Motor housing and motor

Abstract

The invention provides a motor shell and a motor. The motor housing comprises a casing, which is provided with a threaded connection hole; the end cover covers the end part of the shell, an unthreaded hole corresponding to the threaded connection hole is formed in the end cover, the length of the unthreaded hole is h1, and the expansion coefficient of the end cover is k1; the sealing structure comprises a sealing gasket, the sealing gasket is arranged between the machine shell and the end cover, a through hole is formed in the sealing gasket, the thickness of the sealing gasket is h2, and the expansion coefficient of the sealing gasket is k3; the threaded connecting piece comprises a polished rod section and a screw rod section, the polished rod section is arranged in the unthreaded hole and the through hole in a penetrating mode, the screw rod section is installed in the threaded connecting hole, and the expansion coefficient of the threaded connecting piece is k2; wherein k3 * h2 > = k2 * (h1 + h2)-k1 * h1. According to the motor shell, the sealing performance of the motor can be improved, and the sealing effect of the motor in a high-temperature working environment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor housing and a motor. Background Art

[0002] Electric motors are not only the core power equipment of modern industry, but also have a profound impact on our daily lives and the progress of human society. Their impact on daily life is reflected in the improvement of convenience, comfort, and efficiency, while their influence on human development is reflected in technological progress, leaps in social productivity, and the promotion of sustainable development.

[0003] The electric motor has driven industrial revolutions and technological progress. Its invention and application are a key hallmark of the Second Industrial Revolution, spurring the shift from steam power to electric drive. Advances in motor technology have contributed to the improvement of power systems and the formation of modern industrial systems.

[0004] Motors have promoted a leap in social productivity. The widespread use of motors has made the production process more automated and efficient, greatly improving the efficiency of industrial production. Through technologies such as robots and automated equipment, motors have further liberated human labor and promoted the improvement of productivity.

[0005] Electric motors have driven the development of modern transportation and communications. Motor-driven vehicles (such as cars, trains, and airplanes) have revolutionized how people travel and shortened distances. The use of electric motors in communications equipment (such as servers and base stations) has ensured power supply and facilitated the advent of the information age.

[0006] Motors contribute to sustainable development. Their use in new energy sectors (such as wind and solar power) is driving the development and utilization of clean energy. The expansion of high-efficiency motors and intelligent control systems (such as variable frequency technology) has significantly reduced energy consumption and carbon emissions.

[0007] Motors drive human exploration and innovation. In fields such as aerospace and deep-sea exploration, motor-driven equipment provides technical support for human exploration of the unknown world. In the medical field, motor-driven precision equipment (such as surgical robots) promotes the advancement of medical technology.

[0008] Due to technological advancements, the use cases for many motors are becoming increasingly demanding, and the requirements for their waterproofing are becoming increasingly stringent. This is particularly true for automotive applications, where motors must meet IP68 waterproofing standards. Current motor seals typically use a glue-based sealant, but silicone is prone to aging and difficult to apply. After adding the end caps, the glue can easily squeeze out. Furthermore, the high operating temperatures of the motor further degrade the silicone, reducing the motor's sealing performance. Summary of the Invention

[0009] The main purpose of the present invention is to provide a motor housing and a motor, which can improve the sealing performance of the motor and ensure the sealing effect of the motor in a high-temperature working environment.

[0010] In order to achieve the above object, according to one aspect of the present invention, a motor housing is provided, comprising:

[0011] A casing, wherein a threaded connection hole is provided on the casing;

[0012] The end cover is provided at the end of the housing. A light hole is provided on the end cover corresponding to the threaded connection hole. The length of the light hole is h1, and the expansion coefficient of the end cover is k1.

[0013] The sealing structure includes a sealing gasket, which is arranged between the housing and the end cover, and has a through hole. The sealing gasket has a thickness of h2 and an expansion coefficient of k3;

[0014] The threaded connection part includes a polished rod section and a screw section. The polished rod section is inserted into the polished hole and the through hole, and the screw section is installed in the threaded connection hole. The expansion coefficient of the threaded connection part is k2.

