Types of Hydraulic Cylinders
The types of cylinders are:
Double-acting (Fig. 7.14a)
Single-acting, spring return (Fig. 7.14b)
Double-rod (Fig. 7.14c)
Tandem (Fig. 7.14d)
Telescoping (Fig. 7.14e)
The double-rod cylinder has the same annular area on both sides, so it develops the same maximum force in both directions for a given relief valve pressure. It also extends and retracts at the same velocity when a given flow is supplied.
The tandem cylinder provides a means for increasing the force that can be generated with a given pressure. For extension, the total force is
F=(Ac + Ar)P
Telescoping cylinders are used when a long stroke is needed and the space available to mount the cylinder is limited. A typical example is the telescoping cylinder on a dump truck.
Categories: Actuators | Tags: Hydraulic Cylinders, Telescoping cylinders | Leave a comment