Inner rotor cylinder shaft wheel hub motor

Abstract

The application provides an inner rotor cylinder shaft wheel hub motor, which comprises an end cover assembly, a core assembly and a wheel hub assembly, the core assembly is arranged inside a working cavity between the end cover assembly and the wheel hub assembly; the core assembly comprises a cylinder shaft, a double planetary gear, a planetary support, a sun gear, a rotor, a stator coil assembly and a sheath, one end of the cylinder shaft penetrates through the wheel hub assembly and is connected with an external frame; the cylinder shaft is fixedly connected with the inner side of the sheath, the sheath and the planetary support are respectively arranged on the two sides of the stator coil assembly, and the double planetary gear is arranged on the planetary support; the sun gear is arranged outside the cylinder shaft, the rotor is fixedly arranged outside one end of the sun gear, and the gear end of the sun gear is connected with the inner ring gear of the end cover assembly through the double planetary gear. The application adopts the inner rotor structure arrangement matched with the double gear planetary reduction structure, which can ensure quietness and comfort, good controllability, high reduction ratio, large torque and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of electric bicycle accessories technology, specifically to an internal rotor cylinder shaft hub motor. Background Technology

[0002] Currently, there are various types of bicycles that use hub motors for power assist, but hub motors using the thru-axle mounting method are relatively few. Due to the limitations of the bicycle thru-axle structure, the power density of a thru-axle hub motor of the same volume is much lower than that of a traditional hub motor. Therefore, how to provide a thru-axle hub motor that can both ensure comfort and effectively utilize internal space to increase power has become an urgent problem to be solved.

[0003] Patent document CN215971947U discloses an external rotor hub motor. This external rotor hub motor includes a motor body and a motor shaft. The motor body includes a stator and a support and positioning sleeve located on the radial inner wall of the stator. The motor shaft and the support and positioning sleeve are detachably connected, allowing the motor shaft to be separated from the motor body. The advantages of this external rotor hub motor are: the detachable connection between the motor body and the motor shaft allows the motor body to be removed from the motor shaft without damaging it, making maintenance relatively easy and reducing packaging and transportation costs. However, this hub motor does not fully utilize the internal space to increase power. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide an internal rotor cylinder shaft hub motor.

[0005] The inner rotor cylinder shaft hub motor provided by the present invention includes an end cover assembly, a core assembly and a hub assembly connected coaxially in sequence. The end cover assembly and the hub assembly are fixedly connected to form a working cavity, and the core assembly is disposed inside the working cavity.

[0006] The mechanism assembly includes a barrel shaft, a double planetary gear, a planetary carrier, a sun gear, a rotor, a stator coil assembly, and a sheath. The planetary carrier, sun gear, rotor, stator coil assembly, and sheath are all sleeved on the outside of the barrel shaft. One end of the barrel shaft is a fixed end, which passes through the hub assembly and is fixedly connected to the external frame.

[0007] The cylindrical shaft is fixedly connected to the inner side of the sheath, the sheath is installed on the side of the stator coil assembly facing the fixed end, the planetary support is installed on the other side of the stator coil assembly, and the double planetary gear is installed on the planetary support;

[0008] The sun gear is rotatably disposed outside the cylinder shaft, and the rotor is fixedly mounted on the outside of one end of the sun gear near the fixed end of the cylinder shaft. The other end of the sun gear is a gear end, which is connected to the internal gear ring of the end cover assembly through a double planetary gear, forming a planetary gear mechanism.

[0009] The end cap assembly has an end cap that is fixedly connected to the external wheel.

[0010] Preferably, the mechanism assembly further includes a waterproof wire, a circuit board, and a wire harness cover plate, and the sheath includes a stator sheath and an insulating sheath, wherein the insulating sheath and the wire harness cover plate are fixedly connected to the side of the stator sheath near the stator coil assembly.

[0011] The insulating sheath and the wire harness cover are arranged opposite to each other, forming a wiring cavity between them. The circuit board is arranged on the insulating sheath. One end of the waterproof wire is located outside the core assembly, and the other end of the waterproof wire passes through the gap between the stator sheath and the cylinder shaft, and connects the stator coil assembly and the circuit board through the wiring cavity.

[0012] Preferably, an injection hole is provided at the contact point between the cylindrical shaft and the waterproof line, and the glue flows into the gap between the stator sheath and the cylindrical shaft through the hollow structure inside the cylindrical shaft and the injection hole in sequence.

[0013] Preferably, the sun gear meshes with the first gear of the double planetary gear, and the second gear of the double planetary gear meshes with the internal gear ring of the end cap assembly.

