Power-assisted derailleur and hybrid vehicle

Abstract

This utility model belongs to the field of transmissions, specifically disclosing a power-assisted transmission and a hybrid vehicle that facilitates human-powered riding. The power-assisted transmission includes an output gear, a drive mechanism for driving the output gear, a power-assist mechanism for assisting the drive mechanism, and a speed-assist mechanism for accelerating the drive mechanism. The drive mechanism includes a drive shaft, a drive sun gear, drive planet gears, a drive planet carrier, and a drive ring gear, with the drive sun gear, drive planet gears, and drive ring gear meshing sequentially. The drive mechanism also includes a drive gear for transmitting power to the power-assist mechanism or speed-assist mechanism, which in turn transmits power to the output gear. This utility model solves the problem that in existing continuously variable power transmissions (CVTs) in pure human-powered mode, the final wheel output speed may be lower than the frequency of human pedaling, making them unsuitable for human-powered riding.

Description

Technical Field

[0001] This utility model belongs to the field of transmissions, specifically relating to a power-assisted transmission that facilitates human-powered riding and a hybrid vehicle. Background Technology

[0002] Bicycles and tricycles are driven by human pedaling. To improve riding convenience, electric vehicles, including electric bicycles and electric tricycles, have emerged, achieving effortless and labor-saving riding through electric assistance. To achieve convenient and quick gear shifting, patent CN202422021056.7 discloses a continuously variable power transmission and a hybrid vehicle. By integrating the power assist mechanism, speed assist mechanism, and drive mechanism, the overall structure of the transmission is more compact, maximizing the performance advantages of power assist and speed assist. Furthermore, both the power assist mechanism and speed assist mechanism utilize a planetary gear system design, enabling stepless adjustment of power assist and speed assist, reducing the risk of poor riding experience caused by sudden changes in gear shifting.

[0003] Although the above technical solution achieves stepless adjustment through the planetary gear system during the assistance and acceleration processes, the use of the planetary gear system means that in pure human-powered mode, after the human pedaling drives the drive shaft to rotate, the power must also pass through the planetary gear system, which uses the ring gear as the driving component and the acceleration planetary carrier as the driven component, before it can be output. The power output of this planetary gear system will slow down, which may result in the final wheel output speed being lower than the human pedaling frequency. Therefore, although the above solution has a pure human-powered mode, it is not suitable for human-powered riding needs. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a power-assisted transmission and a hybrid vehicle that facilitate human-powered riding. This solves the problem that in pure human-powered mode, the final wheel output speed of the continuously variable power-assisted transmission may be lower than the frequency of human pedaling, making it unsuitable for human-powered riding.

[0005] According to the embodiments of this utility model, the following technical solution is adopted:

[0006] A power-assisted transmission for easy human-powered riding includes an output gear, a drive mechanism for driving the output gear, a power-assist mechanism for assisting the drive mechanism, and a speed-assist mechanism for accelerating the drive mechanism. The drive mechanism includes a drive shaft, a drive sun gear, drive planet gears, a drive planet carrier, and a drive ring gear. The drive shaft is rotatably mounted, the drive sun gear is rotatably mounted on the drive shaft, the drive planet carrier is mounted on the drive shaft, the drive ring gear is fixedly mounted, and the drive planet gears are rotatably connected to the drive planet carrier. The drive sun gear, drive planet gears, and drive ring gear mesh sequentially for transmission. The drive sun gear transmits power to the power-assist mechanism or speed-assist mechanism, which in turn transmits power to the output gear.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] Let the rotational speed of the drive shaft be A1. In the existing continuously variable power transmission, when the drive shaft directly transmits power to the power assist mechanism or speed assist mechanism, the output speed becomes B1 after passing through the power assist mechanism or speed assist mechanism.

[0009] In this scheme, the rotational speed of the drive shaft is A1. The drive shaft drives the drive planetary carrier to rotate, forming a planetary gear system with the drive planetary carrier as the driving component, the drive ring gear as the fixed component, and the drive sun gear as the driven component. The output speed of the drive sun gear increases by A2. When the power is transmitted to the power assist mechanism or speed assist mechanism at the increased speed of A2, the final output speed B2 after passing through the power assist mechanism or speed assist mechanism will inevitably be greater than B1.

