An auxiliary mounting bearing structure
By using the positioning plate and extension shaft in the auxiliary installation bearing structure, the problem of rotor misalignment caused by magnetic attraction and self-weight during the assembly process of the internal rotor motor is solved, achieving precise alignment and efficient assembly of the bearing, and improving assembly efficiency and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANCHANG SANRUI INTELLIGENT TECH CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-07
AI Technical Summary
In internal rotor motors, especially in slender wind turbine generators and industrial drive systems, the rotor may shift or tilt during assembly due to magnetic attraction and its own weight, making it difficult to achieve precise bearing alignment and affecting assembly efficiency.
An auxiliary bearing mounting structure is adopted, including a positioning plate and an extension shaft. The radial and axial positioning surfaces cooperate with the rotating shaft to ensure that the center line of the positioning plate coincides with the center line of the rotor mounting. A stable connection is achieved through the threaded connection and insertion area between the extension shaft and the rotating shaft, providing a precise reference plane and convenient operation.
It effectively eliminates radial displacement of the rotor caused by magnetic attraction or its own weight, ensures concentricity of bearing installation, improves assembly efficiency, and enables quick disassembly and high-precision adjustment through the extended shaft structure.
Smart Images
Figure CN224473121U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor assembly technology, and in particular to an auxiliary bearing installation structure. Background Technology
[0002] An internal rotor motor is a type of motor structure in which the rotating parts (rotor) are located inside the motor, while the stationary parts (stator) are located on the outside. To ensure the stability of the motor's operation, this type of motor typically requires two or more bearings for support.
[0003] In internal rotor motors employing a dual-bearing structure, the conventional assembly process is as follows: first, install one bearing; then, install the rotor into the stator cavity; and finally, install the second bearing. However, in specialized applications such as wind turbine generators and industrial drive systems, internal rotor motors often feature a slender structural design, resulting in a significant length-to-diameter ratio. This structural characteristic leads to the following problems during rotor assembly: first, the strong magnetic attraction between the stator and rotor causes rotor misalignment; second, the rotor's own weight also causes the rotor shaft to tilt and deviate from the installation center axis. Under the combined effect of these factors, it is difficult to maintain the rotor in the ideal centered position, making the installation of the second bearing extremely difficult and affecting the motor's assembly efficiency. Utility Model Content
[0004] Based on this, the purpose of this utility model is to provide an auxiliary bearing installation structure, which aims to synchronously align the bearings at both ends of the rotor shaft with high efficiency.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An auxiliary bearing mounting structure is applied in an internal rotor motor. The internal rotor motor includes a stator and a rotor. The stator has a receiving cavity for accommodating the rotor and an opening communicating with the receiving cavity. The rotor has a rotating shaft. The periphery of the opening has at least one radial positioning surface and at least one axial positioning surface. The auxiliary bearing mounting structure includes a positioning disk. The positioning disk is coaxially connected to the rotating shaft. The positioning disk has a positioning contact edge that cooperates with the radial positioning surface and the axial positioning surface. The positioning contact edge cooperates with the radial positioning surface to radially limit the positioning disk until its center line coincides with the mounting center line of the rotor. The positioning contact edge cooperates with the axial positioning surface to restrict the positioning disk from moving axially toward the rotor side. The positioning disk has a through area along the axial direction.
[0006] In addition, the auxiliary bearing mounting structure described above according to this utility model may also have the following additional technical features:
[0007] Furthermore, the end of the rotating shaft is far from the positioning plate, and the auxiliary mounting bearing structure also includes an extension shaft with the same diameter as the rotating shaft. The extension shaft is detachably connected to the rotating shaft and is coaxially arranged. The positioning plate is provided with an insertion area, and the extension shaft is provided with an insertion part that inserts into the insertion area, so that the axis center line of the extension shaft coincides with the axis center line of the rotating shaft.
[0008] Furthermore, the rotating shaft is provided with a coaxially arranged external thread post, the diameter of which is smaller than the diameter of the rotating shaft, and the extension shaft is provided with an internal thread groove that matches the external thread post.
[0009] Furthermore, the periphery of the opening is provided with a stepped groove, and the end face of the positioning disk near the opening is provided with a flange that matches the stepped groove.
[0010] Furthermore, the positioning disk has a hollowed-out center and multiple reinforcing ribs are arranged radially, with the intersection of the multiple reinforcing ribs forming the insertion area.
