Patent ID: 7513688
Filing Date: 2009-04-07
Classification: F16C

Abstract:
1. A hydrodynamic bearing device comprising: a shaft; a sleeve for supporting a shaft, such that a gap exists between the sleeve and the shaft; a cover fixed to said sleeve, for covering an end surface of said sleeve, such that a space exists between the sleeve and the cover; dynamic pressure grooves on at least one surface of said shaft and said sleeve, such that an outer peripheral surface of the shaft is opposite an inner peripheral surface of the sleeve, said dynamic pressure grooves for supporting said shaft with respect to said sleeve, such that the shaft is rotatable; and a working fluid in spaces adjacent to the sleeve including a space between said cover and said sleeve, wherein at least a part of the cover is translucent, and the cover is shaped such that a fluid-filled space between the cover and the sleeve gradually becomes deeper along a circumferential direction.