Easily-assembled structure of micro-motor rotor

Abstract

The utility model discloses a micromotor rotor easy assembly structure, which comprises a rotor body, the center of the rotor body is provided with an equal-diameter axial extending shaft hole, and at least one section of outer reaming part with enlarged aperture is arranged between the head end and the tail end of the shaft hole. And the hole diameters of other positions, except the outer reaming part, of the shaft hole are not changed to form an assembly hole part. According to the utility model, the structural design is reasonable, and the outer reaming part with the enlarged aperture is ingeniously arranged in the shaft hole, so that the rotating shaft can be smoothly assembled without bearing overlarge axial thrust in the assembling process, the risk of deformation of the rotating shaft is effectively reduced, the assembling efficiency and quality are improved, and the performance and reliability of the micromotor are ensured. Meanwhile, the outer broaching part is additionally arranged on the premise that the original hole diameter of the assembly hole part is not changed, so that the matching precision and tightness of the rotating shaft and the rotor body are guaranteed, and the effect of easy assembly is achieved. In addition, the whole structure is simple, easy to implement, low in cost and beneficial to wide application.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to an easy-to-assemble structure for a micro motor rotor. Background Technology

[0002] Micro motors, also known as miniature motors, refer to motors with a diameter of less than 160mm or a rated power of less than 750mW.

[0003] Due to their compact size, micromotors inevitably face space constraints in their shaft design, resulting in a small shaft diameter and relatively limited structural strength. During assembly, when the shaft needs to fit into the rotor body, the shaft hole on the rotor body is a constant-diameter axially extending structure, and the total length of the shaft is relatively long. Therefore, the shaft must withstand a significant axial thrust along the shaft hole direction to ensure it is pressed into and assembled into the rotor body's shaft hole. During this assembly process, the small shaft is highly susceptible to deformation, which can affect its normal operation and compromise the quality of the micromotor. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this utility model is to provide a micro motor rotor easy-to-assemble structure with a reasonable structural design, easy assembly, and reduced probability of shaft deformation.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A micro motor rotor easy-assembly structure includes a rotor body, the center of which is provided with a shaft hole of equal diameter extending axially, and at least one section of outwardly enlarged hole with a larger diameter is provided between the two ends of the shaft hole, and the diameter of the shaft hole remains unchanged at other positions except for the outwardly enlarged hole to form an assembly hole.

[0007] In a preferred embodiment of this invention, the number of externally expanded holes is two segments, spaced apart. This allows the shaft to adapt to changes in the shaft hole in stages during assembly, further reducing the axial thrust required for assembly. This not only helps prevent shaft deformation but also improves the assembly stability and reliability of the shaft.

[0008] In a preferred embodiment of this invention, the diameter of the expanded hole is 0.03–0.05 mm larger than the diameter of the assembly hole. This ensures that the expanded hole effectively reduces assembly difficulty, while preventing the excessively large hole diameter from affecting the fit accuracy between the shaft and the rotor body and the overall structural stability.

[0009] As a preferred embodiment of this utility model, the lengths of the assembly hole and the outer expansion hole are approximately equal, making the structure of the entire shaft hole more symmetrical and balanced, and also facilitating the adjustment of the pressing force, improving the stability and uniformity of the assembly, thereby reducing the bending and deformation of the shaft during the pressing process.

[0010] In a preferred embodiment of this invention, the rotor body is composed of several stacked silicon steel sheets, which not only possesses excellent magnetic permeability but also effectively reduces eddy current losses and improves the efficiency of the micromotor. Furthermore, the stacked silicon steel sheet structure facilitates processing and assembly, helping to reduce production costs and improve production efficiency.

[0011] As a preferred embodiment of this utility model, the mounting hole and the outer expansion hole are steppedly enlarged, which facilitates processing and inspection.

[0012] As a preferred embodiment of this utility model, the assembly hole and the outer expansion hole are continuously enlarged, achieving a smooth transition in hole diameter.

[0013] The beneficial effects of this utility model are as follows: The utility model has a reasonable structural design, cleverly incorporating an enlarged outer hole within the shaft hole. This allows the shaft to be assembled smoothly without bearing excessive axial thrust during assembly, effectively reducing the risk of shaft deformation, improving assembly efficiency and quality, and ensuring the performance and reliability of the micro-motor. Furthermore, since the outer hole is added without altering the original assembly hole diameter, it ensures both the precision and tightness of the fit between the shaft and the rotor body, while also achieving easy assembly. In addition, the overall structure is simple, easy to implement, and low in cost, facilitating widespread application.

