Engine oil cooling structure of an engine

An engine oil cooling structure of an engine, the engine comprising a crankcase, the crankcase being provided with an oil filter mounting chamber having a cylindrical shape, the cooling structure comprising a water channel, a water inlet of the water channel communicating with a water pump, the crankcase being provided with a main oil channel for conveying engine oil, wherein the crankcase is further provided with a heat conducting thin wall, an inner cavity of the heat conducting thin wall forms the oil filter mounting chamber, the oil filter mounting chamber communicates with the main oil channel, the water channel is arranged around an outer side wall of the heat conducting thin wall, and a water outlet of the water channel communicates with a cooling water channel arranged in the same direction as and adjacent to the main oil channel;

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• wherein an inner wall of the main oil channel is provided with lubricating oil channels communicating with revolute pairs of a crankshaft, a cavity having a bar shape and arranged in the same direction as the main oil channel is formed between the main oil channel and a middle section of the cooling water channel, and a position of the lubricating oil channel closest to the oil filter mounting chamber in a direction in which the main oil channel is disposed is opposite to a position of the cavity.