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 invention relates to the technical field of motors, and in particular to an outer rotor brushless motor for a vehicle. Background Art

[0002] With the continuous improvement of the degree of automobile automation, the application of motors in automobiles is becoming more and more extensive. Most of the tailgate motors, side door motors, glass lifting motors, sunroof motors, fan motors, charging (refueling) door motors, electronic water pump motors, air pump motors, etc. currently used still use DC brushed motors, which generally have the defects of short service life and EMC electromagnetic interference affecting other electronic equipment or control systems in the vehicle. Although brushless motors are also used, because the motor uses an inner rotor structure, the rotor's moment of inertia is small, resulting in a low power density of the motor. Although it can be used for position control in the control system, the motor used as power transmission in the car will have problems such as unstable speed and vibration.

[0003] The motor rotor assembly is an outer rotor structure, which can increase the rotation radius of the rotor assembly, increase the moment of inertia, and improve the power density of the motor. As a power transmission motor, it can make its operation more stable.

[0004] However, the existing outer rotor brushless motor directly uses the rotor housing as the motor housing, and has poor sealing performance and poor performance in preventing foreign matter and liquid. Therefore, it is not suitable for use in vehicles. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a vehicle outer rotor brushless motor with good sealing performance and good foreign body and liquid resistance.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: A vehicle outer rotor brushless motor comprises a housing assembly, a rotor assembly and a stator assembly, wherein the housing assembly comprises a housing, a motor shaft bearing and an end cover, a bearing chamber is arranged at the closed end of the housing, the motor shaft bearing is fixed in the bearing chamber, the open end of the housing is fixed to the end cover, the end cover is arranged with a bearing chamber, the motor shaft bearing is fixed in the bearing chamber arranged in the end cover, the rotor assembly comprises a motor shaft, a rotor housing and a rotor permanent magnet, the rotor permanent magnet is fixed in the rotor housing, the rotor housing is fixed on the motor shaft, two ends of the motor shaft are rollingly supported by the motor shaft bearing in the closed end of the housing and the motor shaft bearing in the end cover respectively, 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 a hollow shaft fixing hole arranged in the end cover.

[0007] Preferably, the fixing ring is fixed in a fixing ring fixing hole provided in the end cover, the PCB circuit board module is fixed on the ring opening of the fixing ring, a wiring harness opening is provided on the end cover and a wire outlet sleeve is sleeved on the wiring harness opening, and the PCB circuit board module, the fixing ring, the end cover and the wire outlet sleeve form a roughly closed space, which can effectively prevent foreign matter or liquid from entering the interior of the motor and causing the motor to malfunction or fail.

[0008] Preferably, a sealing ring I is provided between the end cover and the housing, so that the seal is better and foreign matter or liquid can be effectively prevented from entering the interior of the motor and causing the motor to malfunction or fail.

[0009] Preferably, a sealing ring II is arranged outside the end cover, and when the motor end cover is connected to an external component, the motor can still be effectively sealed, and foreign matter or liquid can be effectively prevented from entering the motor and causing the motor to malfunction or fail.

[0010] Preferably, the length of the hollow shaft fixing hole is long enough to effectively support the hollow shaft.

[0011] Preferably, the distance between the axial center of the stator lamination component and the axial center of the rotor permanent magnet of the rotor assembly is L=0.5~1.5mm, and a gasket chamber is arranged outside the bearing chamber, the gasket is fixed in the gasket chamber, and the motor shaft is supported on the gasket. In this way, when the motor is working, the motor shaft and its rotor assembly will be subjected to a magnetic pulling force axially to the left, so that the left end of the motor shaft is close to the end face of the gasket, thereby preventing axial movement of the rotor assembly and having the function of reducing vibration and noise.

[0012] Preferably, the gasket is made of elastic and wear-resistant material, which can achieve better vibration and noise reduction effects during the operation of the motor.

[0013] Preferably, flat surfaces are symmetrically arranged on both sides of the gasket, and lubricant is stored in the space formed by the flat surfaces and the gasket chamber, which can further extend the service life of the motor.

[0014] Preferably, a machine cover is provided, which is fixed on the end cover, and can effectively prevent foreign matter or liquid from entering the interior of the motor and causing the motor to malfunction or fail.

