Engine exhaust manifold assembly

Abstract

The invention discloses an engine exhaust manifold assembly. The front end mouth portion of each exhaust manifold is extended and is mounted at intervals on an air inlet flange, a three-way catalyst is cylindrical, the back end of each exhaust manifold is gathered together and connected with the front end of the three-way catalyst through a horn-shaped transition tube, the inner diameter of the horn-shaped transition tube is gradually increased from the front end to the back end, the air inlet flange is a casting part and is sleeved at the back end of the three-way catalyst, an included angle alpha of 20-80 degrees is formed between the front end face and the back end face of the air inlet flange, the inner diameter of the air inlet flange is gradually decreased from the front end to the back end, the back end of the three-way catalyst is inserted into the front end mouth portion of the air inlet flange and is welded with the air inlet flange, and the back end mouth portion of the air inlet flange extends outwards to form a flange mounting plate. The engine exhaust manifold assembly has the advantages of simple structure, low air discharging back pressure, good engine dynamic property, small heat loss, high cold starting property and the like, and requirements of national five emission standards can be met.

Description

technical field [0001] The invention relates to an engine exhaust system, in particular to an engine exhaust manifold assembly structure. Background technique [0002] The engine exhaust manifold is one of the key components of the engine exhaust system. Its working condition is directly related to the working reliability and durability of the engine, and at the same time directly affects the emission performance of the engine. With the continuous improvement of people's awareness of environmental protection, in order to avoid the threat of severe weather such as smog to human health, the newly issued National V emission standards put forward higher requirements for engine emissions, and as the exhaust system of the engine The performance requirements of the key component - the exhaust manifold assembly are getting higher and higher. [0003] The State Intellectual Property Bureau discloses an engine exhaust manifold assembly with a three-way catalytic converter (patent num...

AI Technical Summary

Problems solved by technology

To a certain extent, this structure solves the problem that the three-way catalytic converter cannot meet the emission requirements due to the low temperature of the exhaust gas during cold start, reduces the emission pollution of the automobile engine and the manufacturing cost of the engine exhaust manifold assembly, and can Meet the emission standards of China IV, but cannot meet the emission standards of China V

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