WO2020093298A1

WO2020093298A1 - Automotive power transmission system

Info

Publication number: WO2020093298A1
Application number: PCT/CN2018/114480
Authority: WO
Inventors: 林楚辉; 李拥军; 师海风
Original assignee: 广东金霸智能科技股份有限公司
Priority date: 2018-11-08
Filing date: 2018-11-08
Publication date: 2020-05-14
Also published as: CN111788766A

Abstract

An automotive power transmission system, which comprises a power motor (10), the power motor (10) comprises an output shaft (13), and further comprises a magnetic coupling (30) connected to the output shaft (10), the magnetic coupling (30) comprises an outer rotor (32) and an inner rotor (33) mounted inside the outer rotor (32), an air gap (34) is formed between the inner rotor (33) and the outer rotor (32), the inner rotor (33) and the outer rotor (32) are both provided with magnetic sensing components to form a trend of synchronous rotation; the output shaft (13) is connected to the inner rotor (33) or the outer rotor (32), so as to realize external driving through the magnetic coupling (30). The system may not cause noise and vibration, can improve the comfort of occupants of an electric vehicle, and can adjust the speed of the front and rear wheels of the electric vehicle to be consistent, ensuring the comfort of driving the electric vehicle.

Description

Automotive power transmission system

Technical field

[0001] The present invention relates to a power transmission system, and particularly to a power transmission system for electric vehicles.

Background technique

[0002] 5 See the power transmission system of an electric vehicle, which has large noise and vibration. When the speed difference between the front and rear wheels of the electric vehicle cannot be adjusted, the speed difference of the front and rear wheels cannot be adjusted. The driving comfort cannot meet the driving needs.

Summary of the invention

technical problem

[0003] The purpose of the present invention is to overcome the deficiencies of the above technology, to provide an automotive power transmission system, will not produce noise and vibration, and can achieve the electric vehicle front wheel and rear wheel speed adjustment to be consistent, can avoid the occurrence of slip Phenomenon, which can achieve a comfortable driving experience for electric vehicles.

Solution to the problem

Technical solution

[0004] The present invention provides an automotive power transmission system, including a power motor, the power motor includes an output shaft, and further includes a magnetic coupling connected to the output shaft, the magnetic coupling includes an outer rotor and An inner rotor installed in the outer rotor, an air gap is formed between the inner rotor and the outer rotor, and both the inner rotor and the outer rotor are provided with magnetic induction components to form a synchronous rotation tendency; the output shaft is connected to The inner rotor or the outer rotor can be driven externally through the magnetic coupling.

[0005] Further, the inner rotor includes a connecting shaft, an inner rotor core sleeved around the outer periphery of the connecting shaft, and the magnetic induction component disposed on the inner rotor core, the magnetic induction component being a squirrel-cage winding; The outer rotor is mounted to the inner wall of an outer ring, and one end of the connecting shaft is supported by a first bearing mounted in the first end of the outer ring and extends beyond the first end of the outer ring to connect to the corresponding output At one end of the shaft, the other end connecting the shaft is supported by a second bearing installed in the second end of the outer ring.

[0006] Further, the first end and the second end of the outer ring respectively have a first through hole and a second through hole for mounting the first bearing and the second bearing; the first bearing and the second The bearings are all ball bearings. [0007] Further, the second end of the outer ring is formed with a mounting portion at an edge position of the second through hole.

[0008] Further, the inner rotor core includes a body and a plurality of inner rotor teeth formed on the outer periphery of the body, a slot is formed between two adjacent inner rotor teeth, and the squirrel-cage winding is provided on the slot.

[0009] Further, a ring body is sleeved on the outer circumference of the connecting shaft, and the inner rotor core is sleeved on the outer circumference of the ring body.

[0010] Further, the outer rotor includes a magnetic conductive ring and the magnetic induction member disposed on the inner periphery of the magnetic conductive ring, the magnetic conductive ring is mounted to an inner wall of an outer ring, the magnetic induction member is a number of permanent Magnets, the plurality of permanent magnets are arranged at intervals on the inner circumference of the magnetic conductive ring and form the air gap with the inner rotor.

