Hub motor of electric power-assisted bicycle
By adopting the tightening structure of the rotor barrel and the barrel cover and the integrated design of the sun wheel and the rotor in the hub motor, combined with the sealing ring and key pin, the insufficient support arm and waterproof performance caused by excessive axial length of the rotor is solved. The poor problem has achieved more stable transmission and wider application scenarios.
Patent Information
- Application Number
- CN202323659636.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-30
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2033-12-30
AI Technical Summary
The existing hub motors have shortcomings in waterproof performance and assembly process optimization. The axial length of the rotor is too long, resulting in insufficient support arms, the structure occupies axial space, resulting in insufficient internal utilization of the motor, and poor transmission stability and waterproof performance.
The fastening structure of the rotor cylinder and the cylinder cover is adopted, and the sun gear and the rotor are integrated into a structure, which can achieve stable connection through spline holes and limit gear rings. The planetary carrier and the spindle are matched with key pins to increase the sealing ring to enhance waterproof performance. , and protect the internal structure of the motor through fixed threading posts and fixed posts.
Solve the problem of insufficient force arms caused by excessive axial length of the rotor, optimize the assembly process, enhance the waterproof performance and transmission stability of the motor, avoid water inlet of the motor, improve the torque and power range of the motor, and is suitable for a wider range. Application scenarios.
Smart Images
Figure CN222234596U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hub motors, and in particular relates to a hub motor for an electric power-assisted bicycle. Background Art
[0002] A hub motor is installed on the rear wheel hub of an electric power-assisted bicycle. Waterproof performance is an important indicator for measuring a hub motor. Once water enters the motor, it will cause internal parts to rust and electrical circuits to short-circuit, leading to irreversible damage to the motor. When the existing hub motor movement structure is subject to radial restrictions, the axial length of the rotor is often too long, and the rotor support arm is insufficient when the motor rotates. The sun gear and the rotor are usually connected by screws, which directly increases the motor assembly process. The hub motor planetary carrier and the main shaft are usually connected by a key pin structure. Because the strength of the key pin needs to be considered, its structure often occupies more axial space, resulting in the inability to fully utilize the internal space of the motor. Utility Model Content
[0003] In view of the above problems and technical requirements, the utility model provides a hub motor for an electric power-assisted bicycle, which can optimize the assembly process and has the characteristics of good waterproof performance and stable transmission.
[0004] The technical scheme of the utility model is as follows: a hub motor for an electric power-assisted bicycle, comprising a main shaft, a hub shell, a rotor barrel, a sun gear, a planetary carrier and an end cover, wherein the main shaft, the rotor barrel and the hub shell are coaxially arranged, the main shaft passes through both end faces of the rotor barrel, the hub shell is arranged on the outside of the rotor barrel, a stator is fixedly arranged on the main shaft, a circle of rotor is arranged on the outside of the stator, the rotor is fixedly attached to the inner wall of the rotor barrel, a spline hole is opened at the center of one end of the rotor barrel, and a barrel cover is connected to the other end of the rotor barrel; the sun gear is locked and connected to the end face of the rotor barrel through the spline hole, the planetary carrier is arranged on the outside of the sun gear, the planetary carrier is fixedly connected to the main shaft, a planetary gear is arranged on the planetary carrier, the sun gear, the planetary gear and the hub shell are transmission-connected, the end covers are sealed at both ends of the hub shell, and the end cover and the main shaft are connected through bearings. In the above scheme, after the stator on the main shaft is energized, the rotor and the rotor barrel are driven to rotate, the rotor barrel drives the sun gear to rotate, the sun gear drives the hub shell to rotate through the planetary gear, the hub shell is connected to the wheel, and the hub shell drives the vehicle forward.
[0005] Furthermore, the planetary carrier includes a disc-shaped frame body and three planetary gears. A keyway is provided on the inner side of the frame body. The frame body and the main shaft are connected by a flat key. The inner side of the frame body is rotatably connected to the three planetary gears. A circle of gear teeth is provided on the inner side of the hub shell. The inner side of the planetary gear is meshed with the sun gear, and the outer side is connected to the gear teeth. The rotor barrel drives the sun gear to rotate, and the sun gear transmits power to the hub shell.
