Middle motor and bicycle
By setting magnetic parts on the input shaft of the reducer, the structure of the mid -to -central motor is simplified and the reductioner is arranged inside the midfield motor. Flexibility and lightness.
Patent Information
- Application Number
- CN202411909802.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-01-28
AI Technical Summary
The existing mid-mounted motor is larger in size and heavier in weight, which affects the flexibility and lightness of the bicycle.
By setting magnetic parts on the input shaft of the reducer, it is also used as a rotor at the same time, eliminating the rolling shaft and rotor structure of the motor center, simplifying the structure of the middle motor, and arranging the reduction in the interior of the mid -to -center motor to reduce Small overall volume.
The lightweight and volume of the medium -to -place motor is realized, the flexibility and lightness of the bicycle are improved, and the power density is improved.
Smart Images
Figure CN119370243A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of bicycles, and in particular to a mid-mounted motor and a bicycle. Background Art
[0002] Mid-mounted motors are one of the most commonly used drive systems for bicycles. Compared with other drive types (such as hub motors), mid-mounted motors have better power transmission efficiency and driving experience, and are widely used in high-performance bicycles such as mountain bikes and urban commuter bikes.
[0003] However, the existing mid-mounted motor is large in size and heavy in weight, which makes the bicycle not flexible enough to control, not light enough to ride, and the appearance is bulky and not beautiful enough.
[0004] It should be noted that the statements in this background technology section only provide background technology related to the present application and do not necessarily constitute prior art. Summary of the invention
[0005] The present application provides a mid-mounted motor and a bicycle to improve the flexibility of the bicycle.
[0006] The first aspect of the present application provides a mid-mounted motor for a bicycle, comprising:
[0007] The casing is constructed as a cylindrical structure;
[0008] A first end cover, comprising a cover body and a hollow shaft, wherein the hollow shaft extends along the axial direction of the casing, the cover body is used to cover the first end of the casing, and the hollow shaft is located in the casing;
[0009] A reducer is arranged in the housing, the reducer comprises an input shaft, an output part and a plurality of mounting grooves, the input shaft is drivingly connected with the output part, the input shaft is used to drive the output part to rotate, the output part is used to transmit power to the bicycle, the input shaft is rotatably sleeved on the radial outer side of the hollow shaft, the plurality of mounting grooves are circumferentially spaced on the surface of the input shaft, and the plurality of mounting grooves are used to arrange magnetic members; and
[0010] The stator is arranged on the inner wall of the casing and located radially outside the input shaft. The stator is used to drive the magnetic part to drive the input shaft to rotate based on the principle of electromagnetic induction.
[0011] In some embodiments, the bicycle includes a rotatable chainring, which is connected to the rear wheel of the bicycle through a chain, and the chainring is used to drive the rear wheel to rotate so that the bicycle moves. The mid-mounted motor also includes a clutch, and the clutch includes a disc-shaped structure and a connecting portion, which is connected to the chainring for transmission. The reducer also includes a reducer housing, and the input shaft is located at the end of the reducer housing, and the output portion is arranged on the inner side of the reducer housing. The disc-shaped structure is rotatably arranged on the radial inner side of the reducer housing, and the connecting portion is arranged at an end of the disc-shaped structure that is away from the first end cover. The disc-shaped structure is connected to the output portion so as to rotate with the output portion, and the disc-shaped structure and the connecting portion are configured to be able to fit or disengage so that the on and off state of the power output of the output portion to the chainring can be controlled.
[0012] In some embodiments, the mid-mounted motor further includes a first annular step disposed on the inner wall of the casing, the reducer housing is constructed as a cylindrical structure, and the first annular step is used to abut against the radial outer edge of the reducer housing to axially limit the reducer housing.
[0013] In some embodiments, the reducer further includes an encoder mounting groove disposed on an outer surface of the input shaft, the encoder mounting groove extends in a circumferential direction of the input shaft, and the encoder mounting groove is used to mount an encoder.
[0014] In some embodiments, the encoder mounting slot is closer to the first end cap in the axial direction of the input shaft relative to the mounting slot.
[0015] In some embodiments, the first end cover further includes a second annular step, which is disposed on the surface of the hollow shaft close to the cover body, and is used to abut against the end surface of the input shaft to axially limit the input shaft.
