Double-motor electric drive axle assembly and vehicle

Abstract

The invention 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 present invention relates to the field of automobile transmission technology, and 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, and cannot achieve rapid adjustment and control of the vehicle. Summary of the invention

[0003] The purpose of the present invention 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 have a wide range of applicable scenarios.

[0004] To achieve the above object, the present invention 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, the planetary gear assembly comprising a plurality of planetary gears, an outer gear ring, a planetary support and a sun gear, the planetary support is provided with a plurality of connecting shafts protruding therefrom, the connecting shafts are arranged one-to-one with the planetary gears, the planetary gears are rotatably connected to the connecting shafts, and the planetary gears are meshed with the outer gear ring and the sun gear at the same time;

[0007] A left half shaft and a first driving motor, wherein the first driving motor is drivingly connected to the left half shaft and the planetary support and can simultaneously drive the left half shaft and the planetary support 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 connection between the outer gear ring and the right half shaft.

[0010] As a preferred technical solution of 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 gear ring and the output gear, and the output gear is fixedly connected to the right half shaft.

[0011] As a preferred technical solution of 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 a preferred technical solution of 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 a preferred technical solution of 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 a preferred technical solution of 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 via 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 present invention are:

[0020] The present invention provides a dual-motor electric drive axle assembly and a vehicle, the dual-motor electric drive axle assembly comprises: 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 comprises a plurality of planetary wheels, an outer gear ring, a planetary bracket and a sun gear, a plurality of connecting shafts are convexly provided on the planetary bracket, the plurality of connecting shafts are arranged one by one with the plurality of planetary wheels, the planetary wheels are rotatably connected to the connecting shafts, the planetary wheels are meshed with the outer gear ring and the sun gear at the same time, the first drive motor is transmission-connected to the left half shaft and the planetary bracket, and can simultaneously drive the left half shaft and the planetary bracket to rotate, the second drive motor is transmission-connected to the sun gear, and can drive the sun gear to rotate, and the transmission mechanism is transmission-connected between the outer gear ring and the right half shaft. In this way, when the wheel speed on one side of the first drive motor remains unchanged, the vehicle's motion switching between straight line, left turn and right turn can be realized only by controlling the speed of the second drive motor, and the turning radius of the vehicle can be accurately controlled, and even the left and right wheels can be reversed to complete the U-turn on the spot, the application scene range is wide, and the response speed is fast, which can effectively improve the flexibility and responsiveness of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

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

[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] Embodiments of the present invention are described in detail below, examples of which 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 be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0026] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Unless otherwise clearly specified and 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. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The technical solution of the present invention is 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 a plurality of planetary gears 1, an outer ring gear 2, a planetary bracket 3 and a sun gear 4, a plurality of connecting shafts 5 are convexly provided on the planetary bracket 3, and the plurality of connecting shafts 5 are arranged in a one-to-one correspondence with the plurality of planetary gears 1, the planetary gear 1 is rotatably connected to the connecting shaft 5, and the planetary gear 1 is meshed with the outer ring gear 2 and the sun gear 4 at the same time, the first drive motor 7 is transmission-connected to the left half shaft 6 and the planetary bracket 3, and can simultaneously drive the left half shaft 6 and the planetary bracket 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, and the transmission mechanism is transmission-connected between the outer ring gear 2 and the right half shaft 9. With such arrangement, while the wheel speed on one side of the first drive motor 7 remains unchanged, the vehicle's movement switching between straight driving, 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 flexibility and responsiveness of the vehicle.

[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 the rotation accuracy, the dual-motor electric drive axle assembly also includes a plurality of planetary bearings, which are arranged one by one with the plurality of planetary gears 1, and the inner ring of the planetary bearing is fixedly connected to the connecting shaft 5, and the outer ring of the planetary bearing is 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. The first drive motor 7 is connected to the first output shaft by transmission and can drive the first output shaft to rotate. The first output shaft is connected to the left half shaft 6 by a spline. The first drive motor 7 is connected to the second output shaft by transmission and can drive the second output shaft to rotate. The second output shaft is connected to the planetary bracket 3 by a spline. The first drive motor 7 is arranged between the left half shaft 6 and the planetary bracket 3, and the axis of the first output shaft coincides with the axis of the second output shaft. In this arrangement, the first drive motor 7 drives the left half shaft 6 and the planetary bracket 3 to rotate. They are connected to each other by splines and have the same speed, which ensures the stability of the transmission connection, and the structure is compact, effectively saving the layout space.

[0033] Optionally, 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, the third output shaft is connected to the sun gear 4 via 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, and outputs part of its power to the left half shaft 6, and the other part is output 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 bracket 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 bracket 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 on the spot, 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 achieve reverse rotation, thereby helping the vehicle to quickly turn or turn around on the spot.

[0041] When the left wheel loses adhesion and the right wheel has good adhesion, the first drive motor 7 drives the left wheel to idle at a speed n1, and also drives the planetary carrier 3 to rotate at a speed n1, and then transmits power to the right wheel through the outer gear ring 2 to help the vehicle get out of trouble. In addition to controlling the speed n1 of the first drive motor 7, the speed n2 of the outer gear ring 2 can also be further adjusted by controlling the speed n0 of the second drive motor 8, thereby adjusting the speed of the right wheel.

[0042] When the right wheel loses adhesion and the left wheel has good adhesion, the first drive motor 7 drives the left wheel to rotate 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 get out of trouble. At this time, if n0 does not rotate, the outer gear ring 2 will idle, that is, the right wheel will idle and slip. The speed n0 of the second drive motor 8 can also be controlled to prevent the outer gear ring 2 from rotating, that is, the right wheel from rotating, to avoid 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 clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dual-motor electric drive axle assembly, characterized in that: include: A planetary gear assembly, the planetary gear assembly comprising a plurality of planetary gears (1), an outer gear ring (2), a planetary support (3) and a sun gear (4), the planetary support (3) being provided with a plurality of connecting shafts (5), the plurality of connecting shafts (5) being arranged in a one-to-one correspondence with the plurality of planetary gears (1), the planetary gears (1) being rotatably connected to the connecting shafts (5), and the planetary gears (1) being meshed with the outer gear ring (2) and the sun gear (4) at the same time; A left half shaft (6) and a first drive motor (7), wherein the first drive motor (7) is drivingly connected to the left half shaft (6) and the planetary support (3), and can simultaneously drive 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 transmission 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 also includes a plurality of planetary bearings, which 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 drivingly 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: It 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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