| 摘要 |
<p>A grease-feeding through-hole (20<SUB>1</SUB>) is formed in one outer link plate (3<SUB>1</SUB>), and a grease-feeding means (21) is fitted to the through-hole. A grease-discharging through-hole (20<SUB>2</SUB>, 20<SUB>3</SUB>) is formed in an outer link plate (3<SUB>2</SUB>) or an inner link plate (2<SUB>2</SUB>) located on the side separated from the outer link plate (3<SUB>1</SUB>) with a bearing section (A) in between them, and a grease-discharging means (22) is fitted to the through-hole. Lubricant placed from the grease-feeding means (21) is fed to the bearing section (A) through a gap (c) between a sealing means (6) and an outer link plate (3), and old lubricant in the bearing section (A) is discharged from the grease-discharging means (22) through the gap (c).</p> |
