Motor output shaft, motor, electric drive system and vehicle
By using a composite material insulation layer at the junction of the motor output shaft and the motor rotor, the problem of electro-corrosion in the electric drive system is solved, the service life is extended, thermal deformation and noise are reduced, and the reliability of the motor output shaft is improved.
Patent Information
- Application Number
- CN202423005509.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-03
AI Technical Summary
In existing electric drive systems, the induced current cannot be isolated when the motor shaft is connected to the motor rotor, resulting in electro-corrosion problems at the bearings and gears. Existing solutions suffer from poor reliability and high cost.
The rotor mating section, designed with a composite material insulation layer, includes a composite material tube and an outer tube to achieve insulation between the motor output shaft and the motor rotor, preventing current from being transmitted to gears and bearings. The rotor mating section, with a multi-layer structure, including a composite material insulation layer, ensures connection rigidity.
It effectively solves the problem of electro-corrosion, extends service life, reduces thermal deformation and operating noise, and improves the reliability and durability of the motor output shaft.
Smart Images
Figure CN223639091U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to motor technical field, concretely relates to a motor output shaft, motor, electric drive system and vehicle. BACKGROUND
[0002] The motor in the electric drive system of the vehicle is to transmit mechanical power to the motor shaft or absorb mechanical power from the motor shaft through the motor rotor, which requires that the connection between the motor rotor and the motor shaft is rigid and reliable. The motor shaft in the existing electric drive system is integrally made of metal material, so that it cannot isolate the induced current from the motor rotor, which will cause the problem of electric corrosion at the bearing and gear of the electric drive system. In order to solve and improve the problem of electric corrosion, the common design is to increase the conductive ring between the motor shaft and the shell, use conductive grease in the bearing, use insulating grease on the inner and outer rings of the bearing, and use ceramic ball insulating bearing. However, the above solutions have the problems of poor reliability and durability and high cost, and can only improve the electric corrosion problem of the bearing and cannot solve the electric corrosion problem of the gear. SUMMARY
[0003] The utility model provides a kind of motor output shaft, motor, electric drive system and vehicle, adopt the rotor cooperation section including composite material insulating layer in the part of motor output shaft and motor rotor cooperation, realize the insulation of the gear cooperation section and bearing cooperation section of motor output shaft and motor rotor, solve the problem of electric corrosion at the bearing and gear of electric drive system.
[0004] In order to solve or improve the above technical problems to some extent, according to the utility model provides a kind of motor output shaft, including: gear cooperation section, rotor cooperation section and bearing cooperation section;
[0005] The gear cooperation section is used to connect the external transmission mechanism to transmit the kinetic energy of the motor to the external transmission mechanism.
[0006] The rotor cooperation section is arranged inside the motor and cooperates with the motor rotor, one end of the rotor cooperation section is connected to the gear cooperation section, the other end of the rotor cooperation section is connected to the bearing cooperation section, the rotor cooperation section is arranged as a multi-layer structure, and at least one layer of the multi-layer structure is a composite material insulating layer.
[0007] In some embodiments, the rotor cooperation section includes a composite material pipe and an outer embedded pipe, the outer embedded pipe is sleeved on the outer periphery of the composite material pipe, the outer embedded pipe cooperates with the rotor of the motor, and the two ends of the composite material pipe are connected to the gear cooperation section and the bearing cooperation section respectively, and the composite material pipe is the composite material insulating layer.
[0008] In some embodiments, the composite tube is connected to the gear matching section and the bearing matching section by spline connection respectively.
[0009] In some embodiments, the rotor matching section further comprises a positioning tube, the composite tube is sleeved on the outer periphery of the positioning tube, and both ends of the positioning tube abut against the gear matching section and the bearing matching section respectively.
[0010] In some embodiments, the positioning tube is the composite insulation layer.
[0011] In some embodiments, the length of the composite tube in the axial direction is greater than the length of the outer embedded tube in the axial direction.
[0012] In some embodiments, an insulation ring is arranged between the rotor end ring of the motor and the gear matching section and the bearing matching section.
[0013] According to another aspect of the present application, a motor is provided, comprising the motor output shaft according to any one of the above embodiments.
[0014] According to another aspect of the present application, an electric drive system is provided, comprising the motor according to any one of the above embodiments.
[0015] According to another aspect of the present application, a vehicle is provided, comprising the electric drive system according to any one of the above embodiments.
