Electric vehicle drive device

Abstract

The invention provides an electric vehicle driving device. An electric vehicle driving apparatus of an embodiment is used for reducing a driving speed of a motor and transmitting the reduced driving speed to an output shaft. The apparatus includes: a first planetary gear set including three first planetary gear elements, where a first element is connected to an electric machine and a second element is connected to a first output shaft; a second planetary gear set including three second planetary gear elements, where the first element is connected to a third element of the three first planetary gear elements, the second element is connected to the second output shaft, and the third element is fixed; and a third planetary gear set including three third planetary gear elements, where the first element and the second element are connected to two elements of the three first planetary gear elements, respectively, and the third element is connected to the torque vectoring motor.

Description

Technical Field

[0001] The invention relates to an electric vehicle driving device. Background Art

[0002] Electric vehicle drive devices transmit power generated by a motor to a drive shaft connected to wheels. These electric drive devices require a speed reducer, in particular, a planetary gear speed reducer configured to transmit a larger power than the reduction ratio of the planetary gear elements (e.g., sun gear, ring gear, and planet carrier).

[0003] The differential function is a function that distributes torque to the left and right wheels when the vehicle is driving in a circle. The torque vectoring function is a function that adjusts the torque ratio distributed to the left and right wheels by actively controlling the differential function.

[0004] However, in the prior art, the torque vectoring structure of the structure of the speed reducer performing the differential function requires adding two sets of planetary gears to the differential, thereby increasing the overall length. In addition, since the speed reducer adopts a structure without a separate differential, it is difficult to combine the torque vectoring structure used in the prior art.

[0005] The above matters are intended to help understanding the background of the present invention and may include matters that are not known to the public although they are referred to as prior art. Summary of the invention

[0006] The present invention relates to an electric vehicle driving device. A specific embodiment relates to a driving device capable of performing a deceleration function and a torque vectoring function.

[0007] Embodiments of the present invention provide an electric vehicle driving apparatus capable of performing a speed reduction function and a torque vectoring function by combining planetary gears, thereby minimizing an increase in overall length.

[0008] According to an embodiment of the present invention, an electric vehicle drive device is provided for reducing the driving speed of a motor and transmitting the reduced driving speed to an output shaft. The device includes: a first planetary gear set, which includes three first planetary gear elements, a first sun gear, a first planet carrier and a first ring gear, one element of the three first planetary gear elements is connected to the motor, and another element of the three first planetary gear elements is connected to the first output shaft; a second planetary gear set, which includes three second planetary gear elements, a second sun gear, a second planet carrier and a second ring gear, one element of the three second planetary gear elements is connected to the remaining elements of the three first planetary gear elements, another element of the three second planetary gear elements is connected to the second output shaft, and the remaining elements of the three second planetary gear elements are fixed; and a third planetary gear set, which includes three third planetary gear elements, a third sun gear, a third planet carrier and a third ring gear, two elements of the three third planetary gear elements are respectively connected to two elements of the three first planetary gear elements, and the remaining elements of the three third planetary gear elements are connected to the torque vectoring motor.

[0009] In the electric vehicle driving apparatus, two elements of the three third planetary gear elements may be respectively connected to two elements of the three first planetary gear elements that are not connected to the motor.

[0010] In the electric vehicle drive apparatus, the gear ratio of the third planetary gear set may be generated by a combination of gear ratios that achieve a speed of an element connected to the torque vectoring motor of 0 under a straight-ahead driving condition where no differential occurs.

[0011] In the electric vehicle drive device, the third planetary gear set can be a single pinion planetary gear set, and the third sun gear of the three third planetary gear elements can be connected to the first ring gear in the first planetary gear set, the third ring gear can be connected to the first planet carrier, and the third planet carrier can be connected to the torque vectoring motor.

