Vehicle driving system and vehicle

Abstract

The vehicle driving system and the vehicle are used for solving the technical problems that a four-wheel independent driving system is low in working condition efficiency, large in left and right torque consistency control difficulty and high in cost. The vehicle driving system comprises a driving motor, a first planetary gear train and a second planetary gear train, the first planetary gear train and the second planetary gear train are of the same structure and can transmit torque output by the driving motor to a left half shaft and a right half shaft respectively, and two elements, with the same steering trend, in the first planetary gear train and the second planetary gear train are meshed with each other. One of the first planetary gear train and the second planetary gear train is connected with the drive axle housing through a brake, the first clutch is connected between the drive motor and the first planetary gear train, the second clutch is connected between the drive motor and the second planetary gear train, and the first clutch and the second clutch at least have a semi-clutch state and a complete joint state. The torque transmitted to the left half shaft by the driving motor through the first planetary gear train is adjusted, and the torque transmitted to the right half shaft by the driving motor through the second planetary gear train is adjusted.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle driving technology, and in particular, to a vehicle driving system and a vehicle. Background Art

[0002] In the related technology, the torque and speed of the four wheels of a four-wheel independent drive vehicle can be accurately controlled independently of each other, which brings a series of advantages, such as achieving smaller radius turning, assisting ESP function, assisting steering function, assisting braking function, etc., thereby improving the vehicle's handling performance. At the same time, the four motors can achieve higher power and stronger escape performance.

[0003] However, compared with the four-wheel drive system driven by two motors, the four-wheel drive system driven by four motors independently has lower operating efficiency; secondly, for the independent drive system, since there is no differential, it brings challenges to the torque consistency control of the left and right wheels of the vehicle, and the cost is also relatively high. Summary of the invention

[0004] The purpose of the present disclosure is to provide a vehicle drive system and a vehicle to solve the technical problems of low working efficiency, difficulty in left and right torque consistency control and high cost of a four-wheel independent drive system.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a vehicle drive system, including: a drive motor, a first planetary gear train and a second planetary gear train, which have the same structure, the first planetary gear train can transmit the torque output by the drive motor to the left half shaft, the second planetary gear train can transmit the torque output by the drive motor to the right half shaft, two elements with the same steering trend in the first planetary gear train and the second planetary gear train are meshed with each other, and one of them is connected to the drive axle housing through a brake, a first clutch is connected between the drive motor and the first planetary gear train, the first clutch has at least a semi-clutch state and a fully engaged state to adjust the torque transmitted by the drive motor to the left half shaft through the first planetary gear train, and a second clutch is connected between the drive motor and the second planetary gear train, the second clutch has at least a semi-clutch state and a fully engaged state to adjust the torque transmitted by the drive motor to the right half shaft through the second planetary gear train.

[0006] Optionally, the first planetary gear train and the second planetary gear train respectively include: a sun gear connected to the first clutch or the second clutch so that the drive motor inputs torque through the sun gear, a ring gear arranged coaxially with the sun gear, a planetary gear meshing between the sun gear and the ring gear, and a planetary carrier connected to the planetary gear and capable of rotating around the central axis of the sun gear to output torque to the left half shaft or the right half shaft.

[0007] Optionally, a gear structure is provided on the outer circumferential surface of the ring gear, and the ring gear of the first planetary gear train and the ring gear of the second planetary gear train are meshed with each other through the gear structure.

[0008] Optionally, the vehicle drive system also includes a brake gear, which is meshed with the gear structure of the ring gear of the first planetary gear train or the gear structure of the ring gear of the second planetary gear train, and the brake is connected between the gear shaft of the brake gear and the drive axle housing.

[0009] Optionally, the vehicle drive system also includes a first reduction mechanism connected to the output end of the drive motor, the first clutch is connected between the first reduction mechanism and the first planetary gear train, and the second clutch is connected between the first reduction mechanism and the second planetary gear train.

[0010] Optionally, the first reduction mechanism includes: a first input gear, which is coaxial and fixedly connected to the output shaft of the drive motor, a first output gear, which is meshed with the first input gear, the first clutch is connected between the first output gear and the first planetary gear train, and a second output gear, which is meshed with the first input gear, and the second clutch is connected between the second output gear and the second planetary gear train.

[0011] Optionally, a second reduction mechanism is provided between the first planetary gear train and the left half shaft and between the second planetary gear train and the right half shaft respectively.

