Hub motor

Abstract

The utility model discloses a wheel hub motor which comprises a transmission shaft, an end cover and a tower footing assembly are rotatably arranged on the transmission shaft, a wheel hub is arranged on the end cover and the tower footing assembly, the end cover and the wheel hub are connected to form a cavity, a stator, a planet carrier and a rotor are arranged in the cavity, the stator and the planet carrier are arranged on the transmission shaft, and the rotor is rotatably arranged on the transmission shaft through a rotor bearing. The sun gear is arranged on the rotor, the gear ring is arranged on the inner wall of the hub, and a planet gear matched with the gear ring and the sun gear is arranged on the planet carrier; a vertical blocking face is arranged on the transmission shaft, and one end of the planet carrier abuts against the blocking face. The transmission shaft is provided with stator bases distributed in the radial direction, and the stators are locked on the stator bases through bolts. The structure of the transmission shaft is improved to form the upwards raised blocking surface, so that the planet carrier is blocked and positioned, the stability and the reliability of the planet carrier in the working process are improved, and the application of a clamp spring is successfully reduced from the technology. The stator base is used for overcoming the axial deviation problem of the stator in the using process.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric bicycle accessories and relates to a hub motor. Background Art

[0002] As a core component of a power-assisted bicycle, the performance and structure of the hub motor play a crucial role in the overall operation effect and user experience of the power-assisted bicycle. However, there are some problems to be solved urgently in the current practical application of the hub motor.

[0003] One significant problem is that a snap ring needs to be installed on the front side of the planet carrier for fixation. Although this design ensures the stability of the planet carrier to a certain extent, it makes the structure relatively complex. Too many components not only increase the manufacturing difficulty and cost but also require more delicate operations during the assembly process. Slight deviation may affect the performance of the motor. In addition, the complex structure also brings inconvenience to the later maintenance and repair, increasing the time and cost of troubleshooting and repair.

[0004] In addition, the current hub motor lacks a dedicated glue injection port, which makes it difficult to achieve uniform and precise glue injection during the glue injection process, affecting the sealing effect of the motor. In terms of transmission, there are also certain drawbacks in using spur gear transmission. When spur gears are running, due to the direct meshing between teeth, it is easy to generate impact and noise.

[0005] In addition, there is also an obvious offset between the stator and the transmission shaft during long-term use, which affects the service life and stability of the hub motor.

[0006] Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Content of the Utility Model

[0007] The purpose of the utility model is to provide a hub motor, which solves at least one problem in the background art through structural improvement.

[0008] The purpose of the utility model is realized through the following technical solutions:

[0009] A hub motor includes a drive shaft, an end cover rotatably arranged on the drive shaft through an end cover bearing, and a tower base assembly rotatably arranged on the drive shaft through a housing bearing. A hub is arranged on the end cover and the tower base assembly. The end cover is connected to the hub to form a cavity. Inside the cavity, there is a stator fixedly arranged on the drive shaft, a rotor rotatably arranged on the drive shaft through a rotor bearing, a planet carrier fixedly arranged on the drive shaft, a sun gear fixedly arranged on the rotor, and a ring gear fixedly arranged on the inner wall of the hub. Planet gears that cooperate with the ring gear and the sun gear are arranged on the planet carrier; a vertical blocking surface is arranged on the drive shaft, and one end of the planet carrier abuts against the blocking surface; the drive shaft has a radially distributed stator base, and the stator is locked to the stator base by bolts.

[0010] As a further improvement of an embodiment of the present invention, a wire routing channel communicating with both the inside and outside of the end cover is arranged on the drive shaft, and a glue injection port communicating with the wire routing channel is arranged on the drive shaft.

[0011] As a further improvement of an embodiment of the present invention, one end of the glue injection port communicates with the wire routing channel, and the other end is blocked by the end cover bearing.

[0012] As a further improvement of an embodiment of the present invention, a first platform and a second platform in a cylindrical structure are arranged on the drive shaft. The first platform and the second platform are arranged adjacent to each other, and the diameter of the first platform is greater than that of the second platform. The blocking surface is formed at the junction of the first platform and the second platform. The planet carrier is arranged on the second platform of the drive shaft, and one end of it abuts against the blocking surface. A key connection is provided between the drive shaft and the planet carrier.

[0013] As a further improvement of an embodiment of the present invention, a key pin groove is arranged on the second platform, a notch corresponding to the key pin groove is arranged on the planet carrier, and a key pin is arranged between the key pin groove and the notch.

