CN2272055Y

CN2272055Y - Multiple flame high compression ratio gasoline gasoline engine

Info

Publication number: CN2272055Y
Application number: CN 95209791
Authority: CN
Inventors: 阮振伟; 陈燕
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-21
Filing date: 1995-04-21
Publication date: 1998-01-07
Anticipated expiration: 2005-04-21

Abstract

The utility model relates to a multipath flame spraying high compression ratio gasoline engine. When a piston runs to the vicinity of an upper dead center, a boss at the top of the piston is inserted in a throat opening of a main combustion chamber so that the space of the combustion chamber is provisionally divided into a main combustion chamber and an air extruding zone. The top of the piston is also provided with a plurality of flow guiding grooves which are communicated with the main combustion chamber and the air extruding zone. The utility model can effectively inhibit detonation to be suitable for higher compression ratio, moreover, the utility model can obviously reduce harmful discharge, and the operation of the gasoline engine is more stable and soft.

Description

Multichannel bright eruption type high compression ratio petrol engine

The utility model relates to the design of gasoline engine combustion chamber.

In order to improve petrolic Economy and power character, improving compression ratio is one of valid approach, but too high detonation, the soft property that causes engine knock and influence to be turned round of then causing easily of compression ratio.Wedge type, type of falling the basin and fire ball class firing chamber proportion in petrol engine are bigger, and they structurally have common feature: main combustion chamber is arranged in the cylinder head, and the bigger squish area of quench area is arranged between piston head plane and the cylinder head bottom plane.To this class firing chamber, in order to prevent detonation, existing structure is not being carried out under the condition of significant movement, people did some and improved design in recent years, made it adapt to higher compression ratio.A kind of compact rapid burning petrol engine is disclosed as Chinese patent specification 90109432.3, at piston top system one boss, the two is approaching mutually when piston walks to top dead center at recess of cylinder cap bottom system, make the passage attenuate between firing chamber and the air-cushion gap, reduce the interference of burnt gas, help suppressing detonation unburned mixture; But flame is propagated by spark plug and is arrived at the required time of terminal unburned mixture and prolong to some extent, makes terminal mixed gas before being lighted by propagating flame spontaneous combustion might take place, and the detonation tendency is increased, therefore should invention to suppress detonation not satisfactory.

The purpose of this utility model provides a kind of soft property that can suppress detonation better under high compression ratio, keep running, reduces the petrol engine of pollutant discharge amount.

To achieve these goals, on piston top one boss is set, in the time of near piston walks to top dead center, boss can embed the aditus laryngis of main combustion chamber, thereby be implemented in the provisional separation in the interior space of starting stage cylinder of burning, be separated into main combustion chamber part and the squish area part that contains the terminal mixed gas of easy detonation.Mixed gas in the main combustion chamber is at first by spark ignitor, but combustion gas are blocked by above-mentioned provisional separation the hyperthermia radiation heat transfer path of the terminal mixed gas of squish area, the temperature and pressure of terminal mixed gas does not obviously raise because of occurent burning in the main combustion chamber, prolong the setup time of spontaneous combustion, played the effect that suppresses detonation.Simultaneously, the guiding gutter of some connection main combustion chambers and squish area is set on the piston head surface, after the main combustion chamber internal pressure continues to improve a lot because of burning, gas is being carried flame secretly and is being sprayed into squish area at a high speed through guiding gutter in the main combustion chamber, flame is propagated by spark plug to be arrived at the required time of terminal mixed gas and shortens greatly, terminal mixed gas was promptly lighted before the generation spontaneous combustion, had suppressed the detonation tendency further.

Initiation combustion causes in the above technological scheme abrupt pressure raise only act on the corresponding part piston head of main combustion chamber aditus laryngis area on, it is not too fast that total downward thrust that piston is subjected to raises, the mechanical load that each movement parts of petrol engine and motion bearings are born and transmitted is not excessive, therefore can keep the soft property of petrol engine running.And, pressure before the inherent burning of cylinder in the main combustion chamber is lower than the pressure in the squish area, burning back main combustion chamber internal pressure then is higher than the squish area internal pressure, therefore, direction takes place and changes in the air-flow of the guiding gutter of flowing through before and after burning, can cause strong flow perturbation, help dispelling spark plug products of combustion on every side, the cooling spark plug helps reducing localized hyperthermia district in the cylinder, and burning is carried out at a high speed under strong turbulent flow.In the burning middle and later periods, separated by spaces provisional in the cylinder disappears, and residue is not fired premixed gas finish whole burning rapidly under high intensity turbulent, helps to reduce and does not fire HC, CO and NO _xDischarge amount.Again because the raising of compression ratio, the premixed gas that burning is rarer, the burning maximum temperature has a declining tendency, and oxygen is abundant, is difficult for partial combustion takes place, and also helps improving exhaust quality.

