Patent ID: 7527431

Claim:
A bearing unit, comprising: a radial bearing and a thrust bearing extending along an axis of rotation and configured to support a shaft for rotation; a path forming member and a path forming member lid configured to form a communicating path having a function of short-circuiting pressure generated when said shaft and said radial bearing rotate relative to each other, the path forming member having a cup-shaped configuration defining a recess extending partially thereinto along the axis of rotation and sized to completely receive the radial bearing and the thrust bearing therein and to completely receive the path forming member lid, the path forming member lid operative in conjunction with the path forming member to retain the radial bearing and the thrust bearing in the path forming member, the path forming member completely surrounding the radial bearing, the thrust bearing and the path forming member lid along and about the axis of rotation; a housing enveloping the path forming member and the path forming member lid while said housing is open at one end of said shaft with a small void left therebetween; and lubricating oil filled in said void; wherein said path forming member and said path forming member lid cooperate with each other to fully cover said radial bearing except a shaft opening side portion of said radial bearing, and said housing being made of a molded resin material.