Dual-motor continuously variable electric drive system
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CHONGQING CHAOLI HI TECH CO LTD
- Filing Date
- 2025-11-14
- Publication Date
- 2026-06-04
Smart Images
Figure CN2025135189_04062026_PF_FP_ABST
Abstract
Description
Dual-motor continuously variable electric drive system
[0001] Relevant publicly available cross-references
[0002] This disclosure claims priority to Chinese Patent Application No. 2024229426891, entitled "Dual-Motor Continuously Variable Speed Electric Drive System," filed on November 29, 2024, and Chinese Patent Application No. 2024117427421, also entitled "Dual-Motor Continuously Variable Speed Electric Drive System," the entire contents of which are incorporated herein by reference. Technical Field
[0003] This disclosure relates to the field of transmission technology, and more specifically, to a dual-motor continuously variable transmission electric drive system. Background Technology
[0004] Electric bicycles, also known as hybrid bicycles or e-bikes, combine the sporty and recreational aspects of cycling with ease and comfort, and have become increasingly popular in recent years. Most existing electric-assist bicycles have only a single-assist electric drive system, with speed adjusted via the bicycle's gear system. A few manufacturers use traditional gear shifting technology to achieve stepped gear regulation within the electric drive system.
[0005] Most electric bicycles on the market have electric drive systems consisting of a separate motor and transmission mechanism, with a single transmission method that cannot meet the needs of more usage scenarios. Summary of the Invention
[0006] The purpose of this disclosure includes, for example, providing a dual-motor continuously variable electric drive system that can use two motors working together with a planetary gear system to complete the speed change requirement.
[0007] The embodiments of this disclosure can be implemented as follows:
[0008] In a first aspect, this disclosure provides a dual-motor continuously variable transmission (CVT) electric drive system, comprising:
[0009] First motor, second motor, planetary gear system, foot pedal crankshaft, sun gear overrunning clutch, ring gear overrunning clutch;
[0010] The planetary gear system includes planetary gears, a sun gear, a ring gear, and a planet carrier; the planetary gears are circumferentially arranged around the sun gear, and the planetary gears mesh with the sun gear and the ring gear respectively; and the sun gear and / or the ring gear are configured as power inputs, and the planet carrier is configured as a power output.
[0011] The rotor of the first motor can be connected to the sun gear, and the rotor of the second motor can be connected to the gear ring via the gear ring overrunning clutch;
[0012] The foot pedal crankshaft is connected to the sun gear via the sun gear overrunning clutch, so that when torque is input from the foot pedal crankshaft, the sun gear overrunning clutch drives the sun gear to rotate synchronously, while when torque is input from the sun gear, the sun gear overrunning clutch idles and the torque is not transmitted to the foot pedal crankshaft;
[0013] The gear ring overrunning clutch is configured such that when the second motor inputs torque, the gear ring overrunning clutch drives the gear ring to rotate synchronously, but when torque is input from the gear ring, the gear ring overrunning clutch idles and the torque is not transmitted to the second motor;
[0014] When the combined torque of the first motor and the foot pedal crankshaft at the sun gear is greater than the torque output by the second motor to the gear ring, the gear ring is decelerated until it is locked by the gear ring overrunning clutch;
[0015] When the combined torque of the first motor and the foot pedal crankshaft at the sun gear is less than or equal to the torque output by the second motor to the ring gear, the speeds of the first motor and the second motor can be superimposed, and the speed ratio between the foot pedal crankshaft and the planetary carrier can be continuously variable.
[0016] In an optional embodiment, the ring gear overrunning clutch is disposed on the ring gear or the rotor of the second motor.
[0017] In an optional embodiment, it further includes a first motor input gear and a second motor input gear; the rotor of the first motor is connected to the first motor input gear, and the first motor input gear can be connected to the sun gear; the rotor of the second motor is connected to the second motor input gear; and the second motor input gear can be connected to the gear ring.
[0018] In an optional embodiment, it further includes a first motor idler gear and a second motor idler gear; the first motor input gear is connected to the sun gear through the first motor idler gear; the second motor input gear is connected to the gear ring through the second motor idler gear.
[0019] In an optional implementation, the first motor idler wheel and the second motor idler wheel can be coaxially arranged.
