Motor housing assembly

Abstract

The present invention provides a motor housing assembly comprising a shaft and a motor housing. The shaft has a connecting end with a groove. The motor housing has a through hole for assembling the shaft. A cylindrical portion with a force-bearing outer side and an inner side corresponding to the connecting end and the groove of the shaft is provided around the periphery of the through hole. An external force is applied to the outer side by an external means to tighten the cylindrical portion around the connecting end, thereby causing a portion of the inner side of the cylindrical portion to be squeezed into the groove to form a compression protrusion that engages with the groove below the inner surface of a top wall of the motor housing, so that the motor housing and the shaft are firmly connected and not easily detached.

Description

Technical Field

[0001] This invention relates to motor housings, and more particularly to a motor housing assembly coupled to a shaft. Background Technology

[0002] Current heat dissipation technologies, whether using heat sinks, vapor chambers, flat heat pipes, or combinations thereof on electronic components, have limited effectiveness in exchanging heat with the environment. Therefore, additional cooling fans are needed to improve heat dissipation efficiency. However, a typical fan hub has a shaft with a bearing running through it to correspond to a stator, and the fan is driven to rotate when the stator is energized and magnetically induced.

[0003] Typically, the hub (plastic) and shaft (metal) are joined together using injection molding, stamping, or riveting. However, when the torque generated by the fan's rotation exceeds the external torque between the shaft and the hub, the shaft may easily detach or loosen, damaging the fan and rendering it inoperable.

[0004] There are even more advanced ones, such as Figure 1 As shown, a housing 11 (e.g., a wheel hub or motor housing) is made of a metal material (such as iron, copper, aluminum or their alloys) and has a top 111, a side portion 112 and an opening 113. An outer side 1111 and an inner side 1112 of the top 111 are respectively formed on two opposite sides of the top 111. The opening 113 is disposed in the center of the top 11. The side portion 112 extends downward from the periphery of the top 111 and together with the top 111 defines an accommodating space 114 that communicates with the opening 113.

[0005] A shaft 12 is inserted into the opening 113 and contacts the top 111. The outer periphery of the shaft 12 is joined to the outer side 1111 of the adjacent opening 113 by laser welding (or fusion). Specifically, a laser device 13 generates a laser to fuse the outer periphery of the shaft 12 to the outer side 1111 of the adjacent opening 113, forming a welded portion 115. Additionally, the outer periphery of the shaft 12 is selectively joined to the inner side 1112 of the adjacent opening 113 by laser welding (or fusion), forming another welded portion. This laser welding integrates the housing 11 and the shaft 12, preventing the shaft 12 from becoming detached.

[0006] Laser welding uses a high-energy-density laser as a heat source to irradiate the contact area of ​​two separate components. This causes the components to absorb laser energy and rapidly melt or even vaporize, forming a molten pool. During the subsequent cooling process, they solidify together, thus joining in a physical connection. Therefore, in practice, the laser welding position often cannot be precisely controlled within the laser beam's focusing range. This can lead to the high temperature of the laser penetrating and damaging components, resulting in a low manufacturing yield. Alternatively, inconsistent welding displacement can create molten pools of varying sizes, causing inconsistencies in the dimensional accuracy of the assembly after the housing 11 and shaft 12 are joined.

[0007] Therefore, how to solve the above-mentioned problems and deficiencies is the direction that the inventors of this case and related manufacturers in this industry urgently want to study and improve. Summary of the Invention

[0008] To address the aforementioned problems, one objective of this invention is to provide a motor housing assembly that maintains dimensional stability of the assembled motor housing and shaft and improves manufacturing yield.

[0009] One object of the present invention is to provide a motor housing assembly that improves the bonding strength between the motor housing and the shaft and prevents the shaft from detaching.

[0010] To achieve the above objectives, the present invention provides a motor housing assembly, characterized in that it comprises:

[0011] A shaft with a connecting end, the connecting end having a groove and a lower part, the lower part being located below the groove;

[0012] A motor housing includes a top wall having an outer surface and an inner surface, and the top wall has a through hole for the shaft assembly. A cylindrical portion protrudes from the inner surface of the top wall through the through hole, and the cylindrical portion has an outer surface and an inner surface, and the outer surface is perpendicularly adjacent to the lower part of the inner surface of the top wall.

[0013] The shaft's connecting end is inserted into the cylindrical part and the through hole, with the groove located below the inner surface of the top wall, corresponding to the inner side of the cylindrical part. The outer side is used to withstand an external force to make the cylindrical part tightly clamp the connecting end. The external force causes a portion of the inner side to be squeezed into the groove to form a compression protrusion below the inner surface of the top wall, which is connected to the groove. The inner side has a clamping part located below the compression protrusion, tightly covering the lower part of the connecting end, so that the motor housing and the shaft are firmly connected.

[0014] The motor housing assembly, wherein: the motor housing has a side wall that extends downward from the outer periphery of the top wall, and the side wall and the top wall define a housing space.

[0015] The motor housing assembly wherein: the connecting end is solid or hollow and has a top surface that aligns with the outside of the top wall of the motor housing from the through hole.

