Plastic intake manifold air path for gasoline engine

Abstract

A plastic intake manifold air path for a gasoline engine overcomes the problems that as the existing intake manifold air path is long, the intake efficiency is influenced, the uniform symmetric space structure of a pressure pressurizing cavity is influenced, turbulence is easily caused to the pressure stabilizing cavity, the intake uniformity of four branch pipe air paths is poor, the pressure loss is large, and furthermore, the dynamic property and discharging property of the engine are influenced. The plastic intake manifold air path is characterized in that a pressure stabilizing cavity is in an asymmetric irregular shape; airflow inlets of branch pipeline air paths are directly connected with the upper wall of the pressure pressurizing cavity; the length of the central line of the first branch pipe air path is 78.3mm; the length of the central line of the second branch pipe air path is 73mm; the length of the central line of the third branch pipe air path is 73mm; the length of the central line of the fourth branch pipe air path is 78.4mm; the central lines of the four air paths consist of linear segments and arc segments. The plastic intake manifold air path has the beneficial effects as the air path is shorter, the occupied space of the air path is reduced, the airflow resistance is reduced, the intake uniformity meets the + / -3% demands, the pressure loss is small, and the dynamic property of the engine is favorably improved.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, in particular to a plastic intake manifold air passage of a gasoline engine. Background technique [0002] For the intake manifold, the key parameters that affect the engine performance are the length of the intake manifold, the cross-sectional area of ​​the outlet and the inlet of the airway, and the volume of the surge chamber. In the prior art, in order to make the combustion conditions of each cylinder the same, the intake manifold generally adopts the design principle of equal length, and the length and curvature of the manifold of each cylinder should be the same as possible, so that the intake air of each cylinder is uniform. Sex is better. For example, the invention "an engine intake manifold" disclosed in the invention patent application with the application number of CN200710092898.X filed by Chongqing Changan Automobile Co., Ltd. is composed of a resonant cavity and a plura...

AI Technical Summary

Problems solved by technology

The maximum value of the air intake uniformity coefficient of the intake manifold airway in the prior art is 3.24%, which exceeds the limit of ±3% allowed by the project

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