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, a second planetary gear train, a first clutch connected between the driving motor and the first planetary gear train, a second clutch connected between the driving 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 differential mechanism comprises a first differential gear and a second differential gear which are meshed with each other, and two elements with the same steering trend in the first planetary gear train and the second planetary gear train are meshed with the first differential gear and the second differential gear respectively; and the transmission shaft is connected between one of the first differential gear and the second differential gear and the drive axle housing.

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, comprising: a drive motor, a first planetary gear train and a second planetary gear train, having the same structure, wherein 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, a first clutch connected between the drive motor and the first planetary gear train, wherein 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, a second clutch connected between the drive motor and the second planetary gear train, wherein 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, a differential mechanism, comprising a first differential gear and a second differential gear meshing with each other, wherein two elements with the same steering trend in the first planetary gear train and the second planetary gear train are meshed with the first differential gear and the second differential gear respectively, and a brake connected between one of the first differential gear and the second differential gear and a drive axle housing.

[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 is meshed with the first differential gear through the gear structure, and the ring gear of the second planetary gear train is meshed with the second differential gear through the gear structure.

[0008] Optionally, the brake is connected between the gear shaft of the first differential gear and the drive axle housing.

[0009] Optionally, the first differential gear and the second differential gear have the same number of teeth, and the tooth width of the second differential gear is greater than the tooth width of the first differential gear.

[0010] Optionally, a 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.

[0011] Optionally, the reduction mechanism includes: a first reduction 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, a second reduction gear, which is meshed with the first reduction gear, a third reduction gear, which is coaxial and fixedly connected to the second reduction gear, and a fourth reduction gear, which is meshed with the third reduction gear and is coaxial and fixedly connected to the left half shaft or the right half shaft.

[0012] Optionally, the first clutch also has a completely disengaged state, and the second clutch also has a completely disengaged state.

[0013] 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.

[0014] Optionally, the vehicle includes two sets of the vehicle drive systems, and the two sets of the vehicle drive systems are respectively used to drive the two front wheels and the two rear wheels of the vehicle.

[0015] Through the above technical solution, 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 half shaft and the right half shaft 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. At this time, if the vehicle is traveling straight, the rotation speeds of the left and right wheels are consistent, the torques received by the two elements meshing with the differential mechanism in the first planetary gear train and the second planetary gear train are consistent, the first differential gear, the second differential gear and the above two elements restrain each other and remain stationary, and if the vehicle turns, the rotation speeds of the left and right wheels are different, the torques received by the above two elements are different, causing the mutually meshing first differential gear and the second differential gear to rotate, causing the element with a faster rotation speed to move in a direction that is inconsistent with its own steering trend. The first clutch and the second clutch rotate in the same direction as the first and second clutches, 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 above two elements and the first differential gear and the second differential gear are relatively fixed to the drive axle case, 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 shafts 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 shafts, and improving the vehicle's turning performance and body stability control ability. 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 above two elements and the first differential gear and the second differential gear 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 centrally, improves working efficiency, and reduces 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 realizes 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 structural schematic diagram of a vehicle drive system in a specific implementation manner of the present disclosure.

[0019] Figure 2 It is a structural schematic diagram of a vehicle drive system in another specific implementation manner of the present disclosure.

[0020] Description of Reference Numerals

[0021] 100-drive motor, 10-left half shaft, 101-left wheel, 20-right half shaft, 201-right wheel,

[0022] 1-first planetary gear train, 11-sun gear, 12-ring gear, 13-planetary gear, 14-planet carrier,

[0023] 2- Second planetary gear train,

[0024] 3- Brake,

[0025] 4- First clutch,

[0026] 5- Second clutch,

[0027] 6-Drive axle housing,

[0028] 7- differential mechanism, 71- first differential gear, 72- second differential gear,

[0029] 8-reduction mechanism, 81-first reduction gear, 82-second reduction gear, 83-third reduction gear, 84-fourth reduction 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 1 and Figure 2 As 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 , a second clutch 5 and a differential mechanism 7 . The first planetary gear train 1 and the second planetary gear train 2 may have the same structure. The first planetary gear train 1 may 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 may 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. The first clutch 4 may be connected between the drive motor 100 and the first planetary gear train 1. The first clutch 4 may 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 may be connected between the drive motor 100 and the second planetary gear train 2. The second clutch 5 may 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. Figure 1 The specific embodiment shown in FIG. 1 is that the first clutch 4 and the second clutch 5 are arranged independently of each other. Figure 2 The specific embodiment shown is that a dual-clutch transmission is set at the output end of the drive motor 100, one clutch in the dual-clutch transmission can be used as the first clutch 4, and the other clutch can be used as the second clutch 5; the differential mechanism 7 can include a first differential gear 71 and a second differential gear 72 that are meshed with each other, and two elements with the same steering trend in the first planetary gear train 1 and the second planetary gear train 2 can be meshed with the first differential gear 71 and the second differential gear 72 respectively; the brake 3 can be connected between one of the first differential gear 71 and the second differential gear 72 and the drive axle housing 6.