[0012] In the electric vehicle drive device, the third planetary gear set can be a single pinion planetary gear set, and the third sun gear of the three third planetary gear elements can be connected to the first planet carrier in the first planetary gear set, the third ring gear can be connected to the first ring gear, and the third planet carrier can be connected to the torque vectoring motor.

[0013] In the electric vehicle driving device, when it is assumed that the gear ratio of the first planetary gear set is λ 1 =Z R1 / Z S1 When the gear ratio of the second planetary gear set is 2 =1 / λ 1 +2; and reduction ratio = 1 + λ 1 λ2 The gear ratio of the third planetary gear set can be expressed by the following relationship: 3 :λ 2 –1Established.

[0014] In the electric vehicle drive apparatus, when elements in the third planetary gear set rotate in the same direction as the output shaft by driving the torque vectoring motor in one direction, the speed of the first output shaft may increase and the speed of the second output shaft may decrease.

[0015] In the electric vehicle drive apparatus, when elements in the third planetary gear set rotate in a direction opposite to the output shaft by driving the torque vectoring motor in a direction opposite to the one direction, the speed of the first output shaft can be reduced and the speed of the second output shaft can be increased.

[0016] In the electric vehicle drive apparatus, an element in the third planetary gear set to be connected to the torque vectoring motor may be connected to the torque vectoring motor through a speed reduction mechanism.

[0017] In the electric vehicle drive device, the third planetary gear set can be a double pinion planetary gear set, and the third sun gear of the three third planetary gear elements can be connected to the first planet carrier in the first planetary gear set, the third planet carrier can be connected to the first ring gear, and the third ring gear can be connected to the torque vectoring motor.

[0018] In the electric vehicle driving device, when it is assumed that the gear ratio of the first planetary gear set is λ 1 =Z R1 / Z S1 When the gear ratio of the second planetary gear set is 2 =1 / λ 1 +2; and reduction ratio = 1 + λ 1 λ 2 The gear ratio of the third planetary gear set can be expressed by the following relationship: 3 =λ 2 / (λ 2 -1) Establishment.

[0019] In the electric vehicle drive device, the third planetary gear set can be a double pinion planetary gear set, and the third sun gear as the third planetary gear element can be connected to the first ring gear in the first planetary gear set, the third planet carrier can be connected to the first planet carrier, and the third ring gear can be connected to the torque vectoring motor.

[0020] In the electric vehicle drive device, the third planetary gear set can be a double pinion planetary gear set, and the third sun gear of the three third planetary gear elements can be connected to the first ring gear in the first planetary gear set, the third planet carrier can be connected to the first planet carrier, and the third ring gear can be connected to the torque vectoring motor.

[0021] In the electric vehicle driving device, when it is assumed that the gear ratio of the first planetary gear set is λ 1 =Z R1 / Z S1 When the gear ratio of the second planetary gear set is 2 =1 / λ 1 +2; and reduction ratio = 1 + λ 1 λ 2 The gear ratio of the third planetary gear set can be expressed by the following relationship: 3 =λ 2 Establish.

[0022] In the electric vehicle drive apparatus, elements of the three second planetary gear elements to be connected to the remaining elements of the three first planetary gear elements and to be connected to another element are directly connected to the remaining elements of the three first planetary gear elements.

[0023] According to another embodiment of the present invention, an electric vehicle drive device is provided for reducing the driving speed of a motor and transmitting the reduced driving speed to an output shaft. The device includes: a first planetary gear set, which includes three first planetary gear elements, a first sun gear, a first planet carrier and a first ring gear, one element of the three first planetary gear elements is connected to the motor, and another element of the three first planetary gear elements is connected to the first output shaft; a second planetary gear set, which includes three second planetary gear elements, a second sun gear, a second planet carrier and a second ring gear, one element of the three second planetary gear elements is connected to the second output shaft; and a third planetary gear set, which includes three third planetary gear elements, a third sun gear, a third planet carrier, a third ring gear, one element of the three third planetary gear elements is connected to another element of the three second planetary gear elements, two elements of the three third planetary gear elements that are not connected to the motor are respectively connected to two elements of the three first planetary gear elements, and the remaining elements of the three third planetary gear elements are connected to the torque vectoring motor.

