High-stability wheel hub motor for bicycle

Abstract

The application relates to the technical field of hub motors, in particular to a high-stability hub motor for bicycles, which comprises a motor main body, a bearing end arranged at the end of the motor main body and a main shaft body connected with the bearing end; the hub motor further comprises an oil seal assembly, a limiting assembly for circumferentially limiting the oil seal assembly and a protection assembly for protecting the oil seal assembly; a mounting prepositioning is provided through the insertion of the ring and the annular insertion slot and the insertion of the positioning clamping head and the positioning clamping groove, then the positioning is realized through the clamping of the stable clamping convex and the stable clamping groove on the inner side of the limiting end cover, that is, a limiting effect is provided for the circumferential direction of the oil seal main body to avoid the sliding friction of the oil seal main body and the deviation of the outer diameter; the use of the protection assembly comprises a protection cover which is used for providing a protection effect for the oil seal assembly to avoid the damage of the hard objects such as the splashed stones from the outside to the oil seal assembly, so as to improve the use stability.

Description

Technical Field

[0001] This invention relates to the field of hub motor technology, and in particular to a high-stability hub motor for bicycles. Background Technology

[0002] In-wheel motors, also known as wheel-mounted motor technology, integrate power, transmission, and braking devices into the wheel hub, greatly simplifying the mechanical structure of electric vehicles. Power can be directly transmitted to the wheels, eliminating intermediate transmission components such as differentials and half-shafts.

[0003] Once powered on, the motor directly drives the wheel hub to rotate, eliminating the transmission link of traditional centralized motors. This enables independent drive of a single wheel and supports special functions such as differential steering and U-turns on the spot. The power transmission efficiency is far higher than that of traditional transmission solutions.

[0004] In actual operation, existing hub motors are constantly exposed to complex conditions such as mud and water splashes and gravel impacts. Moisture, dust, and corrosive media can easily penetrate the motor housing, causing a series of faults such as internal winding corrosion, bearing jamming, and short circuits. The shaft seal is a high-frequency entry point for dust intrusion, as it is the connection point between the motor shaft and the housing. Current technology generally uses oil seals to prevent dust intrusion at this location. Typically, the oil seal is interference-fitted into a groove in the housing end cover. However, this oil seal lacks proper positioning, allowing it to rotate axially. Wear can cause deviations in the outer diameter of the oil seal, affecting the coaxiality between the oil seal and the shaft. The oil seal's lips contact the shaft; the inner lip prevents oil leakage, while the outer lip blocks moisture, dust, and other impurities. The inner lip has an oil film, resulting in low friction loss, while the outer lip lacks lubrication, leading to wear and high temperatures over time, reducing its effectiveness in blocking contaminants. Furthermore, the outer lip of the oil seal is exposed and lacks adequate protection.

[0005] Therefore, this invention proposes a highly stable hub motor for bicycles to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a highly stable hub motor for bicycles to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-stability bicycle hub motor, comprising a motor body, a bearing end disposed at the end of the motor body, and a main shaft connected to the bearing end; The motor body is also provided with a first sealing groove and an annular slot at the end, and positioning slots are provided at equal intervals in the annular slot. The hub motor also includes an oil seal assembly, a limiting assembly for circumferentially limiting the oil seal assembly, and a protective assembly for protecting the oil seal assembly. The oil seal assembly includes an oil seal body and a sealing inner lip and a sealing outer lip structure disposed inside the oil seal body. It also includes a plug ring fixedly disposed on one side of the oil seal body and adapted to be inserted into the annular slot. A self-tightening elastic element is provided in the sealing inner lip, and a positioning clip head adapted to be inserted into the positioning clip groove is provided in the plug ring. The limiting component includes a stabilizing protrusion that is equidistantly fixed on the outer ring surface of the oil seal body, a limiting end cap, and a stabilizing groove that is disposed on the inner side of the limiting end cap and is adapted to engage with the stabilizing protrusion. The protective components include a protective cover.

