Multi-motor composite electric drive axle

Abstract

This invention belongs to the field of vehicle electric drive technology, specifically relating to a multi-motor composite electric drive axle. The multi-motor composite electric drive axle includes: four drive motors, three clutches, three planetary gear sets, and two output half-shafts. Compared with existing technologies, this invention provides a multi-motor composite electric drive axle without differential locks or shifting mechanisms, featuring a simple structure and ease of engineering. It places the planetary gear sets within the internal space where the main and auxiliary motors are opposite, resulting in a compact structure and wide applicability to various vehicle models. Through three motor drive state control modes, it can switch between three operating modes: independent drive of the main drive motor, independent drive of the auxiliary drive motor, and composite drive of the main and auxiliary drive motors. The drive motors operate in the high-efficiency range for extended periods, resulting in high efficiency for the composite electric drive axle.

Description

Technical Field

[0001] This invention belongs to the field of vehicle electric drive technology, and specifically relates to a multi-motor composite electric drive axle. Background Technology

[0002] Electric drive axles are used to reduce the speed and increase the torque of motors, transmitting this torque to wheel-side reducers or directly to the drive wheels, while simultaneously providing the inter-wheel differential function required for steering. Current coaxial electric drive axle products mostly employ strong coupling between single or dual motors, single gear, electronic differential, or locking differential, which is insufficient to meet the needs of high-power vehicle applications. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] The technical problem to be solved by this invention is: how to provide a multi-motor composite electric drive bridge that can realize multi-motor composite drive, three working modes, compact structure, and integrated speed change and differential.

[0005] (II) Technical Solution

[0006] To solve the above-mentioned technical problems, the present invention provides a multi-motor composite electric drive axle, which includes: four drive motors, three clutches, three planetary gear sets, and two output half-shafts;

[0007] The four drive motors are divided into two main drive motors and two auxiliary drive motors.

[0008] The two main drive motors are the first main drive motor 1 and the second main drive motor 3, respectively.

[0009] The two auxiliary drive motors are the first auxiliary drive motor 16 and the second auxiliary drive motor 13, respectively.

[0010] The three planetary gear sets are: the first planetary gear set that acts as a differential, the second planetary gear set that acts as a deceleration unit, and the third planetary gear set that acts as a deceleration unit.

[0011] The first planetary gear set includes: a first planet carrier 5, a first sun gear 15, a second sun gear 10, and a plurality of first planet gears 6 and second planet gears 14; the plurality of first planet gears 6 and second planet gears 14 mesh with each other and are all supported on the first planet carrier 5, and respectively mesh with the first sun gear 15 and the second sun gear 10;

[0012] The second planetary gear set includes: a second planetary carrier 18, a first ring gear 20, a third sun gear 21, and a plurality of third planet gears 19; the plurality of third planet gears 19 are supported on the second planetary carrier 18 and simultaneously mesh with the third sun gear 21 and the first ring gear 20.

[0013] The third planetary gear set includes: a third planetary carrier 9, a second gear ring 7, a fourth sun gear 12, and a plurality of fourth planetary gears 8; the plurality of fourth planetary gears 8 are supported on the third planetary carrier 9 and simultaneously mesh with the fourth sun gear 12 and the second gear ring 7;

[0014] The input component 2 is connected to both the first main drive motor 1 and the second main drive motor 3. The input component 2, the transmission component 4, and the first planetary carrier 5 are all gear shafts. The transmission component 4 serves as an intermediate shaft. The three components transmit power through gear meshing.

[0015] The first auxiliary drive motor 16 is connected to the third sun gear 18;

[0016] The second auxiliary drive motor 13 is connected to the fourth sun gear 12;

[0017] The first output shaft 17 is connected to the second planetary carrier 19;

[0018] The second output shaft 11 is connected to the third planetary carrier 9;

[0019] The first gear ring 21 is fixed;

[0020] The second gear ring 7 is fixed.

[0021] The power of the first main drive motor 1 and the second main drive motor 3 is transmitted to the first output half shaft 17 and the second output half shaft 11 via the input component 2, the transmission component 4 and the first planetary gear set.