[0024] According to another embodiment of the present invention, an electric vehicle drive device is provided for reducing the driving speed of a motor and transmitting the reduced driving speed to an output shaft. The device includes: a first planetary gear set including three first planetary gear elements, a first sun gear, a first planet carrier and a first ring gear, one element of the three first planetary gear elements is connected to the motor, and another element of the three first planetary gear elements is connected to the first output shaft; a second planetary gear set including three second planetary gear elements, a second sun gear, a second planet carrier and a second ring gear, one element of the three second planetary gear elements is connected to the remaining elements of the three first planetary gear elements, and another element of the three second planetary gear elements is connected to the second output shaft; and a third planetary gear set including three third planetary gear elements, a third sun gear, a third planet carrier and a third ring gear, the third sun gear is configured as the same element as the first ring gear, another element of the three third planetary gear elements is connected to one element of the three first planetary gear elements that is not connected to the motor, and the remaining elements of the three third planetary gear elements are connected to the torque vectoring motor.

[0025] Generally, in order to realize the torque vectoring function, two sets of planetary gears need to be added. However, with the structure according to the embodiment of the present invention, the torque vectoring function can be realized by adding only one set of planetary gears, thereby reducing the manufacturing cost.

[0026] In the case of adding planetary gears and the like to realize the torque vectoring function, the overall length of the in-line speed reducer increases, thereby causing problems with installability. However, with the structure according to the embodiment of the present invention, the increase in overall length can be minimized. Therefore, the torque vectoring function can be added to the in-line speed reducer, and installability can be ensured.

[0027] In addition, when the planetary gears constituting the speed reducer are arranged in a double-row structure, the torque vectoring function can be added while further reducing the overall length. Therefore, this method can also be used for situations where the motor size needs to be increased to enhance the output of high-performance vehicles.

[0028] The structure according to the embodiment of the present invention is applicable to all structures of speed reducers that perform speed reduction and differentiation using two sets of planetary gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram showing an electric vehicle driving device according to a first embodiment of the present invention.

[0030] Figures 2 to 8 is a lever diagram used to describe the differential and torque vectoring functions.

[0031] Fig. 91 is a lever diagram showing the electric vehicle drive apparatus according to the first embodiment of the present invention, for describing the speed reduction ratio.

[0032] Fig.10 is a schematic diagram showing an electric vehicle driving device according to a second embodiment of the present invention.

[0033] Fig.11 It shows that according to Fig.10 A lever diagram of an electric vehicle driving device according to a second embodiment of the present invention.

[0034] Fig.12 is a schematic diagram showing an electric vehicle driving device according to a third embodiment of the present invention.

[0035] Fig.13 It shows that according to Fig.12 A lever diagram of an electric vehicle drive device according to a third embodiment of the present invention.

[0036] Fig.14 is a schematic diagram showing an electric vehicle driving device according to a fourth embodiment of the present invention.

[0037] Fig.15 It shows that according to Fig.14 A lever diagram of an electric vehicle drive device according to a fourth embodiment of the present invention.

[0038] Figures 16 to 19 1 and 2 are schematic diagrams showing electric vehicle driving devices according to fifth to eighth embodiments of the present invention, respectively, in sequence. DETAILED DESCRIPTION

[0039] For a fuller understanding of the embodiments of the present invention, including its operating advantages and features that may be realized by preferred embodiments thereof, reference should be made to the accompanying drawings in which preferred embodiments are illustrated, and the contents of the drawings.

[0040] Descriptions of well-known technologies associated with the preferred embodiments of the present invention are shortened or omitted when the nature and gist of the present invention are unnecessarily obscure.

