US Patent 7168999 Exhaust gate valve apparatus for a personal watercraft

Patent 7168999 was granted and assigned to Honda on January, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Honda

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7168999

Date of Patent

January 30, 2007

Patent Application Number

11223503

Date Filed

September 9, 2005

Patent Primary Examiner

‌

Stephen Avila

Patent abstract

An exhaust gate valve apparatus of a water jet propulsion-driven watercraft is provided that is capable of positively closing an exhaust port with a valve body when an engine is stationary and widely opening the valve body when the engine runs. In the watercraft, an exhaust port of a tail pipe is arranged to face an opening in a top wall of a pump chamber. The exhaust gate valve apparatus includes a valve body, valve body support flange, pressure device, and a jet water expelling device. The valve body support flange attaches the valve body to the top wall. The pressure device urges the valve body to a closed position. The jet water expelling device diverts jet water from a water jet pump and opens the valve body using the jet water thus diverted, counteracting a pressing force of the pressure device and opening the valve body.