Structure of a crankcase ventilation system for a supercharged engine

Abstract

The invention relates to a supercharged engine crank case ventilating system structure, and belongs to the technical field of vehicle engines. The structure comprises an oil bottom shell, a crank case, a piston assembly and a cylinder, wherein the piston assembly and the cylinder are arranged on the crank case. A cylinder head cover is communicated with one end of a high-load crank case ventilating pipe and one end of a low-load crank case ventilating pipe. The other end of the high-load crank case ventilating pipe is communicated with the output end of an air filter and communicated with theinput end of a supercharger. The other end of the low-load crank case ventilating pipe is communicated with the input end of an intake manifold. The output end of the intake manifold is communicated with the cylinder. The top of the crank case is communicated with one end of an air supplementation channel. The other end of the air supplementation channel is communicated with the high-load crank case ventilating pipe. The ventilation problem of a first check valve and a third check valve in a forward direction and a backward direction respectively is solved, redundant design is avoided, and meanwhile the reliability and durability of an engine are improved.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a crankcase ventilation system structure of a supercharged engine. Background technique [0002] The unburned mixed gas and burned exhaust gas in the engine cylinder will enter the crankcase through the gap between the piston group and the cylinder, which is usually called piston blow-by. If the piston leakage cannot be discharged in time, the direct result is that the pressure in the crankcase will gradually increase, which will eventually force the oil dipstick or the crankshaft oil seal to come out, and the oil will leak. The fuel vapor, water vapor, especially the toxic and harmful by-products in the piston blow-by gas are directly discharged into the atmosphere, which will seriously pollute the environment and affect people's health. In order to solve the above problems, automotive engines usually design positive crankcase ventilation (Positive Crankcase Ventilat...

AI Technical Summary

Problems solved by technology

However, the manufacturing cost of the three-way crankcase ventilation system is relatively high, and an additional pipeline is required to connect the crankcase and the air filter outlet, which reduces the adaptability of the engine.

Images