Automotive outer rotor brushless motor

Abstract

A vehicle outer rotor brushless motor comprises a shell assembly, a rotor assembly and a stator assembly, the shell assembly comprises a shell, a motor shaft bearing and an end cover, the closed end of the shell is provided with a bearing chamber, the motor shaft bearing is fixed in the bearing chamber, the open end of the shell is fixed with the end cover, the end cover is provided with the bearing chamber, and the motor shaft bearing is fixed in the bearing chamber. The motor shaft bearing is fixed in a bearing chamber arranged in the end cover, the rotor assembly comprises a motor shaft, a rotor shell and a rotor permanent magnet, the rotor permanent magnet is fixed in the rotor shell, the rotor shell is fixed on the motor shaft, and two ends of the motor shaft are respectively supported by the motor shaft bearing in the closed end of the shell and the motor shaft bearing in the end cover in a rolling manner. The stator assembly comprises a hollow shaft, a stator bearing, a stator lamination component, a PCB module and a fixing ring; and the hollow shaft is fixed in a hollow shaft fixing hole formed in the end cover. The external rotor brushless motor for the vehicle can ensure the reliability of the operation of the motor, and meets the waterproof and dustproof requirements of the vehicle for the motor for the vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a vehicle outer rotor brushless motor. BACKGROUND

[0002] With the continuous improvement of the degree of automation of the automobile, the application of motor on the automobile is more and more extensive, most of the tailgate motor, side door motor, glass lifting motor, sunroof motor, fan motor, charging (refueling) small door motor, electronic water pump motor, air pump motor etc. currently used still adopt DC brush motor, and the defects of short service life and EMC electromagnetic interference affecting other electronic equipment or control system of the vehicle are widespread, although there are also brushless motors, because the motor adopts inner rotor structure, the rotational inertia of the rotor is small, resulting in low power density of the motor, although it can be used for position control of the control system, but the motor used on the automobile as power transmission has problems such as unstable speed and vibration.

[0003] The motor rotor assembly is an outer rotor structure, which can increase the rotational radius of the rotor assembly, improve the rotational inertia and the power density of the motor, and make the motor as power transmission more stable in operation.

[0004] However, the existing outer rotor brushless motor directly uses the rotor shell as the shell of the motor, which has poor sealing performance, poor foreign matter and liquid resistance, and therefore is not suitable for use in vehicles. SUMMARY

[0005] The utility model wants to solve the technical problem of overcoming the above-mentioned defects of prior art and providing a vehicle outer rotor brushless motor, which has good sealing performance and good foreign matter and liquid resistance.

[0006] The utility model adopts the technical scheme for solving the above technical problem:

[0007] A vehicle outer rotor brushless motor, comprising a shell assembly, a rotor assembly and a stator assembly, the shell assembly comprises a shell, a motor shaft bearing and an end cover, the shell closed end is provided with a bearing chamber, the motor shaft bearing is fixed in the bearing chamber, the shell open end is fixed with the end cover, the end cover is provided with a bearing chamber, and the motor shaft bearing is fixed in the bearing chamber provided in the end cover, the rotor assembly comprises a motor shaft, a rotor shell and a rotor permanent magnet, the rotor permanent magnet is fixed in the rotor shell, and the rotor shell is fixed on the motor shaft, the two ends of the motor shaft are respectively supported by the motor shaft bearing in the shell closed end and the motor shaft bearing in the end cover, and the stator assembly comprises a hollow shaft, a stator bearing, a stator lamination component, a PCB circuit board module and a fixing ring, and the hollow shaft is fixed in the hollow shaft fixing hole provided in the end cover.

[0008] Better, the fixing ring is fixed in the fixing ring fixing hole of the end cover, the PCB circuit board module is fixed on the ring opening of the fixing ring, the wire harness opening is arranged on the end cover and the wire harness sleeve is sleeved on the wire harness opening, and the PCB circuit board module, the fixing ring, the end cover and the wire harness sleeve form a substantially closed space, so that foreign matters or liquids can be effectively prevented from entering the motor, and the motor is prevented from being abnormal or invalid.

