Power-assisted motor system mounted on bottom bracket of bicycle and power-assisted motor of power-assisted motor system

Abstract

The utility model discloses a power-assisted motor system installed on a bottom bracket of a bicycle and a power-assisted motor thereof, the power-assisted motor system comprises a motor body, a central shaft is arranged in the center of the motor body in a penetrating manner, the central shaft is used for penetrating through the bottom bracket of the bicycle, and the motor body is provided with a transmission sleeve shaft penetrating into the bottom bracket of the bicycle. The transmission sleeve shaft outputs power of the motor body, a one-way clutch connecting the transmission sleeve shaft and the center shaft is arranged between the transmission sleeve shaft and the center shaft, the transmission sleeve shaft is provided with a linkage piece used for being in linkage with a chain wheel and a chain wheel of a bicycle, and one end of the linkage piece is in circumferential linkage with the transmission sleeve shaft. And the power assisting motor can be directly in threaded connection with the threaded section of the bottom bracket of the bicycle, so that the power assisting motor is convenient to modify, large in torque and better in universality and stability.

Description

Technical Field

[0001] This utility model relates to the field of power-assisted motors, and in particular to a power-assisted motor system and its power-assisted motor that is installed on the bottom bracket of a bicycle. Background Technology

[0002] Bicycles are a common means of transportation used by people in their daily lives. With the continuous development of society and the continuous progress of technology, the types of bicycles have gradually diversified. In order to reduce the physical exertion of riding bicycles and reduce the damage to the meniscus of the knee joint caused by pure human-powered riding, electric-assisted bicycles have gradually emerged. Electric-assisted bicycles mainly use an assist motor installed on the bicycle body to drive the bicycle wheels to rotate, thereby reducing the physical exertion of riding.

[0003] A search revealed that Chinese Patent CN111846102A discloses a mid-drive motor and an electric-assisted bicycle. The mid-drive motor includes a housing, a stator, a rotor assembly, a sun gear, a planetary gear assembly, a first clutch assembly, a second clutch assembly, and a bottom shaft. The stator is fixedly connected to the housing; the rotor is coaxial and rotatably disposed inside the stator; the sun gear is fixedly inserted through the rotor and rotatably connected to the housing; the planetary gear assembly includes an internal gear ring, a double planetary gear meshing with the internal gear ring, and a planet carrier connected to the double planetary gear. The internal gear ring is fixedly connected to the housing, the double planetary gear meshes with the sun gear, and the planet carrier is rotatably connected to the sun gear and fixedly connected to the double planetary gear; the first clutch assembly is fixedly connected to the planet carrier; the second clutch assembly is drively connected to the first clutch assembly; and the bottom shaft extends along the axial direction of the sun gear and is connected to the second clutch assembly.

[0004] However, the aforementioned mid-drive motor has a relatively complex overall structure and a large overall size, and cannot be well adapted for modification on conventional bicycles. Utility Model Content

[0005] In order to achieve the goal of small size and high versatility, this application provides an assist motor.

[0006] This application provides an assist motor, which adopts the following technical solution:

[0007] An assist motor includes a motor body with a central shaft passing through its center. The central shaft passes through the bottom bracket of a bicycle. The motor body has a transmission sleeve shaft that passes through the bottom bracket of the bicycle. The transmission sleeve shaft outputs power to the motor body. A one-way clutch is provided between the transmission sleeve shaft and the central shaft to connect the two. The transmission sleeve shaft has a linkage member for linkage with the chainring sprocket of the bicycle. One end of the linkage member is circumferentially linked with the transmission sleeve shaft.

[0008] Optionally, the motor body includes a housing having a connection portion for threaded connection with a bicycle bottom bracket.

[0009] Optionally, the motor body also includes a stator and a rotor, and a reducer is provided between the rotor and the transmission sleeve shaft to drive the two.

[0010] Optionally, the reducer includes a central gear, planetary gears, a planetary carrier, and a gear ring. The gear ring is fixedly mounted on the housing. The central gear is connected to the motor rotor and rotates synchronously. One side of the planetary gear meshes with the central gear, and the other side meshes with the gear ring. The planetary carrier is mounted on the planetary gears and outputs power. The transmission sleeve shaft is connected to the planetary carrier.

[0011] Optionally, the thread tightening direction of the connecting part is opposite to the rotation direction of the transmission sleeve shaft.

[0012] Optionally, the housing includes a casing and a cover plate, the cover plate forming a control chamber between itself and the stator for mounting the controller.

