Shaft extension low-play motor
By adopting a combination design of back-to-back assembly of angular contact bearings, bosses and preloading devices in the motor, the problem of motor shaft extension and squirming is solved, and higher equipment stability and service life are achieved.
Patent Information
- Application Number
- CN202421595639.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-08
AI Technical Summary
When the existing motors are working, due to the inadequate coordination between the bearing and the bearing chamber, it is easy to cause shaft extension and squirm, which will affect the normal operation of the equipment and the life of the motor.
A shaft extension and low-bounce motor is designed, using an angular contact bearing assembled back to back, and a boss and a preloading device are provided in the bearing chamber. The preloading force of the bearing and the stability of the equipment are enhanced by the wave-shaped spring blade as an elastic component.
It effectively reduces the axial movement of the motor, improves the stability and reliability of the equipment, extends the service life, and reduces vibration and noise caused by axial forces.
Smart Images
Figure CN222785856U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric motors, in particular to an electric motor with low shaft extension movement. Background Art
[0002] The structure of the motor covers core components such as the stator, rotor, end cover, and bearings, and undergoes a precise manufacturing and assembly process. Despite this, due to minor errors that may occur during the processing and assembly process, the centers of the stator and rotor cores may not be fully aligned, and the rotor concentricity may not meet the standards. These errors in turn generate axial and radial magnetic pulls. In actual operation, if the radial magnetic pull is too large, it will manifest as motor vibration; and if the axial magnetic pull is too large, it may cause the motor shaft to move.
[0003] In the existing mechanical processing process, the processing size of the end cover bearing chamber is too large, which causes the fit between the bearing and the bearing chamber to be not tight enough, which is easy to cause the movement of the shaft extension. Many devices have shaft connection structures. For example, when water pumps, fans, compressors and other equipment are working, the motor shaft is often affected by the axial force of the equipment. Especially for extended shafts, if the axial movement is too large during operation, the equipment will not operate normally. As the working time of the equipment increases, the axial movement of the extended shaft will continue to increase, which is easy to cause damage to the main machine or motor, which will increase the maintenance workload, equipment loss and operating costs. Utility Model Content
[0004] In order to solve the problem that the existing motor shaft in the prior art is often affected by the axial force of the equipment, and if the axial movement is too large during operation, the equipment will not operate normally and the host or motor will be damaged, the present application provides a shaft extension low movement motor to solve the above problem.
[0005] In order to achieve the above purpose, the technical solution adopted in this application is:
[0006] A low-motion motor comprises a motor, wherein a bearing chamber is provided at the motor shaft extension end, and a bearing outer cover, a bearing group, a bearing inner cover and a pre-tightening device are provided inside the bearing chamber; the bearing outer cover is provided near the motor shaft extension end, the bearing inner cover is provided away from the motor shaft extension end, and the pre-tightening device is provided near the motor shaft extension end for pre-tightening the bearing group; a motor bearing is provided at the non-shaft extension end of the motor, and an elastic component is also provided between the motor bearing and the inner wall of the end cover of the motor.
[0007] As a further improvement of the present invention, the bearing group includes a first bearing and a second bearing, the first bearing and the second bearing are both sleeved on the shaft body of the motor shaft extension, and the first bearing and the second bearing are assembled back to back with a gap, and a boss is also provided inside the bearing chamber, and the boss is clamped inside the gap.
[0008] As a further improvement of the present invention, the first bearing and the second bearing are angular contact bearings, and the contact angle of the angular contact bearings is 25°.
[0009] As a further improvement of the present invention, the stop sizes of the bearing outer cover and the bearing inner cover correspond to the outer diameters of the first bearing and the second bearing, and the first bearing and the second bearing conflict with the stop sizes of the bearing outer cover and the bearing inner cover.
[0010] As a further improvement of the present invention, the boss is convexly formed on the inner top wall of the bearing chamber.