[0008] Preferably, a first oil passage is also provided at equal intervals in the inner sealing lip.

[0009] Preferably, the sealing outer lip structure includes an outer lip body, an inner sealing ring, and an outer sealing ring; The outer lip body is located inside the oil seal body, and the inner sealing ring and the outer sealing ring are located inside the outer lip body. A second oil port is provided at equal intervals on the inner sealing ring.

[0010] Preferably, an annular heat sink is provided between the inner sealing ring and the outer sealing ring, and auxiliary through grooves are evenly provided in the annular heat sink.

[0011] Preferably, the limiting component further includes a second sealing groove, a sealing ring, and a heat dissipation cavity structure; The second sealing groove is located on the inner side of the limiting end cap and corresponds to the position of the first sealing groove. The first sealing groove and the second sealing groove are joined together to form a sealing cavity for placing the sealing ring. The limiting end cap is fixedly connected to the motor body by internal hex bolts.

[0012] Preferably, the heat dissipation cavity structure includes auxiliary cavities equidistantly arranged in the outer sealing ring, and a spherical buffer cavity and a communicating cavity arranged in the oil seal body; One end of the auxiliary cavity is located on the inner annular surface of the outer sealing ring, and the other end is connected to the spherical buffer cavity. The spherical buffer cavity is connected to the other end of the connecting cavity, and the other end of the connecting cavity is connected to the docking groove located in the stabilizing protrusion. The heat dissipation cavity structure also includes a through cavity disposed in the limiting end cover and an annular heat dissipation cavity disposed on the outer end face of the limiting end cover. One end of the through cavity is connected to the annular heat dissipation cavity, and the other end is connected to the stable slot and corresponds to the docking slot.

[0013] Preferably, the protection component further includes an auxiliary structure disposed on the inner end face of the protective cover and corresponding to the position of the annular heat dissipation cavity; A through-hole is provided in the radial position of the protective cover, and the protective cover is fixedly connected to the main shaft body by a stabilizing screw.

[0014] Preferably, a first oil filling groove is provided radially at equal intervals on the inner end face of the protective cover, and a second oil filling groove is also provided on the inner end face of the protective cover, the second oil filling groove intersecting with the first oil filling groove.

[0015] Preferably, the auxiliary structure includes an anti-debris ring fixedly disposed on the inner end face of the protective cover and cleaning scrapers equidistantly disposed on the outer side wall of the anti-debris ring; The inner surface of the anti-debris baffle ring contacts the inner wall of the annular heat dissipation chamber, and the outer wall of the cleaning scraper also contacts the inner wall of the annular heat dissipation chamber.

[0016] Preferably, the anti-debris retaining ring is provided with a hollow cavity; The outer ring surface of the anti-debris barrier is uniformly provided with a first mesh, and the inner ring surface is uniformly provided with a second mesh, which is staggered with the first mesh.