[0014] Preferably, the end cap assembly includes a tower base assembly, an end cap, an internal gear ring, a clutch star wheel, and a clutch cover plate;

[0015] The clutch star wheel is fixedly mounted on the side of the end cover near the movement assembly. The internal gear ring is sleeved on the outside of the clutch star wheel and pressed onto the clutch star wheel by the clutch cover plate. The internal gear ring can rotate under the drive of the double planetary gear, thereby driving the end cover to rotate through the clutch star wheel.

[0016] The outer edge of the end cap is fixedly connected to the hub assembly, and the inner side of the end cap is rotatably connected to the cylinder shaft through an end cap bearing. The tower base assembly is located on the side of the end cap away from the movement assembly.

[0017] Preferably, a one-way ratchet structure is provided at the connection between the tower base assembly and the end cap. When the tower base assembly rotates, the one-way ratchet structure can drive the end cap to rotate. When the end cap rotates, the one-way ratchet structure can disengage it from the tower base assembly.

[0018] A one-way ratchet structure is provided between the inner side of the internal gear ring and the outer side of the clutch star wheel. When the internal gear ring rotates, it can drive the clutch star wheel to rotate through the one-way ratchet structure. When the clutch star wheel rotates, it can disengage from the internal gear ring through the one-way ratchet structure.

[0019] Preferably, the end cap assembly further includes an end cap O-ring, a second O-ring, and an end cap oil seal, wherein the end cap O-ring is used to seal the contact surface between the end cap and the wheel hub assembly;

[0020] The outer side of the end cover bearing is interference-fitted with the end cover, the inner side of the end cover bearing is clearance-fitted with the cylinder shaft, and a second O-ring is provided between the two. The end cover bearing is a waterproof bearing.

[0021] The end cap and the cylinder shaft are connected by the end cap oil seal. The outer side of the end cap oil seal is interference-fitted with the end cap and fixedly connected to it, while the inner side of the end cap oil seal is interference-fitted with the cylinder shaft and rotatably connected.

[0022] Preferably, the hub assembly includes a deep groove ball bearing and a hub, the hub being sleeved outside the spool shaft and rotatably connected to the spool shaft via the deep groove ball bearing;

[0023] The outer edge of the end cap is coaxially and fixedly connected to the outer edge of the hub.

[0024] Preferably, it further includes a first O-ring and a hub oil seal, the outer side of the deep groove ball bearing is interference-fitted with the hub, the inner side of the deep groove ball bearing is clearance-fitted with the cylindrical shaft, and a first O-ring is provided between the two, and the deep groove ball bearing is a waterproof bearing;

[0025] The hub and the cylinder shaft are connected by the hub oil seal. The outer side of the hub oil seal is interference-fitted with the hub and relatively fixed, while the inner side of the hub oil seal is interference-fitted with the cylinder shaft and rotatably connected.

[0026] Preferably, the movement assembly further includes an anti-rotation bracket, one side of which is provided with a waist-shaped boss, and the other side of which is provided with a U-shaped boss;

[0027] The fixed end of the cylinder shaft is provided with a waist-shaped groove, and the waist-shaped boss on one side of the anti-rotation bracket is connected to the waist-shaped groove. The U-shaped boss on the other side of the anti-rotation bracket is connected to the groove on the outer frame.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention has a simple structure and is easy to operate. By adopting an internal rotor structure arrangement combined with a double planetary gear reduction structure, it can ensure quietness, comfort, and good controllability. At the same time, it can obtain large torque while maintaining high efficiency with a high reduction ratio.

[0030] 2. This invention adopts a waterproof line design as an integrated plug on the side of the motor. Compared with a fixed plug, this connection position can be changed at will and the connection is reliable. In addition, the lead wire connection position on the cylinder shaft is provided with an injection hole to ensure sealing performance and the wire harness can withstand a certain drag force.

[0031] 3. This invention employs a double-layer sealing and waterproofing technique involving both O-rings and oil seals for the wheel hub assembly and end cap assembly, thereby further improving waterproof performance. Attached Figure Description

[0032] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0033] Figure 1 This is an exploded view of the present invention;

[0034] Figure 2 This is an exploded view of the wheel hub assembly in this invention;

[0035] Figure 3 This is a half-sectional schematic diagram of the wheel hub assembly in this invention;

[0036] Figure 4 This is a half-sectional schematic diagram of the end cap assembly in this invention;

[0037] Figure 5 This is an exploded view of the end cap assembly in this invention;

[0038] Figure 6 This is a half-sectional schematic diagram of the movement assembly in this invention;

[0039] Figure 7 This is an exploded view of the movement components in this invention;

[0040] Figure 8 This is a schematic diagram of the anti-rotation bracket at one angle in this invention;

[0041] Figure 9 This is a schematic diagram of the anti-rotation bracket from another angle in this invention;

[0042] Figure 10 This is a schematic diagram of the structure of the cylindrical shaft in this invention;

[0043] Figure 11 This is a schematic diagram of the waterproof line in this invention.

