Menu

Shaft with two keyways

Shaft_with_two_keyways
Shaft with two keyways

Values for calculation

$T$ $\mathrm{Nm}$
$r$ $\mathrm{mm}$
$a$ $\mathrm{mm}$
$b$ $\mathrm{mm}$
$L$ $\mathrm{mm}$
$G$ $\mathrm{MPa}$

Calculation

Coefficient $ C_1 $

$$C_1=0.7854$$

Coefficient $ C_2 $

$$C_2=-0.0795+0.1286\cdot\cfrac{a}{b}-0.1169\cdot\left(\cfrac{a}{b}\right)^2$$

Coefficient $ C_3 $

$$C_3=-1.4126-3.8589\cdot\cfrac{a}{b}+1.3292\cdot\left(\cfrac{a}{b}\right)^2$$

Coefficient $ C_4 $

$$C_4=0.7098+4.1936\cdot\cfrac{a}{b}-1.1053\cdot\left(\cfrac{a}{b}\right)^2$$

Coefficient $ C $

$$C=C_1+C_2\cdot\cfrac{b}{r}+C_3\cdot\left(\cfrac{b}{r}\right)^2+C_4\cdot\left(\cfrac{b}{r}\right)^3$$

Coefficient $ B_1 $

$$B_1=1.2512-0.5406\cdot\cfrac{a}{b}+0.0387\cdot\left(\cfrac{a}{b}\right)^2$$

Coefficient $ B_2 $

$$B_2=-0.9385+2.345\cdot\cfrac{a}{b}+0.3256\cdot\left(\cfrac{a}{b}\right)^2$$

Coefficient $ B_3 $

$$B_3=7.265-15.338\cdot\cfrac{a}{b}+3.1138\cdot\left(\cfrac{a}{b}\right)^2$$

Coefficient $ B_4 $

$$B_4=-11.152+33.71\cdot\cfrac{a}{b}-10.007\cdot\left(\cfrac{a}{b}\right)^2$$

Coefficient $ B $

$$B=B_1+B_2\cdot\cfrac{b}{r}+B_3\cdot\left(\cfrac{b}{r}\right)^2+B_4\cdot\left(\cfrac{b}{r}\right)^3$$

Polar moment of inertia

$$K=2\cdot C\cdot r^4$$

Angle of twist

$$θ=\cfrac{T\cdot 10^3\cdot L}{K\cdot G}$$

Torsion stress at $ M $

$$τ_{max-at-M}=\cfrac{10^3\cdot T\cdot B}{r^3}$$

Requirements

$$0.2 \le\cfrac{b}{r} \le 0.5$$$$0.5 \le\cfrac{a}{b} \le 1.5$$