Outer Diameter of Bush in Bushed Pin Coupling given Torque and Effective Length Calculator

Outer Diameter of Bush Formula:

\[ D_b = \frac{2 \times M_t}{p_a \times N \times D_p \times l_b} \]

Torque Transmitted By Coupling:

Intensity of Pressure:

Number of Pins in Coupling:

Pitch Circle Diameter of Pins:

Effective Length of Bush:

Outer Diameter of Bush (m):

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

Definition: This calculator determines the required outer diameter of the bush in a bushed pin coupling based on transmitted torque, pressure intensity, number of pins, and bush dimensions.

Purpose: It helps mechanical engineers design properly sized bushings that can withstand the transmitted torque without excessive wear.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ D_b = \frac{2 \times M_t}{p_a \times N \times D_p \times l_b} \]

Where:

\( D_b \) — Outer diameter of bush (meters)
\( M_t \) — Torque transmitted by coupling (Nm)
\( p_a \) — Intensity of pressure (Pa)
\( N \) — Number of pins in coupling
\( D_p \) — Pitch circle diameter of pins (m)
\( l_b \) — Effective length of bush (m)

Explanation: The formula calculates the minimum required bush diameter to distribute the torque load across all pins without exceeding the allowable pressure.

3. Importance of Bush Diameter Calculation

Details: Proper bush sizing ensures even load distribution, prevents premature wear, and maintains coupling alignment under operational torque.

4. Using the Calculator

Tips: Enter torque value, pressure intensity (default 1.01 MPa), number of pins (default 6), pitch diameter, and bush length. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is pressure intensity important?
A: It determines the maximum load the bush material can withstand without excessive deformation or wear.

Q2: How does number of pins affect the calculation?
A: More pins distribute the load better, allowing for smaller bush diameters.

Q3: What's a typical pressure intensity value?
A: For rubber bushes, it's typically around 1 MPa, but varies by material.

Q4: How precise should the pitch diameter be?
A: Very precise - small errors can significantly affect load distribution.

Q5: Does this include safety factors?
A: No, the calculated diameter should be increased by an appropriate safety factor.