[0033] Through the above technical solution, in the vehicle drive system provided by the present disclosure, 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 train 1 and the second planetary gear train 2, thereby realizing a working mode in which a single drive motor 100 drives the left and right wheels in a centralized manner. At this time, if the vehicle is traveling straight, the rotation speeds of the left wheel 101 and the right wheel 201 are consistent, and the torques received by the two elements meshing with the differential mechanism 7 in the first planetary gear train 1 and the second planetary gear train 2 are consistent. The first differential gear 71, the second differential gear 72 and the above two elements restrain each other and remain 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 above two elements are different, so that the first differential gear 71 and the second differential gear 72 meshing with each other rotate, causing the element with a faster rotation speed to rotate in the direction opposite to itself. 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 above two elements and the first differential gear 71 and the second differential gear 72 are relatively fixed to the drive axle case 6, and the passive differential function of the differential mechanism 7 is locked. By controlling the degree of semi-clutch 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 above two elements and the first differential gear 71 and the second differential gear 72 are relatively fixed to the drive axle housing 6, and the passive differential function of the differential mechanism 7 is locked. At this time, if one side of the wheel slips, the torque output by the drive motor 100 can be fully transmitted to the other side of the wheel, thereby improving the vehicle's ability to escape from difficulties. 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 in a centralized manner, improve working efficiency, and reduce 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 process between the two working modes, thereby realizing a senseless switching and improving the driving experience.

[0034] refer to Figure 1 and Figure 2As 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 the two elements with the same rotational trend in the first planetary gear train 1 and the second planetary gear train 2 with the differential mechanism 7, Figure 1 and Figure 2 As shown, 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 selected to mesh with the differential mechanism 7. Specifically, the outer peripheral surface of the ring gear 12 can be provided with a gear structure. The ring gear 12 of the first planetary gear train 1 can mesh with the first differential gear 71 through the gear structure on its outer peripheral surface, and the ring gear 12 of the second planetary gear train 2 can mesh with the second differential gear 72 through the gear structure on its outer peripheral surface, so as to facilitate the arrangement of the differential mechanism 7.

[0036] In addition, reference Figure 1 As shown, the brake 3 can be connected between the gear shaft of the first differential gear 71 and the drive axle housing 6. When the brake 3 is in an engaged state, the first differential gear 71 and the drive axle housing 6 can be relatively fixed, so that the second differential gear 72 and the two ring gears 12 are relatively fixed to the drive axle housing 6, so that the passive differential function of the differential mechanism 7 is locked.

[0037] In order to facilitate the arrangement of the differential mechanism 7, the first differential gear 71 and the second differential gear 72 can be constructed as cylindrical gears with the same number of teeth, and the tooth width of the second differential gear 72 is greater than the tooth width of the first differential gear 71, so that the second differential gear 72 can respectively mesh with the first differential gear 71 and the ring gear 12 of the second planetary gear train 2.

[0038] In addition, reference Figure 2 As shown, a reduction mechanism 8 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 reduction mechanism 8 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 reduction mechanism 8 is connected to the left half shaft 10 or the right half shaft 20.

[0039] refer to Figure 2As shown, the reduction mechanism 8 can be a two-stage reduction mechanism, specifically, the reduction mechanism 8 can include a first reduction gear 81, a second reduction gear 82, a third reduction gear 83 and a fourth reduction gear 84, wherein the first reduction gear 81 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, the second reduction gear 82 can be meshed with the first reduction gear 81 to form a first stage reduction, the third reduction gear 83 can be coaxially and fixedly connected to the second reduction gear 82, the fourth reduction gear 84 can be meshed with the third reduction gear 83 to form a second stage reduction, and the fourth reduction gear 84 can also be 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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. 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, a second clutch connected between the drive motor and the second planetary gear train, the second clutch having at least a semi-clutch state and a fully engaged state to adjust the torque transmitted from the drive motor to the right half shaft through the second planetary gear train, a differential mechanism, comprising a first differential gear and a second differential gear meshing with each other, wherein two elements with the same rotational direction in the first planetary gear train and the second planetary gear train are meshed with the first differential gear and the second differential gear respectively, and A brake is connected between one of the first differential gear and the second differential gear and the drive axle case.

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: The outer peripheral surface of the ring gear is provided with a gear structure, and the ring gear of the first planetary gear train is meshed with the first differential gear through the gear structure, and the ring gear of the second planetary gear train is meshed with the second differential gear through the gear structure.

4. The vehicle drive system according to claim 3, characterized in that: The brake is connected between the gear shaft of the first differential gear and the drive axle case.

5. The vehicle drive system according to claim 4, characterized in that: The first differential gear and the second differential gear have the same number of teeth, and the tooth width of the second differential gear is greater than the tooth width of the first differential gear.

6. The vehicle drive system according to claim 1, characterized in that: A 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.

7. The vehicle drive system according to claim 6, characterized in that: The deceleration mechanism comprises: a first reduction 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, A second reduction gear meshes with the first reduction gear, a third reduction gear coaxially and fixedly connected to the second reduction gear, and The fourth reduction gear is meshed with the third reduction gear and is coaxially and fixedly connected with the left half shaft or the right half shaft.

8. 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.

9. A vehicle, characterized in that: A vehicle drive system comprising the vehicle drive system as claimed in any one of claims 1 to 8.

10. The vehicle according to claim 9, characterized in that The vehicle comprises two sets of the vehicle driving systems, and the two sets of the vehicle driving systems are respectively used to drive the two front wheels and the two rear wheels of the vehicle.

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