Micro-motion prevention bearing assembly, motor and ducted fan machine

Abstract

The application relates to the technical field of bearings, in particular to a micro-motion-preventing bearing assembly, a motor and a ducted air blower. The bearing of the micro-motion-preventing bearing assembly comprises a bearing outer ring, a bearing inner ring and balls, the balls are rolling arranged in a raceway between the bearing outer ring and the bearing inner ring; an end cover is detachably connected to one end of the bearing in the axial direction, a buffer gasket is located between the end cover and the balls, and the buffer gasket is slidingly arranged between the bearing outer ring and the bearing inner ring; an elastic piece is connected to the end cover and the buffer gasket at two ends respectively, and an elastic restoring force generated by the elastic piece makes the buffer gasket press against the balls. The structure can effectively constrain the free movement of the balls by applying a preloaded compression force to the balls, can effectively prevent micro-motion abrasion caused by repeated vibration when the bearing or a product to which the bearing is applied is in a transportation state, can prolong the service life of the bearing, and can reduce noise.

Description

Technical Field

[0001] This application relates to the field of bearing technology, and in particular to an anti-fretting bearing assembly, a motor, and a duct air conditioner. Background Technology

[0002] Ductless air conditioners are a type of air conditioner, in which the fan is driven by a motor. Among related technical issues, bearing noise is a prominent problem in after-sales complaints about ductless air conditioners. Upon review, it was found that this was caused by fretting wear of the motor bearings within the ductless air conditioner.

[0003] Fretting wear in bearings is caused by extremely small relative displacements of the contact surfaces within the bearing due to external vibrations. This leads to frictional wear on the contact surfaces and increased noise. Specifically, in the case of a fully packaged duct air conditioner, since the fan blades of the motor are not damped and fixed, and the motor has a dual-output shaft structure, fan blade vibration during long-distance transportation causes fretting wear in the bearings within the motor. On the other hand, even when the bearing exists independently, a certain clearance is required between the rollers and raceways. When the bearing is subjected to impact or vibration, the rollers will send fretting movements within the raceways, resulting in the accumulation of fretting wear on the contact surfaces within the raceways, which also generates noise. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides an anti-fretting bearing assembly, a motor, and a duct air conditioner.

[0005] According to a first aspect of this application, embodiments of this application provide an anti-fretting bearing assembly, comprising:

[0006] A bearing, comprising an outer ring, an inner ring, and balls, wherein the balls are rotatably disposed in a raceway between the outer ring and the inner ring;

[0007] An end cap, detachably connected to one end of the bearing axially.

[0008] A buffer pad is located between the end cap and the ball, and the buffer pad is slidably disposed between the outer ring and the inner ring of the bearing;

[0009] An elastic element has its two ends connected to the end cap and the buffer pad, respectively. The elastic restoring force generated by the elastic element causes the buffer pad to press against the ball.

[0010] Furthermore, the buffer pad has a circular ring structure.

[0011] Furthermore, the end cap is detachably connected to the outer ring of the bearing, the end cap covers the end face of the inner ring of the bearing, and a movable gap is formed between the inner ring of the bearing and the end cap.

[0012] Furthermore, the outer edge of the buffer pad is in movable fit with the inner wall of the outer ring of the bearing, and the inner edge of the buffer pad is in clearance fit with the outer edge of the inner ring of the bearing.

[0013] Furthermore, the outer edge of the buffer pad is embedded with a plurality of rollers, which roll in contact with the inner wall of the outer ring of the bearing.

[0014] Furthermore, the end cap is an electromagnetic generator, and the buffer pad is made of a magnetically conductive material. When the electromagnetic generator is energized, the magnetic attraction force generated by the electromagnetic generator drives the buffer pad to overcome the elastic restoring force of the elastic element and move away from the ball.

[0015] Furthermore, the elastic element has multiple components evenly distributed in the circumferential direction.

[0016] Furthermore, the anti-fretting bearing assembly also includes a dust cover, and the dust cover and the end cap are respectively connected to both ends of the bearing axially.

[0017] According to a second aspect of this application, an embodiment of this application provides an electric motor, which includes the anti-fretting bearing assembly provided in the first aspect of this application, wherein the inner ring of the bearing is sleeved and fixed on the motor shaft of the electric motor.

