A brushless hub motor for an energy-saving electric bicycle

Abstract

The present invention is applicable to the technical field of in-wheel motors, and provides a brushless in-wheel motor for energy-saving electric bicycles, which includes an in-wheel motor assembly, and a cover assembly is snap-connected to one end of the in-wheel motor assembly; the in-wheel motor assembly includes a wheel hub member and a stator member rotatably fitted on the wheel hub member; the cover assembly includes a first cover member sleeved and fitted on one end of the wheel hub member and a second cover member threadedly rotatably connected to the first cover member. During the use of this brushless in-wheel motor for energy-saving electric bicycles, it can solve the problem that in the existing brushless in-wheel motor for electric bicycles, during the use process, due to the lack of certain auxiliary heat dissipation structures inside, the hot air inside it is difficult to fully contact with the heat dissipation structures during the working process, reducing the heat dissipation performance, and to a certain extent reducing the energy-saving effect of the brushless in-wheel motor for electric bicycles during the use process.

Description

Technical Field

[0001] The present invention relates to the technical field of in-wheel motors, and more specifically, it relates to a brushless in-wheel motor for energy-saving electric bicycles. Background Art

[0002] An electric bicycle is a mechatronic personal transportation vehicle that uses a battery as an auxiliary energy source and is based on an ordinary bicycle, equipped with components such as a motor, a controller, a battery, a throttle grip, a brake lever, and a display instrument system. During the production and assembly of electric bicycles, in-wheel motors are mostly used. In-wheel motor technology, also known as in-wheel motor technology, has the greatest feature of integrating the power, transmission, and braking devices into the wheel hub, greatly simplifying the mechanical part of the electric bicycle.

[0003] Currently, the following technical problems mostly exist in the use of brushless in-wheel motors for electric bicycles:

[0004] During the use of existing brushless in-wheel motors for electric bicycles, due to the lack of a certain auxiliary heat dissipation structure inside the brushless in-wheel motor, when the brushless in-wheel motor is working, the hot air inside it is difficult to fully contact the heat dissipation structure of the brushless in-wheel motor, reducing the heat dissipation performance of the entire brushless in-wheel motor during use, and to a certain extent reducing the energy-saving effect of the brushless in-wheel motor for electric bicycles during use. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a brushless in-wheel motor for energy-saving electric bicycles that can increase the heat dissipation performance of the entire brushless in-wheel motor during use by allowing the internal hot air to fully contact a number of first arc-shaped heat dissipation fins and a number of second arc-shaped fins, and the entire heat dissipation process does not require additional driving energy. Just by the process of the wheel hub and the tire provided on the circumferential side of the wheel hub in the brushless in-wheel motor rotating synchronously on the circumferential side of the rotating shaft, the heat dissipation effect during use can be increased, and to a certain extent, an energy-saving effect can be achieved.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A brushless in-wheel motor for energy-saving electric bicycles includes an in-wheel motor assembly, and a cover body assembly is snap-connected to one end of the in-wheel motor assembly.

[0008] The in-wheel motor assembly includes a wheel hub member and a stator member rotatably fitted on the wheel hub member.

[0009] The cover assembly comprises a first cover member sleeved and fitted on one end of the hub member and a second cover member threadedly connected to the first cover member.

[0010] The hub member includes a hub, a first rotating hole is opened through the inner bottom of the hub, a plurality of first arc-shaped heat sinks distributed in a circumferential array are embedded in the outer bottom of the hub, the plurality of the first arc-shaped heat sinks pass through the outer bottom of the hub, and a motor rotor is fixed to the inner wall of the hub.

[0011] The stator component includes a rotating shaft rotatably engaged in the first rotating hole, a motor stator is arranged on the peripheral side of the rotating shaft, two symmetrical limit grooves are opened on the peripheral side of the rotating shaft, and the two limit grooves are plugged and engaged with limit rails, a sliding sleeve that slides on the rotating shaft is fixed between the two limit rails, a missing gear is fixed on the outer peripheral side of the sliding sleeve, a rotating circular plate is fixed on the outer peripheral side of the sliding sleeve close to the missing gear, and a missing tooth ring is fixed on one side of the rotating circular plate.

