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:
May. 05, 2020
Filed:
Jun. 23, 2015
Yamaha Hatsudoki Kabushiki Kaisha, Iwata-shi, Shizuoka, JP;
Yasuo Okamoto, Shizuoka, JP;
YAMAHA HATSUDOKI KABUSHIKI KAISHA, Shizuoka, JP;
Abstract
A valve gear for an engine includes a camshaft including a valve drive cam, a rocker arm, a synchronous cam that rotates in synchronism with the valve drive cam, and a switching mechanism that switches a drive mode of an intake valve or an exhaust valve in a period defined by the synchronous cam. The switching mechanism includes a switch and a driver. The switch switches the drive mode by moving elements which define a valve gear system from the valve drive cam to the rocker arm. The driver includes a cam follower that is pushed by the synchronous cam and drives the elements of the valve gear system in directions to switch the drive mode by a force received from the cam follower. A period when the synchronous cam pushes the cam follower is a period when the intake valve or the exhaust valve is kept closed.