[0014] As a further improvement of an embodiment of the present invention, the rotor is rotatably arranged on the drive shaft through two rotor bearings with the same size and in contact with each other. The sun gear is fixed to the rotor by screws and abuts against the rotor bearing.

[0015] As a further improvement of an embodiment of the present invention, a Hall plate is arranged on the stator.

[0016] As a further improvement of an embodiment of the present invention, the ring gear, the sun gear, and the planet gears are all matching helical gears.

[0017] Adopting the above technical solution, the following beneficial effects are achieved: By improving the structure of the transmission shaft to form an upwardly protruding blocking surface, the blocking and positioning of the planet carrier are realized, enhancing the stability and reliability of the planet carrier during operation, and successfully reducing the application of snap rings in terms of technology. At the same time, helical gears are used for the ring gear, sun gear and planet gears, which can effectively reduce the noise of the in-wheel motor operation and improve the application comfort of the in-wheel motor. The stator base overcomes the axial offset problem of the stator during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0019] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions that the present invention can be implemented. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed by the present invention.

[0020] Figure 1 It is a three-dimensional state structure schematic diagram provided by the present invention.

[0021] Figure 2 It is a front view structure schematic diagram provided by the present invention.

[0022] Figure 3 For Figure 2 the sectional view structure schematic diagram along the A-A direction in

[0023] Figure 4 It is a right view structure schematic diagram provided by the present invention.

[0024] Figure 5 For Figure 4 the sectional view structure schematic diagram along the B-B direction in

[0025] Figure 6 It is a three-dimensional structure schematic diagram of the transmission shaft provided by the present invention.

[0026] In the figure:

[0027] 1 - Drive shaft; 101 - Wiring channel; 102 - Glue injection port; 103 - Stator base; 104 - Blocking surface; 105 - First platform; 106 - Second platform; 107 - Keyway slot;

[0028] 2 - End cover bearing;

[0029] 3 - End cover;

[0030] 4 - Housing bearing;

[0031] 5 - Tower base assembly;

[0032] 6 - Hub;

[0033] 7 - Stator; 701 - Stator carrier;

[0034] 8 - Rotor bearing;

[0035] 9 - Rotor;

[0036] 10 - Planet carrier;

[0037] 11 - Sun gear;

[0038] 12 - Ring gear;

[0039] 13 - Planet gear;

[0040] 14 - Hall plate. Detailed implementation manners

[0041] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe the present invention in detail with reference to the drawings and in combination with the embodiments.

[0042] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0043] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravitational directions of the components themselves; similarly, for ease of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components, but the above orientation terms are not used to limit the present invention. Embodiment

[0044] See Figures 1 - 6As shown in the figure, a hub motor includes a drive shaft 1, an end cover 3 rotatably arranged on the drive shaft 1 through an end cover bearing 2, a tower base assembly 5 rotatably arranged on the drive shaft 1 through a housing bearing 4, and a hub 6 is arranged on the end cover 3 and the tower base assembly 5. The above-mentioned end cover 3 and the tower base assembly 5 jointly support the hub 6, and the end cover 3 and the hub 6 are closely connected to form a closed cavity.

[0045] In this cavity, each component works together to achieve the efficient operation of the motor. The stator 7 fixedly arranged on the drive shaft 1 remains stationary, while the rotor 9 rotatably arranged on the drive shaft 1 through a rotor bearing 8 can rotate relatively. When an electric current passes through the stator 7 to generate a magnetic field, it interacts with the rotor 9 to drive the rotor 9 to rotate.

[0046] Among them, the wire routing of the cable passes through a wire routing channel 101 arranged on the drive shaft 1 to supply power to the stator. The above-mentioned wire routing channel 101 is distributed on one side of the end cover 3, and both ends of the wire routing channel 101 are located inside and outside the end cover 3. In order to prevent external dust from entering the cavity through the wire routing channel 101, a glue injection port 102 communicated with the wire routing channel 101 is arranged on the drive shaft 1. Glue is injected through the special glue injection port 102 to improve the glue injection quality, achieve uniform and precise glue injection, and improve the sealing performance.

[0047] The other end of the glue injection port 102 in this embodiment is blocked by the end cover bearing 2.

[0048] At the same time, the planet carrier 10 fixedly arranged on the drive shaft 1 remains stable, while the sun gear 11 fixedly arranged on the rotor 9 rotates together with the rotor 9. A ring gear 12 is fixedly arranged on the inner wall of the hub 6. Planetary gears 13 that cooperate with the ring gear 12 and the sun gear 11 are arranged on the planet carrier 10.

