Patent attributes
A fluid bearing device for preventing a lubricant from scattering outside even during rotation thereof, while holding a relatively large amount of lubricant in a seal surface portion. Lubricant is filled between a sleeve and a shaft, the seal surface portion is formed in a location facing an open end of the sleeve, a sectional shape of the seal surface portion is such that a smallest clearance from an outer peripheral surface of the shaft is at a radial bearing portion side end portion of the seal surface portion, a largest clearance is at an intermediate portion between the radial bearing portion side end portion and an open end side end portion of the seal surface portion, and a clearance at the open end side end portion of the seal surface portion is smaller than the clearance at the intermediate portion.
