並列タイトル等Effect of Outer Race Misalignment on the High Speed Performance of Ball Bearings
タイトル（掲載誌）航空宇宙技術研究所報告 = Technical Report of National Aerospace Laboratory TR-786
一般注記For rolling bearings to operate at peak performance, it is necessary to mount the inner and outer races accurately against the axis of rotation. However, because of the lack of required precision of the housing and the axis, the misalignment of bearings, etc., bearigs are sometimes used with the inner and outer race tilted. Misalignment of rolling beatings greatly affect their high speed performance such as bearing friction and bearing life. Experiments were conducted to determine the allowable limiting dn values and the running performance of deep-groove ball bearings(type#6220) operating at dn values ranging from 0.5×10(exp 6) to 2.25×10(exp 6) under a thrust load of 1,000 kgf. Bearing frictional torque, bearing temperature rise and contact electric resistance were measured at various tilt angles of outer race with respect to inner race. The main results obtained are as follows; 1)The limiting dn value(the dn value at which the bearing frictional torque increased suddenly.) decreases greatly with a slight tilt of the outer race in high speed ball bearings. 2)In the case of an outer ring guided cage type bearing, the lubrication of the race riding surface of the cage restrains the limiting dn value. 3)A bearing with a silver-plated retainer is allowable up to a tilt of δ=0.15mm(9×10(exp -4)rad.) at dn 2.25×10(exp 6), showing that it is effective in preventing instantaneous seizure. 4)On the other hamd, with a nonsilver-plated cage, a slight increase in the tilt of the bearing outer race causes a sudden rise in friction torque and thus leads to seizure at high speeds. The allowable tilt was less than δ=0.1mm(6×10(exp -4)rad.).
資料番号: NALTR0786000
レポート番号: NAL TR-786
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
提供元機関・データベース宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