| 摘要 |
A cylinder block has a chamber communicating with a cylinder sleeve. The cylinder sleeve has spiral recesses on the outer periphery of the cylinder sleeve. Spaced through holes are on the spiral recesses. Oil-seepage holes are on the periphery of the oil pipe. The oil pipe coils around the cylinder sleeve along the spiral recesses. An oil-collecting groove is beneath the cylinder sleeve to communicate with an outlet pipe. An inlet pipe communicates with the upper end of the cylinder sleeve. The upper end of the oil pipe communicates with the inlet pipe.
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