[0015] Among them, k3×h2≥k2×(h1+h2)-k1×h1.

[0016] Furthermore, k3>k1, k3>k2.

[0017] Furthermore, 1mm≤h2≤2mm.

[0018] Furthermore, the sealing structure also includes a sleeve, which is an insulating structure. The sleeve is located on the inner circumference side of the sealing gasket and extends axially from the end face of the sealing gasket. The sleeve is sleeved on the inner circumference wall of the casing.

[0019] Furthermore, an iron core installation position is provided in the casing, and the sleeve extends to the iron core installation position.

[0020] Furthermore, the end cover is provided with a stop structure, the stop structure extends into the casing, and the sleeve is located between the outer peripheral wall of the stop structure and the inner peripheral wall of the casing.

[0021] Furthermore, the outer diameter of the sleeve is R1, the inner diameter is R4, the inner diameter of the casing is R2, the outer diameter of the stop structure is R3, k1×R3×△T1+△L1≤k3×R4×△T1≤k1×R3×△T1+△L1+△L2, where △T1 is the temperature rise, △T1 is the temperature rise, △T1=T1-T, T1 is the current operating temperature of the casing, T is normal temperature, the value range of △L1 is 0-0.09mm, and the value range of △L2 is 0.002mm~0.067mm.

[0022] Furthermore, ΔL2 takes values ​​from P7 / h6, R7 / h6, S7 / h6, T7 / h6, and U7 / h6.

[0023] According to another aspect of the present invention, a motor is provided, comprising a motor housing, wherein the motor housing is the above-mentioned motor housing.

[0024] Furthermore, the motor also includes a stator assembly arranged in the motor housing, the stator assembly includes a stator core and a stator winding, and when the sealing structure includes a sleeve, the sleeve extends to the end face of the stator core.

[0025] Furthermore, the stator winding includes an end winding, the sleeve is located between the end winding and the housing, and the gap x between the end winding and the sleeve is 0≤x≤0.5 mm.

[0026] By applying the technical solution of the present invention, by controlling the relationship between the expansion coefficient and size of the end cap, the sealing structure, and the threaded connector, the sealing gasket of the sealing structure can effectively compensate for the sealing gap that may be caused by the different expansion amounts of the threaded connector and the end cap during temperature changes, thereby ensuring the sealing effect between the end cap and the housing. During motor operation, as the temperature rises, the sealing gasket expands at the expansion coefficient k. This expansion can compensate for the thermal expansion of the threaded connector and the end cap, ensuring that the contact pressure between the sealing gasket, the housing, and the end cap is maintained or increased, thereby maintaining or even enhancing the sealing performance of the motor housing, effectively preventing moisture intrusion and keeping the interior clean. At the same time, by precisely controlling the expansion amount of each component, structural loosening or damage caused by thermal expansion and contraction is avoided, ensuring that the motor can operate stably under various environmental conditions and achieving efficient waterproofing and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 A schematic structural diagram of a sealing structure according to an embodiment of the present invention is shown;

[0029] Figure 2 A schematic cross-sectional view of a sealing structure according to an embodiment of the present invention is shown;

[0030] Figure 3 A schematic diagram showing the assembly structure of the housing and the end cover of an embodiment of the present invention is shown;

[0031] Figure 4 The figure shows the assembly structure of the stator core, housing, end cover and sealing structure of the embodiment of the present invention.

[0032] The above drawings include the following reference numerals:

