Motor rotating shaft of electric automobile

Abstract

The utility model relates to an electric vehicle motor rotating shaft which comprises a rotating shaft body, an oil storage bin is arranged in the rotating shaft body, a rotor connecting shaft is arranged on one side of a first flange, and a first connecting shaft fixedly provided with a bearing is arranged on the side, away from the first flange, of the rotor connecting shaft; an extension shaft is arranged on the other side of the first flange, a second connecting shaft fixedly provided with a bearing is arranged on the side, away from the first flange, of the extension shaft, a plurality of oil storage grooves are evenly distributed in the circumference of the side, close to the first flange, of the circumferential surface of the rotor connecting shaft, and first oil outlet holes are formed in the oil storage grooves and communicated with an oil way of the oil storage bin; a plurality of second oil outlet holes are evenly distributed in the circumference of the side, close to the first connecting shaft, of the circumferential surface of the rotor connecting shaft, and the second oil outlet holes communicate with the oil storage bin through the oil way.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular to a motor shaft of an electric vehicle. Background Art

[0002] The power limit of a motor is often limited by its temperature rise limit, so improving the cooling and heat dissipation capacity of the motor can immediately increase the power density.

[0003] Currently, permanent magnet motors account for more than 90% of the installed capacity of electric vehicles, but the performance of permanent magnet motors decays as the temperature rises. Therefore, in order to prevent the reversible and irreversible demagnetization of permanent magnets, a low-temperature rotor environment is always expected. Low operating temperature is the best strategy to extend the life of permanent magnets and insulation materials. This important task cannot be shirked by thermal management technology.

[0004] Optimized thermal management design can significantly increase the rated power of the motor and increase its operating time at peak power levels with almost no increase in manufacturing costs. Therefore, optimized thermal management design can achieve a more optimal balance between motor performance, efficiency, cost and motor size.

[0005] Water cooling technology is currently the mainstream heat dissipation method, but it cannot directly cool the heat source. The heat at the winding needs to pass through the insulation layer in the slot and the motor stator before it can be transferred to the outer casing and carried away by water. The transfer path is long, the heat dissipation efficiency is low, and the fitting tolerance between the components further affects the thermal resistance of the transfer path.

[0006] With respect to the above-mentioned related technologies, the inventor believes that the disadvantage of low efficiency in heat dissipation and cooling of the motor is addressed. Utility Model Content

[0007] In order to improve the defect of low heat dissipation and cooling efficiency of electric vehicle motors, the present application provides an electric vehicle motor shaft.

[0008] The electric vehicle motor shaft provided in this application adopts the following technical solution:

[0009] An electric vehicle motor shaft comprises an electric vehicle motor shaft, comprising a shaft body, wherein an oil storage tank is arranged in the shaft body;

[0010] The rotating shaft body comprises a first flange, a rotor connecting shaft is arranged on one side of the first flange, and a first connecting shaft fixed with a bearing is arranged on a side of the rotor connecting shaft away from the first flange;

[0011] An extension shaft is provided on the other side of the first flange, a second connecting shaft with a bearing fixed thereon is provided on the side of the extension shaft away from the first flange 5, a second flange is provided on one end of the second connecting shaft away from the first flange, and a fourth inner groove is provided at the connecting end of the second flange and the second connecting shaft;

[0012] A third connecting shaft is arranged at one end of the second flange away from the first flange, and a second buffer shaft is arranged at one end of the third connecting shaft away from the second flange;

[0013] A plurality of oil storage grooves are evenly distributed on one side of the circumference of the circumferential surface of the rotor connecting shaft close to the first flange, and a first oil outlet hole is provided in the oil storage groove, and the first oil outlet hole is connected to the oil passage of the oil storage tank;

[0014] A plurality of second oil outlet holes are evenly distributed on the circumference of one side of the circumferential surface of the rotor connecting shaft close to the first connecting shaft, and the second oil outlet holes are communicated with the oil passage of the oil storage tank.

[0015] By adopting the above technical solution, an oil storage tank is provided in the shaft body. Through the design of the oil storage tank and the oil outlet hole, the cooling oil can be stored and released when the shaft moves, and enter the punching sheets of the rotor. The cooling oil takes away the heat energy of the rotor punching sheets, reducing the heat and temperature of the rotor. By arranging a number of oil storage tanks and oil outlet holes on the rotor connecting shaft, the storage and release efficiency of the cooling oil is improved, thereby maintaining the efficient operation of the motor.