[0022] The first auxiliary drive motor 16 transmits power to the first output half-shaft 17 through the second planetary gear set, and merges with the power transmitted by the first main drive motor 1 and the second main drive motor 3.

[0023] The second auxiliary drive motor 13 transmits power to the second output half-shaft 11 through the third planetary gear set, and merges with the power transmitted by the first main drive motor 1 and the second main drive motor 3.

[0024] Here, the ratio of the number of teeth of the first planetary carrier 5 to the number of teeth of the transmission component 4 is defined as K1, and the ratio of the number of teeth of the transmission component 4 to the number of teeth of the input component 2 is defined as K2, and the product of the two is K1xK2=4.

[0025] Among them, the first planetary gear 6 and the second planetary gear 14 have the same number of teeth; the tooth ratio of the first sun gear 15 to the second sun gear 10 is K3 = 1; the tooth ratio of the first gear ring 21 to the third sun gear 18 is K4 = 3; and the tooth ratio of the second gear ring 7 to the fourth sun gear 12 is K5 = 3.

[0026] The multi-motor composite electric drive bridge is used to achieve three working modes, namely:

[0027] When the first main drive motor 1 and the second main drive motor 3 work synchronously, the first auxiliary drive motor 16 and the second auxiliary drive motor 13 do not work, which is the independent drive mode of the main drive motors:

[0028] When the first auxiliary drive motor 16 and the second auxiliary drive motor 13 are driven independently, the first main drive motor 1 and the second main drive motor 3 are not working, which is the independent drive mode of the auxiliary drive motors:

[0029] When the first main drive motor 1 and the second main drive motor 3 work synchronously, the first auxiliary drive motor 16 and the second auxiliary drive motor 13 provide auxiliary drive, which is a combined drive working mode of main and auxiliary drive motors.

[0030] In the independent drive mode of the main drive motor:

[0031] The power from the first main drive motor 1 and the second main drive motor 3 is sequentially output to the first output shaft 17 and the second output shaft 11 via the input component 2, the transmission component 4 and the first planetary gear set. This working mode is used for normal vehicle operation.

[0032] In the independent drive mode of the auxiliary drive motor:

[0033] The power of the first auxiliary drive motor 16 and the second auxiliary drive motor 13 is transmitted to the first output shaft 17 and the second output shaft 11 via the second planetary gear set and the third planetary gear set, respectively; this working mode is used for vehicle small-radius steering and getting out of trouble on complex road surfaces.

[0034] Wherein, the main and auxiliary drive motors are driven in a combined manner:

[0035] The power of the first main drive motor 1 and the second main drive motor 3 is transmitted to the first output shaft 17 and the second output shaft 11 via the input component 2, the transmission component 4 and the first planetary gear set;

[0036] The first auxiliary drive motor 16 transmits power to the first output half-shaft 17 through the second planetary gear set, and merges with the power transmitted by the first main drive motor 1 and the second main drive motor 3.

[0037] The second auxiliary drive motor 13 transmits power to the second output half shaft 11 through the third planetary gear set, and merges with the power transmitted by the first main drive motor 1 and the second main drive motor 3;

[0038] This operating mode is for vehicles traveling on difficult roads and slopes.

[0039] (III) Beneficial Effects

[0040] Compared with existing technologies, this invention provides a multi-motor composite electric drive axle that has no differential lock or shifting mechanism, has a simple structure, and is easy to engineer. It places the planetary gear set in the internal space where the main and auxiliary motors are opposite each other, resulting in a compact structure and wide applicability to various vehicle models. It can switch between three working modes—independent drive of the main drive motor, independent drive of the auxiliary drive motor, and composite drive of the main and auxiliary drive motors—through three motor drive state control. The drive motors operate in the high-efficiency range for a long time, resulting in high efficiency of the composite electric drive axle. Attached Figure Description

[0041] Figure 1 Here is a simplified diagram of the transmission mechanism of this invention:

