Dual-motor driving system and electric power-assisted carrier

Abstract

The utility model relates to the technical field of electric driving, in particular to a dual-motor driving system and an electric power-assisted carrier. The dual-motor driving system comprises a middle shaft, a first transmission wheel, a planetary gear set, a first motor, a second motor, a second transmission wheel and a third transmission wheel; the planetary gear set comprises a sun gear, a planetary gear mechanism and a gear ring, and the planetary gear mechanism is meshed with inner teeth of the sun gear and the gear ring; the planet wheel mechanism is arranged on the planet shaft in a sleeving mode, and the planet shaft is fixedly arranged on the second transmission wheel so that the second transmission wheel can form a planet carrier. The first transmission wheel is fixedly arranged on the middle shaft and is in transmission connection with the gear ring; a first motor shaft of the first motor is in transmission connection with the gear ring; a second motor shaft of the second motor is connected with the sun gear to drive the sun gear to rotate; the second transmission wheel is in transmission connection with the third transmission wheel so as to output power to wheels. In this way, stepless speed change adjustment can be achieved more simply and efficiently.

Description

Technical Field

[0001] The utility model relates to the field of electric drive technology, and in particular to a dual-motor drive system and an electric power-assisted vehicle. Background Art

[0002] Electric bicycles, also known as hybrid bicycles or ebikes, have become increasingly popular in recent years due to their combination of cycling's leisure and effortless features. Currently, most electric bicycles on the market use a separate electric drive system consisting of a motor and a transmission mechanism.

[0003] Most existing electric-assisted bicycles feature a single motor for power steering, with speed adjustment achieved through the bicycle's transmission system. This system typically uses traditional gear shifting technology to achieve step-by-step speed adjustment. However, this method is complex and inconvenient to assemble and maintain. Utility Model Content

[0004] The purpose of the present invention includes, for example, providing a dual-motor drive system and an electric-assisted vehicle, which can achieve stepless speed adjustment more simply and efficiently.

[0005] The embodiment of the present utility model can be implemented as follows:

[0006] In a first aspect, the present invention provides a dual-motor drive system, comprising:

[0007] a central shaft, a first transmission wheel, a planetary gear set, a first motor, a second motor, a second transmission wheel, and a third transmission wheel;

[0008] The planetary gear set includes a sun gear, a planetary gear mechanism, and a ring gear, wherein the planetary gear mechanism meshes with the internal teeth of the sun gear and the ring gear respectively; the planetary gear mechanism is sleeved on a planetary shaft, and the planetary shaft is fixed to the second transmission wheel, so that the second transmission wheel constitutes a planet carrier;

[0009] The first transmission wheel is fixed on the central shaft, and the first transmission wheel is in transmission connection with the ring gear;

[0010] The first motor shaft of the first motor is connected to the ring gear; the second motor shaft of the second motor is connected to the sun gear to drive the sun gear to rotate; the second transmission wheel is connected to the third transmission wheel to output power to the wheels.

[0011] In an optional embodiment, the axis center line of the central shaft and the axis center line of the second motor shaft are parallel to each other; and there is an angle between the axis center line of the second motor shaft and the axis center line of the first motor shaft.

[0012] In an optional embodiment, it further includes a first mating wheel and a second mating wheel; the second mating wheel is arranged on the outer wall of the gear ring, and the first mating wheel is arranged on the end of the first motor shaft;

[0013] The first mating wheel and the second mating wheel are mated with each other using bevel gears.

[0014] In an optional embodiment, a speed change mechanism is further included; the first motor shaft is connected to the first mating wheel through the speed change mechanism to adjust the torque and speed output by the first motor to the first mating wheel.

[0015] In an optional embodiment, the third transmission wheel is further provided with an output wheel, and the output wheel can be connected to the wheel in a driving manner.

[0016] In an optional embodiment, the output wheel is configured to output power to the wheel via gears, belts or chains.

[0017] In an optional embodiment, the planetary gear set is an NW or NGW type gear train.

