A coaxial single motor drive system and vehicle

Abstract

The application relates to the technical field of driving systems, in particular to a coaxial single-motor driving system and a vehicle. The driving system comprises a driving motor, a first planetary gear set arranged on one side of the driving motor in the axial direction, a first sun gear of the first planetary gear set being in transmission connection with a motor shaft of the driving motor, a first wheel-end half shaft arranged on the same side of the driving motor in the axial direction and connected with a first planetary carrier, a second planetary gear set arranged on the other side of the driving motor in the axial direction, a second sun gear of the second planetary gear set being in transmission connection with a first ring gear, and a second wheel-end half shaft arranged on the same side of the driving motor in the axial direction and connected with the second ring gear. According to the application, the first wheel-end half shaft and the second wheel-end half shaft do not need to be arranged in the motor shaft of the driving motor, so that the size design of the motor shaft is not limited by the wheel-end half shaft.

Description

Technical Field

[0001] This application relates to the field of drive system technology, and in particular to a coaxial single-motor drive system and vehicle. Background Technology

[0002] In a coaxial single-motor drive system, the motor shaft of the input drive motor and the two output wheel-end half-shafts are coaxially arranged to improve the compactness and integration of the drive system. The drive motor in a coaxial single-motor drive system can be connected to the two wheel-end half-shafts via two planetary gear sets. Through the speed coupling effect of the two planetary gear sets, a speed difference can be created between the two wheel-end half-shafts, replacing the traditional open differential. However, existing coaxial single-motor drive systems suffer from the limitation that the size design of the drive motor shaft is constrained by the wheel-end half-shafts. Summary of the Invention

[0003] In view of the problem that the size design of the motor shaft of the drive motor in the existing coaxial single motor drive system is limited by the wheel end half shaft in the background art, this application provides a coaxial single motor drive system and vehicle.

[0004] In a first aspect, this application provides a coaxial single-motor drive system, the coaxial single-motor drive system comprising: A drive motor, which includes a motor shaft; The first planetary gear set is disposed on one side of the drive motor shaft, and the first planetary gear set includes a first sun gear, a first planet gear, a first planet carrier and a first ring gear. The first sun gear is driven to the motor shaft, the first planet gear is disposed on the first planet carrier and meshes with the first sun gear, and the first ring gear meshes with the first planet gear. The first wheel end half shaft is located on the same side of the drive motor axis as the first planetary gear set and is connected to the first planetary carrier. The second planetary gear set is located on the other side of the drive motor shaft, and the second planetary gear set includes a second sun gear, a second planet gear, a second planet carrier and a second ring gear. The second sun gear is connected to the first ring gear in a transmission manner. The second planet gear is located on the second planet carrier and meshes with the second sun gear. The second ring gear meshes with the second planet gear. The second wheel end half shaft is located on the same side of the drive motor axis as the second planetary gear set and is connected to the second gear ring.

[0005] This application allows the first planetary gear set and the first wheel end half-shaft to be located on the same side of the drive motor shaft, and the second planetary gear set and the second wheel end half-shaft to be located on the other side of the drive motor shaft. This eliminates the need for the first wheel end half-shaft and the second wheel end half-shaft to be inserted into the drive motor shaft, thus the size design of the motor shaft is not limited by the wheel end half-shaft.

[0006] In one embodiment, the motor shaft is hollow, and a drive shaft is provided on the first gear ring. The drive shaft passes through the motor shaft and is connected to the second sun gear.

[0007] In one embodiment, the first gear ring and the second sun gear are connected by a drive shaft, and the drive shaft is inserted into the motor shaft to facilitate the transmission between the first gear ring and the second sun gear. As a transmission structure between the two planetary gear sets, the size of the drive shaft can be relatively small compared to the first and second wheel end half shafts, thereby reducing the impact on the design of the motor shaft size.

