Patent ID: 7594759
Filing Date: 2009-09-29
Classification: F16C,F16H

Abstract:
1. A method of imparting a preload to first and second ball bearings, which are each an oblique contact double row ball bearing, and said first and second ball bearings are axially arranged to have preload applied simultaneously thereto, the method comprising: providing said first ball bearing with first bearing first and second rows of balls wherein said first bearing first row of balls have a first bearing first pitch diameter and a first radial clearance α providing said second ball bearing with second bearing first and second rows of balls wherein said second bearing first row of balls have a second bearing first pitch diameter and a first radial clearance α arranging said first and second ball bearings on a common shaft to disposed sequentially said first bearing first row of balls, said first bearing second row of balls, said second bearing first row of balls, and said second bearing second row of balls; rotating said common shaft; measuring a rotation torque of said shaft; applying and increasing preload to said first and second bearings while measuring said rotation torque until a measured rotation torque enters a predetermined range such that: