motor

Abstract

This utility model discloses an electric motor, comprising: a housing with an installation cavity formed therein and a support hole communicating with the installation cavity; a rotor assembly and a bearing, the rotor assembly including a rotor and a shaft, the shaft having a constant diameter section, the rotor and the bearing both being fitted onto the constant diameter section, the rotor being disposed in the installation cavity, the shaft being supported in the support hole by the bearing, and one end of the shaft extending out of the installation cavity through the support hole; and a bushing fitted onto the constant diameter section and located between the bearing and the rotor, the bushing being adapted to abut against the bearing and the rotor to prevent relative displacement of the bearing and the rotor in the axial direction. According to this utility model, the electric motor, while achieving limiting and positioning of the bearing and the rotor, can reduce the amount of material removed from the surface during the shaft machining process. On the one hand, this reduces the manufacturing difficulty and cost of the motor; on the other hand, less removal of high-performance parts after surface heat treatment can improve the performance parameters of the shaft.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor. Background Technology

[0002] The shaft is an important component inside the motor, undertaking important functions such as transmission and load bearing. In the motor, some components are assembled on the shaft. The structure of the shaft is adapted to the arrangement of the components on the shaft. In related technologies, the positioning and limiting of the bearing is achieved by making the shaft into a stepped shaft. The production of the shaft is difficult and the production cost is high. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a motor that can reduce production difficulty and production costs.

[0004] The motor according to this utility model includes: a housing, wherein a mounting cavity is formed inside the housing, and a support hole communicating with the mounting cavity is formed on the housing; a rotor assembly and a bearing, wherein the rotor assembly includes a rotor and a shaft, the shaft having a constant diameter section, the rotor and the bearing being sleeved on the constant diameter section, the rotor being disposed in the mounting cavity, the shaft being supported in the support hole by the bearing, and one end of the shaft extending out of the mounting cavity through the support hole; and a bushing, wherein the bushing is sleeved on the constant diameter section and located between the bearing and the rotor, the bushing being adapted to abut against the bearing and the rotor to prevent relative displacement of the bearing and the rotor in the axial direction.

[0005] According to the present invention, the motor is designed by fitting the rotor, bearing and bushing into the equal diameter section of the shaft, and by using the bushing to limit the relative displacement between the bearing and the rotor. Under the premise of limiting and positioning the bearing and the rotor, the amount of material removed from the surface during the shaft processing can be reduced. On the one hand, this can reduce the production difficulty and cost of the motor. On the other hand, less material is removed after surface heat treatment, which can improve the performance parameters of the shaft.

[0006] According to some embodiments of the present invention, the motor further includes: blades, which are disposed on the outer peripheral wall of the bushing.

[0007] According to some embodiments of the present invention, the motor further includes: a stator assembly, the stator assembly being disposed radially outside the rotor assembly, the stator assembly including a stator coil, the blades being disposed radially inside the stator coils, and at least a portion of the blades being radially opposite to the stator coils on the rotating shaft.

[0008] According to some embodiments of the present invention, there are multiple blades, and the multiple blades are arranged at intervals in the circumferential direction of the bushing.

[0009] According to some embodiments of the present invention, a vent hole is formed on the end face of the rotor, extending axially through the rotor.

[0010] According to some embodiments of the present invention, there are multiple vent holes, and the multiple vent holes are arranged at intervals around the axis of the rotor in the circumferential direction of the rotor.

[0011] According to some embodiments of the present invention, the rotor includes: a rotor core and a pressure plate, wherein the pressure plate is provided at both ends of the rotor core in the axial direction, and the bushing is adapted to abut against the bearing and the pressure plate.

[0012] According to some embodiments of this utility model, the bushing and the pressure plate are an integral piece.

[0013] According to some embodiments of the present invention, the rotor core includes multiple core units, which are arranged sequentially along the axial direction of the rotating shaft.

[0014] According to some embodiments of the present invention, the housing includes: a housing body and an end cap, the housing body forming an open mounting cavity, the end cap covering the opening of the mounting cavity, and the support hole formed on the end cap.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a partial structural cross-sectional view of the motor according to an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of a motor without a housing and stator assembly according to an embodiment of the present invention.

