Shaft bearing protection structure for motor and motor
By using a combination of a spacer and annular washer at the motor shaft bearing, the problem of motor protection in humid environments is solved, achieving simplified design and efficient waterproofing, thus improving the reliability and service life of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU LEILI MOTOR
- Filing Date
- 2025-09-12
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional motor shaft bearings are prone to rust in high temperature and high humidity environments. Existing protective structures are complex and costly, and cannot effectively protect against humid conditions.
The structure combines a partition body and an annular washer to form two barriers, preventing moisture and dust from entering the bearing. Water droplets are discharged through the centrifugal force of the annular washer, simplifying the structural design.
It effectively prevents bearings from rusting, improves the reliability and lifespan of motors in humid environments, and reduces production costs and weight.
Smart Images
Figure CN224596271U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a shaft bearing protection structure and motor suitable for use in motors. Background Technology
[0002] Traditional micro motors mostly use oil-impregnated bearing structures, with the bearing end face exposed outside the motor and in direct contact with the outside environment. When the motor runs under harsh conditions such as high temperature and high humidity for a long time, moisture can easily accumulate, flow along the shaft to the bearing, and even penetrate into the motor. Dust can also easily accumulate on the bearing end face, which will cause the bearing to rust over time, resulting in bearing jamming and failure, seriously affecting the normal operation of the motor and its service life.
[0003] Based on the above problems, existing technology uses washers installed on the shaft to prevent moisture from flowing directly to the bearing. Simultaneously, the centrifugal force generated by the motor's rotation can throw the water droplets accumulated on the washer's end face outwards. However, this solution still has drawbacks. If the washer is installed inside the housing, the thrown-out water droplets will instead accumulate inside the housing and cannot be discharged. In this case, the washer only serves a dustproof function, and obviously, a motor using this design cannot be used in humid conditions.
[0004] Based on the above, CN118842226A discloses a waterproof protection structure for motor shaft bearings. This structure, through a multi-layered protection structure of a sealing ring, a sealing cover, and a waterproof cover, significantly improves the waterproof performance of the motor shaft bearings. While this meets the waterproofing requirements, the overall waterproof structure is complex. This complexity increases production and assembly costs, and also adds to the overall weight of the motor. For scenarios requiring lightweight and low-cost motors, the solution disclosed in the above-mentioned technology is not applicable.
[0005] Based on the above, from the perspective of balancing structural simplification and waterproof performance, the protective structure of the motor shaft bearing needs further optimization. Utility Model Content
[0006] The primary objective of this invention is to provide a protective structure for the shaft bearing of an electric motor, thereby addressing the technical challenge of balancing structural simplification with waterproofing performance.
[0007] The second objective of this invention is to provide a motor that solves the technical problem of balancing structural simplification and waterproof performance.
[0008] The protective structure for the shaft bearing of this utility model is implemented as follows: A protective structure for a motor shaft bearing, comprising at least: Motor housing, which includes a housing body, a bearing chamber provided in the housing body for installing a bearing, and a boss integrally formed on the housing body and extending towards the outside of the motor; a through hole coaxial with the bearing chamber and adapted for a rotating shaft to pass through is preset in the boss; The first protective member, which includes an annular partition body provided on the inner wall of the through hole; an inner hole adapted for the rotating shaft to pass through is preset in the partition body; the inner diameter of the inner hole is larger than the outer diameter of the rotating shaft; The second protective member, which includes an annular washer fixedly sleeved on the rotating shaft and located on the side of the partition body facing away from the bearing chamber; the outer diameter of the annular washer is smaller than the inner diameter of the through hole, and the outer diameter of the annular washer is larger than the inner diameter of the inner hole.
[0009] In an optional implementation case of the present utility model, there is an axial gap between the annular washer and the partition body; and There is an axial gap between the partition body and the bearing chamber.
[0010] In an optional implementation case of the present utility model, the axial distance between the end of the through hole far from the bearing chamber and the end of the partition body facing away from the bearing chamber is h2, and the axial gap between the annular washer and the partition body is h1; then 1mm ≤ h1 < h2.
[0011] In an optional implementation case of the present utility model, the annular washer is in interference fit with the rotating shaft.
[0012] In an optional implementation case of the present utility model, the annular washer is made of plastic material; and The rotating shaft is made of metal material.
