Question

mechanical engineering design

Problem #2: A pair of helical gears have a module in the normal plane of 5 mm, a normal pressure angle of 20, and a helix angle of 35. The gears mesh with parallel shafts and have 32 and 52 teeth. Determine the transverse module, the pitch diameters, the center distance, and the minimum face width.

Answer 1

Given : normal pressure angle (an) = 20° helix. angle (P) = 350 normal module (mn) = 5mm No. of tee the = z; , Z₂ : : . 2,= 32 Z2 - 52 . bransverse module (me) = no ransverse es 20 Imi = 6.104 mm

Pitch diameter (d) = Zmn = zme cos do = zime = 32X6.104 - 195.32 mmi d₂ = 2zm = 52% 6.104 317.40mm Centre distance = (3472) mm 2 cosB (32+52 x 5 2 cos 35. = 25.6.36 mm Minimum face width = 2.3. mał tan ß = 2.3 x5 x T tan 350 = 51.6 mm