[0010] In the actual design process, by designing the speed increase ratio of the drive mechanism, in pure human-powered mode, as long as the speed increase ratio of the drive mechanism is greater than the speed reduction ratio of the assist mechanism or speed-boosting mechanism, the output speed can be higher than the frequency of human pedaling. Compared with the continuously variable speed assist transmission of the existing technology, this solution is more suitable for human-powered riding in pure human-powered mode. While meeting the compliant assistance and speed-boosting requirements, it organically combines the needs of pure human-powered riding with the needs of assistance and speed-boosting, thereby improving the speed requirements of pure human-powered riding.

[0011] Furthermore, the drive mechanism also includes a drive gear coaxially connected to the drive sun gear, and the outer diameter of the drive gear is larger than the outer diameter of the drive sun gear.

[0012] Furthermore, the planetary carrier is unidirectionally connected to the drive shaft, or the drive gear and the sun gear are unidirectionally connected.

[0013] Furthermore, the power assist mechanism includes a power assist shaft, a power assist sun gear, power assist planetary gears, a power assist planetary carrier, and a power assist ring gear. The power assist shaft is rotatably mounted, the power assist sun gear is mounted on the power assist shaft, the power assist planetary carrier is fixedly mounted, and the power assist planetary gears are rotatably connected to the power assist planetary carrier. The power assist sun gear, power assist planetary gears, and power assist ring gear mesh and drive in sequence; the drive gear meshes and drives the power assist ring gear.

[0014] Furthermore, the speed-boosting mechanism includes a speed-boosting shaft, a speed-boosting sun gear, speed-boosting planetary gears, a speed-boosting planetary carrier, and a speed-boosting ring gear. The speed-boosting shaft is unidirectionally rotatable, the speed-boosting sun gear is mounted on the speed-boosting shaft, the speed-boosting planetary carrier is rotatable, and the speed-boosting planetary gears are rotatably connected to the speed-boosting planetary carrier. The speed-boosting sun gear, speed-boosting planetary gears, and speed-boosting ring gear mesh sequentially for transmission; the drive gear meshes with the speed-boosting ring gear for transmission.

[0015] Furthermore, the gear ring and speed-boosting gear ring are fixedly connected or integrally molded.

[0016] Furthermore, a planetary carrier gear is installed on the speed-boosting planetary carrier, and the planetary carrier gear meshes with the output gear for transmission.

[0017] Furthermore, the output gear is rotatably connected to the drive shaft, and the output gear is coaxially connected to the output sprocket.

[0018] Furthermore, the drive mechanism also includes a drive component for rotating the drive shaft, the drive component including pedals mounted at both ends of the drive shaft.

[0019] According to embodiments of this utility model, the following technical solutions are also adopted:

[0020] Hybrid vehicles, including power-assisted transmissions that facilitate human riding. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0022] Figure 2 This is a schematic diagram of the drive mechanism in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the assist mechanism and acceleration mechanism in the embodiments of this utility model.

[0024] In the diagram: 1. Pedal; 2. Output sprocket; 3. Drive shaft; 4. Output gear; 5. Drive gear; 6. Drive planetary carrier; 7. Drive one-way bearing; 8. Drive ring gear; 9. Drive planetary gears; 10. Drive sun gear; 11. Main ring gear; 12. Auxiliary shaft; 13. Auxiliary sun gear; 14. Auxiliary planetary gears; 15. Auxiliary planetary carrier; 16. Speed-boosting shaft; 17. Speed-boosting sun gear; 18. Speed-boosting planetary gears; 19. Planetary carrier gear; 20. Speed-boosting planetary carrier; 21. Speed-boosting one-way bearing. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings, and specific embodiments will be given.