[0017] Compared with the prior art, the beneficial effects of the present invention are: The hub motor designed in this invention includes an oil seal assembly, a limiting assembly for circumferentially limiting the oil seal assembly, and a protective assembly for protecting the oil seal assembly. The oil seal assembly includes an oil seal body and sealing inner and outer lip structures disposed on the inner side of the oil seal body. It also includes a plug ring fixedly disposed on one side of the oil seal body and adapted to be inserted into an annular slot. A self-tightening elastic element is provided in the sealing inner lip, and a positioning head adapted to be inserted into a positioning slot is provided in the plug ring. The limiting assembly includes a stabilizing protrusion fixedly disposed at equal intervals on the outer annular surface of the oil seal body, and a limiting end cap and a stabilizing groove disposed on the inner side of the limiting end cap and adapted to be inserted into the stabilizing protrusion. For the installation and positioning of the oil seal assembly, a pre-positioning is provided by the insertion of the insertion ring and the annular slot and the insertion of the positioning head and the positioning slot. Then, the positioning is achieved by the engagement of the stabilizing protrusion and the stabilizing slot on the inner side of the limiting end cover. This provides a limiting effect on the circumference of the oil seal body to prevent the oil seal body from sliding and causing deviation in its outer diameter. In addition, the sealing lip structure located inside the oil seal body improves its dustproof and dirt-proof effect through the cooperation of the inner sealing ring and the outer sealing ring; and through the use of the annular heat sink and the heat dissipation cavity structure, it can also dissipate the heat generated at the sealing lip structure location. The protective components include a protective cover, which provides protection for the oil seal assembly, preventing damage from external flying debris such as gravel, thereby improving its operational stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the hub motor structure of the present invention; Figure 2 This is an exploded view of a partial structure of the hub motor of the present invention, including the oil seal assembly, the limiting assembly, and the protective assembly. Figure 3 for Figure 2 Enlarged schematic diagram of the structural connection at point A; Figure 4 This is an exploded view of the structural connection of the oil seal assembly, limiting assembly, and protection assembly of the present invention; Figure 5 for Figure 4 Enlarged schematic diagram of the structural connection at point B; Figure 6 This is a schematic diagram of the internal structure of the oil seal assembly of the present invention, showing the connection inside. Figure 7 for Figure 6 Enlarged schematic diagram of the structural connection at point C; Figure 8 This is a schematic diagram showing the internal structure of the oil seal assembly of the present invention connected to the outer side; Figure 9 This is a schematic diagram of the limiting end cap structure of the present invention; Figure 10 for Figure 9 Enlarged schematic diagram of the structural connection at point D; Figure 11 This is a schematic diagram of the inner end face structure of the protective cover of the present invention; Figure 12 for Figure 11 Enlarged schematic diagram of the structural connection at point E in the middle; Figure 13 This is a partial structural diagram of the anti-debris retaining ring of the present invention.

[0019] In the diagram: 1. Motor body; 11. First sealing groove; 12. Annular slot; 13. Positioning slot; 2. Main spindle body; 3. Bearing end; 401. Oil seal body; 402. Insert ring; 403. Positioning clip; 404. Sealing inner lip; 405. Self-tightening elastic element; 406. First oil port; 501. Outer lip body; 502. Inner sealing ring; 503. Outer seal; 504. Annular heat sink; 505. Auxiliary through groove; 506. Second oil port; 601. Retaining protrusion; 602. Limiting end cap; 603. Second sealing groove; 6031. Sealing ring; 604. Retaining groove; 605. Socket head cap bolt; 701. Auxiliary cavity; 702. Spherical buffer cavity; 703. Connecting cavity; 704. Docking groove; 705. Through cavity; 706. Annular heat dissipation cavity; 801. Protective cover; 802. Through-hole; 803. Retaining screw; 804. First oil filling groove; 805. Second oil filling groove; 901. Anti-debris retaining ring; 902. Cleaning scraper; 903. Hollow cavity; 904. First mesh; 905. Second mesh. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1-13 A high-stability bicycle hub motor includes a motor body 1, a bearing end 3 disposed at the end of the motor body 1, and a main shaft 2 connected to the bearing end 3; a first sealing groove 11 and an annular slot 12 are also provided at the end of the motor body 1, and positioning slots 13 are equally spaced in the annular slot 12. The hub motor also includes an oil seal assembly, a limiting assembly for circumferentially limiting the oil seal assembly, and a protective assembly for protecting the oil seal assembly; The oil seal assembly includes an oil seal body 401, an inner sealing lip 404 and an outer sealing lip structure disposed on the inner side of the oil seal body 401, a plug ring 402 fixedly disposed on one side of the oil seal body 401 and adapted to be inserted into the annular slot 12, a self-tightening elastic element 405 disposed in the inner sealing lip 404, and a positioning head 403 adapted to be inserted into the positioning slot 13 disposed in the plug ring 402; and the limiting assembly includes a stabilizing protrusion 601 fixedly disposed at equal intervals on the outer annular surface of the oil seal body 401, a limiting end cap 602 and a stabilizing groove 604 disposed on the inner side of the limiting end cap 602 and adapted to be inserted into the stabilizing protrusion 601. For the installation and positioning of the oil seal assembly, a pre-positioning is provided by the insertion of the insertion ring 402 into the annular slot 12 and the insertion of the positioning head 403 into the positioning slot 13. Then, the positioning is achieved by the engagement of the stabilizing protrusion 601 into the stabilizing slot 604 on the inner side of the limiting end cover 602. This provides a circumferential limiting effect for the oil seal body 401 to prevent the oil seal body 401 from sliding and causing deviation in its outer diameter.