[0012] The present invention is further configured as follows: the first cover body comprises a first cover body, a second arc-shaped fin extending outward is embedded in the top of the first cover body, a second rotating hole rotatably engaged with the rotating shaft is penetrated through the top of the first cover body, two symmetrical center shafts are fixed at the top of the first cover body below the second arc-shaped fin, the circumferential side surfaces of the two center shafts are rotatably engaged with the first gear, and the first gear is meshed with the missing gear and the missing tooth ring.

[0013] Turbine blades are fixed to the tops of the two first gears below the second arc-shaped fins.

[0014] The present invention is further configured as follows: the outer top of the first cover body is located above the second rotating hole and is connected to an external threaded cylinder.

[0015] The second cover body comprises a second cover body sleeved and fitted outside the first cover body, and the outer top of the second cover body is connected to an internal threaded cylinder threadedly connected to the outer peripheral side of the external threaded cylinder.

[0016] The present invention is further configured as follows: a plurality of first flow grooves are formed through one side of the rotating circular plate.

[0017] A plurality of first heat dissipation slots are formed through the top of the second cover body, and a plurality of second heat dissipation slots are formed through the side surface of the second cover body.

[0018] The present invention is further configured as follows: a first fitting ring is fixed to the bottom of the second cover body, and a plurality of key slots are formed through the top of the first fitting ring.

[0019] A plurality of positioning blocks are fixed on the outer top of the wheel hub, and a plug-in groove is formed through one side of the plurality of positioning blocks.

[0020] The present invention is further configured such that: a second fitting ring is fixed to the bottom of the first cover body, a plurality of rectangular slots are formed through the outer peripheral side surface of the second fitting ring, a plurality of displacement slots respectively communicating with the rectangular slots are formed on the surfaces of the second fitting ring and the first cover body, a plurality of plugging plates are slidably fitted inside the plurality of rectangular slots, a sliding rod slidably fitted inside the displacement slot is fixed to the top of the plugging plate, and the plurality of sliding rods are respectively slidably fitted with key slots.

[0021] The advantages of the present invention are:

[0022] Through two central axes and the first gears respectively rotatably fitted on the peripheral sides of the two central axes, the present invention synchronously rotates and moves relatively in opposite directions on the peripheral sides of the missing gear and the missing tooth ring respectively, thereby driving the turbine fan blades respectively fixed below the second arc-shaped fins at the tops of the two first gears to synchronously rotate relatively repeatedly, thereby increasing the fluidity of the hot air inside the device during operation, enabling the hot air inside to fully contact with a plurality of first arc-shaped heat dissipation fins and a plurality of second arc-shaped fins, increasing the heat dissipation performance of the entire brushless hub motor during use, and the entire heat dissipation process does not require additional driving energy. Just by the process of the hub and the tire provided on the peripheral side of the hub in the brushless hub motor rotating synchronously on the peripheral side of the rotating shaft, the heat dissipation effect during use can be increased, achieving a certain energy-saving effect to a certain extent and increasing the heat dissipation effect of the entire device.

[0023] Through the threaded connection between the internally threaded cylinder and the externally threaded cylinder communicated with the outer top of the second cover body, the internally threaded cylinder can gradually descend on the outer peripheral side of the externally threaded cylinder, and sequentially drive the plurality of sliding rods to respectively perform radial mutual contraction movements inside the plurality of displacement slots, and finally drive the plugging plates respectively fixed to the bottoms of the plurality of sliding rods to respectively perform radial mutual contraction movements inside the plurality of rectangular slots formed through the outer peripheral side of the second fitting ring until the plurality of plugging plates are plugged and fitted into the plugging slots, thereby completing the installation of the entire first cover body and the second cover body, replacing the original bolt fixed connection method, bringing a certain degree of convenience to the installation process of the staff and facilitating the staff for later installation.

[0024] In the present invention, by reversely rotating the second cover body, the internal thread cylinder connected to the outer top of the second cover body gradually performs reverse thread movement on the circumferential side of the outer thread cylinder, and thus gradually reaches a lifted state, thereby driving the first fitting ring fixed to the bottom of the second cover body to gradually move away from the top of the second fitting ring, enabling the plurality of sliding rods to respectively perform radially expanding movement inside the plurality of displacement grooves, and finally driving the plugging plates respectively fixed to the bottoms of the plurality of sliding rods to respectively perform radially expanding movement inside the plurality of rectangular grooves formed through the outer circumferential side of the second fitting ring until the plurality of plugging plates are removed from the plugging grooves, thereby completing the detachable process of the entire first cover body and the second cover body, replacing the original disassembly method, bringing certain convenience to the disassembly and maintenance process of the staff, and facilitating the staff to perform subsequent disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic structural view of a brushless hub motor for an energy-saving electric bicycle according to the present invention.

