| 摘要 |
It is an object of the present invention to provide a hydrodynamic pressure bearing type pump in which a shaft can freely rotate in the radial direction and in which a hydrodynamic pressure bearing can reliably generate fluid pumping pressure, the hydrodynamic pressure bearing type pump being miniaturized. To this end, the hydrodynamic pressure bearing type pump comprises a rotating portion 121 located in a fluid flow passage within a main body for generating hydrodynamic pressure to let fluid flow into a fluid flow inlet 11 and to let fluid flow from a fluid flow outlet 12 to the outside, the rotating portion 121 including a shaft 14, a hydrodynamic pressure bearing 13 for generating hydrodynamic pressure to let fluid flow into the fluid flow inlet and to let fluid flow from the fluid flow outlet to the outside when the shaft is rotated and a rotation force generating portion 133 disposed within the main body and rotating the shaft when it is energized. The hydrodynamic pressure bearing includes a first hydrodynamic pressure generating groove formed at the position near the fluid flow inlet and a second hydrodynamic pressure generating groove formed at the position near the fluid flow outlet, and first hydrodynamic pressure generated from the first hydrodynamic pressure generating groove with respect to the radial direction is smaller than second hydrodynamic pressure generated from the second hydrodynamic pressure generating groove with respect to the radial direction.
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