[0012] Optionally, the second reduction mechanism includes: a second input gear, which is coaxial and fixedly connected to the output shaft of the first planetary gear train or the output shaft of the second planetary gear train, and a third output gear, which is meshed with the second input gear and is coaxial and fixedly connected to the left half shaft or the right half shaft.

[0013] Optionally, the first clutch also has a completely disengaged state, and the second clutch also has a completely disengaged state.

[0014] On the basis of the above technical solution, the present disclosure also provides a vehicle, comprising the vehicle drive system in the above technical solution.

[0015] Through the above technical scheme, in the vehicle drive system provided by the present invention, when the first clutch and the second clutch are both in a fully engaged state and the brake is in a disengaged state, the drive motor distributes equal torque to the left and right half shafts through the first planetary gear train and the second planetary gear train, thereby realizing a working mode in which a single drive motor drives the left and right wheels in a centralized manner. The two elements with the same steering trend in the first planetary gear train and the second planetary gear train are meshed with each other to form a differential mechanism. At this time, if the vehicle is moving straight, the rotation speeds of the left and right wheels are the same, and the torques received by the two meshing elements in the first planetary gear train and the second planetary gear train are the same, thereby restraining each other and keeping them stationary. If the vehicle turns, the rotation speeds of the left and right wheels are different, and the torques received by the two meshing elements in the first planetary gear train and the second planetary gear train are different, and the element with a faster rotation speed is in the direction opposite to the direction in which it is turning. The left and right wheels rotate in the same direction, and the slow-speed element rotates in the opposite direction to the fast-speed element, thereby realizing the passive differential function, that is, the speed difference between the left and right wheels is converted into the rotation of the differential mechanism, ensuring reliable steering; when the first clutch and the second clutch are both in a semi-clutch state and the brake is in an engaged state, the two elements meshing with each other in the first planetary gear train and the second planetary gear train are relatively fixed to the drive axle housing, and the passive differential function of the differential mechanism is locked. By controlling the degree of semi-clutching of the first clutch and the second clutch, the torque distributed to the left and right half-axles by the drive motor through the first planetary gear train and the second planetary gear train can be controlled, thereby realizing a working mode in which a single drive motor independently drives the left and right wheels, that is, realizing the active adjustment function of the speed and torque of the left and right half-axles, and improving the vehicle's turning performance and body stability control capabilities. In addition, when the first clutch and the second clutch are both in a fully engaged state and the brake is in an engaged state, the two meshing elements in the first planetary gear train and the second planetary gear train are relatively fixed to the drive axle housing, and the passive differential function of the differential mechanism is locked. At this time, if one side of the wheel slips, the torque output by the drive motor can be fully transmitted to the other side of the wheel, thereby improving the vehicle's ability to escape from trouble. The vehicle drive system provided by the present disclosure can realize a working mode in which a single drive motor drives the left and right wheels in a centralized manner, improve working efficiency, and reduce costs by adjusting the engagement state of the first clutch, the second clutch, and the brake, and can also realize a working mode in which a single drive motor drives the left and right wheels independently, and realize an active differential function, and the power is not interrupted during the switching process between the two working modes, thereby realizing a senseless switching and improving the driving experience. The vehicle provided by the present disclosure has the same technical effect as the vehicle drive system in the above technical solution. In order to avoid unnecessary repetition, it will not be repeated here.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the structure of a vehicle drive system in a specific implementation manner of the present disclosure.

[0019] Description of Reference Numerals

[0020] 100-drive motor, 10-left half shaft, 101-left wheel, 20-right half shaft, 201-right wheel,

[0021] 1-first planetary gear train, 11-sun gear, 12-ring gear, 13-planetary gear, 14-planet carrier,

[0022] 2- Second planetary gear train,

[0023] 3- Brake,

[0024] 4- First clutch,

[0025] 5- Second clutch,

[0026] 6-Drive axle housing,

[0027] 7-Brake gear,

[0028] 8-first reduction gear, 81-first input gear, 82-first output gear, 83-second output gear,

[0029] 9-second speed reduction mechanism, 91-second input gear, 92-third output gear. DETAILED DESCRIPTION

