Double-motor electric drive axle assembly and vehicle

Abstract

The utility model relates to the technical field of automobile transmission, and particularly discloses a double-motor electric drive axle assembly and a vehicle. A plurality of connecting shafts are arranged on a planet support in a protruding mode and correspond to a plurality of planet gears in a one-to-one mode, the planet gears are rotationally connected to the connecting shafts, and the planet gears are meshed with an outer gear ring and a sun gear at the same time; the first driving motor is in transmission connection with the left half shaft and the planet support and can drive the left half shaft and the planet support to rotate, the second driving motor is in transmission connection with the sun gear and can drive the sun gear to rotate, and the transmission mechanism is in transmission connection between the outer gear ring and the right half shaft. Under the condition that the rotating speed of the wheels on one side of the first driving motor is kept unchanged, switching among straight line, left turning and right turning of the vehicle can be achieved only by controlling the rotating speed of the second driving motor, the turning radius of the vehicle is accurately controlled, even left and right wheels can be reversely rotated, in-situ turning is completed, the application scene range is wide, the response speed is high, and the driving reliability is high. And the flexibility of the vehicle is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile transmission, in particular to a dual-motor electric drive axle assembly and a vehicle. Background Art

[0002] The automobile drive axle is a mechanism located at the end of the transmission system that can change the speed and torque from the transmission and transmit them to the drive wheels. The traditional drive axle transmits power through mechanical devices. It adopts a centralized structure and distributes power to the left and right wheels through the main reducer and differential. Although the differential can allow the left and right wheels to have different speeds, the differential is passive, with a small range of applicable scenarios and slow response speed, which cannot achieve rapid adjustment and control of the vehicle. Utility Model Content

[0003] The purpose of the utility model is to provide a dual-motor electric drive axle assembly and a vehicle, which can improve the flexibility and response speed of the vehicle and has a wide range of applicable scenarios.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] In one aspect, the present invention provides a dual-motor electric drive axle assembly, comprising:

[0006] A planetary gear assembly comprising a plurality of planetary gears, an outer ring gear, a planetary carrier, and a sun gear. The planetary carrier is provided with a plurality of connecting shafts protruding therefrom. The connecting shafts are arranged in a one-to-one correspondence with the planetary gears. The planetary gears are rotatably connected to the connecting shafts and mesh with the outer ring gear and the sun gear at the same time.

[0007] A left half shaft and a first drive motor, wherein the first drive motor is transmission-connected to the left half shaft and the planetary carrier, and can simultaneously drive the left half shaft and the planetary carrier to rotate;

[0008] a second drive motor, the second drive motor being transmission-connected to the sun gear and capable of driving the sun gear to rotate;

[0009] The right half shaft and the transmission mechanism are connected in transmission between the outer gear ring and the right half shaft.

[0010] As an optimal technical solution for the above-mentioned dual-motor electric drive axle assembly, the transmission mechanism includes a transmission gear assembly and an output gear. The transmission gear assembly is transmission-connected between the outer ring gear and the output gear, and the output gear is fixedly connected to the right half shaft.

[0011] As an optimal technical solution for the above-mentioned dual-motor electric drive axle assembly, the dual-motor electric drive axle assembly also includes a plurality of planetary bearings, and the plurality of planetary bearings are arranged in a one-to-one correspondence with the plurality of planetary gears, and the inner ring of the planetary bearing is fixedly connected to the connecting shaft, and the outer ring of the planetary bearing is fixedly connected to the planetary gear.

[0012] As an optimal technical solution for the above-mentioned dual-motor electric drive axle assembly, the dual-motor electric drive axle assembly also includes a first output shaft, the first drive motor is transmission-connected to the first output shaft and can drive the first output shaft to rotate, and the first output shaft is connected to the left half shaft through a spline.

[0013] As an optimal technical solution for the above-mentioned dual-motor electric drive axle assembly, the dual-motor electric drive axle assembly also includes a second output shaft, the first drive motor is transmission-connected to the second output shaft and can drive the second output shaft to rotate, and the second output shaft is connected to the planetary bracket through a spline.

[0014] As a preferred technical solution of the above-mentioned dual-motor electric drive axle assembly, the first drive motor is arranged between the left half shaft and the planetary carrier.

[0015] As a preferred technical solution of the above-mentioned dual-motor electric drive axle assembly, the axis of the first output shaft coincides with the axis of the second output shaft.

