Straight six-cylinder car engine exhausting pipe system

Abstract

The invention discloses an upright six-cylinder car engine exhaust pipe system, which comprises an exhaust manifold, exhaust pipes, a catalytic converter and a muffler. The exhaust manifold comprises a first exhaust manifold connected with the three exhaust pipes of an engine, and a second exhaust manifold connected with the other three exhaust passages of the engine. The exhaust pipe comprises a first exhaust branch pipe and a second exhaust pipe. One end of the second exhaust branch pipe is connected with the second exhaust manifold, and the other end of the second exhaust branch pipe is connected with the muffler. The exhaust system provided by the invention divides the six cylinder passages into two groups; three cylinder passages constitute one group, and are connected with one exhaust manifold, thus simplifying the design, improving the manufacturability, reducing the cost and improving the service life of the exhaust manifold. As the pipeline from the exhaust manifold to the catalytic converter is long, the uniformity of exhaust through the catalytic converter is improved, thus improving the exhaust gas purification efficiency.

Description

technical field [0001] The invention relates to an automobile exhaust pipe system, in particular to an exhaust system for an upright six-cylinder automobile engine. Background technique [0002] The exhaust system refers to the piping system that collects the exhaust from each cylinder of the engine and directs the exhaust airflow to the external environment. Automobile exhaust systems generally have the functions of converging airflow, guiding airflow, catalytic conversion of toxic gases in exhaust gas, and noise reduction. [0003] Usually, on an upright six-cylinder car engine, six air passages are used. One type of exhaust system is that the six air passages directly collect the exhaust gas to the main exhaust pipe, then pass through the main muffler, the tail muffler, and finally the exhaust gas The exhaust gas is discharged into the external environment, this type is called 6-1 type. The exhaust manifold in the exhaust system combines the exhaust gas in the exhaust p...

AI Technical Summary

Problems solved by technology

In this traditional exhaust system, the size of the six exhaust ports of the six-cylinder engine is relatively large when connected, and the exhaust manifold has a large curvature from the exhaust port of the six-cylinder to the converging end of the exhaust pipe, often due to excessive thermal stress. Cracks occur, which shortens the service life of the exhaust manifold; this exhaust manifold collects the exhaust gas in the six-cylinder air passage to the exhaust pipe converging end. Since the car engine is sequentially fired in the six cylinders, it is collected The six-cylinder exhaust passages in one place will generate exhaust resistance to each other, and the efficiency of the exhaust pipe is not high; the exhaust pipe is formed by converging the six-cylinder air passages, the design is more complicated, the manufacturing is difficult, and the cost is relatively high

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