Rotor shaft and motor

Abstract

The utility model discloses a rotor shaft, comprising a shaft body which comprises an inner cavity, one end of the inner cavity along the axial direction is provided with a first oil inlet pipeline, and the other end of the inner cavity is closed; a plurality of first oil outlet holes and a plurality of second oil outlet holes are formed in the outer wall of the shaft body, and the total area of the first oil outlet holes and the total area of the second oil outlet holes are the same; the outer wall of the oil pipe and the cavity wall of the inner cavity form a cooling flow channel; the oil pipe comprises a first end and a second end, the first end is hermetically communicated with the first oil inlet pipeline, and the second end is closed; an oil throwing hole is formed in the outer surface of the oil pipe and is communicated with the oil pipe and the cooling runner; the distance between the oil throwing hole and the first oil outlet hole is equal to the distance between the oil throwing hole and the second oil outlet hole. According to the utility model, the front and back oil quantity of the rotor shaft can be uniformly distributed, and the heat dissipation efficiency of the rotor is improved. The utility model also provides a motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor shaft and a motor. Background Art

[0002] As the power density of new energy motors increases, the heat dissipation of permanent magnet steel also increases accordingly. As the component with the highest raw material cost in the rotor, permanent magnet material has a use limit for temperature. Generally speaking, the higher the grade of permanent magnet, the higher the temperature resistance and the higher the price.

[0003] High temperature will reduce the efficiency of permanent magnets and even cause irreversible demagnetization, thus affecting the performance of the motor. Since oil itself is neither magnetic nor conductive, and can be directly cooled by contact with the rotor, it can greatly improve the cooling efficiency. Therefore, more and more OEMs choose to use oil cooling. At present, the rotor shaft is usually made into a hollow shaft, and the oil enters the hollow shaft. The oil is thrown out by the centrifugal force of high-speed rotation. The heat is released into the oil through the part where the cooling oil flows. The oil flows through an external heat exchanger to achieve rotor cooling. However, in this way, the oil enters from one side of the rotor shaft, and the amount of oil can only be distributed according to the size of the oil hole on the rotor shaft. At different speeds, the distribution amount is uneven and the cooling effect is poor. Utility Model Content

[0004] The utility model aims to solve the problem of uneven oil distribution at the front and rear of the rotor shaft. The utility model provides a rotor shaft and a motor, which can evenly distribute the oil at the front and rear of the rotor shaft and improve the heat dissipation efficiency of the rotor.

[0005] In order to solve the above technical problems, the embodiment of the utility model discloses a rotor shaft, comprising:

[0006] The shaft body comprises an inner cavity, wherein one end of the inner cavity along the axial direction thereof is provided with a first oil inlet pipeline, and the other end is closed; the outer wall of the shaft body is provided with a first oil outlet hole and a second oil outlet hole arranged at intervals along the axial direction, wherein the first oil outlet hole and the second oil outlet hole each comprise a plurality of holes arranged at intervals along the circumferential direction of the shaft body, and the total opening area of ​​the plurality of the first oil outlet holes and the plurality of the second oil outlet holes is the same;

[0007] The oil pipe is located in the inner cavity, and along the radial direction of the shaft body, the outer wall of the oil pipe and the cavity wall of the inner cavity form a cooling channel; along the axial direction, the oil pipe includes a first end and a second end, the first end is sealed and connected to the first oil inlet pipeline, and the second end is closed; the outer surface of the oil pipe is provided with an oil-flinging hole, and the oil-flinging hole connects the oil pipe and the cooling channel; the distance from the oil-flinging hole to the first oil outlet hole and the second oil outlet hole is equal.

[0008] By adopting the above technical solution, the external cooling medium enters the first oil inlet pipeline and then flows into the oil pipe. The cooling medium in the oil pipe enters the cooling channel through the oil throwing hole under the centrifugal force of high-speed rotation. The cooling medium flowing in the cooling channel initially realizes the cooling of the rotor shaft.

