Exhaust manifold assembly

An exhaust manifold and assembly technology, which is applied in the field of engine exhaust manifold assembly structure, can solve the problems of unfavorable three-way catalytic converter conversion efficiency durability, unfavorable exhaust manifold structure compactness, three-way catalytic converter stroke Long and other problems, to achieve the effect of being conducive to the layout of the space structure, reducing the interference of air pressure pulses, and reducing the loading space

Inactive Publication Date: 2013-10-30
CHONGQING CHANGAN AUTOMOBILE CO LTD
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AI Technical Summary

Problems solved by technology

[0004] However, due to the independent symmetrical air passages converging at the junction of the three-way catalytic converter, the air flow inside the air passages must meet, and the large air flow pressure difference at the confluence requires a longer air passage stroke to adjust the air pressure in each air passage. , which is not conducive to the compact structure of the exhaust manifold and is difficult to arrange; because the exhaust gas enters the three-way catalytic converter for a long journey, it is not conducive to the three-way catalytic converter to maintain high conversion efficiency and good durability

Method used

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Embodiment Construction

[0016] Such as figure 1 , figure 2 As shown, the exhaust manifold assembly includes an exhaust air passage 6 and a three-way catalytic converter 9 connected to the exhaust air passage 6. One end of the exhaust air passage 6 is a branch air passage and is respectively connected to the cylinder head through the flange plate 5. The exhaust port is connected, and the adjacent branch air channels merge into a "Y" branch along the airflow direction, and the adjacent branch air channels that merge into a "Y" branch correspond to non-adjacent working cylinders, and each "Y" branch The main exhaust air passage 10 is connected with the inlet port 8 of the three-way catalytic converter 9 and merges with the exhaust main air passage 10 at the other end of the exhaust air passage 6 .

[0017] After the piston in one cylinder works and exhausts, the piston in the second cylinder immediately performs work and exhausts, and then the piston in the third cylinder performs work and exhausts. ...

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Abstract

The invention discloses an exhaust manifold assembly structure which is symmetrical and compact in structure. By the aid of the exhaust manifold assembly symmetrical in structure, tail gas entering a three-way catalyst is ensured to be even, and air pressure impulse interference is reduced. Sub-branch manifolds connecting with every cylinder cover exhaust port are preferably converged to form 'Y'-shaped branches, and the 'Y'-shaped branches are converged at the position of a main exhaust manifold of the exhaust manifold, so that the exhaust manifold assembly is ensured to be shorter and more compact in structure, stroke length of the exhaust manifold assembly is shortened, and high converting efficiency and good durability of the three-way catalyst can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to an engine exhaust manifold assembly structure. Background technique [0002] At present, due to the increasingly stringent emission regulations, more and more attention is paid to automobile exhaust emissions. The control of automobile exhaust emissions mainly adopts three-way catalytic post-treatment technology. In order to maintain high conversion efficiency and good durability of three-way catalytic converters, generally adopt Close-coupled exhaust manifold catalytic converter assembly, at the same time requires the exhaust manifold to discharge into the catalytic converter assembly evenly, avoiding the connection between the exhaust manifold and the three-way catalytic converter during the exhaust process of adjacent working cylinders Generate airflow and air pressure pulse interference. [0003] Exhaust manifolds in the prior art, in order to avoid airflow inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N13/10
Inventor 贾友昌赵蕾杜潇叶坚
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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