[0009] Better, the sealing ring I is arranged between the end cover and the shell, so that sealing is better, and foreign matters or liquids can be effectively prevented from entering the motor, and the motor is prevented from being abnormal or invalid.

[0010] Better, the sealing ring II is arranged outside the end cover, and when the motor end cover is connected with external components, the motor can still be effectively sealed, foreign matters or liquids can be effectively prevented from entering the motor, and the motor is prevented from being abnormal or invalid.

[0011] Better, the length of the hollow shaft fixing hole is long enough, so that the hollow shaft can be effectively supported.

[0012] Better, the axial center of the stator lamination component and the axial center of the rotor permanent magnet of the rotor assembly are spaced apart by a distance L=0.5-1.5mm, the gasket chamber is arranged outside the bearing chamber, the gasket is fixed in the gasket chamber, and the motor shaft is on the gasket, so that when the motor works, the motor shaft and the rotor assembly are subjected to magnetic pulling force along the axial direction to the left side, so that the left end of the motor shaft is tightly attached to the end face of the gasket, the axial movement of the rotor assembly is prevented, and vibration and noise reduction functions are achieved.

[0013] Better, the gasket is made of elastic wear-resistant material, so that the vibration and noise reduction effect during the operation of the motor is better.

[0014] Better, the flat surfaces are symmetrically arranged on both sides of the gasket, and the lubricant is stored in the space position formed by the flat surfaces and the gasket chamber, so that the service life of the motor is further prolonged.

[0015] Better, the cover is further arranged, and the cover is fixed on the end cover, so that foreign matters or liquids can be effectively prevented from entering the motor, and the motor is prevented from being abnormal or invalid.

[0016] Compared with the prior art, the utility model has the advantages that the shell and the end cover are arranged, the rotor assembly and the stator assembly are sealed in the shell, foreign matters and liquids can be better prevented from entering the motor to cause abnormality or invalidation, the reliability of the motor during operation is ensured, and the waterproof and dustproof requirements of the motor for the automobile are met. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of an outer rotor brushless motor.

[0018] Figure 2 is an exploded view of a brushless motor with outer rotor of an embodiment of the present application.

[0019] Figure 3 is a gasket view of a brushless motor with outer rotor of an embodiment of the present application.

[0020] Figure 4 is a rotor shell view of a brushless motor with outer rotor of an embodiment of the present application.

[0021] Figure 5 is a PCB board module view of a brushless motor with outer rotor of an embodiment of the present application.

[0022] Figure 6 is a fixing ring view of a brushless motor with outer rotor of an embodiment of the present application.

[0023] Figure 7 is an end cover view of a brushless motor with outer rotor of an embodiment of the present application.

[0024] Figure 8 is a machine cover view of a brushless motor with outer rotor of an embodiment of the present application.

[0025] Explanation of reference numerals in the drawing: 1, housing assembly; 101, housing; 1011, end face; 1012, inner circular face; 1013, bearing chamber; 1014, gasket chamber; 102, cylindrical bearing; 103, gasket; 1031, outer circular face; 1032, end face; 1033, flat face; 2, rotor assembly; 201, motor shaft; 2011, outer circular face; 2012, ball head face; 202, rotor housing; 2021, inner circular face; 2022, outer circular face; 2023, shaft hole; 203, rotor permanent magnet; 2031, inner circular face; 2032, outer circular face; 3, stator assembly; 301, hollow shaft; 3011, inner circular face; 3012, outer circular face; 302, stator lamination component; 3021, inner circular face; 3022, outer circular face; 303, stator winding; 3031, wire end; 304, PCB circuit board module; 3041, upper end face; 3042, enameled wire hole; 3043, power supply wire hole; 3044, control wire hole; 3045, positioning groove; 305, fixing ring; 3051, fixing hole; 3052, positioning face; 3053, positioning boss; 3054, wire harness port; 3055, annular positioning face; 3056, outer circular face; 306, sealing ring I; 307, end cover; 3071, annular groove; 3072, upper end face; 3073, inner circular face; 3074, inner circular face; 3075, bearing chamber; 3076, annular groove; 3077, lower end face; 3078, fixing hole; 3079, fixing hole; 30710, outer circular face; 30711, wire harness port; 30712, fixing face; 308, sealing ring II; 309, machine cover; 3091, positioning face; 3092, outer circular face; 310, cylindrical bearing; 311, wire harness; 3111, power supply wire; 3112, control wire; 312, wire outlet sleeve; 313, fixing screw. DETAILED DESCRIPTION

