Sliding bearing having improved lubrication characteristics
View Patent ↗The present disclosure relates to a sliding bearing which is usefully applicable to equipment to which high surface pressure is applied, by processing an inner surface of a sliding bearing manufactured in the form of a sintered body to be optimized to lubrication characteristics.
1. A sliding bearing for use with a construction equipment, which comprises a porous iron (Fe) based sintered alloy, wherein:
copper is dispersed and contained in the sintered alloy by 13 to 23 wt. %;
effective porosity with respect to the whole volume of the sliding bearing is 13 to 23 vol. %;
helical shaped unevenness is formed at an inner circumferential surface of the sliding bearing;
surface roughness Ra of the inner circumferential surface is 2 to 5 μm;
a difference in elevation of the unevenness is in the range from 13 to 30 μm;
an interval of the unevenness is in the range from 200 to 290 μm; and
surface air holes are opened;
wherein an opened hole area ratio, which is a ratio of an area of the air holes to the whole area of the inner circumferential surface at the inner circumferential surface of the sliding bearing, is 13 to 23%.
2. The sliding bearing of claim 1 , wherein the sliding bearing is for use with a joint unit of construction equipment having a working condition in which a surface pressure is 3 to 10 kgf/mm 2 and a sliding speed is 1 to 8 cm/s.
3. The sliding bearing of claim 1 , wherein at least one type of alloy element selected from a group consisting of Ni, Sn, Mo, W, Mn, and B is further included in the iron (Fe) based sintered alloy.