum wall thickness of the flywheel seat body 101 will not be too thin.

[0074] The axial end face of the second shaft hole section 1012 close to the first shaft hole section 1011 abuts against the axial end face of the first bearing 30, and is located on the side of the first wall surface 1031 away from the connecting portion 102 in the axial direction. That is to say, in the axial direction, the end face of the first bearing 30 away from the axial end of the flywheel seat body 101 is located on the side of the first wall surface 1031 away from the connecting portion 102, that is, the arrangement position of the first bearing 30 is closer to the other end face of the flywheel seat body 101, so that the distance between the axial end face of the flywheel seat body 101 and the connecting portion 102 can be reduced or reduced to zero, that is, the axial length of the part of the axial end of the flywheel seat body 101 located inside the driving member 20 can be shorter, thus occupying less internal space of the driving member 20, and further being beneficial to reducing the size of the driving member 20, or arranging more components in the driving member 20 to improve the power of the driving member 20.

[0075] More specifically, as Figure 1 shown, the axial end face of the second shaft hole section 1012 close to the first shaft hole section 1011 abuts against the part of the axial end face of the first bearing 30 close to the radially outer side and abuts against the part of the axial end face of the first bearing 30 close to the radially inner side.

[0076] According to some embodiments of the present invention, as Figure 1 and Figure 11 shown, the tower base 100 further includes a ratchet wheel 40. The ratchet wheel 40 is sleeved outside the flywheel seat body 101, and the end face of the axial end of the ratchet wheel 40 close to the connecting portion 102 is arranged opposite to the first wall surface 1031. That is to say, at least part of the end of the axial end of the ratchet wheel 40 close to the connecting portion 102 is located inside the concave portion 103, and at least part of the positive projection of the end face of the axial end of the ratchet wheel 40 close to the connecting portion 102 and the first wall surface 1031 in the axial direction coincides. In this way, the spatial arrangement of the ratchet wheel 40 and the flywheel seat body 101 is more compact, the radial dimension of the tower base 100 is smaller, and correspondingly, the mass of the tower base 100 is lighter.

[0077] According to some embodiments of the present invention, referring to Figures 1 to 4 shown, the outer peripheral wall of the flywheel seat body 101 is provided with a first annular groove 1013 connected to the concave portion 103, the inner peripheral wall of the ratchet wheel 40 is provided with a second annular groove 405, and the first annular groove 1013 and the second annular groove 405 define a first raceway for accommodating the ball 60. The first annular groove 1013 is located on the axial side of the first bearing 30, and the inner diameter of the first annular groove 1013 is smaller than the outer diameter of the first bearing 30; the tower base 100 further includes an annular member 50. The annular member 50 is sleeved outside the axial end of the other end of the flywheel seat body 101 and is detachably connected to the flywheel seat body 101. The outer peripheral wall of the annular member 50 is provided with a third annular groove 501; the inner peripheral wall of the ratchet wheel 40 is provided with a fourth annular groove 401, and the third annular groove 501 and the fourth annular groove 401 define a second raceway for accommodating the ball 60 (asFigure 7 as shown

[0078] It should be noted that, as Figure 1 and Figure 2 shown, a plurality of balls 60 are arranged in sequence along the circumferential direction in both the first raceway and the second raceway. The plurality of balls 60 cooperate with the first raceway and the second raceway to realize the axial limit of the ratchet 40 and the flywheel seat body 101, so that the ratchet 40 and the flywheel seat body 101 will not be disengaged from each other axially; at the same time, the balls 60 also play a supporting role, so that the ratchet 40 and the flywheel seat body 101 are spaced apart radially.

[0079] During installation, first, the ratchet 40 is sleeved outside the flywheel seat body 101, the balls 60 are placed in the second annular groove 405, and the ratchet 40 is moved along the flywheel seat body 101 to a proper position so that the second annular groove 405 on the ratchet 40 cooperates with the first annular groove 1013 to form the first raceway; then the balls 60 are placed in the fourth annular groove 401, and finally the annular member 50 and the flywheel seat body 101 are connected so that the third annular groove 501 and the fourth annular groove 401 form the second raceway.

