Effective Length of Bush in Contact with Input Flange of Bushed Pin Coupling Calculator

Effective Length Formula:

\[ l_b = \frac{P}{D_b \times p_m} \]

Force on Each Rubber Bush or Pin:

Outer Diameter of Bush:

Pressure Intensity:

Tolerance:

Effective Length of Bush (m):

1. What is Effective Length of Bush in Contact with Flange?

Definition: This calculator determines the effective contact length between the bush and flange in a bushed pin coupling based on force, bush diameter, and pressure.

Purpose: It helps mechanical engineers design proper coupling interfaces that can withstand operational forces.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ l_b = \frac{P}{D_b \times p_m} \]

Where:

\( l_b \) — Effective length of bush (meters)
\( P \) — Force on each rubber bush or pin (Newtons)
\( D_b \) — Outer diameter of bush (meters)
\( p_m \) — Pressure intensity between flanges (Pascals)

Explanation: The force is distributed over the contact area (diameter × length) at a given pressure intensity.

3. Importance of Effective Length Calculation

Details: Proper length calculation ensures sufficient contact area to prevent excessive wear, deformation, or failure of the coupling.

4. Using the Calculator

Tips: Enter the force, bush diameter, pressure intensity, and optional tolerance (±5%). All values must be > 0 except tolerance.

5. Frequently Asked Questions (FAQ)

Q1: What is the purpose of the tolerance field?
A: The ±5% tolerance allows for design safety factors or manufacturing variations in the calculation.

Q2: How is pressure intensity determined?
A: Pressure intensity is typically specified by the coupling manufacturer based on material properties.

Q3: What's a typical bush diameter range?
A: Bush diameters commonly range from 20mm to 100mm (0.02m to 0.1m) depending on coupling size.

Q4: How does force affect the calculation?
A: Higher forces require either longer bush contact length, larger diameter, or higher pressure-resistant materials.

Q5: When would I use a negative tolerance?
A: Negative tolerance might be used for conservative designs or when material properties exceed minimum requirements.