[0026] In a first aspect, embodiments of this utility model disclose a power-assisted transmission that facilitates human-powered riding, specifically including the following embodiments:

[0027] like Figure 1 , Figure 2 , Figure 3 As shown, the power-assisted transmission for easy human-powered riding includes a housing. Inside the housing are an output gear 4, a drive mechanism for driving the output gear 4, an assist mechanism for assisting the drive mechanism, and a speed-boosting mechanism for accelerating the drive mechanism. In this embodiment, the drive mechanism is driven manually, the assist mechanism is electrically assisted, and the speed-boosting mechanism is also electrically assisted. Of course, in actual design, the assist mechanism can also be manually assisted, but if both the assist mechanism and the drive mechanism are manually assisted, then two people are required to operate it, and it cannot be operated by a single person.

[0028] The drive mechanism includes a drive shaft 3, a drive sun gear 10, a drive planetary gear 9, a drive planetary carrier 6, and a drive ring gear 8. The drive shaft 3 is rotatably connected to the housing. The drive mechanism is manually driven. Specifically, the drive mechanism also includes a drive component for rotating the drive shaft 3. Both ends of the drive shaft 3 extend out of the housing. The drive component includes pedals 1 installed at both ends of the drive shaft 3. The drive shaft 3 is rotated by manually stepping on the pedals 1. The design of the pedals 1 can refer to the design of bicycle pedals in the prior art.

[0029] The sun gear 10 is rotatably mounted on the drive shaft 3. Specifically, a bearing is installed between the sun gear 10 and the drive shaft 3, allowing both the sun gear 10 and the drive shaft 3 to rotate independently without affecting each other. In this embodiment, the planetary carrier 6 is unidirectionally rotatably mounted on the drive shaft 3. Specifically, the planetary carrier 6 includes a mounting ring connected to the drive shaft 3 and multiple supports arranged circumferentially along the mounting ring. A one-way bearing 7 is installed between the mounting ring and the drive shaft 3. The planetary gears 9 are rotatably connected to the supports of the planetary carrier 6, and the ring gear 8 is fixedly mounted inside the housing. The sun gear 10, planetary gears 9, and ring gear 8 mesh sequentially for transmission.

[0030] The drive sun gear 10 is used to transmit power to the power assist mechanism or speed assist mechanism, which in turn transmits power to the output gear 4. Specifically, in this embodiment, the drive sun gear 10 is coaxially fixedly connected to a drive gear 5. The outer diameter of the drive gear 5 is larger than that of the drive sun gear 10. Since the drive sun gear 10 is designed to be located inside the drive planet carrier 6 according to the structure of the planetary gear system, its size should not be too large in order to ensure a compact structure. To ensure the speed of power transmission, the size of the drive gear 5, which is coaxially fixed to the drive sun gear 10, is designed to ensure both the output speed of the drive gear 5 (which is consistent with the rotational speed of the drive sun gear 10) and the transmission ratio when the drive gear 5 and the power assist mechanism or speed assist mechanism are in motion.

[0031] The power-assist mechanism includes a power-assist shaft 12, a power-assist sun gear 13, power-assist planetary gears 14, a power-assist planetary carrier 15, and a power-assist ring gear. The power-assist shaft 12 is rotatably mounted inside the housing, and the power-assist sun gear 13 is fixedly mounted on the power-assist shaft 12, allowing the power-assist sun gear 13 and the power-assist shaft 12 to rotate synchronously. The power-assist planetary carrier 15 is fixedly mounted inside the housing, and the power-assist planetary gears 14 are rotatably connected to the power-assist planetary carrier 15. The power-assist sun gear 13, the power-assist planetary gears 14, and the power-assist ring gear mesh sequentially for transmission. The power-assist ring gear and the drive gear 5 also mesh for transmission. Specifically, the power-assist ring gear is a ring gear with teeth on both the inner and outer sides, or an inner ring gear is used, and then an outer ring gear is fixed to the outer side or end of the inner ring gear.

[0032] In this embodiment, the assist mechanism is electrically assisted, so an assist motor is installed in the housing. The output shaft of the assist motor and the assist shaft 12 are fixed. The assist motor drives the assist shaft 12 to rotate. In actual design, the assist shaft 12 can also be omitted and the output shaft of the assist motor can be used directly to replace the assist shaft 12. That is, the assist sun gear 13 is directly installed on the output shaft of the assist motor.