[0013] Optionally, a first bearing is provided between the housing and the central shaft, and a support portion is provided inside the housing, on which a second bearing is sleeved to support the rotor.

[0014] This application also provides a power assist motor system installed on the bottom bracket of a bicycle, which has the advantages of simple structure, small size and strong versatility, and adopts the following technical solution:

[0015] A power assist motor system installed on the bottom bracket of a bicycle includes the aforementioned power assist motor, as well as a chainring sprocket and a crank. The crank is mounted at both ends of a central shaft, and the chainring sprocket is keyed to a linkage.

[0016] Optionally, it also includes a bearing housing for threaded connection to the bicycle bottom bracket, wherein a third bearing is provided inside the bearing housing to support the linkage.

[0017] Optionally, a limiting nut is threaded to one end of the central shaft away from the motor body, and the limiting nut axially blocks the sprocket.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. The overall structure is simple and compact, and the overall size is small. It can be easily modified on existing bicycles. The power assist motor can be directly threaded onto the threaded section of the bicycle's bottom bracket, which is convenient for modification and has better versatility. 2. With the setting of a one-way clutch, when the motor drives the sprocket to rotate, the central shaft and crank will not rotate, making it easier for people to put their feet on the pedals of the crank, thus achieving a certain degree of energy saving.

[0020] 3. The power assist motor is coaxial with the bicycle's bottom bracket, resulting in better stability during operation. In addition, it uses a planetary reduction gear structure for deceleration, resulting in high torque. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of an embodiment of this application.

[0022] Figure 2 This is a structural diagram of the embodiment of this application after the crank is hidden.

[0023] Figure 3 This is a horizontal exploded view of the reducer in an embodiment of this application.

[0024] Figure 4 This is an exploded view of the reducer from a first-person perspective in an embodiment of this application.

[0025] Figure 5 This is an exploded view of the reducer from a second perspective in an embodiment of this application.

[0026] Figure 6 This is a structural diagram of the one-way clutch in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Chainring sprocket; 2. Crank; 3. Bottom bracket; 4. Motor body; 5. Central shaft; 6. Housing; 7. Stator; 8. Rotor; 9. Drive shaft; 10. Linkage component; 11. One-way clutch; 12. Connecting part; 13. Gear ring; 14. First-stage center gear; 15. Second-stage center gear; 16. First-stage planetary gear; 17. Second-stage planetary gear; 18. First-stage planetary carrier; 19. Second-stage planetary carrier; 20. Housing; 21. Cover plate; 22. Control chamber; 23. First bearing; 24. Support part; 25. Second bearing; 26. Bearing housing; 27. Third bearing; 28. Limit nut; 29. ​​Inner ring; 30. Ratchet ring; 31. Pad; 32. Spring; 33. Cadence sensor. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] A power assist motor system installed on the bottom bracket of a bicycle, such as Figure 1 As shown, the device includes an assist motor, a chainring sprocket 1, and cranks 2. The assist motor is installed on one side of the bicycle bottom bracket 3, and the chainring sprocket 1 is installed on the other side of the bicycle bottom bracket 3. The assist motor includes a motor body 4, with a central shaft 5 passing through the center of the motor body 4. The central shaft 5 passes through the bicycle bottom bracket 3. There are two cranks 2, which are respectively connected to the two ends of the central shaft 5 that pass through the bicycle bottom bracket 3. The cranks 2 are used to install pedals.

[0031] like Figure 1 and Figure 2 As shown, the motor body 4 includes a housing 6, a stator 7, and a rotor 8. The motor body 4 has a transmission sleeve 9 that passes through the bottom bracket 3 of a bicycle. The transmission sleeve 9 and the rotor 8 are connected and driven by a reducer. That is, when the motor body 4 is turned on, the rotor 8 rotates and, after being slowed down by the reducer, finally outputs power through the transmission sleeve 9. A linkage component 10 is connected to the transmission sleeve 9 and rotates circumferentially with it. Circumferential linkage can be achieved by a locking block and slot, or in other embodiments by a key connection. The linkage component 10 is actually a linkage sleeve. The linkage component 10 is keyed to the chainring sprocket 1 to achieve synchronous rotation. Additionally, at the center... A one-way clutch 11 is provided between shaft 5 and transmission sleeve shaft 9 to connect the two. The one-way clutch 11 is sleeved on the central shaft 5 and is located between the central shaft 5 and the transmission sleeve shaft 9. When the output sleeve shaft rotates, it will not drive the central shaft 5 to rotate. That is, when the bicycle is driven forward by the motor body 4, the central shaft 5 and the pedals will not rotate. When the output sleeve shaft does not output power, the rotation of the central shaft 5 will drive the transmission sleeve shaft 9 to rotate synchronously. At this time, the bicycle is propelled forward by human pedaling. Power is transmitted to the linkage 10 through the transmission sleeve shaft 9, and finally the transmission chain sprocket 1 rotates to realize the output of power.