[0009] The cooling medium in the cooling channel is also partially thrown toward the first oil outlet and flows out from the first oil outlet under the centrifugal force of high-speed rotation, and partially thrown toward the second oil outlet and flows out from the second oil outlet. Since the distance between the oil-throwing holes and the first oil outlet and the second oil outlet is equal, and the total area of ​​the openings of the multiple first oil outlets and the multiple second oil outlets is the same, the amount of oil received by the multiple first oil outlets and the multiple second oil outlets and flowing out of the cooling channel is also the same, thereby achieving uniform oil distribution before and after the rotor shaft, and not being affected by the speed and working conditions of the rotor, so that the surface temperature of the magnetic steel can be reduced, and a better cooling effect of the rotor can be achieved. Further, the efficiency and power density of the motor are improved, and the grade of the permanent magnet material is reduced to achieve the purpose of reducing costs.

[0010] According to another specific embodiment of the utility model, the oil-swinging hole is located on a first radial line, the first oil outlet hole is located on a second radial line, the second oil outlet hole is located on a third radial line, the spacing distance between the first radial line and the second radial line is equal to the spacing distance between the first radial line and the third radial line, and the first radial line, the second radial line and the third radial line are parallel to each other and perpendicular to the axial direction of the oil pipe.

[0011] The above technical solution ensures that the paths from the oil-slinging hole to the first oil outlet hole and the second oil outlet hole are equal, so that the amount of oil slinged from the oil-slinging hole to the first oil outlet hole and the second oil outlet hole is equal, thereby ensuring uniform oil distribution before and after the rotor shaft.

[0012] According to another specific embodiment of the present utility model, the number of the first oil outlet holes and the second oil outlet holes are the same, and the size of each of the first oil outlet holes and each of the second oil outlet holes is the same.

[0013] By adopting the above technical solution, the number and size of the first oil outlet holes and the second oil outlet holes are the same, so the first oil outlet holes and the second oil outlet holes can be processed and manufactured using the same set of cutting tools, which is beneficial to processing and manufacturing and saves costs.

[0014] According to another specific embodiment of the present invention, the first end includes a connecting portion, the cavity wall of the inner cavity includes a conical surface, and the conical surface is tangent to and abuts against the connecting portion.

[0015] According to another specific embodiment of the present invention, the connecting portion is in a spherical shape.

[0016] By adopting the above technical solution, the conical surface and the connecting part are tangent to each other, thereby realizing the sealed connection between the first end of the oil pipe and the first oil inlet pipeline. On the one hand, it prevents the cooling medium of the cooling channel from leaking into the oil pipe and / or the first oil inlet pipeline from the connection between the oil pipe and the first oil inlet pipeline. On the other hand, it also prevents the cooling medium of the oil pipe and / or the first oil inlet pipeline from leaking into the cooling channel from the connection between the two, thereby ensuring that the oil volume of the first oil outlet and the second oil outlet is evenly distributed, achieving a better cooling effect.

[0017] According to another specific embodiment of the utility model, a connecting piece is provided at the second end, a second pipeline is provided at the other end of the inner cavity along its axial direction, and the connecting piece closes the second end of the oil pipe and the second pipeline.

[0018] By adopting the above technical solution, the connecting piece closes the second end of the oil pipe to prevent the cooling medium in the oil pipe from flowing out from the second end of the oil pipe, thereby ensuring that the cooling medium in the oil pipe can flow out from the oil-swinging hole; the connecting piece closes the second pipeline to prevent the cooling medium in the cooling channel from flowing out from the second pipeline, thereby ensuring that the cooling medium in the cooling channel can flow out from the first oil outlet hole and the second oil outlet hole, that is, the cooling medium is fully utilized to ensure the cooling efficiency of the rotor.

[0019] According to another specific embodiment of the present utility model, the connecting member includes a sealing groove, and the second end of the oil pipe is inserted into the sealing groove and fixedly connected thereto.