[0026] Figure 2 FIG. is a schematic structural view of a hub motor assembly according to the present invention.

[0027] Figure 3 FIG. is a schematic bottom view structural view of a cover body assembly according to the present invention.

[0028] Figure 4 FIG. is a schematic top view structural view of a cover body assembly according to the present invention.

[0029] Figure 5 FIG. is a schematic structural view of a hub part according to the present invention.

[0030] Figure 6 FIG. is a front view of a hub part according to the present invention.

[0031] Figure 7 FIG. is a top view of a hub part according to the present invention.

[0032] Figure 8 FIG. is a schematic structural view of a stator part according to the present invention.

[0033] Figure 9 FIG. is a front view of a stator part according to the present invention.

[0034] Figure 10 FIG. is a schematic bottom view structural view of a first cover body part according to the present invention.

[0035] Figure 11 FIG. is a schematic top view structural view of a first cover body part according to the present invention.

[0036] Figure 12 FIG. is a schematic bottom view structural view of a second cover body part according to the present invention.

[0037] Figure 13This is the front view of the second cover member of the present invention.

[0038] In the figure: 1, hub motor assembly; 2, cover assembly; 3, hub member; 4, stator member; 5, first cover member; 6, second cover member; 301, hub; 302, first rotating hole; 303, first arc-shaped heat sink; 304, motor rotor; 305, positioning block; 306, insertion slot; 307, rotating gear ring; 401, rotating shaft; 402, motor stator; 403, limiting slot; 404, limiting rail; 405, sliding sleeve; 406, missing gear; 407, rotating circular plate; 408, missing tooth ring; 409, first flow channel; 501, first cover; 502, second arc-shaped fin; 503, second rotating hole; 504, central axis; 505, first gear; 506, turbine fan blade; 507, external thread cylinder; 508, second fitting ring; 509, rectangular slot; 510, displacement slot; 511, insertion plate; 512, sliding rod; 601, second cover; 602, internal thread cylinder; 603, first heat dissipation slot; 604, second heat dissipation slot; 605, first fitting ring; 606, keyway. Detailed implementation manners

[0039] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0041] In the present invention, unless otherwise stated, the orientations such as "upper, lower" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the sake of easy understanding and description, "left, right" are usually in the left and right shown in the drawings; "inside, outside" refer to the inside and outside relative to the contours of the respective components, but the above orientation terms are not used to limit the present invention.

[0042] Embodiment 1, please refer to Figures 1-13 , the present invention provides the following technical solutions:

[0043] A brushless hub motor for an energy-saving electric bicycle. Specifically, it includes a hub motor assembly 1, and a cover body assembly 2 is clamped and arranged at one end of the hub motor assembly 1; the hub motor assembly 1 includes a hub member 3 and a stator member 4 rotatably fitted on the hub member 3; the cover body assembly 2 includes a first cover body member 5 sleeved and fitted at one end of the hub member 3 and a second cover body member 6 threadedly and rotatably connected to the first cover body member 5; the hub member 3 includes a hub 301, a first rotating hole 302 is penetrated and opened at the inner bottom of the hub 301, and a plurality of first arc-shaped radiating fins 303 distributed in a circumferential array are embedded at the outer bottom of the hub 301, and the plurality of first arc-shaped radiating fins 303 penetrate through the outer bottom of the hub 301, and a motor rotor 304 is fixed on the inner wall of the hub 301; the stator member 4 includes a rotating shaft 401 rotatably fitted inside the first rotating hole 302, a motor stator 402 is arranged on the circumferential side of the rotating shaft 401, two symmetrical limiting grooves 403 are opened on the circumferential side of the rotating shaft 401, limiting rails 404 are inserted and fitted inside the two limiting grooves 403, a sliding sleeve 405 slidably fitted on the rotating shaft 401 is fixed between the two limiting rails 404, a missing gear 406 is fixed on the outer circumferential side of the sliding sleeve 405, a rotating circular plate 407 is fixed on the outer circumferential side of the sliding sleeve 405 close to one side of the missing gear 406, and a missing tooth ring 408 is fixed on one side of the rotating circular plate 407.