[0018] According to a third aspect of this application, an embodiment of this application provides a duct air conditioner that includes the motor provided in the second aspect of this application.

[0019] In the anti-fretting bearing assembly provided in this application, when the bearing is in a non-operating state (e.g., during equipment shutdown or transportation), the elastic restoring force generated by the elastic element pushes the buffer pad axially against the balls, causing the balls to be biased towards one side of the raceway, forming stable contact with the inner and outer rings of the bearing. In this state, the balls are compressed, significantly increasing the static friction between the balls and the raceway. This effectively limits the slight relative displacement between the balls and the raceway caused by vibration, thereby preventing fretting wear. This structure, by applying a preload clamping force to the balls, effectively constrains their free movement. It can effectively prevent fretting wear caused by repeated vibration when the bearing or the product in which it is applied is in a transportation state, thus improving bearing life and reducing noise. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0021] Figure 1An exploded view of the anti-fretting bearing assembly provided in an embodiment of this application is shown schematically.

[0022] Figure 2 A top view of the anti-fretting bearing assembly provided in an embodiment of this application is schematically shown;

[0023] Figure 3 A partial cross-sectional view of the anti-fretting bearing assembly provided in the embodiments of this application is schematically given, and the cross-sectional area and direction are as follows: Figure 2 As shown in AA;

[0024] Figure 4 for Figure 3 A magnified view of part B in the middle section.

[0025] In the picture:

[0026] 100. Bearing inner ring;

[0027] 110. First groove;

[0028] 200. Bearing outer ring;

[0029] 210. Second groove;

[0030] 300, ball bearing;

[0031] 400. End cap;

[0032] 500. Buffer pads;

[0033] 510. Roller;

[0034] 600. Elastic components;

[0035] 700, raceway;

[0036] 800. Dust cover. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0038] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a system, product or device that includes a series of units is not necessarily limited to those units that are explicitly listed, but may include units that are not explicitly listed or that are inherent to such products or devices.

[0039] In this application, the terms "upper," "lower," "inner," "middle," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0040] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0041] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0043] This application provides an anti-fretting bearing assembly, which is suitable for devices such as motors and fans that require long-distance transportation or are susceptible to external vibration. It is especially suitable for motors of duct machines with a dual-output shaft structure, and can effectively prevent bearing wear caused by fretting when the bearing is not in operation.

[0044] like Figure 1-4As shown, the main structure of this anti-fretting bearing assembly includes a bearing, an end cap 400, a buffer gasket 500, and an elastic element 600. The bearing includes an outer ring 200, an inner ring 100, and balls 300. The balls 300 are rotatably disposed in a raceway 700 between the outer ring 200 and the inner ring 100. Specifically, a first groove 110 is provided around the outer side of the inner ring 100, and a second groove 210 is provided around the inner side of the outer ring 200. The first groove 110 and the second groove... 210 is used to define the raceway 700 where the roller 510 is located; the end cap 400 is detachably connected to one end of the bearing in the axial direction; the buffer pad 500 is located between the end cap 400 and the ball 300, and the buffer pad 500 is slidably disposed between the outer ring 200 and the inner ring 100 of the bearing; the two ends of the elastic member 600 are respectively connected to the end cap 400 and the buffer pad 500, and the elastic restoring force generated by the elastic member 600 causes the buffer pad 500 to press against the ball 300.

[0045] In the above embodiment, the end cap 400 is a detachable structure, installed at one axial end of the bearing, and can be engaged with the bearing by screwing, snap-fitting, or plugging. This allows the component to be temporarily assembled during transportation or installation and easily removed before the equipment is put into operation. The buffer pad 500 is located between the end cap 400 and the ball 300, and is disposed between the outer ring 200 and the inner ring of the bearing, and can slide in the axial direction. The two ends of the elastic member 600 are respectively connected to the end cap 400 and the buffer pad 500, and can apply a continuous axial thrust to the buffer pad 500 in the installed state.

[0046] When the anti-fretting bearing assembly is not in operation, such as during shutdown or transportation, by connecting the end cover 400 to one end of the bearing, one end of the elastic element 600 abuts against the end cover 400, and the other end pushes the buffer pad 500 along the bearing axis towards the ball 300 between the bearing outer ring 200 and the bearing inner ring 100, and pushes the ball 300 to one side of the axial direction, so that the ball 300 is squeezed between the buffer pad 500, the bearing inner ring 100 and the bearing outer ring 200, increasing the force on the ball 300 with the bearing inner ring 100 and the outer ring, and improving the static friction of the contact surface, so that when the bearing is subjected to vibration or disturbance, the ball 300 will not move relative to the adjacent structure, thereby reducing the fretting wear of the ball 300.

