Double-motor electric drive system

Abstract

The invention relates to the technical field of transmission, in particular to a double-motor electric drive system which specifically comprises a box body, a first planetary gear train, a second planetary gear train, a first motor, a first motor shaft, a second motor, a second motor shaft, a fifth transmission wheel, a first transmission wheel and a pedal shaft. At least one second planet shaft is connected with a fifth transmission wheel; the first transmission wheel is in transmission fit with the fifth transmission wheel through the second transmission wheel; a third transmission wheel on the pedal shaft is in transmission fit with the gear ring; the double-motor electric drive system achieves power confluence at two positions, wherein the first position is that manpower treading power input through a pedal shaft and input power of a first motor achieve first-time power confluence at the position of a gear ring, and the second position is that power transmitted by the gear ring and input power of a second motor achieve second-time power confluence at the position of a fifth transmission wheel. In this way, stepless speed change adjustment can be achieved through double-motor regulation and control, the overall structure is simple, and cost is lower.

Description

Technical Field

[0001] The present invention relates to the field of transmission technology, and in particular to a dual-motor electric drive system. Background Art

[0002] Most of the electric drive systems of existing electric-assisted bicycles can only assist, and the riding speed is adjusted through the speed change system on the bicycle. A few manufacturers' products have speed change functions, such as MGU and Valeo, which use traditional gear shifting technology to achieve step-by-step speed adjustment of the electric drive system. At the same time, the electric drive systems of existing electric-assisted bicycles are equipped with torque sensors and cadence sensors, which are the basis for realizing intelligent control.

[0003] That is, the electric drive system of most electric bicycles on the market includes a separate motor and a speed change mechanism. Such a structure can only meet the needs of electric drive, but cannot achieve convenient and fast speed change; at the same time, the separate motor and speed change mechanism make the entire electric drive system complex and large in size, which brings inconvenience to loading and unloading and maintenance. Summary of the invention

[0004] The objects of the present invention include, for example, providing a dual-motor electric drive system that can achieve stepless speed regulation through dual-motor control, and has a simple overall structure and lower cost.

[0005] The embodiments of the present invention can be implemented as follows:

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

[0007] Box body, first planetary gear train, second planetary gear train, first motor, first motor shaft, second motor, second motor shaft, fifth transmission wheel, first transmission wheel, pedal shaft;

[0008] The first planetary gear train includes a ring gear, a first planet carrier, a first sun gear, a first planet gear and a first planet shaft that cooperate with each other; the first planet carrier is integrated on the housing, and the first motor is connected to the first sun gear through a first motor shaft to drive the first sun gear to rotate;

[0009] The second planetary gear train includes a ring gear, a second sun gear, a second planet gear and a second planet shaft that cooperate with each other; the second motor is connected to the second sun gear through a second motor shaft to drive the second sun gear to rotate;

[0010] The fifth transmission wheel is rotatably arranged in the box body through a bearing; at least one of the second planetary shafts is connected to the fifth transmission wheel, so that when the second planetary wheel revolves, the fifth transmission wheel can be driven to rotate;

[0011] The first transmission wheel cooperates with the fifth transmission wheel through the second transmission wheel, so that the fifth transmission wheel can drive the first transmission wheel to rotate;

[0012] A third transmission wheel is arranged on the pedal shaft, and the third transmission wheel cooperates with the gear ring to drive the gear ring to rotate through the rotation of the pedal shaft;

[0013] The dual-motor electric drive system realizes power confluence in two places: the first is the human pedaling power P input through the pedal shaft 脚踏 With the first motor input power P M1 The first power confluence is achieved at the ring gear, and the analytical expression of the power synthesis relationship at this time is:

[0014] Power: P 齿圈 =P M1 +P 脚踏 ;

[0015] Torque: T 齿圈 =k1T M1 +k2T 脚踏 ;

[0016] Speed: n 齿圈 =k1n 脚踏 =k2n M1 ;

