ALEXANDRIA, Va., June 12 -- United States Patent no. 12,297,756, issued on May 13, was assigned to SUZUKI MOTOR Corp. (Hamamatsu, Japan).
"Variable valve device" was invented by Hisashi Ozeki (Hamamatsu, Japan) and Daisuke Maeda (Hamamatsu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A variable valve device changes a valve lift amount in a cylinder head. The device includes: a camshaft having plural cams with different valve lift amounts; plural rocker arms in contact with the plural cams to move a valve; a switching mechanism that couples and separates the rocker arms by oil pressure; and an oil control valve that controls the oil pressure. The switching mechanism includes a hydraulic piston moveab...