[0033] 1. Casing; 2. Threaded connection hole; 3. End cover; 4. Polished hole; 5. Sealing structure; 6. Sealing gasket; 7. Through hole; 8. Threaded connection; 9. Polished rod section; 10. Screw section; 11. Sleeve; 12. Stop structure; 13. Stator core; 14. End winding. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, the motor housing includes: a casing 1, which is provided with a threaded connection hole 2; an end cover 3, which is provided at the end of the casing 1, and a light hole 4 is provided on the end cover 3 corresponding to the threaded connection hole 2, the length of the light hole 4 is h1, and the expansion coefficient of the end cover 3 is k1; a sealing structure 5, which includes a sealing gasket 6, which is provided between the casing 1 and the end cover 3, and a through hole 7 is opened on the sealing gasket 6, the thickness of the sealing gasket 6 is h2, and the expansion coefficient is k3; a threaded connector 8, which includes a polished rod segment 9 and a screw segment 10, the polished rod segment 9 is passed through the light hole 4 and the through hole 7, and the screw segment 10 is installed in the threaded connection hole 2, and the expansion coefficient of the threaded connector 8 is k2; wherein, k3×h2≥k2×(h1+h2)-k1×h1.

[0036] In this embodiment, by controlling the relationship between the expansion coefficients and dimensions of the end cap 3, the sealing structure 5, and the threaded connector 8, the sealing gasket 6 of the sealing structure 5 can effectively compensate for the sealing gap that may be caused by the different expansion amounts of the threaded connector 8 and the end cap 3 during temperature changes, thereby ensuring the sealing effect between the end cap 3 and the housing 1. During motor operation, as the temperature rises, the sealing gasket 6 expands at an expansion coefficient k3. This expansion can compensate for the thermal expansion of the threaded connector 8 and the end cap 3, ensuring that the contact pressure between the sealing gasket 6 and the housing 1 and the end cap 3 is maintained or increased, thereby maintaining or even enhancing the sealing performance of the motor housing, effectively preventing moisture intrusion and keeping the interior clean. At the same time, by precisely controlling the expansion amount of each component, structural loosening or damage caused by thermal expansion and contraction is avoided, ensuring that the motor can operate stably under various environmental conditions and achieving efficient waterproofing and durability.

[0037] In one embodiment, k3>k1, k3>k2.

[0038] The above definition ensures that the expansion coefficient of gasket 6 is higher than that of end cap 3 and threaded connector 8. As a result, gasket 6 can expand more fully during motor operation, forming a tighter seal. This higher expansion coefficient allows gasket 6 to experience greater thermal expansion. When the motor temperature rises, the expansion of gasket 6 exceeds the difference in expansion between end cap 3 and threaded connector 8, ensuring close contact between the sealing surfaces. This enhances the motor's waterproof performance and keeps the motor interior dry and clean even under extreme temperature conditions.

[0039] In one embodiment, 1 mm ≤ h2 ≤ 2 mm.

[0040] This embodiment limits the thickness range of the sealing gasket 6 to ensure that when the motor is running, the sealing gasket 6 can generate sufficient expansion to compensate for the expansion of other components, while avoiding structural damage caused by excessive expansion. The thickness of the sealing gasket 6 directly affects the sealing effect after its expansion. A reasonable thickness range can balance the sealing performance and structural stability. Through the above-mentioned size limitation, when the motor is running, it can not only utilize the expansion of the sealing gasket 6 to ensure the sealing effect, but also will not cause excessive pressure on other components, thereby extending the service life of the motor. In other embodiments, the sealing effect and overall structural design of the motor can also be optimized by adjusting the specific value of h2.

[0041] In this embodiment, the portion where the end cap 3 mates with the polished rod segment 9 of the threaded connector 8 forms a light hole 4, which axially extends through the end cap 3. The portion where the housing 1 mates with the screw segment 10 of the threaded connector 8 forms a threaded connection hole 2. The length of the light hole 4 in the end cap 3 is h1, and the thickness of the sealing gasket 6 of the sealing structure 5 is h2. Because the screw segment 10 of the threaded connector 8 mates with the housing 1 through a threaded fit, the screw segment 10 hardly expands when the motor's operating temperature rises. However, because the polished rod segment 9 of the threaded connector 8 and the light hole 4 in the end cap 3 form a clearance fit, the polished rod segment 9 in the upper half of the threaded connector 8 will expand due to heat. The length of this expanded portion of the polished rod segment 9 is h1 + h2.

