Pressure-controllable fan upper bearing press-in device

Abstract

The utility model relates to a pressure-controllable press-in device for an upper bearing of a fan, and solves the problems that the instantaneous pressure is too large and the upper bearing is damaged due to the excessive instantaneous pressure in the press-in process of the upper bearing from top to bottom in the assembly process of the fan. The device comprises a tool body, a guide column for guiding a stator assembly is arranged in the middle of the upper surface of the tool body, a hole is formed in the middle of the guide column, an elastic positioning column is arranged in the hole in a penetrating mode, a jacking spring is arranged between the outer side of the elastic positioning column and the tool body, and an upper bearing positioning seat is arranged at the top of the elastic positioning column; and the elastic positioning column is provided with an elastic check ring positioning groove below the upper bearing positioning seat. According to the utility model, an inverted press-in mode of the rotor assembly and the stator assembly is adopted, the positioning is accurate, press-in limiting is carried out, the press-in force of the upper bearing is controllable, the maximum pressure is the sum of friction forces of the upper bearing, the stator assembly and the rotor shaft, and the condition that the upper bearing is crushed due to excessive instantaneous press-in force is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of tooling and relates to an assembly tooling for a fan stator and rotor, and particularly to a pressure-controllable bearing pressing device for a fan. Background Technology

[0002] The stator of the fan acts as the driving component, and the rotor as the driven component. Alternating current flows through the stator coils, creating a periodically changing magnetic field that drives the rotor to rotate. Due to the high-speed relative rotation between the stator and rotor, upper and lower bearings are installed between them. The rotor assembly has a rotor shaft passing through the middle of the stator. The upper and lower bearings are assembled between the rotor shaft and the stator assembly, typically using a press-fit method. The lower bearing is first assembled with the rotor shaft and then pressed into the stator. The upper bearing, however, is assembled after the stator and rotor are positioned and then pressed between the stator and rotor shaft. Because of the large overall mass of the fan, the traditional assembly method involves placing the fan rotor and stator assembly on an installation platform and then using a push rod to press the upper bearing downwards. However, the frictional forces that each upper bearing needs to overcome during pressing are not entirely the same due to machining precision limitations. Furthermore, there are issues with the positioning of the upper bearing relative to the push rod when pressing it downwards. Therefore, occasionally, excessive instantaneous pressure from the push rod can damage the upper bearing, leading to rework or even the scrapping of the component. Utility Model Content

[0003] The purpose of this invention is to solve the problem of excessive instantaneous pressure during the top-to-bottom pressing of the upper bearing in the assembly process of a fan, which can lead to damage to the upper bearing due to excessive instantaneous pressure. This invention provides a fan upper bearing pressing device with controllable pressure. It employs an inverted pressing method, with the upper bearing at the bottom and the fan rotor and stator assembly at the top. An elastic positioning column precisely positions the upper bearing and provides precise positioning and guidance for the stator assembly during pressing, achieving accurate positioning of the upper bearing. Furthermore, a tooling operating table limits the downward pressing position of the stator assembly, preventing excessive force on the upper bearing from causing damage.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a pressure-controllable fan bearing pressing device, including a tooling body, a guide post for guiding the stator assembly is provided in the middle of the upper surface of the tooling body, the guide post has a hole in the middle and an elastic positioning post is inserted through it, a lifting spring is provided between the outer side of the elastic positioning post and the tooling body, an upper bearing positioning seat is provided at the top of the elastic positioning post, and an elastic retaining ring positioning groove is provided below the upper bearing positioning seat on the elastic positioning post.

[0005] This device employs an inverted installation, with the stator and rotor assemblies facing downwards and the upper bearing positioned below. The upper bearing is pressed in inverted positions. The top of the elastic positioning post precisely positions the upper bearing and its associated elastic retaining ring. A guide post precisely guides the pressing stator assembly. The rotor shaft of the rotor assembly is inserted downwards from the center of the upper bearing, compressing the elastic positioning post. Once the upper bearing and elastic retaining ring reach the top surface of the guide post, they are then supported by the top surface of the guide post. The rotor shaft continues to press downwards, compressing the elastic positioning post and disengaging it from the upper bearing and elastic retaining ring until it reaches the limiting step on the stator. At this point, the upper bearing and elastic retaining ring are fully pressed in, completing the installation. During assembly, the upper bearing, elastic retaining ring, stator assembly, and rotor assembly are precisely positioned, reducing deviations. Furthermore, the stator assembly is simultaneously pressed down and limited after the upper bearing is fully inserted, avoiding the problem of excessive instantaneous pressure during the pressing process of traditional push-rod pressing, which could damage the upper bearing. Meanwhile, this device can complete the simultaneous pressing of the upper bearing and the elastic retaining ring in one process, reducing the number of processes and improving efficiency.

