Radial Width of Piston Ring Calculator

Radial Width of Piston Ring Formula:

\[ b = D_i \times \sqrt{\frac{3 \times p_w}{\sigma_{tp}}} \]

Diameter of Cylinder Bore (D_i):

Allowable Radial Pressure on Piston Ring (p_w):

Permissible Tensile Stress for Ring (σ_tp):

Radial Width of Piston Ring (b):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Radial Width of Piston Ring?

The Radial Width of Piston Ring is the width of the piston ring in the radial direction. It is a critical dimension in engine design that affects sealing performance and durability of the piston ring assembly.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ b = D_i \times \sqrt{\frac{3 \times p_w}{\sigma_{tp}}} \]

Where:

\( b \) — Radial Width of Piston Ring (m)
\( D_i \) — Diameter of Cylinder Bore (m)
\( p_w \) — Allowable Radial Pressure on Piston Ring (Pa)
\( \sigma_{tp} \) — Permissible Tensile Stress for Ring (Pa)

Explanation: The formula calculates the appropriate radial width based on cylinder bore diameter, allowable radial pressure, and material tensile stress limits.

3. Importance of Radial Width Calculation

Details: Proper radial width calculation ensures optimal sealing performance, prevents excessive wear, and maintains engine efficiency. Incorrect width can lead to oil consumption issues, blow-by, and reduced engine performance.

4. Using the Calculator

Tips: Enter cylinder bore diameter in meters, allowable radial pressure in Pascals, and permissible tensile stress in Pascals. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is radial width important in piston ring design?
A: Radial width affects the contact pressure distribution, sealing effectiveness, and thermal conductivity between the ring and cylinder wall.

Q2: What factors influence allowable radial pressure?
A: Material properties, operating temperature, lubrication conditions, and engine speed all influence the allowable radial pressure.

Q3: How does cylinder bore diameter affect radial width?
A: Larger bore diameters generally require proportionally larger radial widths to maintain proper sealing pressure distribution.

Q4: What are typical values for permissible tensile stress?
A: Permissible tensile stress varies by material, typically ranging from 80-200 MPa for cast iron rings and up to 400 MPa for steel rings.

Q5: Can this formula be used for all piston ring types?
A: This formula is primarily for compression rings. Oil control rings may require different calculations due to their different functional requirements.