[0022] In addition, the sealing outer lip structure set inside the oil seal body 401, in which the inner sealing ring 502 and the outer sealing ring 503 work together to improve its dustproof and dirtproof effect; and through the use of the annular heat sink 504 and the heat dissipation cavity structure, the heat generated at the sealing outer lip structure position can also have a heat dissipation effect.

[0023] The protective components include a protective cover 801, which provides protection for the oil seal assembly to prevent damage from external flying debris such as gravel, thereby improving its operational stability.

[0024] From the appendix Figure 6 -Appendix Figure 8 As shown, for the use of the sealing inner lip 404, a first oil port 406 is also provided on it at equal intervals, and the first oil port 406 is arranged in a ring.

[0025] The purpose of setting the first oil port 406 here is to allow lubricating oil to pass through the sealing inner lip 404.

[0026] The sealing outer lip structure includes an outer lip body 501, an inner sealing ring 502, and an outer sealing ring 503. The outer lip body 501 is disposed inside the oil seal body 401, and the inner sealing ring 502 and the outer sealing ring 503 are disposed inside the outer lip body 501. Second oil passages 506 are equidistantly disposed on the inner sealing ring 502.

[0027] The inner sealing ring 502 and the outer sealing ring 503 located on the bottom side of the outer lip body 501 are equivalent to two layers of protection, which can better prevent external dirt from entering the oil seal assembly and the motor body 1.

[0028] Combined with the first oil port 406 provided in the inner sealing lip 404, lubricating oil enters from the first oil port 406 between the inner sealing lip 404 and the inner sealing ring 502, so that the lubricating oil is immersed between the inner sealing ring 502 and the axial surface of the main shaft 2, thereby reducing the friction between the two; similarly, the purpose of providing the second oil port 506 on the inner sealing ring 502 is to allow the lubricating oil to re-enter the cavity between the inner sealing ring 502 and the outer sealing ring 503.

[0029] Then from the appendix Figure 7 As shown, this solution also includes an annular heat sink 504 between the inner sealing ring 502 and the outer sealing ring 503, and auxiliary through grooves 505 are evenly arranged in the annular heat sink 504.

[0030] The annular heat sink 504 provided here provides heat dissipation. The auxiliary through groove 505 provided in the annular heat sink 504 is used for oil immersion, so that there is an oil film between the annular heat sink 504 and the cylindrical surface of the spindle body 2. This oil film also provides an auxiliary lubrication effect for the outer sealing ring 503.

[0031] For the installation and positioning of the oil seal body 401, in conjunction with the attached... Figure 3 -Appendix Figure 5 As shown, the use of the limiting component also includes a second sealing groove 603, a sealing ring 6031, and a heat dissipation cavity structure; the second sealing groove 603 is located on the inner end of the limiting end cover 602 and corresponds to the position of the first sealing groove 11; the limiting end cover 602 is fixedly connected to the motor body 1 by internal hex bolts 605.

[0032] In other words, for the installation and positioning of the oil seal body 401, the insertion ring 402 on one side is inserted into the annular slot 12 at the end of the motor body 1, and the positioning clip 403 on the insertion ring 402 is engaged with the positioning slot 13 in the annular slot 12. The pre-positioning of the oil seal body 401 is then completed. After that, the limiting end cover 602 is installed to stably limit the oil seal body 401.