[0030] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0031] In the present disclosure, unless otherwise stated, directional words such as "inside" and "outside" generally refer to the inside and outside relative to the contour of the corresponding component itself. The terms "first" and "second" used in the present disclosure are to distinguish one element from another element and do not have order and importance. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0032] According to a specific embodiment of the present disclosure, a vehicle driving system is provided, referring to Figure 1As shown, the vehicle drive system may include a drive motor 100, a first planetary gear train 1, a second planetary gear train 2, a brake 3, a first clutch 4 and a second clutch 5, wherein the first planetary gear train 1 and the second planetary gear train 2 may have the same structure, the first planetary gear train 1 can transmit the torque output by the drive motor 100 to the left half shaft 10, so that the left half shaft 10 drives the left wheel 101 to rotate, the second planetary gear train 2 can transmit the torque output by the drive motor 100 to the right half shaft 20, so that the right half shaft 20 drives the right wheel 201 to rotate, and the two elements with the same steering trend in the first planetary gear train 1 and the second planetary gear train 2 are mutually rotatable. The first clutch 4 can be connected between the drive motor 100 and the first planetary gear train 1, and the first clutch 4 can have at least a semi-clutch state and a fully engaged state to adjust the torque transmitted from the drive motor 100 to the left half shaft 10 through the first planetary gear train 1. The second clutch 5 can be connected between the drive motor 100 and the second planetary gear train 2, and the second clutch 5 can have at least a semi-clutch state and a fully engaged state to adjust the torque transmitted from the drive motor 100 to the right half shaft 20 through the second planetary gear train 2.

[0033] Through the above technical solution, in the vehicle drive system provided by the present invention, by adjusting the engagement state of the first clutch 4, the second clutch 5 and the brake 3, it is possible to switch between a working mode in which a single drive motor 100 drives the left and right wheels in a centralized manner and a working mode in which a single drive motor 100 drives the left and right wheels independently. Specifically, when the first clutch 4 and the second clutch 5 are both in a fully engaged state and the brake 3 is in a disengaged state, the drive motor 100 distributes equal torque to the left half shaft 10 and the right half shaft 20 through the first planetary gear system 1 and the second planetary gear system 2, thereby realizing a working mode in which a single drive motor 100 drives the left and right wheels in a centralized manner. The two elements with the same steering trend in the first planetary gear system 1 and the second planetary gear system 2 are meshed with each other to form a differential mechanism. At this time, if the vehicle is moving straight, the rotation speeds of the left wheel 101 and the right wheel 201 are consistent, and the torques received by the two meshing elements in the first planetary gear system 1 and the second planetary gear system 2 are consistent, thereby restraining each other and keeping them stationary. If the vehicle turns, the rotation speeds of the left wheel 101 and the right wheel 201 are different, and the torques received by the two meshing elements in the first planetary gear system 1 and the second planetary gear system 2 are different, and the element with a faster rotation speed rotates in the direction of its own steering trend. When the first clutch 4 and the second clutch 5 are both in a semi-clutch state and the brake 3 is in an engaged state, the two mutually meshing elements in the first planetary gear train 1 and the second planetary gear train 2 are relatively fixed to the drive axle case 6, and the passive differential function of the differential mechanism is locked. By controlling the degree of semi-clutching of the first clutch 4 and the second clutch 5, the torque distributed by the drive motor 100 to the left half shaft 10 and the right half shaft 20 through the first planetary gear train 1 and the second planetary gear train 2 can be controlled, thereby realizing a working mode in which a single drive motor 100 independently drives the left and right wheels, that is, realizing the active adjustment function of the speed and torque of the left half shaft 10 and the right half shaft 20, and improving the vehicle's turning performance and body stability control ability. In addition, when the first clutch 4 and the second clutch 5 are both in a fully engaged state and the brake 3 is in an engaged state, the two meshing elements in the first planetary gear train 1 and the second planetary gear train 2 are relatively fixed to the drive axle housing 6, and the passive differential function of the differential mechanism is locked. At this time, if the wheels on one side slip, the torque output by the drive motor 100 can be fully transmitted to the wheels on the other side, thereby improving the vehicle's ability to escape from trouble.The vehicle drive system provided by the present disclosure can realize a working mode in which a single drive motor 100 drives the left and right wheels centrally, improves working efficiency and reduces costs, and can also realize a working mode in which a single drive motor 100 drives the left and right wheels independently, and realize an active differential function, and the power is not interrupted during the switching between the two working modes, thereby realizing seamless switching and improving the driving experience.

