Pivot bearing unit for hard disk actuator

Patent metadata

Field	Value
Publication number	US-8995093-B2
Application number	US-201213982930-A
Country	US
Kind code	B2
Filing date	Jun 27, 2012
Priority date	Jul 27, 2011
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

In an HDD actuator pivot bearing unit 10 , an axial inner surface 22 a of a shield cap 22 is formed into a stepped shape so that an axial minimum gap a 1 with a shield member 14 e of one bearing 14 is narrower than an axial minimum gap a 2 with an outer ring 14 b and so that an axial minimum gap a 3 with a boundary position 14 b 3 between an axial end face of the outer ring 14 and an annular groove 14 b 1 is narrower than the axial minimum gap a 2 with the outer ring 14 . By doing so, the amount of air passing through an interior of the bearing can be reduced to thereby reduce outparticles.

First claim

The invention claimed is:

1. A pivot bearing unit for a hard disk actuator comprising:
a shaft member having a flange portion at an axial end portion;
a pair of bearings each including an inner ring, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, a cage which holds individually the plurality of rolling elements, and a shield member which is mounted in an annular groove formed in an axial end portion of the outer ring and whic…

Assignees

• Nanasawa Toru
• Horiuchi Naoto
• Nsk Ltd

Inventors

• Nanasawa Toru
• Horiuchi Naoto

Classifications

• G11B5/5569 Primary

  Physics · mapped topic

• F16C33/805

  Mechanical Engineering · mapped topic

• F16C2370/12

  Mechanical Engineering · mapped topic

• G11B25/043

  Physics · mapped topic

• F16C19/54

  Mechanical Engineering · mapped topic