Electric drive axle and vehicle

Abstract

The utility model discloses an electric drive axle and a vehicle, and the electric drive axle comprises a motor assembly which comprises a stator and two rotors; the number of the clutch assemblies is two, and the two clutch assemblies are respectively connected with one rotor; the number of the double-planet-row assemblies is two, and each double-planet-row assembly comprises a planet row gear ring, a first-stage planet row gear set and a second-stage planet row gear set. The axial magnetic flux motor with one stator and two rotors is adopted to output power to the left driving wheel and the right driving wheel of a vehicle respectively, the axial magnetic flux motor is applied to the centralized drive axle, an effective cooling system can be designed, and the axial magnetic flux motor is cooled and lubricated; two sets of fixed double-planet-row speed reduction mechanisms sharing a gear ring are adopted, and a coaxial power output framework is achieved. A clutch assembly is designed between rotor power output and a planet row, and rotation speed synchronization, rotation speed differential and output torque distribution of a left planet row speed reduction output mechanism and a right planet row speed reduction output mechanism are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle transmission, in particular to an electric drive bridge and a vehicle. Background Art

[0002] The electric drive axle is a mechatronic drive system for electric vehicles, which is responsible for vehicle power transmission, differential steering and braking functions. With the development of lightweight electric vehicles and intelligent chassis wire control technology, lightweight and vector-controlled intelligent electric drive axles are key technical directions.

[0003] At present, the main product technology architecture of electric drive axles is a centralized motor drive architecture, which uses a two-stage parallel shaft reducer driven by a radial flux motor, and then a mechanical differential to achieve the differential function. On this basis, a dual radial flux motor centralized opposed type has been developed. Similar to the centralized motor drive structure, two drive motors and two reducers are arranged oppositely on the frame. Its advantage is that there is no problem of increased unsprung mass caused by the hub motor. Whether it is a single motor or a dual motor opposed type, under the same power and torque output requirements, the radial flux motors used have the disadvantages of large size and heavy weight.

[0004] Each motor drives a parallel-axis two-stage reduction mechanism, which controls the speed difference between the two motors to achieve the speed difference between the left and right wheels to form vehicle steering, and controls the output torque of the two motors to achieve torque distribution to the left and right wheels. The parallel-axis two-stage reduction design increases the size of the electric drive axle, which brings challenges to the chassis design of electric vehicles.

[0005] To realize the differential lock function, it is necessary to add a set of mechanical locking mechanisms to each of the left and right wheel ends to lock the wheels with the left and right half-axles, and realize the differential lock of the vehicle under the same speed control of the two motors. The centralized electric drive axle adopts the traditional mechanical differential and cannot realize the intelligent steering control of the vehicle. The dual-motor opposed type requires the two motors to realize the speed control and torque distribution control with strong real-time performance. For the differential lock under the vehicle's escape drive, these two centralized electric drive axles need to add a separate locking mechanism. Utility Model Content

[0006] The utility model aims to provide an electric drive axle and a vehicle to solve the problems of large size, heavy weight and difficulty in intelligent differential locking of the current single-motor or dual-motor opposed electric drive axles.

[0007] In a first aspect, the utility model provides an electric drive axle, comprising:

[0008] The motor assembly comprises a stator and two rotors, wherein the two rotors are symmetrically arranged on the outer circumference of the stator;

[0009] Clutch assembly, there are two clutch assemblies, and the two clutch assemblies are respectively connected to one rotor;

[0010] Double planetary gear set assembly, there are two double planetary gear set assemblies, and the two double planetary gear set assemblies are respectively connected to one clutch assembly in a transmission manner. The double planetary gear set assembly includes a planetary gear ring, a first-stage planetary gear set, and a second-stage planetary gear set. Both the first-stage planetary gear set and the second-stage planetary gear set are meshed with the planetary gear ring. The first-stage planetary gear set is connected to the other end of the clutch assembly. The first-stage planetary gear set is used to transmit the power output by the motor assembly to the second-stage planetary gear set, and the second-stage planetary gear set is used to output the power transmitted by the first-stage planetary gear set to the wheels.

[0011] An electric drive axle as described above, wherein, preferably, the first-stage planetary gear set includes a first-stage planetary sun gear shaft gear, a first-stage planetary carrier, and first-stage planetary gears. The first-stage planetary sun gear shaft gear is connected to the clutch assembly. The first-stage planetary gears are respectively meshed with the first-stage planetary sun gear shaft gear and the planetary gear ring. The first-stage planetary gears are mounted on the first-stage planetary carrier.