[0020] By adopting the above technical solution, the second end of the oil pipe is inserted into the sealing groove and fixedly connected thereto, that is, the bottom wall of the sealing groove blocks the port of the second end of the oil pipe, thereby achieving the closure of the second end of the oil pipe and preventing the cooling medium in the oil pipe from flowing out of the second end of the oil pipe.

[0021] According to another specific embodiment of the present invention, the outer wall of the connecting piece and the inner wall of the second pipeline are interference fit.

[0022] By adopting the above technical solution, the outer wall of the connecting piece and the inner wall of the second pipeline are radially interference fit, and then the connecting piece closes the second end of the oil pipe, thereby realizing the closing of the second pipeline by the connecting piece, preventing the cooling medium of the cooling channel from entering the second pipeline and affecting the cooling effect.

[0023] According to another specific embodiment of the utility model, the oil-slinging holes include two, and the two oil-slinging holes are symmetrically distributed on the oil pipe along its circumference.

[0024] By adopting the above technical solution, the two symmetrically distributed oil-slinging holes can ensure the oil-slinging efficiency and avoid excessive accumulation of cooling medium in the oil pipe on the one hand, and also ensure the dynamic balance of the rotor on the other hand, thereby ensuring the performance and operation stability of the motor.

[0025] According to another specific implementation of the utility model, a conical surface is provided between the first oil outlet hole and the first oil inlet pipeline.

[0026] By adopting the above technical solution, compared with the existing implementation scheme, the present application reduces unnecessary guide surfaces, thereby simplifying the structure of the rotor shaft.

[0027] The embodiment of the utility model further discloses a motor based on the above-mentioned rotor shaft, including the above-mentioned rotor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional diagram showing a rotor shaft according to an embodiment of the utility model;

[0029] Figure 2 A three-dimensional diagram showing an oil pipe according to an embodiment of the utility model;

[0030] Figure 3 A cross-sectional view of the shaft body of an embodiment of the utility model is shown;

[0031] Figure 4 A cross-sectional view of a rotor shaft according to an embodiment of the utility model is shown;

[0032] Figure 5 Show Figure 4 A partial enlarged view of the middle F area;

[0033] Figure 6 Show Figure 4 A partial enlarged view of the E area. DETAILED DESCRIPTION

[0034] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0035] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0036] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0037] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0038] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0039] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] refer to Figures 1 to 3 The present application provides a rotor shaft 1, comprising: a shaft body 2 and an oil pipe 3. Among them,

[0041] The shaft body 2 includes an inner cavity 20, and the inner cavity 20 is arranged along its axial direction ( Figure 3 The first oil inlet pipeline 21 is provided at one end of the inner cavity 20 (shown in the Z direction), and the other end is closed. Exemplarily, the first oil inlet pipeline 21 is provided at one axial end of the inner cavity 20, and the other end is closed, so that the external cooling medium (such as cooling oil) enters the inner cavity 20 of the shaft body 2 through the first oil inlet pipeline 21, and cannot flow out directly from the other end, thereby ensuring the cooling effect of the shaft body 2.

[0042] The outer wall 200 of the shaft body 2 is provided with a Figure 3 The first oil outlet hole 23 and the second oil outlet hole 24 are arranged at intervals (as shown in the Z direction). Exemplarily, the first oil outlet hole 23 is close to the first oil inlet pipeline 21 in the axial direction, and the second oil outlet hole 24 is close to the other end of the inner cavity 20. The first oil outlet hole 23 and the second oil outlet hole 24 are used for the cooling medium to flow out of the inner cavity 20, and other motor components (such as windings) outside the inner cavity 20 are cooled.

[0043] The first oil outlet hole 23 and the second oil outlet hole 24 both include a circumferential direction ( Figure 1The plurality of first oil outlet holes 23 and the plurality of second oil outlet holes 24 are arranged at intervals (indicated by the R direction), and the total opening area of ​​the plurality of first oil outlet holes 23 and the plurality of second oil outlet holes 24 is the same. That is, the total amount of fluid that can flow out of the plurality of first oil outlet holes 23 is equal to the total amount of fluid that can flow out of the plurality of second oil outlet holes 24.

[0044] In one embodiment, the sizes and numbers of the first oil outlet holes 23 and the second oil outlet holes 24 are different. For example, four first oil outlet holes 23 are provided and six second oil outlet holes 24 are provided. The orifice area of ​​each first oil outlet hole 23 is slightly larger than the orifice area of ​​each second oil outlet hole 24, so that the total orifice area of ​​the four first oil outlet holes 23 and the six second oil outlet holes 24 are the same, that is, the total amount of fluid that can flow out of the two is the same.

[0045] In another embodiment, the number of the first oil outlet holes 23 and the second oil outlet holes 24 are the same, for example, four, and each first oil outlet hole 23 and each second oil outlet hole 24 are the same in size, so that the total amount of fluid that can flow out of the four first oil outlet holes 23 and the four second oil outlet holes 24 is the same.

[0046] Preferably, the number of the first oil outlet holes 23 and the second oil outlet holes 24 of the present application are the same, both are four. Correspondingly, the first oil outlet holes 23 and the second oil outlet holes 24 are the same size, so that the first oil outlet holes 23 and the second oil outlet holes 24 can be processed and manufactured using the same set of cutting tools, which is conducive to processing and manufacturing and saves costs.

[0047] It should be noted that the present application does not limit the number and size of the first oil outlet holes 23 and the second oil outlet holes 24. The number of the first oil outlet holes 23 and the second oil outlet holes 24 can also be six, eight, etc., as long as the total opening area of ​​the multiple first oil outlet holes 23 and the multiple second oil outlet holes 24 is the same.

[0048] refer to Figures 2 to 4 The oil pipe 3 is located in the inner cavity 20, along the radial direction of the shaft body 2 ( Figure 4 The outer wall of the oil pipe 3 and the wall of the inner cavity 20 form a cooling channel 4. For example, the cross section of the cooling channel 4 is annular. In other words, the oil pipe 3 and the shaft body 2 are coaxial. The cooling medium in the cooling channel 4 can flow around the wall of the inner cavity 20 at 360 degrees to better cool the rotor.

[0049] Along the axial direction ( Figure 2 The oil pipe 3 includes a first end 30 and a second end 31. The first end 30 is sealed and connected to the first oil inlet pipeline 21, and the second end 31 is closed. Exemplarily, the external cooling medium enters from the first oil inlet pipeline 21 and then enters the oil pipe 3 from the first end 30.

[0050] The first end 30 and the first oil inlet pipeline 21 are sealed and connected to prevent the cooling medium from leaking from the gap at the connection between the first end 30 and the first oil inlet pipeline 21, thereby causing the amount of oil (the amount of cooling medium) at the first oil outlet hole 23 to be greater than the amount of oil at the second oil outlet hole 24, that is, the oil distribution is uneven and the cooling effect is poor.

[0051] The outer surface of the oil pipe 3 is provided with an oil-slinging hole 32. Exemplarily, the oil-slinging hole 32 connects the oil pipe 3 and the cooling channel 4. The cooling medium of the first oil inlet line 21 can enter the oil pipe 3, then enter the cooling channel 4 through the oil-slinging hole 32, and then flow out from the first oil outlet hole 23 and the second oil outlet hole 24 to achieve cooling of the rotor.

[0052] Exemplarily, the two oil-slinging holes 32 include two oil-slinging holes 32, which are symmetrically distributed along the circumference of the oil pipe 3. That is, the two oil-slinging holes 32 are spaced 180 degrees apart along the circumference of the oil pipe 3.

[0053] Furthermore, the two symmetrically distributed oil-slinging holes 32 can ensure the oil-slinging efficiency and prevent excessive accumulation of cooling medium in the oil pipe 3 on the one hand, and also ensure the dynamic balance of the rotor on the other hand, thereby ensuring the performance and operation stability of the motor.

[0054] The distance L2 from the oil-slinging hole 32 to the first oil outlet hole 23 is equal to the distance L1 from the oil-slinging hole 32 to the second oil outlet hole 24 .

[0055] In other words, the oil-slinging hole 32 is located on the first radial line B, the first oil outlet hole 23 is located on the second radial line C, and the second oil outlet hole 24 is located on the third radial line A. The interval H2 between the first radial line B and the second radial line C is equal to the interval H1 between the first radial line B and the third radial line A. The first radial line B, the second radial line C and the third radial line A are parallel to each other and perpendicular to the axial direction of the oil pipe 3 ( Figure 4 Z direction).

[0056] That is, Figure 4 As shown, the connecting line of the axially adjacent first oil outlet hole 23, second oil outlet hole 24 and oil-slinging hole 32 forms an isosceles triangle. The setting of the connecting line of the three forming an isosceles triangle ensures that the paths from the oil-slinging hole 32 to the first oil outlet hole 23 and the second oil outlet hole 24 are equal, so that the amount of oil slinging from the oil-slinging hole 32 to the first oil outlet hole 23 and the second oil outlet hole 24 is equal, thereby ensuring that the oil amount is evenly distributed in front and behind the rotor shaft.

[0057] By adopting the above technical solution, the external cooling medium enters the first oil inlet pipeline 21 and then flows into the oil pipe 3. The cooling medium in the oil pipe 3 enters the cooling channel 4 through the oil throwing hole 32 under the centrifugal force of high-speed rotation. The cooling medium flowing in the cooling channel 4 initially realizes the cooling of the rotor shaft.

[0058] The cooling medium of the cooling channel 4 is also partially thrown toward the first oil outlet 23 and flows out from the first oil outlet 23 under the centrifugal force of high-speed rotation, and partially thrown toward the second oil outlet 24 and flows out from the second oil outlet 24. Since the distance between the oil-throwing hole 32 and the first oil outlet 23 and the second oil outlet 24 is equal, and the total area of ​​the openings of the plurality of first oil outlets 23 and the plurality of second oil outlets 24 is the same, the amount of oil received by the first oil outlet 23 and the second oil outlet 24 and flowing out of the cooling channel 4 is also the same, thereby achieving uniform oil distribution before and after the rotor shaft, and not being affected by the speed and working conditions of the rotor, so that the surface temperature of the magnetic steel can be reduced, and a better cooling effect of the rotor can be achieved. Further, the efficiency and power density of the motor are improved, and the grade of the permanent magnet material is reduced to achieve the purpose of reducing costs.

[0059] refer to Figure 4 and Figure 5 In some possible implementations, the first end 30 includes a connecting portion 300, and the cavity wall of the inner cavity 20 includes a conical surface 201, and the conical surface 201 is tangent to and abuts against the connecting portion 300. Exemplarily, the conical surface 201 and the first oil inlet pipeline 21 are arranged at an obtuse angle.

[0060] The conical surface 201 and the connecting portion 300 are tangentially abutted against each other, thereby achieving sealed connection between the first end 30 of the oil pipe 3 and the first oil inlet pipeline 21. On the one hand, it prevents the cooling medium of the cooling channel 4 from leaking into the oil pipe 3 and / or the first oil inlet pipeline 21 from the connection between the oil pipe 3 and the first oil inlet pipeline 21. On the other hand, it also prevents the cooling medium of the oil pipe 3 and / or the first oil inlet pipeline 21 from leaking into the cooling channel 4 from the connection between the two, thereby ensuring that the oil volume of the first oil outlet hole 23 and the second oil outlet hole 24 is evenly distributed, achieving a better cooling effect.

[0061] In some possible implementations, the connecting portion 300 is spherical. Exemplarily, the connecting portion 300 is formed by extrusion to form an arc that can be tangent to the conical surface 201, so that the first end 30 of the oil pipe 3 and the first oil inlet pipeline 21 are sealed and connected through the tangency of the arc and the conical surface 201.

