Transmission device, driving system and vehicle

Abstract

According to the transmission device, the driving system and the vehicle, a first output shaft and a second output shaft are coaxially arranged in a planet carrier in a spaced mode, a first input shaft and a second input shaft are arranged on the first output shaft and the second output shaft in a sleeving mode respectively, and a first planet gear and a second planet gear which are in transmission connection with the first input shaft and the second input shaft respectively are arranged in the planet carrier; the second input shaft drives the planet carrier to rotate through the second planet gear, and then the two output shafts are driven to rotate synchronously. The first planetary gear and the first output gear are in primary transmission, the first planetary gear and the second output gear are in transmission connection through the third planetary gear to form secondary transmission, rotation of the first planetary gear is controlled through the first input shaft, the speed difference between the first output shaft and the second output shaft can be adjusted, and torque adjustment is achieved. According to the transmission device, the driving system and the vehicle provided by the invention, the complexity of torque deployment control can be effectively reduced, and the implementation difficulty of a torque vector distribution technology of a new energy automobile is reduced.

Description

Technical Field

[0001] The present invention relates to the field of automobile drive technology, and in particular to a transmission device, a drive system and a vehicle. Background Art

[0002] In order to effectively improve the handling and stability of new energy vehicles, the system is required to intelligently distribute torque to different wheels according to the vehicle's driving conditions and the driver's operation.

[0003] For example, when turning, the system can provide more torque to the outer wheels to help the vehicle better cope with high-speed turns; in different off-road situations, the system can send torque to the wheels with better grip to ensure that the vehicle can pass through rugged terrain stably. Since torque allocation can effectively improve the driving experience, more and more automakers are developing new energy vehicles with torque vectoring function.

[0004] At present, most new energy vehicles on the market with torque vector distribution technology use two motors to control the torque and power of the wheels on both sides respectively. This solution has high motor costs, and the control and operating status of the two motors need to be monitored in real time, and the software control is complex. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a transmission device, a drive system and a vehicle to solve the problems of high cost and complex software control of torque vector distribution technology for new energy vehicles in the prior art.

[0006] In one aspect, the present invention provides a transmission device, comprising: a first output shaft and a second output shaft coaxially spaced apart in a planet carrier, and a first input shaft and a second input shaft rotatably sleeved on the first output shaft and the second output shaft, respectively, wherein:

[0007] The planet carrier is provided with a first planetary gear and a second planetary gear respectively connected to the first input shaft and the second input shaft, and the second planetary gear is used to drive the planet carrier to rotate according to the input power of the second input shaft;

[0008] The planet carrier is also provided with a third planetary gear, the first output shaft and the second output shaft are respectively fixedly provided with a first output gear and a second output gear, the first planetary gear is a multi-linked gear, and the two gear structures in the first planetary gear are respectively meshed and connected with the first output gear, and are meshed and connected with the second output gear through the third planetary gear;

[0009] The first input shaft is used to control the rotation of the first planetary gear, so that when the second input shaft drives the planetary carrier to rotate through the second planetary gear, the speed difference between the first output shaft and the second output shaft is adjusted by adjusting the rotation speed of the first planetary gear.

[0010] Optionally, an inner planetary carrier is rotatably arranged on the first input shaft, and the inner planetary carrier is transmission connected to the first planetary gear. A fourth planetary gear is arranged on the inner planetary carrier, and the fourth planetary gear is transmission connected to the first input shaft. The fourth planetary gear is also meshingly connected to the first ring gear. The first ring gear is fixedly arranged on an external fixing member, and the planetary carrier can rotate relative to the external fixing member.

[0011] Optionally, the orbital radius of the first planetary gear is greater than the orbital radius of the second planetary gear. Optionally, the orbital radius of the third planetary gear is less than the orbital radius of the second planetary gear.

[0012] Optionally, the second planetary gear is a double gear, one gear structure in the second planetary gear is meshingly connected with the second ring gear, the other gear structure in the second planetary gear is drivingly connected with the second input shaft, the second ring gear is fixed on an external fixing member, and the planet carrier can rotate relative to the external fixing member.

