CN202611915U

CN202611915U - Piston combustion chamber with large throat area and small depth

Info

Publication number: CN202611915U
Application number: CN 201220123437
Authority: CN
Inventors: 胡雪松; 贺兆欣; 李金武
Original assignee: Dongfeng Chaoyang Diesel Co Ltd
Current assignee: Dongfeng Chaoyang Diesel Co Ltd
Priority date: 2012-03-28
Filing date: 2012-03-28
Publication date: 2012-12-19
Anticipated expiration: 2022-03-28

Abstract

The utility model discloses a piston combustion chamber with a large throat area and small depth. The combustion chamber is round, wherein an annular throat is formed at the inner periphery of the combustion chamber and divides the inner periphery of the combustion chamber into a slope surface and a concave surface; a convex core is arranged in the center of the combustion chamber; an included angle of an arc surface of the convex core is 120 degrees; an included angle between the slope surface and the horizontal line of the top surface of a piston body is 18 degrees; the arc length R of a transition section of the slope surface and the concave surface is 2mm; the distance between the bottommost part of the concave surface and the upper top surface of the combustion chamber is 19.2mm; the diameter of the annular throat is 67.6+/-0.1mm; and the diameter of the concave surface is 70+/-0.1mm. The combustion chamber is not eccentric, so that a fuel injector can be centrally-mounted; and the slope surface and the concave surface are transited through an R fillet, so that the strength and shape of vortex can be reasonably controlled, a fuel in an organization cylinder and air are fully mixed and combusted, dead volume is eliminated, the power performance of a diesel engine is improved, and emission is reduced.

Description

The piston combustion bowl that the big degree of depth of a kind of throat area is little

Technical field

The utility model belongs to Structure of Internal-Combustion Engine, is specifically related to the relatively little piston combustion bowl of the big degree of depth of a kind of throat area.

Background technique

At present China city to the confidential minimum discharge standard of asking of internal combustion basically all more than the III of Europe.Diesel-oil vehicle is used engine piston, and four air valve structures are adopted in air inlet, dispose the Electrocontrolled high-pressure common rail system equally, in emission control, can only reach the EUROIII Emission Standard requirement, and IV above emission standard in Europe requires also not reach.The problem that present firing chamber exists is, throat area is smaller, and the central depths of firing chamber is deep, is unfavorable for the abundant burning of mixed gas.Putting before this, the utility model has proposed a kind of new chamber structure on the basis of two air valve structures; Section shape is a shallow pot shape, changes cone shape in the past, and there is arc-shaped convex in the center portion; Less reducing is arranged near the edge, and the edge adopts shallow uncovered structure.The burning tissue can be improved in this firing chamber, makes emission standard reach Europe IV or higher.

Summary of the invention

The purpose of the utility model is, provides the big degree of depth of a kind of throat area little piston combustion bowl, makes fully atomization combustion of fuel oil.

Describe below in conjunction with the principle and the structure of accompanying drawing the utility model.The piston combustion bowl that the big degree of depth of a kind of throat area is relatively little, its Combustion chamber design are circular, and the firing chamber inner periphery has a ring-type reducing, and the ring-type reducing is divided into domatic the firing chamber inner periphery and concave surface two-part.The center, firing chamber is a protruding core, and protruding core cambered surface angle is 120 °.Domatic and piston body end face horizontal line angle are 18 °, the changeover portion arc length R=2mm of domatic and concave surface.The end face distance is 19.2mm on concave surface bottommost and the firing chamber; The ring-type reentrant diameter is 67.6 ± 0.1mm; The concave surface diameter is 70 ± 0.1mm.

The firing chamber does not have off-centre, and it is mid-to be adapted to oil sprayer.Domatic and concave surface be with the round-corner transition of R, and the intensity of controlled vortex flow rationally and form are organized fully mixing and burning of cylinder fuel and air, eliminate dead volume, make fuel combustion more abundant, improve the power character of diesel engine and discharge with reduction.

Characteristics of the present invention and beneficial effect be, with respect to many valves, simplifies the structure, and the mist of oil of burning chamber of diesel engine is well burnt, and reaches the above emission standard of Europe IV, improved discharge control level.

Description of drawings

Shown in accompanying drawing be the utility model cross-section structure principle sketch.

Embodiment

Below in conjunction with accompanying drawing and through embodiment the principle and the structure of model utility are done further explanation.

The piston combustion bowl that the big degree of depth of throat area is relatively little, its structure are that firing chamber 1 is designed to circle, and the firing chamber inner periphery has a ring-type reducing 2, the ring-type reducing with the firing chamber inner periphery be divided into domatic 3 with 4 two parts of concave surface.The center, firing chamber is a protruding core, and protruding core cambered surface angle is 120 °.Domatic 3 with piston body end face horizontal line angle β=18 °, domatic 3 with the changeover portion arc length R=2mm of concave surface 4; The end face distance is 19.2mm on concave surface 4 bottommosts and the firing chamber; Ring-type reducing 2 diameters are 67.6 ± 0.1mm; Concave surface 4 diameters are 70 ± 0.1mm.

The shape of this chamber structure runner can with the oily Shu Shixian best fit of ejection, the drop point of oil bundle can not be mapped to and be in position too low in the firing chamber, is very beneficial for fuel oil and Air mixing like this.Reasonably controlled vortex flow intensity and form organize cylinder fuel and air fully to mix and burning, and oil bundle point is not sticked on the wall of firing chamber.The protruding core design of middle part orthodrome, purpose are to eliminate dead volume to make burning more abundant, improve the power character of diesel engine and reduce discharging, because sufficient combustion, so effectively reduce NO _XDischarging content with the particle composition.

Use on this firing chamber CY6D state four diesel engines, through the performance comparison test, the design that has proved this firing chamber is successful, has guaranteed the power character and the emission request of motor.Exhaust index shows that this type has reached below the limit value requirement, concrete leading indicator such as following table.

?	CO	HC	NOX	PM
					Before not transforming	0.91	0.65	3.48	0.02
The utility model	0.81	0.21	1.97	0.018

Claims

1. the little piston combustion bowl of the big degree of depth of throat area is characterized in that firing chamber (1) is designed to circle, and the firing chamber inner periphery has a ring-type reducing (2); The ring-type reducing is divided into domatic (3) and concave surface (4) two-part with the firing chamber inner periphery; The center, firing chamber is a protruding core, and protruding core cambered surface angle is 120 °, domatic and piston body end face horizontal line angle β=and 18 °; The changeover portion arc length R=2mm of domatic and concave surface; The end face distance is 19.2mm on concave surface bottommost and the firing chamber, and the ring-type reentrant diameter is 67.6 ± 0.1mm, and the concave surface diameter is 70 ± 0.1mm.