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Hydraulic Knowledge

How to Size a Hydraulic Cylinder Bore From Force & Pressure

Август 19, 2026

Size from the machine’s required thrust at the worst linkage position, not from a familiar bore. The core relationship is force = pressure × effective area, but available pressure and effective area change with circuit direction.

1. Convert Machine Load to Cylinder Thrust

Payload and cylinder force differ when levers and angles are involved. Use the worst geometry and include friction/acceleration as appropriate.

2. Choose Working Pressure

Use expected pressure at the cylinder under flow. Keep relief pressure as a protection setting unless the circuit defines it as the working point.

3. Calculate Bore

Divide required thrust by working pressure to get piston area, convert area to diameter, choose a practical bore and repeat the force check.

4. Check Retraction and Speed

Retraction uses annulus area, producing different force and speed. Flow demand rises with effective area for a given velocity.

5. Screen Rod Buckling

Long compression strokes require a column-stability check based on rod stiffness, effective length and mounting.

Frequently Asked Questions

What number comes first?

Required cylinder thrust at worst geometry plus pressure available at the actuator.

Why not use relief pressure?

It is a protection setting and may not equal normal pressure at the cylinder.

Why do extend/retract differ?

The rod removes pressure area on retraction.

How does bore affect speed?

A larger area needs more flow for the same speed.

When check buckling?

For slender rods carrying compression over long effective length.

Обсудите ваши требования к гидравлической системе.

Укажите диаметр цилиндра, ход поршня, способ крепления, давление, каналы, нагрузку и режим работы. Для замены приложите фотографии и точные размеры.

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