TAILIEUCHUNG - Tribology Handbook 2E Episode 5

Tham khảo tài liệu 'tribology handbook 2e episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | B2 Roller chain drives Table Application factor f 1 Characteristics of driver Smooth running Slight shocks Moderate shocks Driven machine characteristics Electric motors. Steam and gas turbines. Internal combustion engines with hydraulic coupling. Internal combustion engines with 6 cyls or more with mechanical coupling. Electric motors with frequent starts. 2 per day Internal combustion engines with less than 6 cyls with mechanical coupling. Smooth running Centrifugal pumps and compressors. Printing machines. Paper calenders. Uniformly loaded conveyors. Escalators. Liquid agitators and mixers. Rotary driers. Fans. Moderate shocks Pumps and compressors 3 Cyls . Concrete mixing machines. Non uniformly loaded conveyers. Solid agitators and mixers. Heaiy shocks Planers. Excavators. Roll and ball mills. Rubber processing machines. Presses and shears. 1 2 cyl pumps and compressors. Oil drilling rigs. Factor ft takes account of any dynamic overloads depending on the chain operating conditions. The value of factor ft can be chosen directly or by analogy using Table . Table Tooth factor f2 for standard wheel sizes z. Ỉ2 15 17 19 21 23 25 The tooth factor f2 allows for the choice of a smaller diameter wheel which will reduce the maximum power capable of being transmitted since the load in the chain will be higher. Tooth factor f2 is calculated using the formula 19 -ỉ Note that this formula arises due to the fact that selection rating curves shown in Figure and Figure are those for a 19 tooth wheel . Recommended centre distances for drives 3 2 5 3 pitch ln . 8_ ạ__ ậ__ 4 rưcn mm 9 525 12 70 15 875 19 05 1 n H 1 2 4 3 25 40 31 75 38 10 44 45 50 80 63 50 76 20 mm 450 600 750 900 1000 1200 1350 1500 1700 1800 2000 Chain length calculation To find the chain length in pitches L for any contemplated centre distance of a two point adjustable drive use the following formula - z2-z y .

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