Hydraulic Cylinders Design

When hydraulic system must produce linear motion, cylinders (sometime called actuators or linear hydraulic motors) are the components what convert the fluid pressure and flow to straight-line, controllable mechanical force and motion to move load. The flow of the fluid into a cylinder causes the piston to move, and the fluid pressure gives the piston its mechanical force.

The high versatility of hydraulic cylinders allows designers to use actuators in various applications even in the most hoist environment, utilizing the size, configuration, design flexibility in combination with reliability and robustness.

CLASSIFICATION OF HYDRAULIC CYLINDERS BY CONFIGURATION

Double acting cylinders

These types of cylinders provide power in both directions, with a pressure port at either end.
Typical arrangements are

Single rod end

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Double rod end
(nondifferential cylinders)

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Positional or duplex cylinder

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Tandem cylinder

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Single acting cylinder

The single-acting cylinder is pressurized at one end only.
Typical arrangements are

Load return

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Spring return

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Ram (hydraulic press)

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Telescopic

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

CLASSIFICATION OF HYDRAULIC CYLINDERS BY CONSTRUCTION

Tie-rod cylinders

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Tie-rod cylinders use high-strength threaded steel tie rods on the outside of the cylinder housing for additional strength and stability.

Mill type cylinders

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Mill type cylinders have flanges welded to both ends of their barrel with an end cap bolted to each flange (large mill-duty cylinders often have a barrel wall thick enough for the end-cap bolts to be threaded directly into the barrel wall)

Welded cylinders

High Performance Sealing Solutions SealFluid Hydraulic Cylinders Design - for Fluid Power Hydraulic and pneumatic applications

Welded cylinders have a heavy-duty housing with a barrel welded directly to the end caps and require no tie rods.

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