[0044] Furthermore, the first cover body member 5 includes a first cover body 501, a second arc-shaped fin 502 extending outward is embedded at the inner top of the first cover body 501, a second rotating hole 503 rotatably fitted on the rotating shaft 401 is penetrated and opened at the inner top of the first cover body 501, two symmetrical central shafts 504 are fixed at the inner top of the first cover body 501 below the second arc-shaped fin 502, first gears 505 are rotatably fitted on the circumferential sides of the two central shafts 504, and the first gears 505 are meshed with the missing gear 406 and the missing tooth ring 408; turbine fan blades 506 are fixed at the tops of the two first gears 505 below the second arc-shaped fin 502.

[0045] The specific application of the first embodiment is as follows:

[0046] When the entire brushless hub motor is installed and fixed on the electric bicycle frame, the hub 301 in the brushless hub motor and the tire provided on the circumferential side of the hub 301 rotate synchronously on the circumferential side of the rotating shaft 401 (the driving method of the hub 301 and the tire provided on the circumferential side of the hub 301 is the prior art and will not be elaborated here). When the hub 301 and the tire provided on the circumferential side of the hub 301 rotate synchronously on the circumferential side of the rotating shaft 401, the first cover member 5 detachably connected and fixed to one end face of the hub 301 rotates synchronously with the hub 301 and the tire provided on the circumferential side of the hub 301. When the first cover member 5 detachably connected and fixed to one end face of the hub 301 rotates synchronously with the hub 301 and the tire provided on the circumferential side of the hub 301, the two central shafts 504 fixed below the second arc-shaped fin 502 at the inner top of the first cover 501 and the first gears 505 respectively rotatably engaged with the circumferential sides of the two central shafts 504 rotate relatively in opposite directions and move synchronously on the circumferential sides of the missing gear 406 and the missing tooth ring 408 respectively, thereby driving the turbine fan blades 506 respectively fixed below the second arc-shaped fin 502 at the tops of the two first gears 505 to rotate relatively repeatedly synchronously, thereby increasing the fluidity of the internal hot air during the operation of the device, enabling the internal hot air to fully contact with the plurality of first arc-shaped heat dissipation fins 303 and the plurality of second arc-shaped fins 502, increasing the heat dissipation performance of the entire brushless hub motor during use, and the entire heat dissipation process does not require adding an additional drive source. Just by the process that the hub 301 in the device and the tire provided on the circumferential side of the hub 301 rotate synchronously on the circumferential side of the rotating shaft 401, the heat dissipation effect during use can be increased, achieving a certain energy-saving effect to a certain extent and increasing the heat dissipation effect of the entire brushless hub motor;

[0047] During the operation and use of the above brushless hub motor, through the turbine-shaped design of the plurality of first arc-shaped heat dissipation fins 303 and the plurality of second arc-shaped fins 502, centrifugal force can be generated to a certain extent by the synchronous rotation of the hub 301 and the tire provided on the circumferential side of the hub 301, enabling the hot air inside the brushless hub motor to be absorbed and dissipated along the directions of the plurality of first arc-shaped heat dissipation fins 303 and the plurality of second arc-shaped fins 502, further accelerating the heat dissipation effect of the entire brushless hub motor during use and achieving a certain energy-saving effect.

[0048] Embodiment 2, please refer to Figures 1-13, in the second embodiment, the following improvements are made on the basis of the first embodiment. Specifically, an external threaded cylinder 507 is communicated above the second rotating hole 503 at the outer top of the first cover body 501; the second cover body member 6 includes a second cover body 601 sleeved and fitted outside the first cover body 501, and an internal threaded cylinder 602 threadedly connected to the outer peripheral side of the external threaded cylinder 507 is communicated at the outer top of the second cover body 601; a plurality of first flow grooves 409 are formed through one side of the rotating circular plate 407; a plurality of first heat dissipation grooves 603 are formed through the outer top of the second cover body 601, and a plurality of second heat dissipation grooves 604 are formed through the outer peripheral side of the second cover body 601; a first fitting ring 605 is fixed at the bottom of the second cover body 601, and a plurality of key grooves 606 are formed through the top of the first fitting ring 605; a plurality of positioning blocks 305 are fixed at the outer top of the hub 301, and a plugging groove 306 is formed through one side of each of the plurality of positioning blocks 305; a second fitting ring 508 is fixed at the bottom of the first cover body 501, a plurality of rectangular grooves 509 are formed through the outer peripheral side of the second fitting ring 508, displacement grooves 510 respectively communicated with the rectangular grooves 509 are formed on the surfaces of the second fitting ring 508 and the first cover body 501, a plugging plate 511 is slidably fitted inside each of the plurality of rectangular grooves 509, a sliding rod 512 slidably fitted inside the displacement groove 510 is fixed at the top of the plugging plate 511, and the plurality of sliding rods 512 are respectively slidably fitted with the key grooves 606.

