Tent shaped overhead four-air valve petrol engine combustion chamber

Abstract

A tent type top-placed 4-valve gasoline combustion chamber comprises a piston, a cylinder head, a spark plug, two intake valves, and two exhaust valves. The lower part of the cylinder head concaves inward and forms a cavity; the top of the cavity forms two slant faces toward two sides, and the two slant faces are connected by a raised face; the two intake valves and the two exhaust valves are respectively distributed at two sides of the top of the cavity; the perimeter of the cavity is formed by certain height, is roughly square; the top of the piston is a plane; the lower plane of the cavity, the intake valves and the exhaust valves, and the top plane of the pistons form a tent-like combustion chamber; the spark plug is located at the raised face at top of the cavity and 1.5 mm to the central line of the combustion chamber and towards the exhaust valves; the included angle between the central line of the intake valves and the central face of the cylinder is 12 degree 2 minutes; the included angle between the central line of the exhaust valves and the central face of the cylinder is 11 degree 47 minutes. In the invention, the included angles of the valves are small, so that the combustion chamber is compactly arranged, the explosive proofness and compression ratio are improved, and the maneuverability and economy of the whole engine are improved.

Description

technical field [0001] The invention belongs to the field of gasoline engine combustion chambers, in particular to a tent-shaped top-mounted four-valve gasoline engine combustion chamber which can increase the compression ratio and improve the power and economy of the whole machine. Background technique [0002] The combustion chamber shapes of gasoline engines generally have the following types: multi-spherical, wedge-shaped and basin-shaped. [0003] The spark plug of the wedge-shaped combustion chamber is offset. Due to the arrangement of the spark plug, the flame propagation distance is long, so the combustion rate is low, the heat dissipation is large, and the thermal efficiency is low. [0004] The valve diameter of the basin-shaped combustion chamber is easily restricted, and the effect of intake and exhaust is poor. [0005] figure 1 It is the bottom view of the combustion chamber of the prior art 376QE gasoline engine. Such as figure 1 As shown, the combustion c...

AI Technical Summary

Problems solved by technology

[0006] In gasoline engines, the TJ376QE engine with a displacement of 1 liter is more commonly used. Due to the small size of the engine, the structure of its combustion chamber is multi-spherical. The disadvantages are that the spark plug is offset, the flame distance is long, the combustion rate is low, and the thermal efficiency is low.

Combustion chamber area to volume ratio is large, volumetric efficiency is small

[0007] In addition, the included angle between the intake valve, exhaust valve center line and the cylinder center plane of the TJ376QE gasoline engine is 23.5°, and the valve included angle is large, which makes the arrangement of the combustion chamber not compact and the compression ratio cannot be improved.

Images