[0017] Among them, P 齿圈 is the power of the ring gear, P M1 is the input power of the first motor, P 脚踏 is the power of human pedaling the pedal shaft, T 齿圈 is the torque of the ring gear, T M1 is the torque of the first motor, T 脚踏 is the torque of the pedal shaft, n 齿圈 is the speed of the ring gear, n 脚踏 is the rotation speed of the pedal shaft, n M1 is the speed of the first motor, k1 is the transmission ratio from the pedal shaft to the ring gear, and k2 is the transmission ratio from the first motor to the ring gear;

[0018] The second is the power transmitted by the ring gear and the input power P of the second motor M2 The second power combination is realized at the fifth transmission wheel, and the analytical expression of the power combination relationship at this time is:

[0019] Power: P 行星架 =P 齿圈 +P M2 ;

[0020] Torque: T 行星架 =k3T 齿圈 =k4T M2 ;

[0021] Speed: n 行星架 =k3n 齿圈 +k4n M2 ;

[0022] P 行星架 is the power of the fifth transmission wheel, P M2 is the input power of the second motor, T 行星架 is the torque of the fifth transmission wheel, T M2 is the torque of the first motor, n 行星架 is the speed of the fifth transmission wheel, n M2 is the speed of the second motor, k3 is the transmission ratio from the ring gear to the fifth transmission wheel, and k4 is the transmission ratio from the second motor to the fifth transmission wheel.

[0023] In an optional embodiment, the second planetary gear is rotatably disposed on one end of the second planetary shaft via a bearing, and the other end of the second planetary shaft is fixedly disposed on the fifth transmission wheel.

[0024] In an optional embodiment, the second planetary shaft is arranged on the fifth transmission wheel, so that the fifth transmission wheel can serve as a planet carrier of the second planetary wheel.

[0025] In an optional embodiment, the first planetary gear is rotatably disposed on one end of the first planetary shaft via a bearing, and the other end of the first planetary shaft is fixed on the housing.

[0026] In an optional embodiment, the axis center line of the fifth transmission wheel, the axis center line of the first sun gear and the axis center line of the second sun gear are all coaxially arranged.

[0027] In an optional embodiment, the second transmission wheel and the fifth transmission wheel may be gear-driven, belt-driven or chain-driven;

[0028] And / or gear transmission, belt transmission or chain transmission can be adopted between the third transmission wheel and the ring gear.

[0029] In an optional embodiment, the first transmission wheel can be designed as a gear, a belt wheel or a sprocket.

[0030] In an optional embodiment, the second transmission wheel is coaxially arranged with the first transmission wheel; the fifth transmission wheel is in transmission cooperation with the second transmission wheel, so that when the fifth transmission wheel rotates, the first transmission wheel is driven to rotate through the second transmission wheel.

[0031] In an optional embodiment, the second transmission wheel is coaxially arranged with the pedal shaft, and the first transmission wheel is fixed on the second transmission wheel.

[0032] In an optional embodiment, along the axial direction of the gear ring, the first motor and the second motor are respectively located on both sides of the gear ring.

[0033] The beneficial effects of the embodiments of the present invention include, for example:

