CN201843693U

CN201843693U - Piston combustion chamber for air-cooled single-cylinder diesel engine with small cylinder diameter

Info

Publication number: CN201843693U
Application number: CN2010202168841U
Authority: CN
Inventors: 章高伟
Original assignee: ANHUI HIGH-TECH PISTON MANUFACTURE Co Ltd
Current assignee: Anhui Hengtai Power Technology Co.,Ltd.
Priority date: 2010-06-07
Filing date: 2010-06-07
Publication date: 2011-05-25
Anticipated expiration: 2020-06-07

Abstract

The utility model discloses a piston combustion chamber for a single-cylinder diesel engine with a cylinder diameter of 75-80 mm, which comprises a W-shaped combustion chamber. The W-shaped combustion chamber is arranged on the top surface of a piston, the depth of the combustion chamber is 10-12 mm, and the radius of the circular arc surface at the bottom of the combustion chamber is 3-5 mm, and a taper angle on the circular conical surface of the middle part of the combustion chamber is 100-150 degrees; the distance from the vertex of the circular conical surface to the top surface of the piston is 4-6 mm; the diameter of a throat mouth of the combustion chamber is 33-37 mm; an included angle formed by an outer tangent line of the circular arc surface and a vertical line of the throat mouth is 45-60 degrees; the radius of a transition circular bead between the throat mouth and the top surface of the piston is 1-2 mm; the maximum diameter of the bottom part of the combustion chamber is 40-47 mm; the volume of the whole combustion chamber is 10.5-15 ml; and the distance between the center of the combustion chamber and the center of the piston is 2-4 mm in the x direction and is 1-3 mm in the y direction. The combustion chamber is reasonably designed and can effectively reduce the pollutant discharge of the single-cylinder air-cooled diesel engine with small cylinder diameter.

Description

The air-cooled single cylinder diesel piston combustion bowl of a kind of little cylinder diameter

Technical field

The utility model relates to a kind of single cylinder diesel piston combustion bowl, the low emission combustor that the air-cooled single-cylinder direct-injection diesel engine of particularly little cylinder diameter is used.

Background technique

Single-cylinder direct-injection diesel engine is mainly used in non-road machine equipment such as farm machinery, small engineering machinery, plays an important role in industrial and agricultural production.Along with the raising of people to environmental requirement, to the control of Single Cylinder Diesel Engine Emission also in continuous reinforcement.The diesel engine with direct injection noxious emission depends primarily on the formation and the in-cylinder combustion process of diesel engine mixed gas, and the quality of the formation of mixed gas and combustion process depends on the rational Match between injection system, firing chamber and the charge motion, and the raising of engine power performance and Economy also has closely in it and gets in touch.

The firing chamber is positioned at the top of piston, and its shape and structure directly influence eddy current and the turbulent quality of mixed gas in forming.Produce the intensity of squeezing stream in the firing chamber for the air that increases piston head upper, annular space latter stage in compression is clamp-oned, improve the quality that oil gas mixes, now reducing toroidal combustion chamber that adopt to improve the utilization ratio of air more.For little cylinder diameter direct-injection diesel engine, owing to be subjected to the restriction in chamber structure and size design space, the firing chamber offset is big, and the firing chamber bore is little, sprayed oil beam the wall amount many; Add the diesel engine speed height, the burning absolute time shortens relatively, and is difficult in the proportions of ingredients of limited volume and the extremely short good oil gas of time inner tissue; Combustion process tissue and middle big cylinder-diameter diesel engine are more complicated.Therefore to the appropriate design of firing chamber with optimize and improve air utilization ratio, oil gas air fuel ratio such as try one's best in the firing chamber is mixed, make partial mixture even as much as possible, be the difficult point of little cylinder diameter direct-injection diesel engine combustion process tissue and emission control.

Summary of the invention

The purpose of this utility model provides a kind of piston combustion bowl of little cylinder diameter direct-injection formula single-cylinder air-cooled diesel engine, to reduce the discharging of small-sized single cylinder air-cooled diesel organic pollutants.

