Bearing dismounting mechanism and motor

Abstract

The application provides a bearing detachable mechanism and a motor, and relates to the technical field of motors.The bearing detachable mechanism comprises a sleeve assembly, a steel shaft assembly and at least one bearing arranged in the interior of the sleeve assembly and connecting the sleeve assembly and the steel shaft assembly.The steel shaft assembly comprises a steel shaft body and a first flange arranged at one end of the steel shaft body.The bearing is arranged at the other end of the steel shaft body away from the first flange.The other end of the steel shaft body is detachably connected with a rotor through the first flange.The sleeve assembly is detachably connected with a rear cover.The bearing detachable mechanism is arranged between the rotor and the rear cover of the stator, so that the sleeve assembly is detachably connected with the rear cover, the steel shaft assembly is detachably connected with the rotor, and the combination is realized through the bearing, thereby avoiding the direct connection of the bearing with the rotor and the stator, and even if the bearing is worn, the core structure of the motor will not be damaged directly, and the damaged old bearing or the bearing detachable mechanism can be replaced, so that the whole motor does not need to be scrapped.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a detachable bearing mechanism and a motor. Background Technology

[0002] An electric motor generally consists of a stator and a rotor, which are directly connected by an interference fit using bearings. Specifically, the stator includes a back cover, and the rotor and stator are assembled by pressing the bearings inside the motor directly into the back cover using an interference fit. However, after prolonged use, friction between the bearings and the back cover can cause them to loosen and wear down, and the bearings themselves will also wear down, resulting in an increasing gap between the bearings and the back cover. In this situation, even if the core coils can function normally, the motor will not be able to operate properly because the bearings can no longer be secured, essentially rendering the entire motor unusable.

[0003] In existing technology, to avoid scrapping the entire motor due to bearing failure, the only option is to remove and replace the damaged bearing. However, during the initial assembly, because the bearing is press-fitted directly into the back cover with an interference fit, it is difficult to remove the damaged bearing. Furthermore, even if the damaged bearing can be removed, the back cover will inevitably be damaged, making it impossible to press in a new bearing for replacement. Therefore, in existing technology, the inability to directly replace a damaged bearing renders the entire motor unusable, increasing the cost of motor operation. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a detachable bearing mechanism and a motor, which solves the technical problem in the prior art that the failure of the bearing of a motor requires the scrapping of the entire motor, thus increasing the cost of motor use.

[0005] The present invention provides a detachable bearing mechanism for connecting a stator and a rotor, the stator including a rear cover, and the detachable bearing mechanism comprising:

[0006] The sleeve assembly, the steel shaft assembly, and at least one bearing disposed inside the sleeve assembly and connecting the sleeve assembly and the steel shaft assembly, the steel shaft assembly including a steel shaft body and a first flange disposed at one end of the steel shaft body, the bearing disposed at the end of the steel shaft body away from the first flange, the other end of the steel shaft body being detachably connected to the rotor through the first flange, and the sleeve assembly being detachably connected to the rear cover.

[0007] In addition, the bearing detachable mechanism according to the present invention may also have the following additional technical features:

[0008] Furthermore, the detachable bearing mechanism also includes a first connecting structure, which includes a plurality of first through holes provided on the first flange and a plurality of first connecting members provided on the rotor. The first through holes and the first connecting members are adapted to allow the steel shaft body to be detachably connected to the rotor.

[0009] Furthermore, the sleeve assembly includes a sleeve body and a second flange disposed at one end of the sleeve body, the bearing and the steel shaft body are nested sequentially inside the sleeve body, and the second flange is detachably connected to the rear cover.

[0010] Furthermore, the detachable bearing mechanism also includes a second connection structure, which includes a plurality of second through holes provided in the second flange, a plurality of limiting holes provided in the rear cover, and a plurality of second connecting members. The second through holes are adapted to the limiting holes and are detachably connected to the second connecting members so that the sleeve body is detachably connected to the rear cover.

[0011] Furthermore, the detachable bearing mechanism also includes a heating ring, and the outer wall of the sleeve body is provided with a circular groove, the heating ring being adapted to the circular groove.

[0012] Furthermore, the detachable bearing mechanism includes two bearings, which are located at both ends inside the sleeve body, and the annular groove is located in the middle of the distance between the two bearings.

