1. What is Outer Diameter of Bush in Bushed Pin Coupling?

Definition: This calculator determines the outer diameter of a bush in a bushed pin coupling based on the applied force, bush length, and pressure intensity.

Purpose: It helps mechanical engineers and designers properly size bushings in flexible couplings to withstand operational forces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( D_b \) — Outer diameter of bush (meters)
• \( P \) — Force on each rubber bush or pin (Newtons)
• \( l_b \) — Effective length of bush (meters)
• \( p_a \) — Intensity of pressure between flange and bush (Pascals)

Explanation: The force is divided by the product of bush length and pressure intensity to determine the required outer diameter.

3. Importance of Bush Diameter Calculation

Details: Proper bush sizing ensures load distribution, reduces wear, and maintains coupling flexibility while preventing premature failure.

4. Using the Calculator

Tips: Enter the force in Newtons, effective length in meters, pressure intensity in Pascals, and tolerance percentage (default ±5%). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical pressure intensity for rubber bushes?
A: Common values range from 0.5-1.5 MPa (500,000-1,500,000 Pa) depending on rubber hardness and application.

Q2: Why include a tolerance percentage?
A: Manufacturing tolerances (±5% is common) account for material variations and ensure proper fit in the coupling.

Q3: How is effective length determined?
A: It's the axial length of the bush actually in contact with the coupling flange under load.

Q4: What affects bush diameter requirements?
A: Higher forces require larger diameters, while higher pressure ratings allow smaller diameters.

Q5: How does bush material affect calculations?
A: Material determines the allowable pressure intensity (pa) - harder materials can withstand higher pressures.

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