Inter-wheel torque distribution electric drive axle with dual-motor torque coupling function

Abstract

The invention discloses an inter-wheel torque distribution electric drive axle with a dual-motor torque coupling function. The inter-wheel torque distribution electric drive axle comprises a main drive motor (100), a main rotation speed reducer (200), a differential mechanism (300), a right half shaft (400), a mode switching mechanism (500), an internal and external meshing duplex planetary gear mechanism (600), a cylindrical gear transmission mechanism (700), a torque distribution motor (800) and a left half shaft (900). According to the invention, the output torques of the main drive motor (100) and the torque distribution motor (800) and the position of the combination sleeve of the mode switching mechanism (500) are controlled; therefore, four working modes including a main driving motor independent driving mode, a torque distribution motor independent driving mode, a main driving motor-torque distribution motor torque coupling driving mode and a main driving motor driving torque inter-wheel distribution mode can be realized. Through reasonable switching of the four working modes, the dynamic property, the economical efficiency and the handling stability of the vehicle under the complex working conditions can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the field of electric vehicle transmission, and in particular relates to an inter-wheel torque distribution electric drive bridge with a dual-motor torque coupling function. Background Art

[0002] Electric vehicles have the advantages of low carbon and environmental protection. The development of new energy vehicles is an important means to solve the current energy crisis and urban air pollution. The current electric vehicle drive axle system generally inherits the internal combustion engine drive platform and adopts a centralized drive form of "motor + reducer / transmission". This drive form has the advantages of being mature, reliable and easy to arrange the whole vehicle. However, the centralized drive system generally uses an open differential to achieve the kinematic coordination of the left and right wheels during the turning process. The working characteristics of the open differential are "differential speed but not torque difference", that is, the speed of the output ends of the two sides of the differential can be different but the torque must be the same. Although it can effectively avoid the wear problem of the wheels on both sides during the vehicle turning process, the characteristic that the driving torque of the left and right wheels is always equally distributed limits the freedom of the vehicle chassis control, which is not conducive to the improvement of the vehicle chassis dynamics performance.

[0003] The inter-wheel torque distribution drive technology can realize the arbitrary distribution of the driving torque between the wheels on both sides, thereby effectively balancing the road adhesion utilization rate of each wheel, improving the stability margin of the vehicle, and improving the dynamic performance qualities such as the vehicle's turning maneuverability and extreme controllability. It is one of the key technical fields for the development of future automotive intelligent chassis systems. Distributed drive systems represented by wheel hub motors have the advantage of independent controllable driving torque of each wheel. However, due to unfavorable factors such as insufficient power density of wheel hub motors, increased unsprung mass, and difficulty in synchronous coordination control of dual-motor overdrive systems under high-speed conditions, this type of drive form has not yet been promoted and applied in large-scale industrialization in the field of passenger cars. Therefore, how to inherit the mature, reliable and convenient platform foundation of the traditional centralized drive system and realize the functions of arbitrary controllable and bidirectional transfer of the driving torque of the wheels on both sides is of great significance to the improvement of the dynamic performance of the chassis of electric vehicles.

[0004] In addition, the power and economy of electric vehicles are two important performance indicators of vehicles. For single-motor driven electric vehicles, there is a contradiction between vehicle power and economy, that is, if the vehicle is to have good power, a larger power motor must be selected, which will inevitably lead to the situation of "a big horse pulling a small cart" and worsen the vehicle's economy. On the contrary, if the vehicle is to have good economic performance, the vehicle's power will inevitably be affected. Dual-motor driven vehicles can effectively balance the contradiction between the two different performances, and effectively improve the vehicle's power and economy by reasonably matching the driving torque between the two motors.

[0005] Aiming at the technical requirements of electric drive axles for the power, economy and high chassis dynamics performance of electric vehicles mentioned in the above background, the present invention proposes an inter-wheel torque distribution electric drive axle with dual motor torque coupling function. On the basis of the traditional centralized electric drive axle, it only adopts a set of mode switching mechanism, with the use of an internal and external meshing double planetary gear mechanism and a pair of cylindrical gear transmission mechanisms, it can realize four working modes: main drive motor independent drive mode, torque distribution motor independent drive mode, main drive motor-torque distribution motor torque coupling drive mode, main drive motor drive torque inter-wheel distribution mode. The drive axle can effectively improve the power, economy, handling stability and passability of the vehicle under complex working conditions by switching between different working modes, and has important engineering application value. Summary of the invention

[0006] The purpose of the present invention is to propose an inter-wheel torque distribution electric drive axle with dual motor torque coupling function, which has a compact structure and high transmission efficiency, and can realize four working modes: main drive motor independent drive mode, torque distribution motor independent drive mode, main drive motor-torque distribution motor torque coupling drive mode, and main drive motor drive torque inter-wheel distribution mode. Through the precise control of the position of the mode switching mechanism coupling sleeve, the invented electric drive axle can switch between the four working modes to meet the vehicle's various needs for driving force.

