Cast iron exhaust manifold for supercharged gasoline engine

Abstract

The invention discloses a cast iron exhaust manifold for a supercharged gasoline engine, comprising a plurality of air passages, wherein an inlet flange is molded at the inlet end of each air passage in an integrated casting way, and an outlet flange is molded at the outlet end of each air passage in an integrated casting way. The middle position of each inlet flange is machined with a notch to separate the inlet flange into a left section and a right section so as to release heat stress of a flange plate of the cast iron exhaust manifold, and thus the heat deformation of the cast iron exhaust manifold is reduced; and heat shield mounting lugs are arranged at two ends of each inlet flange close to the first air passage and the fourth passage, the mounting points are arranged on the inlet flange with lower temperature as possible, and thus the arrangement of heat shield mounting points at an area with higher temperature is avoided, the quantity of high-temperature-resistance bolts is reduced, and the cost is lowered.

Description

technical field [0001] The invention relates to a supercharged gasoline engine exhaust system, in particular to an engine cast iron exhaust manifold structure. Background technique [0002] Gasoline engine supercharging can achieve the purpose of increasing power, improving economy and reducing emissions. With the introduction of a large number of domestic energy-saving and emission reduction policies and regulations, major automobile companies are paying more and more attention to turbocharging technology. Gasoline engine supercharging has become a trend . At present, most of the exhaust manifolds for supercharged gasoline engines are cast iron exhaust manifolds. The main structure is composed of inlet and outlet flanges and air passages. The air passages are usually equipped with heat shield mounting straps. [0003] Gasoline supercharged engine exhaust temperature is very high, generally exceeding 900 ℃, too high exhaust temperature not only puts higher requirements on t...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly provides a cast iron exhaust manifold structure for a supercharged gasoline engine to ensure the reliability of the exhaust manifold and solve the problems of large thermal deformation, easy cracking and air leakage of the exhaust manifold during high-load operation , and use the low temperature area of ​​the exhaust manifold to minimize the installation points of the heat shield on the air passage, thereby reducing the number of expensive high temperature resistant bolts and reducing the cost of the whole machine

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