| 摘要 |
An engine lubricating system of an internal combustion engine, comprising lubricating oil delivery means for delivering lubricating oil under controlled pressure when the engine is in operation, the lubricating oil delivery means comprising a primary filter unit having included therein a porous filter medium having perforations of a first range of sizes, first lubricating means communicating with the lubricating oil delivery means through a first oil feed passageway and operable for circulating oil from the lubricating oil delivery means to the power producing mechanism of the engine, and second lubricating means communicating with the lubricating oil delivery means through a second oil feed passageway and operable for circulating oil from the lubricating oil delivery means to the valve drive mechanism of the engine, the second lubricating means comprising a secondary filter unit having included therein a porous filter medium having perforations of a second range of sizes smaller than the first range of sizes.
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