[0033] The speed-boosting mechanism includes a speed-boosting shaft 16, a speed-boosting sun gear 17, speed-boosting planetary gears 18, a speed-boosting planetary carrier 20, and a speed-boosting ring gear. The speed-boosting shaft 16 is unidirectionally rotatable. Specifically, a one-way bearing 21 is installed between the speed-boosting shaft 16 and the housing. The speed-boosting sun gear 17 is fixedly mounted on the speed-boosting shaft 16. The speed-boosting planetary carrier 20 is rotatably mounted inside the housing. The speed-boosting planetary gears 18 are rotatably connected to the speed-boosting planetary carrier 20. The speed-boosting sun gear 17, speed-boosting planetary gears 18, and speed-boosting ring gear mesh sequentially for transmission. The speed-boosting ring gear and the drive gear 5 also mesh for transmission. Specifically, the speed-boosting ring gear is a ring gear with teeth on both the inner and outer sides, or an inner ring gear is used, and then an outer ring gear is fixed to the outer side or end of the inner ring gear.

[0034] In this embodiment, the speed-boosting mechanism adopts electric speed boosting. A speed-boosting motor is installed inside the housing. The output shaft of the speed-boosting motor and the speed-boosting shaft 16 are fixed. The speed-boosting motor drives the speed-boosting shaft 16 to rotate. In actual design, the speed-boosting shaft 16 can also be omitted. The output shaft of the speed-boosting motor can be used directly to replace the speed-boosting shaft 16. That is, the speed-boosting sun gear 17 is directly installed on the output shaft of the speed-boosting motor.

[0035] In this embodiment, both the speed-boosting planetary gear 18 and the power-assisting planetary gear 14 are conventional gear structures. The power-assisting gear ring and the speed-assisting gear ring are fixedly connected or integrally formed. In actual design, taking the integral forming of the power-assisting gear ring and the speed-assisting gear ring as an example, the power-assisting gear ring and the speed-assisting gear ring can be regarded as a whole gear ring structure (hereinafter referred to as the total gear ring 11). Then, only a larger width of the total gear ring 11 needs to be designed, and the total gear ring 11 meshes with both the power-assisting planetary gear 14 and the speed-assisting planetary gear 18. This ensures that the power-assisting mechanism and the speed-assisting mechanism are distributed on both sides of the total gear ring 11 along the axial direction, making the overall structure more compact and facilitating the power transmission between the total gear ring 11 and the drive gear 5.

[0036] Planetary carrier 20 is equipped with planetary carrier gear 19, which meshes with output gear 4 for transmission. Output gear 4 is rotatably connected to drive shaft 3. The rotation of drive shaft 3 does not directly drive output gear 4 to rotate. Output sprocket 2 is coaxially fixed to output gear 4. Output gear 4 is driven to rotate by planetary carrier gear 19, and output sprocket 2 rotates synchronously. Output sprocket 2 transmits power to achieve vehicle movement.

[0037] In another embodiment of this utility model, both the assist planetary gear 14 and the speed-boosting planetary gear 18 are double gears. Specifically, referring to the design in patent CN202422021056.7, both the assist planetary gear 14 and the speed-boosting planetary gear 18 include a first gear and a second gear, with the outer diameter of the first gear being smaller than that of the second gear. The first gear of the assist planetary gear 14 meshes with the assist ring gear, and the second gear of the assist planetary gear 14 meshes with the assist sun gear 13; the first gear of the speed-boosting planetary gear 18 meshes with the speed-boosting ring gear, and the second gear of the speed-boosting planetary gear 18 meshes with the speed-boosting sun gear 17. In this embodiment, both the assist planetary gear 14 and the speed-boosting planetary gear 18 are double gears, meaning that the planetary gear systems of both the assist mechanism and the speed-boosting mechanism are NW-type planetary gear systems. Compared to NGW-type planetary gear systems, the transmission ratio range is larger, meaning the adjustable range of assist and speed is greater. However, an increased transmission ratio range can also affect the output speed in pure manual mode to some extent, therefore, the design needs to be selected according to actual requirements.