[0026] The utility model will be further described below in combination with the drawings and examples.

[0027] As Figures 1-8 shown in the drawing, a vehicle protection type outer rotor brushless motor comprises a housing assembly 1, a rotor assembly 2 and a stator assembly 3.

[0028] The housing assembly 1 comprises a housing 101, a cylindrical bearing 102 and a gasket 103, and an end cover 307.

[0029] The cylindrical bearing 102 is arranged at the left end center of the housing assembly 1, and the cylindrical bearing 310 is arranged at the right end center of the stator assembly 3, which respectively cooperate with the two ends of the motor shaft 201 arranged by the rotor assembly 2 to support the motor shaft 201, and the rotor assembly 2 can rotate in the circumferential direction.

[0030] One end of the housing 101 is closed, and the other end is open.

[0031] The bearing chamber 1013 is arranged at the closed end of the shell 101, and the cylindrical bearing 102 is fixed in the bearing chamber 1013 of the shell 101 by interference fit.

[0032] The gasket chamber 1014 is arranged outside the bearing chamber 1013 at the closed end of the shell 101, and the gasket 103 is fixed in the gasket chamber 1014 of the shell 101 by interference fit.

[0033] The gasket 103 is made of elastic wear-resistant material. During the operation of the motor, the left end of the motor shaft 201 is on the gasket 103, and the damping and noise reduction effect of the gasket 103 is better.

[0034] The gasket 103 is provided with flat surfaces 1033 on both sides, and a space is formed between the flat surfaces 1033 and the gasket chamber 1014. The space can store lubricating grease and provide lubricating grease for lubricating the cylindrical bearing 102 and the motor shaft 201 at any time, so that the cylindrical bearing 102 and the motor shaft 201 can work optimally, thereby prolonging the service life of the motor.

[0035] The open end of the shell 101 is mounted on the end cover 307. Specifically, the inner circular surface 1012 of the shell 101 is fixed together with the outer circular surface 30710 of the end cover 307 by interference fit, and the end surface 1011 of the shell 101 is matched with the fixing surface 30712 of the end cover 307 to axially position the shell 101, and the shell 101 is fixed with the end cover 307 through the fixing screw 313.

[0036] The end cover 307 is also provided with a hollow shaft fixing hole 3079, and one end of the hollow shaft 301 is provided with an outer circular surface 3012 which is fixed in the hollow shaft fixing hole 3079 by interference fit, so as to ensure the coaxiality of the shell assembly 1 and the stator assembly 3 after assembly.

[0037] The length of the hollow shaft fixing hole 3079 is relatively long, which can effectively support the hollow shaft 301.

[0038] The rotor assembly 2 is arranged in the inner cavity of the shell 101.

[0039] The rotor assembly 2 comprises a motor shaft 201, a rotor shell 202 and a rotor permanent magnet 203.

[0040] The rotor permanent magnet 203 is provided with an outer circular surface 2032, and the rotor shell 202 is provided with a corresponding inner circular surface 2021. The rotor permanent magnet 203 is fixed in the rotor shell 202 by interference fit.

