Self-locking structure of special fan for motor

Abstract

A self-locking structure of a fan special for a motor comprises a fan and a motor shaft matched with the fan, the fan comprises a mounting shaft sleeve and fan blades distributed on the periphery of the mounting shaft sleeve, the motor shaft comprises a fan connecting part located at the end, and the mounting shaft sleeve is connected with the fan connecting part in a matched mode. The fan is characterized in that the installation shaft sleeve is provided with a rotation limiting clamping protrusion and an axial limiting clamping protrusion which protrude towards the inner hole direction, the fan connecting part is provided with a rotation limiting groove and an axial limiting groove, and the rotation limiting clamping protrusion can be clamped into the rotation limiting groove to limit rotation of the fan in the circumferential direction; the axial limiting clamping protrusions can be clamped into the axial limiting grooves to limit the axial movement of the fan. After the mounting shaft sleeve is inserted into the fan connecting part, the fan is fixed relative to the motor shaft; the self-locking connection mode does not need other mounting parts and mounting steps, so that the mounting and dismounting efficiency is greatly improved, and the operation efficiency of the motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of motors, and more specifically to a self-locking structure for a dedicated fan for electric motors. Background Technology

[0002] The primary function of a motor fan is to increase airflow, promote heat dissipation from the outer surface of the motor housing, and reduce the motor's temperature rise. Motor fans are typically made of injection-molded nylon 6, formed in a single process using molds according to requirements, resulting in high production efficiency and good product stability. Nylon 6 is a polyamide material with excellent wear resistance; it is a translucent or opaque milky-white crystalline polymer with thermoplasticity, lightweight, good toughness, chemical resistance, and durability, meeting the requirements of motors under various operating conditions. Due to its good wear resistance, self-lubricating properties, and solvent resistance, coupled with low cost, it is an excellent material for manufacturing high-efficiency motor fans. Common motor fans are mounted on the motor shaft at the rear of the motor, enclosed by a fan cover, and fixed to the motor housing. Air is drawn in through the fan cover's holes and dissipated through the surface of the housing, requiring no external power supply for cooling. Currently, the installation of the motor fan and motor shaft usually requires fasteners for locking, and the degree of freedom is restricted by keys, pins, and other parts, making installation and disassembly complex and increasing the motor's weight, thus reducing its operating efficiency. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a self-locking structure for a dedicated electric motor fan. This self-locking structure incorporates a rotational limiting protrusion and an axial limiting protrusion within the fan's mounting bushing, and corresponding rotational limiting grooves and axial limiting grooves are formed at the fan connection portion of the motor shaft. When the mounting bushing is inserted into the fan connection portion, the rotational limiting protrusion and the rotational limiting groove engage to restrict circumferential rotation, while the axial limiting protrusion and the axial limiting groove engage to restrict axial movement, thus fixing the fan relative to the motor shaft. This self-locking connection eliminates the need for additional mounting parts and steps, significantly improving installation and disassembly efficiency, and also enhancing the operating efficiency of the electric motor.

[0004] The specific technical solution of this utility model is as follows: A self-locking structure for a dedicated electric motor fan, comprising a fan and a motor shaft cooperating with the fan, the fan comprising a mounting bushing and fan blades distributed around the periphery of the mounting bushing, the motor shaft comprising a fan connecting portion located at the end, the mounting bushing cooperating with the fan connecting portion, characterized in that: the mounting bushing is provided with a rotation limiting protrusion and an axial limiting protrusion protruding inwards, the fan connecting portion is provided with a rotation limiting groove and an axial limiting groove, the rotation limiting protrusion being able to engage with the rotation limiting groove to limit the circumferential rotation of the fan, and the axial limiting protrusion being able to engage with the axial limiting groove to limit the axial movement of the fan.

[0005] As a preferred embodiment of the present invention, the mounting bushing is composed of a bushing body and a bushing segment in the axial direction, and the bushing segment has at least two segments in the circumferential direction, so that it has radial elastic deformation.

[0006] As a preferred embodiment of this utility model, the axial limiting protrusion is located within the area of ​​the bushing segment and extends circumferentially within the bushing segment.

[0007] As a preferred embodiment of this invention, the axial limiting protrusion is located at the end of the bushing segment that is away from the bushing body.

