Exhaust apparatus of outboard motor

Patent metadata

Field	Value
Publication number	US-10036299-B2
Application number	US-201615057188-A
Country	US
Kind code	B2
Filing date	Mar 1, 2016
Priority date	Apr 10, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

An exhaust apparatus of an outboard motor equipped with a four-stroke engine includes an exhaust pipe having a cylindrical shape and being connected to an exhaust passage of an engine holder, wherein the exhaust pipe is disposed in an exhaust passage of the exhaust manifold in a manner being erected upright in parallel to the crankshaft, and the exhaust pipe has an upper end opened in an upper portion of the exhaust passage and a lower end supporting the cylinder block, and the exhaust manifold and the exhaust pipe are provided with a gap therebetween in a plan view acting as an exhaust collection space adapted to collect exhaust gas from the exhaust manifold.

First claim

The invention claimed is:

1. An exhaust apparatus of a four stroke engine of an outboard motor, wherein
the four-stroke engine includes a cylinder block, a cylinder head, a crank case, and the exhaust apparatus, wherein the cylinder block is provided therein with a cylinder that extends in a horizontal direction, wherein the cylinder head is fixed to the cylinder block so as to cover the cylinder, forms a combustion chamber in conjunction with the cylinder, and is formed with an intake port and an exhaust port in communication with the combustion chamber, wherein the crankcase is adapted to house a crankshaft that extends in a vertical direction, and
wherein, in the cylinder block and the cylinder head, a plurality of cylinder units, each equipped with including the cylinder, the combustion chamber, the intake port, and the exhaust port, are arranged side by side in the vertical direction, the exhaust apparatus comprising:
an exhaust manifold formed on one side of the cylinder block in a width direction of the outboard motor so as to be in communication with the exhaust ports of the plurality of cylinder units and to extend in parallel with the crankshaft; and
an exhaust pipe having a cylindrical shape, dispose in an exhaust passage of the exhaust manifold so as to be erected upright in parallel with the crankshaft, and having an upper end and a lower end, the upper end being opened in an upper portion of the exhaust passage, the lower end being connected to an exhaust passage of an engine holder that supports the cylinder block,
wherein the exhaust manifold and the exhaust pipe are provided with a gap therebetween in a planar view acting as an exhaust collection space adapted to collect exhaust gas from the exhaust manifold, and
a catalyst is disposed in an upper portion in the exhaust pipe and above the exhaust port of a lowermost cylinder in the cylinder block.

2. The exhaust apparatus of claim 1 , wherein the exhaust pipe and the exhaust collection space are disposed relative to each other along a cylinder axis of the four-stroke engine in planar view.

3. The exhaust apparatus of claim 1 , wherein the exhaust manifold is provided with an exhaust manifold portion formed in the cylinder block and an exhaust cover covering an opening in the exhaust manifold portion which are joined together, wherein the exhaust manifold portion and the exhaust cover are separable along a section parallel to an axial direction of the crankshaft.

4. The exhaust apparatus of claim 1 , wherein the four-stroke engine is a four-stroke V-type engine in which the cylinder block and the cylinder head are provided with a cylinder and a left bank extending diagonally left rearward, and with a cylinder and a right bank extending diagonally right rearward, and a left exhaust manifold is installed outward of the left bank in the width direction of the outboard motor, and a right exhaust manifold is installed outward of the right bank in the width direction of the outboard motor, wherein the left exhaust manifold and the right exhaust manifold communicate, respectively, with the exhaust ports in the left bank and the right bank.

5. The exhaust apparatus of claim 1 , wherein the exhaust pipe is deflected to a side opposite to openings of the exhaust ports in communication with the exhaust passage in the exhaust manifold, and the exhaust collection space adapted to collect exhaust gas from the exhaust ports is formed between the exhaust pipe and the openings of the exhaust ports.

Assignees

• Suzuki Motor Corp

Inventors

• Achiwa Tetsushi
• Daikoku Keisuke

Classifications

• F01N13/10

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

• F01N13/001

  Exhaust gas flow channels or chambers being at least partly formed in the structural parts of the engine or machine (using structural parts of the vehicle B60K13/06) · CPC title

• F01N3/10

  by thermal or catalytic conversion of noxious components of exhaust · CPC title

• F01N13/107

  More than one exhaust manifold or exhaust collector · CPC title

• B63H20/24

  Arrangements, apparatus and methods for handling exhaust gas in outboard drives, e.g.} exhaust gas outlets {(in engines, e.g. outboard marine engines, F01N) · CPC title