Machine design $-$Case study

Gear trains are usually used to reduce speed between an input and output shafts. The gear train presented bellow consists of four gears. Gears $1$ and $2$ are helical while gears $3$ and $4$ are spur. As shown, all gears are keyed with shafts. Gear $1$ is connected to shaft a$,$ gears $2$ and $3$ are mounted on shaft $b,$ and gear $4$ is connected to the output shaft $c.$ we aim to design the following machine elements:

Gears $3$ and $4$

Shaft b

Bearings A and C

For this, the study is splitted into three main parts: Gears design; shaft design and bearings selection. A subset of pertinent design specifications that might be needed are summarized in the following table.

$\backslash$table$[[$Gears$,$Gear $1,P=3kW$

$m_n=5$

${}_1=1500re\frac{v}{m}in$

$N_1=24$

$=30$

${}_n=20$