Automobile power transmission system

Abstract

The present invention relates to an automobile power transmission system, comprising a power motor (10), wherein the power motor (10) comprises an output shaft (13), and further comprises a magnetic coupling (30) connected to the output shaft (10), wherein the magnetic coupling (30) comprises an outer rotor (32) and an inner rotor (33) installed in the outer rotor (32), wherein an air gap (34) is formed between the inner rotor (33) and the outer rotor (32), and both the inner rotor (33) and the outer rotor (32) are provided with magnetic induction components to form a tendency of synchronous rotation; the output shaft (13) is connected to the inner rotor (33) or the outer rotor (32) to realize external drive through the magnetic coupling (30). It does not generate noise and vibration, thereby improving the riding comfort of electric vehicle passengers, and can adjust the speed of the front wheel and the rear wheel of the electric vehicle to be consistent, thereby ensuring the driving comfort of the electric vehicle.

Description

Technical Field

[0001] The invention relates to a power transmission system, in particular to a power transmission system for an electric vehicle. Background Art

[0002] The power transmission system of existing electric vehicles has large noise and vibration. 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 cannot be adjusted, resulting in inconsistent speeds of the front and rear wheels, which is prone to slippage, affecting driving comfort and failing to meet driving needs. SUMMARY OF THE INVENTION

[0004] Technical issues

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned technology and provide an automobile power transmission system that does not generate noise and vibration, and can adjust the speed of the front and rear wheels of an electric vehicle to be consistent, thereby avoiding slipping and achieving a comfortable driving experience of the electric vehicle.

[0006] Solution to the problem

[0007] Technical Solutions

[0008] The present invention provides an automobile power transmission system, including a power motor, the power motor including an output shaft, and also including a magnetic coupling connected to the output shaft, the magnetic coupling including 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 the inner rotor and the outer rotor are both provided with magnetic induction components to form a tendency of synchronous rotation; the output shaft is connected to the inner rotor or the outer rotor to achieve external drive through the magnetic coupling.

[0009] Furthermore, the inner rotor includes a connecting shaft, an inner rotor core sleeved on the outer circumference of the connecting shaft, and the magnetic induction component arranged on the inner rotor core, and the magnetic induction component is a squirrel cage winding; the outer rotor is installed on the inner wall of an outer ring, one end of the connecting shaft is installed on the first end of the outer ring to support the first bearing and extends out of the first end of the outer ring to be connected to one end of the corresponding output shaft, and the other end of the connecting shaft is installed on the second end of the outer ring to support the second bearing.

[0010] Furthermore, the first end and the second end of the outer ring respectively have a first through hole and a second through hole for installing the first bearing and the second bearing; the first bearing and the second bearing are both ball bearings.

[0011] Furthermore, a mounting portion is formed at the second end of the outer ring at an edge of the second through hole.

[0012] Furthermore, the inner rotor core includes a body and a plurality of inner rotor teeth formed on the outer periphery of the body, a tooth slot is formed between two adjacent inner rotor teeth, and the squirrel cage winding is arranged on the tooth slot.

[0013] Furthermore, a ring body is sleeved on the outer periphery of the connecting shaft, and the inner rotor core is sleeved on the outer periphery of the ring body.

[0014] Furthermore, the outer rotor includes a magnetic ring and the magnetic induction component arranged on the inner circumference of the magnetic ring, the magnetic ring is installed on the inner wall of an outer ring, the magnetic induction component is a plurality of permanent magnets, and the plurality of permanent magnets are arranged at intervals on the inner circumference of the magnetic ring to form the air gap with the inner rotor.

[0015] Furthermore, the magnetic conductive ring is formed by splicing a plurality of magnetic conductive ring units along the circumferential direction, and a permanent magnet is arranged on the inner circumference of each magnetic conductive ring unit.

[0016] Furthermore, a groove is formed between two adjacent permanent magnets, and the width of the groove gradually decreases in a direction away from the magnetic conductive ring.

[0017] Furthermore, the outer rotor is a permanent magnet rotor, and the inner rotor is a squirrel cage rotor.

[0018] Furthermore, there are two magnetic couplings, which are respectively connected to two ends of the output shaft.

[0019] When the present invention is implemented and applied in practice, 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 drive the electric vehicle to run. The magnetic coupling has no mechanical contact during the transmission process, so there is no noise and vibration generated by mechanical contact, and no friction is generated, which prolongs the service life of various components, reduces costs, and improves the riding comfort of the electric vehicle passengers. When there is a speed difference between the front and rear wheels of the electric vehicle, the speeds of the front and rear wheels can be adjusted to be consistent through the magnetic coupling, so as to avoid slipping, thereby ensuring the driving comfort of the electric vehicle and meeting people's driving needs.

