Tags: hydraulic cylinder

Hydraulic Regeneration Circuit

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Hydraulic Regeneration Circuit

A typical hydraulic cylinder have a larger extending force than retracting because of the area difference between full bore and annulus sides of the piston. Hydraulic regeneration system can be use to equalize the force. The example hydraulic regeneration circuit in figure above employs a differential cylinder with a full bore/annulus ratio of 2:1. During …

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Hydraulic Cylinder Construction

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Hydraulic Cylinder Construction

Typical construction for cylinders used in industrial applications is shown in Fig. 7.18. The seals are a key feature, as is the rod wiper. Dirt from the environment settles on the rod and will ingress into the hydraulic system if it is not removed. Some small particles do escape the wiper, and these must be …

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Hydraulic Cylinder Failure

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Hydraulic Cylinder Failure

Standard cylinders are not designed to take a side load. Care must be taken to ensure that binding does not occur during extension or retraction. A designer will use one of the mounting methods shown in Fig. 7.15 to prevent binding. Also, it is often necessary to provide guides to ensure that the load follows …

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Hydraulic Cylinder Selection

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Cylinder manufacturers typically classify their products as heavy duty, medium duty, and light duty. Pressure ratings up to 6000 psi are available. Some manufacturers build an agricultural-grade cylinder. These cylinders are satisfactory for applications where annual use is limited. A manufacturing application, where the cylinder cycles thousands of times per year, requires an industrial-grade cylinder.

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Hydraulic Cylinder Cushioning

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Hydraulic Cylinder Cushioning

When cylinders reach the end of their stroke, the pressure rises quickly, creating a shock wave in the hydraulic circuit. Cushioning is done to reduce this stock. The concept, shown in Fig. 7.6, is quite simple. First, we consider the case in which the cylinder is retracting. The spear closes off the large opening where …

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Basic Concept of Hydraulic Cylinder

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Basic Concept of Hydraulic Cylinder

Suppose a flow of fluid is delivered to a hydraulic cylinder, causing it to extend. The cylinder has a cross-sectional area A and delivers a force F while moving a distance x (Fig. 1.2). The distance moved is related to the fluid volume delivered to the cylinder. x = V/A                    (1.5) where x = distance …

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