Motor housing and motor
By designing the mounting cavity structure of the motor housing, the friction between the stator and the housing during thermal assembly is avoided, thus solving the problem of reduced manufacturing yield caused by increased interference fit between the stator and the housing, and achieving efficient assembly and high yield of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAOMI EV TECH CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-07-03
Smart Images
Figure CN224459454U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of motor technology, specifically to a motor housing and a motor. Background Technology
[0002] To meet the demands of high-speed motor development, the interference fit between the stator and the housing is becoming increasingly larger. However, this increased interference fit can lead to friction and debris buildup during thermal assembly, thus reducing manufacturing yield. Utility Model Content
[0003] This disclosure aims to at least partially address one of the technical problems in the related art. To this end, embodiments of this disclosure propose an electric motor housing that can prevent scratches during the thermal assembly of the stator and housing, thereby improving manufacturing yield.
[0004] This disclosure also proposes an electric motor.
[0005] The motor housing of this disclosure includes a housing body having a mounting cavity, one end of which is open to form an opening. The mounting cavity includes a first cavity segment and a second cavity segment. The cross-sectional area of the first cavity segment is larger than that of the second cavity segment, and the opening is formed at the end of the first cavity segment away from the second cavity segment.
[0006] The motor housing of this disclosure increases the gap between the outer peripheral surface of the stator end and the inner wall surface of the housing body by setting the cross-sectional area of the first cavity segment to be larger than that of the second cavity segment, and forming an opening at the end of the first cavity segment away from the second cavity segment. This avoids the stator from rubbing against the inner wall surface of the housing body when it enters the mounting cavity through the opening, thereby improving the manufacturing yield.
[0007] In some embodiments, the mounting cavity further includes a connecting cavity segment connected between the first cavity segment and the second cavity segment, wherein the cross-sectional area of the connecting cavity segment is smaller than the cross-sectional area of the first cavity segment and larger than the cross-sectional area of the second cavity segment.
[0008] In some embodiments, the connecting cavity segment includes a first connecting cavity segment and a second connecting cavity segment, wherein the first connecting cavity segment is connected between the first cavity segment and the second connecting cavity segment, and the second connecting cavity segment is connected between the first connecting cavity segment and the second connecting cavity segment.
[0009] In some embodiments, the peripheral wall of the first connecting cavity segment is arc-shaped.
[0010] In some embodiments, the peripheral wall of the second connecting cavity is an inclined plane and the cross-sectional area of the second connecting cavity gradually decreases along the direction toward the second cavity.
[0011] In some embodiments, the fillet radius of the first connecting cavity is 0.2mm-0.4mm.
[0012] In some embodiments, the difference between the radius of the first cavity segment and the radius of the second cavity segment is D, where 0.5mm≤D≤0.8mm.
[0013] In some embodiments, one end of the mounting cavity is provided with a chamfer.
[0014] In some embodiments, the chamfer has a size of 0.1mm-0.5mm.
[0015] The motor of this disclosure includes the motor housing and stator described in the above embodiments, wherein the stator is fitted within the mounting cavity.
[0016] The motor of this embodiment includes the motor housing of the above embodiment, which avoids rubbing between the stator and the motor housing during thermal assembly, thereby improving the manufacturing yield of the motor. Attached Figure Description
[0017] Figure 1 This is a perspective view of the motor housing according to an embodiment of the present disclosure.
[0018] Figure 2 This is a cross-sectional view of the motor housing according to an embodiment of this disclosure.
[0019] Figure 3 yes Figure 2 An enlarged diagram of point A in the diagram.
[0020] Figure 4 yes Figure 2 An enlarged diagram of point B in the diagram.
[0021] Figure label:
[0022] Shell body 1, mounting cavity 11, first cavity segment 111, second cavity segment 112, connecting cavity segment 113, first connecting cavity segment 1131, second connecting cavity segment 1132, chamfer 114.
[0023] Opening 12. Detailed Implementation
[0024] Embodiments of this disclosure are described in detail below, with examples of these embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting it.
[0025] The following is in conjunction with the appendix Figures 1-4 The motor housing of the present disclosure will be described in detail.
[0026] The motor housing of this embodiment includes a housing body 1, the housing body 1 having a mounting cavity 11, one end of the mounting cavity 11 being open to form an opening 12, the mounting cavity 11 including a first cavity segment 111 and a second cavity segment 112, the cross-sectional area of the first cavity segment 111 being larger than the cross-sectional area of the second cavity segment 112, and the opening 12 being formed at the end of the first cavity segment 111 away from the second cavity segment 112.