[0042] Assume that the expansion coefficient of the end cap 3 is k1, the expansion coefficient of the threaded connector 8 is k2, and the expansion coefficient of the protective structure is k3. The normal temperature of the motor in its non-operating state is T, generally 23 ± 2°C. The normal operating temperature of the motor is T1. The temperature rise from normal temperature T to the normal operating temperature T1 is ΔT1 = T1 - T. Therefore, the expansion of the polished rod section 9 of the threaded connector 8 is k2 × (h1 + h2) × ΔT1; the expansion of the end cap 3 is k1 × h1 × ΔT1; and the expansion of the gasket 6 of the sealing structure 5 is k3 × h2 × ΔT1. The thickness of h2 is related to the expansion of the threaded connector 8 and the end cap 3. It is necessary to ensure that the expansion of the gasket 6 of the sealing structure 5 is greater than the difference between the expansion of the polished rod section 9 of the threaded connector 8 and the expansion of the end cap 3. This way, the expansion of the sealing structure 5 can compensate for the expansion difference between the end cap 3 and the threaded connector 8, ensuring a tight seal between the housing 1 and the end cap 3. Therefore, the structural design of the sealing structure 5 needs to satisfy k3×h2×△T1≥k2×(h1+h2)×△T1-k1×h1×△T1. Eliminating the common factor △T1 in the formula, the formula k3×h2≥k2×(h1+h2)-k1×h1 is obtained.

[0043] When the expansion of the polished rod section 9 is greater than the expansion of the end cover 3, the outward expansion amplitude of the polished rod section 9 is greater than the amplitude of the end cover 3. If the thickness of the sealing gasket 6 remains unchanged, the length of the polished rod section 9 is greater than the sum of the thickness of the sealing gasket 6 and the thickness of the end cover 3. This will cause the end cover 3 to have a movable margin, and the threaded connection 8 cannot effectively seal the end cover 3 and the casing 1. At this time, it is only necessary to ensure that the sealing gasket 6 also expands, and the expansion amount is greater than the difference between the expansion amount of the polished rod section 9 and the expansion amount of the end cover 3. This can make up for the gap caused by the different expansion amounts of the polished rod section 9 and the end cover 3, thereby ensuring the sealing effect between the end cover 3 and the casing 1.

[0044] When the expansion of the polished rod section 9 is less than or equal to the expansion of the end cover 3, the outward expansion amplitude of the polished rod section 9 is smaller than that of the end cover 3. At this time, even if the thickness of the sealing gasket 6 remains unchanged, since the expansion amplitude of the polished rod section 9 is smaller than that of the end cover 3, under the limiting action of the bolt head of the polished rod section 9, the expanded part of the end cover 3 is squeezed toward the sealing gasket 6, thereby ensuring the sealing effect between the casing 1 and the end cover 3. At this time, even if the sealing gasket 6 does not expand, the sealing effect can be guaranteed. The expansion of the sealing gasket 6 can further ensure the sealing effect between the casing 1 and the end cover 3.

[0045] In one embodiment, the sealing structure 5 further includes a sleeve 11 , which is an insulating structure. The sleeve 11 is located on the inner circumference of the sealing gasket 6 and extends axially from the end face of the sealing gasket 6 . The sleeve 11 is sleeved on the inner circumferential wall of the casing 1 .

[0046] When the motor is working, as the temperature rises, the sleeve 11 in the sealing structure 5 uses its insulation and thermal expansion characteristics to radially expand from the inner peripheral side of the sealing gasket 6 and fit tightly on the inner peripheral wall of the casing 1, further forming a seal from the axial direction of the casing 1, which not only enhances the sealing between the casing 1 and the end cover 3 and prevents the intrusion of moisture and condensed water, but also due to the insulating effect of the sleeve 11, effectively maintains the insulation distance between the coil and the casing 1. At the same time, through the good thermal contact between the sleeve 11 and the casing 1, the conduction and heat dissipation of the internal heat of the motor are promoted, thereby improving the sealing performance and insulation safety of the motor while also enhancing the heat dissipation effect and overall lightweight design of the motor, ensuring that the motor can still operate stably under harsh conditions such as high load and high temperature, and improving the reliability and efficiency of the motor.

