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:
Feb. 15, 2005
Filed:
Oct. 02, 2000
Tetsuya Mashiko, Shizuoka, JP;
Takeshi Hirasawa, Shizuoka, JP;
Tetsuya Mashiko, Shizuoka, JP;
Takeshi Hirasawa, Shizuoka, JP;
Yamaha Marine Kabushiki Kaisha, Shizuoka, JP;
Abstract
A multiple valve engine for a watercraft includes an improved construction that contributes in balancing the weight of the engine between the port and starboard sides of the watercraft hull. The hull defines a center plane extending generally vertically from bow to stern. The engine includes a cylinder body defining at least one cylinder bore. An axis of the cylinder bore is inclined from the center plane. At least two intake passages communicate with a combustion chamber. Intake valves are arranged to selectively connect and disconnect the intake passages with the combustion chamber. At least one exhaust passage communicates with the combustion chamber. In one mode of the invention, the number of exhaust passages in the engine is less than the number of intake passages. At least one exhaust valve is arranged to selectively connect and disconnect the exhaust passage with the combustion chamber. The intake valves lie closer to the center plane than does the exhaust valve(s).