Pivot assembly bearing and disk drive device

Abstract

A pivot assembly bearing includes: a sleeve, a shaft inserted into the sleeve, a pair of rolling bearings disposed between the sleeve and the shaft such that the rolling bearings are separated apart from each other in an axial direction. The rolling bearings include an inner ring fixed to the shaft, an outer ring fixed to the sleeve, and a rolling element provided between the inner ring and the outer ring; and a first sealing member which applies a pre-tension on the inner ring to the axial inside at the end of the axial side, thereby making the end surface of the inner ring is arranged at a position which is closer to the axial inside than the end surface of the outer ring. At the end of the side, the first sealing member abuts against the end surface of the outer ring. A first labyrinth gap between the first sealing member and an end face of the inner ring facing the outer side in the axial direction, and a second labyrinth gap between the first sealing member and the shaft are formed.

Description

[0001] This application enjoys the priority of Japanese Patent Application No. 2014-228573 filed on November 11, 2014 and Japanese Patent Application No. 2015-141288 filed on July 15, 2015, and the entire content of the Japanese Patent Application is cited in this application . technical field [0002] The present invention relates to a pivot assembly bearing for a disk drive and the like, and more particularly to a sealing structure based on a sealing gap. Background technique [0003] The pivot mounting bearing generally has a structure in which a sleeve is rotatably supported on the outer periphery of the shaft via a rolling bearing, and a pair of rolling bearings are provided in a state separated in the axial direction. In such pivot mounted bearings, in recent years, there has been a strong demand for improvement of dust caused by leakage, evaporation, and the like of oil contained in a lubricant filled inside. If dust adheres to the medium or the magnetic head, read a...

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned dust countermeasures, in the former case, even if it is a labyrinth, there are tiny gaps, so it is impossible to completely suppress the dust generated by the airflow passing through the gaps, etc.

In addition, in the latter magnetic fluid seal, since the gap is filled with magnetic fluid, there is no gap for air to flow, but there are problems that the cost of the magnetic fluid seal is high and special steps are required for assembly.

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