[0016] The motor housing assembly wherein: the groove is a U-shaped, V-shaped, or C-shaped annular groove that surrounds an outer surface of the mating end.

[0017] The motor housing assembly wherein: the groove is a plurality of recesses that surround and are distributed around an outer surface of the mating end.

[0018] The motor housing assembly wherein: the plurality of recesses are elongated strips and are arranged in parallel.

[0019] The motor housing assembly wherein: the plurality of notches are respectively a plurality of pairs of two staggered elongated strips.

[0020] The motor housing assembly wherein the plurality of recesses have the same or different geometric shapes.

[0021] The motor housing assembly wherein a stress-bearing area is provided on the outer side of the cylindrical portion.

[0022] The above-mentioned structure enhances the bonding strength between the motor housing and the shaft, prevents the shaft from detaching from the motor housing, maintains the dimensional stability of the motor housing assembly after the motor housing and shaft are combined, and improves the manufacturing yield. Attached Figure Description

[0023] Figure 1 This is a three-dimensional sectional view of the prior art;

[0024] Figure 2A This is a three-dimensional sectional exploded view of the present invention;

[0025] Figure 2B This is an exploded cross-sectional view of the present invention;

[0026] Figures 2C-2E This is a cross-sectional view of the assembly of the present invention;

[0027] Figure 2F A schematic diagram showing that a stress-bearing zone is further provided on the outer side of the cylindrical part of the present invention;

[0028] Figures 3A-3G This is a schematic diagram illustrating various variations of the axis of the present invention;

[0029] Figure 4A This is a schematic diagram of the invention applied to a fan wheel;

[0030] Figure 4B This is a schematic diagram of the fan wheel in this invention.

[0031] Explanation of reference numerals in the attached drawings: 11. Housing; 111. Top; 1111. Outer side; 1112. Inner side; 112. Side; 113. Opening; 114. Accommodation space; 115. Welded part; 12. Shaft; 13. Laser device; 20. Motor housing assembly; 21. Motor housing; 21. Top wall; 2111. Outer surface of top wall; 2112. Inner surface of top wall; 2113. Through hole; 24. Cylindrical part; 241. Outer surface; 2411. Stress zone; 242. Inner surface; 242. Extrusion protrusion; 2421. Lower clamping part; 2422. Side wall; 212. Fan blade; 2121. Housing space; 213. Shaft; 22. Joint end; 221. Groove; 2211, 2211a; Lower part; 2212. Top surface; 2213. External means; 25. External force F; Fan wheel; 30. Hub; 31. Fan blade; 311. Thickness d: Motor housing assembly. Detailed Implementation

[0032] The above-mentioned objectives of the present invention and its structural and functional characteristics will be described with reference to the preferred embodiments shown in the accompanying drawings.

[0033] Please refer to Figure 2A This is a three-dimensional sectional exploded view of the present invention; Figure 2B This is an exploded cross-sectional view of the present invention; Figures 2C-2F This is a cross-sectional view of the present invention. As shown, a motor housing assembly 20 includes a motor housing 21 and a shaft 22. The motor housing 21 includes a top wall 211 and a side wall 212. The side wall 212 extends downward from the outer periphery of the top wall 211, and the top wall 211 and the side wall 212 together define a housing space 213. The top wall 211 has an outer surface 2111 and an inner surface 2112, and the top wall 211 is provided with a through hole 2113 for the shaft 22 to be assembled. The motor housing 21 is made of a metal material (such as iron, copper, aluminum alloy, etc.). A cylindrical portion 24 protrudes downward from the inner surface 2112 of the top wall and is located in the housing space 213. The cylindrical portion 24 is connected to the through hole 2113 and has an outer surface 241 and an inner surface 242 for bearing force. The outer surface 241 is perpendicularly adjacent to the lower part of the inner surface 2112 of the top wall, and a force-bearing area 2411 is further provided on the outer surface 241 (e.g., Figure 2F ).

[0034] The shaft 22 is made of metal (such as iron, stainless steel, etc.) and has a connecting end 221 and a free end. The connecting end 221 has a groove 2211 and a lower part 2212, with the lower part 2212 located below the groove 2211. In this embodiment, the groove 2211 is a U-shaped annular groove surrounding an outer surface of the connecting end 221. The connecting end 221 is inserted into the cylindrical part 24 and flush with the through hole 2113, so that the groove 2211 is located below the inner surface 2112 of the top wall and corresponds to the inner side surface 242 of the cylindrical part 24, and the top surface 2213 of the connecting end 221 is aligned with the outer surface 2111 of the top wall of the motor housing 21 from the through hole 2113.

[0035] In detail, the outer surface 241 of the cylindrical portion 24 is used to withstand an external force F (e.g., pressure) from an external means 25 (e.g., a pressure clamp) to tightly clamp the cylindrical portion 24 around the connecting end 221 of the shaft 22. The external force F causes a portion of the inner surface 242 to deform and be forced into the groove 2211 of the shaft 22, forming a pressing protrusion 2421 below the inner surface 2112 of the top wall, which engages with the groove 2211. The inner surface 242 has a clamping portion 2422 located below the pressing protrusion 2421, tightly covering the lower part 2212 of the connecting end 221. This ensures that the motor housing 21 and the shaft 22 are firmly connected and not easily detached. Furthermore, since the pressing protrusion 2421 is formed by partial material extrusion of the cylindrical portion 24, the thickness d between the outer surface 241 and the inner surface 242 of the cylindrical portion 24 becomes thinner.