[0049] The specific application of the second embodiment is as follows:

[0050] When the brushless hub motor is installed, the two ends of the rotating shaft 401 are sequentially fixed and installed at the bottom of the electric bicycle frame, so as to provide a certain power source for the walking process of the electric bicycle in the later stage. When the entire brushless hub motor is installed, the motor stator 402 in the brushless hub motor is powered on and works. The motor stator 402 can drive the motor rotor 304 to rotate. The motor rotor 304 drives the hub 301 and the tire arranged on its outer peripheral side to rotate around the outer periphery of the motor stator 402 (the motor rotor 304 rotates relative to the motor stator 402 in the magnetic field, the rotating shaft 401 and the motor stator 402 are relatively stationary to supply the magnetic field for the motor stator 402 to generate rotation. The process of the motor stator 402 driving the motor rotor 304 to rotate is the prior art and will not be elaborated here in detail). Furthermore, finally, the hub 301 arranged on the rotating shaft 401 and the tire arranged on its outer peripheral side rotate circumferentially relative to the entire electric bicycle frame, so as to realize the walking process of the entire electric bicycle;

[0051] During the assembly process of the brushless hub motor described above, after the internal structure of the entire brushless hub motor is assembled, first, the external threaded cylinder 507 connected to the first cover body 501 is slidably sleeved on the peripheral side of the rotating shaft 401 until the bottom of the second fitting ring 508 is mutually fitted with the outer top of the hub 301. Then, the internal threaded cylinder 602 connected to the outer top of the second cover body 601 is threadedly connected to the peripheral side of the external threaded cylinder 507, so that the internal threaded cylinder 602 can gradually show a downward trend on the peripheral side of the external threaded cylinder 507 (when the internal threaded cylinder 602 gradually shows a downward trend of threading on the peripheral side of the external threaded cylinder 507, its several sliding rods 512 are respectively and sequentially slidably arranged inside several key grooves 606, and during the entire sliding process, the height of the sliding rod 512 is long enough to ensure that when the internal threaded cylinder 602 starts to rotate downward in threads on the peripheral side of the external threaded cylinder 507, its several sliding rods 512 are respectively and sequentially slidably arranged inside several key grooves 606), and respectively drive several sliding rods 512 to do radial mutual contraction movements inside several displacement grooves 510 in sequence, and then finally drive the plugging plates 511 respectively fixed to the bottoms of several sliding rods 512 to do radial mutual contraction movements inside several rectangular grooves 509 penetrated and opened on the peripheral side of the second fitting ring 508 until after several plugging plates 511 are plugged and matched into the plugging grooves 306, the first fitting ring 605 fixed to the bottom of the second cover body 601 and the second fitting ring 508 fixed to the bottom of the first cover body 501 are in a mutually fitted state, thereby completing the installation process of the entire first cover body 501 and the second cover body 601, replacing the original bolt fixed connection method, bringing certain convenience to the installation process of the staff and facilitating the staff to carry out subsequent installation;

[0052] When the internal structure of the entire device needs to be cleaned, repaired, and replaced, rotate the second cover body 601 in the reverse direction, so that the internally threaded cylinder 602 connected to the outer top of the second cover body 601 gradually moves in a reverse threaded manner on the circumferential side of the externally threaded cylinder 507, and gradually reaches a lifted state, thereby driving the first fitting ring 605 fixed to the bottom of the second cover body 601 to gradually move away from the top of the second fitting ring 508. When the first fitting ring 605 fixed to the bottom of the second cover body 601 gradually moves away from the top of the second fitting ring 508, the internally threaded cylinder 602 rotates in a reverse threaded manner on the circumferential side of the externally threaded cylinder 507, driving a plurality of sliding rods 512 to perform radially expanding movements inside a plurality of displacement grooves 510 respectively, and finally driving the plug-in plates 511 respectively fixed to the bottoms of the plurality of sliding rods 512 to perform radially expanding movements inside a plurality of rectangular grooves 509 penetrated and opened on the circumferential side of the second fitting ring 508. Until the plurality of plug-in plates 511 are removed from the plug-in slots 306, the first fitting ring 605 fixed to the bottom of the second cover body 601 and the second fitting ring 508 fixed to the bottom of the first cover body 501 are in a separated state, thus completing the detachable process of the entire first cover body 501 and second cover body 601, replacing the original disassembly method, bringing certain convenience to the disassembly and maintenance process of the staff, and facilitating the staff to perform subsequent disassembly and maintenance.