[0044] The diagram shows:

[0045] End cap assembly 1 First O-ring 26

[0046] Mechanism assembly 2 Wiring harness cover 27

[0047] Hub assembly 3, stator coil assembly 28

[0048] Deep groove ball bearing 4, stator sleeve 29

[0049] Wheel hub 5 Insulation sleeve 30

[0050] Wheel hub oil seal 6 Circuit board 31

[0051] Sealing ring 7, Circuit board screw 32

[0052] 8 screws, 33 waterproof line

[0053] Tower base assembly 9, cylinder shaft 34

[0054] Countersunk screw 10 A-key 35

[0055] End cap oil seal 11, sun gear bearing 36

[0056] End cap 12, bushing 37

[0057] End cap O-ring 13, planetary support bearing 38

[0058] End cover bearing 14, planetary gear bearing 39

[0059] Internal gear ring 15, planetary gear retaining ring 40

[0060] Clutch star wheel 16, cage screw 41

[0061] Clutch cover 17 Planetary cage 42

[0062] Clutch cover plate screw 18, second O-ring 43

[0063] Planetary support screw 19 Anti-rotation bracket 44

[0064] Double planetary gear 20, snap ring 45

[0065] Shaft snap ring 21 U-shaped boss 46

[0066] Planetary support 22, waist-shaped boss 47

[0067] Sun gear 23, waist-shaped groove 48

[0068] Rotor magnet 24, injection hole 49

[0069] Rotor core 25 Detailed Implementation

[0070] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0071] This invention discloses an internal rotor cylindrical shaft hub motor with a simple structure. By combining an internal rotor structure with a double-tooth planetary reduction structure, it can ensure quietness, comfort, and good controllability. It can also achieve high torque while maintaining high efficiency through a high reduction ratio.

[0072] The internal rotor cylinder shaft hub motor provided by the present invention, such as Figure 1 , Figure 6-7 As shown, it includes an end cap assembly 1, a movement assembly 2, and a wheel hub assembly 3 connected coaxially in sequence. The end cap assembly 1 and the wheel hub assembly 3 are fixedly connected to form a working cavity, and the movement assembly 2 is disposed inside the working cavity.

[0073] The movement assembly 2 includes a barrel shaft 34, a double planetary gear 20, and a planetary support 22, a sun gear 23, a rotor, a stator coil assembly 28, and a protective sleeve, all sleeved on the outside of the barrel shaft 34. One end of the barrel shaft 34 is a fixed end, which passes through the hub assembly 3 and is fixedly connected to the external frame. The barrel shaft 34 is fixedly connected to the inside of the protective sleeve, which is installed on the side of the stator coil assembly 28 facing the fixed end. The planetary support 22 is installed on the other side of the stator coil assembly 28, and the double planetary gear 20 is installed on the planetary support 22.

[0074] The sun gear 23 is rotatably disposed outside the cylindrical shaft 34. The rotor is fixedly mounted on the outside of one end of the sun gear 23 near the fixed end of the cylindrical shaft 34. The other end of the sun gear 23 is a gear end, which is connected to the internal gear ring 15 of the end cover assembly 1 via a double planetary gear 20, forming a planetary gear mechanism. The end cover 12 of the end cover assembly 1 is fixedly connected to an external wheel. Preferably, the sun gear 23 meshes with the first gear of the double planetary gear 20, and the second gear of the double planetary gear 20 meshes with the internal gear ring 15 of the end cover assembly 1.

[0075] Preferably, the mechanism assembly 2 further includes a waterproof wire 33, a circuit board 31, and a wire harness cover 27. The sheath includes a stator sheath 29 and an insulating sheath 30. The insulating sheath 30 and the wire harness cover 27 are fixedly connected to the side of the stator sheath 29 near the stator coil assembly 28. The insulating sheath 30 and the wire harness cover 27 are arranged opposite to each other, forming a wiring cavity between them. The circuit board 31 is disposed on the insulating sheath 30. One end of the waterproof wire 33 is located outside the mechanism assembly 2, and the other end of the waterproof wire 33 passes through the gap between the stator sheath 29 and the cylinder shaft 34, and connects the stator coil assembly 28 and the circuit board 31 through the wiring cavity. Figure 10-11 As shown, an injection hole 49 is provided on the cylindrical shaft 34 at the contact point with the waterproof line 33. Adhesive flows sequentially through the hollow structure inside the cylindrical shaft 34 and the injection hole 49 into the gap between the stator sheath 29 and the cylindrical shaft 34, ensuring sealing performance while allowing the wire harness to withstand a certain drag force. Preferably, the waterproof line 33 is an elliptical flat wire, which facilitates threading. Furthermore, compared to a fixed connector, this connection position can be freely changed, and the connection is reliable.