[0015] Compared with the prior art, the advantages of the present invention are: due to the provision of a housing and an end cover, the rotor assembly and the stator assembly are sealed in the housing, which can better prevent foreign matter and liquid from entering the interior of the motor and causing abnormalities or failures, thereby ensuring the reliability of the motor's operation and meeting the automobile's requirements for waterproof and dustproof motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an outer rotor brushless motor according to an embodiment of the present invention.

[0017] Figure 2It is a schematic diagram of an exploded view of an outer rotor brushless motor according to an embodiment of the present invention.

[0018] Figure 3 It is a schematic diagram of a gasket of an outer rotor brushless motor according to an embodiment of the present invention.

[0019] Figure 4 It is a schematic diagram of a rotor housing of an outer rotor brushless motor according to an embodiment of the present invention.

[0020] Figure 5 It is a schematic diagram of a PCB circuit board module of an outer rotor brushless motor according to an embodiment of the present invention.

[0021] Figure 6 It is a schematic diagram of a fixing ring of an outer rotor brushless motor according to an embodiment of the present invention.

[0022] Figure 7 It is a schematic diagram of an end cover of an outer rotor brushless motor according to an embodiment of the present invention.

[0023] Figure 8 It is a schematic diagram of a cover of an outer rotor brushless motor according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the figure: 1. housing assembly; 101. housing; 1011. end surface; 1012. inner cylindrical surface; 1013. bearing chamber; 1014. gasket chamber; 102. cylindrical bearing; 103. gasket; 1031. outer cylindrical surface; 1032. end surface; 1033. flat surface; 2. rotor assembly; 201. motor shaft; 2011. outer cylindrical surface; 2012. ball head surface; 202. rotor housing; 2021. inner cylindrical surface; 2022 , outer cylindrical surface; 2023, shaft hole; 203, rotor permanent magnet; 2031, inner cylindrical surface; 2032, outer cylindrical surface; 3, stator assembly; 301, hollow shaft; 3011, inner cylindrical surface; 3012, outer cylindrical surface; 302, stator lamination component; 3021, inner cylindrical surface; 3022, outer cylindrical surface; 303, stator winding; 3031, wire end; 304, PCB circuit board module; 3041, upper end surface; 3042, enameled wire hole; 3 043, power line hole; 3044, control line hole; 3045, positioning groove; 305, fixing ring; 3051, fixing hole; 3052, positioning surface; 3053, positioning boss; 3054, harness port; 3055, annular positioning surface; 3056, outer cylindrical surface; 306, sealing ring I; 307, end cover; 3071, annular groove; 3072, upper end surface; 3073, inner cylindrical surface; 3074, inner cylindrical surface; 3075, bearing chamber; 3076, annular groove; 3077, lower end surface; 3078, fixing hole; 3079, fixing hole; 30710, outer cylindrical surface; 30711, wiring harness opening; 30712, fixing surface; 308, sealing ring II; 309, machine cover; 3091, positioning surface; 3092, outer cylindrical surface; 310, cylindrical bearing; 311, wiring harness; 3111, power cord; 3112, control line; 312, outlet sleeve; 313, fixing screw. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1-8 As shown, a protective outer rotor brushless motor for a vehicle includes a housing assembly 1, a rotor assembly 2 and a stator assembly 3.

[0027] The housing assembly 1 includes a housing 101 , a cylindrical bearing 102 , a gasket 103 , and an end cover 307 .

[0028] A cylindrical bearing 102 is disposed at the center of the left end of the housing assembly 1, and a cylindrical bearing 310 is disposed at the center of the right end of the stator assembly 3, which respectively cooperate with both ends of the motor shaft 201 disposed on the rotor assembly 2 to support the motor shaft 201, and the rotor assembly 2 can rotate in the circumferential direction.

[0029] The housing 101 is closed at one end and open at the other end.

[0030] A bearing chamber 1013 is disposed at the closed end of the housing 101 , and the cylindrical bearing 102 is fixed in the bearing chamber 1013 of the housing 101 by interference fit.

[0031] A gasket chamber 1014 is arranged outside the bearing chamber 1013 at the closed end of the housing 101 , and the gasket 103 is fixed in the gasket chamber 1014 of the housing 101 by interference fit.

[0032] The gasket 103 is made of elastic wear-resistant material. When the motor is running, the left end of the motor shaft 201 presses against the gasket 103, and the gasket 103 has a better vibration reduction and noise reduction effect.

