A passive magnetic fluid double suspension dynamic pressure bearing

Abstract

A passive magnetic liquid double suspension dynamic pressure bearing comprises a stepped shaft, a first small end cover, a second small end cover, a first big end cover, a second big end cover, a shaft sleeve, a permanent magnet ring, a first framework seal, a second framework seal, a first O-shaped ring, a second O-shaped ring and a clamping sleeve. The stepped shaft is provided with a first journal, a second journal, a third journal, a fourth journal and a fifth journal. The shaft sleeve is a rotary body. An oil inlet hole, an oil inlet hole oil chamber, an oil outlet hole and an oil outlethole oil chamber are evenly machined in the rotary body in the circumferential direction. The effect that the two oil holes are distributed left and right is ensured during assembling. The shaft sleeve is radially magnetized, the inner side is the N pole, and the outer side is the S pole. The third journal of the stepped shaft is sleeved with the permanent magnet ring. The permanent magnet ring outside the stepped shaft is sleeved with the shaft sleeve. A 0.4-mm gap is formed between the permanent magnet ring and the shaft sleeve. The permanent magnet ring is radially magnetized, the outer side is the N pole, and the inner side is the S pole. The magnetic poles of the permanent magnet ring are opposite to those of the radially magnetized shaft sleeve, repulsive force is formed, and the support function on the stepped shaft is achieved. The passive magnetic liquid double suspension dynamic pressure bearing simultaneously has a magnetic support system and a liquid dynamic pressure support system.

Description

technical field [0001] The invention relates to the design field of sliding bearings, in particular to a passive magnetic fluid double suspension dynamic pressure bearing. Background technique [0002] The condition for the hydrodynamic bearing to work normally is that the shaft must have sufficient rotational speed. When the rotational speed of the shaft is low, the carrying capacity of the ordinary hydrodynamic bearing will be greatly reduced, and it cannot effectively support the shaft. Contents of the invention [0003] According to the above-mentioned problems in the prior art, the present invention provides a passive magnetic-fluid double-suspension dynamic pressure bearing. The present invention adds a magnetic force support system on the basis of common hydrodynamic pressure bearings, and can improve the carrying capacity and static stiffness of the hydrodynamic pressure bearings. The bearing can work normally even when the rotating speed of the shaft is low, whic...

AI Technical Summary

Problems solved by technology

[0002] The condition for the hydrodynamic bearing to work normally is that the shaft must have sufficient speed. When the shaft speed is low, the bearing capacity of the ordinary hydrodynamic bearing will be greatly reduced, and it cannot effectively support the shaft.

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