[0012] An electric drive axle as described above, wherein, preferably, the second-stage planetary gear set includes a second-stage planetary sun gear shaft gear, a second-stage planetary carrier, and second-stage planetary gears. The second-stage planetary sun gear shaft gear is connected to the first-stage planetary carrier. The second-stage planetary gears are respectively meshed with the second-stage planetary sun gear shaft gear and the planetary gear ring. The second-stage planetary gears are mounted on the second-stage planetary carrier.

[0013] An electric drive axle as described above, wherein, preferably, the planetary gear ring includes two groups of internal teeth, and the first-stage planetary gears and the second-stage planetary gears are respectively meshed with one group of the internal teeth.

[0014] An electric drive axle as described above, wherein, preferably, the electric drive axle further includes a rotor output shaft. One end of the rotor output shaft is connected to the rotor through a flange, and the other end of the rotor output shaft is connected to the inner disk hub of the clutch assembly through splines.

[0015] An electric drive axle as described above, wherein, preferably, the outer disk hub of the clutch assembly is connected to the first-stage planetary sun gear shaft gear through splines.

[0016] An electric drive axle as described above, wherein, preferably, the first-stage planetary gears are mounted on the first-stage planetary carrier through rolling bearings.

[0017] An electric drive axle as described above, wherein preferably, the planetary gear of the secondary planetary row is mounted on the secondary planetary carrier through a rolling bearing.

[0018] An electric drive axle as described above, wherein preferably, both the stator and the planetary gear ring are fixed to the housing of the electric drive axle.

[0019] In a second aspect, the present utility model provides a vehicle including the aforementioned electric drive axle.

[0020] Compared with the prior art, the present utility model adopts an axial-flux motor with one stator and two rotors, which respectively output power to the left and right drive wheels of the vehicle. Compared with the radial-flux motor, the axial-flux motor has technical characteristics of being structurally compact, flat and ultra-thin, small in volume, light in weight, and high in power density. Applying the axial-flux motor in a centralized drive axle can design an effective cooling system to cool and lubricate the axial-flux motor; adopting a double planetary row reduction mechanism with two sets of shared and fixed gear rings to achieve a coaxial power output structure; between the rotor power output and the planetary row, a clutch assembly is designed to achieve speed synchronization, speed differential, and output torque distribution of the left and right two sets of planetary row reduction output mechanisms, so as to achieve straight-line driving, steering, anti-skid and off-road capabilities of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the electric drive axle provided by the embodiment of the present utility model.

[0022] DESCRIPTION OF REFERENCE NUMERALS:

[0023] 10 - Motor assembly, 11 - Stator, 12 - Rotor;

[0024] 20 - Clutch assembly;

[0025] 30 - Double planetary row assembly, 31 - Planetary gear ring, 32 - First-stage planetary row gear set, 321 - First-stage planetary row sun gear shaft tooth, 322 - First-stage planetary carrier, 323 - First-stage planetary gear, 33 - Second-stage planetary row gear set, 331 - Second-stage planetary row sun gear shaft tooth, 332 - Second-stage planetary carrier, 333 - Second-stage planetary gear;

[0026] 40 - Rotor output shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0028] In a first aspect, referring to Figure 1As shown, the utility model provides an electric drive axle, including a motor assembly 10, a clutch assembly 20 and a double planetary gear assembly 30, wherein:

[0029] The motor assembly 10 includes a stator 11 and two rotors 12. The two rotors 12 are symmetrically arranged on the outer circumference of the stator 11. The stator 11 and the two rotors 12 are coaxially arranged to form an "I"-shaped axial flux motor. The axial flux motor has the technical characteristics of compact structure, flat and ultra-thin, small size, light weight, and high power density. Compared with the traditional radial flux motor, the torque density of the axial flux motor can be increased by more than 30%. The use of the axial flux motor in the centralized drive axle can design an effective cooling system to cool and lubricate the axial flux motor.

[0030] The clutch assembly 20 includes two clutch assemblies 20, each of which is connected to a rotor 12 in a transmission manner. In the embodiment provided in the present application, the rotor 12 is connected to the clutch assembly 20 through a rotor output shaft 40, one end of the rotor output shaft 40 is connected to the rotor 12 through a flange, and the other end of the rotor output shaft 40 is spline-connected to the inner hub of the clutch assembly 20. The power output by the motor assembly 10 is transmitted to the clutch assembly 20 via the rotor output shaft 40.