[0016] Optionally, the bottom of the first oil outlet hole is communicated with the first oil hole, and the bottom of the first oil hole penetrating the circumferential wall of the rotor connecting shaft is communicated with the oil passage of the oil storage tank.

[0017] By adopting the above technical scheme, by connecting the first oil outlet hole with the first oil hole, and connecting the bottom of the first oil hole that passes through the circumferential wall of the rotor connecting shaft with the oil path of the oil storage tank, it is ensured that the cooling oil can flow smoothly, the oil path is guaranteed to be unobstructed, and the heat dissipation effect of the motor is improved. Through the circulation of the cooling oil, it helps to dissipate heat during the operation of the motor, effectively control the temperature of the motor, improve the working stability and reliability, and more flexibly regulate the flow direction and flow rate of the cooling oil to adapt to the heat dissipation requirements under different working conditions, improve the adaptability and performance of the motor, and improve the reliability, efficiency and thermal management capabilities of the electric vehicle motor.

[0018] Optionally, the bottom of the second oil outlet hole is communicated with the second oil hole, and the bottom of the second oil hole penetrating the circumferential wall of the rotor connecting shaft is communicated with the oil passage of the oil storage tank.

[0019] By adopting the above technical solution, double cooling of the rotating shaft is achieved through the connection between the second oil outlet hole and the second oil hole, which helps to improve the heat dissipation efficiency of the rotor when the motor is running and the heat dissipation efficiency of the rotor to the stator punching sheets. The heat dissipation oil flows along the two channels, improving the smoothness of the oil circuit, better and more effectively dissipating the heat of the key parts of the motor, and maintaining the motor working within an appropriate temperature range.

[0020] Optionally, the oil storage bin is located in a blind hole in the rotating shaft body, the opening of the oil storage bin is located at one end of the second buffer shaft, and the bottom of the hole of the oil storage bin is located at an end of the first connecting shaft.

[0021] By adopting the above technical solution, the oil storage tank is placed in the blind hole in the shaft body, which helps to achieve a compact structural design, minimize the volume of the entire motor, and improve the integration of the motor. The orifice of the oil storage tank is located at one end of the second buffer shaft, and the bottom of the hole is located at the end of the first connecting shaft, which can achieve effective cooling oil supply and ensure that the cooling oil flows smoothly into the shaft and rotor punchings, thereby improving the heat dissipation efficiency and operation efficiency of the motor.

[0022] Optionally, a plurality of long grooves are evenly distributed on the circumferential surface of the rotor connecting shaft, and the length of the long grooves runs through the length of the rotor connecting shaft.

[0023] By adopting the above technical solution, the long grooves help to store cooling oil in the grooves during operation, thereby improving the cooling effect; the presence of the long grooves helps to form a cooling oil film, which not only improves the cooling effect, but also dissipates heat through the movement of the cooling oil, thereby helping to control the temperature of the motor.

[0024] Optionally, the shaft body is provided with a first inner groove, a second inner groove, a third inner groove, a fourth inner groove, a fifth inner groove, and a sixth inner groove.

[0025] By adopting the above technical solution, the presence of the groove allows the cooling oil to be stored, which helps to maintain an appropriate amount of cooling oil during operation and improve the cooling effect of the motor. The formation of the groove increases the surface area of ​​the cooling oil, which helps to better dissipate heat and enables the cooling oil to flow effectively to the required position, helping to control the motor temperature, improve the thermal management performance of the motor, and comprehensively improve the performance of the electric vehicle motor.

[0026] Optionally, the first inner groove is provided at a connection position between the first connecting shaft and the rotor connecting shaft;

[0027] The second inner groove is provided at the connection position between the first flange and the extension shaft;

[0028] The third inner groove is provided at the connection position between the extension shaft and the second connection shaft;

[0029] The fourth inner groove is provided at the connection position of the second connecting shaft and the second flange;

[0030] The fifth inner groove is provided at the connection position between the second flange and the third connection shaft;

[0031] The sixth inner groove is arranged at the connection position between the third connecting shaft and the second buffer shaft.