[0041] Figure 1 is a schematic diagram showing an electric vehicle driving device according to a first embodiment. Figures 2 to 8 is a lever diagram used to describe the differential and torque vectoring functions.

[0042] Reference below Figures 1 to 8 An electric vehicle driving device according to a first embodiment of the present invention is described.

[0043] refer to Figure 1, by adding the third planetary gear set 180 to the first planetary gear set 120 and the second planetary gear set 130, the electric vehicle driving apparatus according to the first embodiment of the present invention is configured to not only function as a speed reducer but also perform a torque vectoring function.

[0044] Each planetary gear set is configured with three planetary gear elements: a sun gear, a planet carrier and a ring gear.

[0045] That is, the first planetary gear set 120 includes a first planetary gear element, which includes a first sun gear S1, a first planet carrier C1, and a first ring gear R1. Similarly, the second planetary gear set 130 includes a second planetary gear element, which includes a second sun gear S2, a second planet carrier C2, and a second ring gear R2. In a similar manner, the third planetary gear set 180 includes a third planetary gear element, which includes a third sun gear S3, a third planet carrier C3, and a third ring gear R3.

[0046] The first sun gear S1, which is one element in the first planetary gear set 120, is connected to the input shaft of the motor 110. The first ring gear R1, which is another element in the first planetary gear set 120, is connected to the second planetary gear set 130 directly or through a connecting member 140. The first planet carrier C1, which is the remaining element in the first planetary gear set 120, is connected to the first output shaft 150.

[0047] One element of the second planetary gear set 130 connected to the first planetary gear set 120 may be a second sun gear S2. A second ring gear R2 as another element of the second planetary gear set 130 is fixed to the reducer housing 170, and a second planet carrier C2 as the remaining element of the second planetary gear set 130 is connected to the second output shaft 160.

[0048] The first output shaft 150 and the second output shaft 160 are coupled to the left and right wheels, respectively. As a result of the gear ratio between the first planetary gear set 120 and the second planetary gear set 130 combined as described above, a speed reduction function and a differential function are performed.

[0049] In addition, two elements of the third planetary gear set 180 are respectively connected to two elements of the three planetary gear elements of the first planetary gear set 120 that are not connected to the motor 110 .

[0050] That is, the first ring gear R1 in the first planetary gear set 120 may be connected to the third sun gear S3 in the third planetary gear set 180 , and the first planet carrier C1 of the first planetary gear set 120 may be connected to the third ring gear R3 of the third planetary gear set 180 .

[0051] The third planet carrier C3 , which is the remaining element in the third planetary gear set 180 , is connected to the torque vectoring motor 200 directly or through a speed reduction mechanism 190 .

[0052] The gear ratio of the third planetary gear set 180 is generated by a combination of gear ratios that achieve a speed of 0 for the element C3 connected to the torque vectoring motor 200 under a straight-forward driving condition where no differential occurs.

[0053] refer to Figures 2 to 6 Describe the working principles behind electric vehicle drives.

[0054] refer to Figure 2 Under the straight-ahead driving condition, power is transmitted to both output shafts at the same speed and the same torque at the reduction ratio determined by the first planetary gear set 120 and the second planetary gear set 130. At this time, the element C3 of the elements of the third planetary gear set 180 connected to the torque vectoring motor 200 is in a stationary state.

[0055] like Figure 3 As shown, the occurrence of the differential increases the speed of the first output shaft and reduces the speed of the second output shaft. When doing so, the element C3 of the third planetary gear set 180 connected to the torque vectoring motor 200 rotates in the same direction as the output shaft.

[0056] like Figure 4 As shown, the occurrence of the opposite direction differential reduces the speed of the first output shaft and increases the speed of the second output shaft. When doing so, the element C3 connected to the torque vectoring motor 200 rotates in the opposite direction to the output shaft.