[0031] In a feasible implementation, the clutch assembly 20 is a multi-plate wet clutch assembly. The multi-plate wet clutch assembly has the advantages of long service life and extremely low probability of failure. The use of a multi-plate wet clutch is beneficial to improving the working efficiency and safety performance of the electric drive axle.

[0032] The double planetary gear assembly 30 includes two double planetary gear assemblies 30, each of which is transmission-connected to a clutch assembly 20. The double planetary gear assembly 30 includes a planetary gear ring 31, a primary planetary gear set 32, and a secondary planetary gear set 33. The power output by the motor assembly 10 can be transmitted from the primary planetary gear set 32 ​​to the secondary planetary gear set 33, and the secondary planetary gear set 33 can output the received power to the wheels.

[0033] In the embodiments provided by the present application, the first-stage planetary gear set 32 includes a first-stage planetary sun gear shaft tooth 321, a first-stage planetary carrier 322, and a first-stage planetary gear 323. The first-stage planetary sun gear shaft tooth 321 is connected to the outer disk hub of the clutch assembly 20 through a spline. The first-stage planetary gear 323 meshes with the first-stage planetary sun gear shaft tooth 321 and the planetary gear ring 31 respectively. The first-stage planetary gear 323 is installed on the first-stage planetary carrier 322 through a rolling bearing. When the clutch assembly 20 is engaged, after the first-stage planetary sun gear shaft tooth 321 receives power and rotates, it drives the first-stage planetary gear 323 to rotate along the planetary gear ring 31, and the first-stage planetary carrier 322 rotates synchronously with the rotation of the first-stage planetary gear 323, thereby realizing the transmission of power.

[0034] Further, the second-stage planetary gear set 33 includes a second-stage planetary sun gear shaft tooth 331, a second-stage planetary carrier 332, and a second-stage planetary gear 333. The second-stage planetary sun gear shaft tooth 331 is connected to the first-stage planetary carrier 322. The second-stage planetary gear 333 meshes with the second-stage planetary sun gear shaft tooth 331 and the planetary gear ring 31 respectively. The second-stage planetary gear 333 is installed on the second-stage planetary carrier 332 through a rolling bearing. The second-stage planetary carrier 332 is connected to the vehicle wheel. When the first-stage planetary gear set 32 receives power, the power is transmitted to the second-stage planetary sun gear shaft tooth 331 through the first-stage planetary carrier 322. After the second-stage planetary sun gear shaft tooth 331 receives power and rotates, it drives the second-stage planetary gear 333 to rotate along the planetary gear ring 31, and finally the power is transmitted to the vehicle wheel through the second-stage planetary carrier 332.

[0035] In a feasible embodiment, both the stator 11 and the planetary gear ring 31 are fixed to the housing of the electric drive axle. The planetary gear ring 31 includes two sets of internal teeth. The first-stage planetary gear 323 and the second-stage planetary gear 333 mesh with one set of internal teeth respectively, that is, the first-stage planetary gear 323 and the second-stage planetary gear 333 are coaxially arranged to achieve the deceleration function, thereby making the structure of the electric drive axle more compact, reducing the volume of the electric drive axle, and being beneficial to realizing the lightweight of the electric drive axle.

[0036] In the embodiments provided by the present application, refer to Figure 1As shown, a rotor 12 is provided along the left and right sides of the stator 11 respectively. The two rotors 12 are connected to the clutch assembly 20 through a rotor output shaft 40 respectively. Each clutch assembly 20 is further connected to a double planetary gear assembly 30. The double planetary gear assembly 30 on the left is connected to the left drive wheel of the vehicle, and the double planetary gear assembly 30 on the right is connected to the right drive wheel of the vehicle. The structures on the left and right sides are the same. By controlling the output torque of the motor assembly 10 and the clutch assembly 20, the straight-line driving, anti-skid control, steering, braking and brake energy recovery of the vehicle are realized.

[0037] Based on the above embodiments, when the clutch assemblies 20 on the left and right sides are engaged, the motor assembly 10 achieves the same speed and equal torque distribution of the left and right drive wheels by reducing the output of the double planetary gear assembly 30 on both sides, thereby achieving the linear motion of the vehicle. When the output torque of the electric drive bridge is greater than the ground adhesion torque, the anti-skid control during the vehicle driving process can be achieved by reducing the synchronous slip control of the motor assembly 10 or the clutch assemblies 20 on both sides. When the vehicle is turning, by controlling the output torque of the motor assembly 10 and the different slip states of the clutch assemblies 20 on both sides, the different speed outputs and torque distribution of the double planetary gear assembly 30 on the left and the double planetary gear assembly 30 on the right are achieved, and the steering function of the vehicle is realized. When the motor assembly 10 is converted from the function of a driving motor to the function of a braking motor, deceleration braking and braking energy recovery of the vehicle can be achieved.