[0032] By adopting the above technical solution, by setting corresponding inner grooves at different connection positions, each inner groove is located at a key connection position, which helps to enhance the heat dissipation effect, helps control the temperature of the motor, and utilizes the axial installation in place when the motor is assembled to reduce the vibration of the connection position and improve the smoothness and stability of the motor.

[0033] Optionally, the shaft body includes a rotor connecting shaft, a first connecting shaft, an oil storage tank, a first flange, an inner shaft, a spacer, an oil injection hole and an oil overflow hole;

[0034] An oil storage tank is provided inside the rotor connecting shaft, and a heat exchange area is provided inside the rotor connecting shaft;

[0035] An inner shaft is provided at one end of the first flange away from the extension shaft and fixedly connected thereto, the inner shaft extends into the heat exchange area in the rotor connecting shaft, and the inner shaft is connected to the oil path in the heat exchange area.

[0036] An oil storage tank is provided in the middle of the inner shaft;

[0037] A plurality of spacers are sleeved on the outer circumference of the inner shaft, and the spacers are evenly distributed axially along the outer circumference of the inner shaft, and the outer circumference of the spacers is fixedly connected to the hole wall of the heat exchange area in the rotor connecting shaft;

[0038] The spacer divides the heat exchange area into a plurality of separate heat exchange areas. The spacer is provided with a plurality of oil holes penetrating along the axial direction. The oil holes connect the oil paths of the separate heat exchange areas.

[0039] The circumferential wall of the rotor connecting shaft is provided with a plurality of oil spray holes penetrating radially inside and outside, and the oil spray holes connect the heat exchange area with the external oil circuit;

[0040] The first connecting shaft is provided with an oil overflow hole, and the oil overflow hole connects the heat exchange area with the external oil circuit, and the diameter of the oil overflow hole is smaller than the diameter of the heat exchange area.

[0041] By adopting the above technical scheme, a heat exchange area is provided in the rotating shaft body, and the inner shaft realizes efficient heat exchange by connecting the inner and outer radially penetrating oil storage tanks and oil injection holes, and the heat exchange area separated by the spacer blocks, which is helpful to effectively control the temperature of the motor; the inner shaft realizes complex oil circuit communication by connecting the oil storage tank and the heat exchange area, and setting the oil holes of the spacer blocks, which is helpful for the circulation and cooling of the oil in the rotating shaft body; an oil storage tank is provided in the rotor connecting shaft, and an oil storage tank is provided through the middle of the inner shaft. Through the design of the oil storage tank and the inner shaft, effective cooling oil storage and supply are realized, which is helpful to improve the cooling effect of the motor; through the design of the inner shaft, the flow direction of the cooling oil can be controlled. and flow rate, improving the use efficiency of cooling oil to meet the needs of different working conditions; the spacer divides the heat exchange area into several separate areas, and the setting of oil holes facilitates the exchange and circulation of oil between different areas, thereby improving the heat exchange efficiency; the setting of oil injection holes and oil overflow holes enables the heat exchange area to be connected with the external oil circuit to achieve heat dissipation and oil circulation, thereby improving the heat dissipation performance of the motor, achieving a more efficient cooling system, improving the thermal management capability of the motor, ensuring the stable operation of the motor under high load conditions, effectively improving the thermal management performance, cooling effect and reliability of the motor, and providing good technical support for the long-term operation of the electric vehicle motor.

[0042] In summary, the present application includes at least one of the following beneficial technical effects:

[0043] 1. An oil storage tank is provided in the shaft body. Through the design of the oil storage tank and the oil outlet hole, the cooling oil can be stored and released when the shaft moves, and enter the rotor punching. The cooling oil takes away the heat energy of the rotor punching, reducing the heat and temperature of the rotor. By arranging a number of oil storage tanks and oil outlet holes on the rotor connecting shaft, the storage and release efficiency of the cooling oil is improved, thereby maintaining the efficient operation of the motor;

[0044] 2. The first oil outlet is connected to the first oil hole, and the bottom of the first oil hole penetrating the circumferential wall of the rotor connecting shaft is connected to the oil path of the oil storage tank, so as to ensure that the cooling oil can flow smoothly, ensure that the oil path is unobstructed, improve the heat dissipation effect of the motor, and help dissipate heat during the operation of the motor through the circulation of the cooling oil, effectively control the temperature of the motor, improve the working stability and reliability, and more flexibly regulate the flow direction and flow of the cooling oil to meet the heat dissipation requirements under different working conditions, improve the adaptability and performance of the motor, and improve the reliability, efficiency and thermal management capabilities of the electric vehicle motor;

