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A hydraulic cylinder (also called a linear hydraulic motor) is a mechanical actuator that is used to give a unidirectional force through a unidirectional stroke. [ citation needed ] It has many applications, notably in construction equipment ( engineering vehicles ), manufacturing machinery , elevators , and civil engineering.
A position-sensing hydraulic cylinder is a hydraulic cylinder with an integrated position feedback sensor to determine its current position. Position-sensing hydraulic cylinders may be found in heavy industry , subsea , and mobile heavy equipment applications.
One of the first of these was Arthur Rigg's patent engine of 1886. This used a double eccentric mechanism, as used on variable stroke power presses, to control the stroke length of a three cylinder radial engine. [2] Later, the swashplate engine with an adjustable swashplate angle would become a popular way to make variable stroke hydraulic motors.
Sequence valves control the sequence of hydraulic circuits; to ensure that one hydraulic cylinder is fully extended before another starts its stroke, for example. Hydraulic circuits can perform a sequence of operations automatically, such as trip-and-reclose three times, then lockout, of an oil-interrupting recloser .
The control signal is relatively low in energy and may be voltage, electric current, pneumatic, or hydraulic fluid pressure, or even human power [clarification needed]. [3] In the electric, hydraulic, and pneumatic sense, it is a form of automation or automatic control .
Telescopic cylinders must only be used in machinery as a device for providing force and travel. Side forces and moment loads must be minimized. Telescopic cylinders should not be used to stabilize a structural component. [4] Hydraulic telescopic cylinders are often limited to a maximum hydraulic pressure of 2000-3000 psi.
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