Middle motor based on double motors and electric vehicle

Abstract

The utility model provides a dual-motor-based middle motor and an electric vehicle. The dual-motor-based middle motor comprises a first motor, a second motor, a first speed reduction assembly, a second speed reduction assembly and a planetary speed change assembly, the first speed reduction assembly comprises a first gear, a second gear, a third gear, an output gear and a motor clutch. The first gear is meshed with the output end of the first motor, the first gear is coaxially connected with the second gear, the second gear is meshed with the third gear, and the third gear is meshed with the output gear; the motor clutch is connected to the periphery of an output shaft of the planetary speed change assembly. Wherein the third gear is an idle gear, and the motor clutch can be engaged with / disengaged from the output gear. The torque can be increased, the size of the motor is obviously reduced, and the weight of the motor is reduced. And the third gear adopts an idle gear form, so that the outer diameter of the output gear can be reduced, and the size of the whole motor is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a mid-mounted motor based on dual motors and an electric vehicle. Background Technology

[0002] In the field of electric-assist bicycles, a mid-drive motor refers to a motor that is installed in the middle of the bicycle frame, i.e., at the pedal position. This motor is connected to the frame and transmits power through a chain to the rear wheel. Pedals are installed on both sides of the motor, so that the rider can manually ride the bicycle by pedaling when the motor is not powered.

[0003] Patent document CN114423675A discloses an electric assisted vehicle propulsion system. A crankshaft and a second motor are connected to a planetary gear system via a first input element to form a first input section of the planetary gear system. The first motor is connected to the planetary gear system via a sun gear to form a second input section. However, this design, with both motors located outside the central shaft, significantly increases the overall size and weight of the mid-mounted motor. Furthermore, the output torque of this solution is limited; increasing the output torque would require increasing the motor's size, making it impractical for widespread application. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a mid-mounted motor and electric vehicle based on dual motors.

[0005] According to the present invention, a mid-drive motor based on dual motors includes: a first motor, a second motor, a first reduction gear assembly, a second reduction gear assembly, and a planetary gear transmission assembly;

[0006] The first reduction gear assembly includes: a first gear, a second gear, a third gear, an output gear, and a motor clutch;

[0007] The first gear meshes with the output end of the first motor; the first gear is coaxially connected with the second gear; the second gear meshes with the third gear; and the third gear meshes with the output gear.

[0008] The motor clutch is connected to the outer periphery of the output shaft of the planetary gear transmission assembly;

[0009] The third gear is an idler gear, and the motor clutch can engage / disengage with the output gear.

[0010] The first motor is located outside the central shaft;

[0011] The second motor is mounted on the central shaft and meshes with the input end of the planetary gear transmission assembly through the second reduction assembly.

[0012] Furthermore, the planetary transmission assembly includes: an output shaft, a central shaft, a first planetary support, a first planetary gear, and a pedal clutch;

[0013] The first planetary carrier is movably mounted on the central shaft, the first planetary gear is connected to one side of the first planetary carrier, the two ends of the central shaft are used to connect the pedal crank, the pedal clutch is fixedly connected to the central shaft and can engage / disengage with the other side of the first planetary carrier, the output shaft is rotatably connected to the central shaft through the second bearing, and the inner wall of the output shaft is provided with a second internal gear ring that meshes with the first planetary gear.

[0014] Furthermore, the second reduction assembly includes: a second planetary carrier 21, a second planetary gear, and a first internal gear ring;

[0015] The second planetary gear is rotatably connected to one side of the second planetary support 21 via a third bearing, and the first internal gear ring is fixedly connected to the housing assembly of the continuously variable transmission motor and meshes with the second planetary gear.

[0016] The second planetary support 21 is movably mounted on the central shaft, and the other side of the second planetary support 21 has a first central gear, which meshes with the first planetary gear.