[0042] Among them, 1-first main drive motor, 2-input component, 3-second main drive motor, 4-transmission component, 5-first planetary carrier, 6-first planetary gear, 7-second ring gear, 8-fourth planetary gear, 9-third planetary carrier, 10-second sun gear, 11-second output shaft, 12-fourth sun gear, 13-second auxiliary drive motor, 14-second planetary gear, 15-first sun gear, 16-first auxiliary drive motor, 17-first output shaft, 18-third sun gear, 19-second planetary carrier, 20-third planetary gear, 21-first ring gear. Detailed Implementation

[0043] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0044] To solve the above-mentioned technical problems, the present invention provides a multi-motor composite electric drive bridge, which is a multi-motor composite electric drive bridge that can realize multi-motor composite drive, three working modes, compact structure, and speed change and differential integration.

[0045] like Figure 1 As shown, the multi-motor composite electric drive axle includes: four drive motors, three clutches, three planetary gear sets, and two output half-shafts;

[0046] The four drive motors are divided into two main drive motors and two auxiliary drive motors.

[0047] The two main drive motors are the first main drive motor 1 and the second main drive motor 3, respectively.

[0048] The two auxiliary drive motors are the first auxiliary drive motor 16 and the second auxiliary drive motor 13, respectively.

[0049] The three planetary gear sets are: the first planetary gear set that acts as a differential, the second planetary gear set that acts as a deceleration unit, and the third planetary gear set that acts as a deceleration unit.

[0050] The first planetary gear set includes: a first planet carrier 5, a first sun gear 15, a second sun gear 10, and a plurality of first planet gears 6 and second planet gears 14; the plurality of first planet gears 6 and second planet gears 14 mesh with each other and are all supported on the first planet carrier 5, and respectively mesh with the first sun gear 15 and the second sun gear 10;

[0051] The second planetary gear set includes: a second planetary carrier 18, a first ring gear 20, a third sun gear 21, and a plurality of third planet gears 19; the plurality of third planet gears 19 are supported on the second planetary carrier 18 and simultaneously mesh with the third sun gear 21 and the first ring gear 20.

[0052] The third planetary gear set includes: a third planetary carrier 9, a second gear ring 7, a fourth sun gear 12, and a plurality of fourth planetary gears 8; the plurality of fourth planetary gears 8 are supported on the third planetary carrier 9 and simultaneously mesh with the fourth sun gear 12 and the second gear ring 7;

[0053] The input component 2 is connected to both the first main drive motor 1 and the second main drive motor 3. The input component 2, the transmission component 4, and the first planetary carrier 5 are all gear shafts. The transmission component 4 serves as an intermediate shaft. The three components transmit power through gear meshing.

[0054] The first auxiliary drive motor 16 is connected to the third sun gear 18;

[0055] The second auxiliary drive motor 13 is connected to the fourth sun gear 12;

[0056] The first output shaft 17 is connected to the second planetary carrier 19;

[0057] The second output shaft 11 is connected to the third planetary carrier 9;

[0058] The first gear ring 21 is fixed;

[0059] The second gear ring 7 is fixed.

[0060] The power of the first main drive motor 1 and the second main drive motor 3 is transmitted to the first output half shaft 17 and the second output half shaft 11 via the input component 2, the transmission component 4 and the first planetary gear set.

[0061] The first auxiliary drive motor 16 transmits power to the first output half-shaft 17 through the second planetary gear set, and merges with the power transmitted by the first main drive motor 1 and the second main drive motor 3.

[0062] The second auxiliary drive motor 13 transmits power to the second output half-shaft 11 through the third planetary gear set, and merges with the power transmitted by the first main drive motor 1 and the second main drive motor 3.

[0063] Here, the ratio of the number of teeth of the first planetary carrier 5 to the number of teeth of the transmission component 4 is defined as K1, and the ratio of the number of teeth of the transmission component 4 to the number of teeth of the input component 2 is defined as K2, and the product of the two is K1xK2=4.

[0064] Among them, the first planetary gear 6 and the second planetary gear 14 have the same number of teeth; the tooth ratio of the first sun gear 15 to the second sun gear 10 is K3 = 1; the tooth ratio of the first gear ring 21 to the third sun gear 18 is K4 = 3; and the tooth ratio of the second gear ring 7 to the fourth sun gear 12 is K5 = 3.

