Patent ID: 6170146
Filing Date: 2001-01-09
Classification: H01R,Y10T

Abstract:
A rotor assembling method comprising the steps of:forming a first shaft hole at the center of an armature core with salient poles on which coils are wound;forming through-holes in said armature coil equidistantly arranged along a circumference which is coaxial with said first shaft hole; forming a second shaft hole at the center of a commutator unit, said commutator unit comprising a plurality of equally segmented commutator pieces erect in an axial direction and arranged along a circumference which is coaxial with said second shaft hole, risers electrically continuous with said commutator pieces, and a commutator holder for holding said commutator pieces and said risers;forming engaging portions in said commutator unit at positions corresponding to said through-holes of said armature core;inserting a rotary shaft into and through said first shaft hole of said armature core and fixing said rotary shaft therein;mounting the armature core on a supporting jig having at least one positioning pin having a guide portion at a free end; andassembling said armature core and said commutator unit to form a rotor assembly by inserting the positioning pin into one of said through-holes of said armature core from one side of said one of said through-holes, and bringing at least one of said engaging portions into engagement with the positioning pin protruded above the other side of said one of said through-holes so that said armature core is positioned relative to said commutator unit, fixing said commutator unit onto said shaft, and connecting said users to said coils; andremoving said support jig from said rotor assembly.