Patent ID: 6979128
Filing Date: 2005-12-27
Classification: F16C,G11B,H02K

Abstract:
1. A spindle motor, with a shaft, for a hard disc drive, comprising: a base; a thrust plate mounted on the base forming bearing clearances with respect to the shaft, and supporting the shaft in a thrust direction; a sleeve accommodating the shaft, forming bearing clearances between an inner circumferential surface of the sleeve and an outer circumferential surface of the shaft, and supporting the shaft in a radial direction when the shaft is rotated; a starter core mounted at an outer side of the sleeve; a hub, to which the shaft is fixed, having an assembly of a yoke and a magnet at a position corresponding to the starter core producing electromagnetic forces through interactions with the starter core; an oil inlet at one side of the sleeve through an outer circumferential surface to the inner circumferential surface of the sleeve, and through which oil is provided into the bearing clearances; and an oil outflow prevention unit installed at an inner side of the oil inlet preventing the oil from flowing out through the oil inlet, but allowing an outflow of air bubbles generated due to gasification of the oil, while the shaft is rotated.