Motor structure for electro-mechanical braking (EMB) system

Abstract

The utility model belongs to the technical field of brake-by-wire systems, and particularly relates to a motor structure for a mechano-electronic brake (EMB) system, which comprises a stator assembly, a rotor assembly, a bearing, a bearing clearance adjusting nut and an end cover, the end cover is provided with a bearing chamber, the bearing is arranged in the bearing chamber, the rotor assembly comprises a rotor and a motor shaft, the stator assembly sleeves the rotor, the motor shaft is connected with the bearing in a running fit manner, the bearing clearance adjusting nut is connected with the motor shaft, and the bottom surface of the bearing clearance adjusting nut is attached to the end surface of the bearing. Only one bearing is installed on the motor shaft at the output end of the rotor assembly for supporting, a bearing at the rear end of the motor shaft is omitted, and the axial size of the motor is shortened; meanwhile, the bearing clearance adjusting nut is designed on the outer side of the bearing, the expected bearing clearance can be achieved by controlling the torque of the bearing clearance adjusting nut, and therefore swinging of the rotor in the high-speed rotating process is better weakened.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of wire control brake system, especially relates to a motor structure for mechanical electronic brake EMB system. BACKGROUND

[0002] The EMB brake motor is the driving core of the electronic mechanical brake (EMB) system. The EMB system is a modern vehicle braking technology that combines the advantages of electric drive and mechanical braking to achieve efficient, precise, and sensitive braking performance. In this system, the role of the brake motor is to convert energy into mechanical force through electrical signals to drive the brake to work. By controlling the current of the motor stator, the speed and direction of the motor are accurately adjusted to achieve precise control of the brake. The closed-loop control method is usually used, that is, the real-time speed and position of the motor are monitored by the sensor, and the control signal is adjusted in real time according to the preset value to ensure the accuracy of the braking force. The core of motor control is fast response, compared with the traditional hydraulic system, the motor can provide faster response speed, and realize more sensitive braking effect

[0003] The traditional motor rotor support structure needs to install one bearing on each end of the motor shaft, which leads to a large axial size of the motor shaft, which is not conducive to the arrangement of the EMB motor on the whole vehicle. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a kind of motor structures for mechanical electronic brake EMB system, only one support bearing is installed on the motor shaft of rotor assembly output end of the utility model, cancel the bearing of motor shaft rear end, so that the axial size of motor can be shortened, it is conducive to the arrangement of EMB motor on the whole vehicle.

[0005] Technical scheme: in order to realize the above-mentioned purpose, the utility model provides a kind of motor structure for mechanical electronic brake EMB system, including stator assembly, rotor assembly, bearing, bearing play adjusting nut and end cover;

[0006] The end cover is provided with bearing chamber, and the bearing is arranged in the bearing chamber, the rotor assembly includes rotor and motor shaft, the stator assembly is sleeved outside the rotor, the motor shaft is rotatably connected with the bearing, the bearing play adjusting nut is connected with the motor shaft, and the bottom surface of the bearing play adjusting nut is attached to the end surface of the bearing.

[0007] The utility model only installs one bearing on the motor shaft of rotor assembly output end for support, cancels the bearing of motor shaft rear end, realizes the shortening of the axial size of motor;Meanwhile, a bearing play adjusting nut is designed outside the bearing, and the expected bearing play can be realized by controlling the torque of the bearing play adjusting nut, so that the swing of the rotor in the high-speed rotating process is better weakened.

[0008] Further, the rotor is in interference fit with the motor shaft, the motor shaft is provided with external threads, and the bearing clearance adjusting nut is connected with the motor shaft through the external threads.

[0009] Further, the bearing is a four-point angular contact bearing, the outer ring of the four-point contact angular bearing is pressed into the bearing chamber through interference, the motor shaft is pressed into the inner ring of the four-point contact angular bearing through interference fit, and the bottom surface of the bearing clearance adjusting nut is attached to the end surface of the inner ring of the four-point contact angular bearing.

[0010] Further, the bearing clearance adjusting nut comprises a flange surface and an external hexagonal nut on the upper part of the flange surface, and the bottom surface of the flange surface is attached to the end surface of the inner ring of the four-point contact angular bearing. The flange surface is attached to the end surface of the inner ring of the four-point contact angular bearing for transmitting torque on the bearing, so as to achieve the purpose of adjusting the clearance thereof, and the external hexagonal nut is arranged to facilitate adjustment of the torque of the bearing clearance adjusting nut.

