Combustion chamber of petrol engine

Abstract

The invention relates to a combustion chamber of a gasoline engine, which is sunken on a cylinder cover, the maximum cross section area of the combustion chamber is at the bottom of the cylinder cover, wherein the peripheral profile of the whole combustion chamber takes the shape of half mussel; the maximum cross section of the combustion chamber of the gasoline engine is formed by six asymmetric arc segments (8, 9, 10, 11, 30, 31) which are smoothly connected; a center line (2) of inlet and exhaust valves (12, 13) on the bottom plane of the cylinder cover is at the left side of a center line (1) of the cylinder, and the intersection point of a longitudinal center line of a spark plug (3) and a bottom surface (16) of the cylinder cover is at the right side of the center line (1) of the cylinder.

Description

Technical field [0001] The invention relates to a combustion chamber of a gasoline engine, in particular to a combustion chamber of a gasoline engine with a small displacement overhead valve. Background technique [0002] The combustion chamber of a gasoline engine plays an extremely important role in the entire combustion process. Usually, the combustion chamber of a gasoline engine adopts a basin-shaped combustion chamber structure, such as figure 1 , figure 2 as shown, figure 1 It is the front view of the gasoline engine basin type combustion chamber in the prior art, figure 2 yes figure 1 A partial top view of the gasoline engine bowl combustor shown. Among them, 1' is the cylinder centerline, 2' is the valve centerline, L' is the distance between the valve centerline 2' and the cylinder centerline 1', and the pot-shaped combustion chamber consists of four sections: 4', 5', 6', and 7' Composed of arc segments, arc segments 4' and 6' are arc segments with the cente...

AI Technical Summary

Problems solved by technology

However, due to the small cylinder diameter of modern small-displacement gasoline engines, and the relative area occupied by the valves is relatively large, the projected area of ​​the basin-shaped combustion chamber is increased, and the squeeze area is reduced. In addition, the compression ratio of modern gasoline engines is high, and the combustion chamber The volume is relatively smaller. If the basin-shaped combustion chamber is used, the depth cannot be increased due to the large projected area. The combination of the two will lose the squishing effect that the basin-shaped combustion chamber should have, resulting in too low turbulence in the combustion chamber. , the combustion speed slows down, post-combustion or incomplete combustion occurs, and HC and CO are easily produced during the combustion process, which cannot meet the working requirements and exhaust emission requirements of modern gasoline engines

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