Electric automobile and braking device thereof

Abstract

The utility model discloses an electric automobile and a braking device thereof.The braking device of the electric automobile comprises an electric drive assembly, the electric drive assembly comprises a power motor, a power battery, a speed reduction assembly and a mechanical braking assembly, the power battery is connected with the power motor, and a main shaft of the output end of the power motor is connected with the input end of the speed reduction assembly; the output end of the speed reduction assembly is in transmission connection with wheels. When the electric automobile is braked, the power motor is used for charging the power battery. The mechanical braking assembly comprises a mechanical driving module, a pressure disc and a braking disc, the braking disc is fixedly connected with the end of the main shaft, the pressure disc is connected with the output end of the mechanical driving module, and the mechanical driving module drives the pressure disc to get close to and get away from the braking disc; when the pressure disc abuts against the brake disc, the mechanical driving module provides braking force for the wheels. According to the braking device, the driving safety of the electric automobile is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of transportation equipment, and in particular to an electric vehicle and a braking device thereof. Background Art

[0002] Electric vehicles refer to vehicles that use an onboard power source as a power source, use an electric motor to drive the wheels, and comply with various requirements of road traffic and safety regulations. Electric vehicles include pure electric vehicles, hybrid vehicles, and fuel cell vehicles. They are widely used because they have less impact on the environment than traditional vehicles.

[0003] In order to improve the efficiency of energy utilization, electric vehicles have generally used electric brakes in electric drive assemblies to recover braking energy, which not only improves the endurance of electric vehicles, but also reduces the frequency of intervention of traditional hydraulic brake systems and extends the service life of hydraulic brake systems. However, for high-speed emergency braking and other vehicle conditions, electric brakes cannot meet the braking needs, resulting in low driving safety of electric vehicles.

[0004] Therefore, how to improve the driving safety of electric vehicles is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The purpose of the present application is to provide a braking device for an electric vehicle to improve the driving safety of the electric vehicle. Another purpose of the present application is to provide an electric vehicle comprising the braking device.

[0006] The braking device of the electric vehicle provided in the present application includes an electric drive assembly, and the electric drive assembly includes:

[0007] Power motor;

[0008] A power battery, the power battery is connected to the power motor;

[0009] A deceleration assembly, wherein the main shaft of the output end of the power motor is connected to the input end of the deceleration assembly, and the output end of the deceleration assembly is connected to the wheel transmission; when the electric vehicle brakes, the power motor is used to charge the power battery;

[0010] A mechanical brake assembly, the mechanical brake assembly includes a mechanical drive module, a pressure plate, and a brake disc, the brake disc is fixedly connected to the end of the main shaft, the pressure plate is connected to the output end of the mechanical drive module, and the mechanical drive module drives the pressure plate to approach and move away from the brake disc; when the pressure plate abuts against the brake disc, the mechanical drive module provides wheel braking force.

[0011] Optionally, in the braking device of the electric vehicle, the mechanical drive module includes:

[0012] Brake servo motor;

[0013] An axis transmission device, the axis transmission device is connected to the pressure plate to drive the pressure plate to move toward and away from the brake disc;

[0014] A worm gear assembly, wherein the input end of the worm gear assembly is connected to the output end of the brake servo motor, and the output end of the worm gear assembly is connected to the axis transmission device.

[0015] Optionally, in the braking device of the above-mentioned electric vehicle, the axis transmission device includes a ball screw, the worm of the worm gear assembly is connected to the output end of the brake servo motor, the worm wheel of the worm gear assembly is connected to the ball screw, and the ball screw is connected to the pressure plate.

[0016] Optionally, the braking device of the above-mentioned electric vehicle also includes a control module, the mechanical braking assembly also includes a pressure sensor, the axis transmission device and the pressure plate are connected through the pressure sensor, and the brake servo motor, the pressure sensor and the power motor are all connected to the control module signal.

[0017] Optionally, in the braking device of the electric vehicle, the mechanical drive module and the main body of the power motor are arranged on opposite sides of the main shaft axis direction, and the brake servo motor is close to the reduction assembly relative to the worm gear assembly.

[0018] Optionally, in the braking device of the electric vehicle, when the electric vehicle is in a parking state, the pressure plate abuts against the brake plate, and the mechanical drive module provides a second braking force for the wheel.