[0013] Furthermore, the back cover includes a back cover body and a receiving through hole provided in the back cover body, the receiving through hole being used to receive the sleeve body; the inner wall of the receiving through hole is provided with a plurality of ribs, two adjacent ribs forming a groove, the ribs abutting against the sleeve body, the sleeve body and the groove forming a heat dissipation channel.

[0014] Furthermore, the rear cover body is provided with a wire through hole, which is connected to the receiving through hole.

[0015] Furthermore, the detachable bearing mechanism also includes a locking element, which is located at the end of the steel shaft body away from the first flange and is detachably connected to the steel shaft body to lock the steel shaft body and the bearing to prevent the steel shaft body from loosening;

[0016] The locking component includes a washer and a nut. The end of the steel shaft body away from the first flange is threaded. The washer is sleeved on the steel shaft body. The nut is screwed into the thread and, together with the washer, fixes the steel shaft body and the bearing. The outer diameter of the washer is between the outer diameter and the inner diameter of the bearing.

[0017] In another aspect, the present invention provides an electric motor including a stator and a rotor, the electric motor further including the aforementioned bearing detachable mechanism, the bearing detachable mechanism connecting the stator and the rotor.

[0018] The aforementioned detachable bearing mechanism and motor, by adding the detachable bearing mechanism between the rotor and the stator rear cover, allow the sleeve assembly to be detachably connected to the rear cover, and the steel shaft assembly to be detachably connected to the rotor, and then assembled through the bearing. This avoids the bearing directly connecting the rotor and stator, so even if the bearing wears, it will not directly damage the core structure of the motor. Only the damaged old bearing needs to be replaced or the entire detachable bearing mechanism needs to be replaced. Furthermore, since the sleeve assembly and the rear cover, as well as the steel shaft assembly and the rotor, are detachably connected, the replacement operation is also convenient, without the need to scrap the entire motor. This solves the technical problem of high operating costs caused by the need to scrap the entire motor due to bearing damage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the bearing detachable mechanism in the first embodiment of the present invention;

[0020] Figure 2 for Figure 1 Top view;

[0021] Figure 3 for Figure 2 Sectional view of AA;

[0022] Figure 4 for Figure 1 Exploded view of the structure;

[0023] Figure 5 This is a schematic diagram of the structure of the back cover body in the first embodiment of the present invention;

[0024] Figure 6 for Figure 5 Top view;

[0025] Figure 7 for Figure 6 Sectional view of BB;

[0026] Figure 8 for Figure 6 A magnified view of a portion of region M in the middle;

[0027] Figure 9 This is a schematic diagram of the steel shaft assembly in the first embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the sleeve assembly in the first embodiment of the present invention;

[0029] Figure 11 for Figure 10 Side view;

[0030] Figure 12 for Figure 11 Sectional view of CC;

[0031] Explanation of key component symbols:

[0032]

[0033] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0034] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0035] 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.

[0036] 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 in the description of the invention 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.

[0037] To facilitate understanding of the present invention, several embodiments are given below. However, the present invention 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 the present invention will be more thorough and complete.

[0038] Example 1

[0039] Please see Figures 1-12 The image shows a detachable bearing mechanism in the first embodiment of the present invention, used to connect the stator and the rotor. The stator includes a rear cover, and the detachable bearing mechanism includes:

[0040] The sleeve assembly 200, the steel shaft assembly 100, and at least one bearing 400 disposed inside the sleeve assembly 200 and connecting the sleeve assembly 200 and the steel shaft assembly 100 are included. The steel shaft assembly 100 includes a steel shaft body 110 and a first flange 120 disposed at one end of the steel shaft body 110. The bearing 400 is disposed at the end of the steel shaft body 110 away from the first flange 120. The other end of the steel shaft body 110 is detachably connected to the rotor through the first flange 120. The sleeve assembly 200 is detachably connected to the rear cover.

[0041] To facilitate a smooth connection between the steel shaft body 110 and the rotor, in this embodiment, the bearing detachable mechanism further includes a first connecting structure for detachably connecting the rotor and the steel shaft body 110, enabling efficient disassembly and assembly when the bearing 400 needs replacement due to wear. Specifically, the first connecting structure includes multiple first through holes 130 located on the first flange 120 and multiple first connecting members located on the rotor. Specifically, the first connecting member can be a connecting rod connected to the rotor. The first connecting rod is adapted to the first connecting member through the first through holes 130 and coupled with a nut to allow the steel shaft body 110 to be detachably connected to the rotor.

