ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,535,124, issued on Jan. 27, was assigned to CHUAN HONG PRECISION TOOL MANUFACTURING Co. LTD. (Kaohsiung, Taiwan).
"Planetary roller screw" was invented by San-Kuei Wu (Kaohsiung, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A planetary roller screw adapted for solving insufficient structural strength of the conventional planetary roller screw while proceeding with precise motion control is disclosed. The planetary roller screw includes a main screw having an external thread, a nut having an internal thread, and a planetary assembly having rollers. Each roller includes an outer periphery having an external thread. The pitches of the external thr...