Water jet propulsion watercraft

Patent metadata

Field	Value
Publication number	US-9199710-B2
Application number	US-201414277187-A
Country	US
Kind code	B2
Filing date	May 14, 2014
Priority date	Apr 8, 2009
Publication date	Dec 1, 2015
Grant date	Dec 1, 2015

Abstract

A water jet propulsion watercraft includes a hull having a sealed engine room, an engine installed in the engine room, a jet propulsion unit arranged to be driven by the engine so as to suck in water from around the hull and jet the water, a saddle type seat disposed above the engine room, a first exhaust pipe, an exhaust pipe cooling unit, and a catalyst unit. The first exhaust pipe is attached to a side of the engine inside the engine room, extends rearward from the side of the engine, and is arranged to guide exhaust gas discharged from the engine. The exhaust pipe cooling unit is arranged to cool the first exhaust pipe. The catalyst unit is connected to the first exhaust pipe, is disposed inside the engine room so as to oppose a rear surface of the engine, and is arranged to promote reaction of components contained in the exhaust gas.

First claim

What is claimed is:

1. A water jet propulsion assembly comprising:
an engine including a cylinder head including an exhaust port, and a rear surface facing a rear direction of the water jet propulsion assembly;
a jet propulsion unit configured to be driven by the engine so as to suck in water from outside of the water jet propulsion assembly and jet the water;
a first exhaust pipe attached to a side of the engine, connected to the exhaust port, extending rearward from the exha…

Assignees

• Yamaha Motor Co Ltd

Inventors

• Ozawa Shigeyuki

Classifications

• F01N13/12

  Mechanical Engineering · mapped topic

• Y02T10/20

  Cross-Sectional Technologies · mapped topic

• B63H21/383

  Operations & Transport · mapped topic

• B63H11/02 Primary

  Operations & Transport · mapped topic

• F01N3/043

  Mechanical Engineering · mapped topic