[0033] That is, the limiting end cover 602 is attached to the end of the motor body 1 and then fixed with hex bolts 605. During this process, on the one hand, the sealing ring 6031 needs to be locked in the first sealing groove 11 at the end of the motor body 1; on the other hand, the stabilizing groove 604 on the inner side of the limiting end cover 602 needs to be aligned with the stabilizing protrusion 601 on the outer side of the oil seal body 401, and the stabilizing protrusion 601 needs to be locked into the stabilizing groove 604. Here, after the limiting end cover 602 is installed and fixed to the motor body 1, the first sealing groove 11 at the end of the motor body 1 and the second sealing groove 603 on the inner side of the limiting end cover 602 are connected to form a sealing cavity for placing the sealing ring 6031.

[0034] Combined with the appendix Figure 4 -Appendix Figure 7 and appendix Figure 9 -Appendix Figure 10 As shown, the heat dissipation cavity structure includes an auxiliary cavity 701 equidistantly arranged in the outer sealing ring 503, and a spherical buffer cavity 702 and a connecting cavity 703 arranged in the oil seal body 401. One end of the auxiliary cavity 701 is arranged on the inner annular surface of the outer sealing ring 503, and the other end is connected to the spherical buffer cavity 702. The spherical buffer cavity 702 is connected to the other end of the connecting cavity 703, and the other end of the connecting cavity 703 is connected to the mating groove 704 arranged in the stabilizing protrusion 601. The heat dissipation cavity structure also includes a through cavity 705 disposed in the limiting end cover 602 and an annular heat dissipation cavity 706 disposed on the outer end face of the limiting end cover 602; one end of the through cavity 705 is connected to the annular heat dissipation cavity 706, and the other end is connected to the stabilizing slot 604 and corresponds to the position of the docking slot 704.

[0035] That is, after the stabilizing protrusion 601 is inserted into the stabilizing slot 604, the mating groove 704 in the stabilizing protrusion 601 is aligned with the through cavity 705 in the limiting end cover 602.

[0036] At the point where the outer sealing ring 503 contacts the cylindrical surface of the main shaft 2, the heat generated can be dissipated through the combined use of the auxiliary cavity 701, the connecting cavity 703, the docking groove 704, the through cavity 705, and the annular heat dissipation cavity 706, which provides a heat dissipation effect, that is, provides a gas flow effect, to dissipate the heat.

[0037] The auxiliary groove 505 in the outer sealing ring 503 is located at the contact point between the outer sealing ring 503 and the main spindle 2. This serves two purposes: firstly, it provides heat dissipation for the cylindrical surface of the main spindle 2; secondly, if too much oil is immersed between the outer sealing ring 503 and the cylindrical surface of the main spindle 2, the auxiliary groove 505 can guide the oil, preventing it from seeping out from the outer sealing ring 503. Furthermore, the spherical buffer cavity 702 assists in heat dissipation. Oil immersed in the auxiliary groove 505 can remain in the spherical buffer cavity 702 at its bottom, thus avoiding obstruction of heat dissipation.

[0038] Finally, the exposed parts of the oil seal assembly need to be protected to prevent damage from flying debris such as gravel; therefore, in conjunction with the attached... Figure 10 -Appendix Figure 13 As shown, for the use of the protective component, a through hole 802 is provided in the radial position of the protective cover 801. The protective cover 801 is fixedly connected to the main shaft body 2 by a stabilizing screw 803. A first oil filling groove 804 is provided radially at equal intervals on the inner end face of the protective cover 801. A second oil filling groove 805 is also provided on the inner end face of the protective cover 801. The second oil filling groove 805 intersects with the first oil filling groove 804.

[0039] In this design, the protective cover 801 is fixedly connected to the main shaft 2 by a stabilizing screw 803, meaning that the protective cover 801 will rotate as the main shaft 2 rotates.