[0007] To achieve the above purpose, the technical solution provided by the present invention is:

[0008] An inter-wheel torque distribution electric drive axle with a dual-motor torque coupling function, characterized by comprising: a main drive motor (100), a main reducer (200), a differential (300), a right half shaft (400), a mode switching mechanism (500), an internal and external meshing double-coupled planetary gear mechanism (600), a cylindrical gear transmission mechanism (700), a torque distribution motor (800), and a left half shaft (900);

[0009] The main reducer (200) comprises: a first shaft (201), a primary reduction driving gear (202), a primary reduction driven gear (203), a second shaft (204), a secondary reduction driving gear (205), and a secondary reduction driven gear (206); the primary reduction driving gear (202) is externally meshed with the primary reduction driven gear (203); the secondary reduction driving gear (205) is externally meshed with the secondary reduction driven gear (206); the first shaft (201) is connected to the power output end of the main drive motor (100) via a spline; the primary reduction driving gear (202) is connected to the first shaft (201) via a flat key; the secondary reduction driving gear (205) is connected to the second shaft (204) via a flat key; and the secondary reduction driven gear (206) is fixedly connected to the housing of the differential (300);

[0010] The mode switching mechanism (500) comprises: a spline hub (501), a right gear ring (502), a coupling sleeve (503), and a left gear ring (504).

[0011] The internally and externally meshing double planetary gear mechanism (600) comprises: a sun gear (601), a planetary gear one (602), a planetary shaft (603), a planetary gear two (604), a ring gear (605), and a planet carrier (606); the sun gear (601) is connected to the power output shaft of the torque distribution motor (800) via a spline; the planetary gear one (602) is externally meshed with the sun gear (601); the planetary gear two (604) is internally meshed with the ring gear (605); the planetary gear one (602) is connected to the left end of the planetary shaft (603) via a flat key; and the planetary gear two (604) is connected to the right end of the planetary shaft (603) via a flat key;

[0012] The cylindrical gear transmission mechanism (700) comprises: a driving cylindrical gear (701) and a driven cylindrical gear (702), the driving cylindrical gear (701) and the driven cylindrical gear (702) being externally meshed, the driving cylindrical gear (701) being fixedly connected to the planet carrier (606), and the driven cylindrical gear (702) being connected to the second shaft (204) via a flat key;

[0013] The torque distribution motor (800) is a hollow inner rotor motor, and its hollow shaft inner rotor is supported by an empty sleeve on the left half shaft (900).

[0014] Preferably, the spline hub (501) of the mode switching mechanism (500) is connected to the ring gear (605) via a spline, the left ring gear (504) is connected to a fixed end, and the right ring gear (502) is connected to the left half shaft (900) via a flat key.

[0015] Preferably, by controlling the output torques of the main drive motor (100) and the torque distribution motor (800) and the position of the coupling sleeve (503) of the mode switching mechanism (500), the inter-wheel torque distribution electric drive bridge with dual-motor torque coupling function can realize four working modes: a main drive motor independent drive mode, a torque distribution motor independent drive mode, a main drive motor-torque distribution motor torque coupling drive mode, and a main drive motor drive torque inter-wheel distribution mode;

[0016] When the main drive motor (100) outputs torque and the torque distribution motor (800) does not output torque, the coupling sleeve (503) is located in a middle position, and at this time, the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function operates in a main drive motor independent drive mode, and the vehicle is independently driven by the output torque of the main drive motor (100);

[0017] When the main drive motor (100) does not output torque, the torque distribution motor (800) outputs torque, and the coupling sleeve (503) is located at the left end position to connect the spline hub (501) with the left ring gear (504), at which time the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function operates in a torque distribution motor independent drive mode, and the vehicle is independently driven by the output torque of the torque distribution motor (800);

