ME 1352 DESIGN OF TRANSMISSION SYSTEMS （我1352传输系统的设计）.pdf

ME 1352 DESIGN OF TRANSMISSION SYSTEMS UNIT I DESIGN OF TRANSMISSION SYSTEMS FOR FLEXIBLE ELEMENTS PART-A 1. Define Law of belting. 2. State advantages and disadvantages belt drive over other drives. 3. In what ways the timing belts are superior to ordinary V-belts? 4. Derive the expression for tension ratio for V- belts. 5. What is slack adjuster? 6. Explain the term “Crowning of pulley”. Specify the purpose of it. 7. Define centrifugal tension in belt.. 8. Why V belts are preferred than flat belts? 9. Define creep slip in belts. 10. What is the effect of centre distance and diameter of pulley on the life of belts? 11. What is chordal action (Polygonal action) in chain drives? 12. What do you understand by simplex, duplex and triplex chain? 13. How is a wire rope specified? 14. Sketch and name different type of compound wire ropes. 15. Distinguish regular lay and long lay ropes. 16. Give some application of wire ropes. . PART-B 1. Design a flat belt drive to transmit 12KW @1000rpm. The centre distance is 2m and the speed ratio is 4. 2. A V-belt drive is to transmit 35 KW in a heavy duty saw mill which works 10 hours/day. The speed of motor shaft is 1440 rpm with the approximate speed reduction of 3.5 in the machine shaft. Design the drive and calculate the average stress induced in the belt. 3. Design a V-belt drive and calculate the actual belt tension and average stress for the following data. Driven pulley diameter, D= 550 mm, driver pulley diameter, d=175 mm, center distance c=1000 mm, speed of driver pulley = 1000 rpm and power, P = 7.5 kW. 4.. Design a chain drive to actuate a compressor from a 10 kW electric motor at 1000 rpm, the compressor runs at 300 rpm. Minimum centre distance should be 750 mm; the chain tension