OIL RETAINING BEARING AND MOTOR WITH OIL RETAINING BEARING

摘要

PROBLEM TO BE SOLVED: To prevent the occurrence of whirling noise by forming a boundary section between a central bearing section having an inner periphery parallel with a rotary shaft and a one-end bearing section having an expanding inner periphery into a nonporous surface, forming a boundary section between the central bearing section and the other-end bearing section having an expanding inner periphery into a porous surface, and arranging the one-end bearing section on the shaft end section side.;SOLUTION: The lubricant of an upper end section side oil retaining bearing 3a drops via gravitational force through the gap between the tapered portion of a one-end bearing section 32a and a rotary shaft 2 and is flooded on the nonporous surface 36a (C). The lubricant in the oil retaining bearing 3a is absorbed from the surface of the central bearing section 3a and fed (D). The lubricant of a lower end section side oil retaining bearing 3b is held by a capillary phenomenon in the gap between the tapered portion of the other-end bearing section 32b and the rotary shaft 2. The lubricant dropping from the nonporous surface 36b of the other-end bearing section 32b is absorbed into an oil retaining bearing 3b and is fed to the sliding face of the rotary shaft 2 via the surfaces of the central bearing section and the other-end bearing section 32b (F), and it drops on the inner periphery of a nonporous surface 34b and is fed (G). An uncomfortable sound can be prevented when the rotary shaft 2 is inclined.;COPYRIGHT: (C)2000,JPO