[0006] Furthermore, a spline is provided at the end of the sun gear, and a limit ring is provided at one end of the spline, the diameter of the limit ring is larger than the diameter of the spline, and the diameter of the spline is larger than the diameter of the sun gear, the sun gear is meshed and connected with the spline hole from the inside of the rotor barrel to the outside, the limit ring is blocked on the inner end surface of the rotor barrel, the sun gear is circumferentially locked with the rotor barrel through the spline hole, and axially locked with the rotor barrel through the limit ring. The sun gear, rotor barrel and rotor are set as an integrated structure, and the sun gear does not need to be connected and matched with the rotor through fixings such as screws, which can optimize the assembly process.
[0007] Furthermore, the inner side of the limit stop ring and the main shaft are connected via a sun gear bearing.
[0008] Furthermore, the cylinder cover is embedded in the port of the rotor cylinder from the other end, a circle of screw holes is provided on the circumference of the rotor cylinder, and the cylinder cover and the rotor cylinder are locked and connected by a circle of screws. The use of a circle of screws can ensure the tight connection between the rotor cylinder and the cylinder cover.
[0009] Furthermore, the inner end surface of the cylinder cover is locked and connected to the rotor cylinder, and the outer end surface of the cylinder cover is integrated with an end bearing, and the inner hole of the end bearing is connected to the main shaft; the outer ring of the end bearing is connected to the first end cover through the first bearing, and the first bearing is embedded on the inner side surface of the first end cover, and a first sealing ring is provided between the first bearing and the end bearing.
[0010] Furthermore, the main shaft is provided with a fixed threading column, the fixed threading column and the main shaft are integrally formed, the inner hole of the end face bearing is connected to the outer circumferential surface of the fixed threading column, a second sealing ring is provided between the end face bearing and the fixed threading column, and an oblique wire hole is provided in the fixed threading column, and the wire hole is used to connect external wires to the stator.
[0011] Furthermore, the other end of the hub shell is connected to the second end cover, and a fixing column is provided on the main shaft corresponding to the second end cover. The fixing column and the main shaft are locked and connected via a positioning plane, and the second end cover and the fixing column are connected via a second bearing, and the second bearing is embedded on the inner side of the second end cover.
[0012] Furthermore, a third sealing ring is provided between the fixed column and the main shaft, and a fourth sealing ring is provided between the fixed column and the second bearing. The fixed column and the fixed threading column both increase the diameter of the main shaft at the connection, so that the connection effect between the second end cover and the end face bearing and the main shaft is better. At the same time, the fixed column and the fixed threading column also directly bear the axial locking force of the motor to protect the internal structure of the motor.
[0013] In the above scheme, the first bearing and the second bearing are respectively embedded on the inner side of the corresponding end cover, and the two end covers can protect the corresponding bearings from the outside, and prevent the external axial locking force from damaging the bearing structure after the hub motor is installed. The two end covers are respectively provided with two sealing rings, which can enhance the waterproof performance of the motor and prevent water from entering the motor.