[0013] The present invention also provides a driving system, comprising the above-mentioned transmission device, and a first motor and a second motor, wherein the first motor is used to drive the first input shaft, and the second motor is used to drive the second input shaft.

[0014] Optionally, the rated power of the first motor is less than the rated power of the second motor.

[0015] Optionally, the first output shaft and the second output shaft are also drivingly connected to the wheel axle via a coupling respectively.

[0016] The present invention also provides a vehicle, comprising the above-mentioned driving system.

[0017] The transmission device provided by the present invention comprises: a first output shaft and a second output shaft coaxially arranged in a planetary carrier at intervals, and a first input shaft and a second input shaft respectively rotatably sleeved on the first output shaft and the second output shaft, wherein the planetary carrier is provided with a first planetary gear and a second planetary gear respectively connected to the first input shaft and the second input shaft in a transmission manner, and the second planetary gear is used to drive the planetary carrier to rotate according to the input power of the second input shaft; the planetary carrier is also provided with a third planetary gear, and the first output shaft and the second output shaft are respectively fixedly provided with a first output gear and a second output gear, the first planetary gear is a multi-link gear, and two gears in the first planetary gear are connected to each other. The first input shaft is mainly used to control the rotation of the first planetary gear. When the first planetary gear rotates, the transmission between the first planetary gear and the second output gear is through the third planetary gear, forming a two-stage transmission, so that when the output power of the first input shaft is transmitted to the first output shaft and the second output shaft, the driving direction is opposite, so that when the second input shaft drives the planetary carrier to rotate through the second planetary gear, the speed difference between the first output shaft and the second output shaft can be adjusted by adjusting the rotation speed and rotation direction of the first planetary gear to achieve the steering requirement. When the vehicle is traveling in a straight line, the drive device provided by the present invention only needs to use one motor to drive the second input shaft to achieve the same speed operation of the two output shafts. When the torque of the two output shafts needs to be adjusted to achieve vehicle steering or grip control, another motor is enabled to drive the first input shaft, so that the torque of the two output shafts can be effectively adjusted, which can effectively reduce the complexity of torque vector distribution control and reduce the difficulty of realizing torque vector distribution technology for new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the main structure of the drive system in the embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a differential-related structure of a transmission device in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the main power input structure of the transmission device in the embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the differential control structure of the transmission device in an embodiment of the present invention.

[0022] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] In order to solve the problems of high cost and complex software control of torque vector distribution technology for new energy vehicles in the prior art, the present invention provides a transmission device, in which a first output shaft and a second output shaft are coaxially arranged at intervals in a planetary carrier, and a first input shaft and a second input shaft are respectively sleeved thereon, and a first planetary gear and a second planetary gear are respectively provided in the planetary carrier, which are respectively connected to the first input shaft and the second input shaft in a transmission manner, the second input shaft drives the planetary carrier to rotate through the second planetary gear, and then drives the two output shafts to rotate synchronously through the planetary carrier and the first planetary gear. Among them, the first planetary gear and the first output gear form a primary transmission, and are connected to the second output gear through a third planetary gear transmission to form a secondary transmission. The rotation of the first planetary gear is controlled by the first input shaft, and the speed difference between the first output shaft and the second output shaft is adjusted to achieve torque allocation. When the vehicle is traveling in a straight line, only one motor is needed to drive the second input shaft to achieve the same speed operation of the two output shafts. When the torque of the two output shafts needs to be allocated to achieve vehicle steering or grip control, another motor is enabled to drive the first input shaft, so as to effectively allocate the torque of the two output shafts, which can effectively reduce the complexity of torque allocation control and reduce the difficulty of implementing torque vector distribution technology for new energy vehicles.