[0062] refer to Figure 4 and Figure 6 In some possible implementations, the second end 31 is provided with a connecting piece 33, and the inner cavity 20 is arranged along its axial direction ( Figure 6 The other end (shown in the Z direction) (ie the closed end mentioned above) is provided with a second pipeline 22, and the connecting piece 33 closes the second end 31 of the oil pipe 3 and the second pipeline 22.

[0063] Exemplarily, the connector 33 closes the second end 31 of the oil pipe 3 to prevent the cooling medium in the oil pipe 3 from flowing out from the second end 31 of the oil pipe 3, thereby ensuring that the cooling medium in the oil pipe 3 can flow out from the oil-throwing hole 32; the connector 33 closes the second pipeline 22 to prevent the cooling medium in the cooling channel 4 from flowing out from the second pipeline 22, thereby ensuring that the cooling medium in the cooling channel 4 can flow out from the first oil outlet hole 23 and the second oil outlet hole 24, that is, the cooling medium is fully utilized to ensure the cooling efficiency of the rotor.

[0064] On the other hand, the connector 33 closes the second pipeline 22 so that the second pipeline 22 forms a dry cavity 25 (ie, a liquid-free environment), allowing a conductive ring or other conductive structure to be arranged in the dry cavity 25 without affecting the rotor performance.

[0065] From another perspective, the use of the connector 33 to seal the second pipeline 22 does not affect the cleaning process of the rotor shaft. Specifically, after the rotor shaft is processed, before the oil pipe 3 is pressed into the inner cavity 20, the inner cavity 20 of the rotor shaft, the first oil inlet pipeline 21 and the second pipeline 22 can be cleaned to remove the debris remaining in the rotor shaft processing process, thereby ensuring the cleanliness of the rotor shaft.

[0066] In some possible implementations, the connector 33 includes a sealing groove 330, and the second end 31 of the oil pipe 3 is inserted into the sealing groove 330 and fixedly connected thereto. Exemplarily, the connector 33 is cylindrical, the sealing groove 330 is also cylindrical, and the second end 31 of the oil pipe 3 is inserted into the sealing groove 330 and fixedly connected thereto by brazing, that is, the bottom wall 332 of the sealing groove 330 blocks the port of the second end 31 of the oil pipe 3, thereby achieving the closure of the second end 31 of the oil pipe 3 and preventing the cooling medium in the oil pipe 3 from flowing out of the second end 31 of the oil pipe 3.

[0067] However, the present application does not limit the sealing method of the second end 31 of the oil pipe 3. The second end 31 of the oil pipe 3 may not be sealed by additional components, but a pipe with one end closed and the other end provided with a connecting portion 300 may be directly used as the oil pipe 3.

[0068] The outer wall 331 of the connecting member 33 and the inner wall 220 of the second pipe 22 are interference fit. Exemplarily, the outer wall 331 of the connecting member 33 and the inner wall 220 of the second pipe 22 are radially ( Figure 6 The second end 31 of the oil pipe 3 is closed by the connector 33, thereby realizing the closure of the second pipeline 22 by the connector 33, and preventing the cooling medium of the cooling channel 4 from entering the second pipeline 22 and affecting the cooling effect.

[0069] For example, reference Figures 4 to 6The first end 30 of the oil pipe 3 is in contact with the conical surface 201 through the connecting portion 300, and the second end 31 of the oil pipe 3 is interference fit with the second pipeline 22 through the connecting piece 33, so that both axial ends of the oil pipe 3 are fixed, that is, the oil pipe 3 is fixed relative to the shaft body 2, thereby avoiding the N (Noise) V (Vibration) H (Harshness) problems of the rotor.

[0070] The process of pressing the oil pipe 3 into the inner cavity 20 is as follows: align the first end 30 of the oil pipe 3 connected with the connecting piece 33 with the second pipeline 22 of the shaft body 2, and the connecting part 300 of the oil pipe 3 first enters the second pipeline 22 and gradually passes through the inner cavity 20 until the connecting part 300 abuts against the conical surface 201 of the inner cavity 20 and can no longer continue to enter. At this time, the connecting piece 33 and the inner wall 220 of the second pipeline 22 are interference fit to achieve relative fixation of the connecting piece 33 and the second pipeline 22, thereby completing the press-fitting of the oil pipe 3.