[0033] Flat surfaces 1033 are arranged on both sides of the gasket 103, and a space is formed between the flat surfaces 1033 and the gasket chamber 1014. Grease can be stored in the space, and grease can be provided at any time to lubricate the cylindrical bearing 102 and the motor shaft 201, so that the cylindrical bearing 102 and the motor shaft 201 can maintain optimal working conditions, thereby extending the service life of the motor.

[0034] The open end of the shell 101 is installed on the end cover 307. Specifically, the inner circular surface 1012 of the shell 101 and the outer circular surface 30710 of the end cover 307 are fixed together by interference fit, and the end surface 1011 of the shell 101 cooperates with the fixing surface 30712 of the end cover 307 to axially position the shell 101 and fix it to the end cover 307 by the fixing screws 313.

[0035] 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 cylindrical surface 3012 which is fixed in the hollow shaft fixing hole 3079 by interference fit, so as to ensure the coaxiality of the housing assembly 1 and the stator assembly 3 after assembly.

[0036] The hollow shaft fixing hole 3079 has a relatively long length, so that the hollow shaft 301 can be effectively supported.

[0037] The rotor assembly 2 is placed in the inner cavity of the housing 101 .

[0038] The rotor assembly 2 includes a motor shaft 201 , a rotor housing 202 and a rotor permanent magnet 203 .

[0039] The rotor permanent magnet 203 is provided with an outer circumferential surface 2032 , and the rotor housing 202 is provided with a corresponding inner circumferential surface 2021 . The rotor permanent magnet 203 is fixed in the rotor housing 202 by interference fit.

[0040] The rotor housing 202 is provided with a shaft hole 2023 which is interference-fitted with the motor shaft 201 , so as to be fixed on the shaft of the motor 201 .

[0041] The stator assembly 3 includes 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 wiring harness 311, a lead sleeve 312 and a fixing screw 313.

[0042] The cylindrical bearing 310 is fixed in the bearing chamber 3075 provided in the end cover 307 by interference fit.

[0043] The outer cylindrical surface 3056 of the fixing ring 305 and the fixing hole 3078 of the end cover 307 are fixed to the end cover 307 by interference fit, and the annular positioning surface 3055 of the fixing ring 305 cooperates with the lower end surface 3077 of the end cover 307 for axial positioning.

[0044] A sealing ring I306 is arranged between the housing 101 and the end cover 307 . Specifically, the sealing ring I306 is installed in an annular groove I3076 arranged at the front of the end cover 307 , so that the sealing performance between the end cover 307 and the housing 101 is good.

[0045] The sealing ring II 308 is installed in the annular groove II 3071 provided at the rear of the end cover 307, so as to improve the sealing performance between the end cover 307 and the motor installation position.

[0046] The inner circumferential surface 3021 of the stator lamination component 302 and the outer circumferential surface 3012 of the hollow shaft 301 are fixed on the hollow shaft 301 by interference fit.

[0047] The stator winding 303 is wound in the stator lamination component 302 , and a plurality of wire ends 3031 of the stator winding 303 are respectively welded in a plurality of enameled wire holes 3042 provided in the PCB circuit board module 304 .

[0048] The multiple power lines 3111 and control lines 3112 of the wiring harness 311 are respectively welded in the multiple power line holes 3043 and control line holes 3044 provided in the PCB circuit board module 304 .

[0049] The PCB circuit board module 304 is fixed in the fixing ring 305 through interference fit with the fixing hole 3051 provided in the fixing ring 305 , and is axially positioned through the positioning surface 3052 provided in the fixing ring 305 .

[0050] A plurality of positioning grooves 3045 are also provided on the PCB circuit board module 304, which cooperate with a plurality of positioning bosses 3053 provided on the fixing ring 305 to prevent the PCB circuit board module 304 from rotating, making its fixation more reliable, and preventing the stator winding 303 wire ends 3031 and the power lines 3111 and control lines 3112 of the wiring harness 311 welded thereon from loosening, thereby causing the motor to malfunction or fail, thereby ensuring the reliability of the motor's operation.

[0051] The wire harness 311 passes through the wire harness opening 3054 provided on the fixing ring 305 and the wire harness opening 30711 provided on the end cover 307 in sequence, and then is led out from the wire outlet sleeve 312 fixed on the wire harness opening 30711 of the end cover 307 .