[0049] When the motor works, the rotation of the rotor 9 drives the sun gear 11 to rotate. The sun gear 11 then transmits the power to the planetary gear 13 through meshing with the planetary gear 13. Since the planetary gear 13 also meshes with the ring gear 12 for transmission, the power is transmitted to the ring gear 12, thereby driving the hub 6 to rotate.

[0050] In this embodiment, the drive shaft 1 has a radially distributed stator base 103. In this structure, the stator 7 is mainly firmly locked on the stator base 103 by bolts.

[0051] In the actual production process, the stator 7 has a stator carrier 701, and the stator carrier 701 is locked and connected to the stator base 103. The stator carrier 701 mentioned here is a metal part with a certain rigidity. This design has significant advantages.

[0052] The rigidity of the metal stator carrier itself enables the stator 7 to maintain a stable position and shape during operation. When the stator 7 is subjected to various forces such as electromagnetic forces and mechanical vibrations, the stator carrier 701 can effectively resist the influence of these external forces and prevent the stator 7 from deforming or displacing.

[0053] The use of bolt locking further enhances the stability of the entire connection structure. Bolt connections have a reliable clamping force, which can ensure that the stator carrier 701 is in close contact with the stator base 103 without loosening or separation. Even under the condition of long-term high-load operation of the in-wheel motor, this locking method can effectively resist vibration and shock, ensuring the position accuracy and working stability of the stator 7.

[0054] In this embodiment, the rotor 9 is rotatably arranged on the drive shaft 1 through two rotor bearings 8 of the same size and in contact with each other. A step is specifically provided on the drive shaft 1 for one end of the rotor bearing 8 to abut against. It should be particularly noted that the rotor bearing closer to the stator 7 abuts tightly against this step. The rotor bearing on the side away from the stator 7 abuts against one end of the sun gear 11.

[0055] The sun gear 11 in this embodiment is firmly fixed to the rotor 9 by screws.

[0056] By limiting the position through the sun gear 11 and the step on the drive shaft 1, the stability of the rotor 9 during operation can be significantly improved. When the motor is running, the rotor 9 rotates at a high speed, generating a large centrifugal force and various dynamic forces. In this case, the step on the drive shaft 1 provides reliable support and positioning for the rotor bearing closer to the stator 7, restricting its axial displacement.

[0057] At the same time, the rotor bearing on the side away from the stator 7 abuts against the sun gear 11, and the sun gear 11 is fixed to the rotor 9, thus also providing a stable limiting effect for this side of the rotor bearing.

[0058] In this embodiment, a Hall plate 14 with an important function is provided on the stator 7. Specifically, the Hall plate 14 is fixed to the stator carrier 701.

[0059] The Hall plate 14 plays a key monitoring function in the operation of the in-wheel motor. It can monitor the rotational speed of the in-wheel motor in real time and accurately.

[0060] When the motor is running, the stator magnetic field changes, and the Hall plate 14 can sensitively sense these magnetic field changes and convert them into electrical signals. By analyzing and processing these electrical signals, the rotational speed information of the motor can be accurately obtained.

[0061] In this embodiment, the ring gear 12, the sun gear 11, and the planet gears 13 all adopt matching helical gears. This choice has significant advantages.

[0062] The unique tooth profile design of helical gears enables them to achieve smoother power transmission when meshing and driving with each other. Compared with traditional spur gears, during operation, the contact of the teeth of helical gears occurs gradually rather than instantaneously in full contact.

[0063] This characteristic of gradual contact greatly reduces the impact during transmission. As a result, when the in-wheel motor is working, the generated vibration is significantly reduced, and the noise also decreases accordingly.

[0064] Combined Figure 6 As shown, a vertical blocking surface 104 is provided on the transmission shaft 1, and one end of the planet carrier 10 abuts against the blocking surface 104. Specifically, a first platform 105 and a second platform 106 with a cylindrical structure are provided on the transmission shaft 1. These two platforms are adjacent to each other, and the diameter of the first platform 105 is significantly larger than that of the second platform 106. The junction of the first platform 105 and the second platform 106 forms a blocking surface 104, which plays a key role in positioning and limiting in the entire installation structure.

[0065] The planet carrier 10 is arranged on the second platform 106 of the transmission shaft 1, and one end thereof tightly abuts against the blocking surface 104. This abutting method not only ensures the accurate position of the planet carrier 10 on the transmission shaft 1 but also effectively prevents the excessive movement of the planet carrier 10 in the axial direction. Through such a design, the planet carrier 10 can remain stable during operation, thus ensuring the reliability and stability of the entire transmission system.