[0016] In some embodiments, the first end cover also includes a heat dissipation boss arranged on the inner end surface of the cover body, the inner end surface faces the interior of the casing, and the central motor also includes a motor driver, which is arranged in the casing and contacts the heat dissipation boss, and the heat dissipation boss is used to conduct heat to the motor driver to dissipate heat.
[0017] In some embodiments, the first end cover further includes reinforcing ribs disposed on an outer end surface of the cover body, and the outer end surface faces away from the interior of the housing.
[0018] In some embodiments, the central motor further includes a limiting boss, which is arranged on the inner wall of the casing and protrudes from the inner wall of the casing toward the axis of the casing in the radial direction of the casing, and the limiting boss is used to limit the axial position of the stator.
[0019] In some embodiments, the limiting boss is further constructed to extend along the axial direction of the housing, a threaded hole extending along the axial direction of the housing is provided in the limiting boss, and the stator is configured to be threadedly connected to the limiting boss through the threaded hole.
[0020] A second aspect of the present application provides a bicycle, comprising the mid-mounted motor as described above, wherein the mid-mounted motor is installed at the center axis of the bicycle, and the mid-mounted motor is configured to drive the bicycle to move forward.
[0021] Based on the technical solution provided in the present application, the mid-mounted motor includes a casing, a first end cover, a reducer and a stator. The casing is constructed as a cylindrical structure. The first end cover includes a cover body and a hollow shaft. The hollow shaft extends along the axial direction of the casing. The cover body is used to cover the first end of the casing. The hollow shaft is located in the casing. The reducer is arranged in the casing. The reducer includes an input shaft, an output part and a plurality of mounting grooves. The input shaft is transmission-connected to the output part. The input shaft is used to drive the output part to rotate. The output part is used to transmit power to the bicycle. The input shaft is rotatably sleeved on the radial outer side of the hollow shaft. A plurality of mounting grooves are circumferentially spaced on the surface of the input shaft. A plurality of mounting grooves are used to arrange magnetic parts. The stator is arranged on the inner wall of the casing and is located radially outside the input shaft. The stator is used to drive the magnetic part to drive the input shaft to rotate based on the principle of electromagnetic induction. Compared with the traditional mid-mounted motor, the motor shaft and rotor structure set in the center of the motor are omitted. By setting a magnetic part on the input shaft of the reducer, the input shaft of the reducer is formed into a rotor at the same time, making the mid-mounted motor hollow, simplifying the structure of the mid-mounted motor, increasing the power density of the mid-mounted motor, making the weight of the mid-mounted motor lighter, and improving the flexibility of the bicycle. In addition, the reducer is arranged inside the mid-mounted motor, which can reduce the overall volume of the mid-mounted motor and the reducer, thereby making the bicycle more flexible and light.
[0022] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0024] Figure 1 This is an exploded diagram of the mid-mounted motor in some embodiments of the present application.
[0025] Figure 2 for Figure 1 Side view of the housing in FIG.
[0026] Figure 3 for Figure 1 A cross-sectional view of the casing in FIG.
[0027] Figure 4 This is a side view after the stator is set in the casing.
[0028] Figure 5 for Figure 4 sectional view of .
[0029] Figure 6 for Figure 1 Side view of the first end cap in FIG.
[0030] Figure 7 for Figure 1 A cross-sectional view of the first end cover in FIG.
[0031] Figure 8 A cross-sectional view of a first end of the housing with a first end cap covering the first end of the housing.
[0032] Fig. 9 for Figure 1 Schematic diagram of the reducer in.
[0033] Fig.10 for Figure 1 Cross-sectional view of the reducer in .
[0034] Fig.11 for Figure 1 Schematic diagram of the clutch.
[0035] Fig.12 A cross-sectional view of the clutch assembled in the reducer housing. DETAILED DESCRIPTION
[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0038] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.