[0017] Furthermore, the first motor includes: a first stator core, a first rotor core, a first magnet, a first winding, a first motor shaft, a seventh bearing, and an eighth bearing;

[0018] The first magnet is connected to the first stator core or the first rotor core. The first stator core is wrapped around the outside of the first rotor core. The first winding is connected to the slot of the first stator core. The first rotor core is connected to the first motor shaft. The first motor shaft is rotatably connected to the housing assembly of the continuously variable transmission motor via the seventh bearing and the eighth bearing. One end of the first motor shaft meshes with the first reduction assembly.

[0019] Furthermore, the second motor includes: a second stator core, a second rotor core, a second magnet, a second winding, a second motor shaft, a fourth bearing, and a fifth bearing;

[0020] The second magnet is connected to the second stator core or the second rotor core. The second stator core is wrapped around the outside of the second rotor core. The second winding is connected to the slot of the second stator core. The second rotor core is connected to the second motor shaft. The second motor shaft is rotatably connected to the housing assembly of the continuously variable transmission motor via the fourth bearing. The second motor shaft is rotatably connected to the central shaft via the fifth bearing.

[0021] The end of the second motor shaft is connected to a second central gear, which meshes with the second planetary gear.

[0022] The second central gear is fitted onto the central shaft.

[0023] Furthermore, the mid-drive motor based on dual motors also includes a chainring connected to the outer periphery of the output shaft for driving the chain.

[0024] Furthermore, the continuously variable transmission (CVT) motor also includes a housing assembly, which includes a left housing and a right housing connected to each other, and a partition located between the left housing and the right housing, which separates the first motor, the second motor, the first reduction assembly, the second reduction assembly, and the planetary transmission assembly.

[0025] Furthermore, the first central gear is fitted onto the central shaft.

[0026] An electric vehicle according to the present invention includes a mid-mounted motor based on a dual-motor system.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This invention employs a first motor and a second motor, each using a different reduction system to increase torque. Furthermore, the second motor is an on-shaft motor, which significantly reduces its size and weight. The third gear is an idler gear, which reduces the outer diameter of the output gear, further minimizing the overall size of the motor.

[0029] The fourth bearing is a one-way bearing, which can ensure that the entire vehicle can be driven by manually stepping on the bottom bracket to drive the chainring in the absence of power. Attached Figure Description

[0030] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a cross-sectional view of the present invention;

[0032] In the picture:

[0033] 1-Left housing, 2-First winding, 3-First stator core, 4-Controller, 5-Baffle, 6-Right housing, 7-First gear, 8-Second gear, 9-First motor shaft, 10-Third gear, 11-Output gear, 12-Motor clutch, 13-First bearing, 14-Output shaft, 1401-Second internal gear ring, 15-Crankset, 16-Second bearing, 17-Lower shaft, 18-Pedal clutch, 19-First planetary support, 20-First planetary gear, 21-Second planetary support, 210 1-First central gear, 22-Third bearing, 23-Second planetary gear, 24-First internal gear ring, 25-Tread frequency sensor, 26-Fourth bearing, 27-Second motor shaft, 2701-Second central gear, 28-Second rotor core, 29-Second stator core, 30-Second magnet, 31-Second winding, 32-Fifth bearing, 33-Sixth bearing, 34-Bearing retaining ring, 35-Seventh bearing, 36-Eighth bearing, 37-First rotor core, 38-First magnet, 39-Rear cover. Detailed Implementation

[0034] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0035] like Figure 1 As shown, this utility model provides a mid-drive motor based on dual motors, comprising: a first motor, a second motor, a first reduction gear assembly, a second reduction gear assembly, and a planetary gear transmission assembly. The first motor is located outside the central shaft 17, and the second motor is sleeved on the central shaft 17, meshing with the input end of the planetary gear transmission assembly through the second reduction gear assembly.