[0016] The motor output shaft according to the present application sets the rotor matching section matched with the motor rotor as a multi-layer structure, and the multi-layer structure comprises a composite insulation layer, which can prevent the current on the motor rotor from being transmitted to the gear matching section and the bearing matching section while ensuring the connection rigidity of the rotor matching section and the motor rotor, thereby realizing the insulation between the motor output shaft and the motor rotor, eliminating the electric corrosion of the gear and the bearing, and effectively solving the problem of reduced service life caused by electric corrosion. Meanwhile, the composite insulation layer can effectively reduce the heat transfer during the hot fitting of the motor rotor, reduce the thermal deformation of the motor output shaft, and effectively improve the operating noise caused by the thermal deformation of the motor output shaft.
[0017] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is an embodiment of the cross-sectional structure of the motor output shaft of the present application.
[0019] Figure 2 Structure diagram of the gear cooperation section of an embodiment of the utility model;
[0020] Figure 3 Structure diagram of the outer embedded pipe of the rotor cooperation section of an embodiment of the utility model;
[0021] Figure 4 Structure diagram of the composite pipe of the rotor cooperation section of an embodiment of the utility model;
[0022] Figure 5 Structure diagram of the positioning pipe of the rotor cooperation section of an embodiment of the utility model;
[0023] Figure 6 Structure diagram of the bearing cooperation section of an embodiment of the utility model;
[0024] Figure 7 Structure diagram of the cross section of the motor output shaft and the motor rotor of an embodiment of the utility model;
[0025] Figure 8 Transmission structure diagram of the electric drive system of an embodiment of the utility model.
[0026]
Symbol explanation
[0027] 10, motor output shaft
[0028] 100, gear cooperation section
[0029] 1000, gear tooth
[0030] 110, rotor cooperation section
[0031] 1100, composite pipe
[0032] 1101, outer embedded pipe
[0033] 1102, positioning pipe
[0034] 120, bearing cooperation section
[0035] 20, rotor
[0036] 30, electric drive system
[0037] 300, intermediate shaft
[0038] 301, differential shaft
[0039] 302, primary driving gear
[0040] 303, primary driven gear
[0041] 304, secondary driving gear
[0042] 305. Second-stage driven gear
[0043] 40. Bearings Detailed Implementation
[0044] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation methods and effects of a motor output shaft, motor, electric drive system, and vehicle proposed according to this utility model.
[0045] According to an embodiment of the present invention, a motor output shaft 10 is provided, such as... Figures 1-6 As shown, it includes: gear mating section 100, rotor mating section 110 and bearing mating section 120.
[0046] Among them, such as Figure 1 As shown, the gear mating section 100, rotor mating section 110, and bearing mating section 120 are connected sequentially, that is, one end of the rotor mating section 110 is connected to the gear mating section 100, and the other end of the rotor mating section 110 is connected to the bearing mating section 120. Figure 7 As shown, when the motor output shaft 10 is assembled into the motor, the rotor mating section 110 mates with the motor rotor 20, and the gear mating section 100 and the bearing mating section 120 extend out from both ends of the motor.
[0047] like Figure 1 and Figure 2 As shown, gear teeth 1000 are provided on the gear mating section 100. These gear teeth 1000 mesh with the gears of the external transmission mechanism to realize the transmission of kinetic energy generated by the motor. Bearings 40 are provided on the gear mating section 100 and the bearing mating section 120 to support the motor and ensure that the motor output shaft 10 can rotate.
[0048] During use, if the current on the motor rotor 20 flows into the gear mating section 100 and the bearing mating section 120 of the motor output shaft 10, it will cause electro-corrosion of the gears and bearings connected on the gear mating section 100 and the bearing mating section 120, thereby affecting their service life.
[0049] Based on this, the rotor mating section 110 of the motor output shaft 10 of this utility model is set as a multi-layer structure, and at least one layer of the multi-layer structure is a composite material insulation layer.
[0050] Optionally, the composite material may be made of materials such as PEEK (polyetheretherketone), glass fiber reinforced PEEK (e.g., GF30PEEK), or carbon fiber reinforced PEEK (e.g., CA30PEEK), which possess insulation, low coefficient of thermal expansion, wear resistance, pressure resistance, and high strength. Of course, the above materials are merely examples of composite materials of this invention and are not intended to limit the type of composite material.
[0051] As Figures 1-6 shown, the rotor matching section 110 of the motor output shaft 10 is provided as a multi-layer structure, and at least one layer of the multi-layer structure is a composite insulating material. Compared with the existing motor output shaft 10, the size of the motor output shaft 10 does not need to be additionally increased, and a conductive brush does not need to be used, thereby reducing the space size and weight. Moreover, the thermal conductivity of the composite material is much lower than that of the metal material. When the motor rotor 20 is hot, the heat transmitted to the motor output shaft 10 can be effectively reduced, thereby effectively reducing the thermal deformation of the motor output shaft 10, and thereby reducing the noise generated during the operation of the motor.
[0052] In an embodiment, as Figure 1 , 3 and 4 shown, the multi-layer structure of the rotor matching section 110 includes a composite material pipe 1100 and an outer embedded pipe 1101. The composite material pipe 1100 is made of a composite material and has the characteristics of insulation, low thermal expansion coefficient, wear resistance, pressure resistance, high strength, etc. The outer embedded pipe 1101 is sleeved on the outer periphery of the composite material pipe 1100 and cooperates with the rotor 20 of the motor to transmit the kinetic energy of the rotor 20 of the motor to the motor output shaft 10.
[0053] The rotor matching section 110 of the motor output shaft 10 is connected with the rotor 20 of the motor by interference press fitting. In order to ensure the connection strength and durability of the rotor matching section 110 and the rotor 20 of the motor, the outer embedded pipe 1101 is made of a metal material.
[0054] The rotor matching section 110 is connected with the gear matching section 100 and the bearing matching section 120 through the composite material pipe 1100. Since the composite material pipe 1100 is made of a composite material with insulation performance, the current on the rotor 20 of the motor will not be transmitted to the gear matching section 100 and the bearing matching section 120 through the rotor matching section 110, thereby effectively avoiding the electric corrosion of the bearings and gears provided on the gear matching section 100 and the bearing matching section 120.
[0055] Optionally, the two ends of the composite material pipe 1100 are connected to the gear matching section 100 and the bearing matching section 120 through spline connection, so as to ensure the connection strength between the rotor matching section 110 and the gear matching section 100 and the bearing matching section 120, and ensure that the kinetic energy of the motor can be smoothly output.
[0056] In an embodiment, as Figure 7As shown, the outer sleeve pipe 1101 of the rotor matching section 110 matches with the rotor 20 of the motor, and the outer sleeve pipe 1101 can cover the inner surface of the motor rotor 20. The motor rotor 20 is provided with a rotor end ring at both ends, which is used to connect the parts of the motor bar extending out of the both ends of the core.
[0057] In this embodiment, the length of the composite material pipe 1100 of the rotor matching section 110 in the axial direction is greater than the length of the outer sleeve pipe 1101 in the axial direction, so that after the gear matching section 100 and the bearing matching section 120 are connected by the composite material pipe 1100, a sufficient length of electrical gap is formed between the gear matching section 100 and the bearing matching section 120 and the rotor end ring of the motor, which can effectively prevent the occurrence of gap discharge between the end ring of the motor rotor 20 and the gear matching section 100 and the bearing matching section 120.
[0058] In an embodiment, an insulating ring is arranged between the rotor end ring of the motor and the gear matching section 100 and the bearing matching section 120 to ensure the insulation between the rotor end ring of the motor and the gear matching section 100 and the bearing matching section 120.
[0059] In an embodiment, as shown in Figure 1 and Figure 5 As shown, the multi-layer structure of the rotor matching section 110 of the motor output shaft 10 further includes a positioning pipe 1102, and the composite material pipe 1100 is sleeved on the outer periphery of the positioning pipe 1102, so that the rotor matching section 110 forms a multi-layer structure of the positioning pipe 1102, the composite material pipe 1100 and the outer sleeve pipe 1101 from inside to outside in the radial direction. When the gear matching section 100 and the bearing matching section 120 of the motor output shaft 10 are connected to the rotor matching section 110, the two ends of the positioning pipe 1102 abut against the gear matching section 100 and the bearing matching section 120 respectively, so as to play a role of mutual positioning.
[0060] Optionally, the positioning pipe 1102 is made of a composite material, so as to ensure the rigidity of the positioning pipe 1102 while reducing the weight of the motor output shaft 10.
[0061] Optionally, the positioning pipe 1102 is made of a metal material, so as to ensure the mechanical strength of the positioning pipe 1102 and improve the service life of the motor output shaft 10.
[0062] Another embodiment of the utility model provides a motor, the motor includes stator (not shown in the drawing), rotor 20 and the motor output shaft 10 of any one embodiment above.
[0063] Among them, as shown in Figure 7As shown, the motor output shaft 10 is inserted into the rotor 20 during assembly, with both ends of the output shaft 10 located on the outside of the rotor 20. Specifically, the gear-fitting section 100 and the bearing-fitting section 120 of the motor output shaft 10 are both located on the outside of the rotor 20. Bearings 40 are installed on both the gear-fitting section 100 and the bearing-fitting section 120 to ensure the rotation of the motor output shaft 10 while fixing and supporting the motor. The gear-fitting section 100 also has gear teeth 1000, through which the motor output shaft 10 connects to the gears of an external transmission mechanism, enabling the transmission of the motor's kinetic energy.
