Table 3.3

Note. Series 1 should be preferred to Series 2

3.2. Determine the nominal pitch circle diameter of the gear

.

3.3. Determine the face width of the gear

b^g = ψ _ba × a_w =0.5∙160=80 mm.

3.4. Determine the module according to the strength condition for bending

,

where K_m is taken as 6.8 for straight spur gears.

Obtained magnitude of the module should be rounded off to the greater side according to the standard series given in table 3.4. It is necessary to note that for general-purpose speed reducers the minimum value of the module is m_min = 2 mm. In our case we assume that
m = 2 mm.