| 摘要 |
A four-stroke cycle internal combustion engine, having a crankcase. A connecting rod is provided in the crankcase. An inner wall extends to surround all sides and the bottom of the connecting rod. An outer wall extends to surround the inner wall. The upper ends of the outer wall are connected to the inner wall to form an oil reservoir under the crankcase and oil recess areas on both sides of the crankcase therebetween. An oil dipper for splattering the oil contained in the oil reservoir is provided at the big end of the connecting rod. A slit is formed at a bottom of the inner wall for allowing the oil dipper to go though to make contact with the oil.
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