Exhaust emission control device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10273905-B2
Application number	US-201615007895-A
Country	US
Kind code	B2
Filing date	Jan 27, 2016
Priority date	Feb 2, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

An exhaust emission control device for an internal combustion engine including multiple reed valve chambers which are provided to cylinder head portions of a multi-cylinder engine. The reed valve chambers are formed by covering recessed portions in the cylinder head portion with reed valve covers. Upstream sides of the reed valve chambers communicate with the atmosphere via a secondary air supply pipe. Downstream sides of the reed valve chambers communicate with exhaust ports via communication passages provided to the cylinder head portion. The reed valves are interposed between the upstream sides and the downstream sides of the reed valve chambers, and are opened by exhaust pulsation pressure. In the cylinder head portion, the multiple reed valve chambers are disposed with spaces therebetween. The reed valve covers communicate individually with the secondary air supply pipe, and the reed valve covers are connected in series by the secondary air supply pipe.

First claim

What is claimed is:

1. An exhaust emission control device for an internal combustion engine comprising
a plurality of reed valve chambers respectively including reed valves, and provided to a cylinder head portion of a multi-cylinder internal combustion engine,
the reed valve chambers being formed by covering recessed portions provided to the cylinder head portion respectively with reed valve covers, and
the reed valve chambers having upstream sides which communicate with the atmosphere via a separate secondary air supply pipe provided to the cylinder head portion; and downstream sides which communicate with exhaust ports via communication passages provided to the cylinder head portion, and
the reed valves being interposed between the upstream sides and the downstream sides of the reed valve chambers, and the reed valves being opened by exhaust pulsation pressure, wherein
in the cylinder head portion, the plurality of reed valve chambers are disposed with spaces therebetween,
the plurality of reed valve covers communicate individually with the secondary air supply pipe, and the reed valve covers are connected in series by the secondary air supply pipe, and
the plurality reed valve covers are integrally formed with the secondary air supply pipe into an integrated passage-cover unit that is releasably connected to the cylinder head portion and covered by a cylinder head cover.

2. The exhaust emission control device for an internal combustion engine according to claim 1 , wherein
all of the plurality of reed valve covers connected in series by the secondary air supply pipe are connected to, and integrally formed with, a single one of the secondary air supply pipe.

3. The exhaust emission control device for an internal combustion engine according to claim 1 , wherein
each of the reed valve chambers is disposed to be inclined from a horizontal direction,
a communication passage inlet leading to a corresponding one of the communication passages is formed above a bottom portion of an inside of the reed valve chamber, and
a bottom portion of an intra-pipe passage of the secondary air supply pipe is disposed above the communication passage inlet.

4. The exhaust emission control device for an internal combustion engine according to claim 1 , wherein
the reed valve covers are each shaped almost like a rectangle having a longitudinal direction, and
the secondary air supply pipe is disposed in an apex portion of the cylinder head portion in a way to extend in the longitudinal direction of each reed valve cover, and in a way to overlap the reed valve covers as viewed in a direction of a cylinder axis.

5. The exhaust emission control device for an internal combustion engine according to claim 4 , wherein
the multi-cylinder internal combustion engine is an in-line multi-cylinder internal combustion engine,
a plurality of ignition coil devices respectively for cylinders are provided to an outer end of the cylinder head portion in the direction of the cylinder axis, and
the reed valve chambers and the ignition coil devices are alternately disposed.

6. The exhaust emission control device for an internal combustion engine according to claim 5 , wherein
the in-line multi-cylinder internal combustion engine including two of the cylinder head portions horizontally-opposed from one another, and
the two cylinder head portions include the reed valve covers and the secondary air supply pipe common to each other.

7. The exhaust emission control device for an internal combustion engine according to claim 2 , wherein
each of the reed valve chambers is disposed to be inclined from a horizontal direction,
a communication passage inlet leading to a corresponding one of the communication passages is formed above a bottom portion of an inside of the reed valve chamber, and
a bottom portion of an intra-pipe passage of the secondary air supply pipe is disposed above the communication passage inlet.

8. The exhaust emission control device for an internal combustion engine according to claim 2 , wherein
the reed valve covers are each shaped almost like a rectangle having a longitudinal direction, and
the secondary air supply pipe is disposed in an apex portion of the cylinder head portion in a way to extend in the longitudinal direction of each reed valve cover, and in a way to overlap the reed valve covers as viewed in a direction of a cylinder axis.

9. The exhaust emission control device for an internal combustion engine according to claim 3 , wherein
the reed valve covers are each shaped almost like a rectangle having a longitudinal direction, and
the secondary air supply pipe is disposed in an apex portion of the cylinder head portion in a way to extend in the longitudinal direction of each reed valve cover, and in a way to overlap the reed valve covers as viewed in a direction of a cylinder axis.

10. The exhaust emission control device for an internal combustion engine according to claim 8 , wherein
the multi-cylinder internal combustion engine is an in-line multi-cylinder internal combustion engine,
a plurality of ignition coil devices respectively for cylinders are provided to an outer end of the cylinder head portion in the direction of the cylinder axis, and
the reed valve chambers and the ignition coil devices are alternately disposed.

11. The exhaust emission control device for an internal combustion engine according to claim 10 , wherein
the in-line multi-cylinder internal combustion engine including two of the cylinder head portions horizontally-opposed from one another, and
the two cylinder head portions include the reed valve covers and the secondary air supply pipe common to each other.

12. The exhaust emission control device for an internal combustion engine according to claim 9 , wherein
the multi-cylinder internal combustion engine is an in-line multi-cylinder internal combustion engine,
a plurality of ignition coil devices respectively for cylinders are provided to an outer end of the cylinder head portion in the direction of the cylinder axis, and
the reed valve chambers and the ignition coil devices are alternately disposed.

13. The exhaust emission control device for an internal combustion engine according to claim 12 , wherein
the in-line multi-cylinder internal combustion engine including two of the cylinder head portions horizontally-opposed from one another, and
the two cylinder head portions include the reed valve covers and the secondary air supply pipe common to each other.

Assignees

• Honda Motor Co Ltd

Inventors

• Ikebe Yoshiyuki
• Yokota Hiroshi
• Sugiura Hiroyuki

Classifications

• F01N2590/04

  for motorcycles · CPC title

• F02B75/20

  with cylinders all in one line · CPC title

• F01L3/205

  Reed valves · CPC title

• F01N3/22

  Control of additional air supply only, e.g. using by-passes or variable air pump drives · CPC title

• F02M23/003 Primary

  Particular shape of air intake · CPC title