| 摘要 |
<p>A combined oil ring (1) includes an oil ring (2) having upper and lower rails (7,8) formed integrally at an outer circumferential side of the oil ring (2) to slide on a cylinder wall (11); a coil expander (3) installed at an inner circumferential side of the oil ring (2) to force the oil ring (2) radially outwards; and a side rail (4) installed at an upper side of the oil ring (2) and having no torsion along an axial direction of the oil ring (2).</p> |
