The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2007
Filed:
Mar. 17, 2006
Hiroshi Iwakami, Saitama, JP;
Atsushi Kusuda, Saitama, JP;
Masahiko Tsuchiya, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A propulsion unit for a boat has a cooling water intake structure through which entry of cooling water is obstructed when the boat is towed while the impeller is not turned, and through which sufficient cooling water enters when the impeller is turned. The propulsion unit includes an impeller, plural stationary blades provided on the downstream side of the impeller, and a cooling water intake structure. The intake structure is disposed between adjacent first and second stationary blades, on the side of the first stationary blade relative to a bisecting line between the two stationary blades. Hydraulic pressure on the side of the first stationary blade, relative to the bisecting line, is lowered by guide action of the impeller, and hydraulic pressure on the side of the second stationary blade relative to the bisecting line is raised, respectively, when the boat is towed while the impeller is stopped.