[0034] A dual-motor electric drive system of the present invention includes a housing, a first planetary gear train, a second planetary gear train, a first motor, a second motor, a fifth transmission wheel, a first transmission wheel, and a pedal shaft. When in use, the pedaling force of the pedal alone drives the pedal shaft and the third transmission wheel to rotate and drive the ring gear to rotate, and at the same time, the first motor works and cooperates with the first planetary gear train to drive the ring gear to rotate, so that the driving force from the pedal and the first motor power are combined at the ring gear for the first time. Further, the second motor works and cooperates with the second planetary gear train to drive the fifth transmission wheel and the first transmission wheel to rotate in turn, so that the power combined for the first time at the ring gear and the second motor power are combined for the second time at the fifth transmission wheel. In addition, by collecting the real-time speed of the first motor, the real-time frequency of the rider's pedaling can be sensed, so that the first motor has the function of a pedaling frequency sensor; by respectively collecting the real-time torque of the first motor and the second motor, the real-time torque of the rider's pedaling can be sensed through the coupling relationship of power confluence, so that the second motor has the function of a torque sensor. In summary, the first motor of such a dual-motor electric drive system can adjust the torque, and the second motor can adjust the speed, thus achieving functional innovation of both assisting power and speed; at the same time, because a separate gear transmission mechanism is omitted, the vehicle structure is simplified and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 Schematic diagram of the structure of a dual-motor electric drive system according to an embodiment of the present invention.

[0037] Icons: A01-first transmission wheel; A02-second transmission wheel; A03-third transmission wheel; A05-pedal shaft; B01-first motor; B02-first motor shaft; B03-second motor; B04-second motor shaft; C01-box; D01-first sun gear; D02-first planetary shaft; D03-first planetary gear; D04-ring gear; D05-second planetary gear; D06-fifth transmission wheel; D07-second planetary shaft; D08-second sun gear. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] 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, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0043] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0044] Please refer to Figure 1 , this embodiment provides a dual-motor electric drive system, including:

[0045] Box C01, first planetary gear train, second planetary gear train, first motor B01, first motor shaft B02, second motor B03, second motor shaft B04, fifth transmission wheel D06, first transmission wheel A01, pedal shaft A05;

[0046] The first planetary gear train includes a ring gear D04, a first planet carrier, a first sun gear D01, a first planet gear D03 and a first planet shaft D02 that cooperate with each other; the first planet carrier is integrated on the housing C01, and the first motor B01 is connected to the first sun gear D01 through the first motor shaft B02 to drive the first sun gear D01 to rotate;

[0047] The second planetary gear train includes a ring gear D04, a second sun gear D08, a second planet gear D05 and a second planet shaft D07 that cooperate with each other; the second motor B03 is connected to the second sun gear D08 through the second motor shaft B04 to drive the second sun gear D08 to rotate;

[0048] The fifth transmission wheel D06 is rotatably disposed in the housing C01 through a bearing; at least one second planetary shaft D07 is connected to the fifth transmission wheel D06, so that when the second planetary wheel D05 revolves, the fifth transmission wheel D06 is driven to rotate;

[0049] The first transmission wheel A01 cooperates with the fifth transmission wheel D06 through the second transmission wheel A02, so that the fifth transmission wheel D06 can drive the first transmission wheel A01 to rotate;

[0050] A third transmission wheel A03 is provided on the pedal shaft A05, and the third transmission wheel A03 cooperates with the ring gear D04 to drive the ring gear D04 to rotate through the rotation of the pedal shaft A05;

[0051] The dual-motor electric drive system realizes power confluence at two locations: the first is the human pedaling power P input through the pedal shaft A05. 脚踏 The first motor B01 input power P M1 The first power confluence is achieved at the gear ring D04, and the analytical expression of the power synthesis relationship at this time is:

[0052] Power: P 齿圈 =P M1 +P 脚踏 ;

[0053] Torque: T 齿圈 =k1T M1 +k2T 脚踏 ;

[0054] Speed: n 齿圈 =k1n 脚踏 =k2n M1 ;

[0055] Among them, P 齿圈 is the power of the ring gear D04, P M1 is the input power of the first motor B01, P 脚踏 is the power of human pedaling the pedal shaft A05, T 齿圈is the torque of the ring gear D04, T M1 is the torque of the first motor B01, T 脚踏 is the torque of pedal shaft A05, n 齿圈 is the speed of the ring gear D04, n 脚踏 is the speed of pedal shaft A05, n M1 is the speed of the first motor B01, k1 is the transmission ratio from the pedal shaft A05 to the ring gear D04, and k2 is the transmission ratio from the first motor B01 to the ring gear D04;