[0080] More specifically, an external thread is provided on the outer peripheral surface of the axial other end of the flywheel seat body 101, and an internal thread is provided on the inner side wall of the annular member 50. The annular member 50 is threadedly connected to the flywheel seat body 101. However, this is not limited thereto. Other detachable connection methods may also be adopted between the annular member 50 and the flywheel seat body 101. For example, the annular member 50 is snap-fitted and fixed to the flywheel seat body 101.

[0081] As Figure 1 shown, the first annular groove 1013 is located on one side of the first bearing 30 axially away from the axial end of the flywheel seat body 101, that is to say, the first bearing 30 is axially closer to the axial end of the flywheel seat body 101. In this way, the supporting effect of the first bearing 30 on the flywheel seat body 101 is better.

[0082] As Figure 1 shown, the inner diameter of the first annular groove 1013 is smaller than the outer diameter of the first bearing 30. In this way, the difference between the outer diameter and the inner diameter of the first bearing 30 will not be too small to ensure the service performance of the first bearing 30. It should be noted that here, the inner diameter of the first annular groove 1013 refers to twice the minimum distance between the inner wall surface of the first annular groove 1013 and the central axis of the flywheel seat body 101.

[0083] According to some embodiments of the present invention, as Figure 1 and Figure 2As shown, the flywheel seat body 101 has a groove 1014 for accommodating the annular member 50. Compared with directly sleeving the annular member 50 on the outer peripheral wall of the flywheel seat body 101, by providing the groove 1014 to accommodate the annular member 50, it is beneficial to reduce the radial dimension of the corresponding part between the ratchet 40 and the annular member 50, thereby facilitating the reduction of the mass and production cost of the freehub body 100.

[0084] According to some embodiments of the present invention, as Figure 1 , Figure 7 shown, a washer 70 is provided between one end face of the groove 1014 in the axial direction and the annular member 50, and the other end of the groove 1014 in the axial direction is open to facilitate inserting the annular member 50 into the groove 1014 or removing it from the groove 1014. By providing the washer 70, the distance between one end face of the groove 1014 in the axial direction and the annular member 50 in the axial direction can be adjusted by adjusting the axial thickness of the washer 70, thereby adjusting the pressing force between the ball 60 and the first raceway and the second raceway, so as to adjust the smoothness of rotation between the ratchet 40 and the flywheel seat body 101. At the same time, the requirements for the machining accuracy of the first annular groove 1013, the second annular groove 405, the third annular groove 501, and the fourth annular groove 401 can also be reduced, improving production efficiency. More specifically, the washer 70 is a hard washer. For example, the washer 70 can be a steel washer or an iron washer, etc.

[0085] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 and Figure 4 shown, the recess 103 further includes a second wall surface 1032, and the second wall surface 1032 has a set angle with the first wall surface 1031. For example, the set angle can be an acute angle or a right angle, such as 90°, 87°, 85°, 80°, 75°, etc., and no specific limitation is made here. A seal 80 is provided between the second wall surface 1032 and the inner peripheral surface of the ratchet 40, and the seal 80 is used to seal the gap between the second wall surface 1032 and the inner peripheral surface of the ratchet 40, which can reduce the possibility of dust, water, etc. entering between the ratchet 40 and the flywheel seat body 101 and into the first raceway, ensuring the long-term use effect of the freehub body 100. More specifically, the first seal 80 can be an elastic seal, such as a rubber part, a silicone part, etc.

[0086] In some embodiments, as Figure 8 shown, the seal 80 is connected to one of the flywheel seat body 101 and the ratchet 40, and the seal 80 includes a sealing lip, and the sealing lip is in sealing fit with the other of the flywheel seat body 101 and the ratchet 40. The flywheel seat body 101 and the ratchet 40 rotate relative to each other, and providing the seal 80 including the sealing lip is beneficial to ensuring the sealing effect when the flywheel seat body 101 and the ratchet 40 rotate relative to each other.

[0087] In some embodiments, such as Figure 1 and Figure 2 shown, a first annular groove 1013 connected to the recess 103 is provided on the outer peripheral wall of the flywheel seat body 101. The recess 103 includes a first wall surface 1031 and a second wall surface 1032. The second wall surface 1032 has a set angle with the first wall surface 1031. The second wall surface 1032 is located on the side of the first wall surface 1031 axially away from the connecting portion 102, and the second wall surface 1032 is connected to the first annular groove 1013. In this way, the structural arrangement is more reasonable and the use effect is good.

