Researching and developing ability for hydraulic cylinder design and manufacturing by HC

HC has the very strong hydraulic cylinder researching and developing ability for hydraulic cylinder design and manufacturing, during the past more than 10 years experience and researching on the hydraulic cylinder, HC has established company standard of design, machining process standard pressure formula. Due to the experience in design, machining and quality controlling, HC hydraulic cylinder has met all kinds of hydraulