Assembly structure for releasing clearance between shaft and bearing
By setting the groove structure at the mating point between the bearing and the rotating shaft, the problem of deformation and frictional force of the inner wheel of the bearing caused by the interference mating is solved, the release of the play and the reduction of friction are achieved, and the rotation efficiency of the bearing is improved and energy utilization efficiency.
Patent Information
- Application Number
- CN202421049990.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-15
AI Technical Summary
In the prior art, the interference fit between the bearing and the rotating shaft causes deformation of the inner wheel of the bearing, resulting in a decrease in clearance or a negative clearance, increasing friction and causing energy waste.
A groove structure is provided at the mating of the rotating shaft or bearing inner wheel to alleviate deformation caused by interference mating, release clearance and reduce friction.
By setting the groove structure, it can effectively alleviate the deformation of the inner wheel of the bearing, maintain the clearance gap, reduce friction, improve the rotation efficiency of the bearing and reduce energy consumption.
Smart Images
Figure CN222315711U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steering systems, in particular to an assembly structure for releasing the clearance between a shaft and a bearing. Background Art
[0002] With the development of intelligent automobiles, especially electric vehicles, consumers have higher and higher standards for automobile noise. And the degree of demand is also getting higher and higher, and the demand for silence has become the mainstream. Generally, the sound is often generated by the movement and rotation of parts, and such movement and rotation often cannot be separated from the use of bearings. In order to improve the competitiveness of products, under the premise of the current industrial level, it can be improved by reducing the bearing clearance, but due to the limitations of processing level and process assembly capabilities, as well as the necessary interference fit requirements of the rotating shaft and bearing. Blindly improving the accuracy of components will not meet the actual production. Smaller bearing clearance or negative clearance will significantly increase friction. The increase in friction will make the bearing more susceptible to wear, and will also cause unnecessary energy waste due to higher friction. Summary of the invention
[0003] In order to overcome the deficiencies of the prior art, the utility model provides an assembly structure for releasing the clearance between a shaft and a bearing, wherein a groove is dug at the rotating shaft or the inner wheel of the bearing where it cooperates with the inner wheel of the bearing to release the bearing clearance, thereby reducing the excessive friction caused by the excessive movement clearance of the bearing due to the interference fit of the balls inside the bearing and the negative clearance.
[0004] To achieve the above-mentioned purpose, an assembly structure for releasing the clearance between a shaft and a bearing is designed, comprising a bearing and a rotating shaft, a bearing sleeve being arranged on the rotating shaft, and an interference fit being formed between the rotating shaft and the bearing, characterized in that a groove structure is provided at the fitting connection between the bearing and the rotating shaft; the groove structure is arranged on the outer circumferential surface of the rotating shaft or on the outer circumferential surface of the inner wheel of the bearing.
[0005] The groove structure is an annular groove or a vertical groove.
[0006] The groove structure is approximately in the shape of an arc.
[0007] A rotating shaft annular groove is arranged on the outer circumferential surface of the rotating shaft.
[0008] A plurality of rotating shaft vertical grooves are evenly distributed on the outer circumferential surface of the rotating shaft.
[0009] A bearing annular groove is provided on the outer circumferential surface of the inner wheel of the bearing.
[0010] A plurality of vertical bearing grooves are arranged on the outer circumferential surface of the inner wheel of the bearing.
[0011] Compared with the prior art, the utility model provides an assembly structure for releasing the clearance between the shaft and the bearing, and adopts a method of digging grooves on the rotating shaft or the inner wheel of the bearing at the position where the inner wheel of the bearing cooperates, so as to alleviate the deformation of the inner wheel of the bearing caused by the interference fit, and alleviate the friction caused by the further compression of the bearing clearance by the deformation of the inner wheel. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the shaft and bearing assembly.
[0013] Figure 2 It is a schematic cross-sectional view of the connection between the rotating shaft and the bearing in the prior art.
[0014] Figure 3 A schematic diagram of setting an annular groove on a rotating shaft.
[0015] Figure 4 This is a schematic diagram of providing a plurality of vertical grooves on a rotating shaft.
[0016] Figure 5 A schematic diagram of providing an annular groove on a bearing.
[0017] Figure 6 This is a schematic diagram of providing multiple vertical grooves on a bearing. DETAILED DESCRIPTION
[0018] The utility model is further described below with reference to the accompanying drawings.