[0008] As a preferred embodiment of this utility model, the axial limiting groove is an annular groove located on the outer circular surface of the fan connection part, and the groove width covers the range of the axial limiting protrusion; the axial limiting protrusion is a transition surface on the front side of the mounting bushing insertion direction, and the axial limiting protrusion is a blocking surface on the rear side of the mounting bushing insertion direction.

[0009] As a preferred embodiment of this utility model, at least a portion of the rotation limiting protrusion is located within the range of the main body of the bushing, and extends along the axial direction within the mounting bushing.

[0010] As a preferred embodiment of this utility model, the rotation limiting groove is a straight groove located on the outer circular surface of the fan connection part, and extends axially along the motor shaft to the end face of the fan connection part.

[0011] As a preferred embodiment of this invention, the included angle α between the transition surface and the inner wall of the mounting bushing is 10°-60°, and the included angle β between the blocking surface and the inner wall of the mounting bushing is 65°-105°.

[0012] As a preferred embodiment of this invention, the blocking surface is flush with the end face of the mounting bushing.

[0013] In summary, this utility model has the following beneficial effects:

[0014] The self-locking structure of this utility model's dedicated electric motor fan features a rotational limiting protrusion and an axial limiting protrusion within the mounting bushing of the electric motor fan. Corresponding rotational limiting grooves and axial limiting grooves are also provided at the fan connection portion of the motor shaft. After the mounting bushing is inserted into the fan connection portion, the rotational limiting protrusion and the rotational limiting groove engage to restrict the degree of freedom of rotation in the circumferential direction, while the axial limiting protrusion and the axial limiting groove engage to restrict the degree of freedom of movement in the axial direction, thereby fixing the fan relative to the motor shaft. This self-locking connection method eliminates the need for other mounting parts and steps, greatly improving the efficiency of installation and disassembly, and also enhancing the operating efficiency of the electric motor. Attached Figure Description

[0015] Figure 1 This is an axial view of the self-locking structure of the electric motor-specific fan of this utility model in its installation state.

[0016] Figure 2 This is a schematic diagram of the self-locking structure of the motor shaft at the fan connection part of the electric motor-specific fan of this utility model.

[0017] Figure 3 This utility model relates to a self-locking structure for a dedicated electric motor fan. Figure 1 AA section view in the middle;

[0018] Figure 4 This utility model relates to a self-locking structure for a dedicated electric motor fan. Figure 1 BB section view in the middle;

[0019] Figure 5 This utility model relates to a self-locking structure for a dedicated electric motor fan. Figure 4 A partially enlarged view of one embodiment at point C;

[0020] Figure 6 This utility model relates to a self-locking structure for a dedicated electric motor fan. Figure 4 A partially enlarged view of one embodiment at point C;

[0021] Figure 7 This utility model relates to a self-locking structure for a dedicated electric motor fan. Figure 4 A partially enlarged view of one embodiment at point C;

[0022] Figure 8 This utility model relates to a self-locking structure for a dedicated electric motor fan. Figure 4 A partially enlarged view of one embodiment at point C;

[0023] Figure 9 This utility model relates to a self-locking structure for a dedicated electric motor fan. Figure 4 A partially enlarged view of one embodiment at point C;

[0024] In the figure, 1-fan, 11-mounting bushing, 111-rotation limit bracket protrusion, 112-axial limit bracket protrusion, 1121-transition surface, 1122-blocking surface, 11a-main body of bushing, 11b-split part of bushing, 12-fan blade, 2-motor shaft, 21-fan connecting part, 211-rotation limit groove, 212-axial limit groove. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 A self-locking structure for a dedicated electric motor fan includes a fan 1 and a motor shaft 2 that cooperates with the fan 1. The fan 1 includes a mounting sleeve 11 and fan blades 12 distributed around the mounting sleeve 11. The motor shaft 2 includes a fan connecting part 21 located at the end. The mounting sleeve 11 is connected to the fan connecting part 21. The characteristic feature is that the mounting sleeve 11 is provided with a rotation limiting protrusion 111 and an axial limiting protrusion 112 protruding inward towards the inner hole. The fan connecting part 21 is provided with a rotation limiting groove 211 and an axial limiting groove 212. The rotation limiting protrusion 111 can be engaged with the rotation limiting groove 211 to limit the rotation of the fan 1 in the circumferential direction. The axial limiting protrusion 112 can be engaged with the axial limiting groove 212 to limit the axial movement of the fan 1.

