CN101382097A - Piston for IC engine - Google Patents

Abstract

The invention provides a piston of a combustion engine, which comprises pits (2) of a combustion chamber of the head of the piston, a piston skirt portion (4) and a piston pin hole (7), a semicircular collision-preventing groove (5), a piston annular groove (6) and an oil return hole (8). The piston of the combustion engine is characterized in that the pits (2) of the combustion chamber of the head of the piston of the engine form an ellipse track (1). The piston achieves an aim of increasing mixture of oil and gas by changing the shape of the head of the piston, oil-gas mixture entering from an air flue to the combustion chamber passes through the ellipse pits of the head of the piston to change motion direction of air current through the ellipse combustion chamber of the head of the piston so as to well form a vortex motion, increase even mixture of oil and gas and contribute to sufficient combustion of the oil-gas mixture, thereby being capable of excellently utilizing the fuel, and reducing emission of harmful matters and consumption of the fuel.

Description

A kind of internal combustion engine

Technical field

The present invention relates to the motor car engine field, especially relate to a kind of internal combustion engine piston.

Background technique

Along with developing of automobile industry, the requirement of automobile fuel consumption, discharging constantly to be improved, 2008 Beijing come into effect state IV emission standard.Simultaneously, because world energy sources is in short supply, reduction fuel oil consumption, engine oil consumption, raising exhaust emission standard are the trend of following internal combustion engine development.Piston is motor important composition parts, and its working environment and abominable.Piston is various informative, but its thick-and-thin aim reduces piston mass, improves the life-span, reduces the tail gas hazardous emission, reduces the fuel oil consumption.

Float petrol machine piston mainly is based on flat-top in the market, this kind structure of piston is simple, but the moving direction that this structure can not fine change enters the gas mixture of firing chamber, can not make gas mixture form eddy motion well, and then cause oil gas undercompounding, it is not thorough to burn.

Summary of the invention

The present invention has designed a kind of internal combustion engine, and purpose is to solve the oil gas undercompounding that enters in the firing chamber, is unfavorable for burning, and then causes NO _xProblems such as, oil consumption height higher Deng noxious gas emission.

In order to solve the technical problem of above-mentioned existence, the present invention has adopted following scheme:

A kind of internal combustion engine comprises piston crown combustion recess (2), piston skirt (4) and piston pin hole (7), semicircle collision prevention groove (5), piston ring groove (6), spill port (8).Described engine piston head combustion recess (2) ovalisation track (1), the mathematical model of described elliptical path (1) is: $\frac{x^2}{470.89}+\frac{{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="A200810171545E00062.png"\; state="\{\{state\}\}">y</figure-callout>}}^2}{640.09}=1,$ Wherein x is oval-shaped major axis (mm); Y is oval-shaped minor axis (mm).

The knuckle (3) of described piston crown combustion recess (2) carries out the transition to the R10 degree by the R17.5 degree.

The material that described piston is selected for use is cast aluminium alloy ZL109.

This internal combustion engine compared with prior art, have following beneficial effect: the present invention utilizes the shape that changes piston crown to strengthen the purpose that oil gas mixes to reach, by the oval-shaped firing chamber of piston crown, make from air flue and enter the moving direction of the gas mixture of firing chamber through piston crown oblong pits change air-flow, and then well formed eddy motion, having strengthened oil gas mixes, helping gas mixture fully burns, so can utilize fuel oil well, reduce discharging, the reduction fuel consume of harmful substance.

Description of drawings

Fig. 1: the plan view of internal combustion engine of the present invention;

Fig. 2: the structural representation of internal combustion engine of the present invention.

Description of reference numerals:

1-elliptical path; 2-piston crown combustion recess; The 3-knuckle; The 4-piston skirt; The semicircle collision prevention groove of 5-; The 6-piston ring groove; The 7-piston pin hole; The 8-spill port.

Embodiment

Below in conjunction with Fig. 1 and Fig. 2, the present invention will be further described:

A kind of internal combustion engine, comprise piston crown combustion recess 2, piston skirt 4 and piston pin hole 7, semicircle collision prevention groove 5, piston ring groove 6, spill port 8 is characterized in that, described engine piston head combustion recess 2 ovalisation tracks 1, the mathematical model of described elliptical path 1 is: $\frac{x^2}{470.89}+\frac{{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="A200810171545E00062.png"\; state="\{\{state\}\}">y</figure-callout>}}^2}{640.09}=1,$ Wherein x is oval-shaped long axis length mm; Y is oval-shaped minor axis length mm.

Described piston crown combustion recess 2 knuckles 3 carry out the transition to the R10 degree by the R17.5 degree.

The material that described piston is selected for use is cast aluminium alloy ZL109.

Preferred, described internal combustion engine comprises elliptical orbit 1, and wherein minor axis is 43.4mm, major axis 50.6mm, and pit depth 2 is 6.5mm.

The piston crown firing chamber of level and smooth arc-shaped transition can change the direction of the gas mixture air-flow that enters the firing chamber glibly, gas mixture is rotated in the firing chamber form eddy current, fully mixed oil and gas.

Claims (3)

1, a kind of internal combustion engine, comprise piston crown combustion recess (2), piston skirt (4) and piston pin hole (7), semicircle collision prevention groove (5), piston ring groove (6), spill port (8), it is characterized in that, described engine piston head combustion recess (2) ovalisation track (1), the mathematical model of described elliptical path (1) is: $\frac{x^2}{470.89}+\frac{y^2}{640.09}=1,$ Wherein x is oval-shaped long axis length (mm); Y is oval-shaped minor axis length (mm).

According to the described internal combustion engine of claim 1, it is characterized in that 2, described piston crown combustion recess (2) knuckle (3) carries out the transition to the R10 degree by the R17.5 degree.

According to claim 1 or 2 described internal combustion engines, it is characterized in that 3, the material that described piston is selected for use is cast aluminium alloy ZL109.

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