Also known as linear hydraulic motor, hydraulic cylinders are apparently mechanical actuators which are used for giving unidirectional force via unidirectional stroke. The basic design of a hydraulic cylinder consists of a piston that is connected to a piston rod and a cylinder barrel. The working of the cylinder is depends upon the power of it which comes from hydraulic fluid, specifically it is oil. The secondary parts include cylinder head, cylinder base, seal and seal gland. Hydraulic cylinders are basically available in two types. One is the single acting cylinder and the other is the double acting cylinder. The double acting cylinder is made up of two ports at every end and hydraulic fluid is supplied for extension and retraction. While, in a single acting cylinder the fluid is supplied only through one end of it and as a result the rod is extended due to area difference. The rod again returns to its original position due to the external force of gravity. The various types of hydraulic cylinder designs include the two basic types that are welded body cylinders and tie rod cylinders. The special type of hydraulic cylinder include plunger, differential and telescopic cylinder. Hydraulic cylinders find their application in many areas like manufacturing machinery, civil engineering as well as in construction equipments or vehicles. Most of the power steering systems work with the help of hydraulic cylinder systems.
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