[0076] like Figure 4-5 As shown, the end cover assembly 1 includes a base assembly 9, an end cover 12, an internal gear ring 15, a clutch star wheel 16, and a clutch cover plate 17. The clutch star wheel 16 is fixedly disposed on the side of the end cover 12 near the movement assembly 2. The internal gear ring 15 is sleeved on the outside of the clutch star wheel 16 and pressed against the clutch star wheel 16 by the clutch cover plate 17. The internal gear ring 15 can rotate under the drive of the double planetary gear 20, thereby driving the end cover 12 to rotate through the clutch star wheel 16. The outer edge of the end cover 12 is fixedly connected to the hub assembly 3, and the inner side of the end cover is rotatably connected to the cylinder shaft 34 through the end cover bearing 14. The base assembly 9 is disposed on the side of the end cover 12 away from the movement assembly 2. Preferably, the axial direction of the end cover assembly 1 is limited by a retaining spring, which can reduce one shoulder on the cylinder shaft and provide more usable internal space.

[0077] Preferably, a one-way ratchet structure is provided at the connection between the tower base assembly 9 and the end cover 12. When the tower base assembly 9 rotates, it can drive the end cover 12 to rotate through the one-way ratchet structure. When the end cover 12 rotates, it can disengage from the tower base assembly 9 through the one-way ratchet structure. A one-way ratchet structure is provided between the inner side of the internal gear ring 15 and the outer side of the clutch star wheel 16. When the internal gear ring 15 rotates, it can drive the clutch star wheel 16 to rotate through the one-way ratchet structure. When the clutch star wheel 16 rotates, it can disengage from the internal gear ring 15 through the one-way ratchet structure.

[0078] The end cap assembly 1 further includes an end cap O-ring 13, a second O-ring 43, and an end cap oil seal 11. The end cap O-ring 13 is used to seal the contact surface between the end cap 12 and the hub assembly 3. The outer side of the end cap bearing 14 is interference-fitted with the end cap 12, and the inner side of the end cap bearing 14 is clearance-fitted with the cylindrical shaft 34. A second O-ring 43 is provided between the two. The end cap bearing 14 is a waterproof bearing. The end cap 12 and the cylindrical shaft 34 are connected by the end cap oil seal 11. The outer side of the end cap oil seal 11 is interference-fitted with the end cap 12 and relatively fixed. The inner side of the end cap oil seal 11 is interference-fitted with the cylindrical shaft 34 and rotatably connected.

[0079] like Figure 2-3 As shown, the hub assembly 3 includes a deep groove ball bearing 4 and a hub 5. The hub 5 is sleeved on the outside of the spool shaft 34 and rotatably connected to the spool shaft 34 through the deep groove ball bearing 4. The outer edge of the end cap 12 is coaxially fixedly connected to the outer edge of the hub 5. It also includes a first O-ring 26 and a hub oil seal 6. The outer side of the deep groove ball bearing 4 is interference-fitted with the hub 5, and the inner side of the deep groove ball bearing 4 is clearance-fitted with the spool shaft 34. A first O-ring 26 is provided between the two. The deep groove ball bearing 4 is a waterproof bearing. The hub 5 and the spool shaft 34 are connected by the hub oil seal 6. The outer side of the hub oil seal 6 is interference-fitted with the hub 5 and relatively fixedly connected, while the inner side of the hub oil seal 6 is interference-fitted with the spool shaft 34 and rotatably connected.

[0080] like Figure 8-9 As shown, the movement assembly 2 also includes an anti-rotation bracket 44. One side of the anti-rotation bracket 44 has a waist-shaped boss 47, and the other side has a U-shaped boss 46. The fixed end of the cylindrical shaft 34 has a waist-shaped groove 48. The waist-shaped boss 47 on one side of the anti-rotation bracket 44 engages with the waist-shaped groove 48, and the U-shaped boss 46 on the other side of the anti-rotation bracket 44 engages with a groove on the outer frame. The waist-shaped boss 47, which mates with the cylindrical shaft 34, allows the anti-rotation bracket 44 to withstand greater torque.

