Gas-oil separation structure of engine

Abstract

The invention provides a gas-oil separation structure of an engine. In the structure, a breathing chip is arranged at a breathing channel between the inner cavity of a cylinder brainpan and the inner cavity of a crankcase; the cylinder brainpan is provided with an exhaust port communicated with the inner cavity of the cylinder brainpan; a first oil return hole leading to the inner cavity of the crankcase is arranged at the lowest part of the inner cavity of the cylinder brainpan; the engine is also provided with a breathing cavity with an air inlet and an air outlet; a leaf valve is arranged at the air inlet of the breathing cavity; the air inlet of the breathing cavity is communicated with the exhaust port on the cylinder brainpan via a first breather pipe; the air outlet of the breathing cavity is communicated with the admission pipe of a carburetor via a second breather pipe; and a second oil return hole is arranged at the lowest part of the breathing cavity. In the invention, oil gas exhausted from the crankcase of the engine can be fully separated and recovered, thus facilitating reduction of engine oil consumption of the engine, and reducing the engine oil content in the exhaust gas entering into the carburetor after being recovered, thereby improving combustion and reducing carbon deposition in a combustion chamber.

Description

technical field [0001] The invention relates to an engine, especially an oil-gas separation structure of the engine. Background technique [0002] When the engine is working, there is always a part of combustible mixture and exhaust gas passing through the piston ring into the crankcase, and the gasoline vapor condensed into the crankcase will make the engine oil thinner and the performance will deteriorate. The exhaust gas contains water vapor and sulfur dioxide. The water vapor condenses in the engine oil to form foam, which damages the oil supply. This phenomenon is especially serious in winter; sulfur dioxide meets water to form sulfurous acid, and sulfurous acid forms sulfuric acid when it meets oxygen in the air. The appearance of oil not only deteriorates the oil, but also corrodes the parts. As the combustible mixture and exhaust gas enter the crankcase, the pressure in the crankcase will increase, and the engine oil will leak from the crankshaft oil seal, crankcas...

AI Technical Summary

Problems solved by technology

[0004] Existing known engines usually use a single breather or reed valve separator structure, the oil-air mixture coming out of the crankcase is only separated once, the oil-gas separation effect is not good, and the oil consumption is too large

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