Machine Design Databook Episode 2 part 8

Tham khảo tài liệu 'machine design databook episode 2 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | FLEXIBLE MACHINE ELEMENTS FLEXIBLE MACHINE ELEMENTS TABLE 21-21 Number of arms in mild steel pulley Diameter mm Details of spokes No. Of diameter 250-500 6 19 560-710 8 19 800-1000 10 22 1120 12 22 1250 14 22 1400 16 22 1600 18 22 1800 18 22 2000 22 22 Source IS 1691 1968. Particular Formula Mild Steel Pulley Minimum length of boss Fig. 21-3 l a 2 21-28 100 mm for 19-mm-diameter spokes 138 mm for 22-mm-diameter spokes t 5 mm for diameters from 400 to 2000 mm The thickness of rim FIGURE 21-3 Mild steel pulley. t 200 0 003m SI 21-29a t Zu 0 12in for single belt USCS 21-29b t 200 0 006 m SI 21-29c t 0 24 in for double belt USCS 21-29d The crown height Arms for mild steel pulleys Refer to Tables 21-16 21-17A and 21-17B. Refer to Table 21-21. Downloaded from Digital Engineering Library @ McGraw-Hill Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any Use is subject to the Terms of Use as given at the website. FLEXIBLE MACHINE ELEMENTS CHAPTER TWENTY-ONE Particular Formula V-BELT The formula to obtain the maximum power in kilowatt which the V-belts of sections A B C D and E can transmit Table 21-22 and 21-23 Belt Max. value of dc mm SI cross section Power rating per strand kW A 3 P v -- de 104 J 125 21-30 B P v ÌỊL ILỴ de 104 J 175 21-31 C 5 P v v de 104 300 21-32 D 5 P v v de 104 425 21-33 E 952 P v _ __L . de 104 J 700 21-34 where P maximum power in kW at 1808 arc of contact for a belt of average length The equivalent pitch diameter de dpFb 21-35 Refer to Table 21-24 for Fb the small-diameter factor. TABLE 21-22 Classification of V-belts Cross-sectional symbol Nominal top width W mm Nominal thickness T mm A 13 8 B 17 11 C 22 14 D 30 12 E 33 23 Source IS 2494 1964. Incorrect Incorrect Correct Downloaded from Digital Engineering Library @ McGraw-Hill Copyright .