Sintered oil-impregnated bearing, and method for manufacturing a sintered oil-impregnated bearing

Abstract

Reduces frictional resistance with the rotating shaft. [Solution] The sintered oil-impregnated bearing 1 has a bearing hole h that rotatably supports a rotating shaft. In particular, the inner circumferential surface of the bearing hole h is provided with a plurality of bearing surfaces s partitioned by grid-like grooves g arranged in a grid pattern. As a result, the portion of the inner circumferential surface of the bearing hole h where the grid-like grooves g are provided does not come into contact with the rotating shaft, thus reducing the sliding area (area of ​​bearing surfaces s) on the inner circumferential surface of the bearing hole h and suppressing contact between the inner circumferential surface of the bearing hole h and the rotating shaft. In particular, even if the axial dimension of the bearing hole h is increased, the increase in the sliding area (area of ​​bearing surfaces s) on the inner circumferential surface of the bearing hole h is suppressed.

Claims

1. A sintered oil-impregnated bearing (excluding a hydrodynamic bearing) having a bearing hole that rotatably supports a rotating shaft, A sintered oil-impregnated bearing characterized by having a plurality of bearing surfaces partitioned by grooves arranged in a grid pattern on the inner circumferential surface of the bearing hole.

2. The sintered oil-impregnated bearing according to claim 1, characterized in that the grooves are arranged in a parallelogram grid or a rhombic grid.

3. A sintered oil-impregnated bearing according to claim 1 or 2, characterized in that it is used in a fan motor.

4. A method for manufacturing a sintered oil-impregnated bearing (excluding a hydrodynamic bearing) having a bearing hole that rotatably supports a rotating shaft, A process of forming a compacted powder by molding a raw material powder containing metal powder using a mold, The process of sintering the compacted powder to form a sintered body, A step of sizing the sintered body, The process involves forming a grid-like groove on the inner circumferential surface of the bearing hole in the sintered body that has undergone the sizing, A method for manufacturing a sintered oil-impregnated bearing, comprising the step of applying sizing or burnishing to the inner circumferential surface on which the groove is formed.

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