Required information
The countershaft shown below is part of a speed-reducing compound gear train using 20° spur gears. A gear on the Input
shaft drives gear A with a 2 to 1 speed reduction. Gear B drives a gear on the output shaft with a 5 to 1 speed reduction.
The Input shaft runs at 1800 rev/min. All gears are to be of the same material. Since gear B is the smallest gear,
transmitting the largest load, it will likely be critical, so a preliminary analysis is to be performed on it. Use a module of
18.75 mm/tooth, a face-width of 4 times the circular pitch, a Grade 2 steel through-hardened to a Brinell hardness of 300,
and a desired life of 12 kh with a 98 percent reliability.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
$F_A = 11 kN$
Determine values for each of the following parameters. (You must provide an answer before moving to the next part.)
The transmitted load on gear B, $W_{tB}$, is ____ kN.
The pitch line velocity is ____ m/s.