[0011] Furthermore, the insertion area is an insertion hole, and the end of the extension shaft near the positioning plate is provided with a boss that matches the insertion hole.
[0012] Furthermore, both the insertion hole and the boss are coaxially arranged with the rotating shaft.
[0013] Furthermore, the insertion hole is provided through.
[0014] Furthermore, the auxiliary bearing installation structure also includes a pusher, which movably passes through the through area to push the bearing sleeved on the rotating shaft axially.
[0015] Furthermore, the pusher is provided with push arms spaced apart circumferentially, and a sliding groove matching the reinforcing rib is formed between adjacent push arms. Each push arm is surrounded to form a clamping groove matching the extension shaft and the insertion area. The clamping groove is connected to the sliding groove.
[0016] The beneficial effects of this utility model include at least the following: by tightly fitting the positioning contact edge on the positioning plate with the radial positioning surface at the opening, the radial offset of the rotor caused by magnetic attraction or its own weight is effectively eliminated, ensuring that the center line of the positioning plate and the installation center line of the rotor are precisely coincident; at the same time, the axial positioning surface restricts the axial displacement of the positioning plate, providing a stable reference plane for bearing installation. This dual positioning mechanism controls the concentricity error of the assembly to an extremely low range, solving the technical problem of the difficulty in aligning the bearings at both ends of the slender rotor shaft; through the extension shaft structure and the precise fit between the insertion area and the shaft, the original rotor shaft is extended to the operating side, allowing the operator to make precise adjustments in a more accessible position. Moreover, the extension shaft and the shaft are connected by threads, which not only ensures the rigidity of the connection but also enables quick assembly and disassembly. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the auxiliary bearing mounting structure in one embodiment of the present invention;
[0018] Figure 2 This is a schematic diagram of the structure of the stator opening in one embodiment of the present invention;
[0019] Figure 3 This is a schematic diagram of the positioning disk in one embodiment of the present utility model;
[0020] Figure 4 This is a cross-sectional view of an internal rotor motor using an auxiliary mounting bearing structure in one embodiment of the present invention;
[0021] Figure 5 This is a schematic diagram of the overall structure of the internal rotor motor using the auxiliary mounting bearing structure in one embodiment of the present invention;
[0022] Figure 6 This is a schematic diagram of the structure of the pusher in one embodiment of the present invention;
[0023] Explanation of key component symbols:
[0024] Stator 100, receiving cavity 110, radial positioning surface 121, axial positioning surface 122, rotor 200, rotating shaft 210, external threaded column 211, first bearing 300, positioning plate 400, positioning contact edge 410, through area 420, reinforcing rib 430, insertion hole 440, second bearing 500, extension shaft 600, internal threaded groove 610, boss 620, bearing seat 700, pusher 800, push arm 810, sliding groove 820, clamping groove 830;
[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation
[0026] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.
[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0029] Please refer to Figures 1 to 6 This utility model provides an auxiliary bearing mounting structure for use in an internal rotor motor. The internal rotor motor includes a stator 100 and a rotor 200. The stator 100 has a receiving cavity 110 for accommodating the rotor 200 and an opening communicating with the receiving cavity 110. A first bearing 300 is installed at one end of the receiving cavity 110 opposite to the opening. The rotation center of the rotor 200 is provided with a rotating shaft 210. The left end of the rotating shaft 210 is mounted on the first bearing 300. The periphery of the opening is provided with at least one radial positioning surface 121 and at least one axial positioning surface 122. The auxiliary bearing installation structure includes a positioning disk 400. Specifically, the positioning disk 400 is coaxially connected to the rotating shaft 210. The positioning disk 400 is provided with a positioning contact edge 410 that mates with the radial positioning surface 121 and the axial positioning surface 122. When the corresponding positioning contact edge 410 mates with the radial positioning surface 121, the center line of the positioning disk 400 can be made to coincide with the installation center line of the rotor 200. When the corresponding positioning contact edge 410 mates with the axial positioning surface 122, the positioning disk 400 can be restricted from moving further axially toward the rotor 200. The positioning disk 400 is provided with a through area 420 along the axial direction. When the positioning contact edge 410 on the positioning disk 400 mates with the radial positioning surface 121 and the axial positioning surface 122, the bearing sleeved on the rotating shaft 210 is pushed axially through the through area 420 until the bearing is installed in place.