[0088] According to some embodiments of the present invention, referring to Figure 2 and Figures 9 to 11 shown, the tower base 100 further includes a plurality of pawls 90. Referring to Figure 3 , the flywheel seat body 101 is provided with a plurality of pawl grooves 1015 spaced apart circumferentially. Referring to Figure 11 shown, the plurality of pawls 90 are correspondingly arranged in the plurality of pawl grooves 1015. One end of the pawl 90 is rotatably arranged in the pawl groove 1015. Referring to Figure 5 and Figure 6 and Figure 11 , the inner peripheral wall of the ratchet wheel 40 has a plurality of ratchet teeth 402 arranged in sequence circumferentially, and the other end of the pawl 90 abuts against the ratchet teeth 402.

[0089] Please refer to Figure 11 shown. In the state where the flywheel seat body 101 rotates relative to the ratchet wheel 40 in the clockwise direction in the figure, for example, the flywheel seat body 101 rotates and the ratchet wheel 40 does not rotate, or the rotation speed of the flywheel seat body 101 is greater than the rotation speed of the ratchet wheel 40. At this time, the flywheel seat body 101 drives the pawl 90 to rotate relative to the ratchet wheel 40, and the abutting direction between the ratchet teeth 402 of the ratchet wheel 40 and the pawl 90 is only along the radial direction of the flywheel seat body 101, and the ratchet wheel 40 cannot drive the flywheel seat body 101 to rotate through the pawl 90. Or, the ratchet wheel 40 rotates in the counterclockwise direction in the figure. At this time, the ratchet wheel 40 cannot drive the flywheel seat body 101 to rotate through the pawl 90.

[0090] In the state where the ratchet wheel 40 rotates relative to the flywheel seat body 101 in the clockwise direction in the figure, for example, the driving member 20 does not drive the flywheel seat body 101 to rotate, or the rotation speed of the driving member 20 driving the flywheel seat body 101 to rotate is less than the state where the ratchet wheel 40 rotates in the clockwise direction in the figure. At this time, the abutting direction between the ratchet teeth 402 of the ratchet wheel 40 and the pawl 90 includes the radial direction of the flywheel seat body 101 and the tangential direction of rotation at the corresponding position of the ratchet wheel 40. Thus, the ratchet wheel 40 can drive the flywheel seat body 101 to rotate through the pawl 90, that is, at this time, torque is input from the ratchet wheel 40 to the flywheel seat body 101 to drive the electric bicycle 300 to move forward.

[0091] Thus, the freewheel base 100 can transmit torque in one direction when the freewheel base 100 is stepped on manually, and the freewheel base 100 does not transmit torque when the freewheel base 100 is gliding or driven by a motor. The ratchet 90 can be connected to the flywheel seat body 101 through an elastic member so that the other end of the ratchet 90 abuts against the ratchet tooth 402.

[0092] According to some embodiments of the present invention, referring to Figure 9 and Figure 10 The pawl 90 includes a first portion 901, a second portion 902 and a third portion 903. The first portion 901 is located radially inside the second portion 902 and the third portion 903 and is connected to one end of the second portion 902 and one end of the third portion 903. The second portion 902 and the third portion 903 are arranged spaced apart in the axial direction to define an opening groove 904 together with the outer side surface of the first portion 901. The first portion 901 is rotatably disposed in the pawl groove 1015. The freewheel base 100 also includes an annular wire spring 110, which is arranged around the flywheel seat body 101 and penetrates through a plurality of opening grooves 904. The annular wire spring 110 abuts against the first portion 901 of the pawl 90 so that the other end of the second portion 902 and the other end of the third portion 903 abut against the ratchet 40. That is, the annular wire spring 110 is used to provide an elastic contraction force so that the pawl 90 can be tightly pressed against the ratchet 40. As the contact position between the pawl 90 and the inner circumferential wall of the ratchet wheel 40 changes, the pawl 90 rotates.