[0041] The rotor shell 202 is provided with a shaft hole 2023 which is interference-fitted with the motor shaft 201 to fix the motor shaft 201 on the motor 201.

[0042] The stator assembly 3 comprises a hollow shaft 301, a stator lamination component 302, a stator winding 303, a PCB circuit board module 304, a fixing ring 305, a sealing ring I 306, an end cover 307, a sealing ring II 308, a machine cover 309, a cylindrical bearing 310, a wire harness 311, a wire outlet sleeve 312 and a fixing screw 313.

[0043] The cylindrical bearing 310 is fixed in the bearing chamber 3075 provided in the end cover 307 by interference fit.

[0044] The outer circular surface 3056 of the fixing ring 305 is fixed on the end cover 307 by interference fit through the fixing hole 3078 provided in the end cover 307, and the annular positioning surface 3055 provided in the fixing ring 305 is matched with the lower end surface 3077 of the end cover 307 for axial positioning.

[0045] The sealing ring I 306 is arranged between the housing 101 and the end cover 307, specifically, the sealing ring I 306 is installed in the annular groove I 3076 provided in the front part of the end cover 307, so that the sealing performance between the end cover 307 and the housing 101 is good.

[0046] The sealing ring II 308 is installed in the annular groove II 3071 provided in the rear part of the end cover 307, so that the sealing performance between the end cover 307 and the motor installation position is better.

[0047] The inner circular surface 3021 of the stator lamination component 302 is fixed on the hollow shaft 301 by interference fit through the outer circular surface 3012 provided in the hollow shaft 301.

[0048] The stator winding 303 is wound in the stator lamination component 302, and the multiple wire heads 3031 of the stator winding 303 are respectively welded in the multiple enameled wire holes 3042 provided in the PCB circuit board module 304.

[0049] The multiple power supply lines 3111 and control lines 3112 of the wire harness 311 are respectively welded in the multiple power supply line holes 3043 and control line holes 3044 provided in the PCB circuit board module 304.

[0050] The PCB circuit board module 304 is fixed in the fixing ring 305 by interference fit through the fixing hole 3051 provided in the fixing ring 305, and is axially positioned by the positioning surface 3052 provided in the fixing ring 305.

[0051] A plurality of positioning slots 3045 are arranged on the PCB module 304 and cooperate with a plurality of positioning bosses 3053 arranged on the fixing ring 305 to prevent the PCB module 304 from rotating, so that the PCB module 304 is fixed more reliably, and the wire ends 3031 of the stator winding 303 and the power lines 3111 and control lines 3112 of the wire harness 311 welded on the PCB module 304 are prevented from loosening to cause the motor to malfunction or fail, so that the reliability of the motor in operation is ensured.

[0052] The wire harness 311 passes through the wire harness port 3054 arranged on the fixing ring 305 and the wire harness port 30711 arranged on the end cover 307 in sequence and is then led out of the wire outlet sleeve 312 fixed to the wire harness port 30711 of the end cover 307.

[0053] The wire outlet sleeve 312 is installed in the wire harness port 30711.

[0054] The PCB module 304, the fixing ring 305, the wire outlet sleeve 312 and the end cover 307 form a closed space, which can prevent water and dust from entering.

[0055] The outer circular surface 3092 of the cover 309 is fixed to the end cover 307 by interference fit with the inner circular surface 3074 of the end cover 307, and the positioning surface 3091 of the cover 309 is axially positioned with the upper end surface 3072 of the end cover 307.

[0056] The inner circular surface 2031 of the rotor permanent magnet 203 of the rotor assembly 2 and the inner circular surface 3021 of the stator lamination component 302 of the stator assembly 3 form an air gap, and the motor shaft 201 of the rotor assembly 2 and the inner circular surface 3011 of the hollow shaft 301 of the stator assembly 3 and the inner circular surface 3073 of the end cover 307 form gaps, so that the rotor assembly 2 can rotate smoothly and the motor can operate normally.

