Patent ID: 7473034
Filing Date: 2009-01-06
Classification: F16C,H02K

Abstract:
1. A hydrodynamic bearing device, comprising: a stationary shaft; a thrust flange that is larger in diameter than the stationary shaft and is provided near one end of the stationary shaft; a sleeve attached so as to be rotatable with respect to the stationary shaft and the thrust flange, the sleeve having an inner peripheral face opposite an outer peripheral face of the stationary shaft in a radial direction with a first gap therebetween, and a first axial direction face opposite a face of the thrust flange in an axial direction with a second gap therebetween; a sealing plate provided so as to be capable of rotating integrally with the sleeve, the sealing plate provided opposite a second axial direction face of the sleeve in the axial direction with a third gap therebetween, the second axial direction face of the sleeve being located on an opposite side of the sleeve from the first axial direction face of the sleeve; a radial dynamic thrust bearing formed in the first gap; and a thrust dynamic bearing formed in the second gap, wherein at least one communicating passage is provided for communicating between the second gap and the third gap, the first gap, the second gap, the third gap, and the communicating passage hold a lubricating fluid, and the radial dynamic bearing and/or the thrust dynamic bearing is formed such that the lubricating fluid in the third gap circulates from an inner peripheral side of the sleeve toward an outer peripheral side of the sleeve.