[0039] The inventor of the present application has found that in the prior art, the mid-mounted motor usually includes a motor shaft located in the center, a rotor arranged on the surface of the motor shaft, and a stator located radially outside the rotor. The end of the motor shaft extends from the housing of the mid-mounted motor and is connected to the input shaft of the reducer, and the power is transmitted to the bicycle by the output shaft of the reducer. This solution causes the mid-mounted motor and reducer and other structures to occupy a large space together, and the space at the bicycle's central axis is limited, resulting in the need to design the bicycle frame larger to accommodate the mid-mounted motor and reducer and other components. At the same time, more components will also increase the weight of the bicycle and affect the flexibility of the bicycle.
[0040] For this purpose, refer to Figures 1 to 12 Some embodiments of the present application provide a mid-mounted motor for a bicycle, comprising a housing 1, a first end cover 2, a reducer 3 and a stator 4. The housing 1 is constructed as a cylindrical structure. The first end cover 2 includes a cover body 21 and a hollow shaft 22. The hollow shaft 22 extends along the axial direction of the housing 1. The cover body 21 is used to cover the first end of the housing 1. The hollow shaft 22 is located in the housing 1. The reducer 3 is arranged in the housing 1. The reducer 3 includes an input shaft 32, an output part and a plurality of mounting grooves 33. The input shaft 32 is transmission-connected to the output part. The input shaft 32 is used to drive the output part to rotate. The output part is used to transmit power to the bicycle. The input shaft 32 is rotatably sleeved on the radial outer side of the hollow shaft 22. A plurality of mounting grooves 33 are circumferentially spaced on the surface of the input shaft 32. The plurality of mounting grooves 33 are used to arrange magnetic parts. The stator 4 is arranged on the inner wall of the housing 1 and is located on the radial outer side of the input shaft 32. The stator 4 is used to drive the magnetic component to drive the input shaft 32 to rotate based on the principle of electromagnetic induction.
[0041] Specifically, the housing 1 is constructed as a cylindrical structure with two ends open, the cover body 21 is constructed as a circle to cover the first end of the housing 1, the hollow shaft 22 is located at the center of the cover body 21, and the input shaft 32 is hollow so that the input shaft 32 is sleeved on the outside of the hollow shaft 22, and a bearing (not shown in the figure) is arranged between the input shaft 32 and the hollow shaft 22, and the input shaft 32 is rotatable relative to the hollow shaft 22. The output part of the reducer 3 includes, for example, a plurality of gears, and the kinetic energy of the input shaft 32 is transmitted to the bicycle through the transmission between the gears, and the speed is reduced and the torque is increased during the transmission. The stator 4 is spliced by a plurality of winding core monomers. The stator 4 is arranged in a circle along the inner wall of the housing 1 in the circumferential direction. In the radial direction, the housing 1, the stator 4, the input shaft 32 and the hollow shaft 22 are arranged from the outside to the inside, and the four are coaxially arranged. The magnetic part includes a permanent magnet (such as magnetic steel), and the mounting groove 33 is concave from the surface of the input shaft 32 along the thickness direction of the input shaft 32, so that the permanent magnet is more firmly embedded in the mounting groove 33. The permanent magnet and the input shaft 32 form the rotor of the mid-mounted motor, and the rotor and the reducer 3 are integrated into one. When the mid-mounted motor is powered on, the stator 4 drives the permanent magnet to rotate, thereby driving the input shaft 32 to rotate, and the input shaft 32 drives the output part to rotate, and the output part finally outputs power to the bicycle.
[0042] Compared with the traditional mid-mounted motor, the motor shaft and rotor structure arranged at the center of the motor are omitted, and the input shaft 32 of the reducer 3 is simultaneously formed as a rotor by arranging a magnetic member on the input shaft 32 of the reducer 3, so that the mid-mounted motor is hollow, the structure of the mid-mounted motor is simplified, the power density of the mid-mounted motor is increased, the weight of the mid-mounted motor is lighter, and the flexibility of the bicycle is improved. Moreover, the reducer 3 is arranged inside the mid-mounted motor, which can reduce the overall volume of the mid-mounted motor and the reducer, thereby making the bicycle more flexible and light.
