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 which 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 a first clutch and a second clutch which are connected between the driving motor and the first planetary gear train and between the driving motor and the second planetary gear train respectively. The differential mechanism comprises a differential gear, two elements with the same steering trend in the first planetary gear train and the second planetary gear train are meshed with the differential gear, the central axes of the two elements are collinear, and the differential gear is meshed with the differential gear. The drive axle housing is connected with the differential gear and is perpendicular to the central axis of the differential gear, and the brake is connected between the 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, 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, 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 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, 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 including a differential gear, two elements with the same steering trend in the first planetary gear train and the second planetary gear train are meshed with the differential gear, and the central axes of the two elements are collinear and perpendicular to the central axis of the differential gear, and a brake connected between the differential gear and the 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, the differential gear is a bevel gear, the outer surface of the ring gear is provided with a bevel gear structure meshing with the differential gear, and the ring gear of the first planetary gear train and the ring gear of the second planetary gear train are both meshed with the differential gear.

[0008] Optionally, the cone angle of the bevel gear is less than 90° or equal to 90°.

[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 the second clutch is connected between the first 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 second 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 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, and the torques received by the two elements meshing with the differential gear in the first planetary gear train and the second planetary gear train are consistent. Since the central axes of the two elements are collinear and the central axes of the two elements are perpendicular to the central axis of the differential gear, the two elements and the differential gear that are subjected to the same torque can restrain each other and remain motionless. If the vehicle turns, the rotation speeds of the left and right wheels are different, and the torques received by the above two elements are different, causing the differential gear to rotate, leading to The components with fast rotation speed are caused to rotate in the same direction as their own steering trend, and the components with slow rotation speed are caused to rotate in the opposite direction to the components with fast rotation speed, 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 gear, thereby ensuring reliable steering; when the first clutch and the second clutch are both in the semi-clutch state and the brake is in the engaged state, the above two components and the differential gear 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-clutch 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, thereby 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 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-Differential gear

[0029] 8-first reduction gear, 81-first input gear, 82-first output gear,

[0030] 9-second speed reduction mechanism, 91-second input gear, 92-second output gear. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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 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. 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 by 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; the differential mechanism 7 can include a differential gear 71, 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 differential gear 71, and the central axes of the above two elements are collinear and perpendicular to the central axis of the differential gear 71; the brake 3 can be connected between the differential gear 71 and the drive axle housing 6. Figure 1 and Figure 2 As shown, in a specific embodiment of the present disclosure, a dual-clutch transmission may be provided at the output end of the drive motor 100 , one clutch in the dual-clutch transmission may be used as the first clutch 4 , and the other clutch may be used as the second clutch 5 .

[0034] 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 gear 71 in the first planetary gear train 1 and the second planetary gear train 2 are consistent. Since the central axes of the two elements are collinear and the central axes of the two elements are perpendicular to the central axis of the differential gear 71, the two elements and the differential gear that are subjected to the same torque can restrain each other and remain motionless. 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 differential gear 71 rotates. This causes the fast-rotating element to rotate in the same direction as its own steering trend, and the slow-rotating element to rotate in the opposite direction to the fast-rotating element, thereby realizing the passive differential function, that is, the speed difference between the left wheel 101 and the right wheel 201 is converted into the rotation of the differential gear 71, ensuring reliable steering; 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 differential gear 71 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-clutching of the first clutch 4 and the second clutch 5, the torque distributed to the left half shaft 10 and the right half shaft 20 by the drive motor 100 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, thereby 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 differential gear 71 are relatively fixed to the drive axle housing, 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.

[0035] 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.

[0036] In order to make the central axes of the two elements in the first planetary gear train 1 and the second planetary gear train 2 that mesh with the differential gear 71 collinear, the central axes of the first planetary gear train 1 and the second planetary gear train 2 can be collinear, that is, the central axis of the sun gear 11 of the first planetary gear train 1 and the central axis of the sun gear 11 of the second planetary gear train 2 can be collinear.

[0037] In order to make the central axis of the above two elements perpendicular to the central axis of the differential gear 71, Figure 1 and Figure 2 As shown, the differential gear 71 may be a bevel gear, and the two elements meshing with the differential gear 71 may be the ring gear 12 of the first planetary gear train 1 and the ring gear 12 of the second planetary gear train 2, so as to facilitate the arrangement of the differential mechanism 7 and the first planetary gear train 1 and the second planetary gear train 2. The outer surface of the ring gear 12 may be provided with a bevel gear structure meshing with the differential gear 71, and the ring gear 12 of the first planetary gear train 1 and the ring gear 12 of the second planetary gear train 2 are respectively meshed with the differential gear 71 through their respective bevel gear structures.

[0038] In the specific implementation of the present disclosure, as an option, reference Figure 1 As shown, the cone angle of the bevel gear can be less than 90°, that is, the differential gear 71 can be a bevel gear idler. Figure 2 As shown, the cone angle of the bevel gear may be equal to 90°, that is, the differential gear 71 may be a flat-tooth idler gear.

[0039] In addition, reference Figure 1 As 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.

[0040] 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 and a first output gear 82, 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, and the second clutch 5 can be connected between the first output gear 82 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 first output gear 82.

[0041] 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.

[0042] 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 second 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 second 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 differential gear, wherein two elements with the same rotational direction in the first planetary gear train and the second planetary gear train are meshed with the differential gear, and the central axes of the two elements are collinear and perpendicular to the central axis of the differential gear, and The brake is connected between the differential gear and the drive axle housing.

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 differential gear is a bevel gear, and the outer surface of the ring gear is provided with a bevel gear structure meshing with the differential gear. The ring gear of the first planetary gear train and the ring gear of the second planetary gear train are both meshed with the differential gear.

4. The vehicle drive system according to claim 3, characterized in that: The cone angle of the bevel gear is less than 90° or equal to 90°.

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, The first output gear is meshed with the first input gear, the first clutch is connected between the first output gear and the first planetary gear train, and the second clutch is connected between the first 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 second 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.

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