[0011] As a further improvement of the present invention, the pre-tightening device includes a stop washer and a locking nut. At least two locking nuts are provided. The locking nut is provided near the shaft extension end of the motor. The stop washer is provided between the two locking nuts for locking the two locking nuts.
[0012] As a further improvement of the present invention, the elastic component is a wave spring sheet, and the rated pressure of the wave spring sheet is 600N.
[0013] Compared with the prior art, the technical solution provided by the utility model has the following advantages and effects:
[0014] 1. In the present application, inside the bearing chamber, the first bearing and the second bearing are installed in a back-to-back assembly manner. In addition, a boss is provided between the two. In actual operation, as the width of the boss gradually increases, the center of action of the bearing load will move outside the center line of the bearing, resulting in an increase in the span of the bearing load action point, thereby improving the rigidity of the cantilever end. When the shaft is heated and elongated or pulled by an axial force, the bearing clearance will increase accordingly, thereby avoiding the bearing from getting stuck or damaged. Then, the outer cover of the bearing and the inner cover of the bearing are precisely processed so that the stop can effectively lock the outer ring wall of the first bearing and the second bearing, ensuring that the two remain fixed in the axial direction, thereby reducing the possibility of axial movement and improving the stability and reliability of the equipment.
[0015] 2. In this application, both the first bearing and the second bearing are angular contact ball bearings. In actual work, as the speed increases, the contact angle increases, which will further improve the axial load-bearing capacity. The AC25 degree contact angle is selected to ensure that the bearing can adapt to higher axial forces while rotating at high speed. Under the action of the motor axial force, the contact angle will increase accordingly to meet the application requirements. In addition, the angular contact ball bearing also has a lower friction coefficient and higher transmission efficiency, which makes it have lower heat generation and less energy loss when running at high speed.
[0016] 3. In this application, the main function of the preload device is to provide appropriate preload force for the two bearings by tightening the locking nut after the first bearing and the second bearing are correctly installed, thereby ensuring that the bearings are firmly locked without hindering their normal operation. During this process, pressing the card of the retaining washer can keep the locking nut fixed. When the motor generates axial force, the axial expansion of the inner ring of the bearing may cause the preload to decrease, but it will not increase the preload. Such a design effectively reduces the axial movement of the bearing, improves the overall performance and reliability of the equipment, and by controlling the preload, it also reduces the change in bearing clearance caused by the axial force, thereby reducing the vibration and noise that may occur during the operation of the equipment.
[0017] 4. In this application, we selected wave spring sheets as elastic components and increased their rated pressure to 600N, which can increase the preload force of the non-extension end bearing, effectively absorb the residual axial force generated by the extension end, and reduce the axial movement of the motor, thereby ensuring the stable operation of the equipment and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.
[0019] Figure 1 It is a partial cross-sectional view of the utility model.
[0020] Figure 2 yes Figure 1 A partial enlarged view of area A in the middle.
[0021] Figure 3 yes Figure 1 A partial enlarged view of area B in the middle.
[0022] In the figure: 1, electric motor; 10, bearing outer cover; 20, stop washer; 30, locking nut; 40, bearing assembly; 41, first bearing; 42, second bearing; 50, end cover; 60, bearing inner cover; 70, motor bearing; 80, elastic component; 90, boss. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0024] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0026] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0027] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0028] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0029] Example:
[0030] A low-motion shaft extension motor 1 comprises a motor 1, wherein a bearing chamber is provided at the shaft extension end of the motor 1, and a bearing outer cover 10, a bearing group 40, a bearing inner cover 60 and a bearing preload device are provided inside the bearing chamber; the bearing outer cover 10 is provided near the shaft extension end of the motor 1, the bearing inner cover 60 is provided away from the shaft extension end of the motor 1, and the preload device is provided near the shaft extension end of the motor 1 for preload the bearing group 40; a motor bearing 70 is provided at the non-shaft extension end of the motor 1, and an elastic component 80 is further provided between the motor bearing 70 and the inner wall of the end cover 50 of the motor 1, and the elastic component 80 is a wave spring sheet, and the rated pressure of the wave spring sheet is 600N.
