Bending Moment In Crankweb Of Centre Crankshaft Due To Tangential Thrust For Maximum Torque Calculator

Formula Used:

\[ M_{bt} = P_t \times (r - \frac{d_c}{2}) \]

Tangential Force at Crank Pin (P_t):

Distance Between Crank Pin And Crankshaft (r):

Diameter of Crankshaft at Crankweb Joint (d_c):

Bending Moment in Crankweb Due to Tangential Force (M_bt):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Bending Moment in Crankweb Due to Tangential Force?

The bending moment in crankweb due to tangential force is the moment that tends to bend the crankweb when a tangential force is applied at the crank pin. This calculation is crucial for designing and analyzing the structural integrity of crankshafts in internal combustion engines.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ M_{bt} = P_t \times (r - \frac{d_c}{2}) \]

Where:

\( M_{bt} \) — Bending moment in crankweb due to tangential force (N·m)
\( P_t \) — Tangential force at crank pin (N)
\( r \) — Distance between crank pin and crankshaft (m)
\( d_c \) — Diameter of crankshaft at crankweb joint (m)

Explanation: The formula calculates the bending moment by multiplying the tangential force by the effective moment arm, which is the distance from the crank pin to the crankshaft minus half the crankshaft diameter at the joint.

3. Importance of Bending Moment Calculation

Details: Accurate calculation of bending moments is essential for ensuring the crankshaft can withstand operational stresses without failure. This helps in proper material selection, dimensioning, and fatigue analysis of crankshaft components.

4. Using the Calculator

Tips: Enter all values in appropriate units (Newtons for force, meters for distances). Ensure all input values are positive and within reasonable engineering limits for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the tangential force in crankshaft design?
A: The tangential force represents the component of the connecting rod force that contributes to torque production and creates bending stresses in the crankweb.

Q2: Why subtract half the crankshaft diameter in the formula?
A: This accounts for the fact that the bending moment is calculated at the centerline of the crankshaft, not at its outer surface.

Q3: What are typical values for these parameters in automotive engines?
A: Values vary significantly by engine size and type, but tangential forces can range from hundreds to thousands of Newtons, with distances typically in centimeters.

Q4: How does this bending moment affect crankshaft fatigue life?
A: Higher bending moments increase stress concentrations at the crankweb fillets, which can significantly reduce fatigue life if not properly designed for.

Q5: Should safety factors be applied to the calculated bending moment?
A: Yes, engineering safety factors should always be applied to account for dynamic loads, material variations, and other uncertainties in real-world operation.