Texts: A commercial enclosed gear drive consists of a 16-tooth helical pinion with a 20° normal pitch angle, a helix angle of 30°, and a normal diametral pitch of 6 teeth/in. The pinion drives a 48-tooth gear. The pinion speed is 300 rev/min and the face width is 2 in. The gears are grade 1 steel, through-hardened at 200 Brinell, made to number 6 quality standards, uncrowned, and are to be accurately and rigidly mounted. Assume a pinion life of 10 cycles and a reliability of 0.93.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Problem 14.022.a - Modification Factors for Pinion and Gear
If 5 hp is to be transmitted corresponding factors of safety for a pinion life of 108 cycles and a reliability of 0.93, determine the value of each of the following parameters:
a. Transverse diametral pitch, P
b. Pitch-line velocity, V
c. Transmitted load, wt
d. Pinion size factor, Ksp
e. Gear size factor, KsG
f. Reliability factor, YzKR
g. Stress-cycle factor, pinion, YNP
h. Stress-cycle factor, gear, YNG
(You must provide an answer before moving to the next part.)
The value of each of the parameters is as follows:
a. Transverse diametral pitch, Pt = 1.9 teeth/in
b. Pitch-line velocity, V = 2513 ft/min
c. Transmitted load, W = 7160 lb
d. Pinion size factor, Ksp = 1.335
e. Gear size factor, KsG = 4
f. Reliability factor, YzKR = 0.846
g. Stress-cycle factor, pinion, YNP = 0.9
h. Stress-cycle factor, gear, YNG = 60