[0038] On the second aspect, the utility model provides a vehicle, including the aforementioned electric drive axle. Since the electric drive axle is provided with an axial flux motor, and the axial flux motor has the characteristics of compact structure, flat and ultra-thin, small size, light weight, and high power density, it can improve the torque density. Two sets of shared and fixed double planetary gear assemblies 30 are used as a deceleration mechanism on both sides of the motor assembly 10 to realize a coaxial power output architecture. The clutch assembly 20 adopts a multi-plate wet clutch assembly, and the control of the engagement state and the sliding state of the left and right multi-plate wet clutches is realized through the electro-hydraulic control mode, and the speed synchronization, speed difference, and output torque distribution of the left and right sets of double planetary gear assemblies are realized, so as to realize the straight line, steering, anti-skid and escape from difficulties of the vehicle. Thereby, the lightweight and intelligent automobile is realized.

[0039] The above describes in detail the structure, features and effects of the utility model based on the embodiments shown in the drawings. The above is only a preferred embodiment of the utility model, but the utility model is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the utility model, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and the drawings, should be within the protection scope of the utility model.

Claims

1. An electric drive axle, characterized in that, Comprising: A motor assembly, including a stator and two rotors, the two rotors being symmetrically arranged on the outer circumference of the stator; A clutch assembly, there being two clutch assemblies, the two clutch assemblies being respectively connected to one of the rotors; A double planetary gear set, there being two double planetary gear sets, the two double planetary gear sets being respectively in transmission connection with one of the clutch assemblies, the double planetary gear set including a planetary gear ring, a first-stage planetary gear set and a second-stage planetary gear set, the first-stage planetary gear set and the second-stage planetary gear set both being meshed with the planetary gear ring, the first-stage planetary gear set being connected to the other end of the clutch assembly, the first-stage planetary gear set being used for transmitting the power output by the motor assembly to the second-stage planetary gear set, and the second-stage planetary gear set being used for outputting the power transmitted by the first-stage planetary gear set to the wheels.

2. The electric drive axle according to claim 1, characterized in that, The first-stage planetary gear set includes a first-stage planetary sun gear shaft tooth, a first-stage planetary carrier, and first-stage planetary gears, the first-stage planetary sun gear shaft tooth being connected to the clutch assembly, the first-stage planetary gears being respectively meshed with the first-stage planetary sun gear shaft tooth and the planetary gear ring, and the first-stage planetary gears being mounted on the first-stage planetary carrier.

3. The electric drive axle according to claim 2, wherein The second-stage planetary gear set includes a second-stage planetary sun gear shaft tooth, a second-stage planetary carrier, and second-stage planetary gears, the second-stage planetary sun gear shaft tooth being connected to the first-stage planetary carrier, the second-stage planetary gears being respectively meshed with the second-stage planetary sun gear shaft tooth and the planetary gear ring, and the second-stage planetary gears being mounted on the second-stage planetary carrier.

4. The electric drive axle according to claim 3, characterized in that, The planetary gear ring includes two sets of internal teeth, the first-stage planetary gears and the second-stage planetary gears being respectively meshed with one set of the internal teeth.

5. The electric drive axle according to claim 4, characterized in that, The electric drive axle further includes a rotor output shaft, one end of the rotor output shaft being connected to the rotor through a flange, and the other end of the rotor output shaft being in spline connection with the inner disk hub of the clutch assembly.

6. The electric drive axle according to claim 5, characterized in that The outer disk hub of the clutch assembly is in spline connection with the first-stage planetary sun gear shaft tooth.

7. The electric drive axle according to claim 6, characterized in that, The first-stage planetary gears are mounted on the first-stage planetary carrier through rolling bearings.

8. The electric drive axle according to claim 7, characterized in that, The second-stage planetary gears are mounted on the second-stage planetary carrier through rolling bearings.

9. The electric drive axle according to claim 1, characterized in that, Both the stator and the planetary gear ring are fixed to the housing of the electric drive axle.

10. A vehicle, characterized in that, Including the electric drive axle according to any one of claims 1 to 9.

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