[0030] In this embodiment, after the left end of the rotating shaft 210 is assembled onto the first bearing 300, the bearing seat 700 is fitted onto the right end of the rotating shaft 210 through the opening. Then, the second bearing 500 is fitted onto the right end of the rotating shaft 210. Next, the positioning plate 400 is coaxially connected to the rotating shaft 210. Then, the positioning contact edge 410 of the positioning plate 400 is fitted together with the radial positioning surface 121 and the axial positioning surface 122. Then, the second bearing 500 fitted onto the rotating shaft 210 is pushed axially so that the second bearing 500 is accurately installed on the bearing seat 700. After that, the positioning plate 400 can be removed.
[0031] In some internal rotor motors, because the shaft 210 has a short axial length, the right end of the shaft 210 is far from the positioning disk 400. In this case, the positioning contact edge 410 of the positioning disk 400 cannot completely fit against the radial positioning surface 121 and the axial positioning surface 122. Therefore, in some optional embodiments, such as... Figure 1 , Figure 4 As shown, the auxiliary bearing mounting structure also includes an extension shaft 600 with the same diameter as the rotating shaft 210. The extension shaft 600 is detachably connected to the rotating shaft 210 and is coaxially arranged with the rotating shaft 210. The positioning disk 400 is provided with an insertion area, and the extension shaft 600 is provided with an insertion part that inserts into the insertion area. Through the cooperation between the insertion part and the insertion area, the positioning disk 400 and the extension shaft 600 are coaxially connected together, thereby making the positioning disk 400 and the rotating shaft 210 coaxially connected together. At this time, the shaft center line of the extension shaft 600 coincides with the shaft center line of the rotating shaft 210. When the positioning contact edge 410 of the positioning disk 400 is in contact with the radial positioning surface 121 and the axial positioning surface 122, the shaft center line of the extension shaft 600 coincides with the mounting center line of the rotor 200.
[0032] In some alternative embodiments, such as Figure 4 As shown, the rotating shaft 210 is provided with a coaxially arranged external thread post 211. The diameter of the external thread post 211 is smaller than the diameter of the rotating shaft 210. The extension shaft 600 is provided with an internal thread groove 610 that matches the external thread post 211. Through the cooperation of the external thread post 211 and the internal thread groove 610, the extension shaft 600 and the rotating shaft 210 are coaxially and stably connected together. After the second bearing 500 is accurately installed on the bearing seat 700, the extension shaft 600 connected to the rotating shaft 210 can be disassembled by screwing on the extension shaft 600.
[0033] In some alternative embodiments, such as Figure 2 As shown, the periphery of the opening is provided with a stepped groove, the inner sidewall of each diameter stepped groove forms a radial positioning surface 121, the inner bottom wall of each diameter stepped groove forms an axial positioning surface 122, and the end face of the positioning disk 400 near the opening is provided with a flange that matches the stepped groove, and the flange forms a positioning contact edge 410.
[0034] In this embodiment, the mating structure between the stepped groove around the opening and the flange of the positioning disk 400 not only further enhances the axial positioning accuracy, but also realizes the "error prevention" function in the assembly process. That is, the flange can be fully embedded in the stepped groove only when it is correctly positioned, thus avoiding assembly deviations caused by operational errors.
[0035] In some alternative embodiments, such as Figure 3 , Figure 5 As shown, the positioning disk 400 has a hollowed-out center and multiple reinforcing ribs 430 are radially arranged on the positioning disk 400. The intersection of the multiple reinforcing ribs 430 forms an insertion area. The positioning disk 400 is connected to the insertion part on the extension shaft 600 through the insertion area, so that the positioning disk 400 and the extension shaft 600 are coaxially connected together, and thus the positioning disk 400 and the rotating shaft 210 are coaxially connected together.
[0036] In some alternative embodiments, such as Figure 3 As shown, the insertion area is an insertion hole 440. The end of the extension shaft 600 near the positioning disk 400 is provided with a boss 620 that matches the insertion hole 440. Through the cooperation between the boss 620 and the insertion hole 440, the positioning disk 400 and the extension shaft 600 are coaxially connected together, thereby making the positioning disk 400 and the rotating shaft 210 coaxially connected together.