[0045] 3. Through the connection between the second oil outlet hole and the second oil hole, dual cooling of the rotating shaft is achieved, which helps to improve the heat dissipation efficiency of the rotor when the motor is running and the heat dissipation efficiency of the rotor to the stator punching sheet. The heat dissipation oil flows along the two channels, improving the smoothness of the oil circuit, better dissipating the heat of the key parts of the motor, and maintaining the motor working within a suitable temperature range;

[0046] 4. The long groove helps to store cooling oil in the groove during operation, improving the cooling effect; the presence of the long groove helps to form a cooling oil film, which not only improves the cooling effect, but also dissipates heat through the movement of the cooling oil, helping to control the temperature of the motor;

[0047] 5. A heat exchange area is provided in the shaft body. The inner shaft realizes efficient heat exchange by connecting the inner and outer radially penetrating oil storage bins and oil injection holes, and the heat exchange area separated by spacers, which helps to effectively control the temperature of the motor; the inner shaft realizes complex oil circuit communication by connecting the oil storage bin and the heat exchange area, and setting the oil holes of the spacers, which helps the circulation and cooling of the oil in the shaft body; an oil storage bin is provided in the rotor connecting shaft, and an oil storage bin is provided through the middle of the inner shaft. Through the design of the oil storage bin and the inner shaft, effective cooling oil storage and supply are realized, which helps to improve the cooling effect of the motor; through the design of the inner shaft, the flow direction and flow rate of the cooling oil can be controlled to improve High cooling oil utilization efficiency to meet the needs of different working conditions; the spacer divides the heat exchange area into several separate areas, and the setting of oil holes facilitates the exchange and circulation of oil between different areas, thereby improving the heat exchange efficiency; the setting of the oil injection hole and the oil overflow hole enables the heat exchange area to be connected with the external oil circuit to achieve heat dissipation and oil circulation, thereby improving the heat dissipation performance of the motor, achieving a more efficient cooling system, improving the thermal management capability of the motor, ensuring the stable operation of the motor under high load conditions, effectively improving the thermal management performance, cooling effect and reliability of the motor, and providing good technical support for the long-term operation of the electric vehicle motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the structure of the electric vehicle motor shaft of Example 1 of the present application.

[0049] Figure 2 The electric vehicle motor shaft of the embodiment 1 of the present application Figure 1 Schematic diagram of .

[0050] Figure 3 yes Figure 1 A-direction cross-sectional view.

[0051] Figure 4 yes Figure 1 B-direction cross-sectional view.

[0052] Figure 5 yes Figure 1 C-section view.

[0053] Figure 6 It is a schematic diagram of the structure of the electric vehicle shaft of Example 2 of the present application.

[0054] Explanation of the reference numerals: 1. rotating shaft body; 101. oil storage tank; 102. first oil hole; 103. second oil hole; 104. first inner groove; 105. second inner groove; 106. third inner groove; 107. fourth inner groove; 108. fifth inner groove; 109. sixth inner groove; 2. rotor connecting shaft; 201. long groove; 202. oil storage tank; 203. first oil outlet hole; 204. second oil outlet hole; 3. first connecting shaft; 4. second connecting shaft; 5. first flange; 6. extension shaft; 7. second flange; 8. third connecting shaft; 9. second buffer shaft; 11. spacer; 12. inner shaft; 13. oil hole; 14. heat exchange area; 15. oil injection hole; 16. oil overflow hole. DETAILED DESCRIPTION

[0055] The following is combined with Figure 1-6 This application is described in further detail.

[0056] The embodiment of the present application discloses a motor shaft of an electric vehicle.

