Patent ID: 8360648
Filing Date: 2013-01-29
Classification: B22F,F16C,Y10T

Abstract:
1. An oil-impregnated sintered bearing comprising: a bearing body made of a sintered metal to support a rotating shaft by an inner surface thereof as a friction surface, said bearing body having a bearing hole therein; wherein the bearing hole includes a journal part that has a constant diameter, said journal part being configured to support the rotating shaft when the shaft is parallel to an axial direction of the bearing body, and at least one enlarged diameter part being provided on each end of the journal part in the axial direction of the bearing body such that at least one enlarged diameter part on each end of the journal part is connected by the journal part at a boundary between the journal part and the enlarged diameter part, said at least one enlarged diameter part connected by the journal part being configured to support the rotating shaft when the shaft inclines with respect to the axial direction of the bearing body, a sintered density of the enlarged diameter parts is larger than that of the journal part such that cavities exposed on an inner surface of the enlarged diameter parts are smaller in size and fewer in number than those of cavities exposed on an inner surface of the journal part, said sintered density changes at the boundary so that the enlarged diameter part has a substantially higher density than the journal part, the at least one enlarged diameter part that is directly connected with an end of the journal part is called a first part, and a line obliquely extending along an inclined surface of one of the first parts is arranged parallel to a line obliquely extending along an inclined surface of the other first part, and a distance between the lines is substantially equal to the diameter of the rotating shaft.