To prevent side run-out, by applying an outer race preload to ball bearings by using a wave washer.
A bearing unit 1 includes a rotary shaft 40, a pair of ball bearings 41 and 41, a spacer 42 sandwiched between inner races 41a and 41a, receiving parts 43 and 43 respectively arranged on opposed surfaces 41c and 41c of outer races 41b and 41b, and the wave washer 44 for applying the outer race preload to the ball bearings 41 and 41. The spacer 42 is sandwiched between the opposed surfaces 41c and 41c of the inner races 41a and 41a, and the mutual receiving parts 43 and 43 are pressed by the wave washer 44 arranged between the opposed surfaces 41c and 41c of the outer races 41b and 41b while positioning the inner races 41a and 41a in the axial direction of a rotary shaft 40 so as to have a predetermined interval on the opposed surfaces 41c and 41c of the outer races 41b and 41b, and a preload can be applied to the outer races by pressing the outer races 41b and 41b in the direction for push-expanding the mutual outer races 41b and 41b via the receiving parts 43 and 43.
KITAKAZE KAKEI
Seiji Iga
Toshiya Fujii
Nobuhiro Noguchi
Yusei Atsuya
Next Patent: PIPE VIBRATION DAMPING STRUCTURE AND PIPE VIBRATION DAMPING METHOD