[0018] In an optional embodiment, the planetary gear mechanism includes a first wheel and a second wheel;

[0019] The first wheel is sleeved on the planetary shaft, and the second wheel is fixed to the outside of the first wheel;

[0020] The first gear meshes with the inner teeth of the ring gear, and the second gear meshes with the sun gear.

[0021] In an optional embodiment, the second transmission wheel is configured to be connectable to the third transmission wheel via gear transmission, belt transmission or chain transmission;

[0022] And / or, the first transmission wheel is configured to be connectable to the ring gear via gear transmission, belt transmission or chain transmission.

[0023] In a second aspect, the present invention provides an electric-powered vehicle, which includes the dual-motor drive system described in any one of the aforementioned embodiments.

[0024] The beneficial effects of the embodiments of the present invention include, for example:

[0025] The dual-motor drive system of this solution includes a central shaft, a first transmission wheel, a planetary gear set, a first motor, a second motor, a second transmission wheel, and a third transmission wheel. The pedaling drive force can drive the central shaft to rotate, and the first transmission wheel is used to transmit the pedaling drive force to the ring gear; the first motor can drive the ring gear to rotate, so that the rider's pedaling torque and the power of the first motor are combined for the first time at the ring gear, thereby achieving the effect of power and torque superposition and speed matching. Furthermore, because the second motor is connected to the sun gear, it drives the sun gear and the planetary gear mechanism to the second transmission wheel in turn, so that the power of the first power combination at the ring gear and the power of the second motor are combined for the second time at the second transmission wheel, and are transmitted to the third transmission wheel, and then output power to the wheels. In summary, the entire dual-motor drive system has two power combinations, realizing the innovative function of both power and speed assistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic structural diagram of a dual-motor drive system according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of a dual-motor drive system according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic structural diagram of a dual-motor drive system according to another embodiment of the present invention;

[0030] Figure 4 This is a structural principle diagram of a dual-motor drive system according to another embodiment of the present invention.

[0031] Icons: 11-middle shaft; 100-first transmission wheel; 200-second transmission wheel; 300-third transmission wheel; 333-output wheel; 410-first motor; 411-first motor shaft; 420-second motor; 422-second motor shaft; 500-planetary gear set; 510-sun gear; 520-planetary gear mechanism; 521-first wheel; 522-second wheel; 530-ring gear; 540-planetary shaft; 610-first mating wheel; 620-second mating wheel; 700-speed transmission mechanism. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0036] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0037] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0038] Please refer to Figure 1 and Figure 2 This embodiment provides a dual-motor drive system, including a central shaft 11, a first transmission wheel 100, a planetary gear set 500, a first motor 410, a second motor 420, a second transmission wheel 200 and a third transmission wheel 300.

[0039] The planetary gear set 500 includes a sun gear 510, a planetary gear mechanism 520, and a ring gear 530. The planetary gear mechanism 520 meshes with the internal teeth of the sun gear 510 and the ring gear 530, respectively. The planetary gear mechanism 520 is sleeved on a planetary shaft 540, which is fixed to the second transmission gear 200, so that the second transmission gear 200 forms a planetary carrier.

[0040] The first transmission wheel 100 is fixed on the central shaft 11 and is in transmission connection with the ring gear 530;

[0041] The first motor shaft 411 of the first motor 410 is in transmission connection with the ring gear 530; the second motor shaft 422 of the second motor 420 is connected to the sun gear 510 to drive the sun gear 510 to rotate; the second transmission wheel 200 is in transmission connection with the third transmission wheel 300 to output power to the wheels.

[0042] The crank pedals can be connected to both ends of the length of the middle shaft 11, and the middle shaft 11 can be driven by pedaling. The pedaling drive force can drive the middle shaft 11 to rotate. The first transmission wheel 100 is used to transmit the pedaling drive force to the ring gear 530; the first motor 410 can drive the ring gear 530 to rotate. In this way, the rider's pedaling torque and the power of the first motor 410 are combined at the ring gear 530 for the first time, thereby achieving the effect of superimposing power and torque and matching the speed. Furthermore, because the second motor 420 is connected to the sun gear 510, it drives the sun gear 510, the planetary gear mechanism 520, and the second transmission wheel 200 to rotate in sequence. This allows the power of the first power combination at the ring gear 530 to achieve a second power combination at the second transmission wheel 200 with the power of the second motor 420, and transmits it to the third transmission wheel 300, thereby outputting power to the wheels. In summary, the entire dual-motor drive system has two power combinations, realizing the innovative function of both power and speed assistance.

