Brushless motor end cover anti-corrosion structure

Abstract

The utility model discloses a kind of brushless motor end cover anticorrosion structure, including metal end cover, bearing mounting seat is arranged in the metal end cover, several connecting holes are uniformly distributed on the outer periphery of the metal end cover, it is characterized by: engineering plastic protective layer is arranged in the surface of the metal end cover by injection molding, the hole wall of the connecting hole is covered by the engineering plastic protective layer. The utility model aims at overcoming the deficiencies in the prior art, and provides a kind of anticorrosion structure with simple structure, which can prevent the corrosion of brushless motor end cover.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, specifically to a corrosion-resistant structure for a brushless motor end cap. Background Technology

[0002] Brushless DC motors are a new type of integrated motor that has emerged with the development of electronic technology. Compared with ordinary brushed motors, brushless DC motors have a simpler structure, eliminating carbon brushes. They mainly consist of a rotor and a stator, with coils wound on the stator and magnets arranged inside the rotor. When the coils are energized, the rotor rotates in an electric field. Brushless DC motors are widely used in automotive, aerospace, marine, medical, and automation fields. Because they do not use mechanical commutation brushes but instead rely on electronic steering, they achieve excellent torque characteristics, longer service life, lower noise, and higher speeds.

[0003] In the process of using brushless motors in textiles and yarns, the air in the operating environment is often acidic. In such an environment, the motor end caps of traditional brushless motors are easily corroded, and a brushless motor often needs to be replaced every six months, which greatly increases production costs.

[0004] Traditional motor end cover corrosion protection often uses surface spraying (such as electrophoresis, spray painting) or electroplating processes, but there are the following disadvantages: First, the coating thickness is uneven, and pinholes or missed coatings are easy to appear in complex parts such as connection holes and corners; Second, the coating has weak adhesion to the metal substrate, and it is easy to peel off under long-term vibration or assembly friction. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a simple anti-corrosion structure that can prevent the brushless motor end cover from being corroded.

[0006] To achieve the above objectives, the present invention adopts the following solution: a corrosion-resistant structure for a brushless motor end cover, comprising a metal end cover, a bearing mounting seat disposed inside the metal end cover, and a plurality of connecting holes evenly distributed on the outer periphery of the metal end cover, characterized in that: an engineering plastic protective layer is injection molded onto the surface of the metal end cover, and the engineering plastic protective layer covers the hole walls of the connecting holes.

[0007] As another improvement to the anti-corrosion structure of the brushless motor end cover of this utility model, a limiting step is provided on the inner end of the connecting hole, and a limiting part is provided on the engineering plastic protective layer at the corresponding position of the limiting step, and the limiting part is provided on the limiting step.

[0008] As another improvement to the anti-corrosion structure of the brushless motor end cap of this utility model, an anchoring structure is provided on the surface of the metal end cap to increase the bonding force between the engineering plastic protective layer and the metal end cap.

[0009] As another improvement to the anti-corrosion structure of the brushless motor end cover of this utility model, the anchoring structure is a groove formed on the surface of the metal end cover.

[0010] As another improvement to the anti-corrosion structure of the brushless motor end cover of this utility model, the anchoring structure is a protrusion formed on the metal end cover.

[0011] As another improvement to the anti-corrosion structure of the brushless motor end cover of this utility model, the anchoring structure is a hole opened around the metal end cover.

[0012] As another improvement to the anti-corrosion structure of the brushless motor end cover of this utility model, the anchoring structure is a knurling formed on the surface of the metal end cover.

[0013] As another improvement to the anti-corrosion structure of the brushless motor end cover of this utility model, heat dissipation ribs are provided on the surface of the metal end cover, and the upper part of the heat dissipation ribs extends through the engineering plastic protective layer.

[0014] As another improvement to the anti-corrosion structure of the brushless motor end cover of this utility model, a positioning notch is provided in the middle of the heat dissipation rib, and a first flange is provided at the position corresponding to the positioning notch on the engineering plastic protective layer, and the first flange is attached to the positioning notch.

[0015] As another improvement to the anti-corrosion structure of the brushless motor end cover of this utility model, a positioning step is provided on the bottom surface of the outer wall of the metal end cover, and the engineering plastic protective layer is provided with a second flange corresponding to the positioning step, and the second flange is attached to the positioning step.

[0016] In summary, the advantages of this utility model compared to the prior art are: the utility model has a simple structure, and uses an engineering plastic layer to completely wrap the surface of the metal end cap and the inner wall containing the connection hole, which completely isolates the metal from the contact with the corrosive medium, and the corrosion prevention is significantly better than the traditional spraying process. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the present invention.

[0018] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0019] Figure 3 This is a top view of the present invention.

[0020] Figure 4 This is a partial cross-sectional schematic diagram of the present invention.