[0040] In addition, the purpose of providing the first oil filling groove 804 and the second oil filling groove 805 on the inner side of the protective cover 801 is that after the protective cover 801 is fixedly installed, its inner ring contacts the cylindrical surface of the main shaft body 2, and its inner cover surface will contact the limiting end cover 602. In order to avoid excessive friction and heat between the rotating protective cover 801 and the limiting end cover 602, grease or lubricating oil is added to the first oil filling groove 804 and the second oil filling groove 805. On the one hand, this can reduce friction damage and heat generation. On the other hand, it forms an oil film between the limiting end cover 602 and the protective cover 801 to prevent external impurities from entering from there.

[0041] Furthermore, the protective assembly also includes an auxiliary structure disposed on the inner end face of the protective cover 801 and corresponding to the position of the annular heat dissipation cavity 706; the auxiliary structure includes an anti-debris ring 901 fixedly disposed on the inner end face of the protective cover 801 and cleaning scrapers 902 equidistantly disposed on the outer side wall of the anti-debris ring 901.

[0042] After the protective cover 801 is installed and fixed with the stabilizing screw 803, the anti-debris baffle ring 901 located inside the protective cover 801 enters the annular heat dissipation cavity 706 to prevent external impurities from accumulating in the annular heat dissipation cavity 706. These impurities not only affect heat dissipation but may also invade the oil seal assembly from here. Therefore, this solution provides a hollow cavity 903 in the anti-debris baffle ring 901; first mesh holes 904 are evenly arranged on the outer annular surface of the anti-debris baffle ring 901, and second mesh holes 905 are evenly arranged on the inner annular surface. The second mesh holes 905 are staggered with the first mesh holes 904; that is, the ventilation and heat dissipation effect is ensured by setting the first mesh holes 904 and the second mesh holes 905; and the staggered arrangement of the second mesh holes 905 and the first mesh holes 904 makes it difficult for dust and other impurities to directly invade, thus improving its filtration and blocking effect.

[0043] Furthermore, the inner ring surface of the anti-debris baffle 901 contacts the inner cavity sidewall of the annular heat dissipation cavity 706, and the outer wall of the cleaning scraper 902 also contacts the inner cavity sidewall of the annular heat dissipation cavity 706; here, the outer ring surface of the anti-debris baffle 901 does not contact the inner cavity sidewall of the annular heat dissipation cavity 706, the purpose of which is to ensure unobstructed heat dissipation; and the cleaning scraper 902, while rotating with the protective cover 801, also rotates in the annular heat dissipation cavity 706, scraping away the dirt accumulated or adhering in the annular heat dissipation cavity 706; here, lubricating oil or heat dissipation grease can also be applied to the anti-debris baffle 901 or the annular heat dissipation cavity 706, to ensure heat dissipation while avoiding excessive friction damage and heat.

[0044] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0045] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A high-stability bicycle hub motor, comprising a motor body (1), a bearing end (3) disposed at the end of the motor body (1), and a main shaft (2) connected to the bearing end (3). Its features are: A first sealing groove (11) and an annular slot (12) are provided at the end of the motor body (1), and positioning slots (13) are provided at equal intervals in the annular slot (12). The hub motor also includes an oil seal assembly, a limiting assembly for circumferentially limiting the oil seal assembly, and a protective assembly for protecting the oil seal assembly. The oil seal assembly includes an oil seal body (401), an inner sealing lip (404) and an outer sealing lip structure disposed inside the oil seal body (401), and a plug ring (402) fixedly disposed on one side of the oil seal body (401) and adapted to be inserted into the annular slot (12). A self-tightening elastic element (405) is provided in the inner sealing lip (404), and a positioning head (403) adapted to be inserted into the positioning slot (13) is provided in the plug ring (402). The limiting component includes a stabilizing protrusion (601) that is equidistantly fixed on the outer ring surface of the oil seal body (401), a limiting end cap (602), and a stabilizing groove (604) that is disposed on the inner side of the limiting end cap (602) and is adapted to engage with the stabilizing protrusion (601). The protective components include a protective cover (801).