[0027] After the bushing 11 is inserted into the fan connecting part 21, the rotation limit protrusion 111 and the rotation limit groove 211 cooperate to restrict the degree of freedom of rotation in the circumferential direction, and the axial limit protrusion 112 and the axial limit groove 212 cooperate to restrict the degree of freedom of axial movement, thereby fixing the fan 1 relative to the motor shaft 2. This self-locking connection method does not require other installation parts and installation steps, which greatly improves the efficiency of installation and disassembly.

[0028] like Figure 3 , Figure 4 The mounting bushing 11 is composed of a bushing body 11a and a bushing segment 11b in the axial direction. The bushing segment 11b has at least two segments in the circumferential direction, which enables it to have radial elastic deformation.

[0029] The bushing split section 11b is integrally connected to the bushing body section 11a. The bushing split section 11b is formed by the bushing 11 having several axially extending slits on its circumference, so that it has radial elastic deformation after splitting, so that the apex of the axial limiting protrusion 112 can move to the outer surface of the fan connection section 21 and be engaged in the axial limiting groove 212.

[0030] like Figure 4The axial limiting protrusion 112 is located within the area of ​​the bushing segment 11b and extends circumferentially within the bushing segment 11b.

[0031] The axial limiting protrusion 112 is located within the area of ​​the bushing segment 11b, which allows it to have elastic deformation so that it can be engaged in the axial limiting groove 212. The axial limiting protrusion 112 extends in the circumferential direction within the bushing segment 11b, which makes the engagement effect better.

[0032] like Figures 4-9 The axial limiting protrusion 112 is located at the end of the bushing split portion 11b away from the bushing body portion 11a.

[0033] The axial limiting protrusion 112 is located at the end of the bushing split 11b away from the bushing body 11a, which allows it to have a larger elastic deformation and makes it easier to assemble and engage with the fan connection part 21.

[0034] like Figure 2 , Figures 4-9 The axial limiting groove 212 is an annular groove located on the outer circular surface of the fan connection part 21, and the groove width covers the range of the axial limiting protrusion 112. The axial limiting protrusion 112 is a transition surface 1121 on the front side of the mounting bushing 11 in the insertion direction, and a blocking surface 1122 on the rear side of the mounting bushing 11 in the insertion direction.

[0035] The transition surface 1121 can provide the opening force of the bushing split portion 11b during the installation of the bushing 11 to the fan connection portion 21, so that the axial limiting protrusion 112 can be engaged in the axial limiting groove 212; the blocking surface 1122 can provide the blocking force between the axial limiting protrusion 112 and the side wall of the axial limiting groove 212 when the axial limiting protrusion 112 is engaged in the axial limiting groove 212, so as to prevent the bushing 11 from easily coming out.

[0036] like Figure 2 , Figure 3 The rotation limit protrusion 111 is at least partially located within the range of the bushing body 11a, and extends along the axial direction within the mounting bushing 11.

[0037] The rotation limit protrusion 111 is located at least partly within the range of the bushing body 11a, which can prevent it from being affected by elastic deformation, resulting in better strength and more stable engagement.

[0038] like Figure 2 , Figure 3 The rotation limiting groove 211 is a straight groove located on the outer circular surface of the fan connection part 21, and extends through the motor shaft 2 axially to the end face of the fan connection part 21.

[0039] Both the rotation limiting protrusion 111 and the rotation limiting groove 211 extend axially, and the rotation limiting groove 211 extends to the end face of the fan connection part 21, so that the rotation limiting protrusion 111 can move axially from the end face of the fan connection part 21 along the motor shaft 2 and engage with the rotation limiting groove 211.

[0040] like Figure 5 , Figure 6 , Figure 7 The included angle α between the transition surface 1121 and the inner wall of the mounting bushing 11 is 10°-60°, and the included angle β between the blocking surface 1122 and the inner wall of the mounting bushing 11 is 65°-105°.