[0016] As an optimal technical solution for the above-mentioned dual-motor electric drive axle assembly, the dual-motor electric drive axle assembly also includes a third output shaft, the second drive motor is transmission-connected to the third output shaft and can drive the third output shaft to rotate, and the third output shaft is connected to the sun gear through a spline.

[0017] As a preferred technical solution of the above-mentioned dual-motor electric drive axle assembly, the second drive motor is arranged between the right half shaft and the sun gear, and the axis of the third output shaft coincides with the axis of the right half shaft.

[0018] On the other hand, the present invention also provides a vehicle comprising a left drive wheel, a right drive wheel and a dual-motor electric drive axle assembly in any of the above schemes, wherein the left drive wheel is connected to the left half-shaft, and the right drive wheel is connected to the right half-shaft.

[0019] The beneficial effects of the utility model are:

[0020] The utility model provides a dual-motor electric drive axle assembly and a vehicle, the dual-motor electric drive axle assembly comprising: a planetary gear assembly, a left half-shaft, a first drive motor, a second drive motor, a right half-shaft, and a transmission mechanism, the planetary gear assembly comprising a plurality of planetary gears, an outer ring gear, a planetary carrier, and a sun gear, the planetary carrier being provided with a plurality of connecting shafts protruding therefrom, the plurality of connecting shafts being arranged one-to-one with the plurality of planetary gears, the planetary gears being rotatably connected to the connecting shafts, the planetary gears being meshed with the outer ring gear and the sun gear, the first drive motor being transmission-connected to the left half-shaft and the planetary carrier and capable of simultaneously driving the left half-shaft and the planetary carrier to rotate, the second drive motor being transmission-connected to the sun gear and capable of driving the sun gear to rotate, and the transmission mechanism being transmission-connected between the outer ring gear and the right half-shaft. In this arrangement, while the wheel speed on one side of the first drive motor remains constant, the vehicle can switch between straight-line, left-turn, and right-turn motions by simply controlling the speed of the second drive motor, and the vehicle's turning radius can be precisely controlled, and even left and right wheel reversal can be achieved to complete a U-turn on the spot, thereby having a wide range of applications and a fast response speed, effectively improving the vehicle's flexibility and responsiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of the dual-motor electric drive axle assembly provided by the utility model.

[0022] in:

[0023] 1. Planetary gear; 2. Outer ring gear; 3. Planetary carrier; 4. Sun gear; 5. Connecting shaft; 6. Left half shaft; 7. First drive motor; 8. Second drive motor; 9. Right half shaft; 10. Transmission gear assembly; 11. Output gear. DETAILED DESCRIPTION

[0024] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0026] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0027] Unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0029] like Figure 1 As shown, this embodiment provides a dual-motor electric drive axle assembly, which includes: a planetary gear assembly, a left half shaft 6, a first drive motor 7, a second drive motor 8, a right half shaft 9 and a transmission mechanism. The planetary gear assembly includes several planetary gears 1, an outer ring gear 2, a planetary carrier 3 and a sun gear 4. Several connecting shafts 5 are protruding from the planetary carrier 3. The several connecting shafts 5 are arranged in a one-to-one correspondence with the several planetary gears 1. The planetary gears 1 are rotatably connected to the connecting shafts 5. The planetary gears 1 are simultaneously engaged with the outer ring gear 2 and the sun gear 4. The first drive motor 7 is transmission-connected to the left half shaft 6 and the planetary carrier 3, and can simultaneously drive the left half shaft 6 and the planetary carrier 3 to rotate. The second drive motor 8 is transmission-connected to the sun gear 4 and can drive the sun gear 4 to rotate. The transmission mechanism is transmission-connected between the outer ring gear 2 and the right half shaft 9. With this arrangement, while the wheel speed on one side of the first drive motor 7 remains unchanged, the vehicle's movement switching between straight-line, left turn, and right turn can be achieved only by controlling the speed of the second drive motor 8, and the turning radius of the vehicle can be accurately controlled, and even the left and right wheels can be reversed to complete a U-turn on the spot. It has a wide range of applicable scenarios and a fast response speed, which can effectively improve the vehicle's flexibility and responsiveness.

[0030] Furthermore, the transmission mechanism includes a transmission gear assembly 10 and an output gear 11 . The transmission gear assembly 10 is transmission-connected between the outer gear ring 2 and the output gear 11 . The output gear 11 is fixedly connected to the right half shaft 9 .