[0036] The first reduction gear assembly includes a first gear 7, a second gear 8, a third gear 10, an output gear 11, and a motor clutch 12. The first gear 7 meshes with the output end of the first motor, is coaxially connected to the second gear 8, meshes with the third gear 10, and the third gear 10 meshes with the output gear 11. The motor clutch 12 is connected to the outer circumference of the output shaft 14 of the planetary gearbox assembly. The third gear 10 is an idler gear, designed to reduce the diameter of the output gear 11. The function of the first reduction gear assembly is to increase the torque of the first motor. The motor clutch 12 can engage / disengage with the output gear 11.

[0037] The planetary gearbox assembly includes an output shaft 14, a bottom bracket 17, a first planetary carrier 19, a first planetary gear 20, and a pedal clutch 18. The first planetary carrier 19 is movably mounted on the bottom bracket 17. The first planetary gear 20 is connected to one side of the first planetary carrier 19. Both ends of the bottom bracket 17 are used to connect to the pedal cranks. The pedal clutch 18 is fixedly connected to the bottom bracket 17 and can engage / disengage with the other side of the first planetary carrier 19. The output shaft 14 is rotatably connected to the bottom bracket 17 via a second bearing 16, and the inner wall of the output shaft 14 is provided with a second internal gear ring 1401 that meshes with the first planetary gear 20. As the speed of the first motor changes, the speed of the first center gear 2101 on the second planetary carrier 21 also changes, thereby changing the gear ratio of the planetary gearbox assembly, and ultimately changing the gear ratio between the chainring 15 and the bottom bracket 17. This allows the bottom bracket 17 to maintain a comfortable cadence when climbing hills or riding at high speeds on flat roads, improving riding comfort. The chain 15 is connected to the outer periphery of the output shaft 14 and is used to drive the chain.

[0038] The second reduction assembly includes a second planetary carrier 21, a second planetary gear 23, and a first internal gear ring 24. The second planetary gear 23 is rotatably connected to one side of the second planetary carrier 21 via a third bearing 22. The first internal gear ring 24 is fixedly connected to the housing assembly of the continuously variable transmission (CVT) motor and meshes with the second planetary gear 23. The second planetary carrier 21 is movably mounted on a central shaft 17. A first central gear 2101 is located on the other side of the second planetary carrier 21 and is mounted on the central shaft 17. The first central gear 2101 meshes with the first planetary gear 20. The purpose of the second reduction assembly is to increase the torque of the second motor.

[0039] The first motor includes: a first stator core 3, a first rotor core 37, a first magnet 38, a first winding 2, a first motor shaft 9, a seventh bearing 35, and an eighth bearing 36. The first magnet 38 is connected to either the first stator core 3 or the first rotor core 37. The first stator core 3 surrounds the outside of the first rotor core 37. The first winding 2 is connected to a slot in the first stator core 3. The first rotor core 37 is connected to the first motor shaft 9. The first motor shaft 9 is rotatably connected to the housing assembly of a continuously variable transmission (CVT) motor via the seventh bearing 35 and the eighth bearing 36, and one end of the first motor shaft 9 meshes with a first reduction gear assembly. The first motor functions as an auxiliary drive motor, primarily providing auxiliary drive during bicycle starting or climbing.

[0040] The second motor includes: a second stator core 29, a second rotor core 28, a second magnet 30, a second winding 31, a second motor shaft 27, a fourth bearing 26, and a fifth bearing 32. The second magnet 30 is connected to either the second stator core 29 or the second rotor core 28. The second stator core 29 surrounds the outside of the second rotor core 28. The second winding 31 is connected to a slot in the second stator core 29. The second rotor core 28 is connected to the second motor shaft 27. The second motor shaft 27 is rotatably connected to the housing assembly of the continuously variable transmission (CVT) motor via the fourth bearing 26. The second motor shaft 27 is rotatably connected to the central shaft 17 via the fifth bearing 32. A second central gear 2701 is connected to the end of the second motor shaft 27. The second central gear 2701 is sleeved on the central shaft 17 and meshes with a second planetary gear 23. The second motor functions as a speed-changing motor, main drive motor, and torque sensor. Adjusting its speed changes the gear ratio of the planetary gear system, altering the gear ratio between the bottom bracket 17 and the chainring 15 when pedaling. This allows the bottom bracket 17 to maintain a comfortable cadence during uphill or high-speed riding on flat roads, improving riding comfort. The fourth bearing 26 is a one-way bearing, allowing only the second rotor core 28 to rotate in one direction. When the bike is without power, the fourth bearing 26 is locked, and the planetary gear system operates at a fixed gear ratio. When pedaling the bottom bracket 17, it drives the chainring 15 through the planetary gear system, propelling the bicycle forward.

