Permissible Intensity of Pressure between Flange and Rubber Bush of Coupling given Torque Calculator

Pressure Intensity Formula:

\[ P = \frac{2 \times T}{D_b \times N \times D_p \times L_b} \]

Torque Transmitted By Coupling (T):

N·m

Outer Diameter of Bush (D_b):

Number of Pins (N):

Pitch Circle Diameter of Pins (D_p):

Effective Length of Bush (L_b):

Tolerance:

Pressure Intensity (P): Pa

With Tolerance (±5%): Pa

1. What is Permissible Intensity of Pressure between Flange and Rubber Bush?

Definition: This is the maximum allowable pressure that can be exerted between the flange and rubber bush in a coupling without causing failure or excessive wear.

Purpose: It helps mechanical engineers design couplings that can safely transmit torque without damaging the rubber bush components.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P = \frac{2 \times T}{D_b \times N \times D_p \times L_b} \]

Where:

\( P \) — Pressure intensity (Pascals)
\( T \) — Torque transmitted by coupling (N·m)
\( D_b \) — Outer diameter of bush (m)
\( N \) — 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 pressure distribution across the contact surface between the flange and rubber bush based on the transmitted torque and coupling geometry.

3. Importance of Pressure Calculation

Details: Proper pressure calculation ensures the rubber bush won't fail under load, maintains coupling integrity, and prevents premature wear of components.

4. Using the Calculator

Tips: Enter the torque value, bush diameter, number of pins, pitch circle diameter, bush length, and tolerance percentage. All dimensional values must be in meters.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical tolerance value?
A: ±5% is common, but this may vary based on material specifications and application requirements.

Q2: How do I determine the effective length of bush?
A: This is the actual contact length between the flange and bush under operating conditions.

Q3: What if my pressure exceeds material limits?
A: Consider increasing bush diameter, using more pins, or selecting a bush material with higher pressure rating.

Q4: Does this account for dynamic loads?
A: No, this is for static calculations. For dynamic conditions, apply appropriate safety factors.

Q5: What's a typical pressure range for rubber bushes?
A: Most rubber bushes can handle 1-5 MPa, but consult manufacturer specifications for exact values.