Answer to Question #208089 in Mechanical Engineering for Sanajit

Question #208089

An epicyclic reduction gear has a shaft A fixed to arm B.The arm B has a pin fixed to its outer end and two heard C and E which are rigidly fixed,revolve on this pin. Gear C meshes with annular wheel D and gear E with pinion F.G is the driver pulley and D is kept stationary.The number of teeth are:D=80,C=10,E=24 and F=18.If the pulley G runs at 200r.p .m,find the speed of shaft A.



1
Expert's answer
2021-06-18T07:54:27-0400

Speed ratio

"\\frac{N_F}{N_D}=\\frac{N_F}{N_E}*\\frac{N_C}{N_D}"


"\\frac{N_F}{N_D}=\\frac{T_E}{T_F}*\\frac{T_D}{T_C}"


The relative velocity of gears with respect to the arm

"\\frac{N_F -N_{arm}}{N_D-N_{arm}}=-\\frac{T_E}{T_F}*\\frac{T_D}{T_C}"


"\\frac{200 -N_{A}}{0-N_{A}}=-\\frac{24}{18}*\\frac{80}{10}"


"\\frac{200 -N_{A}}{N_{A}}=\\frac{24}{18}*8"


"200-N_A=10.667 N_A"

"N_A=17.14 rpm" same direction as gear F


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