Gas distribution system of internal-combustion engine for effectively reducing quantity of flow backwards for air in and out

Abstract

The invention is an internal-combustion engine gas distributing system that effectively reduces the back flow of intake gas and exhaust gas, composed of gas valve, gas valve seat and cylinder cover, and its technical solution: the gas valve seat is provided with a sealing conical surface, the gas valve seat or cylinder cover is provided with a control conical surface, and the minimum opening section of the gas valve in the intake valve or exhaust valve angle is situated between the control conical surface and the gas valve head. Because of the control conical surface, it makes the rise of the gas valve have a very small effect on the opening section area of the gas valve in a certain range, and the opening section area is determined mainly by the maximum diameter of the gas valve head and the fitting size of the control conical surface. It obviously reduces the back flow of gas in the cylinder. In addition, as cooperating with cam outline, it can increase the plump coefficient of opening time section for the gas valve by above 15%. It is suitable for four-stroke internal-combustion engine.

Description

technical field [0001] The invention relates to a gas distribution mechanism and an intake and exhaust system of an internal combustion engine, in particular to an internal combustion engine gas distribution system composed of a valve, a valve seat and a cylinder head. technical background [0002] The ideal valve timing of the internal combustion engine is to have a small intake advance angle, intake late closing angle, exhaust advance angle and exhaust late closing angle at low speeds to prevent the gas in the cylinder from flowing back and expanding into the intake and exhaust pipes. The loss of power; and at high speed, it has a large intake late closing angle and exhaust advance angle to meet the requirements of power and economy. For this reason, some high-speed internal combustion engines use variable cam trains (VCS) or variable valve timing (VVT). However, these two mechanisms have complex structures and high manufacturing costs, so that this technology has not bee...

AI Technical Summary

Problems solved by technology

However, these two mechanisms have complex structures and high manufacturing costs, so that this technology has not been widely used. The traditional cam valve mechanism still widely uses fixed valve timing, but this fixed valve timing cannot meet the speed changes of internal combustion engines. The demand for a wide range leads to the inevitable occurrence of gas backflow in the valve overlap angle and intake delay closing angle

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