[0066] A key connection method is adopted between the transmission shaft 1 and the planet carrier 10. Specifically, a keyway slot 107 is provided on the second platform 106 of the transmission shaft 1. At the same time, a notch corresponding precisely to the keyway slot 107 is also provided on the planet carrier 10. A key pin is cleverly arranged between the keyway slot 107 and the notch, and through this key component, the firm connection and torque transmission between the transmission shaft 1 and the planet carrier 10 are realized.

[0067] Among them, one end of the keyway slot 107 abuts against the blocking surface 104. This abutting design has multiple advantages. First, it further enhances the position stability of the keyway slot 107, avoiding displacement due to force during transmission. Second, abutting against the blocking surface 104 helps to more evenly disperse the stress generated during transmission, improving the durability of the entire structure.

[0068] In this embodiment, the number of key pin slots 107 is two, and the two key pin slots 107 are distributed at 180 degrees. The 180-degree distribution of the two key pin slots 107 makes the connection between the transmission shaft 1 and the planet carrier 10 more stable and able to withstand greater torque and load.

[0069] In summary, through the above key connection method between the transmission shaft 1 and the planet carrier 10, including accurately set key pin slots 107, corresponding notches, key pins, and reasonable distribution, a stable and efficient transmission connection structure is jointly formed, providing a strong guarantee for the normal operation of the in-wheel motor.

[0070] In summary, the embodiments of the present utility model achieve the following technical effects: Through the structural improvement of the transmission shaft 1, a blocking surface 104 that bulges upward is formed on one side of the planet carrier 10. The above blocking surface 104 has an effective blocking and positioning effect on the planet carrier 10. In cooperation with the key connection, it jointly ensures the stable operation of the planet carrier 10. This dual guarantee mechanism greatly enhances the stability and reliability of the planet carrier 10 during operation. At the same time, the application of snap rings is successfully reduced in terms of technology. The omission of snap rings brings many advantages. At the same time, the ring gear 12, sun gear 11, and planet gears 13 adopt helical gears, which can effectively reduce the noise of the in-wheel motor during operation and improve the comfort of the in-wheel motor application. At the same time, the stator base 103 is used to overcome the axial offset problem of the stator 7 during use.

[0071] Obviously, the above-described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0072] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0073] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order different from those illustrated or described here.

[0074] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A hub motor, characterized in that: It includes a transmission shaft, an end cover rotatably arranged on the transmission shaft through an end cover bearing, a freewheeling base assembly rotatably arranged on the transmission shaft through a housing bearing, a hub being arranged on the end cover and the freewheeling base assembly, the end cover and the hub being connected to form a cavity, the cavity containing a stator fixedly arranged on the transmission shaft, a rotor rotatably arranged on the transmission shaft through a rotor bearing, a planetary carrier fixedly arranged on the transmission shaft, a sun gear fixedly arranged on the rotor, a gear ring fixedly arranged on the inner wall of the hub, the planetary carrier being provided with planetary gears cooperating with the gear ring and the sun gear; a vertical blocking surface being arranged on the transmission shaft, one end of the planetary carrier abutting against the blocking surface; a radially distributed stator base being arranged on the transmission shaft, and the stator being locked on the stator base by bolts.

2. The wheel hub motor according to claim 1, characterized in that: The transmission shaft is provided with a wiring channel communicating with the inner and outer sides of the end cover, and the transmission shaft is provided with a glue injection port communicating with the wiring channel.

3. The wheel hub motor according to claim 2, characterized in that: One end of the glue injection port is communicated with the wiring channel, and the other end is blocked by the end cover bearing.

4. The hub motor according to claim 1, characterized in that: The transmission shaft is provided with a first platform and a second platform of a cylindrical structure, the first platform and the second platform are arranged adjacent to each other and the diameter of the first platform is larger than that of the second platform, the blocking surface is formed at the junction of the first platform and the second platform, the planet carrier is arranged on the second platform of the transmission shaft and one end thereof abuts against the blocking surface, and the transmission shaft and the planet carrier are key-connected.

5. The wheel hub motor according to claim 4, characterized in that: The second platform is provided with a key pin groove, the planet carrier is provided with a notch corresponding to the key pin groove, and a key pin is provided between the key pin groove and the notch.

6. The wheel hub motor according to claim 1, characterized in that: The rotor is rotatably arranged on the transmission shaft through two rotor bearings of the same size and in contact with each other, and the sun gear is fixed on the rotor through screws and abuts against the rotor bearings.

7. The hub motor according to claim 1, characterized in that: A Hall plate is arranged on the stator.

8. The wheel hub motor according to claim 1, characterized in that: The ring gear, sun gear and planetary gears are all matching helical gears.

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