Subtopic: Calculation of power, torque, fuel consumption, heat load and power losses
Question Statement:
A tractor is equipped with twin internal expanding shoe drum brakes of $300\text{ mm}$ internal drum diameter. If the total tangential braking force developed at the drum circumference is $4.5\text{ kN}$ on each wheel, calculate the total braking torque developed by both rear wheels combined in $\text{N}\cdot\text{m}$.
Answer Key:
1350
Step-by-Step Solution & Explanation
Drum radius $R = \frac{0.30}{2} = 0.15\text{ m}$.
Braking torque per wheel:
$T_1 = F_t \times R = 4500\text{ N} \times 0.15\text{ m} = 675\text{ N}\cdot\text{m}$
For both wheels:
$T_{\text{total}} = 2 \times 675 = 1350\text{ N}\cdot\text{m}$