A direct current brush motor rotor cooling fan assembly and motor

Abstract

The utility model relates to a kind of DC brush motor rotor cooling fan assembly components and motor, including rotor core, its end face is equipped with multiple assembly holes;Cooling fan, it includes installation base ring, the installation base ring is equipped with multiple protrusions that are evenly distributed along its circumference, the assembly hole is matched with the protrusion, multiple the protrusions are respectively inserted in multiple the assembly hole, and the assembly hole is matched with the protrusion interference fit.The utility model not only improves cooling fan positioning accuracy and connection strength, also reduces the assembly cost and difficulty of cooling fan.

Description

Technical Field

[0001] This utility model relates to the field of brushed motor technology, and in particular to a DC brushed motor rotor cooling fan assembly and motor. Background Technology

[0002] Currently, DC brushed motor cooling fans are generally assembled onto the rotor core using either pin-fitting or adhesive bonding. When using adhesive bonding, the adhesive needs to be baked and cured, which has the disadvantage of complex process and poor positioning accuracy. When using pin-fitting, the fan pins need to be inserted into the wire clearance slots of the rotor core, which makes the fan pins prone to damaging the enameled wire. When the rotor slot fill factor is high, there are also problems such as the fan pins not being able to fit into the wire clearance slots, resulting in the connection strength of the cooling fan not being effectively guaranteed. Summary of the Invention

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the problems of low positioning accuracy, poor connection strength and high assembly cost of the cooling fan and rotor core in the prior art, and to provide a DC brushed motor rotor cooling fan assembly component and motor, which not only improves the positioning accuracy and connection strength of the cooling fan, but also reduces the assembly cost and difficulty.

[0004] To solve the above-mentioned technical problems, this utility model provides a DC brushed motor rotor cooling fan assembly, comprising,

[0005] The rotor core has multiple assembly holes on its end face;

[0006] A cooling fan includes a mounting base ring having a plurality of protrusions evenly distributed along its circumference, mounting holes conforming to the protrusions, the plurality of protrusions being respectively inserted into the plurality of mounting holes, and the mounting holes and protrusions being interference-fitted.

[0007] In one embodiment of the present invention, a plurality of the mounting holes are distributed in a ring around the center of the end face and are arranged symmetrically about the center of the end face.

[0008] In one embodiment of the present invention, the rotor core includes a rotor core body and a plurality of teeth extending radially along the rotor core body. The plurality of teeth are evenly distributed circumferentially along the rotor core body, and the mounting hole is provided at the end of the tooth furthest from the rotor core body.

[0009] In one embodiment of this utility model, the end of the tooth furthest from the rotor core body is provided with a tooth wing, the width of the tooth wing is greater than the width of the tooth, and the tooth wing is provided with the mounting hole.

[0010] In one embodiment of the present invention, the mounting base ring abuts against the toothed wing along its axial direction.

[0011] In one embodiment of the present invention, a support ring is further included, which is embedded inside the mounting base ring. The support ring includes a support ring body and a plurality of arms extending radially along the support ring body. The support ring body is coaxially arranged with the mounting base ring, and the plurality of arms are evenly distributed circumferentially along the support ring body. The arms abut against the inner wall of the mounting base ring.

[0012] In one embodiment of this utility model, the plurality of arm bodies and the plurality of teeth are arranged directly opposite each other along the axis of the mounting base ring.

[0013] In one embodiment of this utility model, the diameter of the rotor core is equal to the diameter of the mounting base ring, and the rotor core and the mounting base ring are coaxially arranged.

[0014] In one embodiment of this utility model, the protrusion is configured as a cylinder, and the end of the cylinder is provided with a chamfer.

[0015] In one embodiment of this utility model, the assembly hole is configured as a through hole or a blind hole.

[0016] In one embodiment of the present invention, the cooling fan further includes a reinforcing ring coaxially disposed with the mounting base ring, the reinforcing ring being connected to the mounting base ring by reinforcing ribs, and the reinforcing ring having a plurality of fan blades evenly distributed along its circumference.

[0017] In one embodiment of this utility model, the diameter of the reinforcing ring is larger than the diameter of the mounting base ring.

