ALEXANDRIA, Va., Feb. 19 -- United States Patent no. 12,228,132, issued on Feb. 18.
"Variable displacement gerotor pump" was invented by Soon Gil Jang (Seoul, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "The movement of the moving gear meshed with the fixed gear in the casing changes the meshing width of the two gears, thereby changing the discharge amount of the pump. By installing a gear block inside the fixed gear, which is an internal gear, and a gear ring and gear ring cover on the outside of the moving gear, the fluid between the two gears is prevented from leaking to the outside. The fluid can pass between the two gears from or to the outside through the fluid holes in the fixed gear and...