[0064] Another embodiment of this utility model provides an electric drive system 30, such as Figure 8 As shown, the electric drive system 30 includes the motor, intermediate shaft 300, differential shaft 301 and multiple transmission gears described in the above embodiments.
[0065] like Figure 8 As shown, the multiple transmission gears include a primary driving gear 302, a primary driven gear 303, a secondary driving gear 304, and a secondary driven gear 305. The primary driving gear 302 meshes with the gear teeth 1000 of the motor output shaft 10. The primary driven gear 303 meshes with the primary driving gear 302. Both the primary driven gear 303 and the secondary driving gear 304 are mounted on an intermediate shaft 300, with bearings 40 at both ends of the intermediate shaft 300. The secondary driven gear 305 meshes with the secondary driving gear 304 and is mounted on a differential shaft 301, with bearings 40 at both ends of the differential shaft 301.
[0066] Another embodiment of the present invention provides a vehicle that includes the electric drive system 30 described in the above embodiment.
[0067] The motor output shaft 10 of this invention features a multi-layered rotor mating section 110 that mates with the motor rotor 20. This multi-layered structure includes a composite material insulation layer. While ensuring the rigidity of the connection between the rotor mating section 110 and the motor rotor 20, this design prevents current from flowing from the motor rotor 20 to the gear mating section 100 and the bearing mating section 120, achieving insulation between the motor output shaft 10 and the motor rotor 20. This eliminates electro-corrosion of the gears and bearings 40, effectively solving the problem of reduced service life caused by electro-corrosion. Simultaneously, the composite material insulation layer effectively reduces heat transfer during the heat transfer of the motor rotor 20, minimizing thermal deformation of the motor output shaft 10 and thus effectively improving the operating noise caused by thermal deformation of the motor output shaft 10.
[0068] The above are only the preferred embodiments of the present application, and are not intended to limit the present application in any form, although the present application has been disclosed as above with the preferred embodiments, however, it is not intended to limit the present application, any person skilled in the art, without departing from the technical scheme of the present application, can make some changes or modifications to the above disclosed technical content for equivalent embodiments of equivalent changes, but as long as it does not deviate from the technical scheme of the present application, according to the technical essence of the present application, any simple modification, equivalent change and modification of the above embodiments are still within the scope of the technical scheme of the present application.
Claims
1. An electric machine output shaft, characterized in that, The motor comprises: a gear matching section, a rotor matching section and a bearing matching section; wherein the gear matching section is used to connect an external transmission mechanism to transmit kinetic energy of the motor to the external transmission mechanism; the rotor matching section is arranged inside the motor and matches the motor rotor, one end of the rotor matching section is connected to the gear matching section, the other end of the rotor matching section is connected to the bearing matching section, the rotor matching section is arranged as a multi-layer structure, and at least one layer of the multi-layer structure is a composite material insulation layer.
2. The motor output shaft of claim 1, wherein The rotor matching section comprises a composite material tube and an outer embedded tube, the outer embedded tube is sleeved on the outer periphery of the composite material tube, the outer embedded tube matches the rotor of the motor, two ends of the composite material tube are respectively connected to the gear matching section and the bearing matching section, and the composite material tube is the composite material insulation layer.
3. The motor output shaft of claim 2, wherein, The composite material tube is connected to the gear matching section and the bearing matching section through a spline respectively.
4. The motor output shaft of claim 2, wherein, The rotor matching section further comprises a positioning tube, the composite material tube is sleeved on the outer periphery of the positioning tube, and two ends of the positioning tube abut against the gear matching section and the bearing matching section respectively.
5. The motor output shaft of claim 4, wherein, The positioning tube is the composite material insulation layer.
6. The motor output shaft of claim 2, wherein, The length of the composite material tube in the axial direction is greater than the length of the outer embedded tube in the axial direction.
7. The motor output shaft of claim 1, wherein An insulation ring is arranged between the rotor end ring of the motor and the gear matching section and the bearing matching section.
8. An electric machine characterized by The motor comprises a stator, a rotor and a motor output shaft according to any one of claims 1-7.
9. An electric drive system characterized by, The motor comprises the motor according to claim 8.
10. A vehicle characterized by comprising: The electric drive system comprises the electric drive system according to claim 9.