CN201078281Y - Supercharged diesel piston combustion chamber with low emission - Google Patents

Abstract

The utility model relates to a low emission pressurized diesel engine piston combustion chamber, which is an Omega-shaped combustion chamber on a top of the piston with the diameter between Phi 94mm to Phi 97mm. The diameter A of the Omega -shaped combustion chamber is between Phi 54mm to Phi 56mm, the diameter B of a throat opening is between Phi 46mm to Phi 48mm, the depth C is between 17mm to 19mm, the arc semidiameter D at the bottom is R7mm to 8mm, the diameter E of a central boss panel is Phi 9mm to Phi 11mm, the depth F from the central boss panel to the top of the combustion chamber is between 4.5mm to 7.5mm, a bevel cone angle Alpha of the boss is 23 degrees to 28 degrees, a transitional round angle of the bevel and an arc surface at the bottom H is R1mm to 3mm and the transitional round angle of the throat opening part and the arc surface at the bottom I is R1mm to 3mm. The utility model has the advantages that the design is reasonable, the ideal oil-gas mixing effect by using the air in the combustion chamber in the largest range and the requirement of high performance of the pressurized diesel engine.

Description

Low emission supercharged diesel engine piston combustion bowl

Technical field

The utility model relates to the diesel engine piston firing chamber of a kind of cylinder diameter at 94-97mm, especially relates to a kind of low emission supercharged diesel engine piston combustion bowl.

Background technique

At present, in the little cylinder diameter supercharging direct injection diesel engine that China produces, use relatively extensively the ω firing chamber of piston head.The structure of this firing chamber, shape, size and the position of piston head to cylinder in air motion and oil gas mix bigger influence all arranged, thereby directly have influence on the combustion performance of diesel engine.The firing chamber of the existing supercharging diesel engine with direct injection directly mouthful toroidal combustion chamber that adopt more, when entering cylinder by intake duct, air produces the intake swirl that rotates around cylinder-bore axis, and compressing latter stage, the air of the annular space on piston head top is clamp-oned to produce in the firing chamber and is squeezed stream, to help fuel and Air mixing.But because the oral area of firing chamber is straight mouth structure, quench area is less, therefore can not form enough crowded stream, so air utilization ratio is on the low side, cause fuel and Air mixing effect to reduce, can't form desirable inflammable mixture, it is insufficient to burn, and causes emission performance can't reach environmental requirement.At the problems referred to above, it is closing in toroidal combustion chamber that a kind of piston combustion bowl is arranged at present, the straight mouthful toroidal combustion chamber in this firing chamber can increase the crowded stream effect of firing chamber, to improve the utilization ratio of air, but because the footpath of firing chamber is dark in less mostly, well balance quality and discharge between relation.

Summary of the invention

It is a kind of reasonable in design that the purpose of this utility model is to provide, and can farthest utilize air in the firing chamber to reach desirable oil gas mixed effect, satisfies the high performance low emission supercharged diesel engine of diesel engine piston combustion bowl.

The utility model is that the technological scheme that achieves the above object is: a kind of low emission supercharged diesel engine piston combustion bowl, comprise the ω shape firing chamber of diameter at the piston head of φ 94-φ 97mm, it is characterized in that: the diameter A of described ω shape firing chamber is at φ 54-φ 56mm, throat diameter B is at φ 46-φ 48mm, degree of depth C is at 17-19mm, bottom radius of arc D is at R7-8mm, middle part boss planar diameter E is at φ 9-φ 11mm, boss plane, middle part from the degree of depth F of top of combustion chamber at 4.5-7.5mm, boss inclined-plane cone angle is at 23 °-28 °, the knuckle G of inclined-plane and bottom arc surface is at R0.5-2mm, the knuckle H of aditus laryngis part and end face is at R1-3mm, and the knuckle I of aditus laryngis part and bottom arc surface is at R1-3mm.

The utility model is by the analysis to diesel engine air inlet system, fuel injection characteristic and cylinder head general arrangement, reasonable Arrangement piston head ω shape combustion-chamber shape and size, reduce firing chamber diameter and throat diameter, increased distance and the middle part boss inclined-plane cone angle of middle part boss face to piston head, the air of the annular space on piston head top can produce stronger squish eddy current in clamp-oning the firing chamber, intake swirl and squish eddy current can well be cooperatively interacted, thereby improve the mixing of oil gas.Simultaneously by adjusting oil sprayer in the cylinder covering position, make oil bundle and combustion-chamber shape coupling, the space distribution in the firing chamber is more reasonable, and it is desirable more that oil gas is mixed, simultaneously air utilization ratio is improved, thereby has reached desirable high-performance, the index of low emission.Adopt the firing chamber of the utility model structure, can make the diesel exhaust gas pollutant emission reach European II standard, fuel-economizing simultaneously has good social benefit and economic benefit.

Description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Fig. 1 is the structural representation of the utility model piston head.

Fig. 2 is that cuing open of Fig. 1 shown structural representation.

Embodiment

See low emission supercharged diesel engine piston combustion bowl of the present utility model shown in Fig. 1,2, it is the ω shape firing chamber 2 that is positioned at piston 1 top, this piston 1 diameter is at φ 94-φ 97mm, ω shape firing chamber 2 by changing piston 1 top is in position of piston, making 2 central positions, ω shape firing chamber is 4.5-7.5mm with respect to the fore-and-aft distance Y at piston 1 center, is 1-2mm with respect to the lateral separation X at piston 1 center.The utility model redesigns the geomery of ω shape firing chamber 2, and ω shape firing chamber 2 can maximally utilise the air that enters piston head, makes diesel engine have best oil gas mixing ratio.See as shown in Figure 2, the diameter A of the utility model ω shape firing chamber 2 is at 54-φ 56mm, throat diameter B is at φ 46-φ 48mm, combustion-chamber depth C is at 17-19mm, bottom radius of arc D is at R7-8mm, middle part boss planar diameter E is at φ 9-φ 11mm, boss plane, middle part from the degree of depth F of top of combustion chamber at 4.5-6.5mm, boss inclined-plane cone angle is at 23 °-28 °, at R1-35mm, the knuckle I of aditus laryngis part and bottom arc surface is at R1-3mm at the knuckle H of R0.5-2mm aditus laryngis part and end face for the knuckle G of inclined-plane and bottom arc surface.

Claims (2)

1. low emission supercharged diesel engine piston combustion bowl, be the ω shape firing chamber (2) of diameter at φ 94-φ 97mm piston (1) top, it is characterized in that: the diameter A of described ω shape firing chamber (2) is at φ 54-φ 56mm, throat diameter B is at φ 46-φ 48mm, degree of depth C is at 17-19mm, bottom radius of arc D is at R7-8mm, middle part boss planar diameter E is at φ 9-φ 11mm, boss plane, middle part from the degree of depth F of top of combustion chamber at 4.5-7.5mm, boss inclined-plane cone angle is at 23 °-28 °, the knuckle G of inclined-plane and bottom arc surface is at R0.5-2mm, the knuckle H of aditus laryngis part and end face is at R1-3mm, and the knuckle I of aditus laryngis part and bottom arc surface is at R1-3mm.

2. low emission supercharged diesel engine piston combustion bowl according to claim 1 is characterized in that: the fore-and-aft distance Y of the center line of described ω shape firing chamber (2) and piston (1) axis is at 4.5-7.5mm, with the lateral separation X of piston (1) center line at 1-2mm.

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