Anti-play structure of rotating shaft
By combining the rotor, rear bearing, and fastening end ring, the problem of axial movement of the motor rotor is solved, achieving stable operation and extended lifespan of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 浙江卧龙伺服技术有限公司
- Filing Date
- 2025-05-14
- Publication Date
- 2026-04-24
AI Technical Summary
Existing motors are prone to axial movement of the rotor due to external forces during operation, which affects operational stability and is difficult to control effectively.
The rotor, rear bearing, rear end cover, and fastening end ring are combined to fix the rear bearing, restrict the movement of the inner and outer rings of the bearing, and prevent the rotor shaft from moving.
It effectively prevents rotor axial movement, improves the stability and lifespan of the motor, reduces wear, and enables real-time angle detection.
Smart Images
Figure CN224164727U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor manufacturing technology, and in particular to a shaft anti-slip structure. Background Technology
[0002] An electric motor is a device used to convert electrical energy into mechanical energy. The main function of an electric motor in a circuit is to generate driving torque. As a power source for electrical appliances or various machines, when the motor is running, it may be affected by external forces or due to excessive operating frequency, which may cause the motor shaft or even the motor body to vibrate significantly and exhibit erratic movement. If not dealt with in time, this can easily lead to collision damage and affect the stability of operation.
[0003] Currently, there are various types of motors on the market, but many control motors have high requirements for axial movement, the smaller the better, in order to meet customer needs. At present, many motors use axial shims to eliminate gaps, but such gaps are difficult to control, resulting in low production efficiency and unstable quality.
[0004] Therefore, how to avoid the influence of axial movement of the motor rotor is a technical problem that needs to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of this invention is to provide a shaft anti-axial movement structure that can prevent the axial movement of the motor rotor.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A shaft anti-slip structure includes: a rotor and a rear bearing, a rear end cover, and a fastening end ring sequentially sleeved on one end of the rotor shaft. The rear bearing includes an inner bearing ring and an outer bearing ring. The outer bearing ring is engaged in the bearing chamber of the rear end cover, and the inner bearing ring is engaged between the rotor and the fastening end ring. The fastening end ring is fastened to the rotor shaft.
[0008] Preferably, the rear end cover is an annular structure, with an annular protrusion protruding toward the rotor on its inner circumference, and the bearing chamber is located on the inner wall of the annular protrusion.
[0009] Preferably, an annular stop ring is provided at the end of the bearing housing away from the rotor. The annular stop ring is used to abut against the outer ring of the bearing to restrict its movement in the direction away from the rotor.
[0010] Preferably, an annular groove is provided on the side of the bearing housing away from the annular stop ring, and a retaining spring is installed in the annular groove. The retaining spring abuts against the outer ring of the bearing to restrict the movement of the outer ring of the bearing in the direction close to the rotor.
[0011] Preferably, a stepped positioning platform is provided at one end of the rotor shaft near the rear end cover. The positioning platform is used to abut against the side of the bearing inner ring near the rotor to restrict the movement of the bearing inner ring in the direction close to the rotor.
[0012] Preferably, the fastening end ring is fixed to the rotor shaft by a heat-shrinking process, and the fastening end ring abuts against the side of the bearing inner ring away from the rotor, so as to restrict the movement of the bearing inner ring in the direction away from the rotor.
[0013] Preferably, the rear bearing and the bearing housing are fitted with a clearance fit.
[0014] Preferably, a washer is provided in the bearing housing, the washer being located between the rear bearing and the rear end cover, the washer being made of rubber, and the washer being used to reduce wear between the rear bearing and the rear end cover.
[0015] Preferably, the fastening end ring has a threaded hole and an outer stop on the side opposite to the rotor. The outer stop is used to install a sensor. The sensor has a ring structure, with its inner circumference fitted around the outer circumference of the outer stop. The sensor also has a screw hole that mates with the threaded hole to facilitate the fixed connection between the sensor and the fastening end ring. The sensor is used to detect the rotation angle of the rotor.
