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Step type combustion chamber of heavy-duty diesel engine

A technology of heavy-duty diesel engines and combustion chambers, applied in combustion engines, mechanical equipment, engine components, etc., can solve the problems of incomplete fuel combustion and less air utilization, and achieve the effects of simple structure, reduced Soot emissions, and novel ideas

Inactive Publication Date: 2018-03-02
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a step-type combustion chamber for a heavy-duty diesel engine in view of the problems that the existing heavy-duty diesel engine combustion chamber structure uses less air on the upper part of the combustion chamber, and the incomplete fuel combustion produces higher Soot emissions.

Method used

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  • Step type combustion chamber of heavy-duty diesel engine
  • Step type combustion chamber of heavy-duty diesel engine
  • Step type combustion chamber of heavy-duty diesel engine

Examples

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] see figure 1 , a stepped combustion chamber of a heavy-duty diesel engine, which is arranged on the top of the piston, including a combustion chamber outlet 8 connected in sequence from the piston top surface 7 to the bottom of the combustion chamber, a straight combustion chamber throat 9, a pit 5 and a central boss 6 , the central boss 6 is a conical boss at the center of the combustion chamber, and its height cannot interfere with the spray; the pit 5 is a bottom arc-shaped groove connected to the central boss 6; the outlet 8 of the combustion chamber is a step structure. The diameter-to-depth ratio (D / H) of the combustion chamber is 3.9-4.1, wherein D is the diameter of the combustion chamber, H is the depth of the combustion chamber; the height Tm of the central boss 6 ranges from 5-12mm.

[0019] see figure 1 The ste...

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PUM

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Abstract

A step type combustion chamber of a heavy-duty diesel engine comprises a combustion chamber outlet (8), a straight port combustion chamber throat port (9), a pit (5) and a central boss (6) which are connected in sequence from a piston top face (7) to the bottom of the combustion chamber; the combustion chamber outlet (8) is of a step structure; the step structure comprises an arc section (1), a step vertical section (2) and a step transverse section (4) which are connected in sequence from top to bottom; and the lower end of the step transverse section (4) is connected with the straight port combustion chamber throat port (9) through a chamfer I. The step structure has a flow guiding effect and can guide more fuel oil to the upper portion of the combustion chamber, and by matching of sprayed and entrained airflow, upper and middle air can be better utilized, so that soot emission is reduced obviously.

Description

technical field [0001] The invention relates to a combustion chamber, more specifically to a stepped combustion chamber of a heavy-duty diesel engine, which belongs to the technical field of automobile engines and related systems. Background technique [0002] see Image 6 , at present, the outlet 8 of the combustion chamber in the commonly used heavy-duty diesel engine combustion chamber structure is usually rounded or oblique, and the type is generally in the form of a shrinking or straight opening, specifically as Image 6 shown. The area where the combustion of the combustion chamber mainly occurs is the pit 5. The existing heavy-duty diesel engine combustion chamber structure makes less use of the air in the upper part of the combustion chamber, and after adding EGR, O 2 The content becomes less, so that the incomplete combustion of fuel produces higher Soot emissions. Contents of the invention [0003] The object of the present invention is to provide a stepped comb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B23/06F02F3/26
CPCF02B23/0672F02F3/26Y02T10/12
Inventor 韩潇杨尚丽余宏峰
Owner DONGFENG COMML VEHICLE CO LTD
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