[0032] like Figure 1 and Figure 2 As shown, the motor body 4 has a connecting part 12 on the housing 6 for threaded connection with the bicycle bottom bracket 3. Since the bicycle bottom bracket 3 itself has a threaded section, the connecting part 12 can be directly and well connected and adapted to the bicycle bottom bracket 3, thus making it suitable for modification of ordinary bicycles.

[0033] like Figures 2-5As shown, the reducer adopts a planetary gear reduction structure. The reducer includes a central gear, planetary gears, a planet carrier, and a ring gear 13. Multiple reducers can be connected in series to achieve multi-stage reduction as needed. This embodiment illustrates two reducers connected in series. In this embodiment, the central gear includes a first-stage central gear 14 and a second-stage central gear 15. The planetary gears include a first-stage planetary gear 16 and a second-stage planetary gear 17. The planet carrier includes a first-stage planet carrier 18 and a second-stage planet carrier 19. The first-stage central gear 14 is fixedly connected to the rotor 8 and rotates with it. The ring gear 13 is fixed inside the housing 6 of the motor body 4. The first-stage planetary gear 16 is located between the first-stage central gear 14 and the ring gear 13. One side of the first-stage planetary gear 16 meshes with the first-stage central gear 14, and the other side meshes with the ring gear 13. Multiple first-stage planetary gears 16 are evenly distributed around the circumference of the first-stage central gear 14. When the first-stage central gear 14 rotates, the first-stage planetary gears... While rotating on its own axis, the first-stage planetary gear 16 rotates circumferentially around the first-stage central gear 14. The first-stage planetary carrier 18 is mounted on the first-stage planetary gear 16 and rotates circumferentially with it to achieve power output. The second-stage central gear 15 is fixedly mounted on the first-stage planetary carrier 18. Multiple second-stage planetary gears 17 are also evenly distributed around the second-stage central gear 15. One side of the second-stage planetary gear 17 meshes with the second-stage central gear 15, and the other side meshes with the gear ring 13. When the second-stage central gear 15 rotates, it drives the second-stage planetary gear 17 to rotate circumferentially around the center of the second-stage central gear 15 while rotating on its own axis. The second-stage planetary carrier 19 is connected to the second-stage planetary gear 17 and rotates with it. The reduced power is output through the second-stage planetary carrier 19. The second-stage planetary carrier 19 is fixed on the transmission sleeve shaft 9 and finally outputs power through the transmission sleeve shaft 9, thus achieving good two-stage reduction. The reducer is integrated into the housing 6 of the motor body 4, making the structure more compact and the overall structure smaller in size.

[0034] like Figure 1 and Figure 2 As shown, the screw tightening direction of the connecting part 12 is opposite to the rotation direction of the transmission sleeve shaft 9. In actual use, when the transmission sleeve shaft 9 rotates and outputs power, it will generate a reaction force to the gear ring 13 on the housing 6. Since the connecting part 12 is also located on the housing 6, the screw of the connecting part 12 will become tighter and tighter during use, and there will be no loosening of the threaded connection, which has better connection stability and reliability.

[0035] like Figure 1 and Figure 2 As shown, the housing 6 includes a shell 20 and a cover plate 21. The cover plate 21 and the shell 20 are detachably connected by screws. The connecting part 12 is located on the outside of the cover plate 21, and the gear ring 13 is located on the inside of the cover plate 21. A control chamber 22 for installing the controller is formed between the cover plate 21 and the stator 7. In this way, the controller is further integrated into the housing 6 of the motor body 4, making the overall structure more compact and smaller in size.

[0036] like Figure 1 and Figure 2 As shown, a first bearing 23 is provided between the housing 6 and the central shaft 5. The housing 20 has a support part 24. A second bearing 25 is sleeved on the support part 24 to support the rotor 8. The design of the first bearing 23 and the second bearing 25 not only provides support but also reduces frictional resistance and improves the smoothness of rotation.

