US 6,616,492 B2Granted

Exhaust structure of personal watercraft

AssigneeKawasaki Jukogyo Kabushiki Kaisha

InventorYoshimoto Matsuda

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Abstract

Disclosed is an exhaust structure of a silent jet-propulsion personal watercraft capable of preventing water ingress into an exhaust system even when the watercraft is inverted. An exhaust structure of the watercraft is configured to cause an exhaust gas from an engine for driving a water jet pump to be discharged outside the watercraft through an exhaust passage, the exhaust passage includes a vertically extending water catcher having a substantially closed space in an upper portion thereof; an upstream exhaust passage having one end connected to an exhaust port of the engine and the other end connected to the water catcher at a position below the closed space; and a downstream exhaust passage having one end connected to the water catcher at a position below the closed space and the other end opened to outside of the watercraft.

Claims10

Dependent claims

A personal watercraft comprising:

a water jet pump including an outlet port, the water jet pump pressurizing and accelerating water taken in from outside of the watercraft and ejecting the water from the outlet port to propel the watercraft as a reaction of the ejecting water;
an engine for driving the water jet pump;
and
an exhaust passage connected to an exhaust port of the engine, for discharging an exhaust gas from the engine to outside of the watercraft, wherein
the exhaust passage includes:
a water catcher extending vertically and having a substantially closed space in an upper portion thereof;
an upstream exhaust passage having one end connected to the exhaust port of the engine and the other end connected to the water catcher at a position below the closed space;
and
a downstream exhaust passage having one end connected to the water catcher at a position below the closed space and the other end being opened to outside of the watercraft.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/198,430Filed 16 Jul 2002
Priority: JP 2001-22157423 Jul 2001
Published: US 2003/0017759 A123 Jan 2003
Granted: 9 Sep 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

B63H 21/32
Use of propulsion power plant or units on vessels: arrangements of propulsion power-unit exhaust uptakes; Funnels peculiar to vessels
B63B 34/10
Vessels specially adapted for water sports or leisure; Body-supporting devices specially adapted for water sports or leisure: power-driven…
B63H
Marine propulsion or steering
B63B
Ships or other waterborne vessels