[0031] It should be noted that in actual situations, if the axial movement of the motor 1 exceeds the normal range, it will seriously interfere with the normal operation of the equipment and may cause damage to the host or the motor 1. To address this problem, most manufacturers use the method of adding wave spring sheets to suppress axial movement. However, this application not only follows this method, but also further adds a bearing chamber at the shaft extension end of the motor 1. Through the synergistic effect of the bearing group 40 installed in the bearing chamber and the preload device, the axial movement of the motor 1 can be more effectively reduced, thereby improving the stability and durability of the equipment.
[0032] Specifically, the preload device can also automatically adjust according to the operating status of the motor 1 to ensure that the bearing group 40 always remains in the optimal working position, thereby controlling the axial movement in real time. Among them, we selected a wave spring sheet as the elastic component 80 and increased its rated pressure to 600N, which can increase the preload force of the non-shaft extension end bearing, effectively absorb the residual axial force generated by the shaft extension end, and reduce the axial movement of the motor, thereby ensuring the stable operation of the equipment and extending its service life.
[0033] Combined with the accompanying drawings Figure 1 and Figure 3The bearing group 40 includes a first bearing 41 and a second bearing 42. The first bearing 41 and the second bearing 42 are both sleeved on the shaft of the motor 1, and the first bearing 41 and the second bearing 42 are assembled back to back with a gap. A boss 90 is also provided inside the bearing chamber, and the boss 90 is clamped inside the gap.
[0034] It is explained that in the bearing chamber, the first bearing 41 and the second bearing 42 are installed back to back, and a boss 90 is arranged between them. In the actual operation process, as the width of the boss 90 gradually increases, the center of action of the bearing load will gradually shift to the outside of the bearing center line, which leads to an increase in the span of the bearing load action point, thereby enhancing the rigidity of the cantilever end. When the shaft is elongated by heat or pulled by axial force, the bearing clearance will increase accordingly, thereby effectively avoiding the occurrence of bearing jamming or damage.
[0035] Combined with the accompanying drawings Figure 1 and Figure 3 , the first bearing 41 and the second bearing 42 are angular contact bearings, and the contact angle of the angular contact bearing is 25°. In actual work, as the speed increases, the increase in the contact angle will further improve the axial load-bearing capacity. The selection of the AC25 degree contact angle is intended to ensure that the bearing can adapt to higher axial forces while rotating at high speed. Under the action of the axial force of the motor, the contact angle will increase accordingly to meet the application requirements. In order to ensure the stability and reliability of the motor, in addition to selecting the appropriate bearing type and contact angle, the lubrication and cooling of the bearings must also be carefully designed. Proper lubrication can not only reduce the friction and wear of the bearings, but also increase the life and transmission efficiency of the bearings. Effective cooling can prevent the bearings from overheating at high speeds and ensure the stable operation of the bearings.
[0036] It is worth noting that the first bearing 41 and the second bearing 42 are assembled in a back-to-back installation manner. Specifically, the back-to-back installation manner means that the component force of the right bearing is the upper right (lower right), and the component force of the left bearing is the upper left (lower left). In this way, the two bearings are decomposed to resist the axial forces in two directions without moving. Ensure that the bearings do not move. At the same time, the angular contact ball bearings installed back to back can withstand up to several times the radial component force. Since the intersection of the two components of force is relatively close, the disturbance requirement on the shaft is relatively low, thereby reducing the risk of deformation of the shaft under stress. In summary, this installation method helps to reduce axial movement and improve the stability and reliability of equipment operation.