[0014] Furthermore, the first end cover, the second end cover and the hub shell are all locked and connected by a circle of screws.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] 1. The rotor barrel and the barrel cover cooperate to make both ends of the rotor barrel rotatably supported on the main shaft, solving the problem of insufficient force arm caused by the excessive axial length of the rotor. The sun gear and the rotor are made into an integrated structure, which makes the connection and positioning of the sun gear more stable and optimizes the assembly process;
[0017] 2. The second sealing ring and the first sealing ring are respectively arranged between the barrel cover of the rotor barrel and the main shaft and the first end cover, and the third sealing ring and the fourth sealing ring are correspondingly installed at the second end cover. The setting of this waterproof structure can prevent the motor from water ingress and water seepage;
[0018] 3. The planetary carrier and the main shaft are matched with key pins, which can optimize the structure of the planetary carrier. When the motor is assembled, the planetary carrier plays a certain guiding role;
[0019] 4. The first end cover and the second end cover are both provided with bearings on the inner side, and fixed threading columns and fixed columns are also provided at the end covers at both ends of the main shaft, so as to prevent the axial locking force of the motor from being transmitted to the inside of the motor after the motor is installed, causing irreversible damage to the motor;
[0020] 5. The above structure can increase the transmission mechanism within the effective internal space of the motor, effectively providing the torque and power range of the motor; it can enable the motor to be used in a wider range of scenarios. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is the external structure diagram of the hub motor of the utility model;
[0022] Figure 2 This is an axial cross-sectional structural diagram of the hub motor of the utility model;
[0023] Figure 3 This is a diagram of the internal structure of the hub housing in the utility model;
[0024] Figure 4 The exploded view structure of the rotor barrel and the planet carrier;
[0025] Figure 5 It is the structural diagram of the wheel hub shell;
[0026] Marked in the figure are: main shaft 1, stator 11, fixed threading column 12, wire hole 13, flat key 14, positioning plane 15, fixed column 16, hub housing 2, gear teeth 21, rotor barrel 3, rotor 31, barrel cover 32, end bearing 321, spline hole 33, sun gear 4, spline 41, limit ring 42, sun gear bearing 43, planetary carrier 5, planetary gear 51, frame body 52, keyway 521, first end cover 6, first bearing 61, first sealing ring 62, second sealing ring 63, second end cover 7, second bearing 71, third sealing ring 72, fourth sealing ring 73. DETAILED DESCRIPTION
[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0028] like Figure 1-5 The figure shows the hub motor of the electric power-assisted bicycle of the utility model, comprising a main shaft 1, a hub shell 2, a rotor barrel 3, a sun gear 4, a planetary carrier 5 and an end cover. The main shaft 1, the rotor barrel 3 and the hub shell 2 are coaxially arranged, the main shaft 1 passes through the two end surfaces of the rotor barrel 3, the hub shell 2 is arranged on the outside of the rotor barrel 3, a stator 11 is fixedly provided on the main shaft 1, a circle of rotor 31 is arranged on the outside of the stator 11, and the rotor 31 is fixedly attached to the inner wall of the rotor barrel 3, a spline hole 33 is opened at the center of one end of the rotor barrel 3, and a barrel cover 32 is connected to the other end of the rotor barrel 3.
[0029] The sun gear 4 is locked and connected to the end face of the rotor barrel 3 through the spline hole 33, the planet carrier 5 is arranged outside the sun gear 4, the planet carrier 5 is fixedly connected to the main shaft 1, the planet carrier 5 is provided with a planetary gear 51, the sun gear 4, the planetary gear 51 and the hub housing 2 are transmission connected, specifically, the end of the sun gear 4 is provided with a spline 41, one end of the spline 41 is provided with a limit ring 42, the diameter of the limit ring 42 is larger than the diameter of the spline 41, the diameter of the spline 41 is larger than the diameter of the sun gear 4, the sun gear 4 is meshed and connected with the spline hole 33 from the inside of the rotor barrel 3 to the outside, the limit ring 42 is blocked on the inner end face of the rotor barrel 3, the sun gear 4 is circumferentially locked with the rotor barrel 3 through the spline hole 33, and is axially locked with the rotor barrel 3 through the limit ring 42. The sun gear 4, the rotor barrel 3 and the rotor 31 are arranged as an integrated structure, and the inner side of the limit ring 42 and the main shaft 1 are connected through a sun gear bearing 43.
[0030] The planetary carrier 5 includes a disc-shaped frame body 52 and three planetary gears 51. A keyway 521 is provided on the inner side of the frame body 52. The frame body 52 and the main shaft 1 are connected by a flat key 14. The inner side of the frame body 52 is rotatably connected with the three planetary gears 51. A circle of gear teeth 21 is provided on the inner side of the hub shell 2. The inner side of the planetary gear 51 is meshed with the sun gear 4, and the outer side is connected to the gear teeth 21. The rotor barrel 3 drives the sun gear 4 to rotate, and the sun gear 4 transmits power to the hub shell 2.