[0027] Specifically, see Figures 1 to 4, shown is a schematic diagram of the main structure of the transmission device and the drive system in the embodiment of the present invention, wherein the first motor 8, the first bearing 10, the second bearing 23 and the second motor 25 are installed on the fixing part, and the planetary carrier 22 is rotatably installed on the fixing part through the first bearing 10 and the second bearing 23. The fixing part can be the outer shell of the front axle and the rear axle, etc., and the present application does not make any special limitation on this. It can be understood that for different fixing part structures, in order to realize the rotation feasibility of each part of the system, it is necessary to match the corresponding bearing structure. At the same time, the rotation feasibility design should not affect the realization of the core invention point of the present invention. Therefore, the present application does not elaborate on the relevant feasibility design that does not affect the realization of the core invention point of the present invention, nor does it make any special limitation.

[0028] The transmission device is mainly associated with the planetary carrier 22, and includes a first output shaft 7 and a second output shaft 26 coaxially spaced in the planetary carrier 22. The first output shaft 7 is rotatably sleeved with a first input shaft 9, and the second output shaft 26 is rotatably sleeved with a second input shaft 27. The planetary carrier 22 is provided with a first planetary gear and a second planetary gear 20 which are respectively transmission-connected with the first input shaft 9 and the second input shaft 27. The second planetary gear 20 is used to drive the planetary carrier 22 to rotate according to the input power of the second input shaft 27.

[0029] like Figure 3 As shown, the second input shaft 27 is transmission connected with the second motor 25, a second input gear 28 is arranged on the second input shaft 27, the second planetary gear 20 is a double gear, a second ring gear 21 is arranged on the external fixing part, and two gear structures in the second planetary gear 20 are respectively meshed and connected with the second input gear 28 and the second ring gear 21. When the second motor 25 outputs and drives the second input shaft 27 to rotate, the second planetary gear 20 can be driven to rotate. When the second planetary gear 20 rotates, it can revolve synchronously along the second ring gear 21, thereby driving the planet carrier 22 to rotate relative to the external fixing part.

[0030] In order to realize the equal speed operation of the two output shafts during linear operation, as well as differential operation, Figure 2As shown, the planetary carrier 22 is also provided with a third planetary gear 19, and the first output shaft 7 and the second output shaft 26 are respectively fixedly provided with a first output gear 30 and a second output gear 29, the first planetary gear is a multi-link gear, the first gear structure 16 in the first planetary gear is used to access the power transmitted by the first input shaft 9, the second gear structure 17 is meshed and connected with the first output gear 30, and the third gear structure 18 is meshed and connected with the second output gear 29 through the third planetary gear 19. When the first planetary gear and the third planetary gear 19 only follow the planetary carrier 22 to revolve, the first output gear 30 and the second output gear 29 can be driven to revolve synchronously with the planetary carrier 22, so that the first output shaft 7 and the second output shaft 26 are output at the same speed. The first output shaft 7 and the second output shaft 26 are transmission-connected with the wheel shaft 6 through a coupling to transmit the output power to the wheel 5.

[0031] In order to realize the self-rotation drive of the first planetary gear, in this embodiment, Figure 4 As shown, an inner planet carrier 14 is also rotatably provided on the first input shaft 9, a sun gear 15 is provided on the inner planet carrier 14, the sun gear 15 is meshed and transmission-connected with the first gear structure 16 in the first planetary gear, a fourth planetary gear 12 is also provided on the inner planet carrier 14, the fourth planetary gear 12 is meshed and transmission-connected with the first input gear 11 fixedly provided on the first input shaft 9, the fourth planetary gear 12 is also meshed and connected with the first ring gear 13, and the first ring gear 13 is fixedly provided on the external fixing member. When the first input shaft 9 rotates, the fourth planetary gear 12 is driven to rotate, and while the fourth planetary gear 12 rotates, it revolves along the first ring gear 13, thereby driving the inner planet carrier 14 to rotate around the first output shaft 7, and the first planetary gear is driven to rotate by the rotation of the inner planet carrier 14.

