US Patent Issued to NTN on Oct. 14 for "Oil-impregnated sintered bearing and fluid dynamic bearing device provided with the bearing" (Japanese Inventors)

ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,442,414, issued on Oct. 14, was assigned to NTN Corp. (Osaka, Japan).

"Oil-impregnated sintered bearing and fluid dynamic bearing device provided with the bearing" was invented by Shinji Komatsubara (Mie, Japan), Fuyuki Ito (Mie, Japan) and Toshiaki Niwa (Mie, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An internal pore of a sintered metal bearing 8 is impregnated with a lubricating fluid, and a radial dynamic pressure generation portion 8a1 is formed on an inner peripheral surface 8a. An axial dimension L is 4.8 nm or less, a thickness dimension t is 0.5 mm or more and 1.5 nm or less, and a ratio L/D2 of the axial dimension L to an outer diame...