Patent ID: 7493837
Filing Date: 2009-02-24
Classification: F16C,F16H,Y10T

Abstract:
1. A partition room essentially made of an elastic material for setting a spacer ball of a ball screw unit for making rotational contact with two load carrying balls at two sides thereof, wherein said partition room is formed into two recesses to couple with the spherical surfaces of the adjacent load carrying balls, a hole communicating with said two recesses is opened through said partition room with its center aligned to the center of the line connecting the vertexes of said two recesses for filling said spacer ball into it, two openings of said hole communicating with said recesses have a diameter smaller than that of said spacer ball so that said spacer ball is able to make rotational contact with two adjacent load carrying balls to help them roll smoothly, wherein said hole for filling with said spacer ball is formed into an oblate ellipsoid with its major axis (length of the hole) being longer than the diameter of said spacer ball, while the minor axis (width of the hole) thereof is shorter.