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Number of Bushes or Pins in Terms of Effective Length of Bush and Torque in Bush Pin Coupling Calculator

Number of Pins Formula:

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

N·m
m
Pa
m
m
%

1. What is Number of Pins in Bush Pin Coupling Calculator?

Definition: This calculator determines the number of bushes or pins required in a bush pin coupling based on torque transmission and coupling dimensions.

Purpose: It helps mechanical engineers design bush pin couplings with the optimal number of pins for torque transmission requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

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

Where:

  • \( N \) — Number of pins in coupling
  • \( M_t \) — Torque transmitted by coupling (N·m)
  • \( D_b \) — Outer diameter of bush (m)
  • \( p_a \) — Pressure intensity between flange and bush (Pa)
  • \( D_{pins} \) — Pitch circle diameter of pins (m)
  • \( l_b \) — Effective length of bush (m)

3. Importance of Pin Calculation

Details: Proper pin calculation ensures the coupling can handle the required torque without failure while maintaining design efficiency.

4. Using the Calculator

Tips: Enter torque, bush diameter, pressure intensity, pitch diameter, bush length, and tolerance percentage. All dimensional values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical tolerance for pin count?
A: ±5% is common, but this can vary based on application requirements.

Q2: How does bush diameter affect pin count?
A: Larger bush diameters typically require fewer pins for the same torque transmission.

Q3: What's a typical pressure intensity value?
A: Around 1.01 MPa (1,010,000 Pa) is common, but varies with material and design.

Q4: Why do we need pitch circle diameter?
A: This determines the moment arm for torque transmission calculations.

Q5: How is effective bush length determined?
A: It's the actual contact length between bush and flange under load.

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