[0057] Example 1

[0058] Reference Figure 1 The shaft body 1 includes a first flange 5, a rotor connecting shaft 2 fixedly connected to the rotor is provided on one side of the first flange 5, and a first connecting shaft 3 fixedly provided with a bearing is provided on the side of the rotor connecting shaft 2 away from the first flange 5; an extension shaft 6 is provided on the other side of the first flange 5, and a second connecting shaft 4 fixedly provided with a bearing is provided on the side of the extension shaft 6 away from the first flange 5, a second flange 7 is provided on the end of the second connecting shaft 4 away from the first flange 5, a third connecting shaft 8 is provided on the end of the second flange 7 away from the first flange 5, and a second buffer shaft 9 is provided on the end of the third connecting shaft 8 away from the second flange 7, the shaft body 1 is a whole shaft structure, the rotor connecting shaft 2 is nested and fixedly connected with the rotor of the electric vehicle motor to form a rotor shaft, and the first connecting shaft 3 and the second connecting shaft 4 are nested and fixedly connected with the bearings of the electric vehicle motor;

[0059] Reference Figure 2The shaft body 1 is provided with an oil storage tank 101, and the oil storage tank 101 stores pressurized cooling oil provided from the outside, which is used to supply the cooling oil required by the shaft during operation. A plurality of oil storage tanks 202 are evenly distributed on the circumference of one side of the circumferential surface of the rotor connecting shaft 2 close to the first flange 5. The oil storage tanks 202 form a groove-shaped structure on the surface for storing cooling oil and providing a sufficient amount of cooling oil. A first oil outlet 203 is provided in the oil storage tank 202, and the first oil outlet 203 is connected to the oil circuit of the oil storage tank 101. Each oil storage tank 202 is provided with a first oil outlet 203, and these oil outlets are connected to the oil circuit of the oil storage tank 101. When the shaft body 1 is working and rotating, the cooling oil provided by the oil storage tank 101 centrifugally enters the rotor punching from the first oil outlet 203, and gradually diffuses radially outward. In the process of centrifugal diffusion, the cooling oil takes away the heat of the electric vehicle motor rotor, thereby realizing the function of cooling the rotor. The heat dissipation method is direct and the cooling efficiency is high.

[0060] A plurality of second oil outlet holes 204 are evenly distributed on the circumference of one side of the circumferential surface of the rotor connecting shaft 2 close to the first connecting shaft 3. The second oil outlet holes 204 are connected to the oil circuit of the oil storage tank 101, and guide the cooling oil to the oil circuit connected to the oil storage tank 101.

[0061] The first oil outlet hole 203 and the second oil outlet hole 204 are respectively connected to the oil circuit of the oil storage tank 101. When the cooling oil is stored in the oil storage tank 202, the cooling oil can flow into the oil circuit connected to the oil storage tank 101 through the first oil outlet hole 203 and the second oil outlet hole 204, thereby supplying the required cooling for the rotating shaft.

[0062] Reference Figure 3 The bottom of the second oil outlet hole 204 is connected to the second oil hole 103, and the bottom of the second oil hole 103 that passes through the circumferential wall of the rotor connecting shaft 2 is connected to the oil circuit of the oil storage tank 101. The cooling oil can flow from the oil storage tank 101 through the second oil outlet hole 204, enter the second oil hole 103 through the connecting channel, and finally achieve cooling in the corresponding area inside the rotor connecting shaft 2, thereby improving the effective flow of the cooling oil and improving the cooling efficiency of the cooling system.

[0063] Reference Figure 4 The bottom of the first oil outlet hole 203 is connected with the first oil hole 102, and the bottom of the first oil hole 102 that passes through the circumferential wall of the rotor connecting shaft 2 is connected with the oil circuit of the oil storage tank 101. The cooling oil can flow from the oil storage tank 101 through the first oil hole 102 and enter the first oil outlet hole 203 through the connecting channel, and finally cool down the corresponding area in the rotor connecting shaft 2, thereby improving the effective flow of the cooling oil and improving the cooling efficiency of the cooling system.

[0064] Reference Figure 5The oil storage tank 101 is located in a blind hole in the rotating shaft body 1, the opening of the oil storage tank 101 is located at the end facing the second buffer shaft 9, the bottom of the hole of the oil storage tank 101 is located at the end of the first connecting shaft 3, and the oil storage tank 101 is a closed hole for containing cooling oil. The cooling oil is stored in the oil storage tank 101 in the rotating shaft body 1, which realizes the input and divergence of the cooling oil in the connecting shaft cooling system, which helps to improve the heat dissipation effect and cooling efficiency of the motor.