[0013] In an optional implementation case of the present utility model, a limiting structure with concave-convex fit is provided between the annular washer and the rotating shaft.
[0014] In an optional implementation case of the present utility model, the through hole at least includes a flared hole extending to the port of the through hole far from the bearing chamber; The inner diameter of the flared hole gradually increases from the inner side to the outer side of the motor.
[0015] In an optional implementation case of the present utility model, if the inner diameter of the inner hole is D2 and the outer diameter of the annular washer is D1, then D1 ≥ D2.
[0016] In an optional implementation case of the present utility model, the partition body is integrally formed on the inner wall of the through hole; or The partition body is assembled and fixed on the inner wall of the through hole.
[0017] The motor of the present utility model is realized as follows: An electric motor includes: the shaft bearing protection structure suitable for the electric motor and the electric motor.
[0018] By adopting the above technical solution, this utility model has the following beneficial effects: The utility model is applicable to the shaft bearing protection structure of an electric motor and the motor. In this embodiment, the combination of the partition body and the annular washer forms two barriers against impurities and moisture, which can effectively prevent dust, foreign objects and moisture from flowing to the bearing of the shaft, thereby achieving the protection effect of the bearing. Attached Figure Description
[0019] Figure 1 This is a cross-sectional view of the motor of this utility model; Figure 2 yes Figure 1 Enlarged view of part A; Figure 3 This is a schematic diagram of the internal structure of the boss of the motor of this utility model; Figure 4 This is a schematic diagram showing the dimensions of the first protective component, the second protective component, and the rotating shaft of the motor corresponding to Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the through hole structure of the boss of the motor of this utility model; Figure 6 This is a schematic diagram showing the dimensions of the first protective component, the second protective component, and the rotating shaft of the motor corresponding to Embodiment 2 of this utility model.
[0020] In the diagram: 1. Shell body, 11. Bearing chamber, 2. Boss, 21. Cylindrical hole, 22. Horn hole, 3. Partition, 4. Annular washer, 5. Annular partition, 6. Shaft, 7. Bearing. Detailed Implementation
[0021] To make the contents 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.
[0022] Example 1: Please see Figures 1 to 5 As shown, this embodiment provides a shaft bearing protection structure suitable for motors, which includes at least: a motor housing, a first protective component, and a second protective component for use.
[0023] Specifically, firstly, the motor housing includes a housing body 1, a bearing chamber 11 disposed in the housing body 1 for mounting the bearing 7, and a boss 2 integrally formed on the housing body 1 and extending toward the outside of the motor; the boss 2 has a through hole pre-set in it, which is coaxial with the bearing chamber 11 and suitable for the shaft 6 to pass through.
[0024] Secondly, the first protective member includes an annular partition body 3 provided on the inner wall of the through hole; a through hole adapted for the rotation shaft 6 to pass through is preset in the partition body 3; the inner diameter of the through hole is larger than the outer diameter of the rotation shaft 6. The partition body 3 is integrally formed on the inner wall of the through hole; or the partition body 3 is assembled and fixed on the inner wall of the through hole. It should be noted here that since the installation position of the motor with the rotation shaft bearing protection structure for the motor of this embodiment may be located in the refrigerator freezer compartment, in order to ensure that the motor can still operate normally under frost conditions, a certain safety gap needs to be reserved between the inner diameter of the through hole of the partition body 3 and the outer wall surface of the rotation shaft 6 to prevent the partition body 3 and the rotation shaft 6 from frosting and freezing in extreme cases, affecting the normal operation of the motor.
[0025] Furthermore, the second protective member includes an annular washer 4 fixedly sleeved on the rotation shaft 6 and located on the side of the partition body 3 facing away from the bearing chamber 11; the outer diameter of the annular washer 4 is smaller than the inner diameter of the through hole, and the outer diameter of the annular washer 4 is larger than the inner diameter of the through hole. In this structure, it can be understood that an S-shaped path is formed between the inner wall of the through hole, the outer wall of the annular washer 4, the hole wall of the through hole, and the circumferential gap between the partition body 3 and the annular washer 4 to form a blocking effect on impurities and water vapor. In this regard, in detail with reference to the accompanying drawings, let the inner diameter of the through hole be D2, the outer diameter of the annular washer 4 be D1, and the outer diameter of the rotation shaft 6 be d1, then D2 > d1, D1 ≥ D2.