[0021] Figure 5 This is a schematic diagram of the first embodiment of the anchoring structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the second embodiment of the anchoring structure of this utility model.

[0023] Figure 6 This is a schematic diagram of the third embodiment of the anchoring structure of this utility model.

[0024] Figure 7 This is a cross-sectional view of the heat dissipation ribs of this utility model when connected to the engineering plastic protective layer.

[0025] Figure 8 This is a schematic diagram of the first flange of this utility model. Detailed Implementation

[0026] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0027] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0028] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0029] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0030] like Figure 1-8 As shown, a corrosion-resistant structure for a brushless motor end cover includes a metal end cover 1, a bearing mounting seat 2 is provided inside the metal end cover 1, a plurality of connecting holes 3 are evenly distributed on the outer periphery of the metal end cover 1, and an engineering plastic protective layer 4 is injection molded on the surface of the metal end cover 1, the engineering plastic protective layer 4 covering the hole wall 5 of the connecting holes 3.

[0031] This invention utilizes an engineering plastic layer to completely encapsulate the surface of the metal end cap and the inner wall containing the connecting holes, thoroughly isolating the metal from corrosive media. The corrosion protection is significantly superior to traditional spraying processes. The engineering plastic protective layer 4 described in this invention has a Shore hardness of D80 or higher, possessing excellent scratch resistance. Even if tools rub against the edge of the connecting holes during bolt assembly, the protective layer will not be damaged, ensuring reliable corrosion protection during long-term use.

[0032] The engineering plastic protective layer 4 is made of engineering plastic with excellent weather resistance, such as PA66+30% glass fiber reinforced material, with a temperature range of -40℃ to 120℃. It can withstand the temperature rise during motor operation and external environmental corrosive media, such as water vapor, oil stains, weak acids and alkalis.

[0033] The hole wall 5 of the connecting hole 3 serves as the force-bearing surface for bolt assembly. Its fully enclosed structure can prevent electrochemical corrosion caused by direct contact between the bolt and the metal hole wall, while also preventing dust and moisture from seeping into the end cap through the thread gap.

[0034] In this invention, a limiting step 6 is provided on the inner end of the connecting hole 3, and a limiting part 7 is provided on the engineering plastic protective layer 4 at a position corresponding to the limiting step 6. The limiting part 7 is disposed on the limiting step 6. In this invention, the annular limiting step 6 provided on the inner end of the connecting hole 3 further improves the connection stability between the engineering plastic protective layer 4 and the metal end cap 1.

[0035] In this invention, an anchoring structure is provided on the surface of the metal end cap 1 to increase the bonding force between the engineering plastic protective layer 4 and the metal end cap 1.

[0036] In the first embodiment of the anchoring structure described in this utility model, the anchoring structure is a groove 8 formed on the surface of the metal end cap 1.

[0037] In the second embodiment of the anchoring structure described in this utility model, the anchoring structure is a protrusion 9 formed on the metal end cap 1.

[0038] In the third embodiment of the anchoring structure described in this utility model, the anchoring structure is a hole 10 opened around the metal end cap 1.

[0039] The fourth embodiment of the anchoring structure described in this utility model is a knurling formed on the surface of the metal end cap 1.

[0040] The anchoring structure can effectively improve the bonding force between the engineering plastic protective layer 4 and the surface of the metal end cap 1, and effectively prevent them from separating during high-speed rotation.

[0041] In this invention, a heat dissipation rib 11 is provided on the surface of the metal end cap 1, and the upper part of the heat dissipation rib 11 extends through the engineering plastic protective layer 4. The portion of the heat dissipation rib 11 extending through the engineering plastic protective layer 4 is coated with an anti-corrosion coating. By placing the heat dissipation rib 11 on the outside of the engineering plastic protective layer 4, this invention ensures both anti-corrosion effect and heat dissipation effect of the metal end cap 1.

[0042] In this utility model, a positioning notch 12 is provided in the middle of the heat dissipation rib 11, and a first flange 13 is provided in the engineering plastic protective layer 4 at the corresponding position of the positioning notch 12. The first flange 13 is attached to the positioning notch 12.

[0043] In this utility model, a positioning step 14 is provided on the bottom surface of the outer wall of the metal end cap 1, and the engineering plastic protective layer 4 is provided with a second flange 15 corresponding to the positioning step 14. The second flange 15 is attached to the positioning step 14.

[0044] In this invention, the bottom surface of the outer wall of the metal end cap 1 serves as the edge transition area of ​​the engineering plastic protective layer 4, and its structural integrity directly affects the sealing performance of the anti-corrosion layer. Traditional injection-molded protective layers are prone to "edge peeling" at the edges due to stress concentration during molding or factors such as subsequent assembly and vibration, leading to the intrusion of corrosive media from the edge gaps and damage to the metal end cap. To address this, this invention specifically provides a positioning step 14 on the bottom surface of the outer wall of the metal end cap 1, near the assembly joint surface between the end cap and the motor housing. This step extends circumferentially along the bottom surface of the outer wall of the end cap, forming a ring or segmented structure, with a height typically of 0.5-2 mm. The step surface forms a 90° or obtuse angle transition with the outer wall of the end cap, which not only does not affect the overall assembly dimensions of the end cap but also provides a precise limiting reference for the edge molding of the engineering plastic protective layer 4.

