Patent ID: 8454239
Filing Date: 2013-06-04
Classification: F16C,Y10T

Abstract:
1. A fluid dynamic bearing device, comprising: a shaft member comprising: a sleeve portion in which the larger diameter portion of the shaft member is inserted along an inner periphery thereof; a seal portion which forms a seal space, between the seal portion and an outer peripheral surface of the smaller diameter portion of the shaft member, for preventing a lubricating fluid in an inside of the fluid dynamic bearing device from leaking to an outside, and which retains the shaft member by being engaged with the shoulder surface of the shaft member in an axial direction; a radial bearing portion for supporting the shaft member in a radial direction with a fluid film generated in a radial bearing gap between an outer peripheral surface of the larger diameter portion of the shaft member and an inner peripheral surface of the sleeve portion; and a thrust bearing portion for supporting the shaft member in a thrust direction, wherein a first axial gap is formed between the seal portion and the sleeve portion.