Driving system of dual-motor pure electric vehicle

Abstract

The utility model discloses a driving system of a double-motor pure electric vehicle, which comprises a first motor and a second motor which are arranged up and down, motor shafts of the first motor and the second motor are arranged back to back, the motor shaft of the first motor is provided with a first planet row, and the first planet row is in transmission connection with a first half shaft through a second planet row; a third planet row is arranged on a motor shaft of the second motor, the third planet row is in transmission connection with a second half shaft through a transmission assembly, the second half shaft is coaxial with a motor shaft of the first motor and the first half shaft, and hubs are fixedly arranged on the second half shaft and the first half shaft. The utility model has the main beneficial effects that: the layout is reasonable, the radial arrangement of the first motor and the second motor can greatly reduce the axial size, reduce the occupied arrangement space of the chassis structure, and give consideration to the dynamic property and economical efficiency of the whole vehicle to the greatest extent. According to the design, the requirement for the space of the whole vehicle is low, and wide applicability is achieved.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and more particularly to a drive system for a dual-motor pure electric vehicle. Background Technology

[0002] Today, new energy vehicles have become the future direction of transportation, aiming to replace traditional petrochemical energy sources with new energy power, thereby solving the problems of environmental pollution and the depletion of petrochemical resources. Pure electric vehicles, as one of the typical representatives of new energy vehicles, are already widely known to consumers, and with the maturity of lithium-ion battery technology, the number of pure electric vehicles on the market is increasing daily.

[0003] For example, Chinese Patent No. 213007565U discloses an integrated dual-motor coupled drive device and an electric vehicle, including a housing. The housing contains symmetrically arranged transmission components. The output end of each transmission component is connected to its corresponding wheel axle via a coupling element I, and its input end is connected to its corresponding motor via a coupling element II. The motors are located between adjacent wheel axles, and the central axis of the motor shaft is coaxial with the central axis of the wheel axle. However, the axial dimension of such an electric drive axle (the distance between the first and second wheels) is particularly long, occupying chassis layout space, affecting the number of batteries and transmission efficiency, resulting in a short driving range and making it difficult to balance vehicle power and economy. Furthermore, the system has a small gearbox ratio, high cost, and excessively large radial dimensions, leading to a reduction in ground clearance and an increase in half-shaft sway angle, consequently reducing transmission efficiency to the wheel ends. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a drive system for a dual-motor pure electric vehicle.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A drive system for a dual-motor pure electric vehicle includes a first motor and a second motor positioned vertically. The motor shafts of the first motor and the second motor are arranged opposite to each other. A first planetary gear set is provided on the motor shaft of the first motor, and the first planetary gear set is connected to a first half-shaft via a second planetary gear set. A third planetary gear set is provided on the motor shaft of the second motor, and the third planetary gear set is connected to a second half-shaft via a transmission assembly. The second half-shaft is coaxial with the motor shaft of the first motor and the first half-shaft. A hub is also fixedly provided on both the second half-shaft and the first half-shaft.

[0007] Preferably, the first planetary gear set includes a first planetary carrier fixedly mounted on the gearbox and a first planetary gear mounted on the first planetary carrier. The first planetary gear is located between and meshes with the first sun gear and the first ring gear. The first sun gear is fixedly mounted on the motor shaft of the first motor, and the second planetary gear set is connected to the first ring gear.

[0008] Preferably, the second planetary gear set includes a second planetary carrier fixedly connected to the first half-shaft, a second planetary gear is disposed on the second planetary carrier, the second planetary gear is located between the second sun gear and the second ring gear and meshes with both, the second sun gear is fixedly disposed on the first ring gear and the second ring gear is fixedly disposed on the gearbox.

[0009] Preferably, the gearbox also includes a linkage shaft, on which a linkage gear is loosely fitted. The linkage gear meshes with a drive gear fixedly mounted on the second motor shaft and a driven gear fixedly mounted on the first gear ring.

[0010] Preferably, the third planetary gear set includes a third planetary carrier fixedly mounted on the gearbox and a third planetary gear mounted on the third planetary carrier. The third planetary gear is located between the third sun gear and the third ring gear and meshes with both. The third sun gear is fixedly mounted on the motor shaft of the second motor, and the transmission assembly is mounted on the third ring gear.

[0011] Preferably, the transmission assembly includes at least a connecting shaft fixedly mounted on the third gear ring, a drive gear fixedly mounted on the connecting shaft, a transmission gear fixedly mounted on the second half-shaft, and an idler gear meshing between the transmission gear and the drive gear.

[0012] Preferably, the maximum distance between the first motor and the second motor is the maximum height of the system.

[0013] Preferably, the first motor and the second motor are high-speed motors.