[0047] Before the equipment is put into operation, the end cap 400 can be removed, and the buffer pad 500 and elastic element 600 can also be removed together, restoring the bearing to normal operating condition without affecting its rolling accuracy and power transmission performance. This solution has a simple structure, low implementation cost, and strong adaptability, and is suitable for various standard bearing structures, demonstrating good practical value and promising prospects for promotion.

[0048] In some embodiments, the buffer pad 500 is an annular structure, which is disposed in the space between the outer ring 200 and the inner ring 100 of the bearing and can slide along the axial direction of the bearing.

[0049] The annular buffer pad 500 effectively covers all the balls 300 between the outer ring 200 and the inner ring 100 of the bearing, improving the uniformity of force distribution. Furthermore, its shape facilitates machining and assembly, and it offers strong adaptability. Under the action of the elastic element 600, the annular buffer pad 500 can be pushed axially towards the balls 300, causing multiple balls 300 to be simultaneously stressed. This achieves an overall pre-tightening effect on the balls 300, further enhancing the static friction between the balls 300 and the raceway 700, effectively suppressing fretting and reducing the risk of wear.

[0050] In some embodiments, the end cap 400 is detachably connected to the outer ring 200 of the bearing, covering the end face of the inner ring 100 of the bearing, and a movable gap is formed between the inner ring 100 and the end cap 400. This arrangement ensures that, in the installed state, the orthogonal projection of the end cap 400 perpendicular to the bearing axial direction completely covers the space between the outer ring 200 and the inner ring 100 of the bearing, effectively sealing the opening on one side of the bearing. This prevents dust, particles, or other impurities from entering the bearing, extending its service life. Furthermore, the movable gap between the inner ring 100 and the end cap 400 effectively prevents direct contact between them, ensuring that when the inner ring 100 rotates during bearing operation, it does not interfere with the end cap 400, preventing unnecessary mechanical friction or structural wear. This structural design ensures sealing protection while helping to prevent noise, heat accumulation, and failure risks caused by interference.

[0051] In some embodiments, the outer edge of the buffer pad 500 is in movable engagement with the inner wall of the bearing outer ring 200, and the inner edge of the buffer pad 500 is in clearance engagement with the outer edge of the bearing inner ring 100.

[0052] This structural design ensures that the buffer pad 500 is radially limited by the bearing outer ring 200, thus maintaining a stable position during axial sliding and preventing abnormalities such as misalignment or jamming that could affect performance. On the other hand, a clearance fit is provided between the inner edge of the buffer pad 500 and the outer edge of the bearing inner ring 100 to prevent frictional interference between the buffer pad 500 and the bearing inner ring 100 during motor operation.

[0053] Since the inner ring 100 of the bearing is usually used to achieve a fixed connection with the motor shaft and rotate synchronously with the motor shaft, it is necessary to ensure that the buffer shim 500 is relatively stationary in the bearing structure or only moves axially, and does not come into contact with the high-speed rotating inner ring 100 of the bearing. This effectively prevents additional noise, heat and wear caused by friction, and improves the overall reliability and service life of the anti-fretting bearing assembly.

[0054] In some embodiments, the outer edge of the buffer pad 500 is provided with a plurality of rollers 510, which roll in contact with the inner wall of the bearing outer ring 200.

[0055] By embedding rollers 510 on the outer edge of the buffer pad 500, the frictional resistance of the buffer pad 500 during axial sliding can be significantly reduced, allowing it to move more smoothly along the bearing axial direction under the drive of the elastic element 600, thereby improving response speed and motion accuracy. The introduction of rollers 510 can effectively alleviate problems such as wear and heat generation caused by friction in traditional sliding fits. Since the rollers 510 and the inner wall of the bearing outer ring 200 are in rolling contact, the fit accuracy is higher and the movement is smoother, which can further enhance the limiting effect of the buffer pad 500, ensuring that it moves only in the axial direction without wobbling or deviation, thereby ensuring that the preload applied by the elastic element 600 is accurately transmitted to the ball 300, achieving the technical objective of suppressing fretting wear.