[0008] In one embodiment, the first planetary gear includes a first planetary gear one and a first planetary gear two, the first planetary gear one and the first planetary gear two are coaxially arranged, the first planetary gear one meshes with the first sun gear, and the first planetary gear two meshes with the first gear ring.

[0009] In one embodiment, by setting the first planetary gear as a first planetary gear one that is coaxially arranged and meshes with the first sun gear and a first planetary gear two that meshes with the first ring gear, the speed ratio range of the first planetary gear set can be expanded, the structural compactness and load-bearing capacity of the first planetary gear set can be improved, and the transmission effect of the first planetary gear set can be optimized.

[0010] In one embodiment, the pitch circle diameter of the first planetary gear is larger than the pitch circle diameter of the second planetary gear.

[0011] In one embodiment, by setting the pitch circle diameter of the first planetary gear one to be larger than that of the first planetary gear two, the size of the first sun gear can be made larger under the same magnification ratio, thereby reducing the impact on the size design of the first sun gear when the drive shaft passes through the first sun gear; and the size of the first gear ring can be made smaller, thereby reducing the envelope size of the drive system.

[0012] In one embodiment, a first planetary shaft is provided on the first planetary carrier, and the first planetary gear one and the first planetary gear two are both provided on the first planetary carrier via the first planetary shaft.

[0013] In one embodiment, by arranging both the first planetary gear one and the first planetary gear two on the first planetary axis of the first planetary carrier, it is easy to achieve the coaxial arrangement of the first planetary gear one and the first planetary gear two.

[0014] In one embodiment, the second planetary gear includes a second planetary gear one and a second planetary gear two, the second planetary gear one and the second planetary gear two are coaxially arranged, the second planetary gear one meshes with the second sun gear, and the second planetary gear two meshes with the second gear ring.

[0015] In one embodiment, by setting the second planetary gear as a second planetary gear one that is coaxially arranged and meshes with the second sun gear and a second planetary gear two that meshes with the second ring gear, the speed ratio range of the second planetary gear set can be expanded, the structural compactness and load-bearing capacity of the second planetary gear set can be improved, and the transmission effect of the second planetary gear set can be optimized.

[0016] In one embodiment, the pitch circle diameter of the second planetary gear one is smaller than the pitch circle diameter of the second planetary gear two.

[0017] In one embodiment, by setting the pitch circle diameter of the second planetary gear one to be smaller than that of the second planetary gear two, the size of the second sun gear and the gear ring of the second ring gear can be made smaller under the same magnification ratio, thereby reducing the envelope size of the drive system.

[0018] In one embodiment, a second planetary shaft is provided on the second planetary carrier, and the first second planetary gear and the second second planetary gear are both provided on the second planetary carrier via the second planetary shaft.

[0019] In one embodiment, by arranging both the second planetary gear one and the second planetary gear two on the second planetary axis of the second planetary carrier, it is easy to achieve the coaxial arrangement of the second planetary gear one and the second planetary gear two.

[0020] In one embodiment, the coaxial single-motor drive system includes a housing, to which the second planetary carrier is fixedly connected.

[0021] In one embodiment, by fixing the second planetary carrier to the housing, the second planetary carrier can be fixed relative to the housing and cannot rotate. When the power flow is transmitted to the second planetary gear, the power flow can only be transmitted to the second gear end half shaft through the second gear ring, and cannot be diverted through the second planetary carrier, so as to avoid the loss of power flow.

[0022] Secondly, this application provides a vehicle, which includes any of the coaxial single-motor drive systems provided in this application.

[0023] This application has at least the following advantages compared to the prior art: The aforementioned coaxial single-motor drive system allows the first planetary gear set and the first wheel end half-shaft to be located on the same side of the drive motor axis, while the second planetary gear set and the second wheel end half-shaft can be located on the other side of the drive motor axis. This eliminates the need for the first wheel end half-shaft and the second wheel end half-shaft to pass through the drive motor shaft, thus ensuring that the size design of the motor shaft is not limited by the wheel end half-shaft. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the coaxial single-motor drive system in Example 1; Figure 2 This is a schematic diagram of the coaxial single-motor drive system in Embodiment 2; Figure 3 This is a schematic diagram of the coaxial single-motor drive system in Embodiment 3; Figure 4 This is a schematic diagram of the coaxial single-motor drive system in Example 4.