[0043] Please continue reading Figure 1 、 Figure 2 , to learn more structural details of the dual-motor drive system.

[0044] As can be seen from the figure, the axis of the central axle 11 and the axis of the second motor shaft 422 are parallel to each other; there is an angle between the axis of the second motor shaft 422 and the axis of the first motor shaft 411. This allows the first motor 410 and the second motor 420 to be arranged at an angle as needed, effectively reducing the overall thickness of the electric drive system, facilitating its placement on the bicycle, and allowing the first motor 410 to be concealed within the bicycle frame.

[0045] In this embodiment of the present invention, the dual-motor drive system further includes a first mating wheel 610 and a second mating wheel 620. The second mating wheel 620 is mounted on the outer wall of the ring gear 530, while the first mating wheel 610 is mounted on the end of the first motor shaft 411. The first mating wheel 610 and the second mating wheel 620 utilize bevel gears. Specifically, the second mating wheel 620 is fixed to the outer wall of the ring gear 530. Both the first mating wheel 610 and the second mating wheel 620 are bevel gears, ensuring that the first motor shaft 411 and the second motor shaft 422 are perpendicular to each other.

[0046] Optionally, the planetary gear set 500 may be a NW type or NGW type gear train. It is easy to understand that by adjusting the configuration of the planetary gear set 500 to meet different power output effects, this is just an example and is not limiting.

[0047] Optionally, the dual-motor drive system further includes a speed change mechanism 700; the first motor shaft 411 is connected to the first mating wheel 610 via the speed change mechanism 700 to adjust the torque and speed output by the first motor 410 to the first mating wheel 610. This can further adjust the output torque after merging.

[0048] It should be noted that the speed change mechanism 700 may also be integrated into the first motor 410 , thereby further reducing the volume of the first motor 410 and improving the space utilization within the vehicle frame.

[0049] In this embodiment of the present invention, the third transmission wheel 300 is further provided with an output wheel 333, which is capable of being transmission-connected to the wheel. Optionally, the output wheel 333 is configured to output power to the wheel via a gear, belt, or chain. For example, the output wheel 333 can be a chainring, pulley, or the like.

[0050] Optionally, the second transmission wheel 200 is configured to be connected to the third transmission wheel 300 via a gear transmission, a belt transmission, or a chain transmission; and / or the first transmission wheel 100 is configured to be connected to the ring gear 530 via a gear transmission, a belt transmission, or a chain transmission. Specifically, in this embodiment, the external teeth of the second transmission wheel 200 mesh with the external teeth of the second transmission wheel 200; and the external teeth of the first transmission wheel 100 mesh with the external teeth of the ring gear 530.

[0051] Optionally, the planetary gear mechanism 520 includes a first wheel 521 and a second wheel 522; the first wheel 521 is sleeved on the planetary shaft 540, and the second wheel 522 is fixed to the outside of the first wheel 521; the first wheel 521 meshes with the internal teeth of the ring gear 530, and the second wheel 522 meshes with the sun gear 510. In other words, the planetary gear mechanism 520 here has a dual-wheel structure, and the first wheel 521 and the second wheel 522 mesh with the ring gear 530 and the sun gear 510, respectively.

[0052] like Figure 1 and Figure 2 As can be seen from the figure, the specific connection method of the dual-motor drive system is as follows:

[0053] The first transmission wheel 100 is fixedly connected to the central shaft 11 , the third transmission wheel 300 is loosely sleeved on the central shaft 11 via a bearing, the output wheel 333 is fixedly connected to the third transmission wheel 300 , and the second mating wheel 620 is fixedly connected to the ring gear 530 .

