| 摘要 |
A lubrication system of a four-stroke engine; the four-stroke engine comprises an oil pan (2) for storing lubricating oil, a crankcase (1), a cam chamber (3), a rocker arm chamber (4), and a distribution chamber (5) communicating with the oil pan and being used to separate an oil-gas mixture into oil vapor and liquid oil. The lubrication system comprises: the oil pan communicates with the crankcase via an oil supply channel (21), and a first one-way valve (212) is provided in the oil supply channel; the crankcase communicates with the distribution chamber via a first oil transportation channel (15), and a second one-way valve (151) is provided in the first oil transportation channel; the cam chamber communicates with the rocker arm chamber via a second oil transportation channel (34); the rocker arm chamber communicates with the crankcase via at least one oil return channel (41), and a third one-way valve (413) is provided in the oil return channel; and the distribution chamber comprises an oil discharging hole (500) provided at a top surface of the distribution chamber, and the lubricating oil enters the cam chamber via the oil discharging hole, thus reducing consumption of the lubricating oil. |