[0057] The axial center line E of the stator lamination component 302 of the stator assembly 3 and the axial center line N of the rotor permanent magnet 203 of the rotor assembly 2 are arranged at a distance L of 0.5-1.5 mm, the rotor assembly 2 is subjected to a magnetic pull along the axial left side during the operation of the motor, and the ball head surface 2012 of the motor shaft 201 is tightly attached to the end surface 1032 of the gasket 103, so that the rotor assembly 2 is prevented from axially moving and has the functions of vibration reduction and noise reduction.

[0058] The sealing ring I 306 cooperates with the inner circular surface 1012 of the shell 101 to have the waterproof and dustproof function, after the motor is connected with the mechanism, the sealing ring II 308 cooperates with the inner circular surface of the shell of the external connecting member, also has the waterproof and dustproof function, the wire sleeve 312 cooperates with the wire harness port 30711 of the end cover 307, also has the waterproof and dustproof function, effectively prevents foreign matters or liquid from entering into the motor, causes the motor to appear abnormal or failure, ensures the reliability of the motor working operation.

[0059] It should be noted that the directions of the inside, the outside, the left, the right, the upper, the lower and the like in the embodiment and the application file, and the words containing the directions, are only for the convenience of description, and only for the specific direction determined during the description, and do not constitute the limitation of the content and the protection range of the utility model.

Claims

1. An outer rotor brushless motor for a vehicle, characterized by: It includes a shell assembly, a rotor assembly and a stator assembly, the shell assembly includes a shell, a motor shaft bearing, an end cover, the shell closed end is provided with a bearing chamber, the motor shaft bearing is fixed in the bearing chamber, the shell open end is fixed with the end cover, the end cover is provided with a bearing chamber, the motor shaft bearing is fixed in the bearing chamber provided by the end cover, the rotor assembly includes a motor shaft, a rotor shell and a rotor permanent magnet, the rotor permanent magnet is fixed in the rotor shell, the rotor shell is fixed on the motor shaft, the motor shaft is supported by the motor shaft bearing in the shell closed end and the motor shaft bearing in the end cover respectively, the stator assembly includes a hollow shaft, a stator bearing, a stator lamination component, a PCB circuit board module and a fixing ring, the hollow shaft is fixed in the hollow shaft fixing hole provided by the end cover.

2. The vehicle use outer rotor brushless motor according to claim 1, characterized by: The fixing ring is fixed in the fixing ring fixing hole provided by the end cover, the PCB circuit board module is fixed on the ring port of the fixing ring, the end cover is provided with a wire harness port and a wire outlet sleeve is sleeved on the wire harness port, the PCB circuit board module, the fixing ring, the end cover and the wire outlet sleeve form a substantially closed space.

3. The vehicle use outer rotor brushless motor according to claim 1, characterized in that: The sealing ring I is arranged between the end cover and the shell.

4. The vehicle use outer rotor brushless motor according to claim 1, characterized by: The sealing ring II is arranged outside the end cover.

5. The vehicle use outer rotor brushless motor according to claim 1, wherein: The length of the hollow shaft fixing hole is long enough.

6. The vehicle use outer rotor brushless motor according to claim 1, wherein: The axial center of the stator lamination component and the axial center of the rotor permanent magnet of the rotor assembly are spaced apart by a distance L=0.5-1.5mm, the bearing chamber is provided with a gasket chamber, the gasket is fixed in the gasket chamber, and the motor shaft is supported on the gasket.

7. The vehicle use outer rotor brushless motor as claimed in claim 6, wherein: The gasket is made of elastic wear-resistant material.

8. The vehicle use outer rotor brushless motor as defined in claim 6, wherein: The flat surfaces are symmetrically arranged on both sides of the gasket, and the lubricant is stored in the space formed by the flat surfaces and the gasket chamber.

9. The vehicle use outer rotor brushless motor according to claim 1, wherein: A machine cover is further provided, and the machine cover is fixed on the end cover.

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