Patent ID: 7029179

Claim:
A bearing unit comprising: a shaft consisting of a body having a circular section and a disc-shaped radial projection formed on one end of the shaft body and having a larger diameter than the shaft body; a radial bearing to support the shaft circumferentially of the latter; a thrust bearing disposed opposite to the radial projection of the shaft to support the shaft at one of thrusting-directional ends of the latter; a housing having disposed therein the radial and thrust bearings which support together the shaft, filled with a viscous fluid, and having a closed structure except for a shaft insertion hole through which the shaft is introduced; and a spacer member disposed in the housing to keep a gap between the end face of the radial bearing and one side of the radial projection of the shaft; there being formed on either one side of the radial projection opposite to the end face of the radial bearing or the end face of the radial bearing opposite to the one side of the radial projection a dynamic pressure producing means for producing a dynamic pressure by the viscous fluid; and there being formed on either the side of the thrust bearing opposite to the other side of the radial projection or the other side of the radial projection a dynamic pressure producing means for producing a dynamic pressure by the viscous fluid.