[0018] When the main drive motor (100) outputs torque and the torque distribution motor (800) outputs torque, the coupling sleeve (503) is located at the left end position to connect the spline hub (501) with the left gear ring (504). At this time, the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function operates in a main drive motor-torque distribution motor torque coupling drive mode, and relies on the output torque of the main drive motor (100) and the output torque of the torque distribution motor (800) to jointly drive the vehicle to travel;

[0019] When the main drive motor (100) outputs torque and the torque distribution motor (800) outputs torque, the coupling sleeve (503) is located at the right end position to connect the spline hub (501) with the right gear ring (502), and the inter-wheel torque distribution electric drive axle with dual motor torque coupling function operates in the main drive motor drive torque inter-wheel distribution mode, and relies on the output torque of the main drive motor (100) to drive the vehicle to travel, and relies on the output torque of the torque distribution motor (800) to transfer and distribute the output torque of the main drive motor (100) between the left half shaft (900) and the right half shaft (400).

[0020] Preferably, in order to ensure that when the main drive motor driving torque is distributed among the wheels, the torque increase of the half shaft on the torque increase side is equal to the torque decrease of the half shaft on the torque decrease side, the number of teeth of the cylindrical gear transmission mechanism (700) is designed to be: ;

[0021] in, is the number of teeth of the driving cylindrical gear (701), is the number of teeth of the driven cylindrical gear (702), is the number of teeth of the secondary reduction driving gear (205), is the number of teeth of the secondary reduction driven gear (206), is a characteristic parameter of the internal and external meshing double planetary gear mechanism (600), The value is the multiplication of the tooth number ratio of the planetary gear 1 (602) to the sun gear (601) and the tooth number ratio of the ring gear (605) to the planetary gear 2 (604).

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The inter-wheel torque distribution electric drive axle with dual-motor torque coupling function described in the present invention can effectively overcome the disadvantage of the traditional electric drive axle that the driving torque of the wheels on both sides is always the same due to the use of an open differential. It can realize the arbitrary transfer and distribution of the driving torque between the left and right wheels while ensuring that the total driving torque remains unchanged, thereby significantly improving the vehicle's passability and active safety.

[0024] 2. The inter-wheel torque distribution electric drive axle with dual-motor torque coupling function described in the present invention can reasonably distribute the driving torque required for vehicle driving between the two motors, thereby effectively improving the power and economy of the vehicle.

[0025] 3. The inter-wheel torque distribution electric drive axle with dual-motor torque coupling function described in the present invention is composed only of a motor and a mechanical transmission mechanism, has the advantages of high integration, high reliability and high transmission efficiency, and has good engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an inter-wheel torque distribution electric drive axle with dual-motor torque coupling function described in the present invention.

[0028] Figure 2 It is a schematic diagram of torque flow when the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function described in the present invention works in the independent drive mode of the main drive motor.

[0029] Figure 3 It is a schematic diagram of torque flow when the inter-wheel torque distribution electric drive bridge with dual-motor torque coupling function described in the present invention works in the torque distribution motor independent drive mode.

[0030] Figure 4 It is a schematic diagram of torque flow when the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function described in the present invention works in the main drive motor-torque distribution motor torque coupling drive mode.

[0031] Figure 5 It is a schematic diagram of torque flow when the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function described in the present invention works in the main drive motor drive torque inter-wheel distribution mode. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0034] An embodiment of an inter-wheel torque distribution electric drive bridge with dual-motor torque coupling function described in the present invention is given below in conjunction with the accompanying drawings.

[0035] like Figure 1 As shown, the present invention provides an inter-wheel torque distribution electric drive axle, which mainly comprises a main drive motor (100), a main reducer (200), a differential (300), a right half shaft (400), a mode switching mechanism (500), an internal and external meshing double planetary gear mechanism (600), a cylindrical gear transmission mechanism (700), a torque distribution motor (800), and a left half shaft (900).

