CN114400819A

CN114400819A - Motor shell assembly

Info

Publication number: CN114400819A
Application number: CN202210002781.2A
Authority: CN
Inventors: 钱进
Original assignee: Asia Vital Components Shenzhen Co Ltd
Current assignee: Asia Vital Components Shenzhen Co Ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-04-26

Abstract

The invention provides a motor housing assembly, which includes a shaft center and a motor housing, the shaft center has a joint end with a groove portion, the motor housing has a through hole for the shaft center to be assembled, the through The periphery of the hole is provided with a cylindrical portion with a stressed outer side and an inner side corresponding to the joint end and the groove portion surrounding the axis, and an external force is applied to the outer side by an external means to make the barrel tightly hoop. The joint end, and then part of the inner side of the cylindrical portion is squeezed into the groove to form an extrusion protrusion below the inner surface of a top wall of the motor housing to be combined with the groove, so that the motor housing and the The shaft center is tightly combined and it is not easy to disengage.

Description

Motor shell assembly

Technical Field

The present invention relates to a motor housing, and more particularly, to a motor housing assembly coupled to a shaft.

Background

In the current heat dissipation technology, no matter the heat sink or the temperature equalizing plate or the flat heat pipe or the combination thereof on the electronic component has a limited effect of heat exchange with the environment, a heat dissipation fan for enhancing the heat dissipation efficiency needs to be additionally added to dissipate the heat of the electronic component, so as to enhance the heat dissipation efficiency. However, the hub of the conventional fan has an axis passing through a bearing to correspond to a stator, and drives the fan to operate when the stator is energized and induced.

Usually, the hub (plastic) and the shaft (metal) are integrated by injection molding, punching or riveting, but when the torque of the rotating knob generated by the rotation of the fan is greater than the external torque between the shaft and the hub, the shaft is easily separated or loosened, and the fan is damaged and cannot be operated.

More particularly, as shown in fig. 1, a housing 11 (e.g., a hub or a motor housing) is made of metal (e.g., iron, copper, aluminum or an alloy thereof) and has a top portion 111, a side portion 112 and an opening 113, an outer side 1111 and an inner side 1112 of the top portion 111 are respectively formed on two opposite sides of the top portion 111, the opening 113 is disposed through the center of the top portion 11, and the side portion 112 extends downward from the periphery of the top portion 111 and defines a receiving space 114 with the top portion 111 to communicate with the opening 113.

A shaft 12 is inserted into the opening 113 to contact the top 111, and is joined to the outer periphery of the shaft 12 at the contact with the outer side 1111 of the adjacent opening 113 by a laser welding (or fusion bonding). That is, a laser tool 13 generates a laser beam to weld the outer periphery of the core 12 and the outer side 1111 of the adjacent opening 113 to form a welded portion 115. In addition, another welded portion is formed by the laser welding (or fusion welding) selectively at the contact portion between the outer peripheral side of the shaft core 12 and the inner side 1112 adjacent to the opening 113. The shell 11 and the axle center 12 are integrated by the laser welding to prevent the axle center 12 from loosening.

The laser welding adopts high-energy-density laser as a heat source to irradiate the contact positions of the two separated components, so that the separated components are quickly melted or even vaporized after absorbing laser energy and jointly form a molten pool, and are solidified together in the subsequent cooling process so as to be connected together. Therefore, it often happens in practice that the laser welding position cannot be controlled very precisely within the focusing range of the laser beam, which results in low manufacturing yield due to the high temperature of the laser penetrating the damaged element, or the dimensional accuracy of the assembly after the shell 11 is combined with the shaft center 12 due to the formation of melt pools with different sizes due to the time inconsistency of the welding displacement.

Therefore, how to solve the above problems and disadvantages is a direction in which the present inventors and related manufacturers in the industry desire to research and improve.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a motor housing assembly that maintains the assembly size of the motor housing and the shaft after assembly, and improves the manufacturing yield.

The invention aims to provide a motor shell assembly which can improve the bonding strength of a motor shell and an axle center and prevent the axle center from being separated.