[0057] Next, if Figure 5 As shown, when element C3 in the third planetary gear set 180 rotates in the same direction as the output shaft by driving the torque vectoring motor 200, the speed of the first output shaft increases and the speed of the second output shaft decreases, thereby performing a torque vectoring function.

[0058] like Figure 6 As shown, when element C3 in the third planetary gear set 180 rotates in the opposite direction to the output shaft by driving the torque vectoring motor 200 in the opposite direction, the speed of the first output shaft decreases and the speed of the second output shaft increases, thereby performing the torque vectoring function in the opposite direction.

[0059] In the first embodiment of the present invention, a single pinion planetary gear is used in the third planetary gear set 180. In addition, the third sun gear S3 in the third planetary gear set 180 and the first ring gear R1 in the first planetary gear set 120 are connected to each other, the third ring gear R3 in the third planetary gear set 180 and the first planet carrier C1 in the first planetary gear set 120 are connected to each other, and the torque vectoring motor 200 is connected to the third planet carrier C3 in the third planetary gear set 180.

[0060] refer to Fig. 9 , when the planetary gear ratio is assumed to be λ 1 =Z R1 / Z S1 When , the following equation is established: 2 =1 / λ 1 +2; reduction ratio = 1 + λ 1 λ 2 .

[0061] At this time, the planetary gear ratio of torque vectoring is defined as λ 3 :λ 2 -1.

[0062] The embodiments of the present invention may be implemented in various ways according to the planetary gear connection technology, and need to satisfy the following two conditions.

[0063] 1) Depth function determination: When the speeds of the left and right wheels are the same, the same torque is output, that is, Z_R2 = (Z_R1+1) / Z_R1.

[0064] 2) Vectoring function determination: When the speeds of the left and right wheels are the same, torques of equal magnitude are output in opposite directions.

[0065] The structure of three planetary gears that meet the above conditions is as follows Figure 7 and Figure 8 Various implementations may be implemented depending on how each element in the third planetary gear set 180 is connected to each element in the first planetary gear set 120 and each element in the second planetary gear set 130 .

[0066] Fig.10 is a schematic diagram showing an electric vehicle driving device according to a second embodiment of the present invention. Fig.11 It shows that according to Fig.10 A lever diagram of an electric vehicle driving device according to a second embodiment of the present invention.

[0067] In the electric vehicle drive device according to the second embodiment of the present invention, the double pinion planetary gear can be used as a torque vectoring planetary gear. In addition, the third sun gear S3 in the third planetary gear set 182 and the first planet carrier C1 in the first planetary gear set 122 can be connected to each other, the third planet carrier C3 in the third planetary gear set 182 and the first ring gear R1 in the first planetary gear set 122 can be connected to each other, and the torque vectoring motor 200 can be connected to the third ring gear R3 in the third planetary gear set 182.

[0068] When the planetary gear ratio is assumed to be λ 1 =Z R1 / Z S1 When , the following equation is established: 2 =1 / λ 1 +2; reduction ratio = 1 + λ 1 λ 2 .

[0069] At this time, the planetary gear ratio of torque vectoring is defined as λ 3 =λ 2 / (λ 2 -1).

[0070] Fig.12 is a schematic diagram showing an electric vehicle driving device according to a third embodiment of the present invention. Fig.13 It shows that according to Fig.12 A lever diagram of an electric vehicle drive device according to a third embodiment of the present invention.

[0071] In the electric vehicle drive device according to the third embodiment of the present invention, the double pinion planetary gear can be used as a torque vectoring planetary gear. In addition, the third sun gear S3 in the third planetary gear set 183 and the first ring gear R1 in the first planetary gear set 123 can be connected to each other, the third planet carrier C3 in the third planetary gear set 183 and the first planet carrier C1 in the first planetary gear set 123 can be connected to each other, and the torque vectoring motor 200 can be connected to the third ring gear R3 in the third planetary gear set 183.

[0072] When the planetary gear ratio is assumed to be λ 1 =Z R1 / Z S1 When , the following equation is established: 2 =1 / λ 1 +2; reduction ratio = 1 + λ 1 λ 2 .