[0037] Combined with the accompanying drawings Figure 1 and Figure 3The stop sizes of the bearing outer cover 10 and the bearing inner cover 60 correspond to the outer diameters of the first bearing 41 and the second bearing 42, and the first bearing 41 and the second bearing 42 are in conflict with the stop sizes of the bearing outer cover 10 and the bearing inner cover 60, and the boss 90 is convexly formed on the inner top wall of the bearing chamber.
[0038] It is explained that after precision processing of the bearing outer cover 10 and the bearing inner cover 60, the stoppers can effectively lock the outer ring walls of the first bearing 41 and the second bearing 42 to ensure that both remain fixed in the axial direction, thereby reducing the possibility of axial movement and improving the stability and reliability of the equipment.
[0039] Combined with the accompanying drawings Figure 1-Figure 3 The pre-tightening device includes a stop washer 20 and a locking nut 30. At least two locking nuts 30 are provided. The locking nuts 30 are provided near the shaft extension end of the motor 1. The stop washer 20 is provided between the two locking nuts 30 for locking the two locking nuts 30.
[0040] It is to be explained that the main function of the preload device is to provide a suitable preload force for the two bearings by tightening the locking nut 30 after the first bearing 41 and the second bearing 42 are correctly installed, thereby ensuring that the bearings are firmly locked without hindering their normal operation. In this process, the locking nut 30 can be kept fixed by pressing the card of the stop washer 20.
[0041] Specifically, when the motor generates axial force, the axial expansion of the inner ring of the bearing may reduce the preload, but it will not increase the preload. This design effectively reduces the axial movement of the bearing, improves the overall performance and reliability of the equipment, and reduces the change in bearing clearance caused by axial force by controlling the preload, thereby reducing the vibration and noise that may occur during equipment operation.
[0042] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A low-shaft-play motor, comprising a motor (1), characterized in that: The shaft extension end of the motor (1) is provided with a bearing chamber, and the interior of the bearing chamber is provided with a bearing outer cover (10), a bearing group (40), a bearing inner cover (60) and a pre-tightening device; The bearing outer cover (10) is arranged near the shaft extension end of the motor (1), the bearing inner cover (60) is arranged away from the shaft extension end of the motor (1), and the pre-tightening device is arranged near the shaft extension end of the motor (1) for pre-tightening the bearing group (40); A motor bearing (70) is provided at the non-axial extension end of the motor (1), and an elastic component (80) is also provided between the motor bearing (70) and the inner wall of the end cover (50) of the motor (1).
2. The low-movement motor with shaft extension according to claim 1 is characterized in that: The bearing group (40) comprises a first bearing (41) and a second bearing (42), wherein the first bearing (41) and the second bearing (42) are both sleeved on the shaft of the motor shaft extension, and the first bearing (41) and the second bearing (42) are assembled back to back with a gap therebetween, and a boss (90) is also arranged inside the bearing chamber, and the boss (90) is clamped inside the gap.
3. The low-movement motor with shaft extension according to claim 2 is characterized in that: The first bearing (41) and the second bearing (42) are angular contact bearings, and the contact angle of the angular contact bearings is 25°.
4. The low-movement motor with shaft extension according to claim 3 is characterized in that: The stop sizes of the bearing outer cover (10) and the bearing inner cover (60) correspond to the outer diameters of the first bearing (41) and the second bearing (42), and the first bearing (41) and the second bearing (42) collide with the stop sizes of the bearing outer cover (10) and the bearing inner cover (60).
5. The shaft extension low play motor according to claim 4, characterized in that: The boss (90) is convexly formed on the inner top wall of the bearing chamber.
6. The shaft extension low play motor according to claim 1 or 5, characterized in that: The pre-tightening device comprises a stop washer (20) and a locking nut (30), at least two of the locking nuts are provided, the locking nut (30) is provided near the shaft extension end of the motor (1), and the stop washer (20) is provided between the two locking nuts (30) for locking the two locking nuts (30).
7. The shaft extension low play motor according to claim 6, characterized in that: The elastic component (80) is a wave spring sheet, and the rated pressure of the wave spring sheet is 600N.