Lubricant composition and speed reducer using the same, and electrically operated power steering device using the same

Abstract

Disclosed are a lubricant composition obtained by adding a buffer particles having an average particle diameter D1 of 50 μm<D1≦300 μm to a lubricant, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus having the speed reduction gear incorporated therein, and noise produced in the speed reduction gear can be made lower than ever before irrespective of the magnitude of backlash in a case where a worm and a worm wheel are combined with each other and without complicating the configuration of the speed reduction gear by the buffer action of the buffer particles added to the lubricant composition, thereby making it possible to reduce noise produced in an automobile caused by the electric power steering apparatus at low cost.

Dependencies are inferred from the claim text.