[0081] The above are the basic embodiments of the present invention. The following describes the solution of the present invention in further detail through several preferred embodiments.

[0082] Example 1

[0083] Compared to the basic embodiment described above, this embodiment mainly improves upon the angle of the wheel hub assembly 3. Specifically, as follows: Figure 2-3As shown, the hub assembly 3 consists of a deep groove ball bearing 4, a hub 5, and a hub oil seal 6. The hub 5 is connected to the cylindrical shaft 34 via the deep groove ball bearing 4, allowing the hub 5 to rotate freely relative to the cylindrical shaft 34. The outer diameter of the deep groove ball bearing 4 is interference-fitted with the hub 5 to ensure the outer ring sealing. The inner diameter of the deep groove ball bearing 4 is clearance-fitted with the cylindrical shaft 34, but the two are connected by a first O-ring 26 to ensure the inner ring sealing. The bearing is a waterproof bearing, which can form a sealing structure. In addition, the hub 5 and the cylindrical shaft 34 are also connected by the hub oil seal 6. The outer diameter of the hub oil seal 6 is interference-fitted with the hub 5 to achieve relative fixation. The outer diameter of the hub oil seal 6 is interference-fitted with the cylindrical shaft 34, but can rotate relative to it, which can also ensure sealing. This can form a second sealing structure to ensure the superior sealing performance in the working cavity.

[0084] Example 2

[0085] Compared to the basic embodiment described above, this embodiment has made further improvements in the angle of the end cap assembly 1. Specifically, as follows: Figure 4-5As shown, the end cover assembly 1 consists of a sealing ring 7, screws 8, a tower base assembly 9, countersunk screws 10, an end cover oil seal 11, an end cover 12, an end cover O-ring 13, an end cover bearing 14, an internal gear ring 15, a clutch star wheel 16, a clutch cover plate 17, and clutch cover plate screws 18. The clutch star wheel 16 is fixed to the end cover 12 by the countersunk screws 10. The internal gear ring 15 is fitted onto the outer diameter of the clutch star wheel 16, and the two form a one-way clutch. The internal gear ring 15 is restricted by the clutch cover plate 17. The cover plate 17 is locked to the clutch star wheel 16 by the clutch cover plate screws 18. When rotated, it can drive the clutch star wheel 16 to rotate, thereby driving the end cover 12 to rotate. The internal gear ring 15 and the axial end cover 12 are fixed together with the hub 5 by screws 8, so that the hub 5 can also rotate synchronously. The mating surface between the end cover 12 and the hub 5 is guaranteed to have effective sealing performance by the compression of the end cover O-ring 13. The end cover 12 is connected to the cylinder shaft 34 by the end cover bearing 14, so the end cover 12 can rotate freely relative to the cylinder shaft 34. The outer diameter of the end cover bearing 14 is interference-fitted with the end cover 12 to ensure the outer ring sealing. The inner diameter of the end cover bearing 14 is clearance-fitted with the cylinder shaft 34, but the inner ring sealing is ensured by connecting the two with a hub O-ring 43. The bearing is a waterproof bearing, which can form a sealing structure. In addition, the end cover 12 and the cylinder shaft 34 are also connected by the end cover oil seal 11. The outer diameter of the end cover oil seal 11 is tightly fitted with the end cover 12 and relatively fixed. The outer diameter of the oil seal 11 is interference-fitted with the cylinder shaft 34, but can rotate relative to it. It can ensure sealing and form a second sealing structure to ensure strong sealing performance in the working chamber. The outer diameter of the sealing ring 7 is fixed to the end cover 12, and the inner diameter is interference-fitted with the tower base assembly 9 but can rotate relative to it to ensure a certain sealing performance. The axial direction of the tower base assembly 9 is limited by the shaft retaining spring 21. The connection between the tower base assembly 9 and the end cover 12 is a one-way ratchet. When the tower base assembly 9 rotates, it can drive the end cover 12 to rotate. When the end cover 12 rotates, the two can be disengaged so that the tower base assembly 9 is not affected.