[0041] The smaller the angle α between the transition surface 1121 and the inner wall of the mounting bushing 11, the easier it is to engage. However, the width occupied by the axial limiting protrusion 112 is also larger, and the width of the axial limiting groove 212 needs to be wider. Usually, 30°≤α≤45° is more appropriate.

[0042] like Figure 5 As an example, the angle β between the blocking surface 1122 and the inner wall of the mounting sleeve 11 is a 90° right angle, which can ensure that the sleeve will not come out after engagement.

[0043] like Figure 6 As an example, when 65°≤β<90°, applying a certain axial pull-out force can cause the axial limiting protrusion 112 to disengage from the axial limiting groove 212, making the disassembly of the fan 1 more convenient.

[0044] like Figure 7 As an example, when 90°<β≤105°, the blocking surface 1122 engages with the side of the axial limiting groove 212, making the engagement between the axial limiting protrusion 112 and the axial limiting groove 212 more secure.

[0045] like Figure 5 , Figure 8 , Figure 9 The blocking surface 1122 is flush with the end face of the mounting bushing 11.

[0046] The fact that the blocking surface 1122 is flush with the end face of the mounting bushing 11 makes the axial limiting protrusion 112 structure more stable.

[0047] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A self-locking structure for a dedicated electric motor fan, comprising a fan (1) and a motor shaft (2) cooperating with the fan (1), wherein the fan (1) includes a mounting bushing (11) and fan blades (12) distributed around the mounting bushing (11), and the motor shaft (2) includes a fan connecting part (21) located at the end, wherein the mounting bushing (11) is cooperating with the fan connecting part (21), characterized in that: The mounting bushing (11) is provided with a rotation limiting protrusion (111) and an axial limiting protrusion (112) protruding inward. The fan connecting part (21) is provided with a rotation limiting groove (211) and an axial limiting groove (212). The rotation limiting protrusion (111) can be engaged in the rotation limiting groove (211) to limit the rotation of the fan (1) in the circumferential direction. The axial limiting protrusion (112) can be engaged in the axial limiting groove (212) to limit the axial movement of the fan (1).

2. The self-locking structure of the electric motor-specific fan according to claim 1, characterized in that: The mounting bushing (11) is composed of a bushing body (11a) and a bushing segment (11b) in the axial direction. The bushing segment (11b) has at least two segments in the circumferential direction, which gives it radial elastic deformation.

3. The self-locking structure of the electric motor-specific fan according to claim 2, characterized in that: The axial limiting protrusion (112) is located within the area of ​​the bushing segment (11b) and extends circumferentially within the bushing segment (11b).

4. The self-locking structure of the electric motor-specific fan according to claim 3, characterized in that: The axial limiting protrusion (112) is located at the end of the bushing split portion (11b) away from the bushing body portion (11a).

5. The self-locking structure of the electric motor-specific fan according to claim 4, characterized in that: The axial limiting groove (212) is an annular groove located on the outer circular surface of the fan connection part (21), and the groove width covers the range of the axial limiting protrusion (112); the axial limiting protrusion (112) is a transition surface (1121) on the front side of the mounting bushing (11) in the insertion direction, and the axial limiting protrusion (112) is a blocking surface (1122) on the rear side of the mounting bushing (11) in the insertion direction.

6. The self-locking structure of the electric motor-specific fan according to claim 2, characterized in that: The rotation limiting protrusion (111) is at least partially located within the range of the main body (11a) of the bushing, and extends along the axial direction within the mounting bushing (11).

7. The self-locking structure of the electric motor-specific fan according to claim 6, characterized in that: The rotation limiting groove (211) is a straight groove located on the outer circular surface of the fan connecting part (21), and extends along the axial direction of the motor shaft (2) to the end face of the fan connecting part (21).

8. The self-locking structure of the electric motor-specific fan according to claim 5, characterized in that: The included angle α between the transition surface (1121) and the inner wall of the mounting bushing (11) is 10°-60°, and the included angle β between the blocking surface (1122) and the inner wall of the mounting bushing (11) is 65°-105°.

9. The self-locking structure of the electric motor-specific fan according to claim 5, characterized in that: The blocking surface (1122) is flush with the end face of the mounting bushing (11).

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