[0026] Based on the above structure, it should be noted that there is an axial gap between the annular washer 4 and the partition body 3; and there is an axial gap between the partition body 3 and the bearing chamber 11. In this regard, in detail with reference to the accompanying drawings, the axial distance between the end of the through hole away from the bearing chamber 11 and the end of the partition body 3 facing away from the bearing chamber 11 is h2, and the axial gap between the annular washer 4 and the partition body 3 is h1; then 1mm ≤ h1 < h2.
[0027] It should be noted that regarding the fitting method of the annular washer 4 and the rotation shaft 6, in the first optional implementation case, the annular washer 4 is in interference fit with the rotation shaft 6. In this regard, optionally, the annular washer 4 is made of plastic material; and the rotation shaft 6 is made of metal material. In the second optional implementation case, a limiting structure with concave-convex fit is provided between the annular washer 4 and the rotation shaft 6. In this regard, micro-protrusions can be designed on the inner wall of the annular washer 4 fitting the rotation shaft 6, and micro-indentations adapted to the micro-protrusions can be designed on the outer wall of the rotation shaft 6. In this way, the stability and reliability of the axial position in the fitting state of the annular washer 4 and the rotation shaft 6 can be further improved through the concave-convex fit method. In this embodiment, through the fixed fit of the annular washer 4 and the rotation shaft 6, while the annular washer 4 rotates with the rotation shaft 6, an axial position change of the annular washer 4 relative to the rotation shaft 6 occurs on the wall surface.
[0028] Furthermore, it should be noted that, in one specific optional implementation, the through hole in this embodiment includes at least a flared hole 22 extending to the port of the through hole away from the bearing chamber 11; the inner diameter of the flared hole 22 gradually increases in size from the inner side of the motor to the outer side. This can be achieved by setting the entire through hole as a flared structure, or by having the through hole include a cylindrical hole 21 and a flared hole 22, with the cylindrical hole 21 located between the flared hole 22 and the bearing chamber 11. In this embodiment, exemplified by the use of a cylindrical hole 21 and a flared hole 22, the partition 3 can be designed within the cylindrical hole 21 or at the junction of the cylindrical hole 21 and the flared hole 22, while the annular washer 4 is located within the flared hole 22, with the outer diameter D1 of the annular washer 4 being smaller than the inner diameter of the flared hole 22.
[0029] In summary, for the motor shaft bearing protection structure of this embodiment, during the assembly of the shaft 6, the shaft 6 extends outward through the mounting hole of the bearing 7 in the bearing chamber 11 and the through hole of the boss 2 in the housing body 1. After the motor is fully assembled, the annular washer 4 is fitted onto the shaft 6 from the part of the shaft 6 extending outside the housing body 1, and then pushed into the flared hole 22 corresponding to the through hole along the circumference of the shaft 6. This completes the assembly and fitting between the shaft 6, the motor housing, and the annular washer 4. The structure is simple and easy to process and assemble. This embodiment, through the cooperation of the partition 3 and the annular washer 4, forms two barriers against impurities and moisture, effectively preventing dust, foreign matter, and water droplets from flowing towards the bearing 7 of the shaft 6, thereby providing protection for the bearing 7.
[0030] Example 2: Please refer to Figure 6. Based on the shaft bearing protection structure and motor applicable to motors in Embodiment 1, the shaft bearing protection structure and motor applicable to motors provided in this embodiment also include a third protective component, which includes an annular partition 5 fixedly sleeved on the shaft 6 and located on the side of the annular washer 4 facing away from the partition body 3; the outer diameter of the annular partition 5 is smaller than the inner diameter of the through hole, and the outer diameter of the annular partition 5 is larger than the outer diameter of the annular washer 4.
[0031] The fit between the annular spacer 5 and the rotating shaft 6 in this embodiment is similar to that of the annular washer 4. Essentially, the annular spacer 5 in this embodiment functions the same as the annular washer 4. The reason for adding the annular spacer 5 in this embodiment, based on Embodiment 1, is that the through hole includes at least one section of a flared hole 22. The inner diameter of the flared hole 22 gradually increases from the inner side of the motor towards the outer side. Considering the inner diameter of the flared hole 22, by setting an annular washer 4 and an annular spacer 5 with different outer diameters, an adaptive clearance fit can be formed with the inner diameter of the flared hole 22. This reduces the probability of impurities and moisture from the outside of the motor housing passing through the gap formed by the annular washer 4 and the annular spacer on the inner wall of the flared hole 22. This not only meets the usage requirements of the flared hole 22 but also further improves the waterproofing effect.
