Exhaust device of motorcycle

Patent metadata

Field	Value
Publication number	US-9708963-B2
Application number	US-201615051644-A
Country	US
Kind code	B2
Filing date	Feb 23, 2016
Priority date	Feb 25, 2015
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

An exhaust device includes left and right exhaust pipes and mufflers connected to a downstream side of the left and right exhaust pipes. The pair of left and right exhaust pipes respectively includes a merging portion. A catalyst is provided to the merging portion respectively. The pair of left and right exhaust pipes respectively includes, on a downstream side of the catalyst, a branching portion that has one side thereof extending to the muffler and the other side thereof extending to a connecting pipe. An oxygen sensor is provided to one side on a downstream side of the pair of left and right branching portions.

First claim

What is claimed is:

1. An exhaust device of a motorcycle, comprising:
a left and right exhaust pipes configured to discharge an exhaust gas from a multi-cylinder engine, the left and right exhaust pipes including:
a muffler connected to a downstream side of the left and right exhaust pipes, the muffler configured to reduce an exhaust noise and to discharge the exhaust gas to an outside of the motorcycle,
a merging portion configured to merge the exhaust gas discharged from respective cylinders of the multi-cylinder engine,
a catalyst configured to purify the exhaust gas discharged through the merging portion, respectively, and
a branching portion, on a downstream side of the catalyst, which has a first side thereof extending to the muffler and a second side thereof extending to a connecting pipe configured to interconnect the left and right exhaust pipes to each other; and

an oxygen sensor present in the first side on a downstream side of a left and right branching portions of the branching portion, whereby the exhaust gas is stirred in a rear portion of the merging portion and the branching portion, and
wherein the connecting pipe is arranged below the oxygen sensor and overlaps the oxygen sensor in a longitudinal direction of the motorcycle.

2. The exhaust device of the motorcycle according to claim 1 , wherein an upper end of the oxygen sensor is directed toward the inside of the motorcycle in a motorcycle width direction, and overlaps with left and right protectors that cover the left and right exhaust pipes as viewed in a side view of the motorcycle.

3. The exhaust device of the motorcycle according to claim 1 , wherein an upper end of the oxygen sensor is directed toward an inside of the motorcycle in a motorcycle width direction, and overlaps with left and right protectors that cover the left and right exhaust pipes as viewed in a side view of the motorcycle.

4. The exhaust device of the motorcycle according to claim 1 , wherein an upper end of the oxygen sensor is directed toward an inside of the motorcycle in a motorcycle width direction, and overlaps with left and right protectors that cover the pair of left and right exhaust pipes as viewed in a side view of the motorcycle.

Assignees

• Honda Motor Co Ltd

Inventors

• Hayama Yoshitaka
• Seki Yoshitaka
• Shibata Hiromi
• Abe Takeru

Classifications

• F01N2590/04

  for motorcycles · CPC title

• F01N13/10 Primary

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

• F01N13/011

  having two or more purifying devices arranged in parallel · CPC title

• F01N2340/00

  Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the exhaust apparatus; Spatial arrangements of exhaust apparatuses · CPC title

• F01N2470/20

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