An exhaust system mounting nut

Abstract

The invention discloses an exhaust system mounting nut. The exhaust system mounting nut comprises an anti-loosening end and a buffering end located under the anti-loosening end, and the buffering end and the anti-loosening end are of an integrated structure. The anti-loosening end is provided with an inner threaded hole. A through hole communicating with the inner threaded hole is formed inside the buffering end. A tightening portion and a pressing portion are arranged on the outer side face of the buffering end. The pressing portion is located below the tightening portion. The outer side face of the anti-loosening end is round and is provided with squeezing grooves symmetrically distributed around the axis of the anti-loosening end, and the inner threaded hole is oval after being squeezed. The exhaust system mounting nut aims to prevent loosening and improve the sealing performance of an exhaust manifold of an engine with a turbocharger.

Description

technical field [0001] The invention belongs to the field of automobile exhaust system assembly, in particular to an exhaust system mounting nut. Background technique [0002] As emission regulations become more stringent, engines with turbochargers are becoming more common. At present, between the engine and the exhaust manifold, a heat insulating sleeve and an exhaust manifold gasket are mainly used on the double-ended studs, and are fixed by nuts. However, since the exhaust temperature of a turbocharged engine is higher than that of a normal naturally aspirated engine and the modal vibration is stronger, thermal expansion and contraction can easily lead to loosening of the exhaust manifold mounting bolt assembly. After the engine has been running for a long time, the studs, nuts, exhaust manifold gaskets, and exhaust manifold that install the exhaust manifold are all squeezed in a hot state, and cannot be tightened after the engine cools down Finally, the exhaust manifo...

AI Technical Summary

Problems solved by technology

However, since the exhaust temperature of a turbocharged engine is higher than that of a normal naturally aspirated engine and the modal vibration is stronger, thermal expansion and contraction can easily lead to loosening of the exhaust manifold mounting bolt assembly

After the engine has been running for a long time, the studs, nuts, exhaust manifold gaskets, and exhaust manifold that install the exhaust manifold are all squeezed in a hot state, and cannot be tightened after the engine cools down state, and finally the exhaust manifold installation bolt assembly is loose, resulting in the occurrence of exhaust manifold air leakage problems

Due to the poor sealing of the exhaust manifold, the exhaust gas is directly discharged to the nature, which cannot meet the requirements of environmental protection, and is also the biggest hidden danger of burning cars

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