US Patent 8001691 Method for manufacturing hydrodynamic bearing and shaft

A method for manufacturing a hydrodynamic bearing (30) comprises steps of: step (201): providing a substrate (10) with a plurality of protrusions (14) formed on a periphery thereof; step (202): placing the substrate in a middle of a hollow mold, then injecting a feedstock of powder and molten binder into the mold to surround the substrate under pressure, thus forming a desired bearing preform (20); step (203): separating the substrate from the bearing preform by means of catalytic debinding; step (204): separating the binder from the bearing preform; step (205): sintering the bearing preform; step (206): precision machining the bearing preform to form the desired hydrodynamic bearing.