[0031] The hub shell 2 is sealed with end caps at both ends, and the end caps are connected to the main shaft 1 through bearings. The barrel cover 32 is embedded in the port of the rotor barrel 3 from the other end, and a circle of screw holes is provided on the circumference of the rotor barrel 3. The barrel cover 32 and the rotor barrel 3 are locked and connected by a circle of screws.
[0032] The inner end surface of the cylinder cover 32 is locked and connected to the rotor cylinder 3, and the outer end surface of the cylinder cover 32 is integrated with an end bearing 321, and the inner hole of the end bearing 321 is connected to the main shaft 1; the outer ring of the end bearing 321 is connected to the first end cover 6 through the first bearing 61, and the first bearing 61 is embedded on the inner side surface of the first end cover 6, and a first sealing ring 62 is provided between the first bearing 61 and the end bearing 321.
[0033] The spindle 1 is provided with a fixed threading post 12, which is integrally formed with the spindle 1, the inner hole of the end bearing 321 is connected to the outer circumference of the fixed threading post 12, a second sealing ring 63 is provided between the end bearing 321 and the fixed threading post 12, and an oblique wire hole 13 is provided in the fixed threading post 12, which is used to connect the external wires to the stator 11. The other end of the hub shell 2 is connected to the second end cover 7, and the spindle 1 corresponding to the second end cover 7 is provided with a fixed post 16, which is locked and connected to the spindle 1 through a positioning plane 15, and the second end cover 7 and the fixed post 16 are connected through a second bearing 71, and the second bearing 71 is embedded on the inner side of the second end cover 7. The fixed column 16 and the fixed threading column 12 both increase the diameter of the main shaft 1 at the connection, so that the connection effect between the second end cover 7 and the end face bearing 321 and the main shaft 1 is better. At the same time, the fixed column 16 and the fixed threading column 12 also directly bear the axial locking force of the motor to protect the internal structure of the motor.
[0034] A third sealing ring 72 is provided between the fixing column 16 and the main shaft, and a fourth sealing ring 73 is provided between the fixing column 16 and the second bearing 71; the first end cover 6, the second end cover 7 and the wheel hub housing 2 are all locked and connected by a circle of screws. The first bearing 61 and the second bearing 71 are respectively embedded on the inner side of the corresponding end cover, and the two end covers can protect the corresponding bearings from the outside, and after the wheel hub motor is installed, the external axial locking force is prevented from damaging the bearing structure. The two end covers are respectively provided with two sealing rings, which can enhance the waterproof performance of the motor and prevent water from entering the motor.
[0035] The working principle of the utility model is as follows: the stator 11 on the main shaft 1 is energized through the wire hole 13, and the stator 11 drives the rotor 31 and the rotor barrel 3 to rotate. The barrel cover 32 at one end of the rotor barrel 3 is rotatably supported on the main shaft 1 through the end bearing 321, and the other end of the rotor barrel 3 is rotatably supported on the main shaft 1 through the sun gear bearing 43. Therefore, the rotor barrel 3, the sun gear 4, and the barrel cover 32 rotate synchronously under the drive of the rotor 31; the planet carrier 5 is locked on the main shaft 1 and remains motionless, the sun gear 4 drives the three planetary gears 51 to rotate simultaneously, and the three planetary gears 51 drive the hub shell 2 to rotate; the two ends of the hub shell 2 are fixedly connected to the first end cover 6 and the second end cover 7 respectively, the first end cover 6 is supported and connected to the outside of the end bearing 321 through the first bearing 61, and the second end cover 7 is supported and connected to the outside of the fixed column 16 through the second bearing 71, so the hub shell 2 rotates around the main shaft 1, transmits power to the wheels, and drives the vehicle to travel.