To achieve the above object, the present invention provides a motor housing assembly, comprising:

an axis with a combining end, the combining end is provided with a groove part and a lower part, and the lower part is positioned below the groove part;

a motor shell, including a top wall with a top wall outer surface and a top wall inner surface, and the top wall is provided with a through hole for the axle center assembly, the periphery of the through hole protrudes from the top wall inner surface to form a cylinder part communicated with the through hole, and the cylinder part is provided with an outer side surface and an inner side surface, and the outer side surface is vertically adjacent to the lower part of the top wall inner surface;

the combination end of the axle center is inserted into the cylinder part and the through hole, the groove part is positioned below the inner surface of the top wall and corresponds to the inner side surface of the cylinder part, the outer side surface is used for bearing an external force of an external means so as to enable the cylinder part to tightly hoop the combination end, part of the inner side surface is extruded into the groove part by means of the external force to form an extrusion convex body to be combined with the groove part below the inner surface of the top wall, and the inner side surface is provided with a lower clamping part which is positioned below the extrusion convex body and tightly wraps the lower part of the combination end, so that the motor shell is tightly combined with the axle center.

The motor housing assembly, wherein: the motor shell is provided with a side wall, the side wall extends downwards from the periphery of the top wall, and the side wall and the top wall define a shell space.

The motor housing assembly, wherein: the coupling end is solid or hollow and has a top surface aligned with the top wall of the motor housing from the through hole.

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

The motor housing assembly, wherein: the groove part is a plurality of notches which are distributed around the outer surface of the combining end.

The motor housing assembly, wherein: the plurality of notches are respectively in a strip shape and are arranged in parallel.

The motor housing assembly, wherein: the plurality of notches are a plurality of pairs of two interlaced strips.

The motor housing assembly, wherein: the plurality of notches are of the same or different geometric shapes respectively.

The motor housing assembly, wherein: the outer side surface of the cylinder part is provided with a stress area.

By means of the structure, the bonding strength of the motor shell and the axle center is improved, the axle center is prevented from being separated from the motor shell, the size stability of the motor shell assembly formed by combining the motor shell and the axle center is maintained, and the manufacturing qualified rate is improved.

Drawings

FIG. 1 is a schematic perspective cross-sectional view of the prior art;

FIG. 2A is a schematic exploded perspective view of the present invention;

FIG. 2B is a schematic cross-sectional exploded view of the present invention;

FIGS. 2C-2E are schematic sectional views of the present invention;

FIG. 2F is a schematic view of the outer side surface of the cylindrical portion of the present invention further including a force-bearing area;

FIGS. 3A-3G are schematic views of various embodiments of the hub of the present invention;

FIG. 4A is a schematic view of the present invention applied to a fan wheel;

fig. 4B is a schematic view of the present invention as a fan wheel.

Description of reference numerals: a housing 11; a top portion 111; an outer side 1111; an inner side 1112; a side portion 112; an opening 113; an accommodating space 114; a weld 115; a shaft core 12; a laser instrument 13; a motor housing assembly 20; a motor housing 21; a top wall 211; an upper wall outer face 2111; an inner top wall surface 2112; through hole 2113; a barrel portion 24; an outer side surface 241; a force-bearing zone 2411; an inner side 242; the extrusion bosses 2421; a lower grip portion 2422; a sidewall 212; fan blades 2121; a housing space 213; a shaft core 22; a coupling end 221; the

groove portions

2211, 2211 a; a lower portion 2212; a top surface 2213; an external means 25; an external force F; a fan wheel 30; a hub 31; fan blades 311; thickness d motor housing assembly.

Detailed Description

The above objects, together with the structural and functional features thereof, are accomplished by the preferred embodiments according to the accompanying drawings.

Please refer to fig. 2A, which is a schematic exploded perspective view of the present invention; FIG. 2B is a schematic cross-sectional exploded view of the present invention; FIGS. 2C-2F are schematic sectional views 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 periphery of the top wall 211, and the top wall 211 and the side wall 212 jointly define a housing space 213. The top wall 211 has a top wall outer surface 2111 and a top wall inner surface 2112, and the top wall 211 has a through hole 2113 for assembling the shaft 22, and the motor housing 21 is made of metal material (such as iron, copper, aluminum alloy, etc.). The periphery of the through hole 2113 projects downward from the top wall inner surface 2112 to form a cylindrical portion 24 located in the housing space 213. The cylinder 24 is connected to the through hole 2113 and has an outer surface 241 for receiving force and an inner surface 242, the outer surface 241 is vertically adjacent to the lower portion of the top wall inner surface 2112, and the outer surface 241 is further provided with a force receiving area 2411 (as shown in fig. 2F).