[0073] At this time, the planetary gear ratio of torque vectoring is defined as λ 3 =λ 2 .

[0074] Fig.14 is a schematic diagram showing an electric vehicle driving device according to a fourth embodiment of the present invention. Fig.15 It shows that according to Fig.14 A lever diagram of an electric vehicle drive device according to a fourth embodiment of the present invention.

[0075] A structure is adopted in which the second sun gear S2 in the second planetary gear set 134 constituting the speed reducer is directly connected to the outer side of the first ring gear R1 in the first planetary gear set 124. The connection structure of the torque vectoring planetary gears is the same as that of the first embodiment.

[0076] The single pinion planetary gear may be used as a torque vectoring planetary gear. In addition, the third sun gear S3 in the third planetary gear set 184 and the first ring gear R1 in the first planetary gear set 124 may be connected to each other, the third ring gear R3 in the third planetary gear set 184 and the first planet carrier C1 in the first planetary gear set 124 may be connected to each other, and the torque vectoring motor 200 may be connected to the third planet carrier C3 in the third planetary gear set 184.

[0077] When the planetary gear ratio is assumed to be λ 1 =Z R1 / Z S1 When , the following equation is established: 2 =1 / λ 1 +2; reduction ratio = 1 + λ 1 λ 2 .

[0078] At this time, the planetary gear ratio of torque vectoring is defined as λ 3 =λ 2 –1.

[0079] In addition, various modifications may be made to the electric vehicle driving device according to the embodiment of the present invention, such as Figures 16 to 19 shown.

[0080] Fig.16 The electric vehicle drive device according to the fifth embodiment of the present invention shown is different from the electric vehicle drive device according to the first embodiment of the present invention. The difference is that in the electric vehicle drive device according to the fifth embodiment, the first planet carrier C1 in the first planetary gear set 125 is connected to the third sun gear S3 in the third planetary gear set 185, and the first ring gear R1 in the first planetary gear set 125 is connected to the third ring gear R3 in the third planetary gear set 185. The second ring gear R2 in the second planetary gear set 135 is connected to the second output shaft 160.

[0081] Fig.17The electric vehicle drive device according to the sixth embodiment of the present invention shown is different from the electric vehicle drive device according to the first embodiment of the present invention. The difference is that in the electric vehicle drive device according to the sixth embodiment of the present invention, the third sun gear S3 in the third planetary gear set 186 is connected to the second sun gear S2 in the second planetary gear set 136 instead of the first planetary gear set 126, and the second ring gear R2 in the second planetary gear set 136 is connected to the second output shaft 160.

[0082] exist Fig.18 In the electric vehicle drive apparatus according to the seventh embodiment of the present invention, the first ring gear in the first planetary gear set 127 and the third sun gear S3 in the third planetary gear set 187 are configured as one element. The resulting element is connected to the second sun gear S2 in the second planetary gear set 137. The second ring gear R2 in the second planetary gear set 137 is connected to the second output shaft 160.

[0083] exist Fig.19 In the electric vehicle drive apparatus according to the eighth embodiment of the present invention shown, the first ring gear R1 in the first planetary gear set 128 and the third sun gear S3 in the third planetary gear set 188 are configured as one element. The resulting element is connected to the second sun gear S2 in the second planetary gear set 138. The first planet carrier C1 in the first planetary gear set 128 is connected to the third planet carrier C3 in the third planetary gear set 188. The second planet carrier C2 in the second planetary gear set 138 is connected to the second output shaft 160.

[0084] The exemplary embodiments of the present invention are described above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the exemplary embodiments. It is obvious to those of ordinary skill in the art that various modifications and changes can be made to the embodiments without departing from the nature and gist of the present invention. The resulting modifications or changes should fall within the scope of the claims of the present invention. The scope of the embodiments of the present invention should be defined by the appended claims.