[0020] Advantageous Effects of the Invention

[0021] Brief description of the accompanying drawings BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of an automobile power transmission system provided by an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A schematic cross-sectional view of a power transmission system of an automobile shown;

[0024] Figure 3 yes Figure 1 An exploded schematic diagram of a magnetic coupling of the automotive power transmission system;

[0025] Figure 4 yes Figure 3 A schematic plan view of an outer rotor and an inner rotor of the magnetic coupling shown;

[0026] Figure 5 yes Figure 4 A schematic cross-sectional view of the outer rotor and the inner rotor is shown.

[0027] Embodiments of the invention

[0028] Embodiments of the present invention

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] refer to Figure 1 and Figure 2 The present invention provides an automobile power transmission system, which is mainly used in electric vehicles. The automobile power transmission system includes a power motor 10 and a magnetic coupling 30.

[0031] 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 the two axial ends of the housing 14 and extend out of the corresponding axial ends of the housing 14. The magnetic coupling 30 is connected to the output shaft 13 and connected to the gear transmission structure 50, which is used to connect the front wheel or the rear wheel of the electric vehicle through the gear transmission structure 50.

[0032] In actual application, the power motor 10 outputs power and can be transmitted to the front wheels or rear wheels of the electric vehicle through the magnetic coupling 30 and the gear structure 50 to drive the electric vehicle to run, thereby realizing the front-wheel drive or rear-wheel drive function. When there is a speed difference between the front wheels and the rear wheels of the electric vehicle, the speed difference between the front wheels and the rear wheels can also be adjusted through the magnetic coupling 30 to make the speed of the front wheels and the rear wheels consistent, thereby avoiding the front wheels and the rear wheels from slipping, thereby ensuring driving comfort.

[0033] In this embodiment, there are two magnetic couplings 30, which are respectively connected to the two ends of the output shaft 13 and respectively connected to the gear transmission structure 50, and are respectively used to connect the front wheel and the rear wheel of the electric vehicle through the gear transmission structure 50. In actual application, the power motor 10 outputs power and can be transmitted to the front wheel and the rear wheel of the electric vehicle through the two magnetic couplings 30 and the two gear structures 50 to drive the electric vehicle to run, thereby realizing the four-wheel drive function.

[0034] refer to Figures 2 to 5The 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 Figure 4 and Figure 5 ). The inner rotor 33 and the outer rotor 32 are both provided with magnetic induction components to form a tendency of synchronous rotation, and the magnetic induction components refer to components that can generate a magnetic field and / or can be driven by a magnetic field, such as a winding that can generate a fixed or variable magnetic field, a permanent magnet that can generate a fixed magnetic field, etc. The tendency of synchronous rotation means that the inner rotor 33 and the outer rotor 32 are finally stabilized at the same speed or speed difference under the action of the magnetic induction components. Even if the speeds of the inner rotor 33 and the outer rotor 32 occasionally deviate during operation, they will eventually stabilize at the same speed or speed difference. The outer rotor 32 is mounted on 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, and 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.

[0035] 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 component arranged 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 a first bearing 311 installed in the first end of the outer ring 31 and extends out of the first end of the outer ring 31 to be connected to one end of the corresponding output shaft 13. Preferably, one end of the connecting shaft 331 has an inner spline structure 331a (see Figure 3 ), both ends of the output shaft 13 have external spline structures 101 (see Figure 2 ), the inner spline structure 331a is matched and connected with the corresponding outer spline structure 101, so as to connect the connecting shaft 331 and the output shaft 13 together, and the inner rotor 33 can be driven to rotate by the power motor 10. 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 rotation support for the connecting shaft 331 and the outer ring 31.

[0036] The first end and the second end of the outer ring 31 respectively have a first through hole 314 and a second through hole 315 for mounting the first bearing 311 and the second bearing 312. The first bearing 311 and the second bearing 312 are both ball bearings. The ball bearing includes an outer ring, an inner ring arranged inside the outer ring, and a ball clamped 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.

[0037] The second end of the outer ring 31 is formed with a mounting portion 313 at the edge of the second through hole 315, and 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.

[0038] 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.

[0039] 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 slot is formed between two adjacent inner rotor teeth 332b, and the above-mentioned squirrel cage winding 333 is arranged on the tooth slot. The number of the inner rotor teeth 332b in this embodiment is 23.

[0040] The outer rotor 32 includes a magnetic ring 321 and the magnetic induction component arranged on the inner circumference of the magnetic ring 321. The magnetic ring 321 is installed on the inner wall of the outer ring 31, and the magnetic induction component is a plurality of permanent magnets 322, which are arranged at intervals on the inner circumference of the magnetic ring 321 and form the above-mentioned air gap 34 with the plurality of inner rotor teeth 332b of the inner rotor 33. 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 the direction away from the magnetic ring 321. Preferably, the cross-section of the groove 323 is formed in a dovetail shape.

[0041] In this embodiment, the inner circumference 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 an air gap 34 with uniform thickness is formed between the permanent magnets 322 and the inner rotor teeth 332 b of the inner rotor 33 .