[0056] The second is the power transmitted by the ring gear D04 and the input power P of the second motor B03 M2 The second power confluence is realized at the fifth transmission wheel D06, and the power confluence relationship at this time is expressed as:

[0057] Power: P 行星架 =P 齿圈 +P M2 ;

[0058] Torque: T 行星架 =k3T 齿圈 =k4T M2 ;

[0059] Speed: n 行星架 =k3n 齿圈 +k4n M2 ;

[0060] P 行星架 is the power of the fifth transmission wheel D06, P M2 is the input power of the second motor B03, T 行星架 is the torque of the fifth transmission wheel D06, T M2 is the torque of the first motor B01, n 行星架 is the speed of the fifth transmission wheel D06, n M2 is the rotation speed of the second motor B03, k3 is the transmission ratio from the ring gear D04 to the fifth transmission wheel D06, and k4 is the transmission ratio from the second motor B03 to the fifth transmission wheel D06.

[0061] The dual-motor electric drive system is a system in which the pedaling force of a single pedal drives the pedal shaft A05 and the third transmission wheel A03 in turn to rotate and drive the ring gear D04 to rotate. At the same time, the first motor B01 works and cooperates with the first planetary gear system to drive the ring gear D04 to rotate. In this way, the driving force from pedaling and the power of the first motor B01 are combined for the first time at the ring gear D04.

[0062] Furthermore, the second motor B03 works and cooperates with the second planetary gear train to drive the fifth transmission wheel D06 and the first transmission wheel A01 to rotate in turn, so that the power that merges for the first time at the ring gear D04 and the power of the second motor B03 realize the second power merger at the fifth transmission wheel D06.

[0063] In addition, by collecting the real-time rotation speed of the first motor B01, the real-time pedaling frequency of the rider can be sensed, so that the first motor B01 can function as a pedaling frequency sensor; at the same time, by respectively collecting the real-time torque of the first motor B01 and the second motor B03, the real-time pedaling torque of the rider can be sensed through the coupling relationship of power confluence, so that the second motor B03 functions as a torque sensor. The first motor of this system can adjust the torque, and the second motor can adjust the rotation speed, thus realizing the functional innovation of both assisting power and speed; at the same time, because a separate gear transmission mechanism is omitted, the whole vehicle structure is simplified and the cost is reduced.

[0064] Furthermore, both the first motor B01 and the second motor B03 adopt a vector control strategy and are controlled using a spatial vector modulation algorithm.

[0065] The first motor B01 is in torque control mode. The speed of the first motor B01 automatically matches the speed of the first sun gear D01 in real time under the control strategy. Since the first sun gear D01 has a fixed transmission ratio with the ring gear D04 and the third transmission wheel A03, the speed of the first motor B01 matches the speed of the pedal shaft A05 in real time.

[0066] The second motor B03 is in speed control mode. Under the control strategy, the torque of the second motor B03 automatically matches the pedal torque and the coupling torque of the first motor B01 on the fifth transmission wheel D06 in real time. Since the pedal torque, the power of the first motor B01 and the second motor B03 are respectively transmitted to the fifth transmission wheel D06 with fixed transmission ratios, the real-time pedal torque can be analytically calculated through the torque balance relationship among the three.

[0067] The first motor B01 functions as a pedaling frequency sensor, and the real-time pedaling frequency of the rider can be sensed by collecting the real-time rotation speed of the first motor B01.

[0068] The second motor B03 functions as a torque sensor. By respectively collecting the real-time torques of the first motor B01 and the second motor B03 and through the coupling relationship of power confluence, it can sense the rider's real-time pedaling torque.

[0069] In an optional embodiment, the second planetary gear D05 is rotatably disposed on one end of the second planetary shaft D07 via a bearing, and the other end of the second planetary shaft D07 is fixedly disposed on the fifth transmission wheel D06.