[0047] In one embodiment, the sealing structure 5 includes a sealing gasket 6 and a sleeve 11, wherein the sealing gasket 6 is a square structure with a circular hole in the middle, the outer contour of the sealing gasket 6 matches the outer contour of the casing 1 and the end cover 3, and the inner diameter of the middle circular hole structure is consistent with the inner diameter of the sleeve 11, so that the inner wall of the middle circular hole of the sealing gasket 6 is flush with the inner wall of the sleeve 11.

[0048] In one embodiment, an iron core installation position is provided in the housing 1 , and the sleeve 11 extends to the iron core installation position.

[0049] In this embodiment, the length h4 of the sleeve 11 is related to the size of the stator core entering the housing. The sleeve 11 is directly flush with the end face of the stator core, so that the sleeve 11 can form good insulation performance between the housing 1 and the stator winding. The outer diameter of the stator winding coil can be infinitely close to the inner diameter R4 of the sleeve 11. It is arranged to contact the inner wall of the sleeve 11, so that the radial dimension of the stator winding coil is as large as possible. In this way, the overall height of the coil can be reduced, reducing the overall axial dimension of the motor and achieving a lightweight motor design. Moreover, because the motor coil is almost in contact with the inner wall of the sleeve 11, the heat of the coil can be transferred to the housing 1 through the sealing structure 5 for heat dissipation. This is conductive heat dissipation, and the heat dissipation effect is better than the radiation conduction heat dissipation of air.

[0050] In one embodiment, the end cover 3 is provided with a stop structure 12 , the stop structure 12 extends into the casing 1 , and the sleeve 11 is located between the outer peripheral wall of the stop structure 12 and the inner peripheral wall of the casing 1 .

[0051] This embodiment further enhances the sealing performance of the motor by providing a stopper structure 12 on the end cap 3 to form a tight fit with the housing 1. The gap between the stopper structure 12 and the housing 1 is filled by the sleeve 11, which utilizes the thermal expansion characteristics of the sleeve 11 to achieve a seal, effectively preventing moisture and dust from entering the motor interior and improving the motor's protection level. In other embodiments, the design of the stopper structure 12 can be optimized to further improve the motor's sealing performance and address the issue of protecting the motor in harsh environments.

[0052] In one embodiment, the outer diameter of the sleeve 11 is R1, the inner diameter is R4, the inner diameter of the housing 1 is R2, the stopper structure 12 is cylindrical, and the outer diameter of the stopper structure 12 is R3. k1×R3×ΔT1+ΔL1≤k3×R4×ΔT1≤k1×R3×ΔT1+ΔL1+ΔL2, where ΔT1 is the temperature rise, ΔT1=T1-T, T1 is the current operating temperature of the housing 1, T is room temperature, ΔL1 has a value range of 0-0.09mm, and ΔL2 has a value range of 0.002mm~0.067mm. ΔL1 is the clearance, and ΔL2 is the interference.

[0053] Assume that the outer diameter of the sleeve 11 is R1 and the inner diameter is R4. The aperture of the casing 1 is R2, and the outer diameter of the stop structure 12 of the end cover 3 is R3. In terms of basic dimensions, R1=R2, R3=R4. This embodiment mainly controls the fit between the end cover 3 and the casing 1 through tolerance. At room temperature, after the sealing structure 5 is installed, the fit between the end cover 3 and the sealing structure 5 is a small clearance fit, which facilitates the installation of the end cover 3. When the motor is running and heating up, because the expansion coefficient of the sealing structure 5 is greater than the expansion coefficient of the casing 1 and the end cover 3, it is necessary to design the final tolerance of the fit between the stop structure 12 of the end cover 3 and the sealing structure 5 to become an interference fit. This is equivalent to forming a tight fit between the casing 1 and the stop structure 12 of the end cover 3, which can effectively prevent water from entering the motor and prevent condensation water from forming due to the temperature difference between the inside and outside.