[0042] The magnetic conductive ring 321 is formed by splicing a plurality of magnetic conductive ring units 324 along the circumferential direction, which is easy to manufacture and saves materials. One permanent magnet 322 is arranged at the inner center of each magnetic conductive ring unit 324 .

[0043] 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 squirrel cage winding 333 generates an induced magnetic field while generating an induced current. 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, thereby driving the outer rotor 32 to rotate synchronously, and the outer ring 31 rotates synchronously with the outer rotor 32. Then, through the gear transmission structure 50, the power of the power motor 10 can be transmitted to the front and rear wheels of the electric vehicle, thereby realizing the driving of the electric vehicle 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, only the magnetic field, so there is no noise and vibration generated by the mechanical contact, and no friction is generated, which prolongs the service life of each component, reduces the cost, and improves the riding comfort of the passengers.

[0044] At the same time, the present invention can adjust the speed of the front and rear wheels of the electric vehicle to be consistent through the magnetic coupling 30, thereby ensuring the driving comfort of the electric vehicle. 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 speed difference between the outer rotor 32 and the inner rotor 33 of the magnetic coupling 30 becomes larger, and the speed of the squirrel cage winding 333 cutting the magnetic lines of force of the permanent magnets 322 of the outer rotor 32 increases, so that the electromagnetic torque generated between the two is large, which forces the outer rotor 32 to rotate faster and the outer ring 31 to rotate faster, thereby accelerating the rotation of the front wheel and increasing the speed, eliminating the speed difference between the front and rear wheels, until the speed of the front wheel is the same as the 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, the speed difference between the outer rotor 32 and the inner rotor 33 of the magnetic coupling 30 increases, and the speed of the squirrel cage winding 333 cutting the magnetic lines of force of the permanent magnets 322 of the outer rotor 32 increases, so that the electromagnetic torque (the electromagnetic torque here is the resistance torque) generated between the two is large, which forces the outer rotor 32 to rotate slower and the outer ring 31 to rotate slower, thereby slowing down the rotation of the front wheel and reducing the speed until the speed of the front wheel is the same as that of the rear wheel. The speed adjustment of the rear wheel is similar to that of the front wheel, and will not be repeated here.

[0045] 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, and 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 squirrel cage winding 333 generates an induced magnetic field while generating an induced current. 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, thereby driving the inner rotor 33 to rotate synchronously, and then transmitting to the front and / or rear wheels of the electric vehicle through the gear transmission structure 50, so as to also achieve the function of driving the electric vehicle to run and adjusting the speed of the front and rear wheels of the electric vehicle to be consistent.

[0046] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, such as combining different features in various embodiments, etc., which all belong to the protection scope of the present invention.

Claims

1. An automobile power transmission system, comprising a power motor, wherein the power motor comprises an output shaft and is characterized in that: It also 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, the outer rotor is a permanent magnet rotor, the inner rotor is a squirrel cage rotor, an air gap is formed between the inner rotor and the outer rotor, the inner rotor and the outer rotor are both provided with magnetic induction components to form a tendency of synchronous rotation, the output shaft is connected to the inner rotor or the outer rotor to achieve external drive through the magnetic coupling, The inner rotor comprises a connecting shaft, an inner rotor core sleeved on the outer circumference of the connecting shaft, and the magnetic induction component arranged on the inner rotor core, wherein the magnetic induction component is a squirrel cage winding, the outer rotor is mounted on the inner wall of an outer ring, one end of the connecting shaft is mounted on a first bearing support in the first end of the outer ring and extends out of the first end of the outer ring to be connected to one end of the corresponding output shaft, and the other end of the connecting shaft is mounted on a second bearing support in the second end of the outer ring, the inner rotor core comprises a body and a plurality of inner rotor teeth formed on the outer circumference of the body, a tooth slot is formed between two adjacent inner rotor teeth, and the squirrel cage winding is arranged on the tooth slot, The outer rotor includes a magnetic ring and the magnetic induction component arranged on the inner circumference of the magnetic ring. The magnetic ring is installed on the inner wall of an outer ring. The magnetic induction component is a plurality of permanent magnets. The plurality of permanent magnets are arranged at intervals on the inner circumference of the magnetic ring and form the air gap with the inner rotor. The magnetic ring is composed of a plurality of magnetic ring units spliced ​​together along the circumferential direction, and a permanent magnet is arranged on the inner circumference of each magnetic ring unit.

2. The automotive power transmission system according to claim 1, characterized in that: 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, and the first bearing and the second bearing are both ball bearings.

3. The automotive power transmission system according to claim 2, characterized in that: The second end of the outer ring is formed with a mounting portion at an edge of the second through hole.

4. The automotive power transmission system according to claim 1, characterized in that: A ring body is sleeved on the outer periphery of the connecting shaft, and the inner rotor core is sleeved on the outer periphery of the ring body.

5. The automotive power transmission system according to claim 1, 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 conductive ring.

6. The automotive power transmission system according to claim 1, characterized in that: There are two magnetic couplings, and the two magnetic couplings are respectively connected to two ends of the output shaft.

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