[0043] refer to Figures 9 to 12 In some embodiments, the bicycle includes a rotatable chainring. The chainring is connected to the rear wheel of the bicycle through a chain. The chainring is used to drive the rear wheel to rotate so that the bicycle moves. The mid-mounted motor also includes a clutch 7. The clutch 7 includes a disc-shaped structure 71 and a connecting portion 72. The connecting portion 72 is connected to the chainring. The reducer also includes a reducer housing 31. The input shaft 32 is located at the end of the reducer housing 31. The output portion is arranged on the inner side of the reducer housing 31. The disc-shaped structure 71 is rotatably arranged on the radial inner side of the reducer housing 31. The connecting portion 72 is arranged at one end of the disc-shaped structure 71 facing away from the first end cover 2. The disc-shaped structure 71 is connected to the output portion to rotate with the output portion, and the disc-shaped structure 71 and the connecting portion 72 are configured to be fitted or disengaged so that the on-off state of the power output of the output portion to the chainring is controllable.
[0044] The clutch 7 is integrated into the reducer 3, that is, the clutch 7 is located in the mid-mounted motor, which improves the integration and makes the power output of the mid-mounted motor controllable, so that the bicycle has a power-assisted mode and a human-powered mode. In the power-assisted mode, the disc-shaped structure 71 is fitted with the connecting portion 72, and the mid-mounted motor is energized to drive the input shaft 32 to rotate. The input shaft 32 drives the disc-shaped structure 71 to rotate through the output portion, and the disc-shaped structure 71 drives the connecting portion 72 to rotate, thereby transmitting power to the chainring to drive the rear wheel of the bicycle to rotate. In the human-powered mode, the disc-shaped structure 71 is disconnected from the connecting portion 72. When a person pedals to move, the chainring drives the connecting portion 72 to rotate, and the connecting portion 72 rotates relative to the disc-shaped structure 71, thereby reducing the laborious phenomenon caused by the reverse dragging of the input shaft 32 to rotate when a person pedals.
[0045] refer to Fig.12 In some embodiments, the mid-mounted motor further includes a bearing 10 , and the bearing 10 is located between the disc structure 71 of the clutch 7 and the reducer housing 31 , so that the disc structure 71 can rotate relative to the reducer housing 31 .
[0046] refer to Figure 5 In some embodiments, the central motor further comprises a first annular step 6 disposed on the inner wall of the housing 1. The reducer housing 31 is configured as a cylindrical structure. The first annular step 6 is used to abut against the radial outer edge of the reducer housing 31 to limit the axial position of the reducer housing 31.
[0047] During the process of installing the reducer 3 in the casing 1, the first annular step 6 can axially limit the reducer housing 31 so that the reducer 3 is fixed in the correct position, and the outer diameter of the reducer housing 31 is matched with the inner diameter of the casing 1, so that the inner wall of the casing 1 radially limits the reducer housing 31, thereby improving the position stability of the reducer 3 after installation.
[0048] Further, refer to Figure 7 In some embodiments, the first end cover 2 further includes a second annular step 23. The second annular step 23 is disposed on the surface of the hollow shaft 22 at a position close to the cover body 21. The second annular step 23 is used to abut against the end surface of the input shaft 32 to limit the axial position of the input shaft 32.
[0049] The second annular step 23 extends along the surface of the hollow shaft 22 for a circle to abut against the end face of the input shaft 32 during the installation of the reducer 3. The second annular step 23 cooperates with the first annular step 6 to jointly achieve axial limitation of the reducer 3, effectively improving the position stability of the reducer 3.
[0050] refer to Figure 3 and 6In some embodiments, the first end cover 2 also includes a cover body mounting hole A1 arranged on the radial outer edge of the cover body portion 21, and a cover body threaded hole A2 corresponding to the position of the cover body mounting hole is arranged on the end surface of the first end of the casing 1. The second screw 14 passes through the cover body mounting hole A1 and is threadedly connected with the cover body threaded hole A2 on the casing 1 to fix the first end cover 2 to the first end of the casing 1.
[0051] refer to Figure 7 In some embodiments, the first end cover 2 further includes a heat dissipation boss 24 disposed on the inner end surface of the cover body 21, and the inner end surface faces the interior of the housing 1. The central motor further includes a motor driver 5. The motor driver 5 is disposed in the housing 1 and in contact with the heat dissipation boss 24, and the heat dissipation boss 24 is used to conduct heat to the motor driver 5 to dissipate heat.