[0011] Further, the end of the motor shaft is provided with a gear, the end surface of the motor shaft is provided with a central blind hole, and a sensing magnet is pressed into and mounted in the blind hole. The gear is used for transmitting torque of the motor to the brake, and the sensing magnet is used for identifying the position of the motor rotor.

[0012] Further, the motor further comprises a shell, the stator assembly is pressed into the shell through shrink fit interference, the stator assembly is connected with a bus bar, the bus bar is provided with a metal buckle, and each outgoing line resistor on the stator assembly is welded to the metal buckle.

[0013] Further, there is an air gap between the stator assembly and the rotor assembly. The air gap is used for rotation of the rotor assembly.

[0014] The above technical scheme can be seen that the utility model has the following beneficial effects:

[0015] 1. The utility model provides a micro-stroke pedal for new energy vehicle, compact structure, only one bearing is installed on the motor shaft of the motor rotor assembly output end, the bearing at the rear end of the motor shaft is cancelled, so that the motor shaft size can be shortened, and it is favorable for the arrangement of the EMB motor on the whole vehicle.

[0016] 2. The utility model discloses a bearing clearance adjusting nut on the outside of the bearing, the torque of the bearing clearance adjusting nut can be controlled to realize the expected bearing clearance, so that the swing of the rotor in the high-speed rotation process can be better weakened. DRAWINGS

[0017] Fig. 1 It is an explosion view of the motor structure for the mechanical electronic brake EMB system;

[0018] Fig. 2 This is a cross-sectional view of a motor structure for an electromechanical braking EMB system according to the present invention.

[0019] Fig. 3 This is a schematic diagram of the bearing clearance adjusting nut described in this utility model.

[0020] In the diagram: 100-Stator assembly, 200-Rotor assembly, 201-Rotor, 202-Motor shaft, 300-Bearing, 400-Bearing clearance adjusting nut, 401-Flange surface, 402-External hexagonal nut, 500-End cover, 600-Gear, 700-Sensing magnet, 800-Housing, 900-Bus. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] like Figs. 1-3 As shown: A motor structure for an electromechanical braking (EMB) system includes a stator assembly 100, a rotor assembly 200, a bearing 300, a bearing clearance adjusting nut 400, and an end cover 500.

[0023] The end cover 500 is provided with a bearing chamber, the bearing 300 is disposed in the bearing chamber, the rotor assembly 200 includes a rotor 201 and a motor shaft 202, the stator assembly 100 is sleeved on the outside of the rotor 201, the motor shaft 202 is rotatably connected to the bearing 300, the bearing clearance adjusting nut 400 is connected to the motor shaft 202, and the bottom surface of the bearing clearance adjusting nut 400 is in contact with the end face of the bearing 300.

[0024] In this embodiment, only one bearing 300 is provided on the motor shaft 202 of the rotor assembly 200, eliminating the bearing at the rear end of the motor shaft 202. This shortens the axial dimension of the motor, which is beneficial for the arrangement of the EMB motor in the vehicle. In addition, a bearing clearance adjusting nut 400 is designed on the outside of the bearing 300. The desired bearing clearance can be achieved by controlling the torque of the bearing clearance adjusting nut 400, thereby better reducing the swaying of the rotor during high-speed rotation.

[0025] The rotor 201 is interference-fitted with the motor shaft 202, and the motor shaft 202 is provided with an external thread. The bearing clearance adjusting nut 400 is connected to the motor shaft 202 through this external thread. The rotor 201 and the motor shaft 202 are interference-fitted, and the motor shaft 202 can rotate coaxially with the rotor 201.