[0027] In the motor housing of this embodiment, by setting the cross-sectional area of the first cavity segment 111 to be larger than that of the second cavity segment 112, and forming an opening 12 at the end of the first cavity segment 111 away from the second cavity segment 112, the gap between the outer peripheral surface of the stator end and the inner wall surface of the housing body 1 is increased, thereby preventing the stator from rubbing against the inner wall surface of the housing body 1 when it enters the mounting cavity 11 through the opening 12, thereby improving the manufacturing yield.
[0028] It should be noted that the motor housing in this embodiment is used in the assembly of oil-cooled flat wire motors. During the thermal assembly of the stator and the housing, the motor housing is heated by an induction heating coil. After the motor housing expands due to heat, the opening 12 of the motor housing is oriented towards the stator and the motor housing is continuously moved to fit the motor housing onto the outer circumference of the stator, thus completing the thermal assembly of the motor housing and the stator.
[0029] The inventors discovered that during the thermal assembly of the motor housing and the stator, the middle section of the stator has the largest cross-sectional area, and its outer peripheral surface is interference-fitted with the peripheral wall of the second cavity section 112 of the housing body 1. As the motor housing moves towards the stator, the middle section of the stator must first pass through the first cavity section 111 to reach and mate with the second cavity section 112. When the middle section passes through the first cavity section 111, its large cross-sectional area makes it most prone to scraping against the first cavity section 111 of the housing body 1. In this embodiment, by setting the cross-sectional area of the first cavity section 111 to be larger than that of the second cavity section 112, the gap between the middle section of the stator and the peripheral wall of the first cavity section 111 when passing through it is increased. This prevents scraping between the middle section of the stator and the first cavity section 111 of the housing body 1, satisfying the large interference fit between the stator and the motor housing while improving manufacturing yield—that is, improving manufacturing yield while maintaining the same motor drive efficiency.
[0030] Specifically, such as Figure 1 and Figure 2 As shown, the upper end of the mounting cavity 11 is open to form an opening 12. The first cavity section 111 is located above the second cavity section 112. The lower end of the first cavity section 111 is connected to the upper end of the second cavity section 112. The upper end of the first cavity section 111 forms an opening 12 to facilitate the thermal fitting of the motor housing and the stator.
[0031] Optionally, the first cavity 111 is an oil ring matching area. After the stator and the motor housing are thermally assembled, an oil ring is installed at the end of the stator, and the oil ring is located between the first cavity 111 and the stator. By setting the cross-sectional area of the first cavity 111 to be larger than the cross-sectional area of the second cavity 112, it is easier to install the oil ring and the assembly difficulty of the motor is reduced.
[0032] Optionally, the vertical dimension of the first cavity segment 111 needs to be determined according to different models of oil rings and stators. In this embodiment, the vertical dimension of the first cavity segment 111 is not limited. For example, the vertical dimension of the first cavity segment 111 is 34mm.
[0033] In some embodiments, the mounting cavity 11 further includes a connecting cavity segment 113, which is connected between the first cavity segment 111 and the second cavity segment 112. The cross-sectional area of the connecting cavity segment 113 is smaller than the cross-sectional area of the first cavity segment 111 and larger than the cross-sectional area of the second cavity segment 112.
[0034] Specifically, such as Figure 3 As shown, the upper end of the connecting cavity 113 is connected to the lower end of the first cavity 111, and the lower end of the connecting cavity 113 is connected to the upper end of the second cavity 112. By setting the connecting cavity 113, the connection between the first cavity 111 and the second cavity 112 is realized. Moreover, by setting the cross-sectional area of the connecting cavity 113 to be smaller than the cross-sectional area of the first cavity 111 and larger than the cross-sectional area of the second cavity 112, it is convenient to guide the stator from the first cavity 111 to the second cavity 112, thereby improving the assembly accuracy and stability while avoiding the stator from rubbing against the housing body 1.
[0035] In some embodiments, the connecting cavity 113 includes a first connecting cavity 1131 and a second connecting cavity 1132, wherein the first connecting cavity 1131 is connected between the first cavity 111 and the second connecting cavity 1132, and the second connecting cavity 1132 is connected between the first connecting cavity 1131 and the second cavity 112.