[0019] The inner wheel of the bearing and the shaft are interference fit, the purpose of which is to fix the inner wheel of the bearing on the shaft to realize the rotation function (the interference force design of the bearing and the shaft is related to the actual working conditions and requirements). When the inner wheel of the bearing and the shaft are interference fit, it will cause the inner wheel of the bearing to expand and deform. This deformation will squeeze the inner wheel of the bearing, further reducing the internal clearance of the bearing, or even causing negative clearance. The bearing balls will be subjected to greater squeezing force, and the friction force of the bearing rotation will increase proportionally. Slotting the shaft or the inner wheel of the bearing can not only ensure the necessary interference force between the bearing and the shaft, but also the structure of the groove can alleviate the deformation of the inner wheel of the bearing caused by the interference fit, so that the internal clearance of the bearing is alleviated, thereby ensuring that the bearing is closer to the clearance clearance of the original required state, thereby reducing friction.
[0020] like Figure 1 , Figure 2 As shown, it is a schematic diagram and a plan view of the assembly structure of the bearing 1 and the rotating shaft 2 in the prior art. Figure 2It can be seen that when the inner wheel of bearing 1 and shaft 2 are interference fit, the inner wheel of bearing 1 is squeezed and deformed by shaft 2, and this deformation will further squeeze the internal clearance of bearing 1. As a result, the actual clearance of bearing 1 is smaller than the clearance in the original free state, and even a negative clearance state will occur. In this state, the balls of bearing 1 and the inner and outer wheels of bearing 1 will produce additional friction due to squeezing, so the actual output friction will increase significantly.
[0021] The bearing 1 is sleeved on the rotating shaft 2, and the rotating shaft 2 and the bearing 1 are interference fit, and a groove structure is provided at the fitting connection between the bearing 1 and the rotating shaft 2; the groove structure is provided on the outer circumferential surface of the rotating shaft 2 or on the outer circumferential surface of the inner wheel of the bearing 1.
[0022] The groove structure is an annular groove or a vertical groove.
[0023] The groove structure is a groove structure that is approximately in the shape of an arc.
[0024] A groove is added at the interference fit between the bearing 1 and the rotating shaft 2 to release the extrusion force of the interference fit.
[0025] Only one annular circular groove is required, but multiple vertical grooves are required, and the number of vertical grooves is related to the number of balls in the bearing.
[0026] A shaft annular groove 3 is provided on the outer circumferential surface of the shaft 2 .
[0027] A plurality of vertical shaft grooves 4 are evenly distributed on the outer circumferential surface of the shaft 2 .
[0028] A bearing annular groove 5 is provided on the outer circumferential surface of the inner wheel of the bearing 1 .
[0029] A plurality of vertical bearing grooves 6 are provided on the outer circumferential surface of the inner wheel of the bearing 1 .
[0030] The size and number of slots can be designed by CAE structural analysis to determine the optimal slot width and slot position.
[0031] The utility model is an effective optimization scheme for improving the phenomenon that the circumferential deformation of the inner wheel of the bearing is caused when the bearing is matched with the rotating shaft, resulting in a reduction in the actual clearance of the bearing and an increase in the friction force.
Claims
1. An assembly structure for releasing the clearance between a shaft and a bearing, comprising a bearing and a rotating shaft, wherein the bearing (1) is sleeved on the rotating shaft (2), and the rotating shaft (2) and the bearing (1) are in an interference fit, characterized in that: A groove structure is provided at the matching connection between the bearing (1) and the rotating shaft (2); the groove structure is provided on the outer circumferential surface of the rotating shaft (2) or on the outer circumferential surface of the inner wheel of the bearing (1).
2. The assembly structure for releasing the clearance between the shaft and the bearing according to claim 1, characterized in that: The groove structure is an annular groove or a vertical groove.
3. An assembly structure for releasing the clearance between a shaft and a bearing according to claim 1 or 2, characterized in that: The groove structure is approximately in the shape of an arc.
4. The assembly structure for releasing the clearance between a shaft and a bearing according to claim 1, characterized in that: A rotating shaft annular groove (3) is provided on the outer circumferential surface of the rotating shaft (2).
5. The assembly structure for releasing the clearance between a shaft and a bearing according to claim 1, characterized in that: A plurality of rotating shaft vertical grooves (4) are evenly distributed on the outer circumferential surface of the rotating shaft (2).
6. The assembly structure for releasing the clearance between a shaft and a bearing according to claim 1, characterized in that: A bearing annular groove (5) is provided on the outer circumferential surface of the inner wheel of the bearing (1).
7. The assembly structure for releasing the clearance between a shaft and a bearing according to claim 1, characterized in that: A plurality of vertical bearing grooves (6) are provided on the outer circumferential surface of the inner wheel of the bearing (1).