[0016] Preferably, a pressure sensor is provided in the bearing housing, the pressure sensor being located between the outer ring of the bearing and the annular stop ring, the pressure sensor being used to detect the axial force of the rear bearing.
[0017] Compared with the above-mentioned background technology, the present invention provides a shaft anti-slip structure, including: a rotor and a rear bearing, a rear end cover and a fastening end ring sequentially sleeved on one end of the rotor shaft. The rear bearing includes an inner bearing ring and an outer bearing ring. The outer bearing ring is snapped into the bearing chamber of the rear end cover, and the inner bearing ring is snapped between the rotor and the fastening end ring. The fastening end ring is fastened to the rotor shaft.
[0018] Specifically, one end of the rotor shaft, which is inserted through the middle of the rotor, passes through the rear bearing, the rear end cover, and the fastening end ring in sequence. The outer ring of the rear bearing is precisely engaged with the bearing chamber of the rear end cover, while the inner ring of the bearing is precisely engaged between the rotor and the fastening end ring. It should be noted that in this embodiment, the rear end cover is fixedly installed at one end of the housing, and the fastening end ring is also fixed at the end of the rotor shaft. In this way, the rear bearing is firmly installed at the end of the rotor through the cooperation of the rear end cover and the fastening end ring, which prevents the rotor shaft, which is fitted in the middle, from moving axially at will, thereby improving the stability of the motor during operation. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the overall structure of the anti-slip joint of the rotating shaft provided in an embodiment of the present utility model;
[0021] Figure 2 An exploded view of the anti-slip structure for the rotating shaft provided in this embodiment of the utility model;
[0022] Figure 3 This is a cross-sectional view of the anti-slip structure of the rotating shaft provided in an embodiment of the present utility model;
[0023] Figure 4 This is a schematic diagram of the rotor structure provided in an embodiment of the present utility model;
[0024] Figure 5 This is a schematic diagram of the rear cover structure provided in an embodiment of the present utility model;
[0025] Figure 6 for Figure 5 Another structural diagram;
[0026] Figure 7 This is a cross-sectional view of the rear end cover provided in an embodiment of the present utility model;
[0027] Figure 8 This is a schematic diagram of the fastening end ring structure provided in an embodiment of the present utility model;
[0028] Figure 9 for Figure 8 Another structural diagram;
[0029] Figure 10 This is a schematic diagram of the sensor structure provided in an embodiment of the present invention.
[0030] in:
[0031] 100 - Rotor, 110 - Rotor shaft, 120 - Positioning table;
[0032] 200 - rear bearing, 210 - bearing inner ring, 220 - bearing outer ring;
[0033] 300-Rear end cover, 310-Bearing chamber, 320-Annular protrusion, 330-Annular stop ring, 340-Annular groove, 350-Snap ring;
[0034] 400 - Fastening end ring, 410 - Threaded hole, 420 - External stop;
[0035] 500 - Sensor, 510 - Screw hole. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0038] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.
[0039] The purpose of this invention is to provide a shaft anti-axial movement structure that can prevent the axial movement of the motor rotor.
[0040] To achieve the above objectives, the present invention provides the following technical solution:
[0041] Please see Figures 1 to 9 This embodiment provides a shaft anti-slip structure, including: a rotor 100 and a rear bearing 200, a rear end cover 300 and a fastening end ring 400 sequentially sleeved on one end of a rotor shaft 110 of the rotor 100. The rear bearing 200 includes an inner bearing ring 210 and an outer bearing ring 220. The outer bearing ring 220 is engaged in the bearing chamber 310 of the rear end cover 300, and the inner bearing ring 210 is engaged between the rotor 100 and the fastening end ring 400. The fastening end ring 400 is fastened to the rotor shaft 110.