[0032] Example 3: Please see Figures 1 to 6 As shown, based on the shaft bearing protection structure and motor applicable to motors in Embodiment 1 or Embodiment 2, this embodiment provides a motor, including: the shaft bearing protection structure and motor applicable to motors in Embodiment 1 or Embodiment 2.
[0033] For the motor in this embodiment, it should be noted that it is particularly suitable for use in a horizontal position along the axis of the rotating shaft 6, that is, water vapor and impurities need to enter the through hole of the housing body 1 in the left and right direction. The cooperation of the first protective member and the second protective member forms a stop for water vapor and impurities, thereby achieving the protection of the bearing 7 of the rotating shaft 6. Specifically, when the motor is installed in a humid environment and is stationary, the water droplets condensed on the shaft 6 will not leak to the bearing 7 side of the motor due to the obstruction of the annular washer 4. When the motor is running, the annular washer 4 installed on the shaft 6 rotates coaxially with the shaft 6, generating a large centrifugal force on the axial end face of the annular washer 4, preventing water vapor from adhering and condensing on the annular washer 4. At the same time, the water droplets are thrown onto the inner wall of the through hole of the boss 2. Since the through hole has a flared hole 22 and the annular washer 4 is set in the flared hole 22, the water droplets cannot condense on the inner wall of the through hole. The water droplets will flow along the inclined surface of the flared hole to the outside of the motor housing and thus be discharged from the motor housing, greatly enhancing the environmental adaptability of the motor and effectively improving the service life of the motor.
[0034] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
[0035] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0038] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0039] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
Claims
1. A protective structure for the shaft bearing of an electric motor, characterized in that, At least including: The motor housing includes a housing body, a bearing chamber disposed in the housing body for mounting a bearing, and a boss integrally formed on the housing body and extending toward the outside of the motor; the boss has a through hole pre-set in it, which is coaxial with the bearing chamber and suitable for the shaft to pass through. The first protective component includes an annular partition body disposed on the inner wall of the through hole; the partition body has a pre-set inner hole suitable for the shaft to pass through; the inner diameter of the inner hole is larger than the outer diameter of the shaft. The second protective component includes an annular washer fixedly sleeved on the rotating shaft and located on the side of the partition body facing away from the bearing chamber; the outer diameter of the annular washer is smaller than the inner diameter of the through hole, and the outer diameter of the annular washer is larger than the inner diameter of the inner hole.
2. The shaft bearing protection structure for electric motors according to claim 1, characterized in that, An axial gap exists between the annular washer and the partition body; and There is an axial gap between the partition and the bearing chamber.
3. The shaft bearing protection structure for motors according to claim 2, characterized in that, The axial distance between the end of the through hole away from the bearing chamber and the end of the partition body facing away from the bearing chamber is h2, and the axial clearance between the annular washer and the partition body is h1; then 1mm≤h1 <h2。 4. The shaft bearing protection structure for electric motors according to claim 1, characterized in that, The annular washer is interference-fitted with the rotating shaft.
5. The shaft bearing protection structure for motors according to claim 4, characterized in that, The annular washer is made of plastic; and The shaft is made of metal.
6. The shaft bearing protection structure for electric motors according to claim 1 or 4, characterized in that, The annular washer and the rotating shaft are provided with a limiting structure that fits in a concave-convex manner.
7. The shaft bearing protection structure for electric motors according to any one of claims 1 to 4, characterized in that, The through hole includes at least one flared section extending to a port of the through hole away from the bearing chamber; The inner diameter of the horn hole gradually increases from the inside of the motor towards the outside.
8. The shaft bearing protection structure for electric motors according to any one of claims 1 to 4, characterized in that, Let the inner diameter of the inner hole be D2 and the outer diameter of the annular washer be D1, then D1≥D2.
9. The shaft bearing protection structure for electric motors according to any one of claims 1 to 4, characterized in that, The partition is integrally formed on the inner wall of the through hole; or The partition body is assembled and fixed on the inner wall of the through hole.
10. An electric motor, characterized in that, include: The shaft bearing protection structure for electric motors as described in any one of claims 1 to 9.