[0086] Example 2

[0087] Compared to the basic embodiment described above, this embodiment has been further improved in terms of the movement assembly 2. Specifically, as follows: Figure 6-7As shown, the movement assembly 2 consists of planetary support screw 19, double planetary gear 20, shaft retaining ring 21, planetary support 22, sun gear 23, rotor magnet 24, rotor core 25, hub O-ring 26, wire harness cover plate 27, stator coil assembly 28, stator sleeve 29, insulating sleeve 30, circuit board 31, circuit board screw 32, waterproof wire 33, cylinder shaft 34, A-key 35, sun gear bearing 36, bushing 37, planetary support bearing 38, planetary gear bearing 39, planetary gear retaining ring 40, planetary cage 41, cage screw 42, second O-ring 43, anti-rotation bracket 44, retaining ring 45, U-shaped boss 46, waist-shaped boss 47, waist-shaped groove 48, and glue injection hole 49; the stator coil assembly... Stator coil assembly 28 is fixedly connected to stator sleeve 29 and planetary support 22 via planetary support screw 19. Stator sleeve 29 is connected to cylinder shaft 34 via A-key 35 to achieve torque transmission. Cylinder shaft 34 is fixedly connected to the frame. Circuit board 31 is fixedly connected to stator sleeve 29 via circuit board screw 32. Waterproof wire 33 passes through cylinder shaft 34 and enters the interior to connect stator coil assembly 28 and circuit board 31, used to transmit internal and external electrical energy and signals. The gap between waterproof wire 33 and cylinder shaft 34 is filled with glue through glue injection hole 49, which can ensure sealing and allow waterproof wire 33 to withstand a certain drag force. Insulating sleeve 30 and wire harness cover 27 are fixedly connected to stator sleeve 29, and the space between them is used to place waterproof wire harness 28. Water line 33 and its connecting parts isolate the wiring harness from the metal parts and the moving rotor core 25, ensuring insulation and safety. Rotor magnets 24 are fixed in pairs to the rotor core 25, which is interference-fitted to the sun gear 23. Axial restraint is achieved by snap ring 45, allowing for effective torque transmission. The sun gear 23 is connected to the cylinder shaft 34 via two sun gear bearings 36, which are secured by bushings 37 to maintain effective axial position. The sun gear 23 is connected to the planetary carrier 22 via planetary carrier bearings 38. Thus, when the external controller transmits electrical energy to the stator coil assembly 28 through the water line 33, forming a rotating magnetic field, this magnetic field, combined with the magnetic field of the paired rotor magnets 24, causes the rotor core to rotate. The core 25 can rotate, thereby driving the sun gear 23 to rotate; the double planetary gear 20 is connected to the pin of the planetary carrier 22 through two planetary gear bearings 39, and is axially limited by the planetary gear retainer 40. The large gear of the double planetary gear 20 meshes with the sun gear 23, and the small gear of the double planetary gear 20 meshes with the internal gear ring 15. When the sun gear 23 rotates, it transmits the rotation to the internal gear ring 15 through the double planetary gear 20, thereby driving the hub 5 and the end cover 12 to rotate together, and also achieving speed reduction and torque increase; the other end of the pin of the planetary carrier 22 is also circumferentially fixed by the planetary cage 41, making the double planetary gear 20 work more reliably. The planetary cage 41 is fixed to the planetary carrier 22 by the cage screw 42.The anti-rotation bracket 44 connects the cylindrical shaft 34 to the frame and is used to transmit torque. One end of the anti-rotation bracket 44 has a waist-shaped boss 47, which mates with a waist-shaped groove 48 on the cylindrical shaft 34 to bear torque. The other end has a U-shaped boss 46, which mates with a groove on the frame to bear torque.

[0088] The working principle of this invention is as follows:

[0089] An external controller transmits electrical energy to the stator coil assembly 28 via a waterproof line 33, forming a rotating magnetic field. Under the magnetic field of the paired rotor magnets 24, the rotor core 25 rotates, thereby driving the sun gear 23 to rotate. The sun gear 23 drives the internal gear ring 15 to rotate via a double planetary gear 20. The internal gear ring 15 drives the clutch star wheel 16 to rotate via a one-way ratchet structure between the internal gear ring 15 and the clutch star wheel 16, thereby driving the end cover 12 and the hub assembly 3 to rotate, thus driving the external wheel to rotate and providing power assistance. When the motor stops, the external wheel continues to rotate due to inertia. At this time, the clutch star wheel 16 disengages from the internal gear ring 15 via the one-way ratchet structure, and the end cover 12 disengages from the tower base assembly 9 via the one-way ratchet structure, achieving reliable anti-rotation.