[0056] In some embodiments, the end cap 400 is an electromagnetic generator, and the buffer pad 500 is made of a magnetically conductive material. When the electromagnetic generator is energized, the magnetic attraction force generated by the electromagnetic generator drives the buffer pad 500 to overcome the elastic restoring force of the elastic element 600 and move away from the ball 300. In this embodiment, the specific implementation of the end cap 400 as an electromagnetic generator is not specifically limited. For example, the electromagnetic generator may specifically include an electromagnetic coil, a magnetic core, and a magnetically conductive outer shell. The electromagnetic coil is wound around the outside of the magnetic core, which is arranged along the axial direction of the bearing and located outside the buffer pad 500. The magnetically conductive outer shell covers the electromagnetic coil to form a closed magnetic circuit, thereby increasing the magnetic flux density and enhancing the magnetic field concentration. The buffer pad 500 is made of a magnetically conductive material, preferably a soft magnetic alloy, silicon steel sheet, iron powder core, or other materials with low coercivity and high permeability to ensure good magnetic response performance under the action of an electromagnetic field.

[0057] When the bearing is stationary (e.g., during shutdown or transportation), and the electromagnetic generator is de-energized, the electromagnetic generator does not generate magnetic attraction, and the elastic member 600 is in a naturally extended state, with one end fixedly connected to the end cap 400 and the other end pressing against the rear side of the buffer pad 500. The axial thrust generated by the elastic element 600 drives the buffer pad 500 to move toward the ball 300, and the inner side of the buffer pad 500 presses against the outer surface of the ball 300, thereby pressing the ball 300 against the raceway 700 between the outer ring 200 and the inner ring 100 of the bearing. Because the buffer pad 500 applies a continuous clamping force to the ball 300, the ball 300 is "locked" on one side in the raceway 700, preventing it from rolling freely in the raceway 700. Even if the bearing is subjected to external transportation vibration, impact or frequent shaking, the ball 300 will not move slightly, thereby effectively preventing local relative slippage between the ball 300 and the raceway 700, avoiding fretting wear on the surface of the raceway 700 and the subsequent noise and life reduction problems.

[0058] When the bearing needs to return to normal operation, the electromagnetic generator is energized, generating a magnetic field. This magnetic field attracts the buffer pad 500, made of magnetically conductive material, towards the end cap 400, thereby overcoming the restoring force generated by the elastic element 600 and moving the buffer pad 500 away from the surface of the ball 300. At this time, the ball 300 is released from the compressed state and can roll freely in the raceway 700, thus restoring the bearing to its normal operating state.

[0059] In this structure, the position of the buffer pad 500 can be adjusted by power control, thereby indirectly switching the "locked" or "unlocked" state of the ball 300. Users or control systems can switch the bearing's working state simply by controlling the power on or off, avoiding the inconvenience of disassembling the end cover 400 for transportation protection, effectively improving the automation level and ease of use of the structure.

[0060] In some embodiments, multiple elastic elements 600 are evenly distributed circumferentially, preferably three or more, such as the eight elastic elements 600 shown in the accompanying drawings. These multiple elastic elements 600 are respectively disposed between the end cap 400 and the buffer pad 500, arranged in a ring around the central axis of the bearing, with approximately the same spacing between them, to provide uniform support and stable pushing for the buffer pad 500. This structure ensures a more balanced force distribution on the buffer pad 500 when subjected to the action of the various elastic elements 600, facilitating smooth movement of the buffer pad 500 along the bearing axial direction and preventing offset, tilting, or jamming. Simultaneously, multi-point elastic support effectively improves the uniformity of the axial clamping force distribution of the buffer pad 500 on the ball 300, thereby ensuring consistent locking effect of each ball 300 in the axial direction and enhancing the reliability of fretting suppression. The elastic elements 600 can be compression springs, wave springs, elastic washers, or other structures that can provide elastic restoring force in the axial direction.

[0061] In some embodiments, the anti-fretting bearing assembly further includes a dust cover 800, which and the end cap 400 are respectively connected to the two ends of the bearing in the axial direction.

