Title:
COMBUSTION CHAMBER STRUCTURE OF DIESEL ENGINE
Document Type and Number:
Japanese Patent JP2017025929
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To suppress degradation of unburned HC by pilot injection in idling, while suppressing degradation of soot in a medium-high load region.SOLUTION: A piston 4 has a reentrant type cavity 6, and a fuel injection nozzle of multi-injection holes is disposed on a center line of the cavity. In the cavity 6, a lip portion 42 of a smallest diameter is disposed at a lower part with respect to a piston crown surface 43, and a pocket portion 44 is formed at an upper part with respect to the lip portion 42. The pocket portion 44 is located on a height position where pilot injection injected before a top dead point is directed in idling of an engine, and a position of a wall surface 45 is determined so that a spray tip does not strongly collide therewith. A fuel of the pilot injection temporarily stays in the pocket portion 44, and then flows into the cavity 6 by squish flow thereafter.SELECTED DRAWING: Figure 2
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Inventors:
UEHARA KAZUMASA
TSUJI NAOHIDE
EMI MASAHIKO
TSUJI NAOHIDE
EMI MASAHIKO
Application Number:
JP2016207428A
Publication Date:
February 02, 2017
Filing Date:
October 24, 2016
Export Citation:
Assignee:
NISSAN MOTOR
International Classes:
F02B23/06; F02B23/00; F02F3/26; F16J1/00
Domestic Patent References:
| JP2015527615A | 2015-09-17 | |||
| JP2006118427A | 2006-05-11 | |||
| JP2012026412A | 2012-02-09 | |||
| JP2004245047A | 2004-09-02 |
Attorney, Agent or Firm:
Hiromichi Kobayashi
Tomioka Kiyoshi
Tomioka Kiyoshi
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