[0011] Further, the magnetic conductive ring is formed by splicing a plurality of magnetic conductive ring units along the circumferential direction, and one permanent magnet is provided on the inner circumference of each magnetic conductive ring unit.

[0012] Further, a groove is formed between two adjacent permanent magnets, the width of the groove gradually decreases in a direction away from the magnetic conductive ring.

[0013] Further, the outer rotor is a permanent magnet rotor, and the inner rotor is a squirrel cage rotor.

[0014] Further, there are two magnetic couplings, and the two magnetic couplings are respectively connected to both ends of the output shaft

[0015] In the implementation of the present invention, in actual application, the power of the power motor can be transmitted to the front wheel or the rear wheel of the electric vehicle by the magnetic coupling, so as to realize the driving of the electric vehicle, and the magnetic coupling has no mechanical contact during the transmission process Therefore, there is no noise and vibration caused by mechanical contact, and no friction is generated, which prolongs the service life of various components and reduces costs. At the same time, it can improve the comfort of electric vehicle occupants; and on the front wheels of electric vehicles When the speed difference of the rear wheels occurs, the speed of the front wheels and the rear wheels can be adjusted to the same through the magnetic coupling, which can avoid the slip phenomenon, thus ensuring the comfort of driving of electric vehicles and meeting the driving needs of people.

Beneficial effects of invention

Brief description of the drawings

BRIEF DESCRIPTION

[0016] FIG. 1 is a schematic structural diagram of an automotive power transmission system according to an embodiment of the present invention;

[0017] FIG. 2 is a schematic cross-sectional view of the automotive power transmission system shown in FIG. 1;

[0018] FIG. 3 is an exploded schematic view of the magnetic coupling of the automotive power transmission system of FIG. 1; [0019] FIG. 4 is a schematic plan view of an outer rotor and an inner rotor of the magnetic coupling shown in FIG. 3;

[0020] FIG. 5 is a schematic cross-sectional view of the outer rotor and the inner rotor shown in FIG. 4.

Invention Example

Embodiments of the invention

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Referring to FIGS. 1 and 2, an automobile power transmission system provided by the present invention is mainly used for electric vehicles. The automotive power transmission system includes a power motor ₁₀ and a magnetic coupling ₃₀ .

[0023] The power motor 10 includes a housing 14, a motor stator 11 installed in the housing 14, and a motor rotor 12 rotatably installed in the motor stator 11. The motor rotor 12 includes an output shaft 13, and both ends of the output shaft 13 are supported by bearings 141 installed in both axial ends of the housing 14 and extend beyond the corresponding axial ends of the housing 14, respectively. The magnetic coupling 30 is connected to the output shaft 13 and is connected to the gear transmission structure 50 through which the front or rear wheels of the electric vehicle are connected.

[0024] In actual application, the power motor 10 outputs power and can be transmitted to the front or rear wheels of the electric vehicle through the magnetic coupling 30 and the gear structure 50 to drive the electric vehicle to operate, thereby realizing the front drive or the rear drive Features. When there is a speed difference between the front and rear wheels of the electric vehicle, the speed difference between the front and rear wheels can also be adjusted through the magnetic coupling 30 to make the front and rear wheels have the same speed, thereby avoiding the front and rear wheels The wheels are slipping, which ensures driving comfort.

[0025] In this embodiment, there are two magnetic couplings 30, and the two magnetic couplings 30 are respectively connected to both ends of the output shaft 13 and are respectively connected to the gear transmission structure 50, and are respectively connected through the gear transmission structure 50 Front and rear wheels of electric cars. In practical applications, the power motor 10 outputs power and can be transmitted to the front and rear wheels of the electric vehicle through the two magnetic couplings 30 and the two gear structures 50 to drive the electric vehicle to operate, thereby achieving the four-wheel drive function .