[0054] The first motor shaft 411 is mounted on the rotor of the first motor 410, and the first mating gear 610 is fixedly connected to the first motor shaft 411. The second motor shaft 422 is mounted on the rotor of the second motor 420, and the sun gear 510 is fixedly connected to the second motor shaft 422 (the axis of the sun gear 510 is collinear with the axis of the second motor shaft 422).

[0055] The planetary shaft 540 is fixedly connected to the second transmission wheel 200, the second wheel 522 is fixedly connected to the first wheel 521, and the first wheel 521 is loosely sleeved on the planetary shaft 540 through a bearing. The third transmission wheel 300, the ring gear 530 and the second transmission wheel 200 are installed on the housing through bearings.

[0056] The third transmission wheel 300 is constantly meshed with the second transmission wheel 200 . The second mating wheel 620 and the first mating wheel 610 are bevel gears and are constantly meshed. The sun gear 510 is constantly meshed with the second wheel 522 .

[0057] The gear ring 530 is integrated with internal and external teeth, wherein the external teeth are constantly meshed with the first transmission wheel 100 , and the internal teeth are constantly meshed with the first wheel 521 .

[0058] The sun gear 510, second gear 522, first gear 521, planetary shafts 540, second transmission gear 200, and ring gear 530 form a planetary gear system. This planetary gear system is of NW type, but other types of planetary gear systems are also possible. The second transmission gear 200 serves as the planetary carrier of the planetary gear system. Gear, belt, or chain transmission can be used between the third transmission gear 300, ring gear 530, and output gear 333 and second transmission gear 200. The output gear 333 serves as the power output gear 333 of the entire drive system, outputting power via gears, belts, or chains. The axis of the central shaft 11 and the second motor shaft 422 are arranged parallel to each other. The axis of the second motor shaft 422 and the axis of the first motor shaft 411 intersect each other, and the first motor shaft 411 can be positioned at any desired angle within the cross-section of the second motor shaft 422. A speed change mechanism 700 can be installed between the first motor shaft 411 and the first mating gear 610 as needed to adjust the output torque and speed of the first motor 410.

[0059] Power transmission process:

[0060] The rider's pedaling force, acting on the center axle 11 through the crank, is converted into pedaling torque, driving the center axle 11 and the first transmission wheel 100 to rotate, which in turn drives the ring gear 530. Simultaneously, the driving torque of the first motor 410, via the first motor shaft 411, drives the first mating wheel 610 to rotate, which in turn drives the ring gear 530. At this point, the pedaling force and the driving force of the first motor 410 converge at the ring gear 530 for the first time: the combined power and torque act on the ring gear 530, effectively matching the rotational speeds.

[0061] The driving torque of the second motor 420 drives the sun gear 510 through the second motor shaft 422. The driving force of the sun gear 510 and the driving force of the ring gear 530 simultaneously act on the first and second planetary gears 521 and 522, driving the second transmission gear 200 (planet carrier) through the planetary gear system. At this point, the driving force acting on the ring gear 530 and the driving force of the second motor 420 achieve a second power confluence at the second transmission gear 200: the power and speed are superimposed on the ring gear 530, and the torque is matched in real time.

[0062] The second transmission wheel 200 transmits the combined driving force to the third transmission wheel 300, driving the third transmission wheel 300 and the output wheel 333 to rotate, thereby realizing power output of the electric drive system.

[0063] See also Figure 3 and Figure 4 As an alternative embodiment, the dual-motor drive system can omit the speed change mechanism 700. Instead, the first mating gear 610 is directly mounted on the end of the first motor shaft 411. Furthermore, the planetary gear mechanism 520 is a single planetary gear, which meshes with the internal teeth of the ring gear 530 and the sun gear 510. This arrangement provides a simpler structure and greater stability.

[0064] In a second aspect, the present invention provides an electric-assisted vehicle, comprising the dual-motor drive system of any of the aforementioned embodiments. It should be noted that the electric-assisted vehicle may be an electric-assisted bicycle, an electric bicycle, an electric motorcycle, etc., without limitation herein.