[0031] Optionally, in order to support the rotation of the planetary gear 1, reduce the friction coefficient during its movement, and ensure rotation accuracy, the dual-motor electric drive axle assembly further includes a plurality of planetary bearings, which are arranged in a one-to-one correspondence with the plurality of planetary gears 1, with the inner rings of the planetary bearings fixedly connected to the connecting shaft 5 and the outer rings of the planetary bearings fixedly connected to the planetary gear 1.

[0032] In this embodiment, the dual-motor electric drive axle assembly also includes a first output shaft and a second output shaft. A first drive motor 7 is transmission-connected to the first output shaft and is capable of driving the first output shaft in rotation. The first output shaft is spline-connected to the left half-shaft 6. The first drive motor 7 is transmission-connected to the second output shaft and is capable of driving the second output shaft in rotation. The second output shaft is spline-connected to the planetary carrier 3. The first drive motor 7 is positioned between the left half-shaft 6 and the planetary carrier 3, with the axis of the first output shaft coinciding with the axis of the second output shaft. This arrangement allows the first drive motor 7 to rotate the left half-shaft 6 and the planetary carrier 3, which are spline-connected to each other at the same speed, ensuring a stable transmission connection and a compact structure, effectively saving layout space.

[0033] Optionally, the dual-motor electric drive axle assembly also includes a third output shaft, the second drive motor 8 is connected to the third output shaft, and can drive the third output shaft to rotate, the third output shaft is connected to the sun gear 4 through a spline, the second drive motor 8 is arranged between the right half shaft 9 and the sun gear 4, and the axis of the third output shaft coincides with the axis of the right half shaft 9.

[0034] The working principle of the dual-motor electric drive axle assembly provided in this embodiment is further explained below.

[0035] Specifically, the second drive motor 8 is connected to the sun gear 4, and its main function is to adjust the speed difference between the left and right wheels. The first drive motor 7 with higher power is connected to the planetary bracket 3 and the left half shaft 6, and its main function is to drive, outputting part of its power to the left half shaft 6 and the other part to the right half shaft 9 through the planetary gear assembly.

[0036] For ease of description and understanding, the speed of the second drive motor 8 is set to n0, the speed of the first drive motor 7 is set to n1, and the speed of the outer ring gear 2 is set to n2; at the same time, the transmission ratio of the transmission gear assembly 10 is set to 1:1, that is, the outer ring gear 2 and the output gear 11 have the same speed.

[0037] When the vehicle is traveling in a straight line, the first drive motor 7 drives the left half shaft 6 and the planetary carrier 3 to rotate at the same speed at a speed n1, and the second drive motor 8 drives the sun gear 4 to rotate at a speed n0. Since the left wheel speed and the right wheel speed need to be the same when traveling in a straight line, the speed n0 of the second drive motor 8 is adjusted so that n0 = n1. At this time, the planetary carrier 3 and the sun gear 4 have the same speed, the planetary gear 1 does not rotate, and the outer ring gear 2 has the same speed, that is, n0 = n1 = n2, thereby driving the right half shaft 9 to rotate at a constant speed.

[0038] When the vehicle turns left, the left wheel speed needs to be smaller than the right wheel speed, and the speed of the second drive motor 8 is adjusted so that n0 is smaller than n1. At this time, the speed n1 of the planetary carrier 3 is smaller than the speed n2 of the outer ring gear 2, that is, the left wheel speed is smaller than the right wheel speed. The slower the speed n0 of the second drive motor 8, the greater the speed difference between the left and right wheels, and the greater the left turn angle of the vehicle. The turning radius of the vehicle can be controlled only by controlling the speed n0 of the second drive motor 8.

[0039] When the vehicle turns right, the left wheel speed needs to be greater than the right wheel speed, and the speed n0 of the second drive motor 8 is adjusted to be greater than n1. At this time, the speed n1 of the planetary carrier 3 is greater than the speed n2 of the outer ring gear 2, that is, the left wheel speed is greater than the right wheel speed. The faster the speed n0 of the second drive motor 8, the greater the speed difference between the left and right wheels, and the greater the right turn angle of the vehicle. The turning radius of the vehicle can be controlled only by controlling the speed n0 of the second drive motor 8.

[0040] When the vehicle needs to make a sharp turn or turn around in place, the speed n0 of the second drive motor 8 is changed to increase the speed difference between it and the speed n1 of the first drive motor 7, or even to achieve reverse rotation, thereby helping the vehicle to quickly turn or turn around in place.