[0042] Specifically, one end of the rotor shaft 110, which is inserted through the middle of the rotor 100, passes through the rear bearing 200, the rear end cover 300, and the fastening end ring 400 in sequence. The outer ring 220 of the rear bearing 200 is precisely engaged within the bearing chamber 310 of the rear end cover 300, while the inner ring 210 is precisely engaged between the rotor 100 and the fastening end ring 400. It should be noted that in this embodiment, the rear end cover 300 is fixedly installed at one end of the housing, and the fastening end ring 400 is also fixed at the end of the rotor shaft 110. In this way, the rotor 100 is rotatably mounted in the middle of the rear end cover 300, and the rear bearing 200 is firmly installed at the end of the rotor 100 through the cooperation of the rear end cover 300 and the fastening end ring 400. This prevents the rotor shaft 110, which is fitted in the middle, from moving axially at will. As a result, the rotor 100 can rotate normally without shaking within the housing, thus improving the stability of the motor during operation.
[0043] Preferably, the rear end cover 300 has an annular structure, with an annular protrusion 320 protruding toward the rotor 100 on its inner circumference, and the bearing chamber 310 is located on the inner wall of the annular protrusion 320.
[0044] Specifically, such as Figures 5 to 7 As shown, the outer periphery of the rear end cover 300 can be fixedly installed on the end of the housing. The middle part is provided with a through hole for installing the rear bearing 200. In order to stably install the rear bearing 200, an annular protrusion 320 facing inward is provided at the through hole in the middle part, that is, facing the rotor 100. The annular protrusion 320 has a certain width. The bearing chamber 310 is provided on the inner wall surface of the annular protrusion 320. The bearing outer ring 220 is fixed in the bearing chamber 310 and will abut against the inner wall of the bearing chamber 310.
[0045] Preferably, an annular stop ring 330 is provided at the end of the bearing housing 310 away from the rotor 100. The annular stop ring 330 is used to abut against the outer ring 220 of the bearing to restrict its movement in the direction away from the rotor 100.
[0046] Understandably, in order to prevent the rear bearing 200 inside the bearing housing 310 from moving outward, such as... Figures 5 to 7 As shown, an annular stop ring 330 is provided at the right end of the bearing housing 310; in addition, in order to prevent the annular stop ring 330 from affecting the normal operation of the rear bearing 200, the inner diameter of the annular stop ring 330 should be larger than the inner diameter of the bearing outer ring 220 and smaller than the outer diameter of the bearing inner ring 210.
[0047] Preferably, an annular groove 340 is provided on the side of the bearing housing 310 away from the annular stop ring 330. The annular groove 340 is used to install a retaining ring 350, which abuts against the bearing outer ring 220 to restrict the movement of the bearing outer ring 220 in the direction close to the rotor 100.
[0048] Furthermore, in order to prevent the rear bearing 200 in the bearing housing 310 from moving away from the annular stop ring 330, a narrow annular groove 340 is provided at the left end of the bearing housing 310. After the rear bearing 200 is installed in the bearing housing 310, a retaining ring 350 can be installed in the annular groove 340. The retaining ring 350 can then engage with the other side of the bearing outer ring 220, preventing it from moving.
[0049] Therefore, in this embodiment, by setting an annular stop ring 330 and a snap ring 350 in the bearing chamber 310 to limit the bearing outer ring 220, the bearing outer ring 220 is firmly connected to the rear end cover 300. Since the rear end cover 300 is fixedly installed on the housing, and the bearing inner ring 210 is fixedly sleeved on the rotor shaft 110, the rotor 100 as a whole will not move axially.
[0050] Preferably, a stepped positioning platform 120 is provided at one end of the rotor shaft 110 near the rear end cover 300. The positioning platform 120 is used to abut against the side of the bearing inner ring 210 near the rotor 100 to restrict the movement of the bearing inner ring 210 in the direction close to the rotor 100.
[0051] Similarly, to further limit the positioning of the bearing inner ring 210, a stepped positioning platform 120 is provided on the outer periphery of the rotor shaft 110, specifically as follows: Figures 2 to 4 As shown, the outer diameter of the positioning table 120 is larger than the diameter of the rotor shaft 110, and the positioning table 120 can just abut against the inner ring 210 of the bearing without affecting the normal operation of the outer ring 220 of the bearing.
