Exhaust device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10267206-B2
Application number	US-201415504356-A
Country	US
Kind code	B2
Filing date	Sep 3, 2014
Priority date	Sep 3, 2014
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

In inline four cylinder internal combustion engine ( 1 ), exhaust ports for a # 2 cylinder and a # 3 cylinder merge inside cylinder head ( 3 ) and form an opening serving as a single collective exhaust port. Exhaust manifold ( 5 ) has individual exhaust pipes ( 6, 7 ) for # 1 and # 4 cylinders and collective exhaust pipe ( 8 ), and the leading ends of these three exhaust pipes ( 6, 7, 8 ) are connected to catalytic converter ( 11 ). Exhaust gas introduction angle (θ 2 ) of each of individual exhaust pipes ( 6, 7 ) is larger by 30-60 degrees than exhaust gas introduction angle (θ 1 ) of collective exhaust pipe ( 8 ). Consequently, flow velocity distribution and temperature distribution in a catalyst carrier become uniform.

First claim

The invention claimed is:

1. An exhaust device for an internal combustion engine, comprising:
a collective exhaust pipe through which exhaust gases of a plurality of cylinders flow; and
a plurality of individual exhaust pipes through which respective exhaust gases of cylinders independently flow,
wherein the collective exhaust pipe and the individual exhaust pipes are connected to a diffuser portion of a single catalytic converter, and
wherein an introduction angle of each of the individual exhaust pipes with respect to a central axis of the catalytic converter is set larger than an introduction angle of the collective exhaust pipe with respect to the central axis of the catalytic converter,
wherein the plurality of the individual exhaust pipes merge at a part immediately close to the catalytic converter and are connected to the diffuser portion, and
wherein a passage cross-sectional area of the collective exhaust pipe is set larger than a passage cross-sectional area of each of the individual exhaust pipes.

2. The exhaust device for the internal combustion engine according to claim 1 , wherein the internal combustion engine is an inline four cylinder internal combustion engine,
wherein exhaust ports for a # 2 cylinder and a # 3 cylinder merge inside a cylinder head and form a single collective exhaust port, and
wherein the collective exhaust pipe is connected to the collective exhaust port.

3. The exhaust device for the internal combustion engine according to claim 1 , wherein the central axis of the catalytic converter is set obliquely outward with respect to a vertical direction of the internal combustion engine, and
wherein a leading end part of the collective exhaust pipe which is directed downward is connected to be inclined with respect to the central axis.

4. The exhaust device for the internal combustion engine according to claim 1 , wherein the central axis of the catalytic converter is set to be substantially parallel to a vertical direction of the internal combustion engine, and
wherein a leading end part of the collective exhaust pipe which is directed downward is connected to be substantially parallel to the central axis.

5. The exhaust device for the internal combustion engine according to claim 1 , wherein a difference between the introduction angle of each of the individual exhaust pipes and the introduction angle of the collective exhaust pipe is 30-60 degrees.

Assignees

• Nissan Motor

Inventors

• Hamamoto Takayuki
• Sugiyama Takanobu
• Fujita Hidehiro

Classifications

• F02F1/42

  Shape or arrangement of intake or exhaust channels in cylinder heads · CPC title

• F01N2340/02

  Distance of the exhaust apparatus to the engine or between two exhaust apparatuses · CPC title

• F01N2470/18

  the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus · CPC title

• F01N2470/20

  Dimensional characteristics of tubes, e.g. length, diameter · CPC title

• F01N13/10 Primary

  of exhaust manifolds {(with cooling jacket F01N3/046)} · CPC title