Length of Piston Skirt given Allowable Bearing Pressure Calculator

✖Coefficient of Friction for Piston Skirt is the ratio of the side thrust on the liner to the maximum gas load on the piston.ⓘ Coefficient of Friction for Piston Skirt [μ]			+10% -10%
✖Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder.ⓘ Diameter of Cylinder Bore [D_i]			+10% -10%
✖Maximum gas pressure inside cylinder is the maximum amount of pressure that can be generated inside the cylinder.ⓘ Maximum Gas Pressure inside Cylinder [p_max]			+10% -10%
✖Bearing Pressure for Piston Skirt is the compressive force acting on the contact area between two components having relative motion between them.ⓘ Bearing Pressure for Piston Skirt [P_b]			+10% -10%

✖Length of piston skirt is the total length of a piston skirt used for bearing side thrust.ⓘ Length of Piston Skirt given Allowable Bearing Pressure [l_s]

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Formula

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Length of Piston Skirt given Allowable Bearing Pressure

Formula

`"l"_{"s"} = "μ"*pi*"D"_{"i"}*"p"_{"max"}/(4*"P"_{"b"})`

Example

`"50.60791mm"="0.1"*pi*"180mm"*"1.43191084N/mm²"/(4*"0.4N/mm²")`

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Length of Piston Skirt given Allowable Bearing Pressure Solution

STEP 0: Pre-Calculation Summary

Formula Used

Length of Piston Skirt = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore*Maximum Gas Pressure inside Cylinder/(4*Bearing Pressure for Piston Skirt)
l_s = μ*pi*D_i*p_max/(4*P_b)
This formula uses 1 Constants, 5 Variables

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Length of Piston Skirt - (Measured in Meter) - Length of piston skirt is the total length of a piston skirt used for bearing side thrust.
Coefficient of Friction for Piston Skirt - Coefficient of Friction for Piston Skirt is the ratio of the side thrust on the liner to the maximum gas load on the piston.
Diameter of Cylinder Bore - (Measured in Meter) - Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder.
Maximum Gas Pressure inside Cylinder - (Measured in Pascal) - Maximum gas pressure inside cylinder is the maximum amount of pressure that can be generated inside the cylinder.
Bearing Pressure for Piston Skirt - (Measured in Pascal) - Bearing Pressure for Piston Skirt is the compressive force acting on the contact area between two components having relative motion between them.

STEP 1: Convert Input(s) to Base Unit

Coefficient of Friction for Piston Skirt: 0.1 --> No Conversion Required
Diameter of Cylinder Bore: 180 Millimeter --> 0.18 Meter (Check conversion here)
Maximum Gas Pressure inside Cylinder: 1.43191084 Newton per Square Millimeter --> 1431910.84 Pascal (Check conversion here)
Bearing Pressure for Piston Skirt: 0.4 Newton per Square Millimeter --> 400000 Pascal (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

l_s = μ*pi*D_i*p_max/(4*P_b) --> 0.1*pi*0.18*1431910.84/(4*400000)

Evaluating ... ...

l_s = 0.0506079064748204

STEP 3: Convert Result to Output's Unit

0.0506079064748204 Meter -->50.6079064748204 Millimeter (Check conversion here)

FINAL ANSWER

50.6079064748204 ≈ 50.60791 Millimeter <-- Length of Piston Skirt

(Calculation completed in 00.004 seconds)

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Shri Govindram Seksaria Institute of Technology and Science (SGSITS ), Indore

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< 8 Piston Skirt Calculators

Length of Piston Skirt given Allowable Bearing Pressure

Go Length of Piston Skirt = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore*Maximum Gas Pressure inside Cylinder/(4*Bearing Pressure for Piston Skirt)

Side Thrust on Piston

Go Side thrust on piston = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore^2*Maximum Gas Pressure inside Cylinder/4

Length of Piston Skirt given Side Thrust

Go Length of Piston Skirt = Side thrust on piston/(Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore)

Side Thrust on Piston Skirt

Go Side thrust on piston = Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore*Length of Piston Skirt

Total Length of Piston

Go Length of Piston = Width of Top Land+Length of Ring Section of Piston+Length of Piston Skirt