[0065] The multi-motor composite electric drive bridge is used to achieve three working modes, namely:

[0066] When the first main drive motor 1 and the second main drive motor 3 work synchronously, the first auxiliary drive motor 16 and the second auxiliary drive motor 13 do not work, which is the independent drive mode of the main drive motors:

[0067] When the first auxiliary drive motor 16 and the second auxiliary drive motor 13 are driven independently, the first main drive motor 1 and the second main drive motor 3 are not working, which is the independent drive mode of the auxiliary drive motors:

[0068] When the first main drive motor 1 and the second main drive motor 3 work synchronously, the first auxiliary drive motor 16 and the second auxiliary drive motor 13 provide auxiliary drive, which is a combined drive working mode of main and auxiliary drive motors.

[0069] In the independent drive mode of the main drive motor:

[0070] The power from the first main drive motor 1 and the second main drive motor 3 is sequentially output to the first output shaft 17 and the second output shaft 11 via the input component 2, the transmission component 4 and the first planetary gear set. This working mode is used for normal vehicle operation.

[0071] In the independent drive mode of the auxiliary drive motor:

[0072] The power of the first auxiliary drive motor 16 and the second auxiliary drive motor 13 is transmitted to the first output shaft 17 and the second output shaft 11 via the second planetary gear set and the third planetary gear set, respectively; this working mode is used for vehicle small-radius steering and getting out of trouble on complex road surfaces.

[0073] Wherein, the main and auxiliary drive motors are driven in a combined manner:

[0074] The power of the first main drive motor 1 and the second main drive motor 3 is transmitted to the first output shaft 17 and the second output shaft 11 via the input component 2, the transmission component 4 and the first planetary gear set;

[0075] The first auxiliary drive motor 16 transmits power to the first output half-shaft 17 through the second planetary gear set, and merges with the power transmitted by the first main drive motor 1 and the second main drive motor 3.

[0076] The second auxiliary drive motor 13 transmits power to the second output half shaft 11 through the third planetary gear set, and merges with the power transmitted by the first main drive motor 1 and the second main drive motor 3;

[0077] This operating mode is for vehicles traveling on difficult roads and slopes.

[0078] In general, the number of the first planetary gear 6, the third planetary gear 20, and the fourth planetary gear 8 is 3-4.

[0079] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-motor composite electric drive axle, characterized in that, The multi-motor composite electric drive axle includes: four drive motors, three clutches, three planetary gear sets, and two output half-shafts; The four drive motors are divided into two main drive motors and two auxiliary drive motors. The two main drive motors are the first main drive motor (1) and the second main drive motor (3). The two auxiliary drive motors are the first auxiliary drive motor (16) and the second auxiliary drive motor (13). The three planetary gear sets are: the first planetary gear set that acts as a differential, the second planetary gear set that acts as a deceleration unit, and the third planetary gear set that acts as a deceleration unit. The first planetary gear set includes: a first planet carrier (5), a first sun gear (15), a second sun gear (10), and a plurality of first planet gears (6) and second planet gears (14); the plurality of first planet gears (6) and second planet gears (14) mesh with each other and are all supported on the first planet carrier (5), and mesh with the first sun gear (15) and the second sun gear (10) respectively; The second planetary gear set includes: a second planetary carrier (18), a first gear ring (20), a third sun gear (21), and a plurality of third planetary gears (19); the plurality of third planetary gears (19) are supported on the second planetary carrier (18) and simultaneously mesh with the third sun gear (21) and the first gear ring (20); The third planetary gear set includes: a third planetary carrier (9), a second gear ring (7), a fourth sun gear (12), and a plurality of fourth planetary gears (8); the plurality of fourth planetary gears (8) are supported on the third planetary carrier (9) and simultaneously mesh with the fourth sun gear (12) and the second gear ring (7); The input component (2) is connected to both the first main drive motor (1) and the second main drive motor (3). The input component (2), the transmission component (4), and the first planetary carrier (5) are all gear shafts. The transmission component (4) serves as an intermediate shaft. The three components transmit power through gear meshing. The first auxiliary drive motor (16) is connected to the third sun gear (21); The second auxiliary drive motor (13) is connected to the fourth sun gear (12); The first output shaft (17) is connected to the second planetary carrier (18); The second output shaft (11) is connected to the third planetary carrier (9); The first gear ring (20) is fixed; The second gear ring (7) is fixed.

