| 摘要 |
PROBLEM TO BE SOLVED: To obtain a bearing unit capable of keeping the least setting length of a compression coil spring giving preload onto a pair of outer bearing rings without decrease in a wire diameter and winding the number of turns and easily realizing pulling-in and out of a holding plate during assembling work body means of compression of the compression coil spring. SOLUTION: In the bearing unit 21 arranging the compression coil spring 22 between a pair of the outer bearing right 5 and 7 rotatably supporting a shaft 3 via rolling bodies 4a and 4b, the compression coil spring 22 is provided with a winding diameter changing section changing a winding diameter by a difference two times as much as or more than an outer diameter of a wire material during winding so that a part of winding wire is housed inside other winding wire while compressed. COPYRIGHT: (C)2003,JPO
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