Method of assembling a motor with ball bearings

摘要

Cup ring 8 and holding-plate 11, disposed at each side of front bracket 7, sandwich tightly an outer ring of front ball-bearing 10 in order to prevent creep between a bearing housing and the outer ring. A thickness of bearing shim 12 is adjusted such that an axial clearance between the front ball-bearing and a rear ball-bearing falls within a range from 0.02 to 0.1 mm. Holding plate 11 is temporarily fixed to a given place of motor shaft 1, then screwed down thereto with screw 14, so that plate 11 moves and solidly contacts with the outer ring of front ball bearing 10. An outer diameter of shaft 1 extending between the given place and bearing 10 is smaller than a center hole of holding plate 11, thus plate 11 does not touch shaft 1.