[0093] More specifically, the first portion 901 and the portion facing the pawl groove 1015 may be arc-shaped, spherical or similar arc-shaped surfaces, for example, a plurality of planes with smaller widths are continuously arranged along a curve to form a similar arc-shaped surface, so that the first portion 901 can rotate relative to the pawl groove 1015, but is not limited thereto, for example, the first portion 901 may also be spaced apart from the pawl groove 1015 and rotatably connected to the pawl groove 1015 via a rotating shaft. The annular wire spring 110 will compress the first portion 901 so that the other ends of the second portion 902 and the third portion 903 are tilted outwards and abut against the ratchet 40.

[0094] In a specific embodiment, Figure 10 As shown, the first portion 901 is semi-cylindrical, and the second portion 902 and the third portion 903 are strip-shaped.

[0095] In some embodiments, Figure 10 As shown, the angle θ between the outer side surface of the first part 901 and the inner side surface of the other end of the second part 902 or the other end of the third part 903 is 10° to 20°. In this way, the contact force between the pawl 90 and the ratchet 40 will not be too large or too small, so as to ensure that the freewheel base 100 has a better use effect.

[0096] In some embodiments, reference Figure 3The portion of the circumferential side wall of the flywheel seat body 101 corresponding to the adjacent pawl grooves 1015 is provided with an arc groove 1016, which extends along the circumference of the flywheel seat body 101 and connects the adjacent pawl grooves 1015. The annular wire spring 110 is penetrated by a plurality of arc grooves 1016 and a plurality of opening grooves 904 and arranged around the flywheel seat body 101. The arc groove 1016 can limit the annular wire spring 110, so that the annular wire spring 110 is not easy to move in the axial direction.

[0097] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, a second bearing 120 is provided in the ratchet 40, and the second bearing 120 is located at the side of the other end of the flywheel seat body 101 away from the connecting portion 102. The second bearing 120 abuts against the circumferential inner wall of the ratchet 40, and the freewheel base 100 is supported on the shaft rod through the first bearing 30 and the second bearing 120, so that the freewheel base 100 is stably supported on the shaft rod, and the friction between the shaft rod and the freewheel base 100 is rolling friction.

[0098] In some embodiments, the second bearing 120 is located on the side of the second raceway away from the connecting portion 102 in the axial direction. In this way, the second bearing 120 can also play a sealing role, reducing the possibility of water and dust entering the second raceway and the gap between the circumferential outer side of the flywheel seat body 101 and the circumferential inner side of the ratchet 40.

[0099] In some embodiments, Figure 1 As shown, the axial dimension d of the freewheel base 100 is less than or equal to 47 mm, or in other words, the axial distance between the end face of one axial end of the flywheel seat 10 and the end face of the other axial end of the ratchet 40 is less than or equal to 47 mm. In other words, the axial dimension d of the freewheel base 100 is shorter.

[0100] In some embodiments, the outer peripheral wall of the ratchet 40 is provided with a spline groove 404, the spline groove 404 extends in the axial direction, and the distance c between one end of the spline groove 404 close to the connecting portion 102 in the axial direction and the other end face of the ratchet 40 is greater than or equal to 34 mm. In other words, corresponding to different types of freehubs, or freehubs of different models of wheels, the axial dimension of the freehub 100 can also be longer.

[0101] like Figure 1 As shown, the electric bicycle driving assembly 200 according to the embodiment of the present invention comprises a driving member 20 and the freewheel base 100 of the above embodiment. Since the electric bicycle driving assembly 200 is provided with the freewheel base 100 of the above embodiment, it is beneficial to obtain a smaller volume and higher output power.

[0102] According to some embodiments of the present invention, Figure 1As shown, the connecting portion 102 is disposed within the housing 201 of the driving member 20 and is connected to the housing 201. It should be noted that generally, the wall thickness of the housing 201 of the driving member 20 is relatively small, and the axial dimension of the connecting portion 102 is relatively large. Therefore, the bolt needs to be first passed through the housing 201 and then connected to the bolt hole of the connecting portion 102. In an embodiment where the connecting portion 102 is disposed outside the housing 201 of the driving member 20, the bolt needs to be first placed inside the housing 201 and then passed outwards to be connected to the connecting portion 102. When the bolt becomes loose, the bolt will fall inside the housing 201, which may directly damage the driving member 20. By disposing the connecting portion 102 within the housing 201 of the driving member 20 and connecting it to the housing 201, in this way, when the bolt is installed, it will be passed through in the direction close to the inside of the housing 201 and connected to the connecting portion 102. When the bolt becomes loose, the bolt will fall outside the housing 201, so as not to damage the components inside the housing 201 of the driving member 20, thereby improving the use safety of the driving member 20.