[0006] Both the rotor and stator assemblies of this device have precise guidance. Therefore, if necessary, the pressing of the lower bearing can also be completed simultaneously in this device. Since the lower bearing and the rotor shaft are pre-assembled, the pressing can be completed by overcoming the friction between the lower bearing and the stator assembly. The pressing force is less than that of the upper bearing. Therefore, during the overall pressing process, as the downward pressure is applied, the lower bearing is pressed in first, and then the upper bearing is pressed in.

[0007] Preferably, the upper surface of the tooling body is a tooling operating table, and the tooling operating table is provided with a limiting step around its circumference to limit the downward movement of the stator assembly. The height difference between the limiting step and the top surface of the guide column is the height difference between the stator assembly and the upper bearing after assembly.

[0008] Preferably, the tooling body includes an upper platform and a lower platform, the elastic positioning column is provided with an annular protrusion in the middle, the lifting spring is disposed between the annular protrusion and the lower platform, and the annular protrusion and the bottom surface of the upper platform form a lifting limit.

[0009] Preferably, the lower platform has an opening in the middle, and a cable tray is provided above the opening in the middle of the lower platform. The cable tray has openings corresponding to the elastic positioning posts, and the lower end of the lifting spring abuts against the upper surface of the cable tray.

[0010] Preferably, the bottom surface of the upper platform is provided with guide grooves corresponding to the annular convex edge of the elastic positioning post.

[0011] Preferably, a support column is provided between the upper platform and the lower platform, and the fixing bolts pass through the lower platform and the support column from bottom to top and are then fixed to the screw holes on the bottom surface of the upper platform.

[0012] Preferably, a rotor assembly is provided on the outside of the stator assembly. The rotor assembly includes a rotor shaft passing through the center of the stator assembly. A lower bearing is provided between the lower end of the rotor shaft and the stator assembly, and an upper bearing is provided between the upper end of the rotor shaft and the stator assembly. The rotor assembly and the stator assembly are installed in an inverted press-fit configuration with their upper surfaces facing down.

[0013] This invention employs an inverted pressing method for the rotor and stator assemblies, ensuring precise positioning and limiting the pressing force. The pressing force of the upper bearing is controllable, with the maximum pressure being the sum of the frictional forces between the upper bearing and the stator assembly and rotor shaft. This avoids the situation where the upper bearing is damaged due to excessive instantaneous pressing force. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a structural schematic diagram of the present invention in its pre-pressing state.

[0016] Figure 2 This is a schematic diagram of the structure of this utility model after it has been pressed in.

[0017] In the diagram: 1. Tooling body, 2. Upper platform, 3. Lower platform, 4. Support column, 5. Cable tray, 6. Guide column, 7. Limiting step, 8. Elastic positioning column, 9. Annular protrusion, 10. Lifting spring, 11. Elastic retaining ring, 12. Upper bearing, 13. Stator assembly, 14. Rotor assembly, 15. Rotor shaft, 16. Lower bearing. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0019] Example: A pressure-controllable bearing pressing device for a fan, such as... Figure 1 , 2As shown. This device includes a tooling body 1, which includes an upper platform 2 and a lower platform 3. A support column 4 is provided between the upper and lower platforms. Fixing bolts pass through the lower platform and the support column from bottom to top and are then fixed to the bottom screw holes of the upper platform. A guide column 6 for guiding the stator assembly is provided in the middle of the upper surface of the upper platform 2. The guide column has a hole in the middle and an elastic positioning column 8 passes through it. An annular protrusion 9 is provided in the middle of the elastic positioning column 8. The lower platform 3 has a hole in the middle, and a cable tray 5 is provided above the hole in the middle of the lower platform 3. The cable tray has holes corresponding to the elastic positioning columns. A lifting spring 10 is provided between the lower part of the annular protrusion 9 of the elastic positioning column 8 and the upper surface of the cable tray. The annular protrusion 9 forms a lifting limit with the bottom surface of the upper platform 2. A guide groove is provided on the bottom surface of the upper platform corresponding to the annular protrusion of the elastic positioning column. The annular protrusion 9 slides up and down inside the guide groove.

[0020] The top of the elastic positioning post 8 is provided with an upper bearing positioning seat, and the elastic positioning post is provided with an elastic retaining ring positioning groove below the upper bearing positioning seat. During pressing and positioning, the elastic retaining ring is positioned in the middle of the elastic positioning post, and the circumference of the elastic retaining ring protrudes from the circumference of the elastic positioning post. The upper bearing is located above the elastic retaining ring and is accurately positioned by the upper bearing positioning seat. The elastic positioning post 8 positions the hollow part of the upper bearing, and the outer diameter of the upper bearing is larger than the outer diameter of the elastic positioning post 8.