[0054] To ensure a small clearance fit between the stop structure 12 of the end cover 3 and the sealing structure 5 during initial installation at room temperature, R1 and R2 are exactly the same size. R3 and R4 are basically the same size. Through tolerance setting, R3 is slightly smaller than the inner diameter R4 of the sleeve 11, and the two are a small clearance fit. Assuming that the thermal expansion coefficient of the housing 1 is k4, the expansion of the inner hole of the housing 1 is R1×k4×△T1, and the expansion of the outer diameter of the sleeve 11 of the sealing structure 5 is k3×R2×△T1. Because k3 is greater than k4, the outer diameter of the sleeve 11 is always in close contact with the inner wall of the housing 1, which can ensure the sealing between the sleeve 11 of the sealing structure 5 and the inner wall of the housing 1. The expansion of the outer wall of the stop structure 12 of the end cover 3 is k1×R3×△T1, and the expansion of the inner hole of the sleeve 11 of the sealing structure 5 is k3×R4×△T1. The gap between the stop structure 12 of the end cover 3 and the sleeve 11 can be set as needed. Assuming that the gap △L1 between the stop structure 12 of the end cover 3 and the sleeve 11 is in the range of n1~n2, the expansion amount that the sleeve 11 needs to compensate is k1×R3×△T1+△L1, which needs to satisfy k3×R4×△T1≥k1×R3×△T1+△L1. Since the expansion amount should not be too large, excessive expansion can easily cause deformation of the stop structure 12. The fit between the casing 1, the sealing structure 5 and the end cover 3 belongs to the basic shaft system, and the interference amount △L2 ranges from n3~n4, which needs to satisfy k3×R4×△T1≤k1×R3×△T1+△L1+△L2.

[0055] In one embodiment, ΔL2 is taken from P7 / h6, R7 / h6, S7 / h6, T7 / h6, and U7 / h6, that is, P7 / h6, R7 / h6, S7 / h6, T7 / h6, and U7 / h6 are between n3 and n4.

[0056] This embodiment ensures an interference fit between sleeve 11 and stopper structure 12 during motor operation by selecting appropriate tolerances. The values ​​of n3 and n4 determine the minimum and maximum interference fits between sleeve 11 and stopper structure 12, thereby ensuring a reliable seal as the motor's temperature rises. These limitations ensure that the motor maintains stable sealing performance even in the face of large temperature fluctuations.

[0057] According to an embodiment of the present invention, the motor includes a motor housing, which is the motor housing described above.

[0058] This embodiment provides a motor incorporating the aforementioned sealing structure 5, achieving a lightweight design and efficient heat dissipation. The motor housing design effectively prevents moisture intrusion during operation while dissipating heat through conduction, thereby increasing the motor's power density. A motor employing this motor housing maintains excellent sealing and insulation during operation while also effectively dissipating heat, thereby improving the motor's efficiency and lifespan.

[0059] In one embodiment, the motor further includes a stator assembly disposed in the motor housing. The stator assembly includes a stator core 13 and a stator winding. When the sealing structure 5 includes a sleeve 11 , the sleeve 11 extends to an end surface of the stator core 13 .

[0060] When the motor generates heat during operation, the sleeve 11 in the sealing structure 5 can effectively extend axially from the inner circumference of the sealing gasket 6 to the end face of the stator core 13 due to its higher thermal expansion coefficient than the casing 1 and the end cover 3. It not only fits tightly against the inner wall of the casing 1, ensuring the sealed isolation of the stator assembly in the motor housing from the external environment and preventing the intrusion of moisture and pollutants, but also the sleeve 11 with an insulating structure can maintain effective insulation between the stator winding and the casing 1 at high temperatures, promote the conduction of heat from the stator winding to the casing 1, and significantly improve the waterproof performance, operational safety and heat dissipation efficiency of the motor, so that the motor can operate stably within a wider operating temperature range.

[0061] In one embodiment, the sealing structure 5 is integrally formed and is made of a material with good insulation performance and high heat resistance, thereby preventing the high temperature under the working state of the motor from affecting the insulation performance of the sealing structure 5.