[0065] Reference Figure 3 , Figure 4 A plurality of long grooves 201 are evenly distributed on the circumferential surface of the rotor connecting shaft 2. The length of the long grooves 201 runs through the length of the rotor connecting shaft 2. The long grooves 201 help to enhance the circumferential friction and fastening between the rotor and the rotor connecting shaft 2, store cooling oil in the grooves, and improve the cooling effect. The long grooves 201 improve the cooling effect and also dissipate heat through the movement of the cooling oil, which helps to control the temperature of the motor and improve the thermal management performance. Even if impurities or foreign matter accumulate in the long grooves, since the grooves run through the entire length, the cooling oil can still continue to flow in other parts, thereby improving the fault tolerance of the system and increasing the cooling oil capacity of the entire connecting shaft surface, which helps to retain more cooling oil during operation and improve the performance and reliability of the motor.

[0066] The implementation principle of Example 1 of the present application is as follows: the rotating shaft body 1 adopts an integral shaft structure, and an oil storage tank 101 is arranged inside. The oil storage tank 101 is used to store pressurized cooling oil provided from the outside. The circumferential surface of the rotor connecting shaft 2 is evenly distributed on one side of the circumference close to the first flange 5. These oil storage tanks 202 are used to store cooling oil. The first oil outlet hole 203 and the second oil outlet hole 204 are respectively connected to the oil circuit of the oil storage tank 101, and the cooling oil is guided to the oil circuit connected to the oil storage tank 101, so as to realize the cooling of the rotor punchings fixed on the outer circumference of the rotating shaft;

[0067] The cooling oil can flow from the oil storage tank 101 through the oil storage tank 202, through the first oil outlet hole 203 and the second oil outlet hole 204, and flow into the oil path connected to the oil storage tank 101. The first oil outlet hole 203 penetrates the circumferential wall of the rotor connecting shaft 2 and is connected to the first oil hole 102; the second oil outlet hole 204 penetrates the circumferential wall of the rotor connecting shaft 2 and is connected to the second oil hole 103. The cooling oil flow path can effectively cool the shaft and related components.

[0068] The long groove 201 is arranged on the circumferential surface of the rotor connecting shaft 2, which helps to enhance the circumferential friction and fastening effect between the rotor and the rotor connecting shaft 2. The long groove 201 can also store cooling oil to enhance the cooling effect, and dissipate heat through the movement of the cooling oil to improve the thermal management performance;

[0069] Embodiment 1 realizes the cooling system of the electric vehicle motor through the design of the oil storage bin, the oil storage tank, the oil outlet hole and the long groove, improves the cooling effect, and helps to ensure the stable operation of the motor and extend its service life.

[0070] Example 2

[0071] Reference Figure 6 The shaft body 1 includes a rotor connecting shaft 2, a first connecting shaft 3, an oil storage tank 101, a first flange 5, an inner shaft 12, a spacer 11, an oil injection hole 15 and an oil overflow hole 16;

[0072] An oil storage tank 101 is provided inside the rotor connecting shaft 2, and a heat exchange area 14 is provided inside the rotor connecting shaft 2. An inner shaft 12 is provided at one end of the first flange 5 away from the extension shaft 6 and fixedly connected together. The inner shaft 12 extends into the heat exchange area 14 inside the rotor connecting shaft 2. The inner shaft 12 is connected to the oil path in the heat exchange area 14. An oil storage tank 101 is provided through the middle of the inner shaft 12 for storing cooling oil, which is a part of the cooling system. The cooling oil in the oil storage tank 101 enters the heat exchange area 14 to achieve the functions of heat dissipation and heat exchange.

[0073] A plurality of spacers 11 are sleeved on the outer circumference of the inner shaft 12. The spacers 11 are evenly distributed axially along the outer circumference of the inner shaft 12. The outer circumference of the spacers 11 is fixedly connected to the hole wall of the heat exchange area 14 in the rotor connecting shaft 2. The spacers 11 divide the heat exchange area 14 into a plurality of separate heat exchange areas 14. The spacers 11 are provided with oil holes 13 penetrating along a plurality of axial directions. The oil holes 13 connect the oil passages of the separate heat exchange areas 14, so that the cooling oil passes through and flows in the separate heat exchange areas 14, thereby realizing the cooling and heat dissipation functions of the rotor and stator of the motor of the new energy vehicle;