The height of piston head boss should guarantee piston motion to the top dead center be before and after the symmetric points in totally 10 °～30 ° crank angle range the time boss can both embed in the main combustion chamber aditus laryngis, making to have in guiding gutter between main combustion chamber and the squish area does not have gas flow again the gas flow.The degree of depth of guiding gutter is below 6mm, and the width summation is less than 25% of the boss girth.Explosive burning-point is pointed at an end of squish area in two ends of guiding gutter, the other end of boss then guiding gas in main combustion chamber, form desirable flowing, and spark plug and outlet valve etc. is located to carry out to a certain degree waste gas cleaning and cooling.

The utility model has three aspect beneficial effects; One, owing to can suppress detonation effectively, compression ratio can be higher, and thermal efficiency of cycle improves; And under temperature, pressure condition with higher, cyclical variations are suppressed, and mechanical efficiency improves.These reasons all make the Economy of petrol engine increase substantially.Two, because the existence of burning front and back high intensity turbulent disturbance and the realization of lean combustion, it is more complete to burn, and has reduced not fire HC, CO and NO _xDischarge amount, improved exhaust quality.Three, the abrupt pressure in initiation combustion stage raises and only acts on the part piston area, and the running of petrol engine is soft, and vibration and noise are less.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the longitudinal sectional drawing of falling the basin shaped combustion chamber.

Fig. 2 is Fig. 1 piston plan view, adds the projection position that is decorated with air valve and main combustion chamber aditus laryngis.

Fig. 3 is the longitudinal sectional drawing of fire ball class firing chamber.

Fig. 4 is the piston plan view of Fig. 3, adds the projection position that is decorated with air valve.

The prototype firing chamber of embodiment A is down basin shaped combustion chamber, expresses the shape and guiding gutter 7 shapes of piston head boss 4 in the embodiment A among Fig. 1, Fig. 2.The former firing chamber of Embodiment B is the fire ball class firing chamber, and its piston head boss 4 and guiding gutter 7 shapes are illustrated by Fig. 3, Fig. 4.Two embodiments have following difference: whole air valves of embodiment A are arranged on the main combustion chamber top, can only adopt two air valve structures to arrange that quench area is restricted, volumetric efficiency Less, high speed is just than Embodiment B difference, but spark plug and outlet valve can obtain the air inlet cooling, and the bigger main combustion chamber aditus laryngis of heat load can effectively be cooled off by the setting of cooling water channel.On the contrary, Embodiment B can adopt three air valves or four air valve structures, and quench area is bigger,

Higher, high speed is good, but the cooling raio at spark plug, outlet valve and main combustion chamber aditus laryngis place is difficult.

Claims

1. multichannel bright eruption type high compression ratio petrol engine, its firing chamber is surrounded by cylinder cap (1), piston (5), cylinder sleeve (6), and be divided into main combustion chamber (2) two-part space of establishing in squish area (8) and the cylinder cap (1), it is characterized in that: a boss (4) is arranged at piston (5) top, when piston (5) runs near the top dead center, boss (4) just embeds in the main combustion chamber aditus laryngis (3), and piston (5) top has guiding gutter (7) to be communicated with main combustion chamber (2) and squish area (8) simultaneously.

2. multichannel bright eruption type high compression ratio petrol engine according to claim 1 is characterized in that: when piston (5) runs to the top dead center is before and after the symmetric points in totally 10 °～30 ° crank angle range the time, and boss (4) is embedded in the main combustion chamber aditus laryngis (3).

3. multichannel bright eruption type high compression ratio petrol engine according to claim 1 and 2, it is characterized in that: guiding gutter (7) maximum depth is no more than 6 millimeters, and all guiding gutter width summation is less than 25% of boss (4) girth.