[0052] The motor driver 5 receives an external control signal to precisely control the speed and torque of the input shaft 32. The motor driver 5 is a hollow disc-shaped structure that is sleeved on the hollow shaft 22. More specifically, the motor driver 5 is sleeved on the second annular step 23 and is axially located between the cover 21 and the end face of the input shaft 32. The heat dissipation boss 24 protrudes relative to the inner end face of the cover 21 to better contact with the motor driver 5 to dissipate heat from the motor driver 5.
[0053] refer to Fig.10 In some embodiments, the reducer 3 further includes an encoder mounting groove 34 disposed on the outer surface of the input shaft 32. The encoder mounting groove 34 extends in the circumferential direction of the input shaft 32, and the encoder mounting groove 34 is used to mount an encoder.
[0054] The encoder can monitor the current and speed of the central motor in real time to ensure that the motor's operating state is within the control range. The encoder is a hollow disc-shaped structure, and correspondingly, the encoder installation groove 34 is configured as an annular groove, so that the encoder is arranged in the encoder installation groove 34 more stably.
[0055] In some embodiments, the encoder mounting groove 34 is closer to the first end cover 2 in the axial direction of the input shaft 32 relative to the mounting groove 33 .
[0056] Specifically, the motor driver 5 is sleeved on the second annular step 23 and close to the cover body 21, the input shaft 32 is axially limited by the second annular step 23, and the encoder mounting groove 34 is set at the end of the input shaft 32 close to the first end cover 2, so that the encoder can be axially close to the motor driver 5 without contacting it, ensuring that the distance between the magnetic ring on the encoder and the encoder chip on the motor driver 5 is within a reasonable range, so as to improve the working reliability and stability of the motor.
[0057] refer to Figure 6In some embodiments, the first end cover 2 further includes a reinforcing rib 25 disposed on an outer end surface of the cover body 21 , and the outer end surface faces away from the interior of the housing 1 .
[0058] The reinforcing ribs 25 can improve the structural strength of the first end cover 2 and increase the heat dissipation area of the first end cover 2 , so that the heat of the motor driver 5 can be efficiently released to the outside through the heat dissipation boss 24 and the reinforcing ribs 25 .
[0059] refer to Figure 3 In some embodiments, the central motor further includes a limiting boss 8. The limiting boss 8 is disposed on the inner wall of the casing 1 and protrudes from the inner wall of the casing 1 toward the axis of the casing 1 in the radial direction of the casing 1. The limiting boss 8 is used to limit the stator 4 axially.
[0060] The limiting boss 8 can limit the stator 4 axially, so that the stator 4 is installed in the correct position in the axial direction. At the same time, the inner wall of the housing 1 limits the stator 4 radially, thereby improving the stability of the stator 4.
[0061] In some embodiments, a plurality of limiting bosses 8 may be provided, and the plurality of limiting bosses 8 are evenly spaced and distributed along the inner wall of the casing 1 around the axis of the casing 1 to improve the axial limiting effect on the stator 4 .
[0062] In order to further improve the stability of the stator 4, in some embodiments, the limiting boss 8 is also configured to extend along the axial direction of the housing 1. A threaded hole extending along the axial direction of the housing 1 is provided in the limiting boss 8. The stator 4 is configured to be threadedly connected to the limiting boss 8 through the threaded hole.
[0063] The outer ring of the stator 4 is provided with a plurality of circumferentially distributed mounting holes, and the plurality of mounting holes correspond to the circumferential positions of the plurality of limiting bosses 8. After the stator 4 is axially limited by the plurality of limiting bosses 8, the stator 4 is fixed by passing the first screw 12 through the mounting holes on the stator 4 and threadingly connecting with the threaded holes on the limiting bosses 8. Furthermore, the threaded holes on the limiting bosses 8 penetrate the limiting bosses 8 in the axial direction. The first screw 12 is screwed into the threaded hole from the side of the limiting boss 8 close to the reducer 3. The motor driver 5 is also provided with a plurality of motor driver connection holes, and the plurality of motor driver connection holes are circumferentially distributed at the edge of the motor driver. The third screw 13 passes through the motor driver connection hole and is screwed into the threaded hole on the limiting boss 7 close to the first end cover 2 to fix the motor driver 5 on the housing 1.
