To provide a miniaturizable dynamic-pressure bearing type pump for rotating a shaft in a radial direction freely, reliably generating a pumping pressure in fluid by a dynamic pressure bearing.
The dynamic-pressure bearing type pump has a rotary section 121 arranged in a fluid passage of fluid in a body, allows fluid to flow in from an inflow opening 11, and generates dynamic pressure flowing out of an outflow opening 12. The rotary section 121 comprises a shaft 14; a dynamic pressure bearing 13 for generating dynamic pressure for allowing fluid to flow in from the inflow opening when the shaft is rotated for flowing out of the outflow opening; and a rotary force generation section 133 arranged in the body for rotating the shaft by energization. The dynamic-pressure bearing comprises a first dynamic-pressure occurrence groove 15 formed close to the side of the inflow opening; and a second dynamic-pressure occurrence groove 16 formed close to the side of the outflow opening. The first dynamic pressure generated by the first dynamic-pressure occurrence groove in relation to the radial direction is smaller than the second dynamic pressure generated by the second dynamic-pressure occurrence groove in relation to the radial direction.
Hironobu Isoyama
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