CN201206506Y - Piston combustion-chamber of second generation single cylinder diesel - Google Patents

Abstract

The utility model relates to a piston combustion chamber of a second-generation single-cylinder diesel, and belongs to the technical field of single-cylinder diesels. The piston combustion chamber comprises a combustion chamber at the top part of the piston, the diameter of the piston is phi 83 to phi 93 mm, symmetrical circular arc-shaped surfaces with intersected central lines are arranged at the bottom part of the combustion chamber, the radius of the circular arc is R5 to R7 mm, and the arc depth B is 14 to 17 mm; the inner tangent lines of the two circular arc-shaped surfaces are intersected to form conical surfaces, the smooth transition is adopted at the intersecting point of the conical surfaces, the included angle alpha between the outer tangent lines of the two circular arc-shaped surfaces and the center axle line of the piston is 18 to 25 degrees, the outer tangent lines of the two circular arcs extend towards the opening of the combustion chamber, the smooth transition is adopted at the opening part of the combustion chamber so as to form a throat opening part, the diameter H of the throat opening part is phi 42 to phi 47 mm, and the depth G thereof is 2.5 to 3.5 mm. The utility model has the advantages that the piston combustion chamber with reasonable design and good manufacturability can achieve ideal oil-gas mixing effect and meet the requirements of high performance and low emission of the single-cylinder diesel.

Description

The piston combustion bowl of second generation single cylinder diesel

Technical field

The utility model relates to the piston combustion bowl of a kind of cylinder diameter at φ 83～φ 93mm second generation single cylinder diesel, belongs to the single cylinder diesel technical field.

Background technique

Original little cylinder diameter single cylinder diesel, it is not very high that Single Cylinder Diesel Engine Emission is required, piston combustion bowl adopts straight mouth structure more.There has been further raising in country to the power unit emission request of farm machinery now, in line with the requirement of energy-saving and emission-reduction, and the novel single cylinder diesel of the exploitation second generation, therefore improving piston structure becomes top priority.Original straight shape of the mouth as one speaks firing chamber can not form enough crowded stream, and air utilization ratio is on the low side, causes fuel and Air mixing effect to reduce, and can't form desirable inflammable mixture, and it is insufficient to burn, and causes emission performance can't reach emission request.At these problems, present diesel engine solves by closing in type firing chamber, it uses for reference the structure of multi-cylinder engine piston combustion bowl, take all factors into consideration chamber structure, shape, size and the position of piston head to cylinder in the influence that mixes of air motion and oil gas, reach influence to diesel combustion characteristic, 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 and is produced the squish eddy current in the firing chamber, to help fuel and Air mixing.But because firing chamber closing in angle is little, the squish strength of vortex is little, can not reach desirable oil gas mixed effect.

Summary of the invention

The purpose of this utility model is to provide a kind of piston combustion bowl of second generation single cylinder diesel, not only reasonable in design, good manufacturability, and can farthest utilize air in the firing chamber to reach desirable oil gas mixed effect, satisfy single cylinder diesel high-performance, low emission requirement.

The technical solution of the utility model is: a kind of piston combustion bowl of second generation single cylinder diesel, comprise the firing chamber that is arranged on piston head, it is characterized in that: the diameter of described piston is at φ 83～φ 93mm, the bottom, firing chamber has symmetry and the crossing arc surface of center line, radius of arc C is between R5～R7mm, and the dark B of arc is between 14～17mm; The internal tangent of two arc surfaces intersects the formation conical surface, and conical surface intersection rounding off, the outer tangent line of two arc surfaces and the angle α between the piston medial axis are between 18 °～25 °, the circumscribed alignment burner port of two circular arcs extends and forms the aditus laryngis part at its oral area rounding off, the diameter H of aditus laryngis part is between φ 42～φ 47mm, degree of depth G is at 2.5～3.5mm, the knuckle radius E of aditus laryngis part and end face is between R1～2.0mm, and aditus laryngis part and outer tangent line knuckle radius F are between R3.5～4.5mm.

