| 摘要 |
A hydrodynamic bearing-type pump, where a shaft can be radially supported in a rotatable manner, a pumping pressure for a fluid can be reliably produced by a hydrodynamic bearing, and the pump can be downsized. A hydrodynamic bearing-type pump includes a rotating portion (121) provided in a fluid flow passage for a fluid in a main body, for producing a dynamic pressure that causes the fluid to flow in from a flow inlet (11) and flow out from a flow outlet (12). The rotating portion (121) has a shaft (14), a hydrodynamic bearing (13) for producing a dynamic pressure that causes the fluid to flow in from the flow inlet and flow out from the flow outlet when the shaft is rotated, and a rotational force-producing portion (133) provided in the main body, for rotating the shaft when electricity is passed through the portion. The hydrodynamic bearing has a first dynamic pressure-producing groove (15) formed near the flow inlet and a second dynamic pressure-producing groove (16) formed near the flow outlet. A first dynamic pressure produced in the radial direction by the first dynamic pressure-producing groove is smaller than a second dynamic pressure produced in the radial direction by the second dynamic pressure-producing groove.
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