[0018] Figure label:

[0019] 10. Housing; 11. Mounting cavity; 12. Support hole; 13. Housing body; 14. End cap;

[0020] 20. Rotor assembly; 21. Rotor; 211. Vent hole; 212. Rotor core; 2121. Core unit; 213. Pressure plate; 22. Shaft; 221. Equal diameter section;

[0021] 30. Bearings;

[0022] 40. Bushing; 41. Blade;

[0023] 50. Stator assembly; 51. Stator coil; 52. Stator core. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0025] The following is for reference. Figure 1 and Figure 2 A motor according to an embodiment of the present utility model is described.

[0026] like Figure 1 and Figure 2 As shown, the motor according to an embodiment of the present invention includes: a housing 10, a rotor assembly 20, a bearing 30, and a bushing 40.

[0027] Specifically, a mounting cavity 11 is formed inside the housing 10, and a support hole 12 communicating with the mounting cavity 11 is formed on the housing 10. The rotor assembly 20 includes a rotor 21 and a shaft 22. The shaft 22 has a constant diameter section 221. The rotor 21 and the bearing 30 are both sleeved on the constant diameter section 221. The rotor 21 is located in the mounting cavity 11. The shaft 22 is supported in the support hole 12 by the bearing 30, and one end of the shaft 22 extends out of the mounting cavity 11 through the support hole 12. A bushing 40 is sleeved on the constant diameter section 221 and located between the bearing 30 and the rotor 21. The bushing 40 is adapted to abut against the bearing 30 and the rotor 21 to prevent relative displacement of the bearing 30 and the rotor 21 in the axial direction.

[0028] Among them, the inner rings of the bushing 40, rotor 21 and bearing 30 are all fixedly connected to the equal diameter section 221.

[0029] During motor assembly, bearing 30, bushing 40, and rotor 21 are sequentially fitted onto the equal-diameter section 221 of shaft 22. After rotor 21 is installed in the mounting cavity 11, bushing 40 abuts against bearing 30 and rotor 21, thereby positioning and limiting bearing 30. During motor operation, bushing 40 abuts against bearing 30 and rotor 21, preventing relative displacement between them. This achieves the positioning and limiting requirements between bearing 30 and rotor 21.

[0030] Understandably, during the production of the shaft 22, the surface of the raw material for the shaft 22 needs to be machined to ensure that the outer diameter and outer surface of the shaft 22 meet the requirements of the motor operation. In related technologies, the bearing 30 is limited by the stepped shaft stage. During the machining of the shaft, the outer diameter of the raw material needs to be larger than the maximum outer diameter of the stepped shaft. A large amount of material is removed at the minimum outer diameter, which makes the production of the shaft 22 more difficult, results in low material utilization, and high production costs.

[0031] By mounting the bearing 30, bushing 40, and rotor 21 onto the equal-diameter section 221 of the rotating shaft 22, the outer diameter of the equal-diameter section 221 is the same along the axial direction of the rotating shaft 22, resulting in less material to be removed from the surface of the raw material. This reduces the difficulty of machining the rotating shaft 22 and minimizes material waste during the machining process.

[0032] Furthermore, it will be understood by those skilled in the art that the shaft 22 needs to be heat-treated before turning. Due to the process characteristics of heat treatment, the material properties of the outer part of the shaft 22 are better after heat treatment in the radial direction. In this embodiment, less material needs to be removed from the surface of the raw material. Thus, more of the outer part of the shaft 22 with better material properties is retained, which can make the material properties of the shaft 22 even better.

[0033] According to the embodiment of the present invention, the motor is designed by fitting the rotor 21, bearing 30 and bushing 40 onto the equal diameter section 221 of the rotating shaft 22, and by using the bushing 40 to limit the relative displacement between the bearing 30 and the rotor 21. Under the premise of limiting and positioning the bearing 30 and the rotor 21, the amount of material removed from the surface of the rotating shaft 22 during the machining process can be reduced. On the one hand, this can reduce the production difficulty and cost of the motor. On the other hand, since less of the high-performance part is removed after surface heat treatment, the performance parameters of the rotating shaft 22 can be improved.

[0034] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the motor also includes: blade 41, which is disposed on the outer peripheral wall of the bushing 40.

[0035] During the operation of the motor, heat is generated inside the motor, causing the motor temperature to rise. In this embodiment, blades 41 are provided on the outer peripheral wall of the bushing 40. During the operation of the motor, the rotating shaft 22 drives the bushing 40 to rotate, causing the blades 41 to rotate. In this way, the blades 41 can generate airflow in the mounting cavity 11, thereby improving the cooling efficiency of the motor and thus improving the reliability of the motor during operation.

[0036] In some embodiments of this utility model, such as Figure 1As shown, the motor also includes a stator assembly 50, which is located radially outside the rotor assembly 20. The stator assembly 50 includes a stator coil 51 and blades 41 are located radially inside the stator coil 51. At least a portion of the blades 41 and the stator coil 51 are radially opposite to each other on the rotating shaft 22.

[0037] In other words, either a portion of the blade 41 is opposite the stator coil 51 in the radial direction of the rotating shaft 22, or the entire blade 41 is opposite the stator coil 51 in the radial direction of the rotating shaft 22.

[0038] The stator coil 51 is fixed on the stator core 52. As those skilled in the art will understand, the stator coil 51 generates a relatively high proportion of heat during motor operation, and since the stator coil 51 does not move relative to the housing 10, its heat dissipation efficiency is low. By having at least a portion of the blades 41 and the stator coil 51 radially opposite each other on the rotating shaft 22, the airflow generated by the blades 41 can better sweep across the stator coil 51, thereby improving the cooling efficiency of the stator coil 51 and further improving the reliability of the motor during operation.

[0039] In some embodiments of this utility model, such as Figure 2 As shown, there are multiple blades 41, which are arranged at intervals around the bushing 40.

[0040] For example, there can be two, three, four, or eight blades 41, which increases the airflow generated by the blades 41 and thus improves the heat dissipation efficiency of the motor. During the product design process, the number, size, and structure of the blades 41 can be adjusted to meet more product design needs.

[0041] In some embodiments of this utility model, such as Figure 2 As shown, a vent 211 is formed on the end face of the rotor 21, extending axially through the rotor 21.

[0042] During the operation of the motor, the rotation of the blades 41 generates airflow in the mounting cavity 11. The airflow flows along the vent 211, which increases the heat exchange efficiency between the rotor 21 and the air in the mounting cavity 11, thereby improving the cooling efficiency of the rotor 21.

[0043] In some embodiments of this utility model, such as Figure 2 As shown, there are multiple vent holes 211, which are arranged at intervals around the axis of the rotor 21 in the circumferential direction of the rotor 21.

[0044] For example, there can be two, four or eight vent holes 211, so that airflow can flow in each vent hole 211. On the one hand, this can improve the cooling efficiency of the rotor 21, and on the other hand, it can make the cooling of the rotor 21 more uniform.

[0045] In some embodiments of this utility model, the rotor 21 includes a rotor core 212 and a pressure plate 213. The rotor core 212 is provided with pressure plates 213 at both ends in the axial direction, and the bushing 40 is adapted to abut between the bearing 30 and the pressure plate 213.

[0046] The vent 211 passes through the rotor core 212 and the pressure plate 213 in the axial direction of the rotor 21. As those skilled in the art will understand, the material of the pressure plate 213 is different from that of the rotor core 212, and the material density of the pressure plate 213 is less than that of the rotor core 212. By setting the pressure plate 213, the size of the pressure plate 213 can be reasonably designed to achieve the dynamic balance of the rotor 21. In addition, the pressure plate 213 can block between the bushing 40 and the rotor 21, reducing the probability of damage to the rotor core 212 during operation, thereby further improving the reliability of the motor during operation.

[0047] In some embodiments of this utility model, the bushing 40 and the pressure plate 213 are an integral piece.