The utility model is by the analysis to air inlet system of single cylinder diesel engine, fuel injection characteristic and cylinder head general arrangement, reasonable Arrangement piston head closing in type combustion-chamber shape and size, not only reasonable in design, good manufacturability, and 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 the relative position of oil sprayer and firing chamber, make oil bundle and combustion-chamber shape coupling, the space distribution of oil bundle in the firing chamber is more reasonable, oil gas mixes desirable more, owing to air utilization ratio is improved, thereby reaches desirable high-performance, the index of low emission.Adopt the firing chamber of the utility model structure, can make single cylinder diesel 13 operating mode pollutant emissions reach European I standard, fuel-economizing, have good social benefit and economic benefit.

Description of drawings

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

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

Fig. 2 is that the A-A of Fig. 1 amplifies to cut open and shows structural representation.

Wherein: 1-piston, 11-firing chamber.

Embodiment

See shown in Fig. 1,2, the piston combustion bowl of the utility model second generation single cylinder diesel, 1 comprises the firing chamber 11 that is arranged on piston 1 top, the diameter of this piston 1 is at φ 83～φ 93mm, this firing chamber 11 is half point open combustion chamber and the top that is eccentrically set on piston 1, the fore-and-aft distance Y of the center line of this firing chamber 11 and piston 1 center line is at 3.5～6mm, with the lateral separation X of piston 1 center line at 0～2.0mm.The utility model redesigns the geomery of firing chamber 11, makes firing chamber 11 can reasonably utilize the air that enters piston head, makes diesel engine have oil gas mixed effect preferably.See firing chamber shown in Figure 2 11, its bottom has symmetry and the crossing arc surface of center line, and radius of arc C is between R5～R7mm, and the dark B of arc is between 14～17mm.The internal tangent of two circular arcs intersects the formation conical surface, and conical surface intersection rounding off, this knuckle radius D is between R6～R7mm, the angle α that forms between outer tangent line of two arc surfaces and the piston axis is between 18 °～25 °, the circumscribed alignment burner port of two circular arcs extends and forms the aditus laryngis part at its oral area rounding off, the diameter H of aditus laryngis part is between φ 42～φ 47mm, degree of depth G is at 2.5～3.5mm, the knuckle radius E of aditus laryngis part and end face is between R1～2.0mm, and aditus laryngis part and outer tangent line knuckle radius F are between R3.5mm～4.5mm.

Claims (3)

1, a kind of piston combustion bowl of second generation single cylinder diesel, comprise the firing chamber (11) that is arranged on piston (1) top, it is characterized in that: the diameter of described piston (1) is at φ 83～φ 93mm, bottom, firing chamber (11) has symmetry and the crossing arc surface of center line, radius of arc C is between R5～R7mm, and the dark B of arc is between 14～17mm; The internal tangent of two arc surfaces intersects the formation conical surface, and conical surface intersection rounding off, the outer tangent line of two arc surfaces and the angle α between the piston medial axis are between 18 °～25 °, the circumscribed alignment burner port of two circular arcs extends and forms the aditus laryngis part at its oral area rounding off, the diameter H of aditus laryngis part is between φ 42～φ 47mm, degree of depth G is at 2.5～3.5mm, the knuckle radius E of aditus laryngis part and end face is between R1～2.0mm, and aditus laryngis part and outer tangent line knuckle radius F are between R3.5～4.5mm.

2, the piston combustion bowl of second generation single cylinder diesel according to claim 1 is characterized in that: the radius D of described conical surface knuckle is between R6mm～R7mm.

3, the piston combustion bowl of second generation single cylinder diesel according to claim 1, it is characterized in that: the fore-and-aft distance Y of the center line of described firing chamber (11) and piston (1) center line is at 3.5～6mm, with the lateral separation X of piston (1) center line at 0～2.0mm.

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