[0074] The circumferential wall of the rotor connecting shaft 2 is provided with a plurality of oil injection holes 15 radially penetrating inside and outside. The oil injection holes 15 connect the heat exchange area 14 with the external oil circuit. When the motor is working, the rotor connecting shaft 2 drives the rotor to rotate at a high speed. Under the action of the centrifugal force of the rotor, the cooling oil radially disperses from the oil injection holes 15 in the middle of the rotor connecting shaft 2, enters the inside of the rotor punching sheet and diffuses, so as to achieve the cooling and heat dissipation effect of the rotor. At the same time, the cooling oil radially dispersed from the oil injection holes 15 on both sides of the rotor connecting shaft 2 synchronously cools and dissipates the stator coil.

[0075] The first connecting shaft 3 is provided with an oil overflow hole 16, which connects the heat exchange area 14 with the external oil circuit. The diameter of the oil overflow hole 16 is smaller than the diameter of the heat exchange area 14. Through these holes, the heat exchange area 14 can be connected with the external oil circuit to achieve the circulation and cooling function of the oil.

[0076] The implementation principle of Example 2 of the present application is as follows: the cooling oil enters the oil storage tank 101 through the through channel in the inner shaft 12 to ensure the supply of cooling oil. The oil storage tank 101 and the heat exchange area 14 are arranged inside. The rotor connecting shaft 2 is provided with an oil storage tank 101 and a heat exchange area 14 to ensure that the cooling oil enters the heat exchange area 14 for heat dissipation and heat exchange. The spacers 11 are evenly distributed along the outer circumference of the inner shaft 12 to divide the heat exchange area 14 into a number of areas. Each area is connected to the oil circuit through the oil hole 13. The oil passes through and flows in the heat exchange area 14. The circumferential wall of the rotor connecting shaft 2 is provided with an oil injection hole 15 to connect the heat exchange area 14 with the external oil circuit. When the motor is working, the rotor connecting shaft 2 drives the rotor to rotate at a high speed, and the cooling oil is radially dispersed from the oil injection hole 15, enters the inside of the rotor punching and diffuses, thereby achieving the cooling and heat dissipation effect of the rotor. The oil injection holes 15 on both sides of the rotor connecting shaft 2 are radially The dissipated cooling oil is used to cool down and dissipate the stator coil synchronously. An oil overflow hole 16 is provided on the first connecting shaft 3. The oil overflow hole 16 connects the heat exchange area 14 with the external oil circuit to realize the oil circulation and cooling function of the heat exchange area 14. In Example 2, through the design of the inner shaft, spacer blocks, oil spray holes and oil overflow holes, the cooling oil exchanges heat between the rotor punching sheets and takes away the heat of rotation and sprays and cools the winding parts of the stator, thereby realizing the cooling and heat dissipation functions of the new energy vehicle motor. It can effectively dissipate heat during operation and maintain it within a suitable temperature range.

[0077] The above is only an exemplary embodiment of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the disclosure of the specification and the truth of practice, it will be easy for those skilled in the art to think of other embodiments of the present disclosure. This application is intended to cover any variation, use or adaptive change of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field that are not recorded in the present disclosure.

Claims

1. A motor shaft of an electric vehicle, comprising a shaft body (1), characterized in that: An oil storage tank (101) is provided inside the rotating shaft body (1); The rotating shaft body (1) comprises a first flange (5), a rotor connecting shaft (2) is arranged on one side of the first flange (5), and a first connecting shaft (3) fixed with a bearing is arranged on a side of the rotor connecting shaft (2) away from the first flange (5); An extension shaft (6) is provided on the other side of the first flange (5); a second connecting shaft (4) fixed with a bearing is provided on the side of the extension shaft (6) away from the first flange (5); a second flange (7) is provided on the end of the second connecting shaft (4) away from the first flange (5); a fourth inner groove (107) is provided at the connecting end of the second flange (7) and the second connecting shaft (4); A third connecting shaft (8) is provided at one end of the second flange (7) away from the first flange (5), and a second buffer shaft (9) is provided at one end of the third connecting shaft (8) away from the second flange (7); A plurality of oil storage grooves (202) are evenly distributed on the circumference of one side of the circumferential surface of the rotor connecting shaft (2) close to the first flange (5), a first oil outlet hole (203) is arranged in the oil storage groove (202), and the first oil outlet hole (203) is connected to the oil passage of the oil storage tank (101); A plurality of second oil outlet holes (204) are evenly distributed on the circumference of one side of the circumferential surface of the rotor connecting shaft (2) close to the first connecting shaft (3), and the second oil outlet holes (204) are connected to the oil passage of the oil storage tank (101).

