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:
Dec. 04, 2001
Filed:
Aug. 22, 2000
Applicant:
Inventor:
Tomotaka Takano, Iwata, JP;
Assignee:
Yamaha Hatsudoki Kabushiki Kaisha, Iwata, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01L 1/344 ;
U.S. Cl.
CPC ...
F01L 1/344 ;
Abstract
A variable valve timing mechanisms for an internal combustion engine wherein the timing of two cam shafts associated with the same combustion chamber of the engine may be driven at the same time interval and at the same speed from the engine output shaft and both cam shafts may have their timing adjusted simultaneously by a first variable valve timing mechanism and only one of the cam shafts may have its timing adjusted relative to the other cam shaft by a second variable valve timing mechanism to provide a simpler operational control and lower cost assembly. The variable valve timing cam drive arrangement also reduces the loading on the cam shaft bearings.