PSYC 2000 Chapter : Modules 1 3
Document Summary
Contact ratio: m l c ab p b. See the following figure for a drawing of the gears and the arc lengths. Eq. (13-7): p nb p n cos n. 1 n tan (tan 25 / cos 30 ) 28. 3. 7. 854 p n cos p t tan m n cos cos 30. Using eq. (13-11) with k = 1, = 20 , and m = 2, (a) Repeating (a) with m = 3, np = 14. 98 teeth. Repeating (a) with m = 4, np = 15. 44 teeth. Repeating (a) with m = 5, np = 15. 74 teeth. Alternatively, a useful table can be generated to determine the largest gear that can mesh with a specified pinion, and thus also the maximum gear ratio with a specified pinion. The max ng column was generated using eq. (13-12) with k = 1, = 20 , and rounding up to the next integer.