[0062] The dust cover 800 and the end cover 400 are respectively connected to both ends of the bearing axially. The dust cover 800 is located at the end of the bearing furthest from the end cover 400, and is used to close the end opening to prevent dust, impurities, moisture and other foreign objects from entering the bearing, and to prevent impurities from adhering to the surfaces of the balls 300 and raceways 700, thus affecting the normal operation of the bearing or causing wear. The dust cover 800 can be a metal cover plate, a plastic cover plate or a rubber sealing structure. The dust cover 800 may have a through hole or shaft hole in the middle to allow rotating components such as motor shafts to pass through, and preferably a sealing ring or lip seal is provided between the shaft hole and the shaft to further improve the dustproof and oilproof effect.

[0063] By setting end caps 400 and dust covers 800 at both ends of the bearing, on the one hand, the end caps 400, together with buffer pads 500 and elastic elements 600, can axially limit the balls 300 and prevent fretting wear; on the other hand, the end caps 400 and dust covers 800 can jointly form a sealed protection for the bearing, preventing particles from the external environment from entering the bearing.

[0064] In some embodiments, the bearing may also be equipped with other auxiliary structures as needed. Preferably, the bearing may further include a cage for holding the balls evenly spaced in the raceway between the outer and inner rings of the bearing, thereby preventing the balls from contacting each other and interfering, further improving the stability and running accuracy of the bearing. By providing a cage, the arrangement and rolling trajectory of the balls can be effectively controlled, which helps to reduce noise and frictional resistance during operation, and ensures good bearing performance even when the motor is rotating at high speed.

[0065] This application also protects an electric motor that includes the anti-fretting bearing assembly provided in any of the foregoing embodiments. Specifically, the anti-fretting bearing assembly is installed in a bearing chamber at one end of the motor housing to support the motor rotor and suppress the fretting behavior of the bearing balls 300 in the non-operating state, thereby effectively preventing bearing fretting wear caused by vibration during transportation or stationary periods. The main structure of the anti-fretting bearing assembly includes a bearing, an end cover 400, a buffer pad 500, and an elastic element 600. The bearing includes an outer bearing ring 200, an inner bearing ring 100, and a plurality of balls 300. The balls 300 are rotatably disposed in a raceway 700 formed between the outer bearing ring 200 and the inner bearing ring 100, enabling relative rotational support between the rotor and the stator when the motor is running. Preferably, a first groove 110 is provided around the outer side of the inner bearing ring 100, and a second groove 210 is provided around the inner side of the outer bearing ring 200. The first groove 110 and the second groove 210 are opposite to each other to form a raceway 700 in which the rollers 510 can roll. The end cap 400 is detachably connected to one end of the bearing axially, used to close the bearing port and connect with the elastic element 600 to form a limiting support structure; the buffer pad 500 is disposed between the end cap 400 and the ball 300, and is slidably fitted in the annular cavity between the outer ring 200 and the inner ring 100 of the bearing, used to apply preload pressure toward the ball 300 under the action of the elastic element 600.

[0066] The two ends of the elastic element 600 are connected to the end cap 400 and the buffer pad 500 respectively, and are used to provide elastic restoring force for the buffer pad 500, so that the buffer pad 500 presses against the ball 300, thereby pre-tightening the ball 300 against one side of the raceway 700 when the bearing is not rotating, increasing the static friction between the ball 300 and the raceway 700, effectively suppressing the slight relative movement of the ball 300 when subjected to external disturbances (such as transportation vibration), and avoiding fretting wear and noise generation.

[0067] In specific installation, the inner bearing ring 100 is fitted and fixedly mounted on the motor shaft, enabling integrated rotation with the motor rotor. The outer bearing ring 200 is fixedly mounted in the bearing chamber of the motor housing or stator support structure, providing support and guidance for the motor shaft. By incorporating this anti-fretting bearing assembly, the motor's shock resistance and bearing life are significantly improved during transportation, storage, and standby without affecting the motor's normal operating performance. It is particularly suitable for household or commercial air conditioning systems such as duct fan motors and blower motors, which require long-distance transportation, high precision, and low noise.