[0103] According to some embodiments of the present invention, the electric bicycle drive assembly 200 further includes a freewheel assembly. The freehub body 100 includes a ratchet 40. An installation portion 403 is provided at one end of the ratchet 40 in the axial direction and away from the connecting portion 102. The installation portion 403 is used for connecting with the freewheel assembly. For example, the inner peripheral surface of the installation portion 403 is provided with threads, and the freewheel assembly is threadedly connected to the installation portion 403.

[0104] As Figure 12 As shown, the electric bicycle 300 according to an embodiment of the present invention includes the electric bicycle drive assembly 200 of the above embodiment. Since the electric bicycle 300 according to the embodiment of the present invention is provided with the electric bicycle drive assembly 200 of the above embodiment, therefore, it is lighter in weight and faster in riding speed.

[0105] Next, the freehub body 100 according to a specific embodiment of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the following description is only an exemplary illustration and cannot be construed as a limitation of the invention.

[0106] A freehub body 100 is disposed on an electric bicycle 300. The freehub body 100 includes a ratchet 40, a freewheel carrier 10, a first bearing 30, a second bearing 120, and a plurality of pawls 90. The freewheel carrier 10 can rotate around its own axis under the drive of the driving member 20 of the electric bicycle 300. The axial dimension d of the freehub body 100, or rather, the distance in the axial direction from one axial end of the freewheel carrier 10 to the other axial end of the ratchet 40 can be 47 mm.

[0107] The freewheel carrier 10 includes a freewheel carrier body 101 and a connecting portion 102. The connecting portion 102 is connected to one end of the outer peripheral surface of the freewheel carrier body 101 in the axial direction and is used for connecting with the driving member 20. The connecting portion 102 is a connecting flange. The connecting flange is disposed within the housing 201 of the driving member 20 and is connected to the housing 201.

[0108] The outer peripheral surface of the flywheel seat body 101 is provided with a recess 103. The recess 103 is located on the side of the connecting portion 102 in the axial direction and close to the other axial end of the flywheel seat body 101. The end face of the recess 103 close to the axial end of the connecting portion 102 is the first wall surface 1031. The first bearing 30 is sleeved in the flywheel seat body 101. The flywheel seat body 101 has a first shaft hole section 1011 and a second shaft hole section 1012 that are communicated with each other. The aperture of the second shaft hole section 1012 is larger than that of the first shaft hole section 1011. The first bearing 30 is arranged in the second shaft hole section 1012 and the outer peripheral surface of the first bearing 30 abuts against the inner peripheral surface of the second shaft hole section 1012. The inner peripheral surface of the second shaft hole section 1012 is located radially inside the first wall surface 1031 and is spaced apart from the first wall surface 1031. The axial end face of the second shaft hole section 1012 close to the first shaft hole section 1011 abuts against the axial end face of the first bearing 30 and is located on the side of the first wall surface 1031 away from the connecting portion 102 in the axial direction. The inner diameter of the first bearing 30 is 15 mm, the outer diameter of the first bearing 30 is 28 mm, and the axial thickness b of the first bearing 30 is 7 mm. In the axial direction, the distance between the axial end face of the flywheel seat body 101 and the connecting portion 102 is the first distance a, and the ratio of the axial dimension of the connecting portion 102 to the first distance a is greater than or equal to 4. In the axial direction, the distance between the axial end face of the flywheel seat body 101 and the connecting portion 102 is the first distance a, and the first distance a is less than or equal to 1 mm.

[0109] The ratchet wheel 40 is sleeved outside the flywheel seat body 101. The end face of the ratchet wheel 40 close to the axial end of the connecting portion 102 is arranged opposite to the first wall surface 1031. The outer peripheral wall of the flywheel seat body 101 is provided with a first annular groove 1013 connected to the recess 103. The inner peripheral wall of the ratchet wheel 40 is provided with a second annular groove 405. The first annular groove 1013 and the second annular groove 405 define a first raceway for accommodating the ball 60. The first annular groove 1013 is located on the side of the first bearing 30 away from the axial end of the flywheel seat body 101 in the axial direction, and the inner diameter of the first annular groove 1013 is smaller than the outer diameter of the first bearing 30. The tower base 100 further includes an annular member 50. The annular member 50 is sleeved outside the end of the other axial end of the flywheel seat body 101 and is threadedly connected to the flywheel seat body 101. The outer peripheral wall of the annular member 50 is provided with a third annular groove 501. The inner peripheral wall of the ratchet wheel 40 is provided with a fourth annular groove 401. The third annular groove 501 and the fourth annular groove 401 define a second raceway for accommodating the ball 60.

