Inner Diameter of Bush on Piston Pin Calculator

Inner Diameter Formula:

\[ d_p = \frac{P_p}{l_p \times p_b} \]

Force on Piston Pin Bearing:

Length of Bush on Piston Pin:

Bearing Pressure:

Tolerance:

Inner Diameter (m):

Minimum Diameter (m):

Maximum Diameter (m):

1. What is Inner Diameter of Bush on Piston Pin?

Definition: This is the internal diameter of the bush used between the piston pin and piston pin bearing in an engine assembly.

Purpose: Proper calculation ensures optimal fit and reduces wear in the piston-connecting rod assembly.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ d_p = \frac{P_p}{l_p \times p_b} \]

Where:

\( d_p \) — Inner diameter of bush (meters)
\( P_p \) — Force on piston pin bearing (Newtons)
\( l_p \) — Length of bush on piston pin (meters)
\( p_b \) — Bearing pressure (Pascals)

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

3. Importance of Tolerance Calculation

Details: The ±5% tolerance accounts for manufacturing variations and thermal expansion in engine operation.

4. Using the Calculator

Tips: Enter the force, bush length, bearing pressure, and tolerance percentage (default ±5%). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: Why is tolerance important in bush diameter?
A: Tolerance ensures proper fit while accounting for thermal expansion and manufacturing variations.

Q2: What's a typical bearing pressure value?
A: Bearing pressure typically ranges from 10-25 MPa for automotive applications.

Q3: When would I change the tolerance percentage?
A: Adjust based on material properties, operating temperature range, and manufacturer specifications.

Q4: How do I find the force on piston pin bearing?
A: Calculate from engine combustion pressure or use manufacturer specifications.

Q5: Does this include wear allowance?
A: No, consider additional allowance for expected service life if needed.