[0036] The main reducer (200) comprises: a first shaft (201), a first-stage reduction driving gear (202), a first-stage reduction driven gear (203), a second shaft (204), a second-stage reduction driving gear (205), and a second-stage reduction driven gear (206); the first shaft (201) is connected to the power output end of the main drive motor (100) via a spline, the first-stage reduction driving gear (202) is connected to the first shaft (201) via a flat key, the second-stage reduction driving gear (205) is connected to the second shaft (204) via a flat key, and the second-stage reduction driven gear (206) is fixedly connected to the housing of the differential (300). The mode switching mechanism (500) comprises: a spline hub (501), a right gear ring (502), a coupling sleeve (503), and a left gear ring (504). The internal and external meshing double planetary gear mechanism (600) comprises: a sun gear (601), a planetary gear 1 (602), a planetary shaft (603), a planetary gear 2 (604), a gear ring (605), and a planetary carrier (606). The sun gear (601) is connected to the power output shaft of the torque distribution motor (800) through a spline, the planetary gear 1 (602) is connected to the left end of the planetary shaft (603) through a flat key, and the planetary gear 2 (604) is connected to the right end of the planetary shaft (603) through a flat key. The cylindrical gear transmission mechanism (700) comprises: a driving cylindrical gear (701) and a driven cylindrical gear (702). The driving cylindrical gear (701) is fixedly connected to the planetary carrier (606), and the driven cylindrical gear (702) is connected to the second shaft (204) through a flat key. The torque distribution motor (800) is a hollow inner rotor motor, and its hollow shaft inner rotor is supported by an empty sleeve on the left half shaft (900). The spline hub (501) of the mode switching mechanism (500) is connected to the gear ring (605) via a spline, the left gear ring (504) is connected to the fixed end, and the right gear ring is connected to the left half shaft (900) via a flat key.

[0037] By controlling the output torque of the main drive motor (100) and the torque distribution motor (800) and the position of the coupling sleeve (503) of the mode switching mechanism (500), the invented inter-wheel torque distribution electric drive bridge with dual motor torque coupling function can realize four working modes: main drive motor independent drive mode, torque distribution motor independent drive mode, main drive motor-torque distribution motor torque coupling drive mode, and main drive motor drive torque inter-wheel distribution mode. In order to ensure that when the drive torque is distributed between wheels, the torque increase of the half shaft on the side with increased torque is equal to the torque decrease of the half shaft on the side with decreased torque, the number of teeth required for the cylindrical gear transmission mechanism (700) is: .

[0038] in, is the number of teeth of the driving cylindrical gear (701), is the number of teeth of the driven cylindrical gear (702), is the number of teeth of the secondary reduction driving gear (205), is the number of teeth of the secondary reduction driven gear (206), is a characteristic parameter of the internal and external meshing double planetary gear mechanism (600), The value is the multiplication of the tooth number ratio of the planetary gear 1 (602) to the sun gear (601) and the tooth number ratio of the ring gear (605) to the planetary gear 2 (604).

[0039] The working principle of the inter-wheel torque distribution electric drive bridge with dual-motor torque coupling function described in the present invention is further described in detail below in conjunction with the accompanying drawings.

[0040] like Figure 2 As shown, when the main drive motor (100) outputs torque, the torque distribution motor (800) does not output torque, and the coupling sleeve (503) is in the middle position, the inter-wheel torque distribution electric drive axle with dual motor torque coupling function operates in the main drive motor independent drive mode. At this time, the torque output by the main drive motor (100) is The torque is transmitted to the differential (300) in sequence through the first shaft (201) → the first reduction driving gear (202) → the first reduction driven gear (203) → the second shaft (204) → the second reduction driving gear (205) → the second reduction driven gear (206), and finally transmitted to the differential (300), and then evenly distributed to the left half shaft (900) and the right half shaft (400) by the differential (300), thereby driving the vehicle to travel. At this time, the torque output by the left half shaft (900) and the right half shaft 802 is ,in is the transmission ratio of the main reducer (200).

[0041] like Figure 3 As shown, when the main drive motor (100) does not output torque, the torque distribution motor (800) outputs torque, the coupling sleeve (503) is at the left end position, the spline hub (501) is connected to the left gear ring (504) through the coupling sleeve (503), and an inter-wheel torque distribution electric drive bridge with a dual-motor torque coupling function operates in a torque distribution motor independent drive mode, relying on the output torque of the torque distribution motor (800). The vehicle is driven independently. At this time, the torque output by the torque distribution motor (800) passes through the sun gear (601) → planetary gear 1 (602) → planetary shaft (603) → planetary carrier (606) → driving cylindrical gear (701) → driven cylindrical gear (702) → second shaft (204) → secondary reduction driving gear (205) → secondary reduction driven gear (206), and is finally transmitted to the differential (300), and is evenly distributed by the differential (300) to the left half shaft (900) and the right half shaft (400), thereby driving the vehicle. At this time, the torque output by the left half shaft (900) and the right half shaft 802 is .