[0110] The flywheel seat body 101 has a groove body 1014 for accommodating the annular member 50. A washer 70 is provided between the end face of one axial end of the groove body 1014 and the annular member 50, and the other axial end of the groove body 1014 is open.

[0111] The recessed portion 103 includes a second wall surface 1032 which is perpendicular to the first wall surface 1031. A seal 80 is provided between the second wall surface 1032 and the inner circumferential surface of the ratchet wheel 40, and the seal 80 is used to seal the gap between the second wall surface 1032 and the inner circumferential surface of the ratchet wheel 40.

[0112] The flywheel seat body 101 is provided with a plurality of pawl grooves 1015 which are circumferentially spaced apart. A plurality of pawls 90 are correspondingly arranged in the plurality of pawl grooves 1015. One end of the pawl 90 is rotatably arranged in the pawl groove 1015. The inner circumferential wall of the ratchet wheel 40 has a plurality of ratchet teeth 402 which are arranged in sequence along the circumferential direction. The other end of the pawl 90 abuts against the ratchet tooth 402.

[0113] The pawl 90 includes a first portion 901, a second portion 902 and a third portion 903. The first portion 901 is located radially inside the second portion 902 and the third portion 903 and is connected to one end of the second portion 902 and one end of the third portion 903. The second portion 902 and the third portion 903 are arranged at intervals along the axial direction to jointly define an opening groove 904 with the outer side surface of the first portion 901. The first portion 901 is rotatably arranged in the pawl groove 1015. The tower base 100 further includes an annular wire spring 110. The annular wire spring 110 is arranged around the flywheel seat body 101 and passes through the plurality of opening grooves 904. The annular wire spring 110 abuts against the first portion 901 of the pawl 90 so that the other end of the second portion 902 and the other end of the third portion 903 abut against the ratchet wheel 40.

[0114] The outer circumferential wall of the ratchet wheel 40 is provided with a spline groove 404 which extends axially. The distance c between one end of the spline groove 404 close to the connecting portion 102 and the other end face of the ratchet wheel 40 in the axial direction is 34 mm.

[0115] A second bearing 120 is arranged in the ratchet wheel 40. The second bearing 120 is located on the other axial end of the flywheel seat body 101, on the side far from the connecting portion 102. The shaft rod passes through the first bearing 30, the flywheel seat body 101, the second bearing 120 and the ratchet wheel 40.

[0116] Other configurations and operations of the tower base 100 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0117] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0118] In the description of this specification, the descriptions referring to the terms "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0119] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A tower base, It is characterized in that Provided on an electric bicycle, the tower base comprises: A flywheel seat, wherein the flywheel seat can rotate around its own axis under the drive of the driving member of the electric bicycle, and the flywheel seat comprises a flywheel seat body and a connecting portion, wherein the connecting portion is connected to one end of the outer peripheral surface of the flywheel seat body and is used to connect with the driving member, and a recess is provided on the outer peripheral surface of the flywheel seat body, and in the axial direction, the recess is located between the other end surface of the flywheel seat body away from the connecting portion and the connecting portion, and the end surface of the recess close to the connecting portion is a first wall surface; The first bearing is sleeved in the flywheel seat body, and the circumferential side wall of the first bearing is located radially inside the first wall surface.

2. The tower foundation according to claim 1, It is characterized in that In the axial direction, one end surface of the first bearing is located on a side of the first wall surface away from the connecting portion.

3. The tower foundation according to claim 1, It is characterized in that The other end face of the first bearing is flush with one end face of the flywheel seat body close to the connecting portion; or, in the axial direction, the distance between the other end face of the first bearing and one axial end face of the flywheel seat body close to the connecting portion is less than one tenth of the axial thickness of the first bearing.