[0052] Preferably, the fastening end ring 400 is fixed to the rotor shaft 110 by a heat fitting process, and the fastening end ring 400 abuts against the side of the bearing inner ring 210 away from the rotor 100 to restrict the movement of the bearing inner ring 210 in the direction away from the rotor 100.
[0053] Furthermore, in order to restrict the inner ring 210 of the bearing from moving away from the rotor 100, a fastening end ring 400 is fitted on the rotor shaft 110 at a position outside the inner ring 210 of the bearing, and the fastening end ring 400 is located exactly in the center of the rear end cover 300 when installed.
[0054] In this embodiment, in order to prevent the fastening end ring 400 from moving and causing the restriction on the rear bearing 200 to loosen, the fastening end ring 400 and the rotor shaft 110 are interference fit. In addition, the fastening end ring 400 can be assembled by heat fitting process. This assembly method will not damage the parts and can also complete the installation of the fastening end ring 400 smoothly.
[0055] like Figure 3 As shown, in this embodiment, the rear bearing 200 is installed in the bearing chamber 310 of the rear end cover 300, and the outer ring 220 of the bearing is limited by the retaining ring 350 and the annular stop ring 330 installed in the annular groove 340, while the inner ring 210 of the bearing is limited by the positioning table 120 and the fastening end ring 400. With this configuration, since the rear end cover 300 is fixedly installed on the housing, the outer ring 220 of the bearing will not move, and the inner ring 210 of the bearing will not wobble. Since the rotor 100 is engaged with the inner ring 210 of the bearing through the positioning table 120 and the fastening end ring 400, the rotor 100 will not move axially, thereby ensuring the stability of the motor operation.
[0056] Preferably, the rear bearing 200 and the bearing housing 310 are fitted with a clearance fit.
[0057] In this embodiment, in order to ensure that the rear bearing 200 can be smoothly installed into the bearing housing 310, a rear bearing 200 with an outer diameter of outer ring 220 slightly smaller than the inner diameter of bearing housing 310 can be selected. The gap between the two is only required to ensure that the rear bearing 200 can be smoothly installed.
[0058] Preferably, a washer is provided in the bearing housing 310, the washer being located between the rear bearing 200 and the rear end cover 300. The washer is made of rubber and is used to reduce wear between the rear bearing 200 and the rear end cover 300.
[0059] Understandably, in one possible embodiment, a ring-shaped rubber washer can be installed inside the bearing housing 310, specifically between the annular stop ring 330 and the side wall of the bearing outer ring 220. In this way, the rubber washer can not only provide axial buffering for the rotor shaft 110, that is, absorb axial axial force through the rubber washer and improve the stability of motor operation, but also reduce the wear between the rear bearing 200 and the rear end cover 300, thereby extending their service life.
[0060] Preferably, the fastening end ring 400 has a threaded hole 410 and an outer stop 420 on the side opposite to the rotor 100. The outer stop 420 is used to install the sensor 500. The sensor 500 has a ring structure, with its inner circumference fitted around the outer circumference of the outer stop 420. The sensor 500 also has a screw hole 510 that mates with the threaded hole 410 to facilitate the fixed connection between the sensor 500 and the fastening end ring 400. The sensor 500 is used to detect the rotation angle of the rotor 100.
[0061] In one possible embodiment, to facilitate real-time detection of the motor's rotation angle, a ring-shaped sensor 500 is installed on the outer side of the fastening end ring 400, specifically as follows: Figure 10 As shown, the fastening end ring 400 is specifically as follows: Figures 7 to 9 As shown, a ring-shaped outer stop 420 is provided in the middle, and the sensor 500 is sleeved on the outer circumference of the outer stop 420. In order to securely connect the two, a threaded hole 410 is provided on the outer side of the fastening end ring 400, and a screw hole 510 is provided at the corresponding position of the sensor 500. Then, the sensor 500 is installed on the fastening end ring 400 by screws.
[0062] Preferably, a pressure sensor 500 is installed in the bearing housing 310. The pressure sensor 500 is located between the outer ring 220 of the bearing and the annular stop ring 330. The pressure sensor 500 is used to detect the axial force of the rear bearing 200.
