CN201246211Y

CN201246211Y - Motorcycle engine combustion chamber

Info

Publication number: CN201246211Y
Application number: CNU2008200998018U
Authority: CN
Inventors: 李兴胜; 罗前刚
Original assignee: Chongqing Zongshen Engine Manufacturing Co Ltd
Current assignee: Chongqing Zongshen Engine Manufacturing Co Ltd
Priority date: 2008-08-27
Filing date: 2008-08-27
Publication date: 2009-05-27
Anticipated expiration: 2018-08-27

Abstract

The utility model discloses a motorcycle engine combustion chamber which comprises a space curved surface of the lower bottom surface of a cylinder cap, an air inlet opening and an air outlet opening are formed on the space curved surface, the space curved surface is formed by crossing of an air inlet spherical surface and an air exhausting spherical surface in different sizes, an arc surface transition is adopted at the junction, two extrude faces are formed by the crossing of the space curved surface and an anomalous foul line, the two extrude faces are in different sizes and are respectively positioned on the two sides of a line of centers of the air inlet opening and the air outlet opening. During the engine intake process, the air pressure in the position of the extrude faces is higher than that in other positions of the combustion chamber, so that the air is caused to produce vortices. Meanwhile, the sizes of the two compressive planes are different, and the pressure in the position of the larger extrude face is higher than the pressure in the position of the smaller extrude face, the pressure difference ensures that the vortices is produced more fiercely, the petrol and the air are mixed more sufficiently, and meanwhile, petrol particles are refined. Therefore, the petrol burning is more sufficient, the combustion efficiency is enhanced, and the dynamic property of the engine is improved, and the emission is reduced.

Description

A kind of motorcycle engine combustion chamber

Technical field

The utility model relates to a kind of improved motorcycle engine combustion chamber, belongs to machinery manufacturing technology field.

Background technique

Engine chamber is the significant points of motor, and whether it is related to oily vapour and mixes fully and the efficient of burning, is one of principal element that influences engine power performance.The combustion efficiency of fuel is high more, and the conversion efficiency of energy is just high more, and the power character of motor is just good more.In addition, the combustion efficiency of fuel is also very big to the engine exhaust emission influence, and combustion efficiency is high more, and the toxic emission after the fuel combustion is just few more.Usually engine chamber is to be made of jointly the pit of cylinder head bottom surface and the piston sleeve cavity on the piston top that is attached thereto.In the existing firing chamber, the pit of cylinder head bottom surface is a spherical crown shape structure, the profile line that pit and cylinder head bottom surface intersect is circle, this circle and piston cross section are big or small consistent and over against piston, pit is provided with the inlet and outlet mouth, the inlet and outlet mouth line of centres is the center line of circle, as shown in Figure 1 and Figure 2.The crown pit of cylinder head bottom surface of existing structure is rule comparatively, therefore the pressure that enters its interior fuel oil and air is comparatively average, can not get sufficient mixing, makes the gasoline particle refinement not form bigger particle, cause and fully to burn, thereby influence the power and the discharging of motor.

For the combustion efficiency and the power character that improve motor, those skilled in the art have carried out continuous improvement to existing hemispherical combustion chamber.Such as China Patent No. is ZL200520033025.8, invention and created name discloses a kind of improved engine chamber for the patent of " a kind of motorcycle engine combustion chamber ", firing chamber on the described cylinder head is the bath-tub type shape, be provided with two compressive planes on the face of firing chamber with respect to spark plug side and offside, compressive plane is positioned on the basin edge of bathtub.Compare traditional hemispherical combustion chamber, such scheme can form the squish turbulent flow, accelerates velocity of propagation of flame, improves combustion efficiency, is improving power character, reduces oil consumption and is discharging progressive to some extent.But the still comparatively regular and symmetry of the bags still can not make fuel oil and air be mixed fully.

The model utility content

At the prior art above shortcomings, the purpose of this utility model provides a kind of fuel oil and gas of making and produces the strong eddy current of lateral flow formation, improves the motorcycle engine combustion chamber of engine combustion efficiency and power character.

The technical solution of the utility model is achieved in that a kind of motorcycle engine combustion chamber, comprise cylinder head bottom surface space curved surface, this space curved surface is provided with suction port and relief opening, it is characterized in that: described space curved surface is formed by air inlet sphere that varies in size and exhaust spheres intersect, the arc surface transition is adopted in the intersection, suction port is located on the air inlet sphere, and relief opening is located on the exhaust sphere; Described space curved surface and special-shaped border are intersected and are formed two compressive planes, and two compressive planes are not of uniform size and lay respectively at the both sides of the suction port and the relief opening line of centres.