[0065] In summary, the embodiments of the present invention provide a dual-motor drive system and an electric-assisted vehicle, which have at least the following advantages:

[0066] The intersecting arrangement of the two motor axes can effectively reduce the overall thickness of the electric drive system, facilitate the arrangement of the system on the entire vehicle, and the first motor 410 can be hidden in the frame of the vehicle.

[0067] Through this transmission system, the rider's pedaling torque and the driving torque of the dual motors are coupled and output, realizing the functional innovation of the electric drive system that both assists and regulates speed.

[0068] This patented technology enables stepless speed regulation of the electric drive system's output speed, eliminating the need for a transmission system on the bicycle. This simplifies the overall vehicle structure and reduces costs.

[0069] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited to them. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this utility model should be included in the scope of protection of the present utility model. Therefore, the scope of protection of the present utility model should be based on the scope of protection of the claims.

Claims

1. A dual-motor drive system, characterized in that: include: A central shaft (11), a first transmission wheel (100), a planetary gear set (500), a first motor (410), a second motor (420), a second transmission wheel (200), and a third transmission wheel (300); The planetary gear set (500) includes a sun gear (510), a planetary gear mechanism (520) and a ring gear (530), wherein the planetary gear mechanism (520) meshes with the internal teeth of the sun gear (510) and the ring gear (530), respectively; the planetary gear mechanism (520) is sleeved on a planetary shaft (540), and the planetary shaft (540) is fixed to the second transmission wheel (200), so that the second transmission wheel (200) constitutes a planetary carrier; The first transmission wheel (100) is fixed on the central shaft (11), and the first transmission wheel (100) is in transmission connection with the ring gear (530); The first motor shaft (411) of the first motor (410) is in transmission connection with the ring gear (530); the second motor shaft (422) of the second motor (420) is in transmission connection with the sun gear (510) to drive the sun gear (510) to rotate; and the second transmission wheel (200) is in transmission connection with the third transmission wheel (300) to output power to the wheels.

2. The dual-motor drive system according to claim 1, characterized in that: The axis center line of the central axis (11) and the axis center line of the second motor shaft (422) are parallel to each other; and an angle is formed between the axis center line of the second motor shaft (422) and the axis center line of the first motor shaft (411).

3. The dual-motor drive system according to claim 2, characterized in that: It also includes a first mating wheel (610) and a second mating wheel (620); the second mating wheel (620) is arranged on the outer wall of the gear ring (530), and the first mating wheel (610) is arranged on the end of the first motor shaft (411); The first mating wheel (610) and the second mating wheel (620) are mated using bevel gears.

4. The dual-motor drive system according to claim 3, characterized in that: It also includes a speed change mechanism (700); the first motor shaft (411) is connected to the first mating wheel (610) through the speed change mechanism (700) to adjust the torque and speed output by the first motor (410) to the first mating wheel (610).

5. The dual-motor drive system according to claim 1, characterized in that: The third transmission wheel (300) is further provided with an output wheel (333), and the output wheel (333) can be connected to the wheel in a transmission manner.

6. The dual-motor drive system according to claim 5, characterized in that: The output wheel (333) is configured to output power to the wheel via gears, belts or chains.

7. The dual-motor drive system according to claim 1, characterized in that: The planetary gear set (500) is a NW type or NGW type gear train.

8. The dual-motor drive system according to claim 1, characterized in that: The planetary gear mechanism (520) includes a first gear (521) and a second gear (522); The first wheel (521) is sleeved on the planetary shaft (540), and the second wheel (522) is fixedly mounted on the outside of the first wheel (521); The first wheel (521) meshes with the internal teeth of the ring gear (530), and the second wheel (522) meshes with the sun gear (510).

9. The dual-motor drive system according to claim 1, characterized in that: The second transmission wheel (200) is configured to be connected to the third transmission wheel (300) via gear transmission, belt transmission or chain transmission; And / or, the first transmission wheel (100) is configured to be connectable to the ring gear (530) via gear transmission, belt transmission or chain transmission.

10. An electric power-assisted vehicle, characterized in that: The electric-assisted vehicle includes the dual-motor drive system according to any one of claims 1 to 9.

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