[0036] Specifically, such as Figure 3 As shown, the upper end of the first connecting cavity 1131 is connected to the lower end of the first cavity 111, the lower end of the first connecting cavity 1131 is connected to the upper end of the second connecting cavity 1132, and the lower end of the second connecting cavity 1132 is connected to the upper end of the second cavity 112. The first connecting cavity 1131 guides the stator to the second connecting cavity 1132, and the second connecting cavity 1132 guides the stator to the second cavity 112. By setting the first connecting cavity 1131 and the second connecting cavity 1132, a better guiding effect can be achieved, further reducing the probability of the stator rubbing against the housing body 1, thereby improving the manufacturing yield.
[0037] In some embodiments, such as Figure 3 As shown, the peripheral wall of the first connecting cavity 1131 is arc-shaped. By setting the peripheral wall of the first connecting cavity 1131 to be arc-shaped, an arc transition is achieved between the first cavity 111 and the second connecting cavity 1132, which facilitates smoother guidance of the stator to the second connecting cavity 1132 while reducing the risk of the stator rubbing against the housing body 1, thereby improving assembly efficiency and manufacturing yield.
[0038] Optionally, the arc shape protrudes towards the mounting cavity 11.
[0039] In some embodiments, the peripheral wall of the second connecting cavity 1132 is an inclined plane and the cross-sectional area of the second connecting cavity 1132 gradually decreases along the direction toward the second cavity 112.
[0040] Specifically, such as Figure 3 As shown, the peripheral wall of the second connecting cavity section 1132 extends from top to bottom and is inclined towards the mounting cavity 11, i.e., inclined towards the inside of the mounting cavity 11. By setting the cross-sectional area of the upper end of the second connecting cavity section 1132 to be larger than the cross-sectional area of the lower end of the second connecting cavity section 1132, it is convenient for the second connecting cavity section 1132 to guide the stator to the second cavity section 112. Moreover, the setting of the inclined plane facilitates the alignment of the stator with the housing body 1, realizes the floating correction function of the stator entering the housing body 1, and improves the assembly accuracy.
[0041] In some embodiments, the fillet radius of the first connecting cavity 1131 is 0.2mm-0.4mm.
[0042] Specifically, when the radius of the first connecting cavity section 1131 is less than 0.2mm, it is difficult to achieve a guiding effect and the processing difficulty is relatively high; when the radius of the first connecting cavity section 1131 is greater than 0.4mm, slippage is likely to occur between the stator and the first connecting cavity section 1131, which is detrimental to the assembly of the stator and the housing body 1. In this embodiment, by limiting the radius of the first connecting cavity section 1131, the stator can be effectively guided to transition smoothly, ensuring that the stator smoothly enters the mounting cavity 11, achieving arc transition guidance while reducing processing difficulty.
[0043] The rounded corner of the first connecting cavity segment 1131 refers to the dimension of the first connecting cavity segment 1131 in the left-right direction. Since the first connecting cavity segment 1131 and the second connecting cavity segment 1132 are located between the first cavity segment 111 and the second cavity segment 112, the cross-sectional areas of the first connecting cavity segment 1131 and the second connecting cavity segment 1132 are both larger than the cross-sectional area of the second cavity segment 112 and smaller than the cross-sectional area of the first cavity segment 111. Furthermore, the peripheral wall of the first connecting cavity segment 1131 is arc-shaped, and the peripheral wall of the second connecting cavity segment 1132 is an inclined plane. The cross-sectional area of the second connecting cavity segment 1132 gradually decreases along the direction towards the second cavity segment 112, such that the sum of the dimensions of the first connecting cavity segment 1131 and the second connecting cavity segment 1132 in the left-right direction is equal to the distance between the first cavity segment 111 and the second cavity segment 112 in the left-right direction.
[0044] For example, the distance between the first cavity segment 111 and the second cavity segment 112 in the left-right direction is 0.6mm, that is, the inner diameter of the first cavity segment 111 is 0.6mm larger than that of the second cavity segment 112. When the radius of the first connecting cavity segment 1131 is 0.2mm, the dimension of the second connecting cavity segment 1132 in the left-right direction is 0.4mm. When the radius of the first connecting cavity segment 1131 is 0.25mm, the dimension of the second connecting cavity segment 1132 in the left-right direction is 0.35mm. When the radius of the first connecting cavity segment 1131 is 0.3mm, the dimension of the second connecting cavity segment 1132 in the left-right direction is 0.3mm. When the radius of the first connecting cavity segment 1131 is 0.4mm, the dimension of the second connecting cavity segment 1132 in the left-right direction is 0.2mm.