[0032] When driving in a straight line and the first output shaft 7 and the second output shaft 26 need to be of equal speed, the first input shaft 9 has no power input and is in a free state, the first planetary gear and the third planetary gear 19 revolve synchronously with the planet carrier 22, the gear radius of the second gear structure 17 and the third gear structure 18 are different, and the transmission structure to the first output shaft 7 and the second output shaft 26 is a primary transmission and a secondary transmission respectively. In the absence of active drive by input power from the first input shaft 9, the first two gears in the secondary transmission remain relatively stationary, thereby locking the first planetary gear from rotating, and then making the first output gear 30 and the second output gear 29 remain stationary relative to the first planetary gear, revolve with the planet carrier 22, and rotate at a constant speed.

[0033] When the first output shaft 7 and the second output shaft 26 are output at the same speed, the first planetary gear will also synchronously drive the inner planetary carrier 14 to rotate at the same speed with the two output shafts, so that the fourth planetary gear 12 set on the inner planetary carrier 14 will revolve synchronously, thereby driving the first input shaft 9 to rotate. Therefore, when driving in a straight line, the first motor 8 that drives the first input shaft 9 needs to work in the free mode. Among them, when driving in a straight line, the first motor 8 can also work in the power generation mode to achieve power recovery. The recovered power is transmitted to the inverter 3 through the second cable 4, converted into direct current, and then supplied to the battery pack 1 by the inverter 3 through the first cable 2 to charge the battery pack 1.

[0034] To achieve differential speed, the gear radii of the first output gear 30 and the second output gear 29 are different. At the same time, the power transmission from the input shaft to the output needs to be reduced, and the gear radius of the output gear is larger. Correspondingly, the orbital radius of the first planetary gear is larger than the orbital radius of the second planetary gear 20, which is convenient for adapting to the configuration of the reduction ratio. In practical applications, the size relationship between the orbital radius of the first planetary gear and the orbital radius of the second planetary gear 20 can also be adaptively adjusted according to different speed matching requirements.

[0035] The orbital radius of the third planetary gear 19 is smaller than that of the second planetary gear 20, so that the input point of the input torque is located in the middle of the orbital axis of the first planetary gear and the third planetary gear 19, which facilitates balanced torque transmission, reduces damage to the mechanical structure caused by torque transmission, and improves the stability and reliability of the system.

[0036] To achieve the deceleration of the input power, in this embodiment, Figure 3 As shown, the second planetary gear 20 is a double gear, one gear structure in the second planetary gear 20 is meshed and connected with the second ring gear 21, and the other gear structure in the second planetary gear is meshed and connected with the second input gear 28 on the second input shaft 27. The second ring gear 21 is fixed on an external fixing member, and the gear radius of the gear structure meshed with the second ring gear 21 is smaller than the gear radius of the other gear structure, thereby realizing the deceleration of the transmission speed.

[0037] The present invention further provides a driving system, comprising the above-mentioned transmission device, and a first motor 8 and a second motor 25 , wherein the first motor 8 is used to drive the first input shaft 9 , and the second motor 25 is used to drive the second input shaft 27 .

[0038] Based on the functional differences between straight-line driving and torque distribution control, in this embodiment, the second motor 25 is the main drive motor, used for the main power supply in straight-line driving. Correspondingly, the rated power of the first motor 8 is less than the rated power of the second motor 25, which can reduce the hardware cost of the motor and thus reduce the implementation cost of the drive system. Corresponding to the difference in the rated power of the motor, the second motor 25 is connected to the inverter 3 through the third cable 24, and the specifications of the third cable 24 and the second cable 4 can be selected according to the specific power requirements.

[0039] The installation of the drive system to the vehicle also requires connecting the output shaft to the wheel. In this embodiment, the first output shaft 7 and the second output shaft 26 are respectively connected to the wheel shaft 6 through a coupling. The coupling can be a coupling with a buffer structure to improve driving stability.