[0068] Preferably, the end cap 400 is an electromagnetic generator, and the buffer pad 500 is made of a magnetically conductive material. When the electromagnetic generator is energized, the magnetic attraction force generated by the electromagnetic generator drives the buffer pad 500 to overcome the elastic restoring force of the elastic element 600 and move away from the ball 300. The circuit of the electromagnetic generator is directly connected to the motor circuit. When the electromagnetic generator is energized, it generates a directional magnetic field, forming a magnetic attraction force acting on the buffer pad 500, thereby driving the buffer pad 500 to move away from the ball 300 and overcome the elastic restoring force originally applied by the elastic element 600. This releases the pressure of the buffer pad 500 on the ball 300, allowing the ball 300 to roll freely within the bearing raceway 700, thus ensuring the bearing is in a normal operating state. When the electromagnetic generator is de-energized, the elastic element 600 resumes its function, and the generated elastic restoring force presses the buffer pad 500 against the ball 300 side, so that the ball 300 is subjected to pre-clamping force in the axial direction, thereby realizing the positioning and locking of the ball 300, enhancing the contact friction between the ball 300 and the raceway 700, preventing the ball 300 from making slight movements under external vibration or impact, and suppressing the occurrence of fretting wear.

[0069] The power control circuit of the electromagnetic generator is directly electrically connected to the main circuit of the motor. In other words, the electromagnetic generator and the motor system share the control power supply. When the motor starts, the electromagnetic generator is synchronously energized to release the ball bearing 300. When the motor stops, the electromagnetic generator is de-energized, and the buffer pad 500 automatically resets and presses the ball bearing 300. The entire control process is automated and interconnected, avoiding the need for manual disassembly and assembly of the end cover 400 or separate control by the user, thus improving the ease of use of the system. This design utilizes electromagnetic attraction to achieve automatic switching between the locked and released states of the bearing, offering advantages such as fast response, compact structure, and precise control.

[0070] This application also protects a duct air conditioner, which includes the motor provided in the foregoing embodiments of this application. The motor is provided with an anti-fretting bearing assembly, which supports the motor shaft and suppresses the slight movement of the bearing balls 300 in the raceway 700 when the motor is stopped, transported, or subjected to external vibration, thereby reducing fretting wear and the resulting noise problems and enhancing the reliability and quiet performance of the duct air conditioner.

[0071] Some embodiments in this specification are described in a progressive or parallel manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0072] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fretting-resistant bearing assembly, characterized in that, include: A bearing, comprising an outer ring, an inner ring, and balls, wherein the balls are rotatably disposed in a raceway between the outer ring and the inner ring; An end cap, detachably connected to one end of the bearing axially. A buffer pad is located between the end cap and the ball, and the buffer pad is slidably disposed between the outer ring and the inner ring of the bearing; An elastic element has its two ends connected to the end cap and the buffer pad, respectively. The elastic restoring force generated by the elastic element causes the buffer pad to press against the ball.

2. The anti-fretting bearing assembly according to claim 1, characterized in that, The buffer pad has a circular ring structure.

3. The anti-fretting bearing assembly according to claim 1, characterized in that, The end cap is detachably connected to the outer ring of the bearing, the end cap covers the end face of the inner ring of the bearing, and there is a movable gap between the inner ring of the bearing and the end cap.

4. The anti-fretting bearing assembly according to claim 1, characterized in that, The outer edge of the buffer pad is in movable fit with the inner wall of the outer ring of the bearing, and the inner edge of the buffer pad is in clearance fit with the outer edge of the inner ring of the bearing.

5. The anti-fretting bearing assembly according to claim 4, characterized in that, The outer edge of the buffer pad is fitted with several rollers, which roll in contact with the inner wall of the outer ring of the bearing.

6. The anti-fretting bearing assembly according to any one of claims 1-5, characterized in that, The end cap is an electromagnetic generator, and the buffer pad is made of a magnetic material. When the electromagnetic generator is energized, the magnetic attraction force generated by the electromagnetic generator drives the buffer pad to overcome the elastic restoring force of the elastic element and move away from the ball.

7. The anti-fretting bearing assembly according to claim 6, characterized in that, The elastic element has multiple components evenly distributed in the circumferential direction.

8. The anti-fretting bearing assembly according to claim 6, characterized in that, It also includes a dust cover, which and the end cap are respectively connected to the two ends of the bearing in the axial direction.

9. An electric motor, characterized in that, The invention includes an anti-fretting bearing assembly according to any one of claims 1-8, wherein the inner ring of the bearing is fitted and fixed on the motor shaft of the motor.

10. A ducted air conditioner, characterized in that, Includes the motor as described in claim 9.

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