Claims

1. An electric vehicle drive device for reducing a driving speed of a motor and transmitting the reduced driving speed to an output shaft, the device comprising: A first planetary gear set includes three first planetary gear elements, wherein the three first planetary gear elements include a first sun gear, a first planet carrier and a first ring gear, wherein: The first elements of the three first planetary gear elements are connected to the motor; The second elements of the three first planetary gear elements are connected to the first output shaft; a second planetary gear set, which includes three second planetary gear elements, the three second planetary gear elements include a second sun gear, a second planet carrier and a second ring gear, wherein: The first elements of the three second planetary gear elements are connected to the third elements of the three first planetary gear elements; The second elements of the three second planetary gear elements are connected to the second output shaft; The third elements of the three second planetary gear elements are fixed; and a third planetary gear set, which includes three third planetary gear elements, the three third planetary gear elements including a third sun gear, a third planet carrier and a third ring gear, wherein: The first and second elements of the three third planetary gear members are connected to two elements of the three first planetary gear members, respectively, and the third elements of the three third planetary gear members are connected to the torque vectoring motor.

2. The electric vehicle driving device according to claim 1, wherein: The first elements of the three third planetary gear elements are connected to the third elements of the three first planetary gear elements, and the second elements of the three third planetary gear elements are connected to the first element of the first planetary gear element or the second element of the first planetary gear element.

3. The electric vehicle driving device according to claim 2, wherein: The gear ratio of the third planetary gear set is generated by a combination of gear ratios that achieve a speed of 0 for the third element of the third planetary gear set connected to the torque vectoring motor under a straight-forward driving condition where no differential occurs.

4. The electric vehicle driving device according to claim 3, wherein: When an element among the three third planetary gear elements rotates in the same direction as the output shaft by driving the torque vectoring motor in the first direction, the speed of the first output shaft increases and the speed of the second output shaft decreases.

5. The electric vehicle driving device according to claim 4, wherein: When one of the three third planetary gear elements rotates in a direction opposite to the output shaft by driving the torque vectoring motor in a second direction opposite to the first direction, the speed of the first output shaft decreases and the speed of the second output shaft increases.

6. The electric vehicle driving device according to claim 3, wherein: The third elements of the three third planetary gear elements connected to the torque vectoring motor are connected to the torque vectoring motor through a reduction mechanism.

7. The electric vehicle driving device according to claim 2, wherein: The third planetary gear set is a single pinion planetary gear set; The third sun gear is connected to the first ring gear, the third ring gear is connected to the first planet carrier, and the third planet carrier is connected to a torque vectoring motor.

8. The electric vehicle driving device according to claim 7, wherein: Assuming that the gear ratio of the first planetary gear set is λ1=Z R1 / Z S1 In the case of, the gear ratio of the second planetary gear set is λ2=1 / λ1+2, and the reduction ratio is 1+λ1λ2; The gear ratio of the third planetary gear set is established by the relationship λ3=λ2−1.

9. The electric vehicle driving device according to claim 8, wherein: The first elements of the three second planetary gear elements connected to the third elements of the three first planetary gear elements are directly connected to the third elements of the three first planetary gear elements.

10. The electric vehicle driving device according to claim 2, wherein: The third planetary gear set is a single pinion planetary gear set; The third sun gear is connected to the first planet carrier, the third ring gear is connected to the first ring gear, and the third planet carrier is connected to a torque vectoring motor.

11. The electric vehicle driving device according to claim 10, wherein: Assuming that the gear ratio of the first planetary gear set is λ1=Z R1 / Z S1 In the case of, the gear ratio of the second planetary gear set is λ2=1 / λ1+2, and the reduction ratio is 1+λ1λ2; The gear ratio of the third planetary gear set is established by the relationship λ3=λ2−1.