[0021] The upper surface of the upper platform is a tooling operating table. The tooling operating table is provided with a limiting step 7 around its circumference to press down and limit the stator assembly. The height difference between the limiting step and the top surface of the guide column 6 is the height difference after the stator assembly and the upper bearing are assembled.

[0022] A rotor assembly 14 is disposed on the outside of the stator assembly 13. The rotor assembly includes a rotor shaft 15 passing through the center of the stator assembly. A lower bearing 16 is disposed between the lower end of the rotor shaft and the stator assembly. An upper bearing is disposed between the upper end of the rotor shaft and the stator assembly. The rotor assembly and the stator assembly are installed in an inverted press-fit configuration with the upper surface facing down.

[0023] like Figures 1 to 2As shown in the state change diagram, this device adopts an inverted installation, that is, the upper ends of the stator assembly and rotor assembly face downwards, and the upper bearing is positioned below, using an inverted pressing method. The top of the elastic positioning column precisely positions the upper bearing and its attached elastic retaining ring. The guide column precisely guides the pressing stator assembly. The rotor shaft of the rotor assembly is inserted downwards from the center of the upper bearing, compressing the elastic positioning column. After the upper bearing and elastic retaining ring reach the position of the top surface of the guide column, the upper bearing and elastic retaining ring are switched to being supported by the top surface of the guide column. The rotor shaft continues to press down, compressing the elastic positioning column downwards and disengaging it from the upper bearing and elastic retaining ring until it is pressed down to the stator and contacts the limiting step. Then, the upper bearing and elastic retaining ring are pressed into place, completing the installation. During the assembly process, the upper bearing, elastic retaining ring, stator assembly, and rotor assembly are precisely positioned, reducing deviations. Moreover, after the upper bearing is pressed into place, the stator assembly is also simultaneously pressed down and limited, avoiding the problem of excessive instantaneous pressure during the pressing process of traditional push rod pressing, and preventing damage to the upper bearing. Meanwhile, this device can complete the simultaneous pressing of the upper bearing and the elastic retaining ring in one process, reducing the number of processes and improving efficiency.

Claims

1. A pressure-controllable bearing pressing device for a fan, comprising a tooling body, characterized in that: A guide post for guiding the stator assembly is provided in the middle of the upper surface of the tooling body. The guide post has a hole in the middle and an elastic positioning post passes through it. A lifting spring is provided between the outer side of the elastic positioning post and the tooling body. An upper bearing positioning seat is provided at the top of the elastic positioning post. An elastic retaining ring positioning groove is provided below the upper bearing positioning seat on the elastic positioning post.

2. The pressure-controllable bearing pressing device for a fan according to claim 1, characterized in that: The upper surface of the tooling body is a tooling operating table. The tooling operating table is provided with a limiting step around its circumference to limit the downward movement of the stator assembly. The height difference between the limiting step and the top surface of the guide column is the height difference after the stator assembly and the upper bearing are assembled.

3. The pressure-controllable bearing pressing device for a fan according to claim 1, characterized in that: The tooling body includes an upper platform and a lower platform. The elastic positioning column has an annular protrusion in the middle. The lifting spring is disposed between the annular protrusion and the lower platform. The annular protrusion and the bottom surface of the upper platform form a lifting limit.

4. The pressure-controllable bearing pressing device for a fan according to claim 3, characterized in that: The lower platform has an opening in the middle, and a cable tray is installed above the opening in the middle of the lower platform. The cable tray has openings corresponding to the elastic positioning posts, and the lower end of the lifting spring abuts against the upper surface of the cable tray.

5. The pressure-controllable bearing pressing device for a fan according to claim 3, characterized in that: The bottom surface of the upper platform is provided with guide grooves corresponding to the annular convex edge of the elastic positioning column.

6. The pressure-controllable bearing pressing device for a fan according to claim 3, characterized in that: A support column is provided between the upper platform and the lower platform. The fixing bolts pass through the lower platform and the support column from bottom to top and are then fixed to the screw holes on the bottom surface of the upper platform.

7. The pressure-controllable bearing pressing device for a fan according to claim 1, characterized in that: A rotor assembly is disposed on the outside of the stator assembly. The rotor assembly includes a rotor shaft passing through the center of the stator assembly. A lower bearing is disposed between the lower end of the rotor shaft and the stator assembly, and an upper bearing is disposed between the upper end of the rotor shaft and the stator assembly. The rotor assembly and the stator assembly are installed in an inverted press-fit configuration with their upper surfaces facing down.

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