[0020] In an optional embodiment, the ring gear overrunning clutch is arranged on the second motor idler wheel.
[0021] In an optional embodiment, the planetary gear train and the pedal crankshaft are kept coaxial.
[0022] In an alternative embodiment, the foot pedal crankshaft passes through the center of the planetary carrier.
[0023] In an optional embodiment, both the sun gear overrunning clutch and the planetary gear train are mounted on the foot pedal crankshaft.
[0024] In an optional implementation, the first motor and the second motor are arranged symmetrically.
[0025] The beneficial effects of the embodiments disclosed herein include, for example:
[0026] The dual-motor continuously variable transmission (CVT) electric drive system of this scheme includes a first motor, a second motor, a planetary gear system, a foot pedal crankshaft, a sun gear overrunning clutch, and a ring gear overrunning clutch. The foot pedal crankshaft and the sun gear of the planetary gear system transmit motion and torque through the sun gear overrunning clutch; torque can only be transmitted from the foot pedal crankshaft to the sun gear. The ring gear is locked by the ring gear overrunning clutch, allowing only unidirectional rotation. The torque of the first motor can be superimposed on the torque of the foot pedal crankshaft. Specifically, when the sum of the torques of the first motor and the foot pedal crankshaft after torque amplification through the planetary gear system is greater than the torque of the second motor after torque amplification through the planetary gear system, the ring gear is decelerated until it is locked by the ring gear overrunning clutch. When the sum of the torques of the first motor and the foot pedal crankshaft after torque amplification through the planetary gear system is less than or equal to the torque of the second motor after torque amplification through the planetary gear system, the speeds of the first and second motors can be superimposed, and the speed ratio between the output shafts of the foot pedal crankshaft can achieve stepless speed regulation. Such a dual-motor continuously variable transmission electric drive system can achieve stepless speed change, and such a system has the advantages of simple structure, easy use and convenient operation. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 is a schematic diagram of the structure of the dual-motor continuously variable electric drive system proposed in an embodiment of this disclosure;
[0029] Figure 2 is a schematic diagram of the structure of the dual-motor continuously variable electric drive system proposed in the embodiment of this disclosure;
[0030] Figure 3 is a schematic diagram of the structure of the dual-motor continuously variable electric drive system proposed in the embodiments of this disclosure.
[0031] Icons: 110 - First motor; 120 - Second motor; 200 - Planetary gear system; 210 - Planetary gear; 220 - Sun gear; 230 - Ring gear; 240 - Planet carrier; 300 - Foot pedal crankshaft; 400 - Sun gear overrunning clutch; 500 - Ring gear overrunning clutch; 710 - First motor input gear; 720 - Second motor input gear; 810 - First motor idler gear; 820 - Second motor idler gear. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0033] Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.
[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0035] In the description of this disclosure, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the disclosed product is usually placed, they are only for the convenience of describing this disclosure 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, and therefore should not be construed as a limitation of this disclosure.
[0036] Furthermore, the terms "first" and "second" are configured only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0037] It should be noted that, where there is no conflict, the features in the embodiments of this disclosure can be combined with each other.
[0038] Please refer to Figure 1. This embodiment provides a dual-motor continuously variable transmission electric drive system, including a first motor 110, a second motor 120, a planetary gear system 200, a foot pedal crankshaft 300, a sun gear overrunning clutch 400, and a ring gear overrunning clutch 500.
[0039] The planetary gear system 200 includes planetary gears 210, a sun gear 220, a ring gear 230, and a planet carrier 240. The planetary gears 210 are arranged circumferentially around the sun gear 220, and the planetary gears 210 mesh with the sun gear 220 and the ring gear 230 respectively. The sun gear 220 and / or the ring gear 230 are used as power inputs, and the planet carrier 240 is used as a power output.
[0040] The rotor of the first motor 110 can be connected to the sun gear 220, and the rotor of the second motor 120 can be connected to the gear ring 230 through the gear ring overrunning clutch 500.
[0041] The foot pedal crankshaft 300 is connected to the sun gear 220 via the sun gear overrunning clutch 400, so that when torque is input from the foot pedal crankshaft 300, the sun gear overrunning clutch 400 drives the sun gear 220 to rotate synchronously, while when torque is input from the sun gear 220, the sun gear overrunning clutch 400 idles and the torque is not transmitted to the foot pedal crankshaft 300.
