Outboard motor

Patent metadata

Field	Value
Publication number	US-9938879-B2
Application number	US-201615058929-A
Country	US
Kind code	B2
Filing date	Mar 2, 2016
Priority date	Apr 14, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Disclosed is an outboard motor including an exhaust manifold having a first passage that is provided with a plurality of first openings connected to a plurality of exhaust ports and extends vertically, and a second passage that is arranged under the first passage and has a second opening provided in a lower end portion and connected to a third passage formed in the engine holder. The first and second passages of the exhaust manifold are formed integrally, and the exhaust manifold is formed separately from the cylinder head and the cylinder block and is detachably installed.

First claim

What is claimed is:

1. An outboard motor comprising:
an in-line multi cylinder four-cycle engine comprising:
a cylinder block having a plurality of cylinders arranged side by side along a vertical direction;
a cylinder head that forms each combustion chamber in cooperation with the cylinders of the cylinder block and has exhaust ports connected to the combustion chambers; and
pistons reciprocating in a front-rear direction of the outboard motor;

an engine holder that supports the four-cycle engine and connects the engine to a lower unit; and
an exhaust manifold comprising:
a first passage that has a plurality of first openings connected to the exhaust ports and extends vertically;
a second passage that is arranged under the first passage and has a second opening provided in a lower end portion and connected to a third passage formed in the engine holder;
a fourth passage branching from an upper portion of the first passage, communicating with the second passage, internally having an exhaust gas cleaning catalyst, extending vertically along the first passage and arranged in line with both a cylinder block side in front of the first passage and a cylinder head side in rear of the first passage; and
an oxygen sensor for detecting an oxygen concentration in the exhaust gas is disposed in an upper portion of the first passage or in the second passage of the exhaust manifold,

wherein the first and second passages of the exhaust manifold are formed integrally,
wherein the exhaust manifold is formed separately from the cylinder head and the cylinder block and is detachably installed, and
wherein the first and second passages of the exhaust manifold are partitioned by a partitioning wall.

2. The outboard motor according to claim 1 , wherein the fourth passage of the exhaust manifold is detachably installed to a body of the exhaust manifold provided with the first and second passages, and
a coupling portion dividable into a first passage side and a second passage side is formed in the middle of the fourth passage.

Assignees

• Suzuki Motor Corp

Inventors

• Shomura Nobuyuki
• Hamada Ryuji

Classifications

• F01N13/0097

  the purifying devices are arranged in a single housing · CPC title

• F01N2590/021

  for outboard engines · CPC title

• F01N13/12

  specially adapted for submerged exhausting · CPC title

• F01N13/10 Primary

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

• F01N13/0093

  the purifying devices are of the same type · CPC title