[0045] In some embodiments, the difference between the radius of the first cavity segment 111 and the radius of the second cavity segment 112 is D, where 0.5mm ≤ D ≤ 0.8mm. This embodiment limits the range of the difference between the radius of the first cavity segment 111 and the radius of the second cavity segment 112 to avoid the difference being too small, which could easily cause friction during the assembly of the stator and the housing body 1, and to avoid the difference being too large, which could affect the subsequent assembly between the oil ring and the housing body 1. This ensures smooth assembly of the stator and the housing body 1 without friction, improving manufacturing yield.
[0046] For example, the value of D is 0.5mm, 0.6mm, 0.7mm, or 0.8mm. Of course, in some other embodiments, the difference between the radius of the first cavity segment 111 and the radius of the second cavity segment 112 can also be a value outside the above range.
[0047] In some embodiments, such as Figure 1 and Figure 4As shown, one end of the mounting cavity 11 is provided with a chamfer 114. The upper end of the mounting cavity 11 is provided with a chamfer 114 to prevent the stator from rubbing against the housing body 1 when entering the mounting cavity 11.
[0048] In some embodiments, the chamfer 114 has a size of 0.1mm-0.5mm. By limiting the size of the chamfer 114, it is possible to avoid the chamfer 114 being too large, which would result in the wall thickness of the shell body 1 being too thin and affect the installation of the oil passages inside the shell body 1. At the same time, it is possible to avoid the chamfer 114 being too small, which would not only fail to provide a guiding effect but also increase the processing difficulty of the chamfer 114.
[0049] For example, the dimensions of chamfer 114 are 0.1mm, 0.2mm, 0.3mm, 0.4mm, and 0.5mm.
[0050] The motor of this embodiment includes the motor housing and stator of the above embodiments, with the stator fitting within the mounting cavity 11.
[0051] The motor of this disclosure embodiment, by including the motor housing of the above embodiment, can avoid rubbing between the stator and the motor housing during thermal assembly, thereby improving the manufacturing yield of the motor.
[0052] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0054] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0055] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0056] In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0057] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.
Claims
1. A motor housing, characterized in that, The device includes a shell body (1) having a mounting cavity (11) with one end open to form an opening (12). The mounting cavity (11) includes a first cavity segment (111) and a second cavity segment (112). The cross-sectional area of the first cavity segment (111) is larger than the cross-sectional area of the second cavity segment (112), and the opening (12) is formed at the end of the first cavity segment (111) away from the second cavity segment (112).
2. The motor housing of claim 1, wherein, The mounting cavity (11) further includes a connecting cavity segment (113), which is connected between the first cavity segment (111) and the second cavity segment (112). The cross-sectional area of the connecting cavity segment (113) is smaller than that of the first cavity segment (111) and larger than that of the second cavity segment (112).
3. The motor housing of claim 2, wherein, The connecting cavity segment (113) includes a first connecting cavity segment (1131) and a second connecting cavity segment (1132). The first connecting cavity segment (1131) is connected between the first cavity segment (111) and the second connecting cavity segment (1132), and the second connecting cavity segment (1132) is connected between the first connecting cavity segment (1131) and the second cavity segment (112).
4. The motor housing of claim 3, wherein, The peripheral wall of the first connecting cavity segment (1131) is arc-shaped.
5. The motor housing of claim 4, wherein, The peripheral wall of the second connecting cavity (1132) is an inclined plane and the cross-sectional area of the second connecting cavity (1132) gradually decreases along the direction toward the second cavity (112).
6. The motor housing of claim 5, wherein, The fillet radius of the first connecting cavity segment (1131) is 0.2mm-0.4mm.
7. The motor housing of claim 1, wherein, The difference between the radius of the first cavity segment (111) and the radius of the second cavity segment (112) is D, where 0.5mm≤D≤0.8mm.
8. The motor housing of any one of claims 1-7, wherein, One end of the mounting cavity (11) is provided with a chamfer (114).
9. The electric machine housing of claim 8, wherein, The chamfer (114) has a size of 0.1mm-0.5mm.
10. An electric motor, characterized in that, It includes a motor housing and a stator according to any one of claims 1-9, the stator fitting within the mounting cavity (11).