| 摘要 |
In a steel oil ring assembly which includes an upper rail, a lower rail and a spacer embraced by the rails and having radially extending corrugations, the spacer is split at one location to form abutting ends which come into pressured contact with each other at a force point positioned on a line passing through the corrugations substantially at respective centers thereof in the radial direction. The spacer has an opening, which defines an angle of 10~ ~ 9~ , extending radially outward from the force point to the abutting ends.
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