[0070] In an optional embodiment, the second planetary shaft D07 is disposed on the fifth transmission wheel D06, so that the fifth transmission wheel D06 can serve as a planet carrier of the second planetary wheel D05.

[0071] In an optional embodiment, the first planetary gear D03 is rotatably disposed on one end of the first planetary shaft D02 via a bearing, and the other end of the first planetary shaft D02 is fixed on the box body C01.

[0072] One end of the pedal shaft A05 is mounted on the box body C01 through a bearing, and the other end is mounted in the hole of the second transmission wheel A02 through a bearing. The second transmission wheel A02 is mounted on the box body C01 through a bearing. The third transmission wheel A03 is mounted on the pedal shaft A05 through a first bearing A04. Both ends of the pedal shaft A05 extend out of the box body C01 and are connected to the mounting crank.

[0073] from Figure 1 It can also be seen that in an optional embodiment, the axis of the fifth transmission wheel D06, the axis of the first sun wheel D01 and the axis of the second sun wheel D08 are all coaxially arranged. This ensures the stability of the power transmission process and can also reduce the volume of the entire box C01.

[0074] In an optional embodiment, the second transmission wheel A02 and the fifth transmission wheel D06 may be driven by gears, belts or chains; and / or the third transmission wheel A03 and the ring gear D04 may be driven by gears, belts or chains.

[0075] In this embodiment, the second transmission wheel A02 and the fifth transmission wheel D06 are matched through gear transmission.

[0076] It can also be seen from the figure that the ring gear D04 is installed on the housing C01 through a bearing, and the ring gear D04 is provided with external teeth D042, internal teeth D041 and internal teeth D043.

[0077] The inner teeth D041 mesh with the outer teeth of the first planetary gear D03, the inner teeth D043 mesh with the outer teeth of the second planetary gear D05; and the outer teeth D042 mesh with the outer teeth of the third transmission wheel A03, so that the ring gear D04 and the third transmission wheel A03 are gear-coordinated.

[0078] In an optional embodiment, the first transmission wheel A01 can be designed as a gear, a pulley or a sprocket. When the first transmission wheel A01 is a sprocket, the first transmission wheel A01 can also be used as a common crankset bicycle. In an optional embodiment, the second transmission wheel A02 is coaxially arranged with the first transmission wheel A01; the fifth transmission wheel D06 is in transmission cooperation with the second transmission wheel A02, so that when the fifth transmission wheel D06 rotates, the first transmission wheel A01 is driven to rotate through the second transmission wheel A02. In this way, the path of power transmission can be shortened.

[0079] In an optional embodiment, the second transmission wheel A02 is coaxially arranged with the pedal shaft A05, and the first transmission wheel A01 is fixedly arranged on the second transmission wheel A02. In this embodiment, the second transmission wheel A02 is sleeved on the pedal shaft A05.

[0080] In an optional embodiment, along the axis direction of the gear ring D04, the first motor B01 and the second motor B03 are respectively located on both sides of the gear ring D04. This arrangement makes the overall structure coordinated and symmetrical, improves the aesthetics of the product, and the two motors are respectively arranged on both sides of the box C01 to facilitate the heat dissipation of the motors.

[0081] The rotor of the first motor B01 is arranged on the first motor shaft B02, the first sun gear D01 is integrated or installed on the first motor shaft B02, the first planetary shaft D02 is installed on the housing C01, the first planetary gear D03 is loosely mounted on the first planetary shaft D02, and the first planetary gear D03 is meshed with the first sun gear D01 and the inner teeth D401 of the ring gear D04 at the same time. When more than one first planetary shaft D02 and first planetary gear D03 are arranged circumferentially, the first sun gear D01, the first planetary gear D03, the first planetary gear D03, the ring gear D04 and the housing C01 (i.e., the planet carrier of the first planetary system) constitute the first planetary gear system PG1.