[0038] The power-assisted transmission in the above embodiment, which facilitates human-powered riding, has four operating modes. Taking the rotation direction of the main gear ring 11 as a reference, assuming that the rotation direction of the main gear ring 11 is always forward to drive the vehicle forward, then all gears rotating in the same direction as the main gear ring 11 are forward rotations, and those rotating in the opposite direction are reverse rotations. In the following description, the rotation direction of each gear is described as forward or reverse rotation, but forward and reverse do not refer to specific directions. Based on this forward and reverse limitation, in this embodiment, the function of the aforementioned drive one-way bearing 7 is: when the drive shaft 3 rotates in reverse, it can drive the drive planetary carrier 6 to rotate together; when the drive shaft 3 rotates in the forward direction, it cannot drive the drive planetary carrier 6 to rotate. Correspondingly, the drive planetary carrier 6 can also rotate in the reverse direction relative to the drive shaft 3, but the drive planetary carrier 6 cannot rotate in the forward direction relative to the drive shaft 3. The function of the aforementioned speed-assisting one-way bearing 21 is: the speed-assisting shaft 16 can rotate in the forward direction relative to the housing, but cannot rotate in the reverse direction relative to the housing.

[0039] The specific working mode is as follows:

[0040] A. Purely manual mode:

[0041] In this mode, drive shaft 3 is the driving element; that is, when a person steps on pedal 1, drive shaft 3 rotates, causing it to rotate in the opposite direction. Drive sun gear 10, drive planet gears 9, and drive ring gear 8 mesh sequentially to form a planetary gear train. Drive sun gear 10 is rotatably connected to drive shaft 3 but does not rotate synchronously with it. Drive planet carrier 6 rotates with drive shaft 3. Therefore, in this planetary gear train, drive planet carrier 6 is the driving element, and drive sun gear 10 is the driven element. Drive sun gear 10 also rotates in the opposite direction, synchronously driving drive gear 5 to rotate in the opposite direction, thus achieving speed increase.

[0042] When the main gear ring 11 and the drive gear 5 mesh, the main gear ring 11 rotates in the forward direction. At this time, the main gear ring 11, the speed-boosting planetary gear 18, and the speed-boosting sun gear 17 mesh sequentially to form a planetary gear train. The speed-boosting motor does not start, and the speed-boosting shaft 16 is locked by the speed-boosting one-way bearing 21. Correspondingly, the speed-boosting sun gear 17 does not move. In this planetary gear train, the main gear ring 11 acts as the driving member, and the speed-boosting planetary carrier 20 acts as the driven member. The speed-boosting planetary carrier 20 rotates in the forward direction, which in turn drives the output gear 4 to rotate in the reverse direction, thereby realizing power output.

[0043] In the above process, the main gear ring 11, the auxiliary planetary gear 14, and the auxiliary sun gear 13 also mesh and drive in sequence to form a planetary gear system. The auxiliary motor is not started, and the auxiliary planetary carrier 15 is fixed. In this planetary gear system, the main gear ring 11 is the driving member and the auxiliary sun gear 13 is the driven member. The auxiliary sun gear 13 rotates in the opposite direction. Since the auxiliary motor is not started at this time, the output shaft of the auxiliary motor can rotate freely with the rotation of the auxiliary shaft 12.

[0044] B. Pure Electric Mode:

[0045] In this mode, the assist shaft 12 is the driving member, that is, the assist motor drives the assist shaft 12 to rotate, so that the rotation direction of the assist shaft 12 is reversed. The assist sun gear 13 rotates in the opposite direction. The assist sun gear 13, the assist planet gear 14, and the total gear ring 11 mesh and transmit power in sequence to form a planetary gear system. In this planetary gear system, the assist sun gear 13 is the driving member and the total gear ring 11 is the driven member, driving the total gear ring 11 to rotate in the forward direction.