12. The electric vehicle driving device according to claim 2, wherein: The third planetary gear set is a double pinion planetary gear set; The third sun gear is connected to the first planet carrier, the third planet carrier is connected to the first ring gear, and the third ring gear is connected to a torque vectoring motor.

13. The electric vehicle driving device according to claim 12, wherein: Assuming that the gear ratio of the first planetary gear set is λ1=Z R1 / Z S1 In the case of, the gear ratio of the second planetary gear set is λ2=1 / λ1+2, and the reduction ratio is 1+λ1λ2; The gear ratio of the third planetary gear set is established by the relationship λ3=λ2 / (λ2-1).

14. The electric vehicle driving device according to claim 2, wherein: The third planetary gear set is a double pinion planetary gear set; The third sun gear is connected to the first ring gear, the third planet carrier is connected to the first planet carrier, and the third ring gear is connected to a torque vectoring motor.

15. The electric vehicle driving device according to claim 14, wherein: Assuming that the gear ratio of the first planetary gear set is λ1=Z R1 / Z S1 In the case of, the gear ratio of the second planetary gear set is λ2=1 / λ1+2, and the reduction ratio is 1+λ1λ2; The gear ratio of the third planetary gear set is established by the relationship λ3=λ2.

16. The electric vehicle driving device according to claim 2, wherein: The third planetary gear set is a double pinion planetary gear set; The third sun gear is connected to the first ring gear, the third planet carrier is connected to the first planet carrier, and the third ring gear is connected to the torque vectoring motor; Assuming that the gear ratio of the first planetary gear set is λ1=Z R1 / Z S1 In the case of, the gear ratio of the second planetary gear set is λ2=1 / λ1+2, and the reduction ratio is 1+λ1λ2; The gear ratio of the third planetary gear set is established by the relationship λ3=λ2.

17. An electric vehicle driving device for reducing a driving speed of a motor and transmitting the reduced driving speed to an output shaft, the device comprising: A first planetary gear set includes three first planetary gear elements, wherein the three first planetary gear elements include a first sun gear, a first planet carrier and a first ring gear, wherein: The first elements of the three first planetary gear elements are connected to the motor; The second elements of the three first planetary gear elements are connected to the first output shaft; a second planetary gear set, which includes three second planetary gear elements, the three second planetary gear elements include a second sun gear, a second planet carrier and a second ring gear, wherein the first elements of the three second planetary gear elements are connected to the second output shaft; and The third planetary gear set includes three third planetary gear elements, wherein the three third planetary gear elements include a third sun gear, a third planet carrier, and a third ring gear, wherein: The first elements of the three third planetary gear elements are connected to the second elements of the three second planetary gear elements; The first and second elements of the three third planetary gear elements that are not connected to the motor are respectively connected to two elements of the three first planetary gear elements, and the third elements of the three third planetary gear elements are connected to the torque vectoring motor.

18. An electric vehicle driving device for reducing a driving speed of a motor and transmitting the reduced driving speed to an output shaft, the device comprising: A first planetary gear set includes three first planetary gear elements, wherein the three first planetary gear elements include a first sun gear, a first planet carrier and a first ring gear, wherein: The first elements of the three first planetary gear elements are connected to the motor; The second elements of the three first planetary gear elements are connected to the first output shaft; a second planetary gear set, which includes three second planetary gear elements, the three second planetary gear elements include a second sun gear, a second planet carrier and a second ring gear, wherein: The first elements of the three second planetary gear elements are connected to the third elements of the three first planetary gear elements; The second elements of the three second planetary gear elements are connected to the second output shaft; and A third planetary gear set includes three third planetary gear elements, wherein the three third planetary gear elements include a third sun gear, a third planet carrier and a third ring gear, wherein: The first element of the three third planetary gear elements is a third sun gear and is configured as the same element as the first ring gear; The second elements of the three third planetary gear elements are connected to the second elements of the three first planetary gear elements; The third members of the three third planetary gear members are connected to the torque vectoring motor.

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