[0025] Reference numerals in the attached diagram: 1. Drive motor; 1-1. Motor shaft; 2. First planetary gear set; 2-1. First sun gear; 2-2. First planet gear; 2-2-1. First planet gear one; 2-2-2. First planet gear two; 2-3. First planet carrier; 2-3-1. First planetary shaft; 2-4. First gear ring; 2-4-1. Drive shaft; 3. Second planetary gear set; 3-1. Second sun gear; 3-2. Second planet gear; 3-2-1. Second planet gear one; 3-2-2. Second planet gear two; 3-3. Second planet carrier; 3-3-1. Second planetary shaft; 3-4. Second gear ring; 4. First wheel end half-shaft; 5. Second wheel end half-shaft. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] As described in the background section, in existing coaxial single-motor drive systems, the drive motor can be connected to two wheel-end half-shafts via two planetary gear sets. Specifically, the motor shaft of the drive motor can be connected to the first sun gear of the first planetary gear set, the first planet carrier of the first planetary gear set can be connected to the first wheel-end half-shaft, the first ring gear of the first planetary gear set can be connected to the second sun gear of the second planetary gear set, and the second ring gear of the second planetary gear set can be connected to the second wheel-end half-shaft. Through the speed coupling effect of the first and second planetary gear sets, a speed difference between the first and second wheel-end half-shafts can be achieved, replacing the open differential transmission. However, in the aforementioned drive system, the first and second planetary gear sets are typically arranged on the same side of the drive motor shaft. During this arrangement, one wheel-end half-shaft needs to pass through the motor shaft. However, as the axle connecting to the vehicle wheel end, the wheel-end half-shaft needs to be relatively large to have a relatively strong load-bearing capacity. Its placement within the motor shaft correspondingly limits the size design of the motor shaft.

[0028] Example 1 To address the aforementioned problems, Embodiment 1 of this application provides a coaxial single-motor drive system, such as... Figure 1 As shown, the coaxial single-motor drive system includes: Drive motor 1, which includes motor shaft 1-1; The first planetary gear set 2 is disposed on one side of the drive motor 1 along the axis, and the first planetary gear set 2 includes a first sun gear 2-1, a first planet gear 2-2, a first planet carrier 2-3 and a first ring gear 2-4. The first sun gear 2-1 is connected to the motor shaft 1-1 for transmission. The first planet gear 2-2 is disposed on the first planet carrier 2-3 and meshes with the first sun gear 2-1. The first ring gear 2-4 meshes with the first planet gear 2-2. The first wheel end half shaft 4 is located on the same side of the drive motor 1 axis as the first planetary gear 2 and is connected to the first planetary carrier 2-3; The second planetary gear set 3 is located on the other side of the drive motor 1 axial direction, and the second planetary gear set 3 includes a second sun gear 3-1, a second planet gear 3-2, a second planet carrier 3-3, and a second ring gear 3-4. The second sun gear 3-1 is connected to the first ring gear 2-4 in a transmission connection. The second planet gear 3-2 is located on the second planet carrier 3-3 and meshes with the second sun gear 3-1. The second ring gear 3-4 meshes with the second planet gear 3-2. The second wheel end half shaft 5 is located on the same side of the drive motor 1 axis as the second planetary gear set 3 and is connected to the second gear ring 3-4.

