Abstract: A hydrodynamic bearing device 4 comprises a shaft 41, a second thrust flange 41c, a sleeve 42, a radial bearing 71, and a thrust bearing 73. The second thrust flange 41c is fixed near one end of the shaft 41. A third cylindrical protrusion 42e that protrudes farther in the axial direction than the second thrust flange is fixed to or integrally machined at one end of the sleeve 42. A notch 50 that communicates between a radial inner space and a radial outer space separated by the third cylindrical protrusion 42e is provided to the third cylindrical protrusion 42e.

Abstract: A hydrodynamic bearing device which can improve workability of injecting a lube repellant and effectively prevent leakage of a lubricant, a method for manufacturing the same, a spindle motor, and a recording and reproduction apparatus are provided. A hydrodynamic bearing device 4 includes a lube repellant 11a which is applied in a circular shape by a predetermined distance in a radial direction from a portion of an upper surface of a second thrust flange 41c where it is connected to a shaft 41 and a lube repellant 11b which is applied in a circular shape on an outer peripheral surface of the second thrust flange 41c below from an upper end in the radial direction by a predetermined distance. The lube repellant 11b is applied near the upper end portion in a gap formed between the outer peripheral surface of the second thrust flange 41c and an inner peripheral surface of an outer sleeve 44.

Abstract: A hydrodynamic bearing device which can improve workability of injecting a lube repellant and effectively prevent leakage of a lubricant, a method for manufacturing the same, a spindle motor, and a recording and reproduction apparatus are provided. A hydrodynamic bearing device 4 includes a lube repellant 11a which is applied in a circular shape by a predetermined distance in a radial direction from a portion of an upper surface of a second thrust flange 41c where it is connected to a shaft 41 and a lube repellant 11b which is applied in a circular shape on an outer peripheral surface of the second thrust flange 41c below from an upper end in the radial direction by a predetermined distance. The lube repellant 11b is applied near the upper end portion in a gap formed between the outer peripheral surface of the second thrust flange 41c and an inner peripheral surface of an outer sleeve 44.

Abstract: Object: To prevent the lubricant that fills a bearing from leaking out, and prevent air bubbles from infiltrating the bearing, even if the open end of a bearing should be blocked off by a finger or the like in the course of assembling a hydrodynamic bearing device, etc. Means for Solution: A hydrodynamic bearing device 4 comprises a shaft 41, a second thrust flange 41c, a sleeve 42, a radial bearing 71, and a thrust bearing 73. The second thrust flange 41c is fixed near one end of the shaft 41. A third cylindrical protrusion 42e that protrudes farther in the axial direction than the second thrust flange is fixed to or integrally machined at one end of the sleeve 42. A notch 50 that communicates between a radial inner space and a radial outer space separated by the third cylindrical protrusion 42e is provided to the third cylindrical protrusion 42e.