Minimum Length of Piston Skirt

Go Length of Piston Skirt = 0.65*Diameter of Cylinder Bore

Maximum Length of Piston Skirt

Go Length of Piston Skirt = 0.8*Diameter of Cylinder Bore

Maximum Total Length of Piston

Go Length of Piston = 1.5*Diameter of Cylinder Bore

Length of Piston Skirt given Allowable Bearing Pressure Formula

Length of Piston Skirt = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore*Maximum Gas Pressure inside Cylinder/(4*Bearing Pressure for Piston Skirt)
l_s = μ*pi*D_i*p_max/(4*P_b)

Piston Skirt

Piston skirt is fitted in both two-stroke and four-stroke engines. It has a different function for different engines. In large crosshead, two-stroke engines with uni-flow scavenging these skirts are short in length and are fitted to act as a guide and to stabilize the position of the piston inside the liner. It is generally made of cast iron. The diameter of the skirt is usually kept slightly larger than that of the piston. This is done to prevent damage to the liner surface due to the piston movement.
Soft bronze rings are also fitted in piston skirts. These bronze rings help during the running-in of the engine when the engine is new and can be replaced if necessary. In two-stroke engines having loop or cross scavenging arrangements the skirts are slightly larger as these helps in blanking off the scavenge and the exhaust ports in the liner.

How to Calculate Length of Piston Skirt given Allowable Bearing Pressure?

Length of Piston Skirt given Allowable Bearing Pressure calculator uses Length of Piston Skirt = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore*Maximum Gas Pressure inside Cylinder/(4*Bearing Pressure for Piston Skirt) to calculate the Length of Piston Skirt, Length of piston skirt given allowable bearing pressure is the length of the piston skirt, the cylindrical portion of the piston between the last scrapper ring and the open-end. Length of Piston Skirt is denoted by l_s symbol.

How to calculate Length of Piston Skirt given Allowable Bearing Pressure using this online calculator? To use this online calculator for Length of Piston Skirt given Allowable Bearing Pressure, enter Coefficient of Friction for Piston Skirt (μ), Diameter of Cylinder Bore (D_i), Maximum Gas Pressure inside Cylinder (p_max) & Bearing Pressure for Piston Skirt (P_b) and hit the calculate button. Here is how the Length of Piston Skirt given Allowable Bearing Pressure calculation can be explained with given input values -> 49946.3 = 0.1*pi*0.18*1431910.84/(4*400000).

FAQ

What is Length of Piston Skirt given Allowable Bearing Pressure?

Length of piston skirt given allowable bearing pressure is the length of the piston skirt, the cylindrical portion of the piston between the last scrapper ring and the open-end and is represented as l_s = μ*pi*D_i*p_max/(4*P_b) or Length of Piston Skirt = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore*Maximum Gas Pressure inside Cylinder/(4*Bearing Pressure for Piston Skirt). Coefficient of Friction for Piston Skirt is the ratio of the side thrust on the liner to the maximum gas load on the piston, Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder, Maximum gas pressure inside cylinder is the maximum amount of pressure that can be generated inside the cylinder & Bearing Pressure for Piston Skirt is the compressive force acting on the contact area between two components having relative motion between them.

How to calculate Length of Piston Skirt given Allowable Bearing Pressure?

Length of piston skirt given allowable bearing pressure is the length of the piston skirt, the cylindrical portion of the piston between the last scrapper ring and the open-end is calculated using Length of Piston Skirt = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore*Maximum Gas Pressure inside Cylinder/(4*Bearing Pressure for Piston Skirt). To calculate Length of Piston Skirt given Allowable Bearing Pressure, you need Coefficient of Friction for Piston Skirt (μ), Diameter of Cylinder Bore (D_i), Maximum Gas Pressure inside Cylinder (p_max) & Bearing Pressure for Piston Skirt (P_b). With our tool, you need to enter the respective value for Coefficient of Friction for Piston Skirt, Diameter of Cylinder Bore, Maximum Gas Pressure inside Cylinder & Bearing Pressure for Piston Skirt and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Length of Piston Skirt?

In this formula, Length of Piston Skirt uses Coefficient of Friction for Piston Skirt, Diameter of Cylinder Bore, Maximum Gas Pressure inside Cylinder & Bearing Pressure for Piston Skirt. We can use 3 other way(s) to calculate the same, which is/are as follows -

Length of Piston Skirt = 0.8*Diameter of Cylinder Bore
Length of Piston Skirt = 0.65*Diameter of Cylinder Bore
Length of Piston Skirt = Side thrust on piston/(Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore)

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