[0063] In one possible embodiment, a piezoelectric pressure sensor 500 can be disposed between the outer ring 220 of the bearing and the annular stop ring 330. The pressure sensor 500 can detect the axial force of the motor rotor 100, thereby adjusting the motor's operating state; or, based on the pressure detected by the pressure sensor 500, it can determine if the bearing 200's engagement has loosened, thereby improving the stability of the motor's operation. It should be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.
[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0065] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.
Claims
1. A shaft anti-slip structure, characterized in that, include: The rotor (100) and a rear bearing (200), a rear end cover (300) and a fastening end ring (400) are sequentially sleeved on one end of the rotor shaft (110) of the rotor (100). The rear bearing (200) includes an inner bearing ring (210) and an outer bearing ring (220). The outer bearing ring (220) is engaged in the bearing chamber (310) of the rear end cover (300). The inner bearing ring (210) is engaged between the rotor (100) and the fastening end ring (400). The fastening end ring (400) is fastened to the rotor shaft (110).
2. The anti-slip structure for rotating shafts according to claim 1, characterized in that, The rear end cover (300) is an annular structure, and its inner circumference is provided with an annular protrusion (320) protruding towards the rotor (100), and the bearing chamber (310) is located on the inner wall of the annular protrusion (320).
3. The anti-axial movement structure for the rotating shaft according to claim 2, characterized in that, An annular stop ring (330) is provided at one end of the bearing housing (310) away from the rotor (100). The annular stop ring (330) is used to abut against the outer ring (220) of the bearing to restrict its movement in the direction away from the rotor (100).
4. The anti-rotation structure for the rotating shaft according to claim 3, characterized in that, An annular groove (340) is provided on the side of the bearing housing (310) away from the annular stop ring (330). The annular groove (340) is used to install a retaining ring (350). The retaining ring (350) abuts against the outer ring of the bearing (220) to restrict the outer ring of the bearing (220) from moving in the direction close to the rotor (100).
5. The anti-axial movement structure for the rotating shaft according to claim 2, characterized in that, The rotor shaft (110) is provided with a stepped positioning platform (120) at one end near the rear end cover (300). The positioning platform (120) is used to abut against the side of the bearing inner ring (210) near the rotor (100) to restrict the movement of the bearing inner ring (210) in the direction close to the rotor (100).
6. The anti-axial movement structure for the rotating shaft according to claim 5, characterized in that, The fastening end ring (400) is fixed to the rotor shaft (110) by a heat fitting process, and the fastening end ring (400) abuts against the side of the bearing inner ring (210) away from the rotor (100) to restrict the movement of the bearing inner ring (210) in the direction away from the rotor (100).
7. The anti-axial movement structure for the rotating shaft according to claim 2, characterized in that, The rear bearing (200) and the bearing housing (310) are fitted with a clearance fit.
8. The anti-axial movement structure for the rotating shaft according to claim 2, characterized in that, A gasket is provided in the bearing housing (310), the gasket is located between the rear bearing (200) and the rear end cover (300), the gasket is made of rubber, and the gasket is used to reduce wear between the rear bearing (200) and the rear end cover (300).
9. The anti-rotation structure for the rotating shaft according to claim 1, characterized in that, The fastening end ring (400) is provided with a threaded hole (410) and an outer stop (420) on the side opposite to the rotor (100). The outer stop (420) is used to install a sensor (500). The sensor (500) is a ring structure, with its inner circumference sleeved on the outer circumference of the outer stop (420). The sensor (500) is provided with a screw hole (510) that mates with the threaded hole (410) to facilitate the fixed connection between the sensor (500) and the fastening end ring (400). The sensor (500) is used to detect the rotation angle of the rotor (100).
10. The anti-axial movement structure of the rotating shaft according to claim 3, characterized in that, A pressure sensor (500) is installed in the bearing housing (310). The pressure sensor (500) is located between the outer ring (220) of the bearing and the annular stop ring (330). The pressure sensor (500) is used to detect the axial force of the rear bearing (200).