A hydraulic bearing that supports a rotating shaft comprises a bearing metal.
On
a surface of the bearing metal, a hydrostatic pocket and a land portion are formed.
The land portion is defined by the hydrostatic pocket and generates hydrodynamic
pressure in response to a rotation of the rotating shaft. The hydraulic bearing
further comprises a pressure fluid supplying source and an oil-supplying hole.
The oil-supplying hole is opened in the hydrostatic pocket and provides pressure
fluid from the pressure fluid supplying source to the hydrostatic pocket. On the
land portion, a drain hole that drains the fluid is formed. On the way of a drain
passage, a check valve is disposed. Since the drain hole does not separate the
land portion, deterioration of bearing rigidity is restrained. Further, since the
fluid is drained through the drain hole, thermal expansion of the bearing metal
due to heat generation of the fluid is restrained. Moreover, according to the check
valve, it is possible to prevent suctioning air into the hydraulic bearing when
negative pressure generates at the land portion.