[0041] The housing assembly includes a left housing 1 and a right housing 6 connected to each other, and a partition 5 located between the left housing 1 and the right housing 6, which separates the first motor, the second motor, the first reduction gear assembly, the second reduction gear assembly, and the planetary gear transmission assembly. The first internal gear ring 24 of the second reduction gear assembly is fixedly connected to the partition 5.

[0042] The working principle of this utility model is as follows:

[0043] When the first and second motors are operating, the second motor shaft 27 drives the second planetary gear 23 of the second reduction assembly via the second central gear 2701. Since the first internal gear ring 24 is fixed on the partition 5, the second planetary gear 23 rotates around the second motor shaft 27, thereby driving the second planetary carrier 21 to rotate synchronously. At this time, the first central gear 2101 of the second planetary carrier 21 drives the first planetary gear 20 of the planetary transmission assembly, and the first planetary gear 20 drives the output shaft 14 via the second internal gear ring 1401. In addition, the motor clutch 12 meshes with the output gear 11, and the first motor shaft 9 drives the output shaft 14 via the first reduction assembly. At this time, the pedal clutch 18 can mesh with the first planetary carrier 19, and the mid-mounted motor provides power assistance. The pedal clutch 18 can also disengage from the first planetary carrier 19, and the mid-mounted motor provides pure electric drive.

[0044] When the first and second motors are not operating, i.e., when only manual pedaling is involved, the pedal clutch 18 engages with the first planetary support 19, and the motor clutch 12 disengages from the output gear 11. At this time, manual pedaling drives the central shaft 17 to rotate, and the central shaft 17 drives the first planetary support 19 to rotate via the pedal clutch 18. Since the second motor is not operating at this time, combined with the torque of the second motor in its stationary state, the first planetary gear 20 can drive the output shaft 14 to rotate. The connection between the first motor, the first reduction gear assembly, and the output shaft 14 is disconnected, avoiding the problem of excessive torque requiring manual pedaling.

[0045] In other embodiments, the controller 4 is electrically connected to the first motor and the second motor to control their outputs. The cadence sensor 25 is electrically connected to the controller 4 and is connected to the center axle 17 to detect the cadence of the center axle 17. The controller 4 can be independently installed outside the left housing 1 and then sealed between the left housing 1 and the rear cover 39, but this invention is not limited to this installation structure.

[0046] The mid-drive motor based on dual motors of this invention can be applied to various electric vehicles, such as electric-assisted bicycles.

[0047] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A mid-drive motor based on dual motors, characterized in that, include: The first motor, the second motor, the first reduction gear assembly, the second reduction gear assembly, and the planetary gear transmission assembly; The first reduction gear assembly includes: a first gear (7), a second gear (8), a third gear (10), an output gear (11), and a motor clutch (12); The first gear (7) meshes with the output end of the first motor, the first gear (7) is coaxially connected with the second gear (8), the second gear (8) meshes with the third gear (10), and the third gear (10) meshes with the output gear (11); The motor clutch (12) is connected to the outer periphery of the output shaft (14) of the planetary gear transmission assembly; Among them, the third gear (10) is an idler gear, and the motor clutch (12) can engage / disengage with the output gear (11); The first motor is located outside the central shaft (17); The second motor is mounted on the central shaft (17) and meshes with the input end of the planetary gear transmission assembly through the second reduction assembly.

