JPS634332U

JPS634332U -

Info

Publication number: JPS634332U
Application number: JP9768186U
Authority: JP
Priority date: 1986-06-27
Filing date: 1986-06-27
Publication date: 1988-01-12

Description

[Brief explanation of the drawing]

第１図は本考案の好適一実施例を示す側断面図
、第２図はその平面図、第３図は本考案の他の実
施例を示す側断面図、第４図はその平面図、第５
図は従来例を示す側断面図、第６図はその平面図
、第７図は排気刺激臭とＬ／Ｒとの関係を示すグ
ラフ、第８図はスキツシユと燃焼室開口比との関
係を示すグラフである。図中、１はピストンヘツド、２は燃焼室、４は
その内壁面、５は凹陥部、６はリツプ部である。 FIG. 1 is a side sectional view showing a preferred embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side sectional view showing another embodiment of the present invention, and FIG. 4 is a plan view thereof. Fifth
Figure 6 is a side sectional view showing the conventional example, Figure 6 is its plan view, Figure 7 is a graph showing the relationship between the exhaust odor and L/R, and Figure 8 is the relationship between the exhaust gas and the combustion chamber opening ratio. This is a graph showing. In the figure, 1 is a piston head, 2 is a combustion chamber, 4 is an inner wall surface thereof, 5 is a concave portion, and 6 is a lip portion.

Claims

[Scope of Claim for Utility Model Registration] (1) A concave portion is provided by recessing the piston head outward in the radial direction at the inner wall surface position where fuel injected during low load reaches the combustion chamber formed by recessing the piston head. Combustion chamber structure of a direct injection diesel engine. (2) The combustion chamber structure of a direct injection diesel engine according to claim 1, wherein the piston head has an eave-like lip portion that covers the recessed portion from above. (3) The recessed portion forms a combustion chamber wall length in which the ratio of the injection length to the combustion chamber wall length is 1. Combustion chamber structure of direct injection diesel engine.