Question

4. A spur gear has 22 teeth of the 20° full depth involute form and a diametral pitch of 1.75. Compute the circular pitch, the addendum, the dedendum, the pitch circle diameter, the whole depth of a tooth, the clearance, outside diameter, and the base circle diameter.

Answer 1

DATE : : Given datar T = 22 teeth diametrical dp = 1.75 pitch diametrical pitch is given by dp = 1 / I - is pitch dia - - 12.57 22 175 Circular pitch p is given by P= T - 1795 1.75 Now, addendum a. is given by

DATE : : C- 0. 571 dpi 175 Now, deddendumd is given by da 1.25 de 0.714 -1.25 1.75 Now whole depth of tooth ht, is given by ht= 2.25 de = 2.25 1.75 = 1.285 Now clearance, c C: 0.25 is given 0.25 by 0.142

DATE : : - - - - 1. 795 057 0.714 12. 57 circular pitch addendum dedendum pitch circle dia whole depth clearance outside dia base dia 1-285 0.142 13.174 a 11.142