[0042] like Figure 4 As shown, when the main drive motor (100) outputs torque and the torque distribution motor (800) outputs torque, the coupling sleeve (503) is at the left end position, the spline hub (501) is connected to the left gear ring (504) through the coupling sleeve (503), and an inter-wheel torque distribution electric drive bridge with dual-motor torque coupling function operates in the main drive motor-torque distribution motor torque coupling drive mode, relying on the output torque of the main drive motor (100) and the output torque of the torque distribution motor (800) to jointly drive the vehicle to travel. At this time, the torque output by the main drive motor (100) is The torque is transmitted sequentially through the first shaft (201) → the first reduction driving gear (202) → the first reduction driven gear (203) → the second shaft (204) → the second reduction driving gear (205) → the second reduction driven gear (206), and finally transmitted to the differential (300), and evenly distributed to the left half shaft (900) and the right half shaft (400) by the differential (300). The torque output by the torque distribution motor (800) It passes through the sun gear (601) → planetary gear 1 (602) → planetary carrier (606) → driving cylindrical gear (701) → driven cylindrical gear (702) → second shaft (204) → secondary reduction driving gear (205) → secondary reduction driven gear (206) in sequence, and is finally transmitted to the differential (300), and is evenly distributed to the left half shaft (900) and the right half shaft (400) by the differential (300). At this time, the torque output by the left half shaft (900) and the right half shaft 802 is .

[0043] like Figure 5As shown, when the main drive motor (100) outputs torque and the torque distribution motor (800) outputs torque, the coupling sleeve (503) is at the right end position, the spline hub (501) is connected to the right gear ring (502) through the coupling sleeve (503), and an inter-wheel torque distribution electric drive bridge with dual-motor torque coupling function operates in the main drive motor drive torque inter-wheel distribution mode, relying on the output torque of the main drive motor (100) to drive the vehicle, and relying on the output torque of the torque distribution motor (800) to transfer and distribute the output torque of the main drive motor (100) between the left half shaft (900) and the right half shaft (400). At this time, the torque output by the main drive motor (100) is The torque is transmitted sequentially through the first shaft (201) → the first reduction driving gear (202) → the first reduction driven gear (203) → the second shaft (204) → the second reduction driving gear (205) → the second reduction driven gear (206), and finally transmitted to the differential (300), and evenly distributed to the left half shaft (900) and the right half shaft (400) by the differential (300). The torque output by the torque distribution motor (800) After being transmitted to the planetary shaft (603) through the sun gear (601) and the planetary gear 1 (602), a part of the torque is transmitted to the left half shaft (900) through the planetary gear 2 (604) → the gear ring (605) → the spline hub (501) → the coupling sleeve (503) → the right gear ring (502), and a part of the torque is transmitted to the left half shaft (900) through the planetary carrier (606) → the driving cylindrical gear (701) → the driven cylindrical gear (702) → the second shaft (204) → the secondary reduction driving gear (205) → the secondary reduction driven gear (206), and finally transmitted to the differential (300), and evenly distributed to the left half shaft (900) and the right half shaft (400) by the differential (300). At this time, the driving torque of the left half shaft (900) is , the driving torque of the right half shaft (400) is .