[0090] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0091] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An internal rotor cylindrical shaft hub motor, characterized in that, It includes an end cap assembly (1), a movement assembly (2) and a wheel hub assembly (3) connected coaxially in sequence. The end cap assembly (1) and the wheel hub assembly (3) are fixedly connected to form a working cavity, and the movement assembly (2) is disposed inside the working cavity. The mechanism assembly (2) includes a barrel shaft (34), a double planetary gear (20), a planetary support (22), a sun gear (23), a rotor, a stator coil assembly (28), and a sheath. The planetary support (22), the sun gear (23), the rotor, the stator coil assembly (28), and the sheath are all fitted outside the barrel shaft (34). One end of the barrel shaft (34) is a fixed end, which passes through the hub assembly (3) and is fixedly connected to the external frame. The cylindrical shaft (34) is fixedly connected to the inner side of the sheath, the sheath is installed on the side of the stator coil assembly (28) facing the fixed end, the planetary support (22) is installed on the other side of the stator coil assembly (28), and the double planetary gear (20) is installed on the planetary support (22). The sun gear (23) is rotatably disposed outside the cylindrical shaft (34). The rotor is fixedly installed outside one end of the sun gear (23) near the fixed end of the cylindrical shaft (34). The other end of the sun gear (23) is a gear end. The gear end is connected to the internal gear ring (15) of the end cover assembly (1) through a double planetary gear (20) to form a planetary gear mechanism. The end cap (12) of the end cap assembly (1) is fixedly connected to the external wheel; The end cap assembly (1) includes a tower base assembly (9), an end cap (12), an internal gear ring (15), a clutch star wheel (16), and a clutch cover plate (17). The clutch star wheel (16) is fixedly mounted on the side of the end cover (12) near the mechanism assembly (2). The internal gear ring (15) is sleeved on the outside of the clutch star wheel (16) and pressed onto the clutch star wheel (16) by the clutch cover plate (17). The internal gear ring (15) can rotate under the drive of the double planetary gear (20), thereby driving the end cover (12) to rotate through the clutch star wheel (16). The outer edge of the end cap (12) is fixedly connected to the hub assembly (3), and the inner side of the end cap is rotatably connected to the cylinder shaft (34) through the end cap bearing (14). The tower base assembly (9) is located on the side of the end cap (12) away from the movement assembly (2). The hub assembly (3) includes a deep groove ball bearing (4) and a hub (5). The hub (5) is sleeved on the outside of the cylindrical shaft (34) and is rotatably connected to the cylindrical shaft (34) through the deep groove ball bearing (4). The outer edge of the end cap (12) is coaxially fixedly connected to the outer edge of the hub (5); The inner diameter of the deep groove ball bearing (4) is clearance-fitted with the cylindrical shaft (34), but the two are connected by a first O-ring (26) to ensure the sealing of the inner ring. The bearing is a waterproof bearing, forming a sealing structure. In addition, the hub (5) and the cylindrical shaft (34) are connected by a hub oil seal (6). The outer diameter of the hub oil seal (6) is interference-fitted with the hub (5) to achieve relative fixed connection. The outer diameter of the hub oil seal (6) is interference-fitted with the cylindrical shaft (34), but can rotate relative to each other to ensure sealing, forming a second sealing structure. The end cap (12) is connected to the cylinder shaft (34) through the end cap bearing (14). The end cap (12) can rotate freely relative to the cylinder shaft (34). The outer diameter of the end cap bearing (14) is interference-fitted with the end cap (12) to ensure the sealing of the outer ring. The inner diameter of the end cap bearing (14) is clearance-fitted with the cylinder shaft (34). However, the two are connected by a hub O-ring (43) to ensure the sealing of the inner ring. The bearing is a waterproof bearing, forming a sealing structure. In addition, the end cap (12) and the cylinder shaft (34) are also connected by the end cap oil seal (11). The outer diameter of the end cap oil seal (11) is tightly fitted with the end cap (12) and relatively fixed. The outer diameter of the oil seal (11) is interference-fitted with the cylinder shaft (34), but can rotate relative to each other to ensure sealing, forming a second sealing structure. The movement assembly (2) also includes an anti-rotation bracket (44), one side of which is provided with a waist-shaped boss (47), and the other side of which is provided with a U-shaped boss (46). The fixed end of the cylindrical shaft (34) is provided with a waist-shaped groove (48), the waist-shaped boss (47) on one side of the anti-rotation bracket (44) is connected to the waist-shaped groove (48), and the U-shaped boss (46) on the other side of the anti-rotation bracket (44) is connected to the groove on the outer frame. The rotor magnets (24) are fixed in pairs on the rotor core (25), the rotor core (25) is interference-fitted on the sun gear (23), and the axial direction is limited by the snap ring (45). The sun gear (23) is connected to the cylinder shaft (34) through two sun gear bearings (36). The two sun gear bearings (36) are secured by bushings (37) to ensure the effective axial position. The sun gear (23) is connected to the planetary carrier (22) through the planetary carrier bearing (38). When the external controller transmits electrical energy to the stator coil assembly (28) to form a rotating magnetic field, the rotor core (25) rotates under the action of the magnetic field of the paired rotor magnets (24), thereby driving the sun gear (23) to rotate. The double planetary gear (20) is connected to the pin of the planetary support (22) through two planetary gear bearings (39). The axial direction is limited by the planetary gear retainer (40). The large gear of the double planetary gear (20) meshes with the sun gear (23), and the small gear of the double planetary gear (20) meshes with the internal gear ring (15). When the sun gear (23) rotates, it transmits the speed to the internal gear ring (15) through the double planetary gear (20), thereby driving the hub (5) and end cover (12) to rotate together, and can also achieve speed reduction and torque increase.

