Coaxial speed reduction electric drive axle

Abstract

The utility model relates to a coaxial deceleration electric drive axle, which belongs to the technical field of electric drive axles and comprises a left half axle, a right half axle and a differential mechanism. A motor body and a magnetic gear reduction structure are arranged on the outer side of the left half shaft; the magnetic gear reduction structure comprises a low-speed rotor structure, a magnetic field modulation structure and a high-speed rotor structure; the magnetic field modulation structure is connected with the outer wall of the motor body; the high-speed rotor structure is connected with the motor body through a motor output shaft; the low-speed rotor structure drives the differential mechanism. The low-speed rotor structure and the high-speed rotor structure realize equal-magnetic-pole coupling under the magnetic field modulation action of the magnetic field modulation structure, so that speed reduction and torque increase are realized; the low-speed rotor structure transmits motion to the left half shaft and the right half shaft through the differential mechanism, and then the motion is transmitted to a wheel edge structure of the electric drive axle to achieve whole axle speed reduction and torque increasing transmission. Motion and power are transmitted through the magnetic field coupling effect, direct contact of a transmission body is avoided in transmission, the rotating speed and direction can be changed at any time, and the advantages of small vibration and noise, no need of lubrication, small impact force and the like are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric drive axles, in particular to a coaxial speed reduction electric drive axle. Background Art

[0002] The electric drive axle is a type of drive axle, but the power unit is adjusted from the original internal combustion engine drive to electric motor drive. At the same time, most electric drive axles integrate the motor into the axle to achieve integration, high efficiency and other functions.

[0003] The electric drive axle is an important core component of new energy vehicles. It is the current trend to integrate the motor and reducer on the electric drive axle at the same time. From the perspective of integrated structure, electric drive axles are divided into two categories: eccentric and coaxial. The traditional coaxial electric drive axle adopts gear transmission. When driven by a high-speed motor, the gear meshes and transmits, which will cause common gear problems such as gear tooth wear and bonding. In addition, because the high-speed motor drives the high-speed gear meshing transmission, it causes heat and power loss, and has strict requirements on lubrication.

[0004] As the core component of the electric drive axle, the reducer assembly should be the focus of attention during the design phase. Because of the shortcomings of pure electric vehicles in terms of endurance and the higher input speed caused by the current trend of high-speed motors, compared with the traditional fuel vehicle transmission (reduction) box, electric vehicles require high efficiency, high torque density, high reliability, high NVH performance, and simple structure for the reducer. In the case of overload, the gears will also have the problem of tooth knocking, which will affect the life of the gears. Compared with the purely mechanical gear-type reduction transmission structure, there are problems such as high vibration and noise, short fatigue life and high repair and maintenance costs. Especially in high-frequency working conditions and precision working environments, the above problems will be more prominent. Utility Model Content

[0005] In order to solve the problem of large noise and large vibration in the traditional reducer structure caused by manufacturing and assembly, the utility model provides a coaxial reduction electric drive axle.

[0006] The utility model is realized by the following technical solutions:

[0007] A coaxial speed reduction electric drive bridge comprises a left half shaft, a right half shaft and a differential connecting the left half shaft and the right half shaft; a motor body and a magnetic gear speed reduction structure are arranged outside the left half shaft, and the magnetic gear speed reduction structure comprises a low-speed rotor structure, a magnetic field modulation structure and a high-speed rotor structure; the magnetic field modulation structure is connected to the outer wall of the motor body; the high-speed rotor structure is rotatably arranged inside the magnetic field modulation structure, and the high-speed rotor structure is connected to the motor body through the motor output shaft; the low-speed rotor structure is rotatably arranged outside the magnetic field modulation structure and drives the differential. Under the magnetic field modulation effect of the magnetic field modulation structure, the low-speed rotor structure and the high-speed rotor structure realize equal magnetic pole coupling and speed reduction and torque increase; the low-speed rotor structure transmits motion to the left half shaft and the right half shaft through the differential, and then transmits it to the wheel side structure of the electric drive bridge to realize the speed reduction and torque increase transmission of the whole bridge; the motion and power are transmitted through the magnetic field coupling effect, there is no direct contact of the transmission body in the transmission, the rotation speed and direction can be changed at any time, and it has the advantages of low vibration and noise, no need for lubrication, overload self-protection, low production process requirements and low impact force.

[0008] Furthermore, the differential includes two half-shaft gears respectively connected to the left half-shaft and the right half-shaft, a cross planetary shaft is provided between the two half-shaft gears, and a planetary gear meshing with the two half-shaft gears is rotatably provided on the cross planetary shaft.

[0009] Furthermore, the left half shaft passes through the motor output shaft.

[0010] Furthermore, the magnetic field modulation structure includes a magnetic conductive block in an overall annular array; the high-speed rotor structure includes a high-speed rotor magnet with N poles and S poles arranged in a spaced-apart manner; and the low-speed rotor structure includes a low-speed rotor magnet with N poles and S poles arranged in a spaced-apart manner.