[0019] Optionally, in the braking device of the electric vehicle, the electric drive assembly further includes:

[0020] Differential;

[0021] A half shaft, wheels are mounted on opposite sides of the half shaft in the axis direction, and the reduction assembly is connected to the half shaft through the differential.

[0022] Optionally, the braking device of the above-mentioned electric vehicle also includes a brake assembly and a hydraulic brake assembly, one of the hydraulic brake assembly and the electric drive assembly is connected to the front wheel transmission of the electric vehicle, and the other is connected to the rear wheel transmission of the electric vehicle, and both the hydraulic brake assembly and the electric drive assembly are connected to the brake assembly signal.

[0023] Optionally, in the braking device of the electric vehicle, the power motor, the mechanical brake assembly and the deceleration assembly are integrated.

[0024] A car comprises a braking device, wherein the braking device is the braking device of the electric car described in any one of the above items.

[0025] In the above technical solution, the braking device of the electric vehicle provided by the present application includes an electric drive assembly, which includes a power motor, a power battery, a deceleration assembly and a mechanical brake assembly. The power battery is connected to the power motor, and the main shaft at the output end of the power motor is connected to the input end of the deceleration assembly, and the output end of the deceleration assembly is connected to the wheel transmission; when the electric vehicle brakes, the power motor is used to charge the power battery. The mechanical brake assembly includes a mechanical drive module, a pressure plate, and a brake disc. The brake disc is fixedly connected to the end of the main shaft, and the pressure plate is connected to the output end of the mechanical drive module. The mechanical drive module drives the pressure plate to approach and move away from the brake disc; when the pressure plate abuts against the brake disc, the mechanical drive module provides wheel braking force.

[0026] It can be seen from the above description that in the braking device of the electric vehicle provided in the present application, a mechanical brake assembly is provided in the electric drive assembly. The mechanical brake assembly is achieved through the abutment between the pressure plate and the brake disc, and the mechanical drive module can provide wheel braking force, thereby enabling the electric vehicle to brake effectively. Therefore, the braking device provided in the present application effectively improves the driving safety of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 A distribution diagram of the braking device provided in the embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of the electric drive assembly provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of a mechanical brake assembly provided in an embodiment of the present application;

[0031] Figure 4 A control flow chart of the braking device provided in an embodiment of the present application;

[0032] Figure 5 This is a logic diagram of braking torque distribution of the braking device provided in an embodiment of the present application.

[0033] in Figure 1-3In: 1-electric drive assembly, 2-rear wheel, 3-brake disc and brake caliper, 4-hydraulic oil pipeline, 5-brake pedal, 6-intelligent brake system, 7-vehicle bus, 8-front wheel, 9-wheel, 10-mechanical brake assembly, 11-differential, 12-half shaft, 13-reduction assembly, 14-power motor, 15-brake disc, 16-pressure plate, 17-axis transmission device, 18-worm gear, 19-worm, 20-brake servo motor, 21-pressure sensor. DETAILED DESCRIPTION

[0034] The core of the present application is to provide a braking device for an electric vehicle to improve the driving safety of the electric vehicle. Another core of the present application is to provide an electric vehicle comprising the braking device.

[0035] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and implementation methods.

[0036] Please refer to Figures 1 to 5 .

[0037] In a specific embodiment, the braking device of the electric vehicle provided in the specific embodiment of the present application includes an electric drive assembly 1, the electric drive assembly 1 includes a power motor 14, a power battery, a deceleration assembly 13 and a mechanical brake assembly 10, the power battery is connected to the power motor 14, the main shaft of the output end of the power motor 14 is connected to the input end of the deceleration assembly 13, and the output end of the deceleration assembly 13 is connected to the wheel 9 in a transmission connection; when the electric vehicle brakes, the power motor 14 is used to charge the power battery.

[0038] The mechanical brake assembly 10 includes a mechanical drive module, a pressure plate 16, and a brake disc 15. The brake disc 15 is fixedly connected to the end of the main shaft, and the pressure plate 16 is connected to the output end of the mechanical drive module. The mechanical drive module drives the pressure plate 16 to approach and move away from the brake disc 15. When the pressure plate 16 abuts against the brake disc 15, the mechanical drive module provides a braking force for the wheel 9. Specifically, the mechanical drive module can drive the pressure plate 16 to approach and move away from the brake disc 15 through a hydraulic cylinder or a cylinder.