[0037] In some alternative embodiments, such as Figure 4 As shown, the insertion hole 440 and the boss 620 are both coaxially arranged with the rotating shaft 210. Through the cooperation of the boss 620 and the insertion hole 440, the positioning plate 400 and the extension shaft 600 are coaxially connected together, thereby making the positioning plate 400 and the rotating shaft 210 coaxially connected together.
[0038] In some alternative embodiments, such as Figure 3 , Figure 4 As shown, the insertion hole 440 is through-hole, which makes it easy to mount the positioning plate 400 onto the extension shaft 600.
[0039] In some alternative embodiments, such as Figure 1 , Figure 4 , Figure 5 As shown, the auxiliary bearing installation structure also includes a pusher 800, which is movably inserted through the through area 420 to push the bearing sleeved on the rotating shaft 210 axially. In this way, when the second bearing 500 is far from the positioning plate 400, it is not necessary to use a long tool to push the second bearing 500.
[0040] In some alternative embodiments, such as Figure 6As shown, the pusher 800 is provided with push arms 810 spaced apart in the circumferential direction. A sliding groove 820 matching the reinforcing rib 430 is formed between adjacent push arms 810. Each push arm 810 surrounds a clamping groove 830 matching the extension shaft 600 and the insertion area. The clamping groove 830 is connected to the sliding groove 820. This allows the pusher 800 to move stably in the axial direction and also makes it easy to remove the pusher 800.
[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0042] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the appended claims.
Claims
1. An auxiliary bearing mounting structure, characterized in that, This invention relates to an internal rotor motor, which includes a stator and a rotor. The stator has a receiving cavity for accommodating the rotor and an opening communicating with the receiving cavity. The rotor has a rotating shaft. The periphery of the opening has at least one radial positioning surface and at least one axial positioning surface. The auxiliary mounting bearing structure includes a positioning disk, which is coaxially connected to the rotating shaft. The positioning disk has a positioning contact edge that mates with the radial and axial positioning surfaces. The positioning contact edge mates with the radial positioning surface to radially limit the positioning disk until its centerline coincides with the mounting centerline of the rotor. The positioning contact edge mates with the axial positioning surface to restrict the positioning disk from moving axially toward the rotor. The positioning disk has a through area along its axial direction.
2. The auxiliary bearing mounting structure according to claim 1, characterized in that, The end of the rotating shaft is away from the positioning plate. The auxiliary mounting bearing structure also includes an extension shaft with the same diameter as the rotating shaft. The extension shaft is detachably connected to the rotating shaft and is coaxially arranged. The positioning plate is provided with an insertion area, and the extension shaft is provided with an insertion part that inserts into the insertion area, so that the center line of the extension shaft coincides with the center line of the rotating shaft.
3. The auxiliary bearing installation structure according to claim 2, characterized in that, The rotating shaft is provided with an external threaded post coaxially arranged, the diameter of the external threaded post being smaller than the diameter of the rotating shaft, and the extension shaft is provided with an internal threaded groove that matches the external threaded post.
4. The auxiliary bearing mounting structure according to claim 1, characterized in that, The periphery of the opening is provided with a stepped groove, and the end face of the positioning disk near the opening is provided with a flange that matches the stepped groove.
5. The auxiliary bearing mounting structure according to claim 2, characterized in that, The positioning disk has a hollowed-out center and multiple reinforcing ribs arranged radially. The intersection of the multiple reinforcing ribs forms the insertion area.
6. The auxiliary bearing mounting structure according to claim 5, characterized in that, The insertion area is a insertion hole, and the end of the extension shaft near the positioning plate is provided with a boss that matches the insertion hole.
7. The auxiliary bearing mounting structure according to claim 6, characterized in that, Both the insertion hole and the boss are coaxially arranged with the rotating shaft.
8. The auxiliary bearing mounting structure according to claim 6, characterized in that, The insertion hole is provided throughout.
9. The auxiliary bearing mounting structure according to any one of claims 5 to 8, characterized in that, The auxiliary bearing installation structure also includes a pusher, which movably passes through the through area to push the bearing sleeved on the rotating shaft axially.
10. The auxiliary bearing mounting structure according to claim 9, characterized in that, The pusher is provided with push arms spaced apart circumferentially, and a sliding groove matching the reinforcing rib is formed between adjacent push arms. Each push arm is surrounded to form a clamping groove matching the extension shaft and the insertion area. The clamping groove is connected to the sliding groove.