[0042] The gear ring overrunning clutch 500 is configured such that when the second motor 120 inputs torque, the gear ring overrunning clutch 500 drives the gear ring 230 to rotate synchronously, but when the torque is input from the gear ring 230, the gear ring overrunning clutch 500 idles and the torque is not transmitted to the second motor 120.
[0043] When the combined torque of the first motor 110 and the foot pedal crankshaft 300 at the sun gear 220 is greater than the torque output by the second motor 120 to the gear ring 230, the gear ring 230 is decelerated until it is locked by the gear ring overrunning clutch 500.
[0044] When the combined torque of the first motor 110 and the foot pedal crankshaft 300 at the sun gear 220 is less than or equal to the torque output by the second motor 120 to the gear ring 230, the speeds of the first motor 110 and the second motor 120 can be superimposed, and the speed ratio between the foot pedal crankshaft 300 and the planetary carrier 240 can achieve stepless speed change.
[0045] The dual-motor continuously variable transmission (CVT) electric drive system of this scheme includes a first motor 110, a second motor 120, a planetary gear system 200, a foot pedal crankshaft 300, a sun gear overrunning clutch 400, and a ring gear overrunning clutch 500. The foot pedal crankshaft 300 and the sun gear 220 of the planetary gear system 200 transmit motion and torque through the sun gear overrunning clutch 400; torque can only be transmitted from the foot pedal crankshaft 300 to the sun gear 220. The ring gear 230 is locked by the ring gear overrunning clutch 500, and can only rotate in one direction. The torque of the first motor 110 can be superimposed with the torque of the foot pedal crankshaft. Specifically, when the sum of the torques of the first motor 110 and the foot pedal crankshaft after torque amplification by the planetary gear system 200 is less than or equal to the torque of the second motor 120 after torque amplification by the planetary gear system 200, the speeds of the first motor 110 and the second motor 120 can be superimposed, and the speed ratio between the output shafts of the foot pedal crankshaft 300 can achieve continuously variable transmission. Such a dual-motor continuously variable transmission electric drive system can achieve stepless speed change, and such a system has the advantages of simple structure, easy use and convenient operation.
[0046] In an optional embodiment, the ring gear overrunning clutch 500 is disposed on the ring gear 230 or the rotor of the second motor 120. As can also be seen from Figure 1, in this embodiment, the ring gear overrunning clutch 500 is disposed on the ring gear 230.
[0047] In an optional embodiment, the sun gear overrunning clutch 400 and the planetary gear series 210 are both mounted on the foot pedal crankshaft 300. This further reduces the space occupied by the transmission system.
[0048] In an optional implementation, the first motor 110 and the second motor 120 are arranged symmetrically. This helps to ensure the stability of the dual-motor continuously variable transmission electric drive system during operation.
[0049] In an optional embodiment, it further includes a first motor input gear 710 and a second motor input gear 720; the rotor of the first motor 110 is connected to the first motor input gear 710, and the first motor input gear 710 can be connected to the sun gear 220; the rotor of the second motor 120 is connected to the second motor input gear 720; and the second motor input gear 720 can be connected to the gear ring 230.
[0050] In an optional embodiment, the dual-motor continuously variable transmission (CVT) electric drive system further includes a first motor idler gear 810 and a second motor idler gear 820; the first motor input gear 710 is connected to the sun gear 220 via the first motor idler gear 810; the second motor input gear 720 is connected to the gear ring 230 via the second motor idler gear 820. The first motor idler gear 810 and the second motor idler gear 820 are configured to change the direction of the output torque of the motor input gear, thereby ensuring the stability and reliability of the entire system.
[0051] As can also be seen from Figure 1, in this embodiment, the gear ring overrunning clutch 500 is arranged between the gear ring 230 and the second motor idler wheel 820. In other embodiments, the gear ring overrunning clutch 500 of the dual-motor continuously variable transmission electric drive system is not located between the gear ring 230 and the second motor idler wheel 820, but is directly located on the second motor idler wheel 820; this further simplifies the entire transmission system.