[0048] Therefore, on the one hand, during the assembly process, the bushing 40 and the pressure plate 213 can be fitted together on the equal diameter section 221, with fewer positioning and installation steps, which can reduce the assembly difficulty. On the other hand, during the operation of the motor, there will be no relative displacement or impact between the pressure plate 213 and the bushing 40, which can make the motor work more smoothly and reduce the noise generated during the operation of the motor.

[0049] In some embodiments of this utility model, such as Figure 2 As shown, the rotor core 212 includes multiple core units 2121, which are arranged sequentially along the axial direction of the rotating shaft 22.

[0050] For example, there can be two, three or four iron core units 2121. Thus, on the one hand, the size of a single iron core unit 2121 will not be too large during the assembly process, which facilitates assembly. On the other hand, during the operation of the motor, the eddy current loss in the rotor iron core 212 can be reduced.

[0051] In some embodiments of this utility model, such as Figure 1 As shown, the housing 10 includes a housing body 13 and an end cap 14. The housing body 13 forms a mounting cavity 11 with one end open. The end cap 14 covers the opening of the mounting cavity 11, and a support hole 12 is formed on the end cap 14.

[0052] During the assembly process, the rotor assembly 20 is first assembled into the mounting cavity 11 through the opening of the mounting cavity 11, and then the end cover 14 is placed over the opening of the mounting cavity 11, and the bearing 30 is installed into the support hole 12 on the end cover 14. Thus, during the assembly process, the housing 10 can avoid the components in the mounting cavity 11, thereby realizing the assembly of the motor.

[0053] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0054] 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 one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "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 communication connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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 invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric motor, characterized in that, include: A housing (10) having an installation cavity (11) formed therein, and a support hole (12) communicating with the installation cavity (11) formed on the housing (10); The rotor assembly (20) includes a rotor (21) and a shaft (22). The shaft (22) has a constant diameter section (221). The rotor (21) and the bearing (30) are both sleeved on the constant diameter section (221). The rotor (21) is located in the mounting cavity (11). The shaft (22) is supported in the support hole (12) by the bearing (30), and one end of the shaft (22) extends out of the mounting cavity (11) through the support hole (12). A bushing (40) is fitted on the equal diameter section (221) and located between the bearing (30) and the rotor (21). The bushing (40) is adapted to abut against the bearing (30) and the rotor (21) to prevent relative displacement of the bearing (30) and the rotor (21) in the axial direction.

2. The motor according to claim 1, characterized in that, The motor further includes a blade (41), which is disposed on the outer peripheral wall of the bushing (40).

3. The motor according to claim 2, characterized in that, The motor further includes a stator assembly (50) located radially outside the rotor assembly (20), the stator assembly (50) including a stator coil (51), a blade (41) located radially inside the stator coil (51), and at least a portion of the blade (41) and the stator coil (51) being radially opposite to each other on the shaft (22).

4. The motor according to claim 2, characterized in that, There are multiple blades (41), and the multiple blades (41) are arranged at intervals in the circumferential direction of the bushing (40).

5. The motor according to claim 2, characterized in that, A vent hole (211) is formed on the end face of the rotor (21) and extends through the rotor (21) axially.

6. The motor according to claim 5, characterized in that, There are multiple vent holes (211), and the multiple vent holes (211) are arranged at intervals around the axis of the rotor (21) in the circumferential direction of the rotor (21).

7. The motor according to claim 1, characterized in that, The rotor (21) includes a rotor core (212) and a pressure plate (213). The rotor core (212) is provided with the pressure plate (213) at both ends in the axial direction. The bushing (40) is adapted to abut between the bearing (30) and the pressure plate (213).

8. The motor according to claim 7, characterized in that, The bushing (40) and the pressure plate (213) are an integral piece.

9. The motor according to claim 7, characterized in that, The rotor core (212) includes multiple core units (2121), which are arranged sequentially along the axial direction of the rotating shaft (22).

10. The motor according to claim 1, characterized in that, The housing (10) includes a housing body (13) and an end cap (14). The housing body (13) forms an open mounting cavity (11). The end cap (14) covers the opening of the mounting cavity (11). The support hole (12) is formed on the end cap (14).

Images