[0062] In one embodiment, the stator winding includes an end winding 14 , the sleeve 11 is located between the end winding 14 and the housing 1 , and a gap x between the end winding 14 and the sleeve 11 is 0≤x≤0.5 mm.

[0063] During the operation of the motor, as the temperature rises, the sleeve 11 in the sealing structure 5 can be fine-tuned and matched with the end winding 14, and the gap x between the two is between 0 and 0.5 mm. This not only greatly enhances the insulation performance of the motor and ensures high-voltage safety, but also makes full use of the heat conduction between the sleeve 11 and the casing 1 to accelerate the heat dissipation of the end winding 14. At the same time, it avoids the cumbersome construction and potential aging problems of traditional insulation materials, and achieves a perfect balance between lightweight design, efficient heat dissipation and electrical safety of the motor, significantly improving the operating stability and overall performance of the motor.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be practiced in an order other than that illustrated or described herein.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor housing, characterized in that: include: A casing (1), wherein the casing (1) is provided with a threaded connection hole (2); An end cover (3) is provided at the end of the housing (1), a light hole (4) is provided on the end cover (3) corresponding to the threaded connection hole (2), the length of the light hole (4) is h1, and the expansion coefficient of the end cover (3) is k1; A sealing structure (5) comprising a sealing gasket (6), the sealing gasket (6) being arranged between the housing (1) and the end cover (3), the sealing gasket (6) being provided with a through hole (7), the sealing gasket (6) having a thickness of h2 and an expansion coefficient of k3; A threaded connection member (8) comprising a polished rod segment (9) and a screw segment (10), wherein the polished rod segment (9) is inserted into the polished hole (4) and the through hole (7), and the screw segment (10) is installed in the threaded connection hole (2); the expansion coefficient of the threaded connection member (8) is k2; Among them, k3×h2≥k2×(h1+h2)-k1×h1.

2. The motor housing according to claim 1, characterized in that k3>k1, k3>k2.

3. The motor housing according to claim 1, characterized in that 1mm≤h2≤2mm.

4. The motor housing according to claim 1, wherein: The sealing structure (5) further includes a sleeve (11), which is an insulating structure. The sleeve (11) is located on the inner peripheral side of the sealing gasket (6) and extends axially from the end face of the sealing gasket (6). The sleeve (11) is sleeved on the inner peripheral wall of the housing (1).

5. The motor housing according to claim 4, characterized in that An iron core installation position is provided in the casing (1), and the sleeve (11) extends to the iron core installation position.

6. The motor housing according to claim 4, characterized in that The end cover (3) is provided with a stop structure (12), the stop structure (12) extends into the housing (1), and the sleeve (11) is located between the outer peripheral wall of the stop structure (12) and the inner peripheral wall of the housing (1).

7. The motor housing according to claim 6, characterized in that The outer diameter of the sleeve (11) is R1, the inner diameter is R4, the inner diameter of the housing (1) is R2, the outer diameter of the stop structure (12) is R3, k1×R3×△T1+△L1≤k3×R4×△T1≤k1×R3×△T1+△L1+△L2, wherein △T1 is the temperature rise, △T1=T1-T, T1 is the current working temperature of the housing (1), T is the normal temperature, the value range of △L1 is 0-0.09mm, and the value range of △L2 is 0.002mm~0.067mm.

8. The motor housing according to claim 7, characterized in that △L2 takes values ​​from P7 / h6, R7 / h6, S7 / h6, T7 / h6, and U7 / h6.

9. A motor, comprising a motor housing, characterized in that: The motor housing is the motor housing according to any one of claims 1 to 8.

10. The motor according to claim 9, characterized in that The motor further comprises a stator assembly arranged in the motor housing, the stator assembly comprising a stator core (13) and a stator winding, and when the sealing structure (5) comprises a sleeve (11), the sleeve (11) extends to the end surface of the stator core (13).

11. The motor according to claim 10, characterized in that The stator winding comprises an end winding (14), the sleeve (11) is located between the end winding (14) and the housing (1), and a gap x between the end winding (14) and the sleeve (11) is 0≤x≤0.5 mm.

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