CN2184789Y

CN2184789Y - Self-made tangential eddy-current combustion cavity for internal combustion engine

Info

Publication number: CN2184789Y
Application number: CN 94202170
Authority: CN
Inventors: 陈燕; 阮振伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-01-29
Filing date: 1994-01-29
Publication date: 1994-12-07
Anticipated expiration: 2004-01-29

Abstract

The utility model relates to a self-made tangential eddy-current combustion chamber of an internal combustion engine. The lower surface of a cylinder head (1) is provided with a boss (2) whose shape is matched with that of a concave pit throat opening (8) of a piston, so that space inside a cylinder is divided into two parts before and after the top dead center of compression; the piston (6) is provided with a plurality of a small path (9) for communicating the two parts, and the movement of the piston and combustion causes gas in the small path (9) to flow at high speed; the small path (9) is arranged in circumferential direction, so that the flow has greater tangential divided speed, and drives other fluid to form a tangential eddy-current by matching with the wall surface of the combustion chamber. The combustion chamber can improve the economy of internal combustion engines, reduces noxious exhaust, lowers vibration and noise, and improves reliability.

Description

Self-made tangential eddy-current combustion cavity for internal combustion engine

The utility model relates to the combustion in IC engine technology, particularly relates to the firing chamber of diesel engine with direct injection.

Direct injection combustion chamber is miniature high-speed diesel engine the most a kind of firing chamber of extensive employing, is made of piston, cylinder cap and cylinder sleeve three parts.In the prior art, most small DI diesel engine all are provided with the intake duct of special shape in cylinder cap, form tangential eddy current in the cylinder when making air enter cylinder, accelerate the speed of fuel and air mixing and burning.But, utilize intake process to produce tangential eddy current, cause the inlet stream dynamic resistance big, the Maximum Torque of internal combustion function output and peak output are descended.Simultaneously, because of complex-shaped vortex air intake road is set on the cylinder cap, to design, the manufacturing requirement raising of cylinder cap, the corresponding cost that increased, the reliability of reduction motor.In addition, in combustion process of the internal-combustion engine, the tangential eddy current of air inlet is decayed in time, is difficult to satisfy main combustion period and after burning period burning to the demand of air flows, makes the fuel heat cracking and burns incomplete.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and a kind of improved combustion chambers of internal combustion engines is provided.Produce tangential eddy current by firing chamber itself, and make the tangential eddy current that obtains be more suitable for the in-cylinder combustion process, thereby improve the combination property of miniature high-speed diesel engine comprehensively.

The purpose of this utility model can reach by following measure: design a kind of internal-combustion engine from making tangential turbulence chamber, comprise cylinder cap, cylinder sleeve and piston, piston head has the pit firing chamber, at the cylinder cap lower surface boss that one shape and piston crater aditus laryngis are complementary is set; The inclination small channel that is communicated with pit firing chamber and piston-top surface space is arranged in the piston, and perforated plate type atomizer is arranged on the boss.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the local longitudinal sectional view of the internal-combustion engine of a most preferred embodiment of the utility model.

Fig. 2 is the plan view of same embodiment's piston.

Be described in further detail with regard to the most preferred embodiment shown in the accompanying drawing below.

It is of the present utility model that making tangential turbulence chamber comprises cylinder cap 1, cylinder sleeve 5 and piston 6 certainly, pit firing chamber 7 is arranged at piston 6 tops, at cylinder cap 1 lower surface the boss 2 that one shape and piston crater aditus laryngis 8 are complementary is set, select suitable boss 2 height, make before and after compression top center, be total in about 10 °～28 ° scope before and after the corresponding crank angle, boss 2 puts in the piston crater aditus laryngis 8, and the space is separated into by boss 2 and reaches two-part in the piston crater 7 on the relatively independent piston head in the cylinder.

Some for example four inclination small channels 9 that are communicated with pit firing chamber 7 and piston 6 end face spaces are arranged in the piston 6, small channel 9 layout in a circumferential direction will guarantee that it is on the tangent direction of circle in the center of circle, as shown in Figure 2 that small channel 9 is positioned at pit 7 center lines at the center line of pit 7 inner outlet ends.Determine the tilt angle of small channel 9 and, consider two factors: 1. flow to piston 6 top and go up the part in space and do not fire fuel oil energy and make full use of air burning near cylinder sleeve 5 one sides by small channel 9 in the position of piston 6 top upper outlet ends; 2. the air-flow by small channel 9 can produce stronger tangential eddy current in the space on the top of piston 6.

Perforated plate type atomizer 3 is arranged on the boss 2, and spray orifice is facing to the outlet end of small channel 9 in piston crater 7.

Firing chamber of the present utility model is before the burning beginning, utilize piston 6 motions to produce pressure difference and form tangential eddy current, add after the burning beginning that the pressure difference of utilizing burning to produce strengthens tangential eddy current, burning beginning in piston crater 7 earlier, then utilize the tangential eddy current and the stronger turbulent perturbation of near the fair speed of small channel 9 outlets in the pit 7, accelerate fuel and Air mixing, promote burning and guarantee that a part of fuel can arrive piston 6 tops rapidly by small channel 9 and go up the space, make full use of this place fresh air comparatively more than needed and burn.

Compare with prior art, the utility model has the advantage of the internal combustion engine economy is improved, mechanical efficiency improves, and indicated thermal efficiency improves, and black smoke and NO discharging reduce, and vibration, noise descend, Reliability Enhancement, and cost descends, and the variable speed performance of operating condition matches.

Claims

1, a kind of internal-combustion engine comprises cylinder cap (1), cylinder sleeve (5) and piston (6) from making tangential turbulence chamber, and pit firing chamber (7) is arranged at piston (6) top; It is characterized in that: the boss (2) that one shape and piston crater aditus laryngis (8) are complementary is set at cylinder cap (1) lower surface; The inclination small channel (9) that is communicated with pit firing chamber (7) and piston (6) end face space is arranged in the piston; Perforated plate type atomizer (3) is arranged on the boss (2).

2, internal-combustion engine according to claim 1 is from making tangential turbulence chamber, it is characterized in that: the height of selecting suitable boss (2), make before and after compression top center, the interior space of scope inner casing about 10 °～28 ° altogether before and after the corresponding crank angle is separated into two-part by boss (2).

3, internal-combustion engine according to claim 1 is characterized in that from making tangential turbulence chamber: small channel (9) layout in a circumferential direction will guarantee that it is on the tangent direction of circle in the center of circle that small channel (9) is positioned at pit (7) center line at the center line of pit (7) inner outlet end.

4, internal-combustion engine according to claim 1 is characterized in that from making tangential turbulence chamber: the spray orifice of perforated plate type atomizer (3) is facing to the outlet end of small channel (9) in piston crater (7).