249 - Reactions at the bolts of speed reducer gear box
Problem 249
Fig. P-249 represents the top view of a speed reducer which is geared for a four to one reduction in speed. The torque input at the horizontal shaft C is 100 lb·ft. The torque output at the horizontal shaft D, because of the speed reduction, is 400 lb·ft. Compute the torque reaction at the mounting bolts A and B holding the reducer to the floor. Hint: The torque reaction is caused by the unbalanced torque, which is a couple.
![Top view of speed reduction gear box](http://www.mathalino.com/sites/default/files/images/249-speed-reducer-bx-top-view.gif)