2. The mid-drive motor based on dual motors according to claim 1, characterized in that, The planetary transmission assembly includes: an output shaft (14), a central shaft (17), a first planetary carrier (19), a first planetary gear (20), and a pedal clutch (18); The first planetary carrier (19) is movably mounted on the central shaft (17). The first planetary gear (20) is connected to one side of the first planetary carrier (19). The two ends of the central shaft (17) are used to connect the pedal crank. The pedal clutch (18) is fixedly connected to the central shaft (17) and can engage / disengage with the other side of the first planetary carrier (19). The output shaft (14) is rotatably connected to the central shaft (17) through the second bearing (16). The inner wall of the output shaft (14) is provided with a second internal gear ring (1401) that meshes with the first planetary gear (20).

3. The mid-drive motor based on dual motors according to claim 2, characterized in that, The second reduction assembly includes: a second planetary carrier (21), a second planetary gear (23), and a first internal gear ring (24); The second planetary gear (23) is rotatably connected to one side of the second planetary support (21) via the third bearing (22), and the first internal gear ring (24) is fixedly connected to the housing assembly of the mid-mounted motor and meshes with the second planetary gear (23); The second planetary support (21) is movably mounted on the central shaft (17), and the other side of the second planetary support (21) has a first central gear (2101), which meshes with the first planetary gear (20).

4. The mid-drive motor based on dual motors according to claim 1, characterized in that, The first motor includes: a first stator core (3), a first rotor core (37), a first magnet (38), a first winding (2), a first motor shaft (9), a seventh bearing (35), and an eighth bearing (36); The first magnet (38) is connected to the first stator core (3) or the first rotor core (37). The first stator core (3) is wrapped around the outside of the first rotor core (37). The first winding (2) is connected to the slot of the first stator core (3). The first rotor core (37) is connected to the first motor shaft (9). The first motor shaft (9) is rotatably connected to the housing assembly of the mid-mounted motor through the seventh bearing (35) and the eighth bearing (36). One end of the first motor shaft (9) meshes with the first reduction assembly.

5. The mid-drive motor based on dual motors according to claim 3, characterized in that, The second motor includes: a second stator core (29), a second rotor core (28), a second magnet (30), a second winding (31), a second motor shaft (27), a fourth bearing (26), and a fifth bearing (32); The second magnet (30) is connected to the second stator core (29) or the second rotor core (28). The second stator core (29) is wrapped around the outside of the second rotor core (28). The second winding (31) is connected to the slot of the second stator core (29). The second rotor core (28) is connected to the second motor shaft (27). The second motor shaft (27) is rotatably connected to the housing assembly of the mid-mounted motor through the fourth bearing (26). The second motor shaft (27) is rotatably connected to the central shaft (17) through the fifth bearing (32). The end of the second motor shaft (27) is connected to a second central gear (2701), which meshes with the second planetary gear (23).

6. The mid-drive motor based on dual motors according to claim 5, characterized in that, The second central gear (2701) is fitted onto the central shaft (17).

7. The mid-drive motor based on dual motors according to claim 2, characterized in that, The mid-mounted motor based on dual motors also includes a chainring (15), which is connected to the outer periphery of the output shaft (14) and is used to drive the chain.

8. The mid-drive motor based on dual motors according to claim 1, characterized in that, The mid-mounted motor also includes a housing assembly, which includes a left housing (1) and a right housing (6) connected to each other, and a partition (5) located between the left housing (1) and the right housing (6). The partition (5) separates the first motor, the second motor, the first reduction assembly, the second reduction assembly, and the planetary gear transmission assembly.

9. The mid-drive motor based on dual motors according to claim 3, characterized in that, The first central gear (2101) is mounted on the central shaft (17).

10. An electric vehicle, characterized in that, Including the mid-drive motor based on dual motors as described in any one of claims 1-9.

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