| 摘要 |
A lubrication system (30) for a four cycle engine (1, 10) lubricates the valve mechanism with the oil mist of the concentration lowered by the liquefying means (70). The lubrication system (30) has an oil feeding passage (34, 154) for connecting an oil reservoir (7, 107) and the crank chamber (5a, 105a) and sending the oil (A) retained in liquid form in the oil reservoir (7, 107) to the crank chamber (5a, 105a) under a negative pressure of the crank chamber (5a, 105a), a communication passage (39, 159) for connecting the crank chamber (5a, 105a) and the oil reservoir (107) and sending oil mist generated in the crank chamber (5a, 105a) to the oil reservoir (7, 107) when under a positive pressure of the crank chamber (5a, 105a), liquefying means (70) in the oil reservoir (7, 107) for liquefying the oil mist sent from the communication passage (39,159) to the oil reservoir (7, 107) to decrease the concentration of the oil mist, and a supply passage (31,151) for supplying the oil mist from the oil reservoir (7, 107) to the valve-operating chamber (4, 130) through the liquefying means (70).
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