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0016] Figure 2 This is a three-dimensional sectional view of the present invention.

[0017] Figure 3 yes Figure 2 A magnified schematic diagram of the structure of part A in the middle. Detailed Implementation

[0018] See the example. Figure 1 , Figure 2 and Figure 3A micro-motor rotor assembly structure is disclosed, comprising a rotor body. The rotor body is composed of several stacked silicon steel sheets, which not only possesses excellent magnetic permeability but also effectively reduces eddy current losses and improves the efficiency of the micro-motor. Simultaneously, the stacked silicon steel sheet structure facilitates processing and assembly, helping to reduce production costs and improve production efficiency.

[0019] The rotor body 1 has a shaft hole 11 extending axially with a constant diameter at its center. At least one section of the shaft hole 11 with an enlarged diameter is provided between its two ends. In this embodiment, there are two sections of the enlarged diameter 111, spaced apart. This allows the shaft 2 to adapt to changes in the shaft hole 11 in stages during assembly, further reducing the axial thrust required for assembly. This not only helps prevent deformation of the shaft 2 but also improves the assembly stability and reliability of the shaft 2. In other embodiments, the number of enlarged diameter sections 111 can be three or more. Preferably, the lengths of the assembly hole 2 and the enlarged diameter sections 111 are approximately equal, with a length error ≤1mm. This makes the structure of the entire shaft hole 11 more symmetrical and balanced, and also facilitates adjustment of the pressing thrust, improving the stability and uniformity of the assembly, thereby reducing bending and deformation of the shaft 2 during the pressing process.

[0020] The diameter of the shaft hole 11, except for the expanded hole portion 111, remains unchanged to form the assembly hole portion 112. Specifically, the diameter of the expanded hole portion 111 is 0.03 to 0.05 mm larger than the diameter of the assembly hole portion 112, preferably 0.03 to 0.04 mm. This ensures that the expanded hole portion 111 effectively reduces assembly difficulty, while preventing the excessively large hole diameter from affecting the fitting accuracy and overall structural stability of the rotating shaft 2 and the rotor body 1. The assembly hole portion 112 and the rotating shaft 2 have an interference fit, while the expanded hole portion 111 and the rotating shaft 2 have a clearance fit.

[0021] In this embodiment, the mounting hole 112 and the expanded hole 111 are stepped, facilitating processing and inspection. In actual production, the shaft holes of a portion of the stacked silicon steel sheets are fitted with the rotating shaft 2 via an interference fit to form the mounting hole 112, while the shaft holes of the other stacked silicon steel sheets are slightly larger than the outer diameter of the rotating shaft 2, forming the expanded hole 111. In other embodiments, the mounting hole 112 and the expanded hole 111 can also be continuously enlarged, achieving a smooth transition in the hole diameter.

[0022] During assembly, since the rotor body 1 has an enlarged outer hole 111 in the shaft hole, the shaft 2 can be assembled smoothly without bearing excessive axial thrust, which effectively reduces the risk of shaft deformation, improves assembly efficiency and quality, and ensures the quality of the micro motor.

[0023] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. As described in the above embodiments of this utility model, other rotor structures obtained by using the same or similar structures are all within the protection scope of this utility model.

Claims

1. A micro-motor rotor assembly structure, comprising a rotor body, wherein the rotor body has a shaft hole extending axially with a constant diameter at its center, characterized in that, At least one section with an enlarged diameter is provided between the two ends of the shaft hole, and the diameter of the shaft hole remains unchanged at other positions except for the enlarged diameter section, forming an assembly hole.

2. The micro-motor rotor easy-assembly structure according to claim 1, characterized in that: The number of the externally expanded holes is two, which are spaced apart.

3. The easy-assembly structure of the micro-motor rotor according to claim 1, characterized in that: The diameter of the outer expansion hole is 0.03 to 0.05 mm larger than the diameter of the assembly hole.

4. The easy-assembly structure of the micro-motor rotor according to claim 1, characterized in that: The lengths of the assembly hole and the outer expansion hole are approximately equal.

5. The easy-assembly structure of the micro-motor rotor according to claim 1, characterized in that: The rotor body is composed of several stacked silicon steel sheets.

6. The micro-motor rotor easy-assembly structure according to any one of claims 1-5, characterized in that: The mounting hole and the outer expansion hole are stepped.

7. The micro-motor rotor easy-assembly structure according to any one of claims 1-5, characterized in that: The assembly hole and the outer expansion hole are continuously enlarged.

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