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

Specifically, the outer surface 241 of the tube portion 24 is used to receive an external force F (e.g. pressure) from an external device 25 (e.g. a pressure clamp) to make the tube portion 24 tightly bind the coupling end 221 of the shaft core 22, and part of the inner surface 242 is deformed by the external force F and is squeezed into the groove 2211 of the shaft core 22 to form a squeezing protrusion 2421 to couple the groove 2211 below the top wall inner surface 2112, and the inner surface 242 has a lower clamping portion 2422 located below the squeezing protrusion 2421 to tightly wrap the lower portion 2212 of the coupling end 221, so that the motor housing 21 is tightly coupled with the shaft core 22 and is not easily separated. Furthermore, since the pressing protrusion 2421 is formed by pressing a partial material of the tube portion 24, a thickness d of the tube portion 24 between the outer side surface 241 and the inner side surface 242 becomes thin.

Alternatively, an external force F may be locally applied to the force-receiving area 2411 on the outer surface 241 of the tube portion 24, so that the force-receiving area 2411 is deformed to be inwardly concave from the outer surface 241 and to be convex toward the shaft center 22, thereby tightening the coupling end of the shaft center 22 (see fig. 2F). In addition, the lower fastening part 2422 covers the lower part 2212 of the connecting end 221 to increase the connecting area of the connecting end 221 of the cylinder part 24 and the shaft core 22, thereby improving the connecting strength between the motor shell 21 and the shaft core 22 and preventing the shaft core 22 from being separated.

Please refer to fig. 3A-3G for various embodiments of the present invention. As shown, the groove 2211 of the shaft core 15 of the above embodiment is a U-shaped annular groove (as shown in fig. 3A) in the present embodiment, but is not limited thereto, and the groove 2211 may be a C-shaped annular groove (as shown in fig. 3B) or a V-shaped annular groove (as shown in fig. 3C). In other embodiments, the slot 2211a is a plurality of notches circumferentially disposed on an outer surface of the connecting end 221. The plurality of notches are, for example, an elongated shape (as shown in fig. 3E) arranged in parallel; or a plurality of pairs of two interleaved strips (as shown in fig. 3F) or the same or different geometries (as shown in fig. 3G). In addition, the coupling end 221 of the shaft 22 may be selected to be solid (as shown in fig. 3A, 3B, and 3E-3G) or hollow (as shown in fig. 3D) according to the magnitude of the external force of the shaft 22 and the motor housing 21.

Please refer to fig. 4A for a schematic view of the fan wheel according to the present invention; fig. 4B is a schematic view of the present invention as a fan wheel. As shown, the motor housing assembly 20 is combined with a hub 31 having a plurality of blades 311 to form a fan 30 (fig. 4A) or a plurality of blades 2121 are disposed on the sidewall 212 of the motor housing 21 to form a fan (fig. 4B).

By virtue of the structure, the bonding strength between the motor shell 21 and the shaft center 22 is improved, the shaft center 22 is prevented from being separated from the motor shell 21, the size stability of the motor shell assembly 20 after the motor shell 21 and the shaft center 22 are combined is maintained, and the manufacturing yield is improved.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A motor housing assembly, comprising:

2. The motor housing assembly of claim 1, wherein: the motor shell is provided with a side wall, the side wall extends downwards from the periphery of the top wall, and the side wall and the top wall define a shell space.

3. The motor housing assembly of claim 1, wherein: the coupling end is solid or hollow and has a top surface aligned with the top wall of the motor housing from the through hole.

4. The motor housing assembly of claim 1, wherein: the groove portion is a U-shaped, V-shaped or C-shaped annular groove that surrounds an outer surface of the coupling end.

5. The motor housing assembly of claim 1, wherein: the groove part is a plurality of notches which are distributed around the outer surface of the combining end.

6. The motor housing assembly of claim 5, wherein: the plurality of notches are respectively in a strip shape and are arranged in parallel.

7. The motor housing assembly of claim 5, wherein: the plurality of notches are a plurality of pairs of two interlaced strips.

8. The motor housing assembly of claim 5, wherein: the plurality of notches are of the same or different geometric shapes respectively.

9. The motor housing assembly of claim 1, wherein: the outer side surface of the cylinder part is provided with a stress area.