| 摘要 |
<p>An oil control piston ring is described comprising a pair of axially spaced apart side rails (16,18) , the side rails each having a radially outer periphery forming a rubbing face (32,34) with a co-operating cylinder wall (38) , an expander (10) having portions (48) which lie between the inner radially extending faces (26,28) of the side rails and maintain the outer peripheral rubbing faces thereof in a spaced apart relationship characterised in that the radially inner peripheral edge of each side rail is connected by bridging members (20) extending intermittently over at least a part of the inner circumferential length. The side rails and bridge members may be formed from a substantially flat bottomed "U-shaped" channel section.</p> |