4. The tower foundation according to claim 1, It is characterized in that In the axial direction, the distance between an end surface of the flywheel seat body close to the connecting portion and the connecting portion is a first distance, and the ratio of the axial dimension of the connecting portion to the first distance is greater than or equal to 4.

5. The tower foundation according to claim 1, It is characterized in that In the axial direction, a distance between an end surface of the flywheel seat body close to the connecting portion and the connecting portion is a first distance, and the first distance is less than or equal to 1 mm.

6. The tower foundation according to claim 1, It is characterized in that The flywheel seat body has a first shaft hole section and a second shaft hole section that are connected. The aperture of the second shaft hole section is larger than the aperture of the first shaft hole section. The first bearing is arranged in the second shaft hole section and the outer circumferential surface of the first bearing abuts against the inner circumferential surface of the second shaft hole section. The inner circumferential surface of the second shaft hole section is located radially inward of the first wall surface and is spaced apart from the first wall surface.

7. The tower foundation according to claim 6, It is characterized in that The axial end surface of the second shaft hole segment close to the first shaft hole segment abuts against the axial end surface of the first bearing and is located on a side of the first wall surface away from the connecting portion in the axial direction.

8. The tower foundation according to any one of claims 1 to 7, It is characterized in that Also includes: A ratchet wheel is sleeved outside the flywheel seat body, and an end surface of the ratchet wheel close to one axial end of the connecting portion is arranged opposite to the first wall surface.

9. The tower foundation according to claim 8, It is characterized in that The outer circumferential wall of the flywheel seat body is provided with a first annular groove connected to the recess, and the inner circumferential wall of the ratchet is provided with a second annular groove, the first annular groove and the second annular groove define a first raceway for accommodating balls, the first annular groove is located on one axial side of the first bearing, and the inner diameter of the first annular groove is smaller than the outer diameter of the first bearing; the tower base also includes an annular member, which is sleeved on the outer side of the other axial end of the flywheel seat body and is detachably connected to the flywheel seat body, and the outer circumferential wall of the annular member is provided with a third annular groove; the inner circumferential wall of the ratchet is provided with a fourth annular groove, and the third annular groove and the fourth annular groove define a second raceway for accommodating balls.

10. The tower foundation according to claim 9, It is characterized in that The flywheel seat body has a groove body for accommodating the annular member, a gasket is arranged between an end surface of one axial end of the groove body and the annular member, and the other axial end of the groove body is open.

11. The tower foundation according to claim 9, It is characterized in that The recess includes a second wall surface, the second wall surface and the first wall surface have a set angle, a seal is provided between the second wall surface and the inner circumference of the ratchet, and the seal is used to seal the gap between the second wall surface and the inner circumference of the ratchet.

12. The tower foundation according to claim 8, It is characterized in that It also includes a plurality of pawls, the flywheel seat body is provided with a plurality of pawl grooves spaced apart along the circumferential direction, the plurality of pawls are correspondingly arranged in the plurality of pawl grooves, one end of the pawl is rotatably arranged in the pawl groove, the inner circumferential wall of the ratchet wheel has a plurality of ratchet teeth arranged in sequence along the circumferential direction, and the other end of the pawl is in contact with the ratchet teeth.

13. The tower foundation according to claim 12, It is characterized in that The pawl includes a first part, a second part and a third part, the first part is located radially inside the second part and the third part and is connected to one end of the second part and one end of the third part, the second part and the third part are spaced apart along the axial direction to define an opening groove together with the outer side surface of the first part; the first part is rotatably disposed in the pawl groove, and the tower base also includes an annular wire spring, which is arranged around the flywheel seat body and penetrates a plurality of the opening grooves, and the annular wire spring abuts against the first part of the pawl so that the other end of the second part and the other end of the third part abut against the ratchet.

14. The tower foundation according to claim 8, It is characterized in that A second bearing is arranged in the ratchet wheel, and the second bearing is located at a side of the other end of the flywheel seat body away from the connecting portion.

15. An electric bicycle drive assembly, It is characterized in that It comprises a driving member and a tower base according to any one of claims 1 to 14, wherein the connecting portion is arranged in a housing of the driving member and connected to the housing.

16. An electric bicycle, It is characterized in that Includes the electric bicycle drive assembly as described in claim 15.

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