JPS6173018U

JPS6173018U -

Info

Publication number: JPS6173018U
Application number: JP15725684U
Authority: JP
Priority date: 1984-10-19
Filing date: 1984-10-19
Publication date: 1986-05-17
Anticipated expiration: 1999-10-19
Also published as: JPH0531211Y2

Description

[Brief explanation of the drawing]

第１図は本考案の好適一実施例を示す図、第２
図は第１図の−線矢視断面図、第３図は本考
案の主燃焼室と副燃焼室及び断熱層を示す概略斜
視図、第４図は燃料噴射ノズルの概略断面図、第
５図、第６図は燃料の噴射方向を示す図、第７図
、第８図は従来例を示す図である。図中、１はピストンの頂部、２は主燃焼室、３
は副燃焼室、４は燃料噴射ノズル、５はピストン
、６は断熱層、１１は副噴口、１３は主噴口であ
る。 FIG. 1 is a diagram showing a preferred embodiment of the present invention, and FIG.
The figures are a sectional view taken along the line - - in Fig. 1, Fig. 3 is a schematic perspective view showing the main combustion chamber, sub-combustion chamber, and heat insulating layer of the present invention, Fig. 4 is a schematic sectional view of the fuel injection nozzle, and Fig. 5 is a schematic sectional view of the fuel injection nozzle. 6 are diagrams showing the fuel injection direction, and FIGS. 7 and 8 are diagrams showing a conventional example. In the figure, 1 is the top of the piston, 2 is the main combustion chamber, and 3
4 is a sub-combustion chamber, 4 is a fuel injection nozzle, 5 is a piston, 6 is a heat insulating layer, 11 is a sub-nozzle port, and 13 is a main nozzle port.

Claims

[Claims for Utility Model Registration] (1) A main combustion chamber recessed in the top of the piston, and a main combustion chamber recessed in the top of the piston that are arranged side by side so as to communicate with each other. A fuel injection nozzle having a sub-combustion chamber, a heat insulating layer lined on an inner wall of the sub-combustion chamber, a main nozzle for injecting fuel into the main combustion chamber, and a sub-nozzle for injecting fuel into the sub-combustion chamber. A direct injection diesel combustion chamber characterized by: (2) The direct injection diesel combustion chamber according to claim 1, wherein the auxiliary combustion chamber is formed to have a smaller volume than the main combustion chamber. (3) Claim 1 or 2 of the above utility model registration, wherein the main combustion chamber and the auxiliary combustion chamber have a circular cross section with an open top, and are communicated with each other by opening a part of their circumferential walls. Direct-injection diesel combustion chamber according to any of the above. (4) The utility model registration claim set forth in claim 1, wherein the fuel injection nozzle is configured to open the auxiliary nozzle when the needle valve has a predetermined lift or less, and to open the main nozzle when the needle valve has a predetermined lift or more. Direct injection diesel combustion chamber. (5) the fuel injection nozzle is located in a communicating portion connecting the main combustion chamber and the auxiliary combustion chamber, and directs its main injection port toward the inner wall of the main combustion chamber and in the swirl direction generated within the main combustion chamber; Further, the direct injection diesel combustion chamber according to claim 1 or 4 of the above-mentioned utility model registration claim, wherein the sub-nozzle port faces the inner wall of the sub-combustion chamber and the swirl direction generated within the sub-combustion chamber. . (6) The direct injection diesel combustion chamber according to claim 1, wherein the heat insulating layer is made of a material with excellent heat insulation and heat retention properties, such as ceramic.