[0046] At this time, the main ring gear 11, the speed-boosting planetary gear 18, and the speed-boosting sun gear 17 mesh sequentially to form a planetary gear train. It is possible to choose whether to synchronously start the speed-boosting motor, i.e., whether to use the synchronous speed-boosting mode. When the speed-boosting motor is not running, the speed-boosting shaft 16 is locked by the speed-boosting one-way bearing 21, and the corresponding speed-boosting sun gear 17 does not move. In this planetary gear train, the main ring gear 11 acts as the driving member, and the speed-boosting planetary carrier 20 acts as the driven member. The speed-boosting planetary carrier 20 rotates forward, which in turn drives the output gear 4 to rotate in the opposite direction, achieving power output. When the speed-boosting motor starts, it drives the speed-boosting sun gear 17 to rotate forward. The speeds of the speed-boosting sun gear 17 and the main ring gear 11 are superimposed on the speed-boosting planetary carrier 20, increasing the speed of the speed-boosting planetary carrier 20, which in turn increases the speed of the output gear 4.

[0047] In the above process, the rotation of the main gear ring 11 drives the drive gear 5 to rotate in the opposite direction, and the drive gear 5 drives the drive sun gear 10 to rotate in the opposite direction. The drive sun gear 10, drive planet gear 9, and drive gear ring 8 mesh and transmit power in sequence to form a planetary gear system. In this planetary gear system, the drive sun gear 10 is the driving member and the drive planet carrier 6 is the driven member. When the drive planet carrier 6 rotates in the opposite direction, the drive planet carrier 6 is restricted by the drive one-way bearing 7 and rotates freely on the drive shaft 3, while the drive shaft 3 does not move, so as to avoid the pedal 1 moving and affecting the riding experience.

[0048] Depending on the actual layout requirements, the drive planetary carrier 6 can also be fixedly installed on the drive shaft 3, and the drive sun gear 10 and drive gear 5 can be designed to rotate in one direction. Even if the one-way bearing is installed between the drive sun gear 10 and the drive gear 5, the drive gear 5 will rotate freely on the drive shaft 3 without driving the drive sun gear 10 to rotate.

[0049] C. Assistance Mode:

[0050] In this mode (also known as hybrid mode), both drive shaft 3 and assist shaft 12 rotate as active components. That is, while the pedal 1 is manually pressed, driving drive shaft 3 to rotate, the assist motor is activated, driving assist shaft 12 to rotate. This causes drive shaft 3 and assist shaft 12 to rotate in opposite directions. Referring to the motion process in pure manual mode and pure electric mode, the power of both drive shaft 3 and assist shaft 12 is transmitted to the main gear ring 11, causing the main gear ring 11 to rotate in the forward direction. The torque transmitted to the main gear ring 11 is superimposed to achieve electric assist, thereby reducing the force required to manually press pedal 1.

[0051] D. Boost Mode:

[0052] In this mode, either the drive shaft 3 or the assist shaft 12 can be used as the driving component to rotate, or both can be used as the driving component to rotate. In actual use, in pure manual mode, speed assistance is generally not required. However, in pure electric mode or assist mode, when the assist shaft 12 is used as the driving component to rotate, the speed assistance mode can be selectively used simultaneously.

[0053] In this embodiment, taking both drive shaft 3 and assist shaft 12 as active components (i.e., assist mode) as an example, when the human pedal 1 drives drive shaft 3 to rotate, the assist motor is started to drive assist shaft 12 to rotate, and the speed motor is also started to drive speed shaft 16 to rotate, so that drive shaft 3 and assist shaft 12 rotate in opposite directions, and speed shaft 16 rotates in the forward direction.

[0054] Referring to the motion processes in both pure manual and pure electric modes, the power from both the drive shaft 3 and the assist shaft 12 is transmitted to the main gear ring 11, causing it to rotate forward. The main gear ring 11, the assist planetary gear 18, and the assist sun gear 17 mesh sequentially, forming a planetary gear system that enables the assist planetary carrier 20 to rotate forward, thereby achieving power output. During this process, the assist sun gear 17 also rotates forward synchronously. The speeds of the assist sun gear 17 and the main gear ring 11 are superimposed on the speed of the assist planetary carrier 20, increasing its speed and thus increasing the speed of the output gear 4. By adjusting the speed of the assist shaft 16, the speed of the output gear 4 can be infinitely adjusted.

