21-06-2012, 05:57 PM
Fluid PowerHydraulic Cylinders
Fluid Power.ppt (Size: 5.26 MB / Downloads: 50)
Function of Hydraulic Cylinders
The main function of a cylinder is to convert hydraulic power into linear mechanical force.
This force performs work or transmits power.
Ram Cylinders
The simplest single acting cylinder
One fluid chamber
Exerts force in only one direction
Mounted mostly vertically
The cylinder retracts by the force of the load due to gravity
Ram Cylinders
Ram cylinders are most commonly used in elevators, jacks, and automobile hoists.
Can also be used on a scissors lift.
Single Acting Cylinders
Acts much like a ram cylinder
Main difference is that the single acting cylinder uses a piston. The leakage flow that goes past the piston is ported the tank.
Telescopic Cylinders
Mostly a single acting cylinder
Series of rod segments called sleeves, most common to only have 4 or 5 sleeves in each cylinder
The sleeves work together to provide a longer stroke
The maximum force is at the collapsed position
The speed will increase at each stage, but will not allow as much force.