Patent ID: 8177433

Claim:
A hydrodynamic bearing unit comprising: a housing having a bottom; a bearing sleeve fixed to the inner periphery of the housing; a rotational member which rotates relative to the bearing sleeve and the housing; and a seal space for sealing in a lubricating fluid, wherein the rotational member is supported in a non-contact manner in radial and thrust directions by a hydrodynamic effect of the lubricating fluid occurring in a bearing gap, wherein the housing includes a thrust bearing face forming a thrust bearing gap between the housing and the rotational member, or a sealing surface forming the seal space between the housing and the rotational member, wherein the lubricating fluid is an ester-based lubricating oil, and the housing is formed from a liquid-crystalline polymer (LCP)-based resin material of wholly aromatic polyester, wherein the resin material includes a filler mixed therein, and the filler includes carbon fiber, and wherein the resin material contains at least 50 wt. % of the liquid-crystalline polymer (LCP) and 15-40 wt. % of the carbon fiber.