Patent ID: 7285886

Claim:
A motor comprising: a rotor including a hub portion, a shaft portion mounted at the center of the hub and a thrust ring attached on the inner circumferential surface of the hub portion; a stator including a sleeve with an insertion hole into which the shaft portion is inserted and a flange portion extending radially outward at a first end of the insertion hole; and a lubrication fluid filled portion filled with lubrication fluid to be used to rotatably support the rotor with respect to the stator wherein the lubrication fluid filled portion includes: a thrust dynamic pressure bearing portion; a radial dynamic pressure bearing portion; and a pump-in dynamic pressure generation portion disposed between the thrust dynamic pressure bearing portion and the radial dynamic pressure bearing portion located in a position where the inner circumferential surface of the hub is opposed to the outer circumferential surface of the flange portion so as to generate pressure that causes the lubrication fluid to move toward the radial dynamic pressure bearing portion.