Title:
エンジンの排気装置
Document Type and Number:
Japanese Patent JP6471851
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an engine exhaust device which can suit with a real vehicle structure, improve volume efficiency, and increase torque.SOLUTION: An engine exhaust device is equipped with: a first exhaust passage 11 which communicates with an exhaust port of an engine; a first muffler 21; a second exhaust passage 12; a second muffler 21; and a third exhaust passage 13. The exhaust path length of a first exhaust path L, a second exhaust path M, and a third exhaust path N is length with which negative pressure waves generated by reflecting exhaust pressure waves discharged from the engine operating at first engine speed, second engine speed, and third engine speed, on a first boundary A, a second boundary B, and a third boundary C reach the exhaust port during a valve overlap period. A capacity of the second muffler 22 is larger than a capacity of the first muffler 21. A cross-sectional area of the second exhaust passage 12 is smaller than a cross-sectional area of the first exhaust passage 11, and a cross-sectional area of the third exhaust passage 13 is larger than a cross-sectional area of the first exhaust passage 11 and a cross-sectional area of the second exhaust passage 12.SELECTED DRAWING: Figure 1
Inventors:
Kojima Mitsutaka
Application Number:
JP2015008839A
Publication Date:
February 20, 2019
Filing Date:
January 20, 2015
Export Citation:
Assignee:
MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
International Classes:
F02B27/04; F01N5/00; F02D13/02
Domestic Patent References:
| JP2013113224A | ||||
| JP2012041899A | ||||
| JP2010174662A | ||||
| JP63171621U | ||||
| JP2012149585A | ||||
| JP2013185446A |
Attorney, Agent or Firm:
Hiroyuki Kurihara
Mountain Saki Yuichiro
Mountain Saki Yuichiro