[0082] The rotor of the second motor B03 is arranged on the second motor shaft B04, the second sun gear D08 is integrated or installed on the second motor shaft B04, the second planetary shaft D07 is installed on the fifth transmission wheel D06, the second planetary gear D05 is loosely mounted on the second planetary shaft D07, and the second planetary gear D05 is meshed with the second sun gear D08 and the inner teeth D403 of the ring gear D04 at the same time. When more than one second planetary shaft D07 and second planetary gear D05 are arranged circumferentially on the fifth transmission wheel D06, the second sun gear D08, the second planetary gear D05, the second planetary shaft D07, the ring gear D04 and the fifth transmission wheel D06 (i.e., the planet carrier of the second planetary system) constitute another second planetary gear system PG2.

[0083] The ring gear D04, the second sun gear D08 and the fifth transmission gear D06 are three power application points. If any two of the power application points input power according to the set requirements, the other power application point will output power according to the set requirements.

[0084] In summary, the embodiment of the present invention provides a dual-motor electric drive system, which has at least the following advantages:

[0085] The electric drive system of the existing electric power-assisted bicycle is equipped with a dedicated pedaling frequency sensor and torque sensor to collect pedaling torque and pedaling frequency information. This solution uses two motors to realize the functions of the two sensors respectively.

[0086] The electric drive system of existing electric-assisted bicycles has only one power coupling: the motor torque is superimposed on the pedaling torque, the speed is automatically matched with the pedaling frequency in real time, and the speed of the whole vehicle is determined by the pedaling frequency. This solution is equipped with dual motors, designed with three power input points, and the power confluence is designed at two locations in the structure to achieve both power assistance and speed assistance (regulation). The speed of the whole vehicle is determined by the coupling of the pedaling frequency and the speed of the speed-assisting motor.

[0087] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A dual-motor electric drive system, characterized in that: include: Box body (C01), first planetary gear train, second planetary gear train, first motor (B01), first motor shaft (B02), second motor (B03), second motor shaft (B04), fifth transmission wheel (D06), first transmission wheel (A01), pedal shaft (A05); The first planetary gear train comprises a ring gear (D04), a first planet carrier, a first sun gear (D01), a first planet gear (D03) and a first planet shaft (D02) that cooperate with each other; the first planet carrier is integrated on the housing (C01), and the first motor (B01) is connected to the first sun gear (D01) via a first motor shaft (B02) so as to drive the first sun gear (D01) to rotate; The second planetary gear train comprises a ring gear (D04), a second sun gear (D08), a second planet gear (D05) and a second planet shaft (D07) that cooperate with each other; the second motor (B03) is connected to the second sun gear (D08) via the second motor shaft (B04) so ​​as to drive the second sun gear (D08) to rotate; The fifth transmission wheel (D06) is rotatably arranged in the housing (C01) via a bearing; at least one of the second planetary shafts (D07) is connected to the fifth transmission wheel (D06) so that when the second planetary wheel (D05) revolves, the fifth transmission wheel (D06) is driven to rotate; The first transmission wheel (A01) is in transmission cooperation with the fifth transmission wheel (D06) through the second transmission wheel (A02), so that the fifth transmission wheel (D06) can drive the first transmission wheel (A01) to rotate; A third transmission wheel (A03) is arranged on the pedal shaft (A05), and the third transmission wheel (A03) cooperates with the gear ring (D04) in transmission, so that the gear ring (D04) is driven to rotate by the pedal shaft (A05); The dual-motor electric drive system realizes power confluence at two locations: the first is the human pedaling power P input through the pedal shaft (A05). 脚踏 The first motor (B01) input power P M1 The first power combination is realized at the ring gear (D04), and the analytical expression of the power combination relationship at this time is: Power: P 齿圈 =P M1 +P 脚踏 ; Torque: T 齿圈 =k1T M1 +k2T 脚踏 ; Speed: n 齿圈 =k1n 脚踏 =k2n M1 ; Among them, P 齿圈 is the power of the ring gear (D04), P M1 is the input power of the first motor (B01), P 脚踏 is the power of human pedaling the pedal shaft (A05), T 齿圈 is the torque of the ring gear (D04), T M1 is the torque of the first motor (B01), T 脚踏 is the torque of the pedal shaft (A05), n 齿圈 is the speed of the ring gear (D04), n 脚踏 is the speed of the pedal shaft (A05), n M1 is the rotation speed of the first motor (B01), k1 is the transmission ratio from the pedal shaft (A05) to the ring gear (D04), and k2 is the transmission ratio from the first motor (B01) to the ring gear (D04); The second is the power transmitted by the ring gear (D04) and the input power P of the second motor (B03) M2 The second power combination is realized at the fifth transmission wheel (D06), and the analytical expression of the power combination relationship at this time is: Power: P 行星架 =P 齿圈 +P M2 ; Torque: T 行星架 =k3T 齿圈 =k4T M2 ; Speed: n 行星架 =k3n 齿圈 +k4n M2 ; P 行星架 is the power of the fifth transmission wheel (D06), P M2 is the input power of the second motor (B03), T 行星架 is the torque of the fifth transmission wheel (D06), T M2 is the torque of the first motor (B01), n 行星架 is the speed of the fifth transmission wheel (D06), n M2 is the rotation speed of the second motor (B03), k3 is the transmission ratio from the ring gear (D04) to the fifth transmission wheel (D06), and k4 is the transmission ratio from the second motor (B03) to the fifth transmission wheel (D06).