2 to FIG. 5, the magnetic coupling 30 includes an outer rotor 32 and an inner rotor 33 installed in the outer rotor 32. An air gap 34 is formed between the inner rotor 33 and the outer rotor 32 (see FIGS. 4 and 5). Both the inner rotor 33 and the outer rotor 32 are provided with magnetic induction components to form a synchronous rotation tendency. The magnetic induction components refer to components that can generate a magnetic field and / or can be driven by a magnetic field, such as windings that can generate a fixed or variable magnetic field , Permanent magnets capable of generating a fixed magnetic field, etc. The tendency to form synchronous rotation means that the inner rotor 33 and the outer rotor 32 are finally stabilized at the same rotation speed or the rotation speed difference under the action of the magnetic induction component, even if the inner rotor 33 is in operation The rotational speed of the outer rotor 32 occasionally deviates, but eventually it will stabilize at the same rotational speed or the rotational speed difference. The outer rotor 32 is mounted to the inner wall of an outer ring 31. The output shaft 13 is connected to the inner rotor 33 so that the inner rotor 33 can rotate under the drive of the power motor 10, the rotation of the inner rotor 33 can drive the corresponding outer rotor 32 to rotate synchronously, and the outer ring 31 can rotate synchronously with the corresponding outer rotor 32 . The outer ring 31 is connected to the gear transmission structure 50. Preferably, the outer rotor 32 is a permanent magnet rotor, and the inner rotor 33 is a squirrel cage rotor.

[0027] The inner rotor 33 includes a connecting shaft 331, an inner rotor core 332 sleeved on the outer periphery of the connecting shaft 331, and the magnetic induction member provided on the inner rotor core 332. The magnetic induction component is a squirrel cage winding 333. One end of the connecting shaft 331 is supported by the first bearing 311 installed in the first end of the outer ring 31 and extends beyond the first end of the outer ring 31 and is connected to the corresponding end of the output shaft 13. Preferably, one end of the connecting shaft 331 has an internal spline structure 331a (see FIG. 3), both ends of the output shaft 13 have an external spline structure 101 (see FIG. 2), the internal spline structure 331a and the corresponding external spline The key structure 101 is cooperatively connected, so that the connecting shaft 331 and the output shaft 13 are connected together, and the inner rotor 33 driven by the power motor 10 can be rotated. The other end of the connecting shaft 331 is supported by the second bearing 312 installed in the second end of the outer ring 31. The first bearing 311 and the second bearing 312 provide rotational support to the connecting shaft 331 and the bu ring 31.

[0028] The first end and the second end of the outer ring 31 have a first hole L314 and a second through hole 315 for mounting the first bearing 311 and the second bearing 312, respectively. Both the first bearing 311 and the second bearing 312 are ball bearings. The ball bearing includes an outer ring, an inner ring provided inside the outer ring, and a ball sandwiched between the outer ring and the inner ring. The outer ring of the first bearing 311 is mounted to the inner wall of the first through hole 314, and the inner ring of the first bearing 311 is sleeved to one end of the connecting shaft 331. The outer ring of the second bearing 312 is mounted to the inner wall of the second through hole 315, and the inner ring of the second bearing 312 is sleeved to the other end of the connecting shaft 331.

[0029] The second end of the outer ring 31 is formed at the edge position of the second through hole 315 with a mounting portion 313, the mounting portion 313 is used to connect with the gear transmission structure 50. Preferably, the outer ring 31 and the mounting portion 313 are integrally formed to facilitate manufacturing

[0030] The outer circumference of the connecting shaft 331 is sleeved with a ring body 334, and the inner rotor core 332 is sleeved on the outer circumference of the ring body 334. Preferably, the ring body 334 and the connecting shaft 331 are integrally formed to facilitate manufacturing.

[0031] In this embodiment, the inner rotor core 332 includes a body 332a and a plurality of inner rotor teeth 332b formed on the outer periphery of the body 332a, a tooth groove is formed between two adjacent inner rotor teeth 332b, and the rat Cage winding 333. The number of inner rotor teeth 332b in this embodiment is 23. [0032] The outer rotor 32 includes a magnetic conductive ring 321 and the magnetic induction member provided on the inner periphery of the magnetic conductive ring 321. The magnetic conductive ring 321 is mounted to the inner wall of the outer ring 31, and the magnetic induction components are a plurality of permanent magnets 322, which are spaced apart from the inner circumference of the magnetic conductive ring 321 and are located between the inner rotor teeth 332b of the inner rotor 33 The above-mentioned air gap 34 is formed therebetween. In this embodiment, the number of permanent magnets 322 is 20. A groove 323 is formed between two adjacent permanent magnets 322, and the width of the groove 323 gradually decreases in a direction away from the magnetic conductive ring 321. Preferably, the cross section of the groove 323 is formed in a dovetail shape.

