| 摘要 |
<p>The present invention provides a spacer expander of a combined oil ring having a narrow axial width, wherein the spacer expander is excellent in followability and stability and effective in reducing engine oil consumption. In a combined oil ring 20 having a spacer expander 50 to be installed between a pair of upper and lower side rails 30, 40, a plurality of axially protruding inner peripheral protruding portions 51, 52, 53 are formed on the inner peripheral side of the spacer expander 50 along its peripheral direction. The inner peripheral protruding portions press the inner peripheral surface of the side rails. On the outer peripheral side of the spacer expander, a plurality of slits 54 are formed, and a plurality of connecting portions 55 are located in the peripheral direction isolated by the slits 54. On the plurality of connecting portions 55, axially protruding outer peripheral protruding portions 56, 57, 58 are formed.</p> |
