阅读说明：本技术 一种包含偏轴心型主动式预燃室的汽油机点火机构 (Gasoline engine ignition mechanism containing eccentric axis type active precombustion chamber ) 是由 安彦召 赵德阳 裴毅强 陈涛 张帆 秦静 于 2021-08-18 设计创作，主要内容包括：本发明涉及一种包含偏轴心型主动式预燃室的汽油机点火机构。汽油机点火机构包括：圆柱状的连接件,贯穿连接件上端面和下端面的喷油器安装孔,贯穿连接件上端面和下端面的火花塞安装孔,通过螺纹与连接件外周面相连接的预燃室,与喷油器安装孔配合工作的预燃室喷油器,与火花塞安装孔配合工作的预燃室火花塞；本发明中,预燃室的点火位置居中,进而使火焰面更对称地向各个预燃室射流喷孔发展,缩短火焰面到达各个预燃室射流喷孔的时间差,减弱各预燃室射流喷孔射流时刻的不对称情况。(The invention relates to a gasoline engine ignition mechanism comprising an off-axis center type active precombustion chamber. The ignition mechanism of the gasoline engine comprises: the fuel injector comprises a cylindrical connecting piece, fuel injector mounting holes penetrating through the upper end face and the lower end face of the connecting piece, spark plug mounting holes penetrating through the upper end face and the lower end face of the connecting piece, a pre-combustion chamber connected with the peripheral face of the connecting piece through threads, a pre-combustion chamber fuel injector working in cooperation with the fuel injector mounting holes, and a pre-combustion chamber spark plug working in cooperation with the spark plug mounting holes; in the invention, the ignition position of the precombustion chamber is centered, so that the flame surface develops to each precombustion chamber jet orifice more symmetrically, the time difference of the flame surface reaching each precombustion chamber jet orifice is shortened, and the asymmetry condition of the jet time of each precombustion chamber jet orifice is weakened.)

1. An ignition mechanism for a gasoline engine including an off-axis active prechamber, comprising: the fuel injector comprises a cylindrical connecting piece (1), fuel injector mounting holes penetrating through the upper end face and the lower end face of the connecting piece, spark plug mounting holes penetrating through the upper end face and the lower end face of the connecting piece, a precombustion chamber (5) connected with the peripheral surface of the connecting piece through threads, a precombustion chamber fuel injector (4) working in cooperation with the fuel injector mounting holes, and a precombustion chamber spark plug (2) working in cooperation with the spark plug mounting holes;

the precombustion chamber is formed by combining three sections, namely a first cylindrical sleeve body (10), an eccentric conical sleeve body (11) and a second cylindrical cavity body (12) from top to bottom in sequence, wherein the inner diameter of the first cylindrical sleeve body is fixedly connected with the outer circumferential surface of the connecting piece through threads, the inner diameter of the second cylindrical cavity body is smaller than that of the first cylindrical sleeve body, and the second cylindrical cavity body is not overlapped with the central line of the first cylindrical cavity body; the eccentric conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity; the lower end surface of the connecting piece, the inner wall of the conical sleeve body and the inner wall of the second cylindrical cavity enclose to form a pre-combustion chamber;

the lower part of the second cylindrical cavity is provided with N spray holes (8), wherein N is an integer greater than or equal to 3;

the central line of the oil sprayer mounting hole is vertical to the upper end surface and the lower end surface of the connecting piece; the center line of the spark plug mounting hole and the axis of the second cylindrical cavity intersect at the pre-chamber spark plug electrode.

2. The ignition mechanism of a gasoline engine comprising an off-axis active pre-chamber as claimed in claim 1, wherein the nozzle is located at the intersection of the bottom surface and the circumferential surface of the second cylindrical cavity.

The technical field is as follows:

the invention relates to an ignition mechanism of an internal combustion engine, in particular to an ignition mechanism of a gasoline engine comprising an eccentric active precombustion chamber.

Background art:

the active precombustion chamber engine adopts a lean combustion technology to improve the thermal efficiency of the engine, the conditions of fire breaking and the like are easily generated under the condition that the mixed gas in an engine cylinder is over lean, and the conditions of detonation and the like are more easily generated when the local flame is slowly spread, so that the jet flame can be ignited by utilizing the active precombustion chamber, a plurality of ignition points are formed in the main combustion chamber, and the combustion of the lean mixed gas is ensured.

Due to the size limitation of the precombustion chamber suitable for the gasoline engine, the size of the active precombustion chamber in the engine is generally small, the arrangement of the internal fuel injector and the spark plug is compact, the ignition position of the spark plug cannot be centered in the center of the precombustion chamber, flame in the precombustion chamber cannot be diffused to the periphery from the center position, and then the flame surface cannot be simultaneously spread to all spray holes, so that the asymmetric condition of the spray hole jet flow time is caused.

The invention content is as follows:

the invention aims to provide a gasoline engine ignition mechanism comprising an eccentric axis type active precombustion chamber, which solves the problem that flame in the precombustion chamber cannot spread from the central position to the periphery. In order to achieve the purpose, the invention provides the following technical scheme:

an ignition mechanism for a gasoline engine including an off-axis active prechamber, comprising: the fuel injector comprises a cylindrical connecting piece 1, fuel injector mounting holes penetrating through the upper end face and the lower end face of the connecting piece, spark plug mounting holes penetrating through the upper end face and the lower end face of the connecting piece, a prechamber 5 connected with the peripheral face of the connecting piece through threads, a prechamber fuel injector 4 matched with the fuel injector mounting holes to work, and a prechamber spark plug 2 matched with the spark plug mounting holes to work;