[0034] refer to Figure 1 As shown, the first planetary gear train 1 and the second planetary gear train 2 may include a sun gear 11, a ring gear 12, a planetary gear 13 and a planet carrier 14, respectively, wherein the sun gear 11 may be connected to the first clutch 4 or the second clutch 5, so that the drive motor 100 inputs torque through the sun gear 11, the ring gear 12 may be coaxially arranged with the sun gear 11, the planetary gear 13 may be meshed between the sun gear 11 and the ring gear 12, the planetary gear 13 may be able to revolve around the central axis of the sun gear 11 while rotating, and the planet carrier 14 may be connected to the planetary gear 13 and may be able to rotate around the central axis of the sun gear 11 to output torque to the left half shaft 10 or the right half shaft 20. That is, the drive motor 100 inputs torque through the sun gear 11 and outputs torque through the planet carrier 14.

[0035] In order to facilitate the engagement of two elements with the same steering tendency to form a differential mechanism, refer to Figure 1 As shown, the first planetary gear train 1 and the second planetary gear train 2 are arranged parallel to each other, that is, the central axis of the sun gear 11 of the first planetary gear train 1 is parallel to the central axis of the sun gear 11 of the second planetary gear train 2, and the two elements with the same steering trend in the first planetary gear train 1 and the second planetary gear train 2 can be a ring gear 12, and the outer peripheral surface of the ring gear 12 can be provided with a gear structure, that is, the ring gear 12 of the first planetary gear train 1 and the ring gear 12 of the second planetary gear train 2 can be meshed with each other through the gear structure on the outer peripheral surface, so as to form a differential mechanism.

[0036] In order to facilitate the connection between the ring gear 12 and the brake 3, the vehicle drive system may further include a brake gear 7, which may be meshed with the gear structure of the ring gear 12 of the first planetary gear train 1 or the gear structure of the ring gear 12 of the second planetary gear train 2, and the brake 3 may be connected between the gear shaft of the brake gear 7 and the drive axle housing 6. When the brake 3 is in an engaged state, the brake gear 7 and the drive axle housing 6 can be relatively fixed, so that both the ring gears 12 are relatively fixed with the drive axle housing 6, so as to lock the passive differential function of the two ring gears 12.

[0037] In addition, reference Figure 1As shown, the vehicle drive system may further include a first reduction mechanism 8 connected to the output end of the drive motor 100, a first clutch 4 may be connected between the first reduction mechanism 8 and the first planetary gear train 1, and a second clutch 5 may be connected between the first reduction mechanism 8 and the second planetary gear train 2. That is, the output end of the drive motor 100 is connected to the input end of the first reduction mechanism 8, and the first clutch 4 and the second clutch 5 may be connected in parallel to the output end of the first reduction mechanism 8.

[0038] refer to Figure 1 As shown, the first reduction mechanism 8 can be a first-stage reduction mechanism, specifically, the first reduction mechanism 8 can include a first input gear 81, a first output gear 82 and a second output gear 83, wherein the first input gear 81 can be coaxially and fixedly connected to the output shaft of the drive motor 100, the first output gear 82 can be meshed with the first input gear 81, the first clutch 4 can be connected between the first output gear 82 and the first planetary gear train 1, so that the first reduction mechanism 8 transmits torque to the first planetary gear train 1 through the first output gear 82, the second output gear 83 can be meshed with the first input gear 81, and the second clutch 5 can be connected between the second output gear 83 and the second planetary gear train 2, so that the first reduction mechanism 8 transmits torque to the second planetary gear train 2 through the second output gear 83.

[0039] In addition, a second reduction mechanism 9 may be provided between the first planetary gear train 1 and the left half shaft 10 and between the second planetary gear train 2 and the right half shaft 20. That is, the input end of the second reduction mechanism 9 is connected to the output end of the first planetary gear train 1 or the output end of the second planetary gear train 2, and the output end of the second reduction mechanism 9 is connected to the left half shaft 10 or the right half shaft 20.

[0040] refer to Figure 1 As shown, the second reduction mechanism 9 can be a first-stage reduction mechanism, specifically, the second reduction mechanism 9 can include a second input gear 91 and a third output gear 92, wherein the second input gear 91 can be coaxially and fixedly connected to the output shaft of the first planetary gear train 1 or the output shaft of the second planetary gear train 2, and the third output gear 92 can be engaged with the second input gear 91 and coaxially and fixedly connected to the left half shaft 10 or the right half shaft 20 to transmit torque to the left half shaft 10 or the right half shaft 20.