[0042] In this embodiment, the sleeve assembly 200 includes a sleeve body 210 and a second flange 220 disposed at one end of the sleeve body 210. The second flange 220 is detachably connected to the rear cover. The bearing 400 and the steel shaft body 110 are nested in the sleeve body 210 in sequence. It can be understood that the outer ring of the bearing 400 is interference-fitted with the sleeve body 210, and the inner ring of the bearing 400 is interference-fitted with the steel shaft body 110, thereby realizing the fixed installation of the sleeve body 210, the bearing 400 and the steel shaft body 110 to form a working whole.

[0043] Furthermore, to ensure the assembly of the sleeve assembly 200 with the rear cover, the bearing detachable mechanism also includes a second connecting structure, through which the sleeve assembly 200 and the rear cover can be detachably connected. Specifically, the second connecting structure includes multiple second through holes 240 provided in the second flange 220, multiple limiting holes 530 provided in the rear cover, and multiple second connecting members. The second through holes 240 are adapted to the limiting holes 530 and are detachably connected to the second connecting members so that the sleeve body 210 can be detachably connected to the rear cover. In this embodiment, the second connecting member can be a bolt, which passes through the second through holes 240 and is screwed into the limiting holes 530 to achieve the assembly of the second flange 220 and the rear cover, that is, the sleeve assembly 200 is assembled on the rear cover.

[0044] In extremely low temperature environments, when the drone motor's overall temperature is the same as the ambient temperature before startup, the grease inside the bearing 400 also solidifies due to the low temperature. This results in very high resistance when the motor starts, significantly affecting startup and potentially causing startup failure. If a large current is forcibly applied to increase the rotational torque, the unsoftened grease can damage the steel balls inside the bearing 400 and the raceways of the inner and outer rings. To avoid raceway damage caused by unsoftened grease during cold starts in extremely low temperature environments, in this embodiment, the detachable bearing mechanism also includes a heating ring 300. The outer wall of the sleeve body 210 has a circular groove 230, which is fitted to the heating ring 300. As a specific example, the detachable bearing mechanism includes two bearings 400 located at both ends inside the sleeve body 210. Specifically, for better positioning and installation of the bearings 400, the sleeve body 210 has two receiving grooves 250 inside, where the bearings 400 are located. Furthermore, the annular groove 230 is located in the middle of the distance between the two bearings 400. As a specific example, the heating ring 300 is a heating resistor element. Before the motor starts, the heating resistor is pre-energized to generate heat, which is conducted to the sleeve body 210 and then to the two bearings 400, causing the grease inside the bearings 400 to heat up and soften, thus allowing the motor to start normally. Furthermore, the heating resistor no longer needs to operate once the motor's overall operating coil and core have generated sufficient heat to maintain the temperature of the grease. If the ambient temperature is low and the motor itself does not generate enough heat to maintain the suitable lubrication temperature of the grease inside the bearings 400, then it will start operating.

[0045] In order to smoothly install the sleeve body 210 into the rear cover of the stator without affecting the assembly clearance between the rotor and the stator, in this embodiment, the rear cover includes a rear cover body 500 and a receiving through hole 510 provided in the rear cover body 500. The receiving through hole 510 is used to receive the sleeve body 210, so that the sleeve body 210 is disposed inside the rear cover body 500, thereby ensuring the assembly clearance between the rotor and the stator.

[0046] Since the bearing 400 is directly press-fitted onto the stator back cover via an interference fit, the outer ring of the bearing 400 is in direct contact with the inner wall of the sleeve body 210, and the outer wall of the sleeve body 210 is also in direct contact with the inner wall of the through hole 510 in the back cover body 500. Therefore, when the heat dissipated by the iron core and coil windings in the motor is transferred to the stator back cover body 500, it is very easy to conduct to the bearing 400 through the directly contacting sleeve body 210. At this time, the high temperature will cause the viscosity of the grease in the bearing 400 to become thinner, which is not conducive to the lubrication of the steel balls and raceways in the bearing 400. Moreover, if the temperature continues to rise, the grease is very likely to become liquid and overflow from the bearing 400, causing the grease to be lost and further deteriorating the lubrication of the bearing 400. Therefore, if the sleeve body 210, the rear cover body 500, and the bearing 400 are all in direct contact with each other, heat transfer is very likely to occur, causing the grease in the bearing 400 to become thinner and overflow, thus causing the bearing 400 to fail to lubricate.