[0039] like Figure 3As shown, in a specific embodiment, the mechanical drive module includes a brake servo motor 20, an axis transmission device 17 and a worm gear assembly, and the axis transmission device 17 is connected to the pressure plate 16 to drive the pressure plate 16 to move closer to and away from the brake disc 15. The input end of the worm gear assembly is connected to the output end of the brake servo motor 20, and the output end of the worm gear assembly is connected to the axis transmission device 17. Specifically, the axis transmission device 17 includes a ball screw, the worm 19 of the worm gear assembly is connected to the output end of the brake servo motor 20, the worm wheel 18 of the worm gear assembly is connected to the ball screw, and the ball screw is connected to the pressure plate 16. In a specific working mode, the brake servo motor 20 drives the worm 19 to rotate, the worm 19 drives the worm wheel 18 to rotate, and the worm wheel 18 drives the axis transmission device 17 to move horizontally.

[0040] Specifically, when the brake device is in effect, the brake servo motor 20 rotates a certain angle according to the input signal, and drives the worm wheel 18 to rotate through the worm 19. The worm wheel 18 and the ball screw are coaxially connected. The lead screw of the ball screw pushes the pressure plate 16 to move axially under the drive of the worm wheel 18. At this time, the axis is the axis direction of the lead screw. The pressure plate 16 and the brake disc 15 are coaxially arranged. When the pressure plate 16 approaches the brake disc 15 along the axial direction under the drive of the brake servo motor 20, the pressure plate 16 gradually presses the brake disc 15 and generates pressure. The friction force generated by the pressure plate 16 and the brake disc 15 perpendicular to the pressure direction forms a resistance torque, wherein the resistance torque is transmitted to the wheel end through the transmission system to form a braking force.

[0041] In a specific embodiment, the brake device of the electric vehicle further includes a control module, the mechanical brake assembly 10 further includes a pressure sensor 21, the axis transmission device 17 and the pressure plate 16 are connected through the pressure sensor 21, and the brake servo motor 20, the pressure sensor 21 and the power motor 14 are all connected to the control module signal. Specifically, the opposite ends of the pressure sensor 21 are connected to the ball screw and the pressure plate 16 respectively.

[0042] To facilitate power transmission, in a specific embodiment, the mechanical drive module and the main body of the power motor 14 are arranged on opposite sides of the main shaft axis, and the brake servo motor 20 is close to the reduction assembly 13 relative to the worm gear assembly.

[0043] In a specific embodiment, when the electric vehicle is in a parking state, the pressure plate 16 abuts against the brake disc 15, and the mechanical drive module provides a second braking force to the wheel 9, wherein the magnitude of the second braking force is determined according to needs and is not specifically limited in this application.

[0044] During operation, the pressure sensor 21 senses the pressure of the pressure plate 16 on the brake disc 15, and transmits the signal to the control module to form a closed-loop control to achieve the desired braking torque. When the vehicle is parked, a driving signal can be given to the brake servo motor 20 to push the pressure plate 16 to press the brake disc 15. Due to the self-locking characteristics of the worm gear assembly, the generated braking force can be maintained for a long time.

[0045] The braking device of the electric vehicle includes a conventional hydraulic braking part and an electric drive assembly 1. The principles are the same for the front-wheel drive and rear-wheel drive models of the electric vehicle. The hydraulic braking structure of the rear-wheel drive model is located at the front wheel 8, and the electric drive assembly 1 is located at the rear wheel 2, while the front-wheel drive model is the opposite. In order to simplify the description, this patent is introduced by taking the rear-wheel drive model as an example.

