Hydraulic bearing device

A radial hydraulic bearing device that supports an outer surface of a rotating shaft comprising:

• a cylindrical bearing metal;
• a plural number of hydrostatic pockets formed on an inner circumferential surface of the bearing metal;
• a land portion formed on the inner circumferential surface of the bearing metal and defined by the hydrostatic pockets, which generates hydrodynamic pressure;
• a pressure fluid supplying source;
• an oil-supplying hole opened in each of the hydrostatic pockets and providing pressure fluid from the pressure fluid supplying source to each of the hydrostatic pockets;
• a drain hole formed on each land portion between each of the hydrostatic pockets and draining the fluid;
• and
• a variable valve connecting with the drain hole.

A thrust hydraulic bearing device that supports a surface perpendicular to rotational axis of a rotating shaft comprising:

• a ring-shaped bearing metal;
• a plural number of hydrostatic pockets formed on an end surface of the bearing metal;
• a land portion formed on the end surface of the bearing metal and defined by each of the hydrostatic pockets, which generates hydrodynamic pressure;
• a pressure fluid supplying source;
• an oil-supplying hole opened in each of the hydrostatic pockets and providing pressure fluid from the pressure fluid supplying source to each of the hydrostatic pockets;
• a drain hole formed on the land portion between each of the hydrostatic pockets and draining the fluid;
• and
• a variable valve connecting with the drain hole.