[0064] In order to improve the safety and reliability of the installation process of the motor driver 5, refer to Figure 3In some embodiments, an axially extending countersunk hole B is provided on the end face of the first end of the housing 1, the countersunk hole corresponds to the limiting boss 8 in the circumferential direction, and the bottom surface of the countersunk hole is provided with an opening smaller than the screw head of the third screw 13, so that in the process of screwing in the third screw 13, the threaded section of the third screw 13 can pass through the opening on the bottom surface of the countersunk hole and be screwed into the threaded hole on the limiting boss 8. At the same time, the bottom surface of the countersunk hole limits the screw head of the third screw 13 to prevent the motor driver 5 from being damaged by over-screwing the third screw 13.
[0065] refer to Figure 1 In some embodiments, the mid-mounted motor further comprises a second end cover 9 and a sleeve 11, wherein the second end cover 9 covers the second end of the housing 1, and the second end cover 9 is hollow, and the sleeve 11 is rotatably arranged in the hollow area of the second end cover 9 through a bearing 10. A joint portion is arranged on the sleeve 11, and the joint portion is used to be nested with the connecting portion 72 of the clutch 7, so that the connecting portion 72 can rotate together with the sleeve 11, and the sleeve 11 rotates synchronously with the chainring. Therefore, by arranging the sleeve 11 matching the clutch at the center of the second end of the mid-mounted motor, the power of the mid-mounted motor can be transmitted to the chainring, and the entire mid-mounted motor has a simple structure and a small volume, making the bicycle flexible and light.
[0066] In some embodiments, the reducer 3 is configured as an RV reducer. The input shaft 32 is the crankshaft of the RV reducer. A circle of pins is arranged on the inner ring of the reducer housing 31. At the same time, a circle of pin holes is arranged on the outer ring of the disc structure 71 of the clutch 7. The disc structure 71 is installed in the reducer housing 31 through the pin holes, thereby ensuring the concentricity of the clutch 7 and the reducer 3.
[0067] In some embodiments, the outer wall of the housing 1 is constructed as a corrugated structure to increase the heat dissipation area and improve the heat dissipation capacity of the central motor.
[0068] In some embodiments, a signal line outlet is provided on the housing 1, and the signal line extends from the housing 1 through the signal line outlet and is connected to a wheel speed sensor, an instrument panel, etc. The mid-mounted motor also includes a wire sheath 17, which is used to close the signal line outlet.
[0069] The present application also provides a bicycle, comprising the mid-mounted motor as described above, the mid-mounted motor being installed at the middle axis of the bicycle, and the mid-mounted motor being configured to drive the bicycle to move forward. The mid-mounted motor provided by the present application can reduce the weight of the bicycle, making the bicycle more flexible and light.
[0070] It is worth noting that the bicycle is configured as a power-assisted bicycle, which has a human-powered mode and a power-assisted mode. A control button is provided on the power-assisted bicycle, and the disc-shaped structure 71 and the connecting part 72 of the clutch 7 can be fitted or disengaged by operating the control button. When the control disc-shaped structure 71 and the connecting part 72 are fitted, the power-assisted bicycle is in the power-assisted mode, and the mid-mounted motor can drive the power-assisted bicycle to move forward. When the control disc-shaped structure 71 and the connecting part 72 are disengaged, the power-assisted bicycle is in the human-powered mode, the mid-mounted motor does not work, and when the pedal of the power-assisted bicycle is stepped on, it will not act in the reverse direction on the mid-mounted motor.
[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present application, which should be included in the scope of the technical solution for protection in the present application.
Claims
1. A mid-mounted motor for a bicycle, characterized in that: include: A casing (1), wherein the casing (1) is constructed as a cylindrical structure; A first end cover (2), comprising a cover body (21) and a hollow shaft (22), wherein the hollow shaft (22) extends along the axial direction of the housing (1), the cover body (21) is used to cover the first end of the housing (1), and the hollow shaft (22) is located inside the housing (1); a reducer (3) disposed in the housing (1), the reducer (3) comprising an input shaft (32), an output part and a plurality of mounting grooves (33), the input shaft (32) being drivingly connected to the output part, the input shaft (32) being used to drive the output part to rotate, the output part being used to transmit power to the bicycle, the input shaft (32) being rotatably sleeved on the radially outer side of the hollow shaft (22), the plurality of mounting grooves (33) being circumferentially spaced apart on the surface of the input shaft (32), and the plurality of mounting grooves (33) being used to arrange magnetic parts; and A stator (4) is arranged on the inner wall of the housing (1) and is located radially outside the input shaft (32); the stator (4) is used to drive the magnetic component to drive the input shaft (32) to rotate based on the principle of electromagnetic induction.