[0037] like Figure 1 and Figure 2 As shown, a bearing seat 26 is provided at the end of the central shaft 5 away from the motor body 4. The bearing seat 26 is located at the linkage 10 and is threadedly connected to the bottom bracket 3 of the bicycle. The bearing seat 26 has a third bearing 27 sleeved on the linkage 10. The third bearing 27 supports the linkage 10 and improves the smoothness of the rotation of the linkage 10. A limit nut 28 is threadedly connected at the end of the central shaft 5 away from the motor body 4. The limit nut 28 is used to axially block the chainring sprocket 1. One side of the chainring sprocket 1 abuts against the third bearing 27, and the other side abuts against the limit nut 28, thereby limiting the installation of the chainring sprocket 1. The chainring sprocket 1 cannot move axially and has better stability.

[0038] like Figure 6 As shown, the one-way clutch 11 includes an inner ring 29, a ratchet ring 30, a pawl 31, and a spring plate 32. The ratchet ring 30 is located on the outer periphery of the inner ring 29 and is circumferentially rotatably connected to the inner ring 29. The inner wall of the ratchet ring 30 has circumferentially distributed one-way teeth. There are three pawls 31 evenly distributed around the circumference. One end of the pawl 31 is rotatably connected to the inner ring 29, and the other end is engaged with the one-way teeth of the ratchet ring 30. The spring plate 32 is disposed on the inner ring 29 to drive the pawl 31 to maintain the engagement state with the one-way teeth. In this embodiment, the ratchet ring 30 is fixed on the transmission sleeve shaft 9, and the inner ring 29 is fixed on the central shaft 5, thereby realizing one-way transmission between the transmission sleeve shaft 9 and the central shaft 5. In other embodiments, the one-way clutch 11 can also adopt a one-way bearing structure.

[0039] like Figure 1 and Figure 2 As shown, a cadence sensor 33 is installed at the end of the central shaft 5 away from the limit nut 28. The cadence sensor 33 can monitor the rider's cadence data in real time and provide it to the controller to control the motor torque output, thereby realizing the power assist function. This helps the rider understand their pedaling rhythm.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An assist motor characterized by: The motor body (4) is provided with a transmission sleeve shaft (9) penetrating into the bicycle five-way pipe (3), the transmission sleeve shaft (9) outputs the power of the motor body (4), and a one-way clutch (11) is arranged between the transmission sleeve shaft (9) and the central shaft (5).

2. A force-assisted electric motor according to claim 1, characterised in that: The motor body (4) comprises a shell (6), and the shell (6) is provided with a connecting portion (12) for threaded connection with the bicycle five-way pipe (3).

3. A torque-assist motor according to claim 2, wherein: The motor body (4) further comprises a stator (7) and a rotor (8), and a reducer is arranged between the rotor (8) and the transmission sleeve shaft (9).

4. A torque-assist motor according to claim 3, wherein: The reducer comprises a central gear, a planetary gear, a planet carrier and a ring gear (13), the ring gear (13) is fixedly arranged on the shell (6), the central gear is connected with the motor rotor (8) to rotate synchronously, the planetary gear is engaged on one side of the central gear and the other side of the ring gear (13), the planet carrier is installed on the planetary gear, the planet carrier outputs power, and the transmission sleeve shaft (9) is connected to the planet carrier.

5. A torque-assist motor according to claim 4, wherein: The threaded tightening direction of the connecting portion (12) is opposite to the rotating direction of the transmission sleeve shaft (9).

6. A torque-assist motor as set forth in claim 3, wherein: The shell (6) comprises a housing (20) and a cover plate (21), and a control chamber (22) for installing a controller is formed between the cover plate (21) and the stator (7).

7. A torque-assist motor according to claim 6, wherein: A first bearing (23) is arranged between the shell (6) and the central shaft (5), the housing (20) is provided with a supporting portion (24), and a second bearing (25) supporting the rotor (8) is sleeved on the supporting portion (24).

8. An assist motor system mounted on a bottom bracket (3) of a bicycle, characterized by: The power-assisted motor comprises the power-assisted motor of any one of claims 1-7, further comprising a sprocket chain wheel (1) and a crank (2), the crank (2) is installed at both ends of the central shaft (5), and the sprocket chain wheel (1) is keyed connected to the linkage (10).

9. A system of an assisting electric motor mounted on a bottom bracket (3) of a bicycle according to claim 8, characterized in that: Further comprising a bearing seat (26) for threaded connection with the bicycle five-way pipe (3), and a third bearing (27) supporting the linkage (10) is arranged in the bearing seat (26).

10. A system of a power assist motor mounted on a bottom bracket (3) of a bicycle according to claim 8, characterized in that: The central shaft (5) is provided with a limiting nut (28) at the end away from the motor body (4), and the limiting nut (28) axially blocks the sprocket chain wheel (1).

Images