2. The inner rotor cylindrical shaft hub motor according to claim 1, characterized in that, The mechanism assembly (2) also includes a waterproof wire (33), a circuit board (31) and a wire harness cover (27). The sheath includes a stator sheath (29) and an insulating sheath (30). The insulating sheath (30) and the wire harness cover (27) are fixedly connected to the stator sheath (29) on the side near the stator coil assembly (28). The insulating sheath (30) and the wire harness cover plate (27) are disposed together, forming a wiring cavity. The circuit board (31) is disposed on the insulating sheath (30). One end of the waterproof wire (33) is located outside the core assembly (2), and the other end of the waterproof wire (33) passes through the gap between the stator sheath (29) and the cylinder shaft (34) and connects the stator coil assembly (28) and the circuit board (31) through the wiring cavity.

3. The inner rotor cylindrical shaft hub motor according to claim 2, characterized in that, An injection hole (49) is provided at the contact point between the cylindrical shaft (34) and the waterproof line (33). The glue flows into the gap between the stator sleeve (29) and the cylindrical shaft (34) through the hollow structure inside the cylindrical shaft (34) and the injection hole (49).

4. The inner rotor cylindrical shaft hub motor according to claim 1, characterized in that, The sun gear (23) meshes with the first gear of the double planetary gear (20), and the second gear of the double planetary gear (20) meshes with the internal gear ring (15) of the end cap assembly (1).

5. The inner rotor cylindrical shaft hub motor according to claim 1, characterized in that, A one-way ratchet structure is provided at the connection between the tower base assembly (9) and the end cap (12). When the tower base assembly (9) rotates, it can drive the end cap (12) to rotate through the one-way ratchet structure. When the end cap (12) rotates, it can disengage from the tower base assembly (9) through the one-way ratchet structure. A one-way ratchet structure is provided between the inner side of the internal gear ring (15) and the outer side of the clutch star wheel (16). When the internal gear ring (15) rotates, it can drive the clutch star wheel (16) to rotate through the one-way ratchet structure. When the clutch star wheel (16) rotates, it can disengage from the internal gear ring (15) through the one-way ratchet structure.

6. The inner rotor cylindrical shaft hub motor according to claim 1, characterized in that, The end cap assembly (1) also includes an end cap O-ring (13), a second O-ring (43) and an end cap oil seal (11), wherein the end cap O-ring (13) is used to seal the contact surface between the end cap (12) and the hub assembly (3); The outer side of the end cover bearing (14) is interference-fitted with the end cover (12), and the inner side of the end cover bearing (14) is clearance-fitted with the cylindrical shaft (34). A second O-ring (43) is provided between the two. The end cover bearing (14) is a waterproof bearing. The end cap (12) and the cylindrical shaft (34) are connected by the end cap oil seal (11). The outer side of the end cap oil seal (11) is press-fitted with the end cap (12) and fixedly connected to it. The inner side of the end cap oil seal (11) is press-fitted with the cylindrical shaft (34) and rotatably connected to it.

7. The inner rotor cylindrical shaft hub motor according to claim 1, characterized in that, It also includes a first O-ring (26) and a hub oil seal (6), the outer side of the deep groove ball bearing (4) is interference-fitted with the hub (5), the inner side of the deep groove ball bearing (4) is clearance-fitted with the cylindrical shaft (34), and a first O-ring (26) is provided between the two. The deep groove ball bearing (4) is a waterproof bearing. The hub (5) and the cylinder shaft (34) are connected by the hub oil seal (6). The outer side of the hub oil seal (6) is interference-fitted with the hub (5) and relatively fixed. The inner side of the hub oil seal (6) is interference-fitted with the cylinder shaft (34) and rotatably connected.

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