The technical solution of the utility model is: a kind of low emission single-cylinder air-cooled diesel engine piston combustion bowl, it comprises toroidal combustion chamber, described toroidal combustion chamber is arranged on the top of piston, described piston diameter is 75～80mm, centre distance piston center, firing chamber is 2～4mm in the x direction, in the y direction is 1～3mm, the bottom, firing chamber is by forming along the arc surface of firing chamber center line symmetry, its pit depth is 10～12mm, the radius of arc surface is 3～5mm, conical surface is arranged at the middle part, firing chamber, and it is tangent with the arc surface of bottom, firing chamber, the cone angle of conical surface is 100～150 °, the conical surface summit is 4～6mm to the distance of piston-top surface, the circumscribed alignment burner port of arc surface extends and forms the aditus laryngis part at its oral area rounding off, throat diameter is 33～37mm, and the angle that the outer tangent line of arc surface and aditus laryngis vertical line form is 45～60 °, the knuckle radius of aditus laryngis and piston-top surface is 1～2mm, bottom, firing chamber maximum diameter is 40～47mm, the reducing ratio of reducing toroidal combustion chamber is 0.7～0.95, and the volume of whole firing chamber is 10.5～15ml.

The utility model makes the air of the annular space of piston head can produce stronger squish eddy current in clamp-oning the firing chamber by the shape and size of reasonable Arrangement reducing type firing chamber, the squish eddy current is well cooperated with intake swirl, thereby improve the mixing of oil gas; Simultaneously, by the relative position of rationalization's air inlet and adjustment oil sprayer and firing chamber, make the space distribution of oil bundle in the firing chamber more reasonable, oil gas mixes desirable more.Through verification experimental verification, the pollutant emission of the small-sized air-cooled single cylinder diesel of employing the utility model firing chamber has reached the requirement of the non-road diesel engine of GB 20891-2007 state's II emission standard and EPA IV Abgasgesetz.

Description of drawings

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

Fig. 1 is the position of firing chamber at piston head.

Fig. 2 is the chamber structure figure that is positioned at piston head.

Wherein: the distance at X-x direction upper combustion chamber centre distance piston center, the distance at Y-y direction upper combustion chamber centre distance piston center, 1-toroidal combustion chamber, D-toroidal combustion chamber bottom arc surface maximum diameter, the throat diameter of D1-toroidal combustion chamber, the d-combustion recess degree of depth, internal conical surface summit, d1-firing chamber is to the distance of piston-top surface, bottom, R-firing chamber arc surface radius, the knuckle radius of r-aditus laryngis and piston-top surface, α-firing chamber conical surface cone angle, the angle that the outer tangent line of β-arc surface and aditus laryngis vertical line form.

Embodiment

The utility model is the single cylinder diesel piston combustion bowl, its external diameter is 78mm, it comprises toroidal combustion chamber 1, described toroidal combustion chamber is arranged on piston head, centre distance place, firing chamber vertical piston central axis planar piston center X is 2.5mm, Y is 1.5mm, the combustion chamber throat diameter d is 34mm, bottom, firing chamber maximum dimension D is 42mm, the knuckle radius r of aditus laryngis and piston-top surface is 1mm, reducing is 0.81 than D1/D, and the combustion recess depth d is 11mm, and the radius R of bottom, firing chamber arc surface is 4mm, the cone angle of firing chamber conical surface is 140 °, the conical surface summit is 4mm to piston-top surface apart from d1, and the angle β that the outer tangent line of arc surface and aditus laryngis vertical line form is 50 °, and whole combustion chamber volume is 11.8ml.

Claims

1. low emission single cylinder diesel piston combustion bowl, it comprises toroidal combustion chamber, described toroidal combustion chamber is arranged on the end face of piston, bottom, described firing chamber forms pit by the arc surface along firing chamber center line symmetry, conical surface is arranged at middle part, described firing chamber, and it is tangent with the described arc surface of bottom, described firing chamber, the described firing chamber of the circumscribed alignment oral area of described arc surface extends and forms aditus laryngis at described oral area rounding off, the vertical line of described outer tangent line and described aditus laryngis forms angle, and described aditus laryngis and described piston-top surface form knuckle.

2. low emission single cylinder diesel piston combustion bowl according to claim 1, it is characterized in that: bottom, described firing chamber maximum diameter is 40～47mm, the described combustion recess degree of depth is 10～12mm, the radius of described arc surface is 3～5mm, the cone angle of described conical surface is 100～150 °, and described conical surface summit is 4～6mm to the distance of described piston-top surface, and described throat diameter is 33～37mm, described angle is 45～60 °, and described knuckle radius is 1～2mm.

3. low emission single cylinder diesel piston combustion bowl according to claim 1 and 2, it is characterized in that: described piston cylinder diameter is 75～80mm, the center line of described firing chamber is 2～4mm apart from the piston center line in the x direction, in the y direction is 1～3mm, the reducing ratio of reducing toroidal combustion chamber is 0.7～0.95, and the volume of whole firing chamber is 10.5～15ml.