High reliability and long life gas dynamic pressure bearing

Abstract

The invention relates to a high-reliability and long-life gas dynamic pressure bearing. A magnetic ring on the end face of the shaft sleeve is bonded to the end face of the shaft sleeve. The inner magnetic ring is bonded to the outer surface of the shaft, and the thrust plate is matched with the shaft shoulder and fastened by screws; the magnetic ring on the end face of the shaft sleeve, the magnetic ring of the thrust plate, the outer magnetic ring and the inner magnetic ring are all made of the same permanent magnet. The magnetic ring of the thrust plate and the magnetic ring on the end face of the shaft sleeve are magnetized axially and the mating surfaces are of the same polarity; the outer magnetic ring and the inner magnetic ring are magnetized radially and the mating surfaces are of the same polarity. The magnetic rings of the present invention are arranged symmetrically, and the shaft, bushing and thrust plate will generate large radial force and axial force under the action of the four sets of magnetic rings, and the bushing will reach a balance under the action of these forces The location overcomes the problem of friction and wear of the gas dynamic pressure bearing during the start and stop of the motor in various placement methods. In addition, the bearing can also reduce the angular compliance and improve the bearing capacity and stability of the bearing.

Description

technical field [0001] The invention relates to the technical field of gas dynamic pressure bearings, in particular to a gas dynamic pressure bearing with high reliability and long life. Background technique [0002] Bearings are the core components of gyro motors, and the accuracy and life of gyro motors depend on the high-speed rotating bearings. In aerospace and some military applications, there are some applications where the motor axis is parallel to the direction of gravity or inclined at a certain angle when the gyro motor starts and works, which puts forward higher requirements for the gyro motor, especially the bearing shaft of the gyro motor. The bearing capacity should be high, the wear should be small, and the stability should be strong. [0003] At present, the high-speed bearings used in gyro motors are mainly gas dynamic pressure bearings. The advantages of this bearing are as follows: ⑴. Compact structure, no auxiliary equipment required; ⑵. Stable support a...

AI Technical Summary

Problems solved by technology

These advantages are very suitable for gyro motors, but gas dynamic pressure bearings also have defects, as follows: ⑴. Gas dynamic pressure bearings have a small bearing capacity when the speed is low, especially when the motor starts and stops, dry friction will occur. Friction will destroy the bearing surface precision, bring pollutants, affect its performance and life, and reduce reliability; in response to this problem, various measures have been taken, such as: coating the bearing surface, using more wear-resistant materials, etc. These measures Only passively weakening the influence of dry friction does not solve the problem fundamentally; (2) The angular compliance of the gas dynamic pressure bearing is relatively high, especially when the motor is started at an inclined position or the axial direction of the motor is constantly changing during operation, the bearing surface may appear damage, resulting in bearing failure

However, there are also defects in this bearing structure: ⑴. The hemispherical structure is relatively complex and the processing cost is high; ⑵. Due to the hemispherical structure, the gap between the giant magnetic ring of the outer ring and the trapezoidal magnetic ring of the inner ring of the permanent magnetic bearing is relatively large. The support force will be greatly reduced with the increase of the gap; ⑶. For applications where the axial direction is parallel to the direction of gravity or inclined at a certain angle, the reason for the structure set by the permanent magnetic bearing cannot provide axial repulsion. During the start and stop process In this case, complete non-contact cannot be achieved, which also causes the problem of friction and wear of the bearing.

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