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:
Aug. 25, 2009
Filed:
May. 30, 2006
Hideo Fujita, Shizuoka-ken, JP;
Hideo Fujita, Shizuoka-ken, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka-ken, JP;
Abstract
A multiple cylinder engine includes a plurality of cylinders. Each cylinder includes a valve configured to open and close a port associated with each of the respective cylinders. The cylinders comprises at least a first cylinder group and a second cylinder group. A drive shaft is configured to rotate about an axis. A plurality of valve actuators are configured to transmit rotational movement of the drive shaft to the valve. A change mechanism comprises a control member that is configured to change a transmission state of the rotational movement transmitted from the drive shaft to the valve actuators. The change mechanism is configured to sequentially change an open period and a lift amount of each valve by changing a control amount of the control member. The control member is common to the first and second cylinder groups and the transmission states for the first cylinder group differs from the transmission states of the second cylinder group in accordance with the control amount of the control member. The valve open period and the lift amount of the valves in the first cylinder group is capable of being set to zero in a predetermined operational range to suspend operation of the first cylinder group.