[0071] refer to Figure 4 and Figure 5 In some possible implementations, a conical surface 201 is provided between the first oil outlet hole 23 and the first oil inlet pipeline 21 .

[0072] In an existing implementation, the rotor hollow shaft is directly used to supply the cooling medium with flow, and multiple guide surfaces (equivalent to the conical surface 201 of the present application) are designed to guide the flow of the cooling medium, which has a complex structure and is difficult to process. However, the present application supplies the cooling medium with flow through the oil pipe 3, which eliminates multiple unnecessary guide surfaces, thereby simplifying the structure of the rotor shaft.

[0073] The present application also provides a motor, comprising the above-mentioned rotor shaft.

[0074] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A rotor shaft, It is characterized in that include: The shaft body comprises an inner cavity, wherein one end of the inner cavity along the axial direction thereof is provided with a first oil inlet pipeline, and the other end thereof is closed; the outer wall of the shaft body is provided with a first oil outlet hole and a second oil outlet hole arranged at intervals along the axial direction thereof, wherein the first oil outlet hole and the second oil outlet hole each comprise a plurality of holes arranged at intervals along the circumference of the shaft body, and the total opening area of ​​the plurality of the first oil outlet holes and the plurality of the second oil outlet holes is the same; The oil pipe is located in the inner cavity, and along the radial direction of the shaft body, the outer wall of the oil pipe and the cavity wall of the inner cavity form a cooling channel; along the axial direction, the oil pipe includes a first end and a second end, the first end is sealed and connected to the first oil inlet pipeline, and the second end is closed; the outer surface of the oil pipe is provided with an oil-flinging hole, and the oil-flinging hole connects the oil pipe and the cooling channel; the distance from the oil-flinging hole to the first oil outlet hole and the second oil outlet hole is equal.

2. The rotor shaft according to claim 1, It is characterized in that The oil-swinging hole is located on a first radial line, the first oil outlet hole is located on a second radial line, and the second oil outlet hole is located on a third radial line. The spacing distance between the first radial line and the second radial line is equal to the spacing distance between the first radial line and the third radial line. The first radial line, the second radial line and the third radial line are parallel to each other and perpendicular to the axial direction of the oil pipe.

3. The rotor shaft according to claim 1, It is characterized in that The number of the first oil outlet holes and the number of the second oil outlet holes are the same, and the size of each of the first oil outlet holes and each of the second oil outlet holes is the same.

4. The rotor shaft according to claim 1, It is characterized in that The first end includes a connecting portion, and the cavity wall of the inner cavity includes a conical surface, and the conical surface is tangent to and abuts against the connecting portion.

5. The rotor shaft according to claim 4, It is characterized in that The connecting portion is in a spherical shape.

6. The rotor shaft according to claim 1, It is characterized in that The second end is provided with a connecting piece, the other end of the inner cavity along the axial direction is provided with a second pipeline, and the connecting piece seals the second end of the oil pipe and the second pipeline.

7. The rotor shaft according to claim 6, It is characterized in that The connecting member comprises a sealing groove, and the second end of the oil pipe is inserted into the sealing groove and fixedly connected thereto.

8. The rotor shaft according to claim 7, It is characterized in that The outer wall of the connecting piece and the inner wall of the second pipeline are interference fit.

9. The rotor shaft according to claim 1, It is characterized in that The oil-slinging holes include two, and the two oil-slinging holes are symmetrically distributed on the oil pipe along its circumference.

10. The rotor shaft according to claim 4, It is characterized in that A conical surface is provided between the first oil outlet hole and the first oil inlet pipeline.

11. A motor, It is characterized in that Comprising the rotor shaft according to any one of claims 1 to 10.

Images