[0053] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0054] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] It should be noted that the terms "first", "second", etc. in the description, claims, and drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0057] The above is only the preferred implementation manner of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A brushless hub motor for an energy-saving electric bicycle, comprising a hub motor assembly, characterized in that: One end of the in-wheel motor assembly is clamped and provided with a cover assembly; The in-wheel motor assembly includes a wheel hub member and a stator member rotatably fitted on the wheel hub member; The cover assembly includes a first cover member sleeved and fitted at one end of the wheel hub member and a second cover member threadedly and rotatably connected to the first cover member; The wheel hub member includes a wheel hub. A first rotating hole is penetrated and opened at the inner bottom of the wheel hub. A plurality of first arc-shaped heat dissipation fins distributed in a circumferential array are embedded at the outer bottom of the wheel hub. The plurality of first arc-shaped heat dissipation fins penetrate the outer bottom of the wheel hub. A motor rotor is fixed to the inner wall of the wheel hub; The stator member includes a rotating shaft rotatably fitted inside the first rotating hole. A motor stator is arranged on the circumferential side of the rotating shaft. Two symmetrical limiting grooves are opened on the circumferential side of the rotating shaft. Limiting rails are inserted and fitted inside the two limiting grooves respectively. A sliding sleeve slidably fitted on the rotating shaft is fixed between the two limiting rails. A missing gear is fixed to the outer circumferential side of the sliding sleeve. A rotating circular plate is fixed to the outer circumferential side of the sliding sleeve close to one side of the missing gear. A missing tooth ring is fixed to one side of the rotating circular plate; The first cover member includes a first cover. A second arc-shaped fin extending outward is embedded at the inner top of the first cover; A second rotating hole rotatably fitted on the rotating shaft is penetrated and opened at the inner top of the first cover. Two symmetrical central shafts are fixed to the inner top of the first cover below the second arc-shaped fin. A first gear is rotatably fitted on the circumferential side of each of the two central shafts. The first gears are engaged with the missing gear and the missing tooth ring; Turbine fan blades are fixed to the tops of the two first gears below the second arc-shaped fin; 2. The brushless hub motor for an energy-saving electric bicycle according to claim 1, wherein: An external thread cylinder is communicated above the second rotating hole at the outer top of the first cover; The second cover member includes a second cover sleeved and fitted outside the first cover. An internal thread cylinder threadedly connected to the outer circumferential side of the external thread cylinder is communicated and arranged at the outer top of the second cover; 3. The brushless hub motor for an energy-saving electric bicycle according to claim 2, wherein: A plurality of first flow grooves are penetrated and opened on one side of the rotating circular plate; A plurality of first heat dissipation grooves are penetrated and opened at the outer top of the second cover. A plurality of second heat dissipation grooves are penetrated and opened on the outer circumferential side of the second cover; 4. The brushless hub motor for an energy-saving electric bicycle according to claim 3, characterized in that: A first fitting ring is fixed to the bottom of the second cover. A plurality of key grooves are penetrated and opened at the top of the first fitting ring; A plurality of positioning blocks are fixed to the outer top of the wheel hub. Plugging grooves are penetrated and opened on one side of each of the plurality of positioning blocks; 5. The brushless hub motor for an energy-saving electric bicycle according to claim 4, characterized in that: A second fitting ring is fixed to the bottom of the first cover. A plurality of rectangular grooves are penetrated and opened on the outer circumferential side of the second fitting ring. Displacement grooves respectively communicated with the rectangular grooves are opened on the surfaces of the second fitting ring and the first cover; 6. The brushless hub motor for an energy-saving electric bicycle according to claim 5, characterized in that: Plugging plates are slidably fitted inside the plurality of rectangular grooves respectively. A sliding rod slidably fitted inside the displacement groove is fixed to the top of the plugging plate. The plurality of sliding rods are slidably fitted with the key grooves respectively.

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