1. What is Bending Moment at Crankshaft Under Flywheel?

The Bending Moment at Crankshaft Under Flywheel is the bending moment at the central plane of the crankshaft when an external force or moment is applied to the crankshaft causing it to bend. This is a critical parameter in crankshaft design and analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( M_b \) — Bending Moment at Crankshaft Under Flywheel (N·m)
• \( R_b \) — Resultant Reaction on CrankShaft Bearing (N)
• \( c_g \) — Centre Crankshaft Bearing Gap From Flywheel (m)

Explanation: The bending moment is calculated by multiplying the resultant reaction force on the crankshaft bearing by the distance from the bearing to the flywheel center.

3. Importance of Bending Moment Calculation

Details: Accurate bending moment calculation is crucial for crankshaft design, stress analysis, and ensuring structural integrity under maximum torque conditions. It helps determine the required material strength and dimensions.

4. Using the Calculator

Tips: Enter the resultant reaction force in Newtons and the bearing gap distance in meters. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is bending moment calculation important in crankshaft design?
A: Bending moment calculation helps ensure the crankshaft can withstand the mechanical stresses during operation, preventing failure and ensuring reliability.

Q2: What factors affect the bending moment at the crankshaft?
A: The bending moment is primarily affected by the reaction forces at the bearings and the distance between the bearing and the point of force application.

Q3: How is the resultant reaction force determined?
A: The resultant reaction force is typically calculated from the dynamic forces acting on the crankshaft, including combustion forces, inertial forces, and flywheel weight.

Q4: What are typical values for crankshaft bending moments?
A: Bending moment values vary significantly depending on engine size, design, and operating conditions. They are typically in the range of hundreds to thousands of Newton-meters.

Q5: How does this calculation relate to crankshaft fatigue analysis?
A: The bending moment is a key input for stress calculations and fatigue analysis, helping determine the crankshaft's service life under cyclic loading conditions.