[0047] Therefore, to prevent grease loss due to high temperature and subsequent lubrication failure of the bearing 400, in this embodiment, the inner wall of the through hole 510 is provided with several ribs 520. Adjacent ribs 520 form a groove. The ribs 520 abut against the sleeve body 210 to assemble the sleeve body 210 with the rear cover body 500. The sleeve body 210 and the groove form a heat dissipation channel. This allows the ribs 520 to change the direct, full-surface contact between the sleeve body 210 and the rear cover body 500 to intermittent, partial contact. Furthermore, the heat dissipation channel formed by the groove can also carry away the heat dissipated by the iron core and coil windings, thereby limiting heat transfer to the bearing 400 and ensuring adequate lubrication of the grease within the bearing 400.

[0048] As a concrete example, temperature probes are used to measure the temperatures of the heating resistor and the sleeve assembly 200. Specifically, temperature probes are placed on the outer walls of both the heating resistor and the sleeve body 210 to monitor their temperatures. The control circuit adjusts and switches the heating power based on the measured temperatures using a given algorithm. When the UAV is powered on, the control circuit determines whether the heating resistor needs to initiate the heating process based on whether the measured temperature of the sleeve assembly 200 is lower than the grease's starting temperature. After heating, if the temperature of the sleeve assembly 200 exceeds a preset value, the heating resistor stops heating and sends a signal to the UAV flight controller indicating that the bearing 400 preheating process is complete. The UAV flight controller then restarts and runs the motor to prevent damage to the steel balls inside the bearing 400 and the raceways of the inner and outer rings of the bearing 400, or motor starting failure. It should be further noted that after the motor starts running, the heating element generally does not heat up, except in extremely cold regions. Although the motor itself can generate heat, if the heat output is insufficient and the temperature of the sleeve assembly 200 is lower than the preset value, the heating element will also be activated. This avoids the problem in cold climates where the drone motor's temperature is too low before operation and the lubricant hardens, resulting in a high starting torque that prevents the motor from running. During flight, when the motor is already running normally and generating its own heat, the heating resistor, acting as a heat source, does not function.

[0049] In this embodiment, the ribs 520 are designed to form grooves, which significantly reduces the effective contact area between the outer wall of the sleeve body 210 and the inner wall of the stator rear cover body 500 that accommodates the through hole 510. The beneficial effects include: on the one hand, since the outer wall of the sleeve body 210 and the inner wall of the through hole 510 are in transition fit, the contact area between the sleeve body 210 and the rear cover body 500 is reduced, making it easier for the bearing detachable mechanism to be installed or removed from the rear cover body 500, thereby facilitating the replacement or maintenance of the bearing detachable mechanism; on the other hand, the significantly reduced contact area can greatly reduce the heat transfer between the original walls of the two, so when the heat source of the motor is at a high temperature, the temperature of the bearing detachable mechanism will not be affected too much, and a lower temperature can be maintained so that the bearing 400 grease works in a favorable design state, maximizing the service life of the bearing 400.

[0050] In some optional embodiments, an annular heat insulation sleeve may be added between the sleeve body 210 and the rear cover body 500 to prevent the sleeve body 210 from directly contacting the rear cover body 500, so as to limit the heat transfer from the rear cover body 500 to the sleeve body 210. The annular heat insulation sleeve is made of heat insulation material.

[0051] Since the heating ring 300 is located inside the rear cover body 500, to ensure power supply to the heating resistor, as a specific example, the rear cover body 500 is provided with a wire through hole 600, which connects to the receiving through hole 510. This allows the wire to be transmitted through the wire through hole 600 to the receiving through hole 510, and then connected to the heating ring 300 on the outer wall of the sleeve body 210 to achieve power supply.

[0052] To further ensure a stable connection between the steel shaft body 110 and the sleeve body 210, and to prevent the steel shaft body 110 from loosening due to prolonged operation, in this embodiment, the detachable bearing mechanism also includes a locking component. The locking component is located at the end of the steel shaft body 110 furthest from the first flange 120 and is detachably connected to the steel shaft body 110 to lock the steel shaft body 110 and the bearing 400 to prevent the steel shaft body 110 from loosening. Specifically, the locking component includes a washer (not shown) and a nut (not shown). The end of the steel shaft body 110 furthest from the first flange 120 has a threaded portion 140, with threads on the outer side of the threaded portion 140. The washer is fitted onto the steel shaft body 110, and the nut is screwed into the thread and, together with the washer, secures the steel shaft body 110 and the bearing 400. The outer diameter of the washer is between the outer diameter and the inner diameter of the bearing 400.

