Motor capable of preventing shaft runout
By combining thrust bearings and deep groove ball bearings, the problem of shaft axial movement was solved, achieving stable shaft operation and improved bearing durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU XINGYU ELECTRIC MASCH CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-14
AI Technical Summary
In existing technologies, shafts are prone to shifting under axial and radial forces, causing equipment to malfunction and damaging the bearings.
It adopts a combination structure of thrust bearing and deep groove ball bearing. The thrust bearing is used for axial support, and the deep groove ball bearing is used for radial support. Combined with the design of disc spring and stop, it prevents shaft movement and disperses axial force.
Effectively prevents shaft movement, reduces bearing wear, and extends bearing life. Thrust bearings and deep groove ball bearings complement each other, reducing the risk of wear.
Smart Images
Figure CN224503057U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an electric motor. Background Technology
[0002] When a fan or water pump is connected to a motor shaft, the motor shaft is often subjected to axial and radial forces. Excessive axial movement during operation can lead to malfunctions and damage to the main unit or motor.
[0003] To prevent axial movement, the commonly used anti-movement structure consists of bearings at both ends of the shaft. The inner ring of the bearing is fixed to the shaft and in contact with the step of the shaft, while the outer ring of the bearing is clamped in the bearing chamber of the end cover by the bearing cover. This structure can prevent the shaft from moving, but the external axial force is borne by the bearing, which makes the bearing prone to wear and requires frequent replacement. Utility Model Content
[0004] To address the aforementioned problems, this invention presents a motor designed to prevent shaft slippage, which effectively prevents shaft slippage and reduces axial force damage to the bearings.
[0005] The technical solution of this utility model is an electric motor that can prevent shaft slippage, comprising a housing 5, end caps 4 connected to the left and right ends of the housing, bearing chambers 2 provided in the end caps, a stator 6 fixedly inserted on the inner wall of the housing, a rotor 7 inserted in the stator, and a rotor shaft 8 having a step, the diameter of the middle part being larger than the diameter of the left and right ends. The left and right ends of the shaft 8 are radially supported in the bearing chambers 2 by deep groove ball bearings 3. The feature is that thrust bearings 1 are respectively fitted on the left and right ends of the shaft 8, the inner side of the bearing chamber 2 presses against the thrust bearings 1, the thrust bearings are in contact with the outer side of the inner ring of the deep groove ball bearings, and the inner side of the inner ring of the deep groove ball bearings is in contact with the step of the shaft.
[0006] The beneficial effects of this utility model are:
[0007] 1. Thrust bearings are fitted at both ends of the shaft. The inner side of the bearing chamber on the end cover presses against the thrust bearing. The thrust bearing is in contact with the outer side of the inner ring of the deep groove ball bearing. The inner side of the inner ring of the deep groove ball bearing is in contact with the step of the shaft. The end cover is fixedly connected to the housing. When an external axial force is applied to the shaft, it can prevent the shaft from moving axially.
[0008] 2. The axial force is transferred to the housing through the steps of the shaft, the inner ring of the deep groove ball bearing, the thrust bearing, and the side wall of the bearing housing. The axial force is not applied to the steel balls and outer ring of the deep groove ball bearing, resulting in no axial friction and improving the service life of the bearing.
[0009] 3. Thrust bearings have good axial load performance, while deep groove ball bearings have good radial load performance. Their advantages complement each other, and neither thrust bearings nor deep groove ball bearings are easily damaged. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model.
[0011] Figure 2 for Figure 1 A magnified view of section C.
[0012] Attached diagram symbols: 1-Thrust bearing, 2-Bearing housing, 3-Deep groove ball bearing, 4-End cover, 5-Housing, 6-Stator, 7-Rotor, 8-Shaft, 9-Clearance, 10-Stop, 11-Disc spring. Detailed Implementation
[0013] An electric motor capable of preventing shaft slippage includes a housing 5, end caps 4 connected to the left and right ends of the housing, bearing chambers 2 respectively provided in the end caps, a stator 6 fixedly inserted into the inner wall of the housing, a rotor 7 inserted into the stator, and a rotor shaft 8 having a step, the diameter of the middle part being larger than the diameters of the left and right ends. The left and right ends of the shaft 8 are radially supported in the bearing chambers 2 by deep groove ball bearings 3 respectively. The characteristic is that thrust bearings 1 are respectively fitted on the left and right ends of the shaft 8, the inner side of the bearing chamber 2 presses against the thrust bearings 1, the thrust bearings are in contact with the outer side of the inner ring of the deep groove ball bearing (away from the step of the shaft), and the inner side of the inner ring of the deep groove ball bearing is in contact with the step of the shaft.
[0014] Among them, thrust bearings have good axial load performance and provide axial support for the shaft, while deep groove ball bearings have good radial load performance and provide radial support for the shaft.
[0015] With the above structure, a gap 9 can be left between the end face of one end of the housing and the end face of the corresponding end cover. This can not only reliably clamp the thrust bearing, but also appropriately reduce the axial fit accuracy of the housing, the middle of the shaft and the end cover, making it convenient for processing.
[0016] During motor operation, the temperature inside the casing rises, causing the shaft to expand axially. To compensate for this thermal expansion, a butterfly spring 11 is fitted onto one end of the shaft, positioned between the thrust bearing and the side wall of the bearing housing. To prevent radial movement of the butterfly spring, a stop 10 is provided on the side wall of the bearing housing, with the outer edge of the butterfly spring located within the stop. The butterfly spring can be a single spring or two arranged in opposite directions.
Claims
1. An electric motor capable of preventing shaft slippage, comprising a housing (5), end caps (4) connected to the left and right ends of the housing, bearing chambers (2) provided in the end caps, a stator (6) fixedly inserted into the inner wall of the housing, a rotor (7) inserted into the stator, the rotor shaft (8) having a step, the diameter of the middle part being larger than the diameters of the left and right ends, the left and right ends of the shaft (8) being radially supported in the bearing chambers (2) by deep groove ball bearings (3), characterized in that, Thrust bearings (1) are fitted on the left and right ends of the rotating shaft (8). The inner side of the bearing chamber (2) presses against the thrust bearings (1). The thrust bearings are in contact with the outer side of the inner ring of the deep groove ball bearing. The inner side of the inner ring of the deep groove ball bearing is in contact with the step of the rotating shaft.
2. The electric motor capable of preventing shaft slippage according to claim 1, characterized in that, A gap (9) is left between the end face of one end of the housing (5) and the end face of the corresponding end cover.
3. The electric motor capable of preventing shaft slippage according to claim 1 or 2, characterized in that, A butterfly spring (11) is fitted at one end of the shaft, and the butterfly spring is located between the thrust bearing and the inner wall of the bearing chamber.
4. The electric motor capable of preventing shaft slippage according to claim 3, characterized in that, A stop (10) is provided on the inner wall of the bearing chamber, and the outer edge of the butterfly spring is located in the stop.