[0045] During injection molding of the engineering plastic protective layer 4, a second flange 15 is simultaneously formed at the position corresponding to the positioning step 14. The thickness of the second flange 15 is adapted to the height of the positioning step 14, its inner sidewall is tightly fitted with the vertical surface of the positioning step 14, and its lower surface is in complete contact with the horizontal surface of the positioning step 14, forming a dual constraint structure of surface-to-surface contact and lateral restraint. The technical value of this design is reflected in the following aspects: First, the positioning step 14 provides a clear molding boundary for the second flange 15, avoiding excessive overflow or insufficient filling of the plastic melt at the bottom edge of the end cap during injection molding, ensuring the regularity of the edge contour of the protective layer; Second, the fit structure between the second flange 15 and the positioning step 14 can effectively limit the axial and radial displacement of the engineering plastic protective layer 4. When the motor vibrates during operation, the second flange 15 will be "locked" by the positioning step 14, preventing it from sliding along the bottom surface of the end cover or bending upwards, thus avoiding cracks at the edge of the protective layer due to vibration. Thirdly, the structure forms a physical barrier on the bottom surface of the end cover's outer wall through the tight fit between the first flange and the step, preventing corrosive media such as water vapor, salt spray, and dust from the external environment from invading through the gap between the edge of the protective layer and the metal end cover, ensuring the overall sealing of the anti-corrosion layer and further extending the service life of the motor end cover.

[0046] In this invention, the design of the heat dissipation rib positioning notch and the first flange, the positioning step on the bottom surface of the outer wall and the second flange together constitute a multi-point anchoring and full-area limiting connection system between the engineering plastic protective layer 4 and the metal end cap 1. While ensuring heat dissipation performance, it significantly improves the structural stability and interface sealing of the anti-corrosion layer, making the anti-corrosion effect of this invention more thorough and longer-lasting than that of traditional spraying processes.

[0047] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant end cap structure for a brushless motor, comprising a metal end cap (1), a bearing mounting seat (2) disposed inside the metal end cap (1), and a plurality of connecting holes (3) evenly distributed on the outer periphery of the metal end cap (1), characterized in that: An engineering plastic protective layer (4) is injection molded onto the surface of the metal end cap (1), and the engineering plastic protective layer (4) covers the hole wall (5) of the connecting hole (3).

2. The anti-corrosion structure for a brushless motor end cover according to claim 1, characterized in that: A limiting step (6) is provided on the inner end of the connecting hole (3), and a limiting part (7) is provided on the engineering plastic protective layer (4) at the corresponding position of the limiting step (6). The limiting part (7) is provided on the limiting step (6).

3. The anti-corrosion structure for a brushless motor end cover according to claim 1, characterized in that: An anchoring structure is provided on the surface of the metal end cap (1) to increase the bonding force between the engineering plastic protective layer (4) and the metal end cap (1).

4. The anti-corrosion structure for a brushless motor end cover according to claim 3, characterized in that: The anchoring structure is a groove (8) formed on the surface of the metal end cap (1).

5. The anti-corrosion structure for a brushless motor end cover according to claim 3, characterized in that: The anchoring structure is a protrusion (9) on the metal end cap (1).

6. The anti-corrosion structure for a brushless motor end cover according to any one of claims 3-5, characterized in that: The anchoring structure is a hole (10) opened around the metal end cap (1).

7. The anti-corrosion structure for a brushless motor end cover according to claim 3, characterized in that: The anchoring structure is a knurling formed on the surface of the metal end cap (1).

8. The anti-corrosion structure for a brushless motor end cover according to claim 1, characterized in that: A heat dissipation rib (11) is provided on the surface of the metal end cap (1), and the upper part of the heat dissipation rib (11) extends through the engineering plastic protective layer (4).

9. The anti-corrosion structure for a brushless motor end cover according to claim 8, characterized in that: A positioning notch (12) is provided in the middle of the heat dissipation rib (11), and a first flange (13) is provided at the corresponding position of the engineering plastic protective layer (4) and the positioning notch (12). The first flange (13) is attached to the positioning notch (12).

10. The anti-corrosion structure for a brushless motor end cover according to claim 1, characterized in that: A positioning step (14) is provided on the bottom surface of the outer wall of the metal end cap (1), and the engineering plastic protective layer (4) is provided with a second flange (15) corresponding to the positioning step (14), and the second flange (15) is attached to the positioning step (14).

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