[0041] When the left wheel loses traction while the right wheel maintains good traction, the first drive motor 7 spins the left wheel at n1, simultaneously driving the planetary carrier 3 to rotate at n1. This power is then transferred to the right wheel via the outer ring gear 2, helping the vehicle escape. In addition to controlling the speed n1 of the first drive motor 7, the speed n2 of the outer ring gear 2, and thus the speed of the right wheel, can also be adjusted by controlling the speed n0 of the second drive motor 8.

[0042] When the right wheel loses traction while the left wheel has good traction, the first drive motor 7 rotates the left wheel at a speed n1. By controlling the first drive motor 7, the speed and torque of the left wheel are adjusted to help the vehicle escape. At this time, if n0 does not rotate, the outer ring gear 2 will idle, that is, the right wheel will idle and slip. Alternatively, by controlling the speed n0 of the second drive motor 8, the outer ring gear 2 and the right wheel will not rotate, thus preventing tire wear.

[0043] This embodiment also provides a vehicle, including a left drive wheel, a right drive wheel and the dual-motor electric drive axle assembly in the above scheme, the left drive wheel is connected to the left half shaft 6, and the right drive wheel is connected to the right half shaft 9.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A dual-motor electric drive axle assembly, characterized in that: include: A planetary gear assembly, comprising a plurality of planetary gears (1), an outer ring gear (2), a planetary support (3) and a sun gear (4); a plurality of connecting shafts (5) are protruding from the planetary support (3); the plurality of connecting shafts (5) are arranged in a one-to-one correspondence with the plurality of planetary gears (1); the planetary gears (1) are rotatably connected to the connecting shafts (5); and the planetary gears (1) are simultaneously meshed with the outer ring gear (2) and the sun gear (4); A left half shaft (6) and a first drive motor (7), wherein the first drive motor (7) is transmission-connected to the left half shaft (6) and the planetary support (3), and is capable of simultaneously driving the left half shaft (6) and the planetary support (3) to rotate; a second drive motor (8), the second drive motor (8) being transmission-connected to the sun gear (4) and capable of driving the sun gear (4) to rotate; The right half shaft (9) and the transmission mechanism are connected in a transmission manner between the outer gear ring (2) and the right half shaft (9).

2. The dual-motor electric drive axle assembly according to claim 1, characterized in that: The transmission mechanism comprises a transmission gear assembly (10) and an output gear (11); the transmission gear assembly (10) is transmission-connected between the outer gear ring (2) and the output gear (11); and the output gear (11) is fixedly connected to the right half shaft (9).

3. The dual-motor electric drive axle assembly according to claim 1, characterized in that: The dual-motor electric drive axle assembly further includes a plurality of planetary bearings, wherein the plurality of planetary bearings are arranged in a one-to-one correspondence with the plurality of planetary wheels (1), and the inner rings of the planetary bearings are fixedly connected to the connecting shaft (5), and the outer rings of the planetary bearings are fixedly connected to the planetary wheels (1).

4. The dual-motor electric drive axle assembly according to claim 1, characterized in that: The dual-motor electric drive axle assembly also includes a first output shaft, the first drive motor (7) is transmission-connected to the first output shaft and can drive the first output shaft to rotate, and the first output shaft is connected to the left half shaft (6) via a spline.

5. The dual-motor electric drive axle assembly according to claim 4, characterized in that: The dual-motor electric drive axle assembly also includes a second output shaft, the first drive motor (7) is transmission-connected to the second output shaft and can drive the second output shaft to rotate, and the second output shaft is connected to the planetary support (3) via a spline.

6. The dual-motor electric drive axle assembly according to claim 5, characterized in that: The first drive motor (7) is arranged between the left half shaft (6) and the planetary support (3).

7. The dual-motor electric drive axle assembly according to claim 5, characterized in that: An axis of the first output shaft coincides with an axis of the second output shaft.

8. The dual-motor electric drive axle assembly according to claim 1, characterized in that: The dual-motor electric drive axle assembly also includes a third output shaft, the second drive motor (8) is transmission-connected to the third output shaft and can drive the third output shaft to rotate, and the third output shaft is connected to the sun gear (4) via a spline.

9. The dual-motor electric drive axle assembly according to claim 8, characterized in that: The second drive motor (8) is arranged between the right half shaft (9) and the sun gear (4), and the axis of the third output shaft coincides with the axis of the right half shaft (9).

10. A vehicle, characterized in that: The invention comprises a left drive wheel, a right drive wheel and a dual-motor electric drive axle assembly as described in any one of claims 1 to 9, wherein the left drive wheel is connected to the left half-shaft (6), and the right drive wheel is connected to the right half-shaft (9).

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