[0014] The beneficial effects of this utility model are mainly reflected in:

[0015] 1. The layout is reasonable. The radial arrangement of the first and second motors can significantly reduce the axial dimensions and the space occupied in the chassis structure, maximizing the balance between the vehicle's power and economy. This design has relatively low space requirements for the entire vehicle and has wide applicability.

[0016] 2. The arrangement of the first, second, and third planetary gear sets allows the system assembly to have a larger transmission ratio, which can reduce the size and weight of the system assembly, making the layout more compact and reducing the space occupied.

[0017] 3. The second half-shaft is coaxial with the motor shaft of the first motor and the first half-shaft, which can ensure the accuracy of the hub assembly position and improve safety. In addition, it can also reduce the radial space occupied, making the structure more compact and the layout more reasonable.

[0018] 4. When an electric vehicle is driving in harsh conditions, the linkage gear slides on the linkage shaft and meshes with the driving and driven gears to increase the vehicle's torque, thereby improving traction and enabling the vehicle to get out of trouble in time, ensuring safe driving. At the same time, this design can use a lower-specification motor while meeting the same climbing power requirements, which greatly reduces the overall vehicle weight and cost, enhances the vehicle's acceleration and off-road capabilities, and improves the vehicle's handling safety. Attached Figure Description

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0020] Figure 1 : A schematic diagram of the structure of the first preferred embodiment of this utility model;

[0021] Figure 2 : A schematic diagram of the structure of the second preferred embodiment of this utility model. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 2 As shown, this utility model discloses a drive system for a dual-motor pure electric vehicle, including a first motor 1 and a second motor 2 positioned vertically. The maximum distance between the first motor 1 and the second motor 2 is the maximum height of the system. In the above description, the first motor 1 and the second motor 2 are high-speed motors, which can match the power and torque requirements of the entire vehicle. Of course, the first motor 1 and the second motor 2 can also be flat motors, etc., all of which fall within the protection scope of this utility model and will not be elaborated further here.

[0025] The motor shafts of the first motor 1 and the second motor 2 are arranged opposite to each other. The first motor 1 has a first planetary gear set 3 on its motor shaft, which is connected to the first half-shaft 5 via a second planetary gear set 4. The second motor 2 has a third planetary gear set 6 on its motor shaft, which is connected to the second half-shaft 10 via a transmission assembly 7. The second half-shaft 10 is coaxial with the motor shaft of the first motor 1 and the first half-shaft 5. Both the second half-shaft 10 and the first half-shaft 5 are also fixedly mounted with wheel hubs 9. This radial arrangement of the first and second motors significantly reduces axial dimensions and chassis space requirements, maximizing both vehicle power and fuel economy. This design has low space requirements and wide applicability. Furthermore, the coaxiality of the second half-shaft with the motor shaft of the first motor and the first half-shaft ensures accurate wheel hub mounting, improving safety. It also reduces radial space requirements, resulting in a more compact structure and a more rational layout.

[0026] Specifically, the first planetary gear set 3 includes a first planet carrier 34 fixedly mounted on the gearbox and first planet gears 33 mounted on the first planet carrier 34. The first planet gears 33 are located between and mesh with the first sun gear 31 and the first ring gear 32. The first sun gear 31 is fixedly mounted on the motor shaft of the first motor 1, and the second planetary gear set 4 is connected to the first ring gear 32. The second planetary gear set 4 includes a second planet carrier 44 fixedly connected to the first half-shaft 5. The second planet carrier 44 is provided with second planet gears 43, which are located between and mesh with the second sun gear 41 and the second ring gear 42. The second sun gear 41 is fixedly mounted on the first ring gear 32, and the second ring gear 42 is fixedly mounted on the gearbox. The third planetary gear set 6 includes a third planetary carrier 64 fixedly mounted on the gearbox and a third planetary gear 63 mounted on the third planetary carrier 64. The third planetary gear 63 is located between and meshes with the third sun gear 61 and the third ring gear 62. The third sun gear 61 is fixedly mounted on the motor shaft of the second motor 2, and the transmission assembly 7 is mounted on the third ring gear 62. The arrangement of the first, second, and third planetary gear sets allows the system assembly to have a large transmission ratio, reducing the size and weight of the system assembly, resulting in a more compact layout and reduced space occupation.

[0027] In this embodiment, the transmission assembly 7 includes at least a connecting shaft 71 fixedly mounted on the third gear ring 62, a drive gear 72 fixedly mounted on the connecting shaft 71, a transmission gear 73 fixedly mounted on the second half shaft 10, and an idler gear 74 meshing with the drive gear 72 between the transmission gear 73 and the drive gear 72.