[0029] like Figure 1As shown in this embodiment, by way of example, the first wheel end half-shaft 4 and the second wheel end half-shaft 5 can be connected to the wheel ends on the left and right sides of the vehicle, respectively, to drive the two wheel ends of the vehicle to rotate. This embodiment takes the first wheel end half-shaft 4 as the wheel end half-shaft of the left wheel end of the vehicle and the second wheel end half-shaft 5 as the wheel end half-shaft of the right wheel end of the vehicle as an example. The drive motor 1 can be connected to the first wheel end half-shaft 4 and the second wheel end half-shaft 5 via the first planetary gear set 2 and the second planetary gear set 3. The first planetary gear set 2 is mainly used to split the power flow of the drive motor 1 and transmit a portion of the power flow to the first wheel end half-shaft 4, while the second planetary gear set 3 is mainly used to transmit the remaining power flow to the second wheel end half-shaft 5. It is not difficult to see that when the first wheel end half-shaft 4 and the first planetary gear set 2 are located on the same side of the drive motor 1's axial direction, the first wheel end half-shaft 4 can extend to the left in a direction away from the drive motor 1 to connect with the left wheel end. Similarly, when the second wheel end half shaft 5 and the second planetary gear 3 are both located on the other side of the drive motor 1 axial direction, the second wheel end half shaft 5 can extend to the right in a direction away from the drive motor 1 to connect with the right wheel end.

[0030] like Figure 1 As shown, in this embodiment, when the drive motor 1 is operating, the motor shaft 1-1 rotates, and the motor shaft 1-1 can drive the first sun gear 2-1 to rotate. The first sun gear 2-1 can drive the first planet gear 2-2 to rotate, and the first planet gear 2-2 can drive the first planet carrier 2-3 to rotate coaxially. The first planet carrier 2-3 can drive the first wheel end half-shaft 4 to rotate. The first planet gear 2-2 can drive the first gear ring 2-4 to rotate, and the first gear ring 2-4 can drive the second planet gear 3-2 to rotate. The second planet gear 3-2 can drive the second gear ring 3-4 to rotate, and the second gear ring 3-4 can drive the second wheel end half-shaft 5 to rotate. When the vehicle is traveling straight, the first wheel end half-shaft 4 and the second wheel end half-shaft 5 rotate at the same speed. When the vehicle is turning, the first wheel end half-shaft 4 and the second wheel end half-shaft 5 are differentially connected.

[0031] It is understood that by setting the first planetary gear set 2 and the first wheel end half shaft 4 on the same side of the drive motor 1 axis, and setting the second planetary gear set 3 and the second wheel end half shaft 5 on the other side of the drive motor 1 axis, this application allows the first wheel end half shaft 4 and the second wheel end half shaft 5 to be installed inside the motor shaft 1-1 of the drive motor 1, and thus the size design of the motor shaft 1-1 is not limited by the wheel end half shaft.

[0032] Specifically, the motor shaft 1-1 is hollow, and the first gear ring 2-4 is provided with a transmission shaft 2-4-1, which passes through the motor shaft 1-1 and connects to the second sun gear 3-1.

[0033] like Figure 1As shown in this embodiment, by way of example, the first gear ring 2-4 can be connected to the second sun gear 3-1 via a drive shaft 2-4-1, so that the rotation of the first gear ring 2-4 can drive the rotation of the second sun gear 3-1. Specifically, one end of the drive shaft 2-4-1 can pass through the first gear ring 2-4 and be connected to the first gear ring 2-4 via a connecting structure such as an involute spline, and the other end of the drive shaft 2-4-1 can pass through the second sun gear 3-1 and be connected to the second sun gear 3-1 via a connecting structure such as an involute spline. When the drive shaft 2-4-1 is connected to the first gear ring 2-4 and the second sun gear 3-1, it can pass through the motor shaft 1-1.

[0034] It is understood that in this embodiment, the first gear ring 2-4 and the second sun gear 3-1 are connected by a drive shaft 2-4-1, and the drive shaft 2-4-1 is inserted inside the motor shaft 1-1 to facilitate the transmission between the first gear ring 2-4 and the second sun gear 3-1. As a transmission structure between the two planetary gear sets, the size of the drive shaft 2-4-1 can be relatively small compared to the first wheel end half shaft 4 and the second wheel end half shaft 5, thereby reducing the impact on the size design of the motor shaft 1-1.

