Connection structure of engine exhaust gas reclrculation pipe and plastic intake manifold

Abstract

The invention discloses a connection structure of an engine exhaust gas reclrculation pipe and a plastic inlet manifold, comprising an exhaust gas recirculation inlet pipe and a plastic inlet manifold, a thermal sleeve pipe is arranged on the connection part of the exhaust gas recirculation inlet pipe and the plastic inlet manifold, the thermal sleeve pipe is arranged in an entrance of a connection lug boss of the plastic inlet manifold, a connecting head of the exhaust gas recirculation inlet pipe is inserted into the thermal sleeve pipe, and the exhaust gas recirculation inlet pipe and the plastic inlet manifold are connected and mutually separated by the thermal sleeve pipe. The connection structure can avoid the direct contact of the exhaust gas recirculation inlet pipe and the plastic inlet manifold, directly conducts high temperature to the plastic inlet manifold, reduces the wall surface temperature of the inlet manifold of the connection of the EGR (Exhaust Gas Recirculation) pipe and the plastic inlet manifold, better protects the inlet manifold, and improves the reliability of the plastic inlet manifold with the EGR system.

Description

technical field [0001] The invention relates to an engine exhaust gas recirculation system (Exhaust Gas Recirculation system). Background technique [0002] The exhaust gas recirculation system of the engine can effectively reduce the emission of the engine and the fuel consumption rate, and the exhaust gas recirculation (hereinafter referred to as EGR) technology is widely used in the engine. Since this technology is to reintroduce the high-temperature exhaust gas of the engine into the intake system, this leads to a high temperature on the wall surface of the intake manifold material at the connection between the exhaust gas recirculation pipe and the intake manifold. Generally, the allowable temperature of the aluminum alloy intake manifold is 250 degrees Celsius, and the allowable temperature of the plastic intake manifold is 130 degrees Celsius. Due to its advantages of low heat conduction, smooth wall and low density, plastic intake manifold has been widely used in th...

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Problems solved by technology

[0003] The invention proposes an improved connection structure between the engine exhaust gas recirculation pipe and the plastic intake manifold. The purpose is to solve the ablation and melting of the plastic intake manifold by the high-temperature gas in the engine EGR system. low sex problem

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