[0011] Furthermore, the magnetic field modulation structure also includes a magnetic isolation frame, and the magnetic conductive block is embedded in the magnetic isolation frame.

[0012] Furthermore, the magnetic isolation frame is connected to the motor body through a connecting cover; the connecting cover is connected to the magnetic isolation frame and the motor body through screws.

[0013] Furthermore, the high-speed rotor structure also includes a high-speed rotor back iron connected to the motor output shaft, and the high-speed rotor magnet is magnetically adsorbed on the outer ring side of the high-speed rotor back iron.

[0014] Furthermore, the high-speed rotor back iron is connected to the motor output shaft through a spline.

[0015] Furthermore, the low-speed rotor structure also includes a low-speed rotor back iron connected to the differential, and the low-speed rotor magnet is magnetically adsorbed on the inner ring side of the low-speed rotor back iron.

[0016] Furthermore, an air gap is left between the high-speed rotor magnet, the low-speed rotor magnet and the magnetic field modulation structure.

[0017] It can be seen from the above technical scheme that the beneficial effects of the utility model are: the low-speed rotor structure and the high-speed rotor structure realize equal magnetic pole coupling under the magnetic field modulation action of the magnetic field modulation structure, thereby achieving deceleration and torque increase; the low-speed rotor structure transmits the motion to the left half shaft and the right half shaft through the differential, and then transmits it to the wheel side structure of the electric drive bridge to realize the deceleration and torque increase transmission of the entire bridge; the motion and power are transmitted through the magnetic field coupling action, and there is no direct contact of the transmission body in the transmission, and the rotation speed and direction can be changed at any time, with the advantages of low vibration and noise, no need for lubrication, overload self-protection, low production process requirements and low impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a specific implementation method of the utility model.

[0020] Figure 2 It is a schematic diagram of a magnetic gear reduction structure according to a specific implementation mode of the utility model.

[0021] In the accompanying drawings: 1. left half-shaft, 2. motor body, 3. motor output shaft, 4. connecting cover, 5. magnetic gear reduction structure, 51. low-speed rotor structure, 511. low-speed rotor back iron, 512. low-speed rotor magnet, 52. magnetic field modulation structure, 521. magnetic guide block, 522. magnetic isolation frame, 53. high-speed rotor structure, 531. high-speed rotor magnet, 532. high-speed rotor back iron, 6. differential, 61. half-shaft gear, 62. cross planetary shaft, 63. planetary gear, 64. differential case, 7. casing, 8. right half-shaft. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0023] As attached Figure 1-2As shown, a coaxial reduction electric drive axle includes a housing 7 and a left half shaft 1 and a right half shaft 8 arranged in the housing 7 and a differential 6 connecting the left half shaft 1 and the right half shaft 8, wherein the differential 6 is connected to the motor body 2 through a magnetic gear reduction structure.

[0024] The magnetic gear reduction structure 5 includes a low-speed rotor structure 51, a magnetic field modulation structure 52 and a high-speed rotor structure 53; the magnetic field modulation structure 52 is connected to the outer wall of the motor body 2. The magnetic field modulation structure 52 includes a magnetic conductive block 521 in an annular array; the magnetic field modulation structure 52 also includes a magnetic isolation frame 522, and the magnetic conductive block 521 is embedded in the magnetic isolation frame 522. The magnetic isolation frame 522 is connected to the motor body 2 through a connecting cover 4; the connecting cover 4 is respectively connected to the magnetic isolation frame 522 and the motor body 2 by screws. The high-speed rotor structure 53 rotates, and based on the magnetic field modulation structure 52, through the magnetic field modulation coupling effect, it drives the low-speed rotor structure 51 to reduce the rotation according to the low- and high-speed rotor pole logarithm ratio, thereby realizing the reduction speed and torque increase transmission.

[0025] The high-speed rotor structure 53 is rotatably disposed inside the magnetic field modulation structure 52, and the high-speed rotor structure 53 is connected to the motor body 2 through the motor output shaft 3; the low-speed rotor structure 51 is rotatably disposed outside the magnetic field modulation structure 52. The motor output shaft 3 penetrates the motor body 2 and is hollow inside, and the left half shaft 1 penetrates the motor output shaft 3.

[0026] The high-speed rotor structure 53 includes a high-speed rotor magnet 531 with N poles and S poles arranged in an interval and surrounded; the high-speed rotor structure 53 also includes a high-speed rotor back iron 532 connected to the motor output shaft 3, and the high-speed rotor magnet 531 is magnetically attracted to the outer ring side of the high-speed rotor back iron 532. The high-speed rotor back iron 532 is connected to the motor output shaft 3 through a spline.

[0027] The low-speed rotor structure 51 includes a low-speed rotor magnet 512 with N poles and S poles arranged in a spaced manner. The low-speed rotor structure 51 also includes a low-speed rotor back iron 511 connected to the motor output shaft 3, and the low-speed rotor magnet 512 is magnetically attracted to the inner ring side of the low-speed rotor back iron 511.

[0028] An air gap is left between the high-speed rotor magnet 531 , the low-speed rotor magnet 512 and the magnetic conductive block 521 .