[0040] The present invention also provides a vehicle, including the above-mentioned drive system, which can only use one motor to drive when driving in a straight line. When it is necessary to allocate the torque of the two output shafts to achieve vehicle steering or grip control, another motor is used to drive the first input shaft, so that the torque of the two output shafts can be effectively allocated, which can effectively reduce the complexity of torque vector distribution control and reduce the difficulty of implementing torque vector distribution technology. And the reduction in control difficulty can also facilitate the implementation of four-wheel drive.

[0041] The transmission device, drive system and vehicle transmission structure provided by the present invention are compact, and there is no need to monitor the operation of multiple motors at the same time on a regular basis. There is no need to simultaneously regulate multiple motors during torque distribution, which can effectively reduce the control complexity of torque distribution, reduce the difficulty of implementing torque vector distribution technology for new energy vehicles, and effectively improve the overall performance of new energy vehicles.

[0042] In differential control, the output power of the first motor can re-accelerate and re-decelerate the two output shafts respectively, realizing differential control, wherein the re-accelerated high-speed output shaft can obtain the output torque superposition of the first motor and the second motor, thereby improving the driving ability, and when the wheels on one side slip and idle, the first motor can provide torque supplement for the non-slip wheels, thereby improving the vehicle's ability to escape from difficulties. That is, compared with the separately driven four-wheel drive system in the prior art, the drive system provided by the present invention can improve the driving ability of the high-speed side in differential control and improve vehicle performance.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above-mentioned embodiments only express several specific implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A transmission device, characterized in that: include: The first output shaft and the second output shaft are coaxially arranged in the planet carrier and spaced apart from each other, and the first input shaft and the second input shaft are respectively rotatably sleeved on the first output shaft and the second output shaft, wherein: The planet carrier is provided with a first planetary gear and a second planetary gear respectively connected to the first input shaft and the second input shaft, and the second planetary gear is used to drive the planet carrier to rotate according to the input power of the second input shaft; The planet carrier is also provided with a third planetary gear, the first output shaft and the second output shaft are respectively fixedly provided with a first output gear and a second output gear, the first planetary gear is a multi-linked gear, and the two gear structures in the first planetary gear are respectively meshed and connected with the first output gear, and are meshed and connected with the second output gear through the third planetary gear; The first input shaft is used to control the rotation of the first planetary gear, so that when the second input shaft drives the planetary carrier to rotate through the second planetary gear, the speed difference between the first output shaft and the second output shaft is adjusted by adjusting the rotation speed of the first planetary gear.

2. The transmission device according to claim 1, characterized in that: An inner planet carrier is also rotatably arranged on the first input shaft, and the inner planet carrier is transmission-connected to the first planetary gear. A fourth planetary gear is arranged on the inner planet carrier, and the fourth planetary gear is transmission-connected to the first input shaft. The fourth planetary gear is also meshingly connected to the first ring gear. The first ring gear is fixedly arranged on an external fixing member, and the planet carrier can rotate relative to the external fixing member.

3. The transmission device according to claim 1, characterized in that: The orbital radius of the first planetary gear is greater than the orbital radius of the second planetary gear.

4. The transmission device according to claim 2, characterized in that: The orbital radius of the third planetary gear is smaller than the orbital radius of the second planetary gear.

5. The transmission device according to claim 1, characterized in that: The second planetary gear is a double gear, one gear structure in the second planetary gear is meshed and connected with the second ring gear, the other gear structure in the second planetary gear is drivingly connected with the second input shaft, the second ring gear is fixed on an external fixing member, and the planet carrier can rotate relative to the external fixing member.

6. A drive system, characterized in that: The transmission device comprises the transmission device according to any one of claims 1 to 5, and a first motor and a second motor, wherein the first motor is used to drive the first input shaft, and the second motor is used to drive the second input shaft.

7. The drive system according to claim 6, characterized in that: The rated power of the first motor is smaller than the rated power of the second motor.

8. The drive system according to claim 6, characterized in that: The first output shaft and the second output shaft are also drivingly connected to the wheel shaft through a coupling respectively.

9. A vehicle, characterized in that: A drive system comprising any one of claims 6 to 8.

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