[0055] Secondly, embodiments of this utility model disclose a hybrid vehicle, including the aforementioned power-assisted transmission for easy human riding. The hybrid vehicle referred to in this embodiment can be a bicycle, tricycle, or similar vehicle, as long as it can utilize the aforementioned power-assisted transmission for easy human riding to achieve power output.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A power-assisted derailleur for facilitating human-powered pedalling, characterised in that: It includes an output gear, a drive mechanism for driving the output gear to rotate, an assist mechanism for assisting the drive mechanism, and a speed-boosting mechanism for assisting the drive mechanism to accelerate. The drive mechanism includes a drive shaft, a drive sun gear, drive planet gears, a drive planet carrier, and a drive ring gear. The drive shaft is rotatably mounted, the drive sun gear is rotatably mounted on the drive shaft, the drive planet carrier is mounted on the drive shaft, the drive ring gear is fixedly mounted, and the drive planet gears are rotatably connected to the drive planet carrier. The drive sun gear, drive planet gears, and drive ring gear mesh and transmit power in sequence. The drive sun gear is used to transmit power to the power assist mechanism or speed assist mechanism, which in turn transmits power to the output gear.

2. The assistive variable speed drive for human-powered pedaling according to claim 1, wherein: The drive mechanism also includes a drive gear coaxially connected to the drive sun gear, and the outer diameter of the drive gear is larger than the outer diameter of the drive sun gear.

3. The power-assisted transmission for easy human-powered riding according to claim 2, characterized in that: The driving planetary carrier is unidirectionally rotatably connected to the driving shaft, or the driving gear and the driving sun gear are unidirectionally rotatably connected.

4. The power-assisted transmission for easy human-powered riding according to claim 2, characterized in that: The power assist mechanism includes a power assist shaft, a power assist sun gear, power assist planetary gears, a power assist planetary carrier, and a power assist ring gear. The power assist shaft is rotatably mounted, the power assist sun gear is mounted on the power assist shaft, the power assist planetary carrier is fixedly mounted, and the power assist planetary gears are rotatably connected to the power assist planetary carrier. The power assist sun gear, power assist planetary gears, and power assist ring gear mesh and drive in sequence; the drive gear meshes and drives the power assist ring gear.

5. The power-assisted transmission for easy human-powered riding according to claim 4, characterized in that: The speed-boosting mechanism includes a speed-boosting shaft, a speed-boosting sun gear, speed-boosting planetary gears, a speed-boosting planetary carrier, and a speed-boosting ring gear. The speed-boosting shaft is unidirectionally rotatable, the speed-boosting sun gear is mounted on the speed-boosting shaft, the speed-boosting planetary carrier is rotatably mounted, and the speed-boosting planetary gears are rotatably connected to the speed-boosting planetary carrier. The speed-boosting sun gear, speed-boosting planetary gears, and speed-boosting ring gear mesh sequentially for transmission; the drive gear meshes with the speed-boosting ring gear for transmission.

6. The power-assisted transmission for easy human-powered riding according to claim 5, characterized in that: The booster gear ring and the speed booster gear ring are fixedly connected or integrally formed.

7. The power-assisted transmission for easy human-powered riding according to claim 5, characterized in that: The planetary carrier is equipped with a planetary carrier gear, which meshes with the output gear for transmission.

8. The power-assisted transmission for easy human-powered riding according to any one of claims 1-7, characterized in that: The output gear is rotatably connected to the drive shaft, and the output gear is coaxially connected to the output sprocket.

9. The power-assisted transmission for easy human-powered riding according to any one of claims 1-7, characterized in that: The drive mechanism further includes a drive component for rotating the drive shaft, the drive component including pedals mounted at both ends of the drive shaft.

10. A hybrid vehicle, characterized in that: Includes the power-assisted transmission for easy human-powered riding as described in any one of claims 1-9.

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