. Railway mechanical engineer . hich would resistan eccentric loading, its life would be limited by wear on theframe or on the frame protectors, when in place. Frame wearcannot at present be avoided because of the small clearance be-tween the frame and the drivers. The defects of the presentarrangement may be summed up as follows: Poor oiling facili-ties ; frame wear cannot be avoided because of the small clear-ance between the frame and the inside of the driver; non-flex-ibility in a transverse direction, except at the expense of bending tlie hanger directly and by eccentric loading; side mot
. Railway mechanical engineer . hich would resistan eccentric loading, its life would be limited by wear on theframe or on the frame protectors, when in place. Frame wearcannot at present be avoided because of the small clearance be-tween the frame and the drivers. The defects of the presentarrangement may be summed up as follows: Poor oiling facili-ties ; frame wear cannot be avoided because of the small clear-ance between the frame and the inside of the driver; non-flex-ibility in a transverse direction, except at the expense of bending tlie hanger directly and by eccentric loading; side motion of therigging will not tend to wear flat bearing surfaces, and the lifeof the hanger is limited by wear on the frame. In the arrangement shown in Fig. 12 the present tension ar-rangement is abandoned and a single member is placed on theinside of the frame, being subjected to direct tension and bend-ing. The pins are placed lengthwise with the frame to permitside movement. The wear of the members in Fig. 12 is such as Spring. ^Cup Fig. 13 Fig. 14 Suggested Designs for Siiort Hangersto eventually give a bearing as long as the boss. As the hangeris placed inside of the frame, the clearance between itself andthe frame can be made large enough to avoid wear. The stressin such a hanger would be: 12,000 X 8 = 96,000 in. lb. bending niunienlX 6= P — 96,00012 odulus — 8,000 lb. per sq. in. from bending 12,000 = lb. per sq in. 2X68,000 -I- 1,000 = 9,000 lb. per sq. direct ten SI mum tension If an I-section were used in Fig. 12, a larger section modulusCould be olitaincd, giving a lower stress for the same section area. Fig. 13 shows an arrangement which would give transverseflexibility to the short hangers when using the usual swordhanger. A ball bearing should be used on the front equalizingbeam, and the sword hangers connected to the transverse equal-izing beam should have freedom of movement. Fig. 14 showsan arrangement for using a ball bearing at the spring a
Size: 1795px × 1391px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