[0052] In an optional implementation, the first motor idler wheel 810 and the second motor idler wheel 820 can be arranged coaxially.
[0053] In an optional embodiment, referring to Figure 2, the dual-motor continuously variable transmission (CVT) system does not have a first motor idler gear 810 and a second motor idler gear 820. In this embodiment, the first motor input gear 710 directly meshes with the sun gear 220, and the second motor input gear 720 is connected to the ring gear 230 via a ring gear overrunning clutch 500. This further simplifies the transmission system.
[0054] In an optional embodiment, the planetary gear train 200, the pedal crankshaft 300, and the sun gear overrunning clutch 400 are kept coaxial. Optionally, the pedal crankshaft 300 passes through the center of the planet carrier 240. The planet carrier 240 is fitted onto the pedal crankshaft 300, and the planet carrier 240 is not directly connected to the pedal crankshaft 300.
[0055] It should be noted that the torque of the foot pedal crankshaft 300 in the dual-motor continuously variable transmission electric drive system can be superimposed with that of the first motor 110. The speed of the foot pedal crankshaft 300 is directly proportional to that of the first motor 110. During normal operation, the foot pedal crankshaft 300 can drive the rotor of the first motor 110 to rotate, but the first motor 110 cannot drive the foot pedal crankshaft 300 in the opposite direction.
[0056] The gear ring 230 can only rotate in the forward direction. When the driving torque of the second motor 120 is insufficient to counteract the sum of the torques of the first motor 110 and the foot pedal crankshaft 300, the gear ring overrunning clutch 500 locks the gear ring 230 to prevent it from reversing.
[0057] The first motor 110 is connected to the sun gear 220 of the planetary gear system 200 via gears, and the second motor 120 is connected to the ring gear 230 of the planetary gear system 200 via gears. After the first motor 110 and the second motor 120 are coupled through the gear set, stepless speed regulation between the foot pedal crank shaft 300 and the output shaft can be achieved. The output shaft (planet carrier 240) can transmit power in reverse to the first motor 110 and the second motor 120 to achieve the function of power generation.
[0058] It should be noted that in other embodiments of this disclosure, the first motor 110 and the second motor 120 may also be arranged asymmetrically; furthermore, the planetary gear system 200 and the foot pedal crankshaft 300 may also be arranged in a non-coaxial manner (specifically, the foot pedal crankshaft 300, planet carrier 240, and sun gear overrunning clutch 400 may not be arranged on the same axis), and the planetary gear system 200 may not be fitted onto the foot pedal crankshaft 300. This is just an example, and no specific limitation is made in other embodiments, as long as the dual-motor continuously variable transmission electric drive system can achieve stable speed change.
[0059] In summary, the embodiments of this disclosure provide a dual-motor continuously variable transmission electric drive system, which has at least the following advantages:
[0060] 1. To achieve stepless speed regulation between the foot pedal crankshaft 300 and the output shaft;
[0061] 2. The output shaft can achieve reverse drive capability and can be configured for energy recovery during deceleration, reducing braking load when descending long slopes, while generating electricity to replenish the battery and extend the driving range.
[0062] 3. The planetary gear system 200, which adopts an easy-to-manufacture NGW configuration, can significantly reduce manufacturing and processing difficulties, reduce assembly and installation difficulties, and achieve better cost advantages and better product quality.
[0063] 4. The application of the planetary gear system 200 allows for a more compact product design and lighter weight.
[0064] 5. The adoption of a 230 gear ring clutch reduces the requirements for the motor, allowing a larger torque output to be obtained even with a smaller torque drive motor.
[0065] 6. The first motor 110 can use a larger reduction ratio, and the second motor 120 can use a smaller reduction ratio. This can meet the vehicle's demand for high torque and high speed, while ensuring that the motor speed is not too high.
[0066] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims. Industrial applicability
[0067] The dual-motor continuously variable transmission electric drive system disclosed herein can achieve stepless speed change, and such a system has the advantages of simple structure, easy use and convenient operation.