[0033] In this embodiment, the inner circumferential surface of the permanent magnet 322 is an arc surface, and the arc surfaces of the permanent magnets 322 are located on the same circumferential surface, so that the permanent magnets 322 and the inner rotor teeth 332b of the inner rotor 33 The air gap 34 with a uniform thickness is formed.

[0034] The magnetic permeable ring 321 is formed by splicing a plurality of magnetic permeable ring units 324 along the circumferential direction, which is convenient for manufacturing and saves material. Each permanent magnet 322 is provided at the center of the inner circumference of each magnetic permeable ring unit 324.

[0035] In practical application of the present invention, when the inner rotor 33 rotates under the drive of the power motor 10, the squirrel cage winding 333 of the inner rotor 33 cuts the magnetic lines of force of the permanent magnets 322 of the outer rotor 32 to generate an induced current. The winding 333 generates an induced current while generating an induced magnetic field. The induced magnetic field interacts with the permanent magnet magnetic field of the outer rotor 32 under the action of the air gap 34 to generate an electromagnetic torque, which drives the outer rotor 32 to rotate synchronously. The outer ring 31 follows the outer rotor 32 Synchronous rotation, and then through the gear transmission structure 50, the power of the power motor 10 can be transmitted to the front wheels and the rear wheels of the electric vehicle, so that the electric motor 10 can be driven to run by the power motor 10. The outer rotor 32 and the inner rotor 33 of the magnetic coupling 30 have no mechanical contact during the transmission process, but only the magnetic field, so there is no noise and vibration caused by the mechanical contact, and no friction is generated, which prolongs the use of various parts Longevity reduces costs and improves passenger comfort.

[0036] At the same time, the present invention can realize the speed adjustment of the front wheel and the rear wheel of the electric car to be consistent through the magnetic coupling 30, thereby ensuring the driving comfort of the electric car. For example, when the speed of the front wheel decreases, the speed of the outer rotor 32 of the magnetic coupling 30 connected to the front wheel decreases, the rotational speed difference between the outer rotor 32 and the inner rotor 33 of the magnetic coupling 30 becomes larger, and the squirrel cage winding 333 cuts The speed of the magnetic lines of force of the permanent magnets 322 of the outer rotor 32 is accelerated, so that the electromagnetic torque generated between the two is greater, which forces the rotation of the outer rotor 32 and the rotation of the outer ring 31 to accelerate, thereby making the front wheel The rotation speed is increased and the rotation speed is increased, eliminating the difference between the rotation speed of the front wheel and the rear wheel until the rotation speed of the front wheel is the same as the rotation speed of the rear wheel. Similarly, when the speed of the front wheel increases, the speed of the outer rotor 32 of the magnetic coupling 30 connected to the front wheel increases, and the outer rotor 32 and the inner rotation of the magnetic coupling 30 The difference in the rotation speed of the sub 33 becomes larger, and the speed of the magnetic field lines of the squirrel-cage winding 333 cutting the permanent magnets 322 of the outer rotor 32 is accelerated, so that the electromagnetic torque generated between the two (the electromagnetic torque here is the resistance torque) becomes larger This forces the rotation of the outer rotor 32 to slow down and the rotation of the outer ring 31 to slow down, so that the rotation of the front wheel slows down and the rotation speed decreases until the rotation speed of the front wheel is the same as the rotation speed of the rear wheel. The adjustment of the speed of the rear wheels is similar to that of the front wheels, and will not be repeated here.