[0052] The outlet sleeve 312 is installed in the wire harness opening 30711 .

[0053] The PCB circuit board module 304, the fixing ring 305, the outlet sleeve 312, and the end cover 307 form a closed space, which can play a role in waterproofing and dustproofing.

[0054] The outer circular surface 3092 of the machine cover 309 and the inner circular surface 3074 of the end cover 307 are fixed to the end cover 307 by interference fit, and the positioning surface 3091 of the machine cover 309 cooperates with the upper end surface 3072 of the end cover 307 for axial positioning.

[0055] An air gap is formed between 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, and a gap is formed between 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, so that the rotor assembly 2 can rotate smoothly and ensure the normal operation of the motor.

[0056] The distance between 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 is set to L=0.5~1.5mm. During the operation of the motor, the rotor assembly 2 is subjected to a magnetic pulling force axially to the left, so that the ball head surface 2012 set on the motor shaft 201 is close to the end surface 1032 of the gasket 103, preventing the rotor assembly 2 from axial movement, and having the function of reducing vibration and noise.

[0057] The sealing ring I 306 cooperates with the inner circular surface 1012 of the shell 101 to have the function of waterproof and dustproof. After the motor is connected to the mechanism, the sealing ring II 308 cooperates with the inner circular surface of the shell of the external connecting part, and also has the function of waterproof and dustproof. The outlet sleeve 312 cooperates with the wiring harness port 30711 set in the end cover 307, and also has the function of waterproof and dustproof, which effectively prevents foreign matter or liquid from entering the interior of the motor, causing the motor to malfunction or fail, and ensures the reliability of the motor's operation.

[0058] It should be noted that the directional characters such as inside, outside, left, right, up, and down and words containing the directional characters mentioned in this embodiment and this application document that indicate directions are only used for the convenience of explanation. They only refer to specific directions determined during the description and do not constitute a limitation on the content and protection scope of the present invention.

Claims

1. An outer rotor brushless motor for a vehicle, characterized in that: It includes a shell assembly, a rotor assembly and a stator assembly. The shell assembly includes a shell, a motor shaft bearing and an end cover. A bearing chamber is arranged at the closed end of the shell, and the motor shaft bearing is fixed in the bearing chamber. The open end of the shell is fixed to the end cover. The end cover is arranged with a bearing chamber, and the motor shaft bearing is fixed in the bearing chamber arranged in 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, and the rotor shell is fixed on the motor shaft. The two ends of the motor shaft are rollingly supported by the motor shaft bearing in the closed end of the shell and the motor shaft bearing in the end cover respectively. The stator assembly includes a hollow shaft, a stator bearing, a stator laminated component, a PCB circuit board module, and a fixing ring. The hollow shaft is fixed in a hollow shaft fixing hole arranged in the end cover.

2. The outer rotor brushless motor for a vehicle as claimed in claim 1, characterized in that: The fixing ring is fixed in the fixing ring fixing hole provided in the end cover, the PCB circuit board module is fixed on the ring opening of the fixing ring, the end cover is provided with a wire harness opening and a wire outlet sleeve is sleeved on the wire harness opening, and the PCB circuit board module, the fixing ring, the end cover and the wire outlet sleeve form a roughly closed space.

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

4. The outer rotor brushless motor for a vehicle as claimed in claim 1, characterized in that: A sealing ring II is arranged outside the end cover.

5. The outer rotor brushless motor for a vehicle as claimed in claim 1, characterized in that: The length of the hollow shaft fixing hole is sufficiently long.

6. The outer rotor brushless motor for a vehicle as claimed in claim 1, characterized in that: The distance between the axial center of the stator lamination component and the axial center of the rotor permanent magnet of the rotor assembly is L=0.5-1.5mm, a gasket chamber is arranged outside the bearing chamber, the gasket is fixed in the gasket chamber, and the motor shaft is supported on the gasket.

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

8. The outer rotor brushless motor for a vehicle as claimed in claim 6, characterized in that: Flat surfaces are symmetrically arranged on both sides of the gasket, and lubricant is stored in the space formed by the flat surfaces and the gasket chamber.

9. The outer rotor brushless motor for a vehicle as claimed in claim 1, characterized in that: A machine cover is also provided, and the machine cover is fixed on the end cover.

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