OIL-RETAINING BEARING AND MOTOR WITH OIL-RETAINING BEARING

摘要

PROBLEM TO BE SOLVED: To prevent the generation of abnormal sound due to whirling of a rotating shaft in starting by providing a non-porous abutting part projecting on the inner peripheral surface near a boundary part of adjacent bearing parts in an oil-retaining bearing composed of a center bearing part with its inner peripheral surface parallel with the rotating shaft, and end bearing parts arranged at both ends of the center bearing part. ;SOLUTION: A rotor of a motor comprises a rotating shaft and an armature assembled almost perpendicularly. The rotating shaft with a driven body such as a fan fitted to the upper end part is rotatably supported in the vertical direction at both ends of the armature by an oil-retaining bearing composed of an upper end side oil- retaining bearing 3a and a lower end side oil-retaining bearing. In this case, the oil- retaining bearing (the upper end side oil-retaining bearing 3a in the figure) is composed of a center bearing part 31a, and one end bearing part 32a and the other end bearing part 33a arranged at both ends of the center bearing part 31a and gradually diameter- enlarged in the inner peripheral surfaces toward the end parts. A non-porous abutting part 38a projected in the inner diameter direction is further formed at a boundary part 34a between the center bearing part 31a and one end bearing part 32a.;COPYRIGHT: (C)2001,JPO