[0029] The low-speed rotor structure 51 is connected to the differential 6 and drives the differential 6 .

[0030] The differential 6 includes two side gears 61 connected to the left half shaft 1 and the right half shaft 8 respectively, and a cross planetary shaft 62 connected to the low-speed rotor back iron 511 by bolts is arranged between the two side gears 61, and a planetary gear 63 meshing with the two side gears 61 is rotatably arranged on the cross planetary shaft 62; there are four planetary gears 63, and the four planetary gears 63 are arranged at the ends of the cross planetary shaft 62. The low-speed rotor structure 51 is directly connected to the differential case 64 by bolts, and the motion is transmitted to the differential 6 for rotation, and the cross planetary shaft 62, the planetary gear 63, and the two side gears 61 inside the differential cooperate with each other, so that the side gears 61 rotate, and then the motion is transmitted to the left half shaft 1 and the right half shaft 8 through the internal spline of the spline head, and then transmitted to the electric drive axle wheel side structure.

[0031] The differential 6 further includes a differential case 64 , and the differential case 64 is disposed outside the two side gears 61 .

[0032] The utility model describes a coaxial reduction electric drive bridge, in which the low-speed rotor structure and the high-speed rotor structure realize equal magnetic pole coupling under the magnetic field modulation action of the magnetic field modulation structure, thereby achieving reduction in speed and torque increase; the low-speed rotor structure transmits motion to the left half shaft and the right half shaft through the differential, and then transmits it to the wheel side structure of the electric drive bridge to realize the reduction in speed and torque increase transmission of the entire bridge; motion and power are transmitted through the magnetic field coupling action, and there is no direct contact between the transmission body and the transmission, and the rotation speed and direction can be changed at any time, and has the advantages of low vibration and noise, no need for lubrication, overload self-protection, low production process requirements and low impact force.

[0033] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0034] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. 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 invention. Therefore, the present invention 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 coaxial reduction electric drive axle, characterized in that: The invention comprises a left half shaft (1), a right half shaft (8) and a differential (6) connecting the left half shaft (1) and the right half shaft (8); a motor body (2) and a magnetic gear reduction structure (5) are arranged outside the left half shaft (1); the magnetic gear reduction structure (5) comprises a low-speed rotor structure (51), a magnetic field modulation structure (52) and a high-speed rotor structure (53); the magnetic field modulation structure (52) is connected to the outer wall of the motor body (2); The high-speed rotor structure (53) is rotatably arranged inside the magnetic field modulation structure (52), and the high-speed rotor structure (53) is connected to the motor body (2) via the motor output shaft (3); the low-speed rotor structure (51) is rotatably arranged outside the magnetic field modulation structure (52), and drives the differential (6).

2. The coaxial reduction electric drive axle according to claim 1, characterized in that: The differential (6) comprises two half-shaft gears (61) respectively connected to the left half-shaft (1) and the right half-shaft (8), a cross planetary shaft (62) is arranged between the two half-shaft gears (61), and a planetary gear (63) meshing with the two half-shaft gears (61) is rotatably arranged on the cross planetary shaft (62).

3. A coaxial reduction electric drive axle according to claim 1 or 2, characterized in that: The left half shaft (1) passes through the motor output shaft (3).

4. The coaxial reduction electric drive axle according to claim 3, characterized in that: The magnetic field modulation structure (52) comprises a magnetic conductive block (521) in an annular array; the high-speed rotor structure (53) comprises a high-speed rotor magnet (531) whose N poles and S poles are arranged in a spaced manner; and the low-speed rotor structure (51) comprises a low-speed rotor magnet (512) whose N poles and S poles are arranged in a spaced manner.

5. The coaxial reduction electric drive axle according to claim 4, characterized in that: The magnetic field modulation structure (52) also includes a magnetic isolation frame (522), and the magnetic conductive block (521) is embedded in the magnetic isolation frame (522).

6. The coaxial reduction electric drive axle according to claim 5, characterized in that: The magnetic isolation frame (522) is connected to the motor body (2) via a connecting cover (4); the connecting cover (4) is connected to the magnetic isolation frame (522) and the motor body (2) via screws.

7. The coaxial reduction electric drive axle according to claim 4, characterized in that: The high-speed rotor structure (53) further comprises a high-speed rotor back iron (532) connected to the motor output shaft (3), and the high-speed rotor magnet (531) is magnetically attracted to the outer ring side of the high-speed rotor back iron (532).

8. The coaxial reduction electric drive axle according to claim 7, characterized in that: The high-speed rotor back iron (532) is connected to the motor output shaft (3) via a spline.

9. The coaxial reduction electric drive axle according to claim 7, characterized in that: The low-speed rotor structure (51) further comprises a low-speed rotor back iron (511) connected to the differential (6), and the low-speed rotor magnet (512) is magnetically attracted to the inner ring side of the low-speed rotor back iron (511).

10. The coaxial reduction electric drive axle according to claim 9, characterized in that: An air gap is left between the high-speed rotor magnet (531) and the low-speed rotor magnet (512) and the magnetic field modulation structure (52).

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