the precombustion chamber is formed by combining three sections, namely a first cylindrical sleeve body 10, an eccentric conical sleeve body 11 and a second cylindrical cavity body 12 from top to bottom in sequence, wherein the inner diameter of the first cylindrical sleeve body is fixedly connected with the outer circumferential surface of the connecting piece through threads, the inner diameter of the second cylindrical cavity body is smaller than that of the first cylindrical sleeve body, and the second cylindrical cavity body is not overlapped with the central line of the first cylindrical cavity body; the eccentric conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity; the lower end surface of the connecting piece, the inner wall of the eccentric conical sleeve body and the inner wall of the second cylindrical cavity enclose to form a pre-combustion chamber;

the lower part of the second cylindrical cavity is provided with N precombustion chamber jet flow spray holes 8, and N is an integer greater than or equal to 3;

the central line of the oil sprayer mounting hole is vertical to the upper end surface and the lower end surface of the connecting piece; the center line of the spark plug mounting hole and the axis of the second cylindrical cavity intersect at the pre-chamber spark plug electrode.

Preferably, the jet nozzle of the precombustion chamber is located at the junction of the bottom surface and the circumferential surface of the second cylindrical cavity.

According to the invention, the spark plug is positioned on the central line of the second cylindrical cavity, namely the axial line of the precombustion chamber, so that the ignition position of the precombustion chamber is centered, the flame surface is further symmetrically developed towards each precombustion chamber jet orifice, the time difference of the flame surface reaching each precombustion chamber jet orifice is shortened, and the asymmetry condition of the jet time of each precombustion chamber jet orifice is weakened.

Description of the drawings:

FIG. 1 is a cross-sectional view of an ignition mechanism in an embodiment of the present invention taken along an axial direction; in the figure, 1 represents a connecting member, 2 represents a pre-chamber spark plug, 3 represents a pre-chamber spark plug gasket, 4 represents a pre-chamber fuel injector, 5 represents a pre-chamber, 6 represents a sealing gasket, 7 represents a pre-chamber spark plug electrode, 8 represents a pre-chamber jet nozzle hole, 9 represents an oil beam passage for pre-chamber fuel injection, 10 represents a first cylindrical sleeve body, 11 represents an eccentric conical sleeve body, 12 represents a second cylindrical cavity, 16 represents a connecting member center line, and 17 represents a center line of the pre-chamber.

FIG. 2 is a bottom view of the structure of FIG. 1; in the figure, 7 represents a pre-chamber spark plug electrode 8 represents a pre-chamber jet flow jet hole, and 9 represents an oil beam channel for oil injection in the pre-chamber; in the figure, the structure of the eccentric cone-shaped sleeve body is clear at a glance.

FIG. 3 is a schematic diagram showing the structure of the ignition mechanism of the present invention in cooperation with a cylinder in the embodiment; in the figure, 5 represents the prechamber, 13 represents the main combustion chamber of the engine, 14 represents the engine cylinder, and 15 represents the engine piston.

The specific implementation mode is as follows:

example (b):

an ignition mechanism for a gasoline engine including an off-axis active prechamber, comprising: the device comprises a cylindrical connecting piece 1, an oil sprayer mounting hole penetrating through the upper end face and the lower end face of the connecting piece, a spark plug mounting hole penetrating through the upper end face and the lower end face of the connecting piece, a prechamber cavity 5 connected with the peripheral face of the connecting piece through threads, a prechamber oil sprayer 4 working in cooperation with the oil sprayer mounting hole, a prechamber spark plug 2 working in cooperation with the spark plug mounting hole, a spark plug gasket 3 and a sealing gasket 6;

the spark plug gasket realizes the sealing between the spark plug of the pre-combustion chamber and the connecting piece; the sealing gasket is made of red copper, so that the sealing between the connecting piece and the precombustion chamber is realized;

the precombustion chamber is formed by combining three sections, namely a first cylindrical sleeve body 10, an eccentric conical sleeve body 11 and a second cylindrical cavity body 12 from top to bottom in sequence, wherein the inner diameter of the first cylindrical sleeve body is fixedly connected with the outer circumferential surface of the connecting piece through threads, the inner diameter of the second cylindrical cavity body is smaller than that of the first cylindrical sleeve body, and the second cylindrical cavity body is not overlapped with the central line of the first cylindrical cavity body; the eccentric conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity; the lower end surface of the connecting piece, the inner wall of the eccentric conical sleeve body and the inner wall of the second cylindrical cavity enclose to form a pre-combustion chamber;

the jet flow spray holes of the precombustion chamber are positioned at the junction of the bottom surface and the circumferential surface of the second cylindrical cavity, and 6 jet flow spray holes are distributed in one circle.

The working process is as follows:

in the process of ascending of an engine piston 15 in a compression stroke, fresh charge in a main combustion chamber 13 of the engine enters a precombustion chamber 5 through a precombustion chamber jet flow spray hole 8, then an oil sprayer 4 of the precombustion chamber sprays oil, an oil beam reaches the combustion chamber of the precombustion chamber through an oil beam channel for spraying the oil in the precombustion chamber to be mixed with gas in the combustion chamber, combustible mixed gas mixed by gasoline and air is formed in the precombustion chamber, and then a spark plug 2 of the precombustion chamber ignites and ignites the mixed gas in the precombustion chamber;

the temperature and pressure in the precombustion chamber rise along with the combustion of the mixed gas, and when the pressure in the precombustion chamber is higher than that of the main combustion chamber 13 of the engine, the mixed gas in the precombustion chamber flows outwards through the jet flow jet holes 8 of the precombustion chamber to form jet flow; after ignition of the spark plug in the precombustion chamber, a flame surface taking the position of the spark plug electrode 7 as the center is formed, and the high-temperature flame surface gradually ignites the surrounding unburned mixed gas, namely the development of the flame surface.