. Railway mechanical engineer . cent find in a bearing with long cylindrical steel rollersbetween and per cent. The coefficient of friction in aball bearing is to per cent. The increased friction Fig. 2 of the roller bearing is due to the fact that the rollers tendto go crosswise, thus setting up a sliding motion. It istherefore desirable that the rollers in a roller bearing shouldbe self-alined and, with this in mind, the so-called disk bear-ing manufactured by the Nordiska Kulluager Aktiebolaget(Northern Ball Bearing Company), Gothenburg, Sweden,was designed. It has b
. Railway mechanical engineer . cent find in a bearing with long cylindrical steel rollersbetween and per cent. The coefficient of friction in aball bearing is to per cent. The increased friction Fig. 2 of the roller bearing is due to the fact that the rollers tendto go crosswise, thus setting up a sliding motion. It istherefore desirable that the rollers in a roller bearing shouldbe self-alined and, with this in mind, the so-called disk bear-ing manufactured by the Nordiska Kulluager Aktiebolaget(Northern Ball Bearing Company), Gothenburg, Sweden,was designed. It has been found that rollers of the formshown in Fig. 1 when moving between two planes have apeculiar rolling motion. Provided the upper plane canrise and fall, the horizontal axis will assume a normal posi-tion at right angles to the direction of motion. This alsoholds true when the disks move between round and not be-tween plane surfaces, as in the disk bearing. By the formof roller shown, the strength of the roller bearing is com-. Fig. 3—Journal Box With Disc Bearings Used On the Swedish State Railways bined with the easy running of the ball bearing, the effectivecapacity of the disc being the same as for a ball of thediameter shown by the dotted lines. The arrangement of the rollers or disks, as they are called,with the races and cage, is shown in Fig. 2. The racerings have concave grooves which conform fairly closely tothe outline of the disks. As any axial displacement of theouter ring tends to compress the roller, such a bearing is ableto carry a thrust load. Due to the self-alining feature, thedisks adjust themselves at an angle so that the resultantpressure is normal to the axis of the disk. If the axial stressarises suddenly, the disk does not immediately adjust itself,but takes the stress nevertheless. The cage for disk bear-ings is so formed that the disks can adjust themselves underthe influences of axial pressure. The load capacity of the disk bearing is stated to be
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