[0046] In specific use, after the driver steps on the brake pedal 5, the intelligent brake system 6 collects the pedal opening signal through the sensor and calculates the braking force required for the front and rear axles. The braking force of the front axle is directly provided by the intelligent brake system 6, and then the pressure signal is transmitted to the wheel cylinder through the hydraulic oil pipeline 4, which drives the brake caliper to clamp the brake disc, and finally forms the braking torque required by the front axle. Among them, the intelligent brake system 6 transmits the braking force required by the rear axle to the vehicle controller through the bus, and the vehicle controller determines the distribution ratio of the electric brake and the mechanical brake of the rear axle in combination with the current vehicle speed, SOC, acceleration, driving mode and other signals. The gear pair in the deceleration component 13 drags the power motor 14 to generate electricity and stores the electrical energy in the power battery, while completing the braking force requirement of the electric brake. If the electric brake does not meet the braking requirement, the controller drives the brake servo motor 20 inside the electric drive to apply mechanical braking force to the main shaft through the transmission mechanism, and the electric braking force and the mechanical braking force together constitute the braking force required by the rear axle.

[0047] It can be seen from the above description that in the braking device of the electric vehicle provided in the specific embodiment of the present application, a mechanical brake component 10 is provided in the electric drive assembly 1. The mechanical brake component 10 is abutted against the pressure plate 16 and the brake disc 15, and the mechanical drive module can provide braking force to the wheel 9, thereby enabling the electric vehicle to brake effectively. Therefore, the braking device provided in the present application effectively improves the driving safety of the electric vehicle.

[0048] In a specific embodiment, the electric drive assembly 1 provided in the present application further includes a differential 11 and a half shaft 12, and the reduction assembly 13 is connected to the half shaft 12 via the differential 11. The wheels 9 are mounted on opposite sides of the half shaft 12 in the axial direction.

[0049] In a specific embodiment, the braking device of the electric vehicle also includes a brake assembly and a hydraulic brake assembly, one of the hydraulic brake assembly and the electric drive assembly 1 is transmission-connected to the front wheel 8 of the electric vehicle, and the other is transmission-connected to the rear wheel 2 of the electric vehicle, and both the hydraulic brake assembly and the electric drive assembly 1 are signal-connected to the brake assembly.

[0050] When driving, the power motor 14 drives the reduction assembly 13 to rotate, and transmits the power to the differential 11. The differential 11 transmits the input torque to the half shaft 12, and finally drives the wheel 9 to rotate, completing the driving process of the whole vehicle. When braking, the braking working state is exactly the opposite of the above process. The wheel 9 transmits the kinetic energy to the main shaft position of the power motor 14 through the half shaft 12, the differential 11 and the reduction assembly 13, and is converted into electrical energy by the power motor 14 and stored in the power battery, or converted into heat through the friction between the brake disc 15 and the pressure disc 16, and then taken away by the electric drive cooling system.

[0051] like Figure 3 As shown, the present application preferably integrates the mechanical brake assembly 10 at one end of the electric drive main shaft. By integrating the mechanical brake assembly 10 into the electric drive assembly, the braking control of the main shaft can be achieved. The power motor 14 of the main shaft drives the pressure plate 16 to move, and the pressure plate 16 presses the brake disc 15 to make up for the insufficient electric braking. Due to the torque amplification effect of the reducer, the power motor 14 at the main shaft end does not need to provide a large torque to meet the braking requirements. In order to cope with the different braking force requirements on the left and right sides of the drive shaft, a similar structure can be assembled at the starting end of the half-shaft 12 to form differentiated braking forces to meet the needs of special scenarios such as slipping, starting and emergency braking.

[0052] On the basis of the above schemes, considering the limited space in the electric vehicle, in order to reduce the overall installation volume, it is preferred that the power motor 14, the mechanical brake assembly 10 and the deceleration assembly 13 are integrated. Specifically, the three can be contained in a box that carries the electric drive assembly.

[0053] When braking under normal circumstances, the control process of the brake device is as follows: Figure 4As shown, the vehicle controller A01 calculates the braking force and electric brake torque required for the electric drive shaft. After the calculation is completed, step A02 is entered to judge according to the current state of the power motor 14. If the maximum electric drive braking force of the power motor 14 can meet the braking demand, the braking torque is completely provided by the electric brake of the power motor 14, the pressure plate 16 and the brake disc 15 remain separated, and the pressure signal of the pressure sensor 21 is 0. If the required braking force is greater than the braking force that can be provided by the electric brake, step A04 is entered. Specifically, electric braking is used to generate braking torque, and the insufficient part is supplemented by the brake servo motor 20 driving the pressure plate 16 to press the brake disc 15 to generate mechanical braking force. At this time, the signal of the pressure sensor 21 is not 0. At the same time, step A03 is performed to drag the motor to generate electricity to form electric braking force. Step A06 The current generated by the electric brake is input into the power battery. Step A05 receives the electric braking force and the mechanical braking force to realize the operation of the electric drive system.

[0054] The vehicle controller further determines the subsequent working state of the electric drive and brake servo motor 20 according to the vehicle speed, the opening degree of the brake pedal 5, the battery SOC and the braking intensity.

[0055] In actual operation, the braking torque distribution of the vehicle's braking device is as follows: Figure 5 Step B001: transmit the battery SOC, vehicle speed v, braking intensity a and brake pedal 5 opening angle P via CAN signal. b Step B002: The vehicle determines whether the current mode is driving mode or braking mode according to the vehicle speed and pedal opening. Specifically, it is determined that v>0.1 kph and P b >0.5%, if yes, go to B003, that is, enter the braking mode. If no, go to B004, that is, enter the driving mode.

[0056] After B005 enters the braking mode, the controller determines whether the motor should be involved according to the current battery SOC and vehicle speed. The controller can be a controller of the entire vehicle. Specifically, the controller receives the battery SOC, vehicle speed v, braking intensity a and brake pedal opening P transmitted via CAN signals. bValue, the control module provided in this application can be integrated into the controller of the whole vehicle. Specifically, it is determined that SOC>98% or v<3kph. If so, enter B007 and perform mechanical braking. That is, when the whole vehicle is gliding at a low speed or in a high SOC state, the electric drive braking does not intervene. At this time, the braking force of the front and rear axles is judged by the braking intensity, that is, step B010, to determine whether a is <0.3g, if so, enter step B017. If not, that is, when it is higher than the emergency braking intensity threshold, the whole vehicle is in an emergency braking state, enter step B009, and the front and rear axles are allocated braking force according to the state when they are locked at the same time (that is, the braking I curve), and further enter step B016 to perform non-drive shaft hydraulic braking. Enter step B015, the braking force of the drive shaft is completely achieved by the brake servo motor 20 pressing the brake disc 15. Specifically, the braking force of the front and rear axles under non-emergency braking is distributed according to a calibrated fixed ratio.

[0057] When SOC>98% or v<3kph in B005, if it is no, then enter step B006 to further determine whether a<0.3g; if not, enter step B009, if yes, enter B008, the brake intervention of the electric drive assembly 1, B011 the electric drive assembly 1 determines the upper limit of the electric braking torque according to the current vehicle speed, that is, whether the motor force is sufficient, if the required braking torque does not exceed this upper limit, enter step B012, the braking energy is completely converted into electrical energy by the motor. If not, enter step B013, the motor provides the maximum braking torque, and then enter step B014 to make up for the braking force by pressing the brake disc 15 by the brake servo motor 20 in the electric drive, that is, enter step B015.

[0058] The present application integrates the mechanical brake assembly into the electric drive assembly 1, achieving a high degree of integration of the electric drive system. First, since the electric drive brake itself can fully provide the required braking force, the brake disc 15, brake caliper and corresponding hydraulic pipelines of the electric drive action shaft in the electric drive brake can be omitted, reducing the space occupied by the wheel side layout and reducing the cost of the whole vehicle. At the same time, due to the cancellation of the original hydraulic brake structure, the wheel side will have more layout space, which is conducive to the layout of systems such as steering and suspension.

[0059] Secondly, since the mechanical brake assembly 10 acts on the main shaft of the power motor 14, and the brake servo motor 20 provides pressure through the worm gear and ball screw structure, the power and torque of the brake servo motor 20 do not need to be very high, which can reduce the energy consumption and space occupation of the brake system, and thus can replace the electronic parking device to complete the parking function. That is, the torque transmitted to the power motor 14 by the mechanical brake assembly 10 is reduced, that is, due to the effect of the reduction ratio (the ratio of the loads at both ends of the reducer is equal to the speed ratio), which is conducive to reducing the demand for the braking force of the mechanical brake assembly 10.