2. The electric vehicle motor shaft according to claim 1, characterized in that: The bottom of the first oil outlet hole (203) is in communication with the first oil hole (102), and the bottom of the first oil hole (102) penetrating the circumferential wall of the rotor connecting shaft (2) is in communication with the oil passage of the oil storage tank (101).

3. The electric vehicle motor shaft according to claim 1, characterized in that: The bottom of the second oil outlet hole (204) is in communication with the second oil hole (103), and the bottom of the second oil hole (103) penetrating the circumferential wall of the rotor connecting shaft (2) is in communication with the oil passage of the oil storage tank (101).

4. The electric vehicle motor shaft according to claim 3, characterized in that: The oil storage bin (101) is located in a blind hole in the rotating shaft body (1), the opening of the oil storage bin (101) is located at one end of the second buffer shaft (9), and the bottom of the hole of the oil storage bin (101) is located at the end of the first connecting shaft (3).

5. The electric vehicle motor shaft according to claim 4, characterized in that: A plurality of long grooves (201) are evenly distributed on the circumferential surface of the rotor connecting shaft (2), and the length of the long grooves (201) runs through the length of the rotor connecting shaft (2).

6. The electric vehicle motor shaft according to claim 4, characterized in that: The rotating shaft body (1) is provided with a first inner groove (104), a second inner groove (105), a third inner groove (106), a fourth inner groove (107), a fifth inner groove (108), and a sixth inner groove (109).

7. The electric vehicle motor shaft according to claim 6, characterized in that: The first inner groove (104) is provided at a connection position between the first connecting shaft (3) and the rotor connecting shaft (2); The second inner groove (105) is provided at the connection position between the first flange (5) and the extension shaft (6); The third inner groove (106) is provided at the connection position between the extension shaft (6) and the second connection shaft (4); The fourth inner groove (107) is provided at the connection position between the second connecting shaft (4) and the second flange (7); The fifth inner groove (108) is provided at the connection position between the second flange (7) and the third connection shaft (8); The sixth inner groove (109) is arranged at the connection position between the third connecting shaft (8) and the second buffer shaft (9).

8. The electric vehicle motor shaft according to claim 1, characterized in that: The rotating shaft body (1) comprises a rotor connecting shaft (2), a first connecting shaft (3), an oil storage tank (101), a first flange (5), an inner shaft (12), a spacer (11), an oil injection hole (15) and an oil overflow hole (16); An oil storage tank (101) is provided inside the rotor connecting shaft (2), and a heat exchange area (14) is provided inside the rotor connecting shaft (2); An inner shaft (12) is provided at one end of the first flange (5) away from the extension shaft (6) and is fixedly connected thereto. The inner shaft (12) extends into a heat exchange area (14) in the rotor connecting shaft (2). The inner shaft (12) is in communication with an oil path in the heat exchange area (14). An oil storage tank (101) is provided in the middle of the inner shaft (12); A plurality of spacers (11) are sleeved on the outer circumference of the inner shaft (12), the spacers (11) are evenly distributed axially along the outer circumference of the inner shaft (12), and the outer circumference of the spacers (11) is fixedly connected to the hole wall of the heat exchange area (14) in the rotor connecting shaft (2); The spacer (11) divides the heat exchange area (14) into a plurality of separate heat exchange areas (14); the spacer (11) is provided with a plurality of oil holes (13) penetrating along the axial direction; the oil holes (13) connect the oil paths of the separate heat exchange areas (14); The circumferential wall of the rotor connecting shaft (2) is provided with a plurality of oil injection holes (15) penetrating radially inside and outside, and the oil injection holes (15) connect the heat exchange area (14) with an external oil circuit; The first connecting shaft (3) is provided with an oil overflow hole (16), the oil overflow hole (16) enables the heat exchange area (14) to communicate with an external oil circuit, and the diameter of the oil overflow hole (16) is smaller than the diameter of the heat exchange area (14).

Images