Claims
1. A dual-motor continuously variable transmission electric drive system, characterized in that, include: First motor (110), second motor (120), planetary gear system (200), foot pedal crankshaft (300), sun gear overrunning clutch (400), ring gear overrunning clutch (500); The planetary gear system (200) includes planetary gears (210), a sun gear (220), a ring gear (230), and a planet carrier (240); the planetary gears (210) are circumferentially arranged around the sun gear (220), and the planetary gears (210) mesh with the sun gear (220) and the ring gear (230) respectively; and the sun gear (220) and / or the ring gear (230) are configured as power inputs, and the planet carrier (240) is configured as a power output; The rotor of the first motor (110) can be connected to the sun gear (220), and the rotor of the second motor (120) can be connected to the gear ring (230) through the gear ring overrunning clutch (500); The foot pedal crankshaft (300) is connected to the sun gear (220) via the sun gear overrunning clutch (400) so that when torque is input from the foot pedal crankshaft (300), the sun gear overrunning clutch (400) drives the sun gear (220) to rotate synchronously, while when torque is input from the sun gear (220), the sun gear overrunning clutch (400) idles and the torque is not transmitted to the foot pedal crankshaft (300); The gear ring overrunning clutch (500) is configured such that when the second motor (120) inputs torque, the gear ring overrunning clutch (500) drives the gear ring (230) to rotate synchronously, while when the torque is input from the gear ring (230), the gear ring overrunning clutch (500) idles and the torque is not transmitted to the second motor (120). When the combined torque of the first motor (110) and the foot pedal crankshaft (300) at the sun gear (220) is greater than the torque output by the second motor (120) to the gear ring (230), the gear ring (230) is decelerated until it is locked by the gear ring overrunning clutch (500); When the combined torque of the first motor (110) and the foot pedal crankshaft (300) at the sun gear (220) is less than or equal to the torque output by the second motor (120) to the gear ring (230), the speeds of the first motor (110) and the second motor (120) can be superimposed, and the speed ratio between the foot pedal crankshaft (300) and the planetary carrier (240) can be continuously variable.
2. The dual-motor continuously variable transmission electric drive system according to claim 1, characterized in that: The ring gear overrunning clutch (500) is arranged on the ring gear (230) or the rotor of the second motor (120).
3. The dual-motor continuously variable transmission electric drive system according to claim 1 or 2, characterized in that: It also includes a first motor input gear (710) and a second motor input gear (720); the rotor of the first motor (110) is connected to the first motor input gear (710), and the first motor input gear (710) can be connected to the sun gear (220); the rotor of the second motor (120) is connected to the second motor input gear (720); the second motor input gear (720) can be connected to the gear ring (230).
4. The dual-motor continuously variable transmission electric drive system according to claim 3, characterized in that: It also includes a first motor idler gear (810) and a second motor idler gear (820); the first motor input gear (710) is connected to the sun gear (220) through the first motor idler gear (810); the second motor input gear (720) can be connected to the gear ring (230) through the second motor idler gear (820).
5. The dual-motor continuously variable transmission electric drive system according to claim 4, characterized in that: The first motor idler wheel (810) and the second motor idler wheel (820) can be arranged coaxially.
6. The dual-motor continuously variable transmission electric drive system according to claim 4, characterized in that: The ring gear overrunning clutch (500) is arranged on the second motor idler wheel (820).
7. The dual-motor continuously variable transmission electric drive system according to claim 4, characterized in that: The ring gear overrunning clutch (500) is arranged between the ring gear (230) and the second motor idler wheel (820).
8. The dual-motor continuously variable transmission electric drive system according to any one of claims 1-7, characterized in that: The planetary gear system (200) and the foot pedal crankshaft (300) are coaxially arranged.
9. The dual-motor continuously variable transmission electric drive system according to any one of claims 1-8, characterized in that: The planetary gear (200), the foot pedal crankshaft (300), and the sun gear overrunning clutch (400) are kept coaxial.
10. The dual-motor continuously variable transmission electric drive system according to any one of claims 1-9, characterized in that: The foot pedal crankshaft (300) passes through the center of the planetary carrier (240).
11. The dual-motor continuously variable transmission electric drive system according to any one of claims 1-10, characterized in that: The sun gear overrunning clutch (400) and the planetary gears (210) are both mounted on the foot pedal crankshaft (300).
12. The dual-motor continuously variable transmission electric drive system according to any one of claims 1-11, characterized in that: The first motor (110) and the second motor (120) are arranged symmetrically.