Intake manifold that directs crankcase ventilation gases

Abstract

The invention provides an intake manifold capable of guiding ventilation gas of a crankcase. The intake manifold comprises a gas flow inlet, a flange face and multiple gas flow outlets located in the flange face. Each gas flow outlet communicates with an air cylinder of an engine and supplies gas to the air cylinder communicating with the gas flow outlet. The intake manifold further comprises a crankcase ventilation gas auxiliary cavity located in the lower side of the flange face. The crankcase ventilation gas auxiliary cavity comprises a crankcase ventilation gas inlet, a first connecting hole and a second connecting hole. The second connecting hole is higher than the first connecting hole, the first connecting hole and the second connecting hole communicate with the gas flow outlets, and the ventilation gas of the crankcase flows into the crankcase ventilation gas auxiliary cavity through the crankcase ventilation gas inlet. Due to the high temperature of the flange face, condensation of the ventilation gas of the crankcase is reduced. The first connecting hole and the second connecting hole are used for guiding the ventilation gas of the crankcase into the corresponding gas flow outlets.

Description

technical field [0001] The invention relates to an air intake device of an engine, in particular to an intake manifold capable of guiding crankcase ventilation gas. Background technique [0002] When the engine is working, the high-pressure combustible mixture and burned gas in the combustion chamber will more or less leak into the crankcase through the gap between the piston group and the cylinder, causing blow-by. The components of blow-by gas are unburned fuel gas, water vapor and exhaust gas, etc., which will dilute the engine oil, reduce the performance of the engine oil, and accelerate the oxidation and deterioration of the engine oil. Moisture condenses in the engine oil, which will form sludge and block the oil circuit; the acid gas in the exhaust gas will be mixed into the lubrication system, which will cause corrosion and accelerated wear of engine parts; blow-by gas will also cause the pressure of the crankcase to be too high and damage the crankcase. Sealed to a...

AI Technical Summary

Problems solved by technology

In addition, in order to meet the increasingly stringent emission requirements and improve the economy, the crankcase ventilation system must also be designed in the design process of the automobile engine, so that the airflow of the crankcase is introduced into the engine cylinder for re-combustion, but in the cold area (such as -10 ℃ ~-30℃), because the intake air temperature in the intake manifold is low, tens of degrees below zero, after the crankcase ventilation gas is mixed with the low-temperature gas, the temperature drops, even below zero, and the crankcase ventilation gas contains Water vapor will condense into water droplets or even freeze, which will freeze the throttle valve, block the curved pipe or block the intake pipe, and affect the normal operation of the engine

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