[0036] The above are only several preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims
1. A hub motor for an electric power-assisted bicycle, characterized in that: It includes a main shaft, a hub shell, a rotor barrel, a sun gear, a planetary carrier and an end cover. The main shaft, the rotor barrel and the hub shell are coaxially arranged, the main shaft passes through the two end surfaces of the rotor barrel, the hub shell is arranged on the outside of the rotor barrel, a stator is fixedly arranged on the main shaft, a circle of rotor is arranged on the outside of the stator, the rotor is fixedly attached to the inner wall of the rotor barrel, a spline hole is opened at the center of one end of the rotor barrel, and a barrel cover is connected to the other end of the rotor barrel; the sun gear is locked and connected to the end surface of the rotor barrel through the spline hole, the planetary carrier is arranged on the outside of the sun gear, the planetary carrier is fixedly connected to the main shaft, planetary gears are arranged on the planetary carrier, the sun gear, the planetary gears and the hub shell are transmission connected, the two ends of the hub shell are sealed with end covers, and the end covers and the main shaft are connected through bearings.
2. The hub motor of an electric power-assisted bicycle according to claim 1, characterized in that: The planetary carrier includes a disc-shaped frame body and three planetary gears. A keyway is provided on the inner side of the frame body. The frame body and the main shaft are connected by a flat key. The inner side of the frame body is rotatably connected to the three planetary gears. A circle of gear teeth is provided on the inner side of the hub shell. The inner side of the planetary gear is meshed with the sun gear, and the outer side is connected to the gear teeth. The rotor barrel drives the sun gear to rotate, and the sun gear transmits power to the hub shell.
3. The hub motor of an electric power-assisted bicycle according to claim 2, characterized in that: The sun gear end is provided with a spline, and a limit ring is provided at one end of the spline. The diameter of the limit ring is larger than the diameter of the spline, and the diameter of the spline is larger than the diameter of the sun gear. The sun gear is meshed and connected with the spline hole from the inside of the rotor barrel to the outside, and the limit ring is blocked on the inner end surface of the rotor barrel. The sun gear is circumferentially locked with the rotor barrel through the spline hole, and is axially locked with the rotor barrel through the limit ring.
4. The hub motor of an electric power-assisted bicycle according to claim 3, characterized in that: The inner side of the limit stop ring and the main shaft are connected via a sun gear bearing.
5. The hub motor of an electric power-assisted bicycle according to claim 4, characterized in that: The cylinder cover is embedded in the port of the rotor cylinder from the other end. A circle of screw holes is arranged on the circumference of the rotor cylinder. The cylinder cover and the rotor cylinder are locked and connected by a circle of screws.
6. The hub motor of an electric power-assisted bicycle according to claim 5, characterized in that: The inner end surface of the cylinder cover is locked and connected to the rotor cylinder, and the outer end surface of the cylinder cover is integrated with an end bearing, and the inner hole of the end bearing is connected to the main shaft; the outer ring of the end bearing is connected to the first end cover through the first bearing, and the first bearing is embedded on the inner side surface of the first end cover, and a first sealing ring is provided between the first bearing and the end bearing.
7. The hub motor of an electric power-assisted bicycle according to claim 6, characterized in that: The main shaft is provided with a fixed threading column, which is integrally formed with the main shaft, the inner hole of the end face bearing is connected to the outer circumferential surface of the fixed threading column, a second sealing ring is provided between the end face bearing and the fixed threading column, and an oblique wire hole is provided in the fixed threading column, which is used to connect external wires to the stator.
8. The hub motor of an electric power-assisted bicycle according to claim 7, characterized in that: The other end of the hub shell is connected to the second end cover, and a fixing column is provided on the main shaft corresponding to the second end cover. The fixing column and the main shaft are locked and connected via a positioning plane. The second end cover and the fixing column are connected via a second bearing, and the second bearing is embedded on the inner side of the second end cover.
9. The hub motor of an electric power-assisted bicycle according to claim 8, characterized in that: A third sealing ring is arranged between the fixing column and the main shaft, and a fourth sealing ring is arranged between the fixing column and the second bearing.
10. The hub motor of an electric power-assisted bicycle according to claim 9, characterized in that: The first end cover, the second end cover and the hub shell are all locked and connected by a circle of screws.