[0036] Alternatively, an external force F can be locally applied to the stress area 2411 on the outer surface 241 of the cylindrical portion 24, causing the stress area 2411 to deform inward from the outer surface 241, while the inner surface 242 protrudes towards the axis 22, in order to tighten the coupling end of the axis 22 (e.g., Figure 2F In addition, by having the lower clamping part 2422 cover the lower part 2212 of the connecting end 221, the contact area between the cylindrical part 24 and the connecting end 221 of the shaft 22 is increased, thereby improving the connection strength between the motor housing 21 and the shaft 22 and preventing the shaft 22 from detaching.

[0037] Please continue to refer to this. Figures 3A-3G This is a schematic diagram illustrating various variations of the shaft of the present invention. As shown in the figure, the groove 2211 of the shaft 15 in the above embodiment is a U-shaped annular groove in this embodiment (e.g., Figure 3A As shown), but not limited to this, the groove 2211 can also be a C-shaped annular groove (as shown). Figure 3B (as shown) or V-shaped annular groove (such as) Figure 3C (As shown). In other embodiments, the groove 2211a is a plurality of notches surrounding an outer surface of the mating end 221. These plurality of notches are, for example, a parallel strip (e.g., ...). Figure 3E(as shown); or a complex pair of two interlaced strips (such as...) Figure 3F (as shown) or the same or different geometric shapes (e.g. Figure 3G (As shown). Furthermore, during implementation, the mating end 221 of the shaft 22 can be selected to be solid based on the magnitude of the external force between the shaft 22 and the motor housing 21 (e.g., Figure 3A , Figure 3B , Figures 3E-3G (as shown) or hollow (as shown) Figure 3D (As shown).

[0038] Please continue to refer to this. Figure 4A This is a schematic diagram of the invention applied to a fan wheel; Figure 4B This is a schematic diagram of the present invention as a fan wheel. As shown in the figure, the aforementioned motor housing assembly 20 is combined with a hub 31 having a plurality of fan blades 311 to form a fan wheel 30 (e.g., Figure 4A Alternatively, a plurality of fan blades 2121 may be provided on the side wall 212 of the motor housing 21 to form a fan wheel (e.g. Figure 4B ).

[0039] The above-mentioned structure enhances the bonding strength between the motor housing 21 and the shaft 22, prevents the shaft 22 from detaching from the motor housing 21, maintains the dimensional stability of the motor housing assembly 20 after the motor housing 21 and the shaft 22 are combined, and improves the manufacturing qualification rate.

[0040] The above description is illustrative only and not restrictive of the present invention. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all such modifications, variations or equivalents will fall within the protection scope of the present invention.

Claims

1. A motor housing assembly, characterized in that, Include: A shaft with a connecting end, the connecting end having a groove and a lower part, the lower part being located below the groove; A motor housing includes a top wall having an outer surface and an inner surface, and the top wall has a through hole for the shaft assembly. A cylindrical portion protrudes from the inner surface of the top wall through the through hole, and the cylindrical portion has an outer surface and an inner surface, and the outer surface is perpendicularly adjacent to the lower part of the inner surface of the top wall. The shaft's connecting end is inserted into the cylindrical part and the through hole, with the groove located below the inner surface of the top wall, corresponding to the inner side of the cylindrical part. The outer side is used to withstand an external force to make the cylindrical part tightly clamp the connecting end. The external force causes a portion of the inner side to be squeezed into the groove to form a compression protrusion below the inner surface of the top wall, which is connected to the groove. The inner side has a clamping part located below the compression protrusion, tightly covering the lower part of the connecting end, so that the motor housing and the shaft are firmly connected.

2. The motor housing assembly as described in claim 1, characterized in that: The motor housing has a side wall that extends downward from the outer periphery of the top wall and defines a housing space with the top wall.

3. The motor housing assembly as described in claim 1, characterized in that: The joint end is solid or hollow and has a top surface that aligns with the outside of the top wall of the motor housing from the through hole.

4. The motor housing assembly as described in claim 1, characterized in that: The groove is a U-shaped, V-shaped, or C-shaped annular groove that surrounds an outer surface of the joint end.

5. The motor housing assembly as claimed in claim 1, characterized in that: The groove is a plurality of notches that surround and are distributed on an outer surface of the joint end.

6. The motor housing assembly as described in claim 5, characterized in that: The plurality of notches are each elongated and arranged in parallel.

7. The motor housing assembly as claimed in claim 5, characterized in that: The complex notches are two interlaced strips, each representing a complex pair.

8. The motor housing assembly as claimed in claim 5, characterized in that: The complex notches may have the same or different geometric shapes.

9. The motor housing assembly as claimed in claim 1, characterized in that: A stress-bearing zone is provided on the outer side of the cylinder.

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