[0037] In other embodiments, the output shaft 13 may also be connected to the outer rotor 32. The inner rotor 33 is connected to the gear transmission structure 50. The magnetic ring 321 is a cylindrical structure with one end open. The output shaft 13 is connected to the closed end of the magnetic ring 321. In actual application, the outer rotor 32 rotates under the drive of the power motor 10, the squirrel-cage winding 333 of the inner rotor 33 cuts the magnetic lines of force of the permanent magnets 322 of the outer rotor 32 to generate an induced current, and the squirrel-cage winding 3 33 generates an induced current At the same time, an induced magnetic field is generated. The induced magnetic field interacts with the permanent magnet magnetic field of the outer rotor 32 under the action of the air gap 34 to generate electromagnetic torque, thereby driving the inner rotor 33 to rotate synchronously, and thus transmitted to the front wheel of the electric vehicle through the gear transmission structure 50 And / or rear wheels, so that the electric vehicle can be driven to run and the speed of the front and rear wheels of the electric vehicle can be adjusted to be consistent.

[0038] The above examples only express preferred embodiments of the present invention, and their descriptions are more specific and detailed, but they should not be construed as limiting the patent scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, such as combining different features in various embodiments, etc. The protection scope of the present invention.

Claims

[Claim 1] An automobile power transmission system, including a power motor, the power motor including an output shaft, characterized in that it further includes a magnetic coupling connected to the output shaft, the magnetic coupling including an external A rotor and an inner rotor installed in the outer rotor, an air gap is formed between the inner rotor and the outer rotor, and both the inner rotor and the outer rotor are provided with magnetic induction components to form a synchronous rotation tendency; the output shaft It is connected to the inner rotor or the outer rotor to realize external driving through the magnetic coupling.

[Claim 2] The automotive power transmission system according to claim i, wherein the inner rotor includes a connecting shaft, an inner rotor core sleeved around the outer periphery of the connecting shaft, and a rotor shaft disposed on the inner rotor core The magnetic induction component, the magnetic induction component is a squirrel-cage winding; the outer rotor is mounted to an inner wall of an outer ring, and one end of the connecting shaft is supported by a first bearing mounted to the first end of the outer ring and The first end of the protruding outer ring is connected to one end of the corresponding output shaft, and the other end of the connecting shaft is supported by a second bearing installed in the second end of the outer ring.

[Claim 3] The automobile power transmission system according to claim 2, characterized in that: the first end and the second end of the outer ring respectively have a first passage for mounting the first bearing and the second bearing Holes and second through holes; both the first bearing and the second bearing are ball bearings.

[Claim 4] The automobile power transmission system according to claim 3, wherein the second end of the outer ring is formed with a mounting portion at an edge position of the second through hole.

[Claim 5] The automobile power transmission system according to claim 2, wherein: the inner rotor core includes a body and a plurality of inner rotor teeth formed on the outer periphery of the body, formed between two adjacent inner rotor teeth A tooth slot, and the squirrel-cage winding is arranged on the tooth slot.

[Claim 6] The automobile power transmission system according to claim 2, wherein a ring body is provided on the outer circumference of the connecting shaft, and the inner rotor core is sleeved on the outer circumference of the ring body.

[Claim 7] The automobile power transmission system according to claim 1, characterized in that: the outer rotor includes a magnetic conductive ring and the magnetic induction member provided on the inner periphery of the magnetic conductive ring, the magnetic conductive ring is mounted To the inner wall of an outer ring, the magnetic induction component is a plurality of permanent magnets, and the plurality of permanent magnets are spaced apart on the inner circumference of the magnetic conductive ring and form the air gap with the inner rotor.

[Claim 8] The automobile power transmission system according to claim 7, characterized in that: the magnetic conductive ring It is formed by splicing several magnetic ring units along the circumferential direction, and one permanent magnet is provided on the inner periphery of each magnetic ring unit.

[Claim 9] The automobile power transmission system according to claim 7, characterized in that: a groove is formed between two adjacent permanent magnets, and the width of the groove gradually decreases in a direction away from the magnetic ring small.

[Claim 10] The automobile power transmission system according to claim 1, wherein the outer rotor is a permanent magnet rotor, and the inner rotor is a squirrel cage rotor.

[Claim 11] The automobile power transmission system according to claim 1, wherein there are two magnetic couplings, and the two magnetic couplings are respectively connected to both ends of the output shaft.