JPS6212828Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a cylinder head for a two-stroke engine, and is designed to give a swirl effect and a squish effect to the air-fuel mixture taken into the combustion chamber.

Various efforts have been made to improve combustion efficiency and purify exhaust gas even in two-stroke engines. This invention is one of those efforts, and aims to provide a two-stroke engine that has a simple structure and is capable of burning even a lean mixture with high efficiency.

First, the cylinder head of a typical two-stroke engine will be explained with reference to FIG. 1. Reference numeral 1 is a cylinder head, 2 is a cylinder, and a piston 3 is fitted inside the cylinder 2 so as to be able to move up and down. A spark plug 4 is attached to the center of the cylinder head 1 and faces a combustion chamber 5 formed between the inner walls of the cylinder head 1 and the cylinder 2 and the piston 3.

Next, one embodiment of this invention will be explained with reference to the drawings. Fig. 2 is a bottom view of the cylinder head 1 seen from below, and the intake port of the engine is provided at the lower position in Fig. 2. , the exhaust port of the engine will be provided at the upper position in FIG.

On the inside of the cylinder head 1 forming the upper wall of the combustion chamber 5, as shown in FIGS. Grooves 6 are formed along the wall of the combustion chamber 5, gradually becoming shallower and narrower toward the exhaust port, and connecting from both sides. is formed.

In this two-stroke engine configured in this way, during the compression process in which the piston 3 rises, the air-fuel mixture is compressed in the combustion chamber 5 whose volume gradually decreases. In the final process, as shown by the arrow in Figure 9,
The air-fuel mixture is compressed by squirting from the entire circumference of the groove 6 and enters the groove 6, and as the depth and width of the groove 6 change, the mixed gas generates a swirl within the groove 6, resulting in a uniform mixed state. The flow then flows towards the spark plug 4 as shown by the arrow in FIG.
It will be ignited by.

As mentioned above, this idea makes the internal air-fuel mixture in the combustion chamber 5 uniform by squishing and swirling, thereby improving combustion efficiency, and even a thin air-fuel mixture can be combusted with high efficiency. It has the effect of reducing abnormal noise.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a typical cylinder head.
Fig. 2 is a bottom view of the cylinder head of this invention seen from below, Fig. 3 is a sectional view taken along the - line in Fig. 2, Fig. 4 is a sectional view taken along the - line in Fig. 2, and Fig. 5 is a sectional view taken along the - line in Fig. 2. A sectional view taken along the - line in FIG.
Figure 6 is a sectional view taken along the - line in Figure 2;
The figure is a sectional view taken along the - line in FIG. 2, FIG. 8 is a sectional view taken along the - line in FIG. 2, and FIG. 9 is an explanatory diagram of the operation. 1...Cylinder head, 2...Cylinder, 4...
...Spark plug, 5...Combustion chamber, 6...Groove.

Claims (1)

[Scope of utility model registration request] The spark plug is installed in the center of the cylinder head that forms the upper wall of the combustion chamber, and the spark plug part is deep inside the cylinder head, and from that part it goes toward the intake port of the combustion chamber. The grooves are symmetrical in shape and branch away from each other, gradually becoming shallower and narrower along the wall of the combustion chamber toward the exhaust port, forming grooves that connect from both sides. Cycle engine cylinder head.