The line of centres of described suction port and relief opening departs from the piston sleeve center line and is partial to less compressive plane.

The utility model forms two place's compressive planes, and in engine intake process, the air pressure at compressive plane place is greater than other local air pressure of combustion chamber, so gas flow is subjected to the influence of different pressures difference and produces lateral flow in the firing chamber, thereby makes gas produce eddy current.Simultaneously because two place's compressive planes are not of uniform size, the big local pressure of compressive plane is greater than the little local pressure of compressive plane, this pressure official post eddy current produces stronger, gasoline and air mixing are more abundant, gasoline particle refinement in mixed process simultaneously, gasoline combustion is more abundant, has improved combustion efficiency, has improved the power character of motor and has reduced discharging.

Description of drawings

Fig. 1-existing engine combustion chamber shape schematic representation;

The A-A sectional view of Fig. 2-Fig. 1;

Fig. 3-the utility model engine combustion chamber shape schematic representation;

Fig. 4-compressive plane pressurized schematic representation.

Embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Referring to Fig. 3 and Fig. 4, as can be seen, motorcycle engine combustion chamber of the present utility model comprises the space curved surface 2 of cylinder head 1 bottom surface from the figure, and this space curved surface 2 is provided with suction port 3 and relief opening 4.Described space curved surface 2 adopts special-shaped shaped design, its sectional shape is seen Fig. 3, and space curved surface 2 is formed by air inlet sphere that varies in size and exhaust spheres intersect, and the arc surface transition is adopted in the intersection, suction port 3 is located on the air inlet sphere, and relief opening 4 is located on the exhaust sphere.Intersect on described space curved surface and special-shaped border and to form two compressive planes, 5, two compressive planes 5 not of uniform size and lay respectively at the both sides of the suction port 3 and relief opening 4 lines of centres.

Further, the line of centres of described suction port 3 and relief opening 4 departs from the piston sleeve center line and is partial to less compressive plane 5, sees Fig. 3, even combustion chamber is asymmetric like this, the line of centres of intake valve and exhaust valve also roughly on the center line of combustion chamber, helps the inlet and outlet process.

Arrow is represented gas flow direction among Fig. 4, and mark 6 is a cylinder, and mark 7 is a piston.

Its everywhere pressure be analyzed as follows: establishing Pi is suction port pressure, and Po is an exhaust port pressure, and P1 is big compressive plane place pressure, and P2 is a less compressive plane place pressure.In engine intake process, the air pressure at compressive plane place is greater than other local air pressure of combustion chamber, so gas flow is subjected to the influence of different pressures difference and produces lateral flow in the firing chamber, thereby makes gas produce eddy current.Simultaneously because two place's compressive planes are not of uniform size, the big local pressure of compressive plane is greater than the little local pressure of compressive plane, this pressure official post eddy current produces stronger, gasoline and air mixing are more abundant, gasoline particle refinement in mixed process simultaneously, gasoline combustion is more abundant, has improved combustion efficiency, has improved the power character of motor and has reduced discharging.

In addition, the utility model Combustion chamber design, in scavenging process, exhaust port pressure Po is all less than suction port pressure P i and P1, P2, waste gas in the firing chamber is subjected to the influence of this pressure, enters relief opening rapidly and discharges, and makes the motor scavenging process more thorough, help improving the motor charging efficiency, thereby improve engine power performance.

Claims

1, a kind of motorcycle engine combustion chamber, comprise cylinder head bottom surface space curved surface (2), this space curved surface is provided with suction port (3) and relief opening (4), it is characterized in that: described space curved surface is formed by air inlet sphere that varies in size and exhaust spheres intersect, the arc surface transition is adopted in the intersection, suction port (3) is located on the air inlet sphere, and relief opening (4) is located on the exhaust sphere; Described space curved surface and special-shaped border are intersected and are formed two compressive planes, and two compressive planes (5) are not of uniform size and lay respectively at the both sides of the suction port (3) and relief opening (4) line of centres.

2, motorcycle engine combustion chamber according to claim 1 is characterized in that: the line of centres of described suction port (3) and relief opening (4) departs from the piston sleeve center line and is partial to less compressive plane.