[0028] The working process of this utility model is briefly described below:

[0029] When the first motor 1 starts, it transmits power to the first half-shaft 5 sequentially through the first sun gear 31, the first planetary gear 33, the first ring gear 32, the second sun gear 41, the second planetary gear 43, the second planetary carrier 44, and the first half-shaft 5. Simultaneously, the second motor 2 starts, transmitting power to the second half-shaft 10 sequentially through the third sun gear 61, the third planetary gear 63, the third ring gear 62, the connecting shaft 71, the drive gear 72, the idler gear 74, and the transmission gear 73.

[0030] like Figure 2 As shown in the second preferred embodiment of this utility model, the gearbox also includes a linkage shaft 8, on which a linkage gear 81 is loosely fitted. The linkage gear 81 meshes with a driving gear 82 fixedly mounted on the motor shaft of the second motor 2 and a driven gear 83 fixedly mounted on the first gear ring 32. When the electric vehicle is driving in harsh conditions, such as when the wheels get stuck, the linkage gear slides on the linkage shaft and meshes with the driving and driven gears, increasing the vehicle's torque and thus improving traction. This allows the vehicle to get out of trouble in time, ensuring safe driving. Furthermore, this design allows for the use of a lower-specification motor while maintaining the same climbing power, significantly reducing the overall vehicle weight and cost, enhancing acceleration and off-road capability, and improving handling safety.

[0031] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0032] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. Drive system of a dual-motor pure electric vehicle, comprising a first electric motor (1) and a second electric motor (2) placed one above the other, characterized in that: The motor shafts of the first motor (1) and the second motor (2) are arranged oppositely, the motor shaft of the first motor (1) is provided with a first planetary gear set (3), the first planetary gear set (3) is in transmission connection with a first half shaft (5) through a second planetary gear set (4); the motor shaft of the second motor (2) is provided with a third planetary gear set (6), the third planetary gear set (6) is in transmission connection with a second half shaft (10) through a transmission assembly (7), the second half shaft (10) is coaxial with the motor shaft of the first motor (1) and the first half shaft (5), and the second half shaft (10) and the first half shaft (5) are further fixedly provided with a hub (9).

2. The dual-motor pure electric vehicle drive system according to claim 1, characterized in that: The first planetary gear set (3) comprises a first planetary carrier (34) fixedly arranged on a gearbox and a first planetary gear (33) arranged on the first planetary carrier (34), the first planetary gear (33) is located between a first sun gear (31) and a first ring gear (32) and is in meshing engagement with the two, the first sun gear (31) is fixedly arranged on the motor shaft of the first motor (1), and the first ring gear (32) is connected with the second planetary gear set (4).

3. The dual-motor pure electric vehicle drive system of claim 2, wherein: The second planetary gear set (4) comprises a second planetary carrier (44) fixedly connected with the first half shaft (5), the second planetary carrier (44) is provided with a second planetary gear (43), the second planetary gear (43) is located between a second sun gear (41) and a second ring gear (42) and is in meshing engagement with the two, the second sun gear (41) is fixedly arranged on the first ring gear (32), and the second ring gear (42) is fixedly arranged on the gearbox.

4. The dual-motor pure electric vehicle drive system of claim 3, wherein: The gearbox is further provided with a linkage shaft (8), the linkage shaft (8) is provided with a linkage gear (81) in a sleeved manner, the linkage gear (81) is in meshing engagement with a driving gear (82) fixedly arranged on the motor shaft of the second motor (2) and a driven gear (83) fixedly arranged on the first ring gear (32).

5. The dual-motor pure electric vehicle drive system of claim 1, wherein: The third planetary gear set (6) comprises a third planetary carrier (64) fixedly arranged on the gearbox and a third planetary gear (63) arranged on the third planetary carrier (64), the third planetary gear (63) is located between a third sun gear (61) and a third ring gear (62) and is in meshing engagement with the two, the third sun gear (61) is fixedly arranged on the motor shaft of the second motor (2), and the transmission assembly (7) is arranged on the third ring gear (62).

6. The dual-motor, pure electric vehicle drive system of claim 5, wherein: The transmission assembly (7) at least comprises a connecting shaft (71) fixedly arranged on the third ring gear (62), the connecting shaft (71) is fixedly provided with a driving gear (72), the second half shaft (10) is fixedly provided with a transmission gear (73), and the transmission gear (73) and the driving gear (72) are provided with an idler gear (74) in meshing engagement with the two.

7. The dual-motor pure electric vehicle drive system of claim 1, wherein: The maximum distance between the first motor (1) and the second motor (2) is the maximum height of the system.

8. The dual-motor pure electric vehicle drive system of claim 1, wherein: The first motor (1) and the second motor (2) are high-speed motors.

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