2. The multi-motor composite electric drive axle of claim 1, wherein, The power of the first main drive motor (1) and the second main drive motor (3) is transmitted to the first output shaft (17) and the second output shaft (11) via the input component (2), the transmission component (4) and the first planetary gear set.

3. The multi-motor complex electric drive axle of claim 2, wherein, The first auxiliary drive motor (16) transmits power to the first output shaft (17) through the second planetary gear set, and merges with the power transmitted by the first main drive motor (1) and the second main drive motor (3).

4. The multi-motor complex electric drive axle of claim 3, wherein, The second auxiliary drive motor (13) transmits power to the second output shaft (11) through the third planetary gear set, and merges with the power transmitted by the first main drive motor (1) and the second main drive motor (3).

5. The multi-motor composite electric drive axle of claim 1, wherein, The ratio of the number of teeth of the first planetary carrier (5) to the number of teeth of the transmission component (4) is defined as K1, and the ratio of the number of teeth of the transmission component (4) to the number of teeth of the input component (2) is defined as K2. The product of the two is K1xK2=4.

6. The multi-motor composite electric drive axle of claim 1, wherein, The first planetary gear (6) and the second planetary gear (14) have the same number of teeth; the ratio of the number of teeth of the first sun gear (15) to the second sun gear (10) is K3=1; the ratio of the number of teeth of the first gear ring (20) to the third sun gear (21) is K4=3; the ratio of the number of teeth of the second gear ring (7) to the fourth sun gear (12) is K5=3.

7. The multi-motor composite electric drive axle of claim 1, wherein, The multi-motor composite electric drive bridge is used to achieve three working modes, namely: When the first main drive motor (1) and the second main drive motor (3) work synchronously, the first auxiliary drive motor (16) and the second auxiliary drive motor (13) do not work, and the main drive motors operate independently: When the first auxiliary drive motor (16) and the second auxiliary drive motor (13) are driven independently, the first main drive motor (1) and the second main drive motor (3) are not working, which is the working mode of independent drive of auxiliary drive motors: When the first main drive motor (1) and the second main drive motor (3) work synchronously, the first auxiliary drive motor (16) and the second auxiliary drive motor (13) assist in driving, which is a combined drive working mode of main and auxiliary drive motors.

8. The multi-motor complex electric drive axle of claim 7, wherein, The main drive motor operates in an independent drive mode: The power of the first main drive motor (1) and the second main drive motor (3) is sequentially output to the first output shaft (17) and the second output shaft (11) via the input component (2), the transmission component (4) and the first planetary gear set. This working mode is used for normal vehicle operation.

9. The multi-motor complex electric drive axle of claim 7, wherein, The auxiliary drive motor operates in independent drive mode: The power of the first auxiliary drive motor (16) and the second auxiliary drive motor (13) is transmitted to the first output shaft (17) and the second output shaft (11) respectively through the second planetary gear set and the third planetary gear set; this working mode is used for small-radius steering of the vehicle and getting out of trouble on complex road surfaces.

10. The multi-motor composite electric drive bridge as described in claim 7, characterized in that, Under the combined drive of the main and auxiliary drive motors: The power of the first main drive motor (1) and the second main drive motor (3) is transmitted to the first output shaft (17) and the second output shaft (11) via the input component (2), the transmission component (4) and the first planetary gear set. The first auxiliary drive motor (16) transmits power to the first output shaft (17) through the second planetary gear set, and merges with the power transmitted by the first main drive motor (1) and the second main drive motor (3); The second auxiliary drive motor (13) transmits power to the second output shaft (11) through the third planetary gear set, and merges with the power transmitted by the first main drive motor (1) and the second main drive motor (3); This operating mode is for vehicles traveling on difficult roads and slopes.

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