[0041] In addition, the first clutch 4 can also have a completely separated state, and the second clutch 5 can also have a completely separated state. When the vehicle is in a gliding state, the first clutch 4 and the second clutch 5 can be switched to a completely separated state, thereby preventing the wheels from dragging the drive motor 100 in the reverse direction during gliding, thereby reducing the energy consumption of the vehicle.

[0042] On the basis of the above technical solution, the present disclosure also provides a vehicle, comprising the vehicle drive system in the above technical solution.

[0043] Through the above technical solution, the vehicle provided by the present invention has the same technical effect as the vehicle drive system in the above technical solution. In order to avoid unnecessary repetition, it will not be described here.

[0044] In a specific embodiment of the present disclosure, the vehicle may include two vehicle drive systems, which can be used to drive the two front wheels and the two rear wheels of the vehicle respectively, so that both centralized driving of the four wheels and independent driving of the four wheels can be achieved through two drive motors 100.

[0045] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0047] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A vehicle drive system, characterized in that: include: Drive motor, The first planetary gear train and the second planetary gear train have the same structure. The first planetary gear train can transmit the torque output by the drive motor to the left half shaft, and the second planetary gear train can transmit the torque output by the drive motor to the right half shaft. Two elements with the same steering trend in the first planetary gear train and the second planetary gear train are meshed with each other, and one of them is connected to the drive axle housing through a brake. a first clutch connected between the drive motor and the first planetary gear train, the first clutch having at least a semi-clutch state and a fully engaged state to adjust the torque transmitted from the drive motor to the left half shaft through the first planetary gear train, and The second clutch is connected between the drive motor and the second planetary gear train, and the second clutch has at least a semi-clutch state and a fully engaged state to adjust the torque transmitted by the drive motor to the right half shaft through the second planetary gear train.

2. The vehicle drive system according to claim 1, characterized in that: The first planetary gear train and the second planetary gear train respectively include: a sun gear connected to the first clutch or the second clutch so that the drive motor inputs torque through the sun gear, a ring gear, arranged coaxially with the sun gear, a planetary gear meshing between the sun gear and the ring gear, and A planet carrier is connected to the planetary gear and can rotate around the central axis of the sun gear to output torque to the left half shaft or the right half shaft.

3. The vehicle drive system according to claim 2, characterized in that: A gear structure is disposed on the outer circumferential surface of the ring gear, and the ring gear of the first planetary gear train and the ring gear of the second planetary gear train are meshed with each other through the gear structure.

4. The vehicle drive system according to claim 3, characterized in that: The vehicle drive system also includes a brake gear, which is meshed with the gear structure of the ring gear of the first planetary gear train or the gear structure of the ring gear of the second planetary gear train, and the brake is connected between the gear shaft of the brake gear and the drive axle housing.

5. The vehicle drive system according to claim 1, characterized in that: The vehicle drive system further includes a first reduction mechanism connected to the output end of the drive motor, The first clutch is connected between the first reduction mechanism and the first planetary gear train. The second clutch is connected between the first reduction mechanism and the second planetary gear train.

6. The vehicle drive system according to claim 5, characterized in that: The first reduction mechanism comprises: The first input gear is coaxially and fixedly connected to the output shaft of the driving motor, a first output gear meshing with the first input gear, the first clutch connected between the first output gear and the first planetary gear train, and The second output gear is meshed with the first input gear, and the second clutch is connected between the second output gear and the second planetary gear train.

7. The vehicle drive system according to claim 1, characterized in that: A second reduction mechanism is provided between the first planetary gear train and the left half shaft and between the second planetary gear train and the right half shaft.

8. The vehicle drive system according to claim 7, characterized in that: The second reduction mechanism comprises: a second input gear coaxially and fixedly connected to the output shaft of the first planetary gear train or the output shaft of the second planetary gear train, The third output gear is meshed with the second input gear and is coaxially and fixedly connected to the left half shaft or the right half shaft.

9. The vehicle drive system according to claim 1, characterized in that: The first clutch also has a fully disengaged state, and the second clutch also has a fully disengaged state.

10. A vehicle, characterized in that: A vehicle drive system comprising the vehicle drive system according to any one of claims 1 to 9.

Images