Interference magnitude simulation fixture for bearing installation

Abstract

The invention relates to an interference magnitude simulation fixture for bearing installation. The interference magnitude simulation fixture comprises an expanding shaft type fixture which enables an inner ring of a test bearing to be pressed to deform and an expanding sleeve type fixture which enables an outer ring of the test bearing to be pressed to deform, and the test bearing is arranged between the expanding shaft type fixture and the expanding sleeve type fixture; the outer ring and the inner ring of the test bearing are respectively pressed by using the expanding sleeve type fixture and the expanding shaft type fixture, when an elastic expanding sleeve and an elastic core shaft have elastic deformation at the surface, and the inner ring and the outer ring of the bearing are stressed and change along with the deformation, so that actual operating conditions of bearing assembly are simulated, the operating performance of the bearing under different interference conditions is analyzed through testing operating parameters of the bearing under the simulated working conditions, a bearing with the friction moment and the clearance being appropriate after installation is selected under the premise of given magnitude of interference, and thus problems of bearing installation at present are solved.

Description

technical field [0001] The invention relates to the technical field of bearing assembly, in particular to an interference simulation fixture for bearing installation. Background technique [0002] The interference connection method is usually used between the bearing and the shaft, the bearing and the seat hole. The interference connection has the characteristics of good centering and simple structure. Most of the bearings on the aircraft are assembled using the interference connection method; when installing the bearing, due to The manufacturing accuracy, clearance, and no-load friction torque of batch bearings are different, and the clearance and friction torque after bearing installation are easy to change. How to control the friction torque and clearance after bearing installation has always been a difficult problem in bearing installation . [0003] At present, the main problem of bearing installation is that due to the interference connection, the inner and outer ring...

AI Technical Summary

Problems solved by technology

[0003] At present, the main problem of bearing installation is that due to the interference connection, the inner and outer rings of the bearing are deformed under pressure, and the clearance becomes smaller, which directly affects the matching relationship between the inner and outer rings of the bearing and the rolling elements, thereby affecting the working characteristics of the bearing; due to the shape of the inner and outer rings of the bearing Changes, on the one hand, the size of the gap changes, on the other hand, the gap between the inner and outer rings is unevenly distributed along the axial direction; when the bearing clearance itself is relatively large, the slight change in the clearance after press-fitting does not affect its normal use , and when the clearance of the bearing itself is small, the change of the clearance after press-fitting may cause the friction torque of the bearing to increase, which may easily cause the rotation of the inner and outer rings of the bearing to be inflexible, and the deformation of the inner and outer rings of the bearing may even cause geometric interference between the inner and outer rings of the bearing. , stuck; especially for bearings such as self-lubricating joint bearings, usually the clearance of the bearing itself is very small. After the bearing is pressed, the bearing clearance changes due to the deformation of the inner and outer rings of the bearing. Two problems are more common: one is the bearing press The increase of the rear friction torque affects the mechanical properties of the entire shafting structure. Second, the clearance becomes smaller, and the self-lubricating lining layer may undergo plastic deformation or even rupture and fail due to excessive pressure.

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