| 摘要 |
A thin-wall hollow push rod has in it a co-axial tube of small bore running from end to end through the hollow interior thereof. The bore of the tube is sufficiently large to permit a controlled stream of oil under pressure to flow therethrough, and sufficiently small as to prevent churing of the oil which produces a foam having bubbles in the oil stream. This hinders return of oil to the crank case. Ball surface bearings with bores therethrough are affixed at each end of the tube, and the ends of the tube are disposed in counterbores in the ball surface bearings.
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