[0035] Specifically, the coaxial single motor drive system includes a housing, and the second planetary carrier 3-3 is fixedly connected to the housing.

[0036] like Figure 1 As shown in this embodiment, the housing can be an integrated housing. The motor shaft 1-1 of the drive motor 1, as well as the first planetary gear set 2 and the second planetary gear set 3, can all be arranged inside the housing. The first wheel end half-shaft 4 can extend into the housing and connect to the first planetary carrier 2-3, and the second wheel end half-shaft 5 can extend into the housing and connect to the second gear ring 3-4. The second planetary carrier 3-3 can be fixed to the housing, that is, the second planetary carrier 3-3 remains stationary relative to the housing of the drive assembly. The second planetary carrier 3-3 is a fixed component and cannot rotate. The second planetary carrier 3-3 can be connected to the housing by splines, pins, or interference fits to achieve its static constraint.

[0037] It is understood that by fixing the second planetary carrier 3-3 to the housing in this embodiment, the second planetary carrier 3-3 can be fixed relative to the housing and cannot rotate. When the power flow is transmitted to the second planetary gear 3-2, the power flow can only be transmitted to the second gear end half shaft 5 through the second gear ring 3-4, and cannot be diverted through the second planetary carrier 3-3, so as to avoid the loss of power flow.

[0038] The implementation principle of the coaxial single motor drive system provided in Embodiment 1 of this application is as follows: When drive motor 1 is operating, motor shaft 1-1 rotates, driving the first sun gear 2-1 to rotate. The first sun gear 2-1 drives the first planetary gear 2-2 to rotate, which in turn drives the first planetary carrier 2-3 to rotate coaxially. The first planetary carrier 2-3 drives the first wheel end half-shaft 4 to rotate. The first planetary gear 2-2 drives the first ring gear 2-4 to rotate, which in turn drives the second planetary gear 3-2 to rotate. The second planetary gear 3-2 drives the second ring gear 3-4 to rotate, which in turn drives the second wheel end half-shaft 5 to rotate. When the vehicle is traveling straight, the first wheel end half-shaft 4 and the second wheel end half-shaft 5 rotate at the same speed. When the vehicle is turning, the first wheel end half-shaft 4 and the second wheel end half-shaft 5 are differentially connected.

[0039] This application allows the first planetary gear set 2 and the first wheel end half shaft 4 to be arranged on the same side of the drive motor 1 axis, and the second planetary gear set 3 and the second wheel end half shaft 5 to be arranged on the other side of the drive motor 1 axis. This eliminates the need for the first wheel end half shaft 4 and the second wheel end half shaft 5 to pass through the motor shaft 1-1 of the drive motor 1, thus the size design of the motor shaft 1-1 is not limited by the wheel end half shaft.

[0040] Embodiment 1 of this application also provides a vehicle, which includes any of the coaxial single motor drive systems provided in this application.

[0041] Example 2 Embodiment 2 of this application provides a coaxial single-motor drive system, such as Figure 2 As shown, the difference between this embodiment and Embodiment 1 lies at least in the structure of the first planetary gear 2-2.

[0042] Specifically, the first planetary gear 2-2 includes a first planetary gear 1 2-2-1 and a first planetary gear 2-2-2. The first planetary gear 1 2-2-1 and the first planetary gear 2-2-2 are coaxially arranged. The first planetary gear 1 2-2-1 meshes with the first sun gear 2-1, and the first planetary gear 2-2-2 meshes with the first gear ring 2-4.

