ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,140, issued on Dec. 30, was assigned to NSK LTD. (Tokyo).
"Electric power steering device" was invented by Shigeo Shinohara (Gunma, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electric power steering device includes an assist pinion shaft, a worm wheel attached to an end part on the Z2 side of the assist pinion shaft, a worm shaft that has shaft teeth meshing with wheel teeth, and a casing that houses the worm shaft and the worm wheel. Among a plurality of parts of the wheel teeth, a first part is a part that meshes with the shaft teeth, and a second part is a part located on the opposite side of the first part with a central axis interp...