2. The high-stability bicycle hub motor according to claim 1, characterized in that: The inner sealing lip (404) is also provided with first oil inlets (406) at equal intervals.

3. The high-stability bicycle hub motor according to claim 1, characterized in that: The sealing outer lip structure includes an outer lip body (501), an inner sealing ring (502), and an outer sealing ring (503). The outer lip body (501) is disposed inside the oil seal body (401), and the inner sealing ring (502) and the outer sealing ring (503) are disposed inside the outer lip body (501); A second oil inlet (506) is provided at equal intervals on the inner sealing ring (502).

4. The high-stability bicycle hub motor according to claim 3, characterized in that: An annular heat sink (504) is provided between the inner sealing ring (502) and the outer sealing ring (503), and auxiliary through grooves (505) are uniformly provided in the annular heat sink (504).

5. The high-stability bicycle hub motor according to claim 3, characterized in that: The limiting component also includes a second sealing groove (603), a sealing ring (6031), and a heat dissipation cavity structure; The second sealing groove (603) is located on the inner side of the limiting end cap (602) and corresponds to the position of the first sealing groove (11). The first sealing groove (11) and the second sealing groove (603) are connected to form a sealing cavity for placing the sealing ring (6031). The limiting end cap (602) is fixedly connected to the motor body (1) by an internal hex bolt (605).

6. The high-stability bicycle hub motor according to claim 5, characterized in that: The heat dissipation cavity structure includes an auxiliary cavity (701) equidistantly arranged in the outer sealing ring (503) and a spherical buffer cavity (702) and a connecting cavity (703) arranged in the oil seal body (401). One end of the auxiliary cavity (701) is located on the inner annular surface of the outer sealing ring (503), and the other end is connected to the spherical buffer cavity (702). The spherical buffer cavity (702) is connected to the other end of the connecting cavity (703), and the other end of the connecting cavity (703) is connected to the docking groove (704) located in the stabilizing protrusion (601). The heat dissipation cavity structure also includes a through cavity (705) disposed in the limiting end cover (602) and an annular heat dissipation cavity (706) disposed on the outer end face of the limiting end cover (602). One end of the through cavity (705) is connected to the annular heat dissipation cavity (706), and the other end is connected to the stabilizing slot (604) and corresponds to the position of the docking slot (704).

7. The high-stability bicycle hub motor according to claim 6, characterized in that: The protection assembly also includes an auxiliary structure disposed on the inner end face of the protective cover (801) and corresponding to the position of the annular heat dissipation cavity (706); A through-hole (802) is provided in the radial position of the protective cover (801), and the protective cover (801) is fixedly connected to the main shaft (2) by a stabilizing screw (803).

8. The high-stability bicycle hub motor according to claim 7, characterized in that: A first oil filling groove (804) is provided radially at equal intervals on the inner end face of the protective cover (801), and a second oil filling groove (805) is also provided on the inner end face of the protective cover (801), which intersects with the first oil filling groove (804).

9. The high-stability bicycle hub motor according to claim 7, characterized in that: The auxiliary structure includes a debris-proof ring (901) fixedly installed on the inner end face of the protective cover (801) and cleaning scrapers (902) equidistantly arranged on the outer side wall of the debris-proof ring (901). The inner ring surface of the anti-debris ring (901) contacts the inner cavity sidewall of the annular heat dissipation cavity (706), and the outer wall of the cleaning scraper (902) also contacts the inner cavity sidewall of the annular heat dissipation cavity (706).

10. The high-stability bicycle hub motor according to claim 9, characterized in that: The anti-debris retaining ring (901) is provided with a hollow cavity (903); The outer ring surface of the anti-debris ring (901) is uniformly provided with a first mesh (904) and the inner ring surface is uniformly provided with a second mesh (905), and the second mesh (905) is staggered with the first mesh (904).

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