[0043] like Figure 2 As shown in this embodiment, by way of example, the first planetary gear 2-2-1 and the first planetary gear 2-2-2 can both be mounted on the first planetary carrier 2-3, and the first planetary gear 2-2-1 and the first planetary gear 2-2-2 can be coaxially arranged. The first planetary carrier 2-3 can be arranged on the side of the first planetary gear 2-2-1 away from the first planetary gear 2-2-2. When the power flow of the drive motor 1 is transmitted to the first sun gear 2-1, the power flow can be transmitted through the first planetary gear 2-2-1 to the first planetary carrier 2-3, and then sequentially through the first planetary gear 2-2-1 and the first planetary gear 2-2-2 to the first ring gear 2-4.

[0044] It is understood that by setting the first planetary gear 2-2 as a first planetary gear 2-2-1 that is coaxially arranged and meshes with the first sun gear 2-1 and the first planetary gear 2-2-2 that meshes with the first gear ring 2-4, the speed ratio range of the first planetary gear set 2 can be expanded, the structural compactness and load-bearing capacity of the first planetary gear set 2 can be improved, and the transmission effect of the first planetary gear set 2 can be optimized.

[0045] More specifically, the pitch circle diameter of the first planetary gear 2-2-1 is larger than the pitch circle diameter of the first planetary gear 2-2-2.

[0046] like Figure 2 As shown in this embodiment, it is illustrated by way of example that the first sun gear 2-1 meshes with the larger planet gear, and the first gear ring 2-4 meshes with the smaller planet gear. That is, the first planet gear 2-2-1 can be larger than the first planet gear 2-2-2. Specifically, the pitch circle diameter of the first planet gear 2-2-1 can be larger than the pitch circle diameter of the first planet gear 2-2-2.

[0047] It is understood that by setting the pitch circle diameter of the first planetary gear 2-2-1 to be larger than that of the first planetary gear 2-2-2, this embodiment can make the size of the first sun gear 2-1 larger under the same magnification ratio, thereby reducing the impact of the drive shaft 2-4-1 passing through the first sun gear 2-1 on the size design of the first sun gear 2-1; and make the size of the first gear ring 2-4 smaller, so as to reduce the envelope size of the drive system.

[0048] Specifically, a first planetary axis 2-3-1 is provided on the first planetary carrier 2-3, and the first planetary gear 1 2-2-1 and the first planetary gear 2-2-2 are both provided on the first planetary carrier 2-3 through the first planetary axis 2-3-1.

[0049] like Figure 2 As shown in this embodiment, by way of example, the first planetary shaft 2-3-1 can be fixedly connected to the first planetary carrier 2-3, and the first planetary gear 1 2-2-1 and the first planetary gear 2-2-2 can be sequentially sleeved on the first planetary shaft 2-3-1. The first planetary gear 1 2-2-1 and the first planetary gear 2-2-2 can both be connected to the first planetary shaft 2-3-1 through a connecting structure such as an involute spline, so that the first planetary gear 1 2-2-1 and the first planetary gear 2-2-2 rotate at the same speed and drive the first planetary carrier 2-3 to rotate synchronously.

[0050] It is understood that in this embodiment, by arranging both the first planetary gear 2-2-1 and the first planetary gear 2-2-2 on the first planetary shaft 2-3-1 of the first planetary carrier 2-3, it is convenient to achieve the coaxial arrangement of the first planetary gear 2-2-1 and the first planetary gear 2-2-2.

[0051] The implementation principle of Embodiment 2 of this application is basically the same as that of Embodiment 1, and will not be described in detail here.

[0052] Example 3 Embodiment 3 of this application provides a coaxial single-motor drive system, such as Figure 3 As shown, the difference between this embodiment and Embodiment 1 lies at least in the structure of the second planetary gear 3-2.

[0053] Specifically, the second planetary gear 3-2 includes a first second planetary gear 3-2-1 and a second second planetary gear 3-2-2. The first second planetary gear 3-2-1 and the second second planetary gear 3-2-2 are coaxially arranged. The first second planetary gear 3-2-1 meshes with the second sun gear 3-1, and the second second planetary gear 3-2-2 meshes with the second gear ring 3-4.