2. The dual-motor electric drive system according to claim 1, characterized in that: The second planetary gear (D05) is rotatably arranged on one end of the second planetary shaft (D07) via a bearing, and the other end of the second planetary shaft (D07) is fixed on the fifth transmission wheel (D06).

3. The dual-motor electric drive system according to claim 2, characterized in that: The second planetary shaft (D07) is arranged on the fifth transmission wheel (D06) so that the fifth transmission wheel (D06) can serve as a planet carrier of the second planetary wheel (D05).

4. The dual-motor electric drive system according to claim 2, characterized in that: The first planetary gear (D03) is rotatably arranged on one end of the first planetary shaft (D02) via a bearing, and the other end of the first planetary shaft (D02) is fixed on the box body (C01).

5. The dual-motor electric drive system according to claim 1, characterized in that: The axis center line of the fifth transmission wheel (D06), the axis center line of the first sun wheel (D01) and the axis center line of the second sun wheel (D08) are all coaxially arranged.

6. The dual-motor electric drive system according to claim 1, characterized in that: The second transmission wheel (A02) and the fifth transmission wheel (D06) are gear-driven, belt-driven or chain-driven; And / or gear transmission, belt transmission or chain transmission is adopted between the third transmission wheel (A03) and the gear ring (D04).

7. The dual-motor electric drive system according to claim 1, characterized in that: The first transmission wheel (A01) is configured as a gear, a pulley or a sprocket.

8. The dual-motor electric drive system according to claim 1, characterized in that: The second transmission wheel (A02) is coaxially arranged with the first transmission wheel (A01); the fifth transmission wheel (D06) is in transmission cooperation with the second transmission wheel (A02), so that when the fifth transmission wheel (D06) rotates, the first transmission wheel (A01) is driven to rotate through the second transmission wheel (A02).

9. The dual-motor electric drive system according to claim 8, characterized in that: The second transmission wheel (A02) is coaxially arranged with the pedal shaft (A05), and the first transmission wheel (A01) is fixed on the second transmission wheel (A02).

10. The dual-motor electric drive system according to claim 1, characterized in that: Along the axial direction of the gear ring (D04), the first motor (B01) and the second motor (B03) are respectively located on two sides of the gear ring (D04).

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