[0053] In summary, the bearing detachable mechanism in the above embodiments of the present invention, by adding the bearing detachable mechanism between the rotor and the stator rear cover, allows the sleeve assembly to be detachably connected to the rear cover, the steel shaft assembly to be detachably connected to the rotor, and then assembled through the bearing, avoiding the direct connection of the bearing to the rotor and the stator. Even if the bearing wears, it will not directly damage the core structure of the motor. Only the damaged old bearing needs to be replaced or the entire bearing detachable mechanism needs to be replaced. Furthermore, since the sleeve assembly and the rear cover, as well as the steel shaft assembly and the rotor, are detachably connected, the replacement operation is also convenient, without the need to scrap the entire motor. This solves the technical problem of high operating costs caused by the need to scrap the entire motor due to bearing damage.

[0054] Example 2

[0055] The second embodiment of the present invention provides an electric motor, including a stator, a rotor, and a bearing detachable mechanism as described in the above embodiment, wherein the bearing detachable mechanism connects the stator and the rotor.

[0056] In the description of this specification, 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 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.

[0057] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A detachable bearing mechanism for connecting a stator and a rotor, characterized in that, The stator includes a rear cover, and the bearing detachable mechanism includes: The sleeve assembly, the steel shaft assembly, and at least one bearing disposed inside the sleeve assembly and connecting the sleeve assembly and the steel shaft assembly, the steel shaft assembly including a steel shaft body and a first flange disposed at one end of the steel shaft body, the bearing disposed at the end of the steel shaft body away from the first flange, the other end of the steel shaft body being detachably connected to the rotor through the first flange, and the sleeve assembly being detachably connected to the rear cover; The sleeve assembly includes a sleeve body and a heating ring. The outer wall of the sleeve body is provided with a circular groove, and the heating ring is adapted to the circular groove. The heating ring is a heating resistor element.

2. The bearing detachable mechanism according to claim 1, characterized in that, The detachable bearing mechanism further includes a first connecting structure, which includes a plurality of first through holes provided on the first flange and a plurality of first connecting members provided on the rotor. The first through holes and the first connecting members are adapted to allow the steel shaft body to be detachably connected to the rotor.

3. The bearing detachable mechanism according to claim 1, characterized in that, The sleeve assembly further includes a second flange located at one end of the sleeve body, the bearing and the steel shaft body being nested sequentially within the sleeve body, and the second flange being detachably connected to the rear cover.

4. The bearing detachable mechanism according to claim 3, characterized in that, The detachable bearing mechanism further includes a second connection structure, which includes a plurality of second through holes provided in the second flange, a plurality of limiting holes provided in the rear cover, and a plurality of second connecting members. The second through holes are adapted to the limiting holes and are detachably connected to the second connecting members so that the sleeve body is detachably connected to the rear cover.

5. The bearing detachable mechanism according to claim 1, characterized in that, The detachable bearing mechanism includes two bearings, which are located at both ends inside the sleeve body, and the annular groove is located in the middle of the distance between the two bearings.

6. The bearing detachable mechanism according to claim 3, characterized in that, The back cover includes a back cover body and a receiving through hole provided in the back cover body. The receiving through hole is used to receive the sleeve body. The inner wall of the receiving through hole is provided with a plurality of ribs. Two adjacent ribs form a groove. The ribs abut against the sleeve body. The sleeve body and the groove form a heat dissipation channel.

7. The bearing detachable mechanism according to claim 6, characterized in that, The rear cover body is provided with a wire through hole, which is connected to the receiving through hole.

8. The bearing detachable mechanism according to claim 1, characterized in that, The detachable bearing mechanism further includes a locking element, which is located at the end of the steel shaft body away from the first flange and is detachably connected to the steel shaft body to lock the steel shaft body and the bearing to prevent the steel shaft body from loosening; The locking component includes a washer and a nut. The end of the steel shaft body away from the first flange is threaded. The washer is sleeved on the steel shaft body. The nut is screwed into the thread and, together with the washer, fixes the steel shaft body and the bearing. The outer diameter of the washer is between the outer diameter and the inner diameter of the bearing.

9. An electric motor, comprising a stator and a rotor, characterized in that, The motor further includes a bearing detachable mechanism as described in any one of claims 1-8, wherein the bearing detachable mechanism connects the stator and the rotor.

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