[0054] like Figure 3 As shown in this embodiment, by way of example, the second planetary gear 3-2-1 and the second planetary gear 3-2-2 can both be mounted on the second planetary carrier 3-3, and the second planetary gear 3-2-1 and the second planetary gear 3-2-2 can be coaxially arranged. When the power flow of the drive motor 1 is transmitted to the second sun gear 3-1, the power flow can be transmitted sequentially through the second planetary gear 3-2-1 and the second planetary gear 3-2-2 to the second ring gear 3-4.

[0055] It is understood that by setting the second planetary gear 3-2 as a second planetary gear 3-2-1 that is coaxially arranged and meshes with the second sun gear 3-1 and the second planetary gear 3-2-2 that meshes with the second ring gear 3-4, the speed ratio range of the second planetary gear set 3 can be expanded, the structural compactness and load-bearing capacity of the second planetary gear set 3 can be improved, and the transmission effect of the second planetary gear set 3 can be optimized.

[0056] More specifically, the pitch circle diameter of the second planetary gear 3-2-1 is smaller than that of the second planetary gear 3-2-2.

[0057] like Figure 3 As shown in this embodiment, it is illustrated by way of example that the second sun gear 3-1 meshes with the smaller planet gear, and the second gear ring 3-4 meshes with the larger planet gear. That is, the second planet gear 3-2-1 can be smaller than the second planet gear 3-2-2. Specifically, the pitch circle diameter of the second planet gear 3-2-1 can be smaller than the pitch circle diameter of the second planet gear 3-2-2.

[0058] It is understood that by setting the pitch circle diameter of the second planetary gear 3-2-1 to be smaller than that of the second planetary gear 3-2-2, this embodiment can make the size of the second sun gear 3-1 smaller and the gear ring of the second gear ring 3-4 smaller under the same magnification ratio, thereby reducing the envelope size of the drive system.

[0059] More specifically, a second planetary axis 3-3-1 is provided on the second planetary carrier 3-3, and the second planetary gear 3-2-1 and the second planetary gear 3-2-2 are both provided on the second planetary carrier 3-3 via the second planetary axis 3-3-1.

[0060] like Figure 3 As shown in this embodiment, by way of example, the second planetary shaft 3-3-1 can be fixedly connected to the second planetary carrier 3-3, and the second planetary gear 3-2-1 and the second planetary gear 3-2-2 can be sequentially sleeved on the second planetary shaft 3-3-1. The second planetary gear 3-2-1 and the second planetary gear 3-2-2 can both be connected to the second planetary shaft 3-3-1 through a connecting structure such as an involute spline, so that the second planetary gear 3-2-1 and the second planetary gear 3-2-2 rotate at the same speed and drive the second planetary carrier 3-3 to rotate synchronously.

[0061] It is understood that in this embodiment, by arranging both the second planetary gear 3-2-1 and the second planetary gear 3-2-2 on the second planetary carrier 3-3's second planetary shaft 3-3-1, it is easy to achieve the coaxial arrangement of the second planetary gear 3-2-1 and the second planetary gear 3-2-2.

[0062] The implementation principle of Embodiment 3 of this application is basically the same as that of Embodiment 1, and will not be described in detail here.