[0018] In one embodiment of this utility model, the rotor core body is coaxially connected to the rotating shaft, and the rotating shaft is coaxially connected to the support ring body.

[0019] In one embodiment of this utility model, the diameter of the cylinder is equal to the cross-sectional width of the mounting base ring.

[0020] An electric motor comprising the aforementioned DC brushed motor rotor cooling fan assembly.

[0021] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0022] The DC brushed motor rotor cooling fan assembly of this utility model achieves a fixed connection between the rotor core and the cooling fan by setting protrusions on the cooling fan and pressing the protrusions into the assembly holes on the end face of the rotor core. This replaces the traditional adhesive bonding process, improves the positioning accuracy and connection strength of the cooling fan, simplifies the assembly process of the cooling fan, and reduces the assembly cost. Multiple protrusions are evenly distributed along the circumference of the mounting base ring, which can improve the concentricity of the cooling fan and the rotor core, thereby reducing the noise and vibration of the cooling fan. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of the DC brushed motor rotor cooling fan assembly in a preferred embodiment of the present invention;

[0025] Figure 2 for Figure 1 The exploded view of the rotor cooling fan assembly of the DC brushed motor shown.

[0026] Figure 3 for Figure 2 The diagram shows the structure of the cooling fan.

[0027] Figure 4 for Figure 2 The diagram shows the structure of the rotor core.

[0028] Figure 5 for Figure 2 The diagram shows the structure of the support ring.

[0029] Explanation of reference numerals in the accompanying drawings: 1. Rotor core; 11. Rotor core body; 12. Tooth; 13. Assembly hole; 14. Tooth blade; 2. Cooling fan; 21. Mounting base ring; 211. Chamfer; 22. Protrusion; 23. Reinforcing ring; 24. Reinforcing rib; 25. Fan blade; 3. Support ring; 31. Support ring body; 32. Arm body; 33. Connecting hole; 4. Shaft. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. Example

[0031] Reference Figure 1 , Figure 3 and Figure 4As shown, in one embodiment of this utility model, a DC brushed motor rotor cooling fan assembly is disclosed, comprising:

[0032] The rotor core 1 has multiple mounting holes 13 on its end face;

[0033] The cooling fan 2 includes a mounting base ring 21, which has a plurality of protrusions 22 evenly distributed along its circumference. The mounting holes 13 are conformally matched with the protrusions 22, and the plurality of protrusions 22 are respectively inserted into the plurality of mounting holes 13, and the mounting holes 13 and the protrusions 22 are interference-fitted.

[0034] The DC brushed motor rotor cooling fan assembly described in this embodiment achieves a fixed connection between the rotor core 1 and the cooling fan 2 by setting protrusions 22 on the cooling fan 2 and pressing the protrusions 22 into the assembly holes 13 on the end face of the rotor core 1. This replaces the traditional adhesive bonding process, improves the positioning accuracy and connection strength of the cooling fan 2, simplifies the assembly process of the cooling fan 2, and reduces the assembly cost. Multiple protrusions 22 are evenly distributed around the circumference of the mounting base ring 21, which can improve the concentricity between the cooling fan 2 and the rotor core 1, thereby reducing the noise and vibration of the cooling fan 2. When pressing the cooling fan 2, the protrusions 22 are pressed into the assembly holes 13 located on the teeth 12. The protrusions 22 can avoid the rotor slots and enameled wires, avoiding the problem that the protrusions 22 cannot be inserted into the assembly holes 13.

[0035] In one embodiment of this utility model, the rotor core 1 is wound with enameled wire.

[0036] Reference Figure 4 As shown, in one embodiment of this utility model, the 12 assembly holes 13 are distributed in a ring around the center of the end face and are symmetrically arranged about the center of the end face. The symmetrical layout can enhance the dynamic balance of the rotor core 1 and reduce the sway caused by centrifugal force.