[0026] Further optimization scheme, the bearing 300 is four point contact angle bearing, the outer ring of the four point contact angle bearing is pressed into the bearing chamber by interference, the motor shaft 202 is pressed into the inner ring of the four point contact angle bearing by gap fit, the bottom surface of the bearing clearance adjusting nut 400 is attached to the end surface of the inner ring of the four point contact angle bearing. The bearing clearance adjusting nut 400 includes a flange surface 401 and an outer hexagonal nut 402 on the upper part of the flange surface 401, and the bottom surface of the flange surface 401 is attached to the end surface of the inner ring of the four point contact angle bearing. Bearing clearance refers to the clearance inside the bearing (steel ball between the inner and outer raceways), the bearing clearance adjusting nut 400 is threadedly connected with the motor shaft 202, and the bottom surface thereof is attached to the end surface of the inner ring of the bearing 300, so that the gap size of the inner ring and the outer ring of the bearing can be controlled by applying different torques.

[0027] Wherein, the end of the motor shaft 202 is provided with a gear 600, and a center blind hole is formed in the end surface of the motor shaft 202, and a sensing magnet 700 is press-fitted in the blind hole. The sensing magnet 700 is matched with a chip on a PCBA and is used for identifying the position of the motor rotor, which is a conventional technical means and will not be described in detail.

[0028] Specifically, further comprising a shell 800, the stator assembly 100 is press-fitted into the shell 800 by shrinkage interference, the stator assembly 100 is connected with a busbar 900, the busbar is provided with a metal buckle, and the metal buckle is welded with each outgoing resistor on the stator assembly 100.

[0029] In addition, there is an air gap between the stator assembly 100 and the rotor assembly 200.

[0030] The motor structure for the mechanical electronic brake EMB system has small axial size and radial size, the magnetic pull generated between the stator assembly 100 and the rotor assembly 200 is small, a single bearing can be supported, installation space is saved, and the bearing clearance adjusting nut 400 is arranged to ensure stable operation of the motor shaft 202.

[0031] The above only describes preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements can be made without departing from the principles of the present application, and these improvements should also be regarded as the protection scope of the present application.

Claims

1. An electric motor structure for an electromechanical brake (EMB) system, characterized by, The motor comprises a stator assembly (100), a rotor assembly (200), a bearing (300), a bearing play adjusting nut (400) and an end cover (500). The end cover (500) is provided with a bearing chamber, the bearing (300) is arranged in the bearing chamber, the rotor assembly (200) comprises a rotor (201) and a motor shaft (202), the stator assembly (100) is sleeved outside the rotor (201), the motor shaft (202) is rotationally connected with the bearing (300), the bearing play adjusting nut (400) is connected with the motor shaft (202), and the bottom surface of the bearing play adjusting nut (400) is attached to the end surface of the bearing (300).

2. The motor structure for an electromechanical brake (EMB) system according to claim 1, wherein The rotor (201) is in interference fit with the motor shaft (202), the motor shaft (202) is provided with external threads, and the bearing play adjusting nut (400) is connected with the motor shaft (202) through the external threads.

3. The motor structure for an electromechanical brake (EMB) system according to claim 1, wherein The bearing (300) is a four-point angular contact bearing, the outer ring of the four-point angular contact bearing is pressed into the bearing chamber through interference, the motor shaft (202) is pressed into the inner ring of the four-point angular contact bearing through clearance fit, and the bottom surface of the bearing play adjusting nut (400) is attached to the end surface of the inner ring of the four-point angular contact bearing.

4. The motor structure for an electromechanical brake (EMB) system according to claim 3, wherein The bearing play adjusting nut (400) comprises a flange surface (401) and an external hexagonal nut (402) on the upper portion of the flange surface (401), and the bottom surface of the flange surface (401) is attached to the end surface of the inner ring of the four-point angular contact bearing.

5. The motor structure for an electromechanical brake (EMB) system according to claim 1, wherein The end of the motor shaft (202) is provided with a gear (600), the end surface of the motor shaft (202) is provided with a central blind hole, and a sensing magnet (700) is pressed into and mounted in the blind hole.

6. The motor structure for an electromechanical brake (EMB) system according to claim 1, wherein The motor further comprises a housing (800), the stator assembly (100) is pressed into the housing (800) through shrink fit interference, the stator assembly (100) is connected with a bus bar (900), the bus bar is provided with a metal buckle, and the metal buckle is welded with each outgoing resistor on the stator assembly (100).

7. The motor structure for an electromechanical brake (EMB) system according to claim 1, wherein There is an air gap between the stator assembly (100) and the rotor assembly (200).

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