Title:
COMBUSTION CHAMBER STRUCTURE FOR DIRECT-INJECTION ENGINE
Document Type and Number:
Japanese Patent JP2016186257
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a combustion chamber structure for a direct-injection engine, capable of reducing heat loss while maintaining a good combustion state, and also capable of suppressing the formation of smoke and unburnt materials.SOLUTION: The combustion chamber structure for a direct-injection engine includes a shallow-pan combustion chamber 5 formed with a cavity 4 having an approximately truncated cone shaped protruded part 7 at a center, recessed in an upper face 3 of a piston 2, and an injector 6 coaxially arranged above the shallow-pan combustion chamber 5. It is constructed so that the ratio of a depth H of the cavity 4 to an opening diameter D thereof is within a range of 20-25% and the ratio of an upper area A of the protruded part 7 to an opening area S of the cavity 4 is within a range of 9-16%, and, when the piston 2 is near a top dead center, an extension destination 9 of a fuel injection port 8 of the injector 6 is located at a peripheral edge 7a of the protruded part 7. The surface of the peripheral edge 7a of the protruded part 7 is coated with a heat insulation film 10.SELECTED DRAWING: Figure 1
Inventors:
ARATO KEITA
Application Number:
JP2015066787A
Publication Date:
October 27, 2016
Filing Date:
March 27, 2015
Export Citation:
Assignee:
ISUZU MOTORS LTD
International Classes:
F02F3/10; F02B23/06; F02F3/26
Domestic Patent References:
| JP2002227650A | 2002-08-14 | |||
| JP2013194561A | 2013-09-30 | |||
| JPS5484419U | 1979-06-15 | |||
| JPH0674049A | 1994-03-15 |
Foreign References:
| US20030196547A1 | 2003-10-23 |
Attorney, Agent or Firm:
Seiryu International Patent Service Corporation
Takayoshi in the daytime
Masao Sakaizawa
Isao Hirai
Yuki Yamada
Takayoshi in the daytime
Masao Sakaizawa
Isao Hirai
Yuki Yamada