[0044] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An inter-wheel torque distribution electric drive axle with dual motor torque coupling function, characterized in that: include: A main drive motor (100), a main reducer (200), a differential (300), a right half shaft (400), a mode switching mechanism (500), an internal and external meshing double planetary gear mechanism (600), a cylindrical gear transmission mechanism (700), a torque distribution motor (800), and a left half shaft (900); The main reducer (200) comprises: a first shaft (201), a primary reduction driving gear (202), a primary reduction driven gear (203), a second shaft (204), a secondary reduction driving gear (205), and a secondary reduction driven gear (206); the primary reduction driving gear (202) is externally meshed with the primary reduction driven gear (203); the secondary reduction driving gear (205) is externally meshed with the secondary reduction driven gear (206); the first shaft (201) is connected to the power output end of the main drive motor (100) via a spline; the primary reduction driving gear (202) is connected to the first shaft (201) via a flat key; the secondary reduction driving gear (205) is connected to the second shaft (204) via a flat key; and the secondary reduction driven gear (206) is fixedly connected to the housing of the differential (300); The mode switching mechanism (500) comprises: a spline hub (501), a right gear ring (502), a coupling sleeve (503), and a left gear ring (504); The internally and externally meshing double planetary gear mechanism (600) comprises: a sun gear (601), a planetary gear one (602), a planetary shaft (603), a planetary gear two (604), a ring gear (605), and a planet carrier (606); the sun gear (601) is connected to the power output shaft of the torque distribution motor (800) via a spline; the planetary gear one (602) is externally meshed with the sun gear (601); the planetary gear two (604) is internally meshed with the ring gear (605); the planetary gear one (602) is connected to the left end of the planetary shaft (603) via a flat key; and the planetary gear two (604) is connected to the right end of the planetary shaft (603) via a flat key; The cylindrical gear transmission mechanism (700) comprises: a driving cylindrical gear (701) and a driven cylindrical gear (702), the driving cylindrical gear (701) and the driven cylindrical gear (702) being externally meshed, the driving cylindrical gear (701) being fixedly connected to the planet carrier (606), and the driven cylindrical gear (702) being connected to the second shaft (204) via a flat key; The torque distribution motor (800) is a hollow inner rotor motor, and its hollow shaft inner rotor is supported by an empty sleeve on the left half shaft (900).

2. The inter-wheel torque distribution electric drive axle with dual motor torque coupling function as claimed in claim 1, characterized in that: The spline hub (501) of the mode switching mechanism (500) is connected to the gear ring (605) via a spline, the left gear ring (504) is connected to a fixed end, and the right gear ring (502) is connected to the left half shaft (900) via a flat key.

3. The inter-wheel torque distribution electric drive axle with dual motor torque coupling function as claimed in claim 1, characterized in that: By controlling the output torque of the main drive motor (100) and the torque distribution motor (800) and the position of the coupling sleeve (503) of the mode switching mechanism (500), four working modes can be realized, namely, a main drive motor independent drive mode, a torque distribution motor independent drive mode, a main drive motor-torque distribution motor torque coupling drive mode, and a main drive motor drive torque inter-wheel distribution mode; When the main drive motor (100) outputs torque and the torque distribution motor (800) does not output torque, the coupling sleeve (503) is located in a middle position, and at this time, the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function operates in a main drive motor independent drive mode, and the vehicle is independently driven by the output torque of the main drive motor (100); When the main drive motor (100) does not output torque, the torque distribution motor (800) outputs torque, and the coupling sleeve (503) is located at the left end position to connect the spline hub (501) with the left ring gear (504), at which time the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function operates in a torque distribution motor independent drive mode, and the vehicle is independently driven by the output torque of the torque distribution motor (800); When the main drive motor (100) outputs torque and the torque distribution motor (800) outputs torque, the coupling sleeve (503) is located at the left end position to connect the spline hub (501) with the left gear ring (504). At this time, the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function operates in a main drive motor-torque distribution motor torque coupling drive mode, and relies on the output torque of the main drive motor (100) and the output torque of the torque distribution motor (800) to jointly drive the vehicle to travel; When the main drive motor (100) outputs torque and the torque distribution motor (800) outputs torque, the coupling sleeve (503) is located at the right end position to connect the spline hub (501) with the right gear ring (502). At this time, the inter-wheel torque distribution electric drive axle with dual-motor torque coupling function operates in the main drive motor drive torque inter-wheel distribution mode, and the vehicle is driven by the output torque of the main drive motor (100), and the output torque of the torque distribution motor (800) is transferred and distributed between the left half shaft (900) and the right half shaft (400).

4. The inter-wheel torque distribution electric drive axle with dual motor torque coupling function as claimed in claim 1, characterized in that: In order to ensure that when the main drive motor driving torque is distributed among the wheels, the torque increase of the half shaft on the torque increase side is equal to the torque decrease of the half shaft on the torque decrease side, the number of teeth of the cylindrical gear transmission mechanism (700) is designed as follows: ; in, is the number of teeth of the driving cylindrical gear (701), is the number of teeth of the driven cylindrical gear (702), is the number of teeth of the secondary reduction driving gear (205), is the number of teeth of the secondary reduction driven gear (206), is a characteristic parameter of the internal and external meshing double planetary gear mechanism (600), The value is the multiplication of the tooth number ratio of the planetary gear 1 (602) to the sun gear (601) and the tooth number ratio of the ring gear (605) to the planetary gear 2 (604).

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