[0060] In a specific embodiment, if the mechanical brake assembly 10 is installed at the wheel end, there will be a huge challenge in heat dissipation. However, if it is integrated at the power motor 14, it can share the heat dissipation system of the electric drive brake, greatly reducing the risk of failure of the system due to excessive temperature. Finally, since the traditional calipers and brake discs are eliminated, the resistance torque of the transmission system will be further reduced, which is conducive to improving the overall efficiency of the electric drive system.

[0061] The present application provides a vehicle including a brake device, wherein the brake device is any of the above-mentioned brake devices. The above text describes the specific structure of the brake device, and the present application includes the above-mentioned brake device, and also has the above-mentioned technical effects.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A braking device for an electric vehicle, characterized in that: The invention comprises an electric drive assembly (1), wherein the electric drive assembly (1) comprises: Power motor (14); A power battery, the power battery being connected to the power motor (14); A deceleration component (13), wherein the main shaft of the output end of the power motor (14) is connected to the input end of the deceleration component (13), and the output end of the deceleration component (13) is drivingly connected to the wheel (9); when the electric vehicle brakes, the power motor (14) is used to charge the power battery; A mechanical brake assembly (10), the mechanical brake assembly (10) comprising a mechanical drive module, a pressure plate (16), and a brake disc (15), wherein the brake disc (15) is fixedly connected to the end of the main shaft, the pressure plate (16) is connected to the output end of the mechanical drive module, and the mechanical drive module drives the pressure plate (16) to approach and move away from the brake disc (15); when the pressure plate (16) abuts against the brake disc (15), the mechanical drive module provides a braking force for the wheel (9).

2. The braking device of the electric vehicle according to claim 1, characterized in that: The mechanical drive module comprises: Braking servo motor (20); An axis transmission device (17), the axis transmission device (17) being connected to the pressure plate (16) to drive the pressure plate (16) to move closer to and away from the brake disc (15); A worm gear assembly, wherein the input end of the worm gear assembly is connected to the output end of the brake servo motor (20), and the output end of the worm gear assembly is connected to the axis transmission device (17).

3. The braking device of the electric vehicle according to claim 2, characterized in that: The axis transmission device (17) includes a ball screw, the worm (19) of the worm gear assembly is connected to the output end of the brake servo motor (20), the worm wheel (18) of the worm gear assembly is connected to the ball screw, and the ball screw is connected to the pressure plate (16).

4. The braking device of the electric vehicle according to claim 2, characterized in that: It also includes a control module, the mechanical brake assembly (10) also includes a pressure sensor (21), the axis transmission device (17) and the pressure plate (16) are connected via the pressure sensor (21), and the brake servo motor (20), the pressure sensor (21) and the power motor (14) are all connected to the control module signal.

5. The braking device of the electric vehicle according to claim 2, characterized in that: The main bodies of the mechanical drive module and the power motor (14) are respectively arranged on opposite sides of the main shaft axis direction, and the brake servo motor (20) is close to the reduction assembly (13) relative to the worm gear assembly.

6. The braking device of the electric vehicle according to claim 2, characterized in that: When the electric vehicle is in a parking state, the pressure plate (16) abuts against the brake plate (15), and the mechanical drive module provides a second braking force to the wheel (9).

7. The braking device of the electric vehicle according to claim 2, characterized in that: The electric drive assembly (1) further comprises: Differential (11); A half shaft (12), wheels (9) are mounted on opposite sides of the half shaft (12) in the axial direction, and the reduction assembly (13) is connected to the half shaft (12) through the differential (11).

8. The braking device of an electric vehicle according to claim 1, characterized in that: It also includes a brake assembly and a hydraulic brake assembly, wherein one of the hydraulic brake assembly and the electric drive assembly (1) is connected to the front wheel (8) of the electric vehicle through transmission, and the other is connected to the rear wheel (2) of the electric vehicle through transmission, and both the hydraulic brake assembly and the electric drive assembly (1) are connected to the brake assembly through signals.

9. The braking device of an electric vehicle according to any one of claims 1 to 8, characterized in that: The power motor (14), the mechanical brake assembly (10) and the deceleration assembly (13) are integrated.

10. A vehicle, comprising a braking device, characterized in that: The braking device is a braking device of an electric vehicle according to any one of claims 1 to 9.

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