2. The mid-mounted motor according to claim 1, characterized in that: The bicycle comprises a rotatable chainring, the chainring is transmission-connected to the rear wheel of the bicycle via a chain, the chainring is used to drive the rear wheel to rotate so as to move the bicycle, the mid-mounted motor further comprises a clutch (7), the clutch (7) comprises a disc-shaped structure (71) and a connecting portion (72), the connecting portion (72) being transmission-connected to the chainring, the reducer further comprises a reducer housing (31), the input shaft is located at an end of the reducer housing (31), the output portion is arranged on the inner side of the reducer housing (31), the disc-shaped structure (71) is rotatably arranged on the radial inner side of the reducer housing (31), the connecting portion (72) is arranged at an end of the disc-shaped structure (71) facing away from the first end cover (2), the disc-shaped structure (71) is connected to the output portion so as to rotate with the output portion, and the disc-shaped structure (71) and the connecting portion (72) are configured to be fitted or disengaged so that the on-off state of the power output of the output portion to the chainring is controllable.
3. The mid-mounted motor according to claim 2, characterized in that: It also includes a first annular step (6) arranged on the inner wall of the housing (1); the reducer housing (31) is constructed as a cylindrical structure; the first annular step (6) is used to abut against the radial outer edge of the reducer housing (31) to axially limit the reducer housing (31).
4. The mid-mounted motor according to claim 1, characterized in that: The reducer (3) further comprises an encoder mounting groove (34) arranged on the outer surface of the input shaft (32), the encoder mounting groove (34) extending in the circumferential direction of the input shaft (32), and the encoder mounting groove (34) is used to mount an encoder.
5. The mid-mounted motor according to claim 4, characterized in that: The encoder mounting groove (34) is close to the first end cover (2) in the axial direction of the input shaft (32) relative to the mounting groove (33).
6. The mid-mounted motor according to claim 1, characterized in that: The first end cover (2) further comprises a second annular step (23), the second annular step (23) being arranged on the surface of the hollow shaft (22) at a position close to the cover body (21), the second annular step (23) being used to abut against an end surface of the input shaft (32) to axially limit the input shaft (32).
7. The mid-mounted motor according to claim 1, characterized in that: The first end cover (2) further comprises a heat dissipation boss (24) arranged on the inner end surface of the cover body (21), the inner end surface facing the interior of the housing (1), the central motor further comprises a motor driver (5), the motor driver (5) being arranged in the housing (1) and in contact with the heat dissipation boss (24), the heat dissipation boss (24) being used to conduct heat to the motor driver (5) to dissipate heat.
8. The mid-mounted motor according to claim 7, characterized in that: The first end cover (2) further comprises a reinforcing rib (25) arranged on an outer end surface of the cover body (21), the outer end surface facing away from the interior of the housing (1).
9. The mid-mounted motor according to any one of claims 1 to 8, characterized in that: It also comprises a limiting boss (8), wherein the limiting boss (8) is arranged on the inner wall of the casing (1) and protrudes from the inner wall of the casing (1) towards the axis of the casing (1) in the radial direction of the casing (1), and the limiting boss (8) is used to limit the axial position of the stator (4).
10. The mid-mounted motor according to claim 9, characterized in that: The limiting boss (8) is also configured to extend in the axial direction of the housing (1); a threaded hole extending in the axial direction of the housing (1) is provided in the limiting boss (8); and the stator (4) is configured to be threadedly connected to the limiting boss (8) via the threaded hole.
11. A bicycle, characterized in that: The bicycle comprises the mid-mounted motor according to any one of claims 1 to 10, wherein the mid-mounted motor is installed at the middle axis of the bicycle, and the mid-mounted motor is configured to drive the bicycle to move forward.