[0063] Example 4 Embodiment 4 of this application provides a coaxial single-motor drive system, such as Figure 4 As shown, the difference between this embodiment and Embodiment 1 lies in the structure of the first planetary gear 2-2 and the second planetary gear 3-2. Specifically, the structure of the first planetary gear 2-2 in Embodiment 4 can refer to the structure of the first planetary gear 2-2 in Embodiment 2, and the structure of the second planetary gear 3-2 in Embodiment 4 can refer to the structure of the second planetary gear 3-2 in Embodiment 3. The implementation principle of Embodiment 4 of this application is basically the same as that of Embodiment 1, and will not be described in detail here. The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A coaxial single-motor drive system, characterized in that, The coaxial single-motor drive system includes: A drive motor (1) includes a motor shaft (1-1). The first planetary gear set (2) is disposed on one side of the drive motor (1) axial direction, and the first planetary gear set (2) includes a first sun gear (2-1), a first planet gear (2-2), a first planet carrier (2-3) and a first ring gear (2-4). The first sun gear (2-1) is connected to the motor shaft (1-1) for transmission. The first planet gear (2-2) is disposed on the first planet carrier (2-3) and meshes with the first sun gear (2-1). The first ring gear (2-4) meshes with the first planet gear (2-2). The first wheel end half shaft (4) is located on the same side of the drive motor (1) axis as the first planetary gear set (2) and is connected to the first planetary carrier (2-3); The second planetary gear set (3) is located on the other side of the drive motor (1) axial direction. The second planetary gear set (3) includes a second sun gear (3-1), a second planet gear (3-2), a second planet carrier (3-3), and a second ring gear (3-4). The second sun gear (3-1) is connected to the first ring gear (2-4) in a transmission manner. The second planet gear (3-2) is located on the second planet carrier (3-3) and meshes with the second sun gear (3-1). The second ring gear (3-4) meshes with the second planet gear (3-2). The second wheel end half shaft (5) is located on the same side of the drive motor (1) axial direction as the second planetary gear set (3) and is connected to the second gear ring (3-4).

2. The coaxial single-motor drive system according to claim 1, characterized in that, The motor shaft (1-1) is hollow, and a transmission shaft (2-4-1) is provided on the first gear ring (2-4). The transmission shaft (2-4-1) passes through the motor shaft (1-1) and is connected to the second sun gear (3-1).

3. The coaxial single-motor drive system according to claim 1, characterized in that, The first planetary gear (2-2) includes a first planetary gear one (2-2-1) and a first planetary gear two (2-2-2). The first planetary gear one (2-2-1) and the first planetary gear two (2-2-2) are coaxially arranged. The first planetary gear one (2-2-1) meshes with the first sun gear (2-1), and the first planetary gear two (2-2-2) meshes with the first gear ring (2-4).

4. The coaxial single-motor drive system according to claim 3, characterized in that, The pitch circle diameter of the first planetary gear (2-2-1) is larger than that of the first planetary gear (2-2-2).

5. The coaxial single-motor drive system according to claim 3, characterized in that, The first planetary carrier (2-3) is provided with a first planetary shaft (2-3-1), and the first planetary gear one (2-2-1) and the first planetary gear two (2-2-2) are both provided on the first planetary carrier (2-3) through the first planetary shaft (2-3-1).

6. The coaxial single-motor drive system according to claim 1, characterized in that, The second planetary gear (3-2) includes a second planetary gear one (3-2-1) and a second planetary gear two (3-2-2). The second planetary gear one (3-2-1) and the second planetary gear two (3-2-2) are coaxially arranged. The second planetary gear one (3-2-1) meshes with the second sun gear (3-1), and the second planetary gear two (3-2-2) meshes with the second gear ring (3-4).

7. The coaxial single-motor drive system according to claim 6, characterized in that, The pitch circle diameter of the second planetary gear one (3-2-1) is smaller than that of the second planetary gear two (3-2-2).

8. The coaxial single-motor drive system according to claim 6, characterized in that, The second planetary carrier (3-3) is provided with a second planetary shaft (3-3-1), and the second planetary gear one (3-2-1) and the second planetary gear two (3-2-2) are both provided on the second planetary carrier (3-3) through the second planetary shaft (3-3-1).

9. The coaxial single-motor drive system according to claim 1, characterized in that, The coaxial single motor drive system includes a housing, and the second planetary carrier (3-3) is fixedly connected to the housing.

10. A vehicle, characterized in that, The vehicle includes a coaxial single-motor drive system as described in any one of claims 1-9.

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