[0037] Reference Figure 4 As shown, in one embodiment of this utility model, the rotor core 1 includes a rotor core body 11 and 12 teeth 12 extending radially along the rotor core body 11. The rotor core body 11 is coaxially connected to the motor shaft 4. The 12 teeth 12 are evenly distributed circumferentially along the rotor core body 11. The teeth 12 provide mechanical support for the enameled wire winding. The end face of the tooth 12 furthest from the rotor core body 11 is provided with the mounting hole 13, which helps the mounting hole 13 to avoid the enameled wire winding and ensures that the protrusion 22 is fully inserted into the mounting hole 13 without interfering with the enameled wire.

[0038] Reference Figure 4As shown, in one embodiment of this utility model, the tooth 12 is provided with an arc-shaped tooth wing 14 at the end furthest from the rotor core body 11. The width of the tooth wing 14 is greater than the width of the tooth 12. The width refers to the length along the circumference of the mounting base ring 21. The tooth wing 14 is used to limit the enameled wire winding. The end face of the tooth wing 14 is provided with the mounting hole 13. When the protrusion 22 is pressed into the mounting hole 13, the mounting base ring 21 abuts against the tooth wing 14 along its axial direction. The tooth wing 14 is used to provide a complete support surface for the mounting base ring 21, which is beneficial for the mounting base ring 21 to avoid the enameled wire winding.

[0039] Reference Figure 2 and Figure 5 As shown, in one embodiment of this utility model, a support ring 3 is further included, which is embedded inside the mounting base ring 21. The support ring 3 is used to provide radial support for the mounting base ring 21. The support ring 3 includes a support ring body 31 and a plurality of arms 32 extending radially along the support ring body 31. The support ring body 31 is coaxially arranged with the mounting base ring 21. The plurality of arms 32 are evenly distributed circumferentially along the support ring body 31. The arms 32 abut against the inner wall of the mounting base ring 21. The arms 32 are used to support the mounting base ring 21 radially, which helps to enhance the deformation resistance of the mounting base ring 21 and prevent the fan blades 25 from shaking during high-speed rotation.

[0040] Reference Figure 5 As shown, in one embodiment of the present invention, the support ring body 31 is provided with a connecting hole 33 at its center, and the support ring body 31 is connected to the motor shaft 4 through the connecting hole 33.

[0041] Reference Figure 2 As shown, in one embodiment of the present invention, a protrusion 22 is disposed at the end of the mounting base ring 21 facing the rotor core 1.

[0042] Reference Figure 2 As shown, in one embodiment of this utility model, multiple arm bodies 32 and multiple teeth 12 are arranged facing each other along the axis of the mounting base ring 21, which can reduce the resistance of the arm bodies 32 and the mounting base ring 21 to airflow and improve the heat dissipation efficiency of the rotor core 1.

[0043] Reference Figure 1 As shown, in one embodiment of this utility model, the diameter of the rotor core 1 is equal to the diameter of the mounting base ring 21. The equal diameter design can reduce assembly eccentricity. The rotor core 1 and the mounting base ring 21 are coaxially arranged to avoid additional aerodynamic noise caused by the rotor core 1 and the cooling fan 2 not being concentric.

[0044] Reference Figure 3As shown, in one embodiment of the present invention, the protrusion 22 is configured as a cylinder, and the end of the cylinder is provided with a chamfer 211, which facilitates the guidance of the protrusion 22 during assembly.

[0045] In one embodiment of this utility model, the assembly hole 13 is configured as a through hole. When the protrusion 22 is pressed into one end of the through hole, the gas in the through hole can be discharged from the other end, ensuring that the interference fit is in place. In another embodiment, the assembly hole 13 can be configured as a blind hole, and an air gap for venting is opened on the peripheral side of the protrusion 22.

[0046] Reference Figure 4 As shown, in one embodiment of the present invention, the cooling fan 2 further includes a reinforcing ring 23 coaxially arranged with the mounting base ring 21. The reinforcing ring 23 is connected to the mounting base ring 21 by reinforcing ribs 24. The reinforcing ring 23 is provided with a plurality of fan blades 25 evenly distributed along its circumference. After the cooling fan 2 rotates, the airflow generated by the plurality of fan blades 25 blows towards the rotor core 1.

[0047] Furthermore, the diameter of the reinforcing ring 23 is larger than the diameter of the mounting base ring 21.

[0048] In one embodiment of this utility model, the rotor core body 11 is coaxially connected to the motor shaft 4, and the motor shaft 4 is coaxially connected to the support ring body 31.

[0049] Reference Figure 4 As shown, in one embodiment of this utility model, the diameter of the cylinder is equal to the cross-sectional width of the mounting base ring 21.

[0050] In one embodiment of this utility model, the protrusion 22 has a length of 2mm and a diameter of 1.9mm, and the mounting hole 13 has a diameter of 1.95mm; the outer side of the top of the cylinder is provided with a chamfer 211 of C0.3mm. Example

[0051] An electric motor includes the aforementioned DC brushed motor rotor cooling fan assembly. The motor also includes a stator that generates a fixed magnetic field through current, and a rotor core 1 and enameled wire winding that generate a rotating magnetic field through current, the two interacting to generate electromagnetic torque.

[0052] The working principle of the DC brushed motor rotor cooling fan assembly described in this utility model is as follows:

[0053] During assembly, the cooling fan 2 and the rotor core 1 are positioned using a positioning fixture to ensure that the cooling fan 2 and the rotor core 1 are coaxial and that the protrusion 22 is aligned with the mounting hole 13. Then, the protrusion 22 is pressed into the mounting hole 13 using a press, so that the mounting base ring 21 is pressed onto the end face of the rotor core 1. Then, the support ring 3 is put on the rotating shaft 4 and pressed into the mounting base ring 21 to complete the assembly. When the rotor core 1 rotates, the cooling fan 2 rotates with the rotor core 1 and blows the airflow toward the rotor core 1 for heat dissipation.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A DC brushed motor rotor cooling fan assembly, characterized in that, include, The rotor core has multiple assembly holes on its end face; A cooling fan includes a mounting base ring having a plurality of protrusions evenly distributed along its circumference, mounting holes conforming to the protrusions, the plurality of protrusions being respectively inserted into the plurality of mounting holes, and the mounting holes and protrusions being interference-fitted.

2. The DC brushed motor rotor cooling fan assembly according to claim 1, characterized in that, The plurality of mounting holes are distributed in a ring around the center of the end face and are arranged symmetrically about the center of the end face.

3. The DC brushed motor rotor cooling fan assembly according to claim 1, characterized in that, The rotor core includes a rotor core body and a plurality of teeth extending radially along the rotor core body. The plurality of teeth are evenly distributed circumferentially along the rotor core body, and the mounting hole is provided at the end of the tooth furthest from the rotor core body.

4. The DC brushed motor rotor cooling fan assembly according to claim 3, characterized in that, The tooth is provided with a tooth wing at the end furthest from the rotor core body. The width of the tooth wing is greater than the width of the tooth, and the tooth wing is provided with the mounting hole.

5. The DC brushed motor rotor cooling fan assembly according to claim 4, characterized in that, The mounting base ring abuts against the toothed wing along its axial direction.

6. The DC brushed motor rotor cooling fan assembly according to claim 3, characterized in that, It also includes a support ring embedded inside the mounting base ring. The support ring includes a support ring body and a plurality of arms extending radially along the support ring body. The support ring body is coaxially arranged with the mounting base ring. The plurality of arms are evenly distributed circumferentially along the support ring body. The arms abut against the inner wall of the mounting base ring. The plurality of arms and the plurality of teeth are arranged one-to-one opposite each other along the axis of the mounting base ring.

7. The DC brushed motor rotor cooling fan assembly according to claim 1, characterized in that, The diameter of the rotor core is equal to the diameter of the mounting base ring, and the rotor core and the mounting base ring are coaxially arranged.

8. The DC brushed motor rotor cooling fan assembly according to claim 1, characterized in that, The protrusion is configured as a cylinder, and the end of the cylinder is chamfered.

9. The DC brushed motor rotor cooling fan assembly according to claim 1, characterized in that, The assembly holes are configured as through holes or blind holes.

10. An electric motor, characterized in that, Includes the DC brushed motor rotor cooling fan assembly as described in any one of claims 1-9.

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