Hydrodynamic bearing with porous bushes

摘要

Two porous, oil-impregnated bearing bushes 1 each having a bearing surface 17 are force-fitted into a housing 7 which is open at one end and closed at the other. A rotary shaft 2 is inserted in the bushes. The inner peripheral surfaces of the bushes and an oil led preventing member 11 are formed with a plurality of inclined grooves (hydrodynamic-pressure-generating grooves 5 and air current producing grooves 12). A solid lubricating composition 3 composed of synthetic resin as a base material ad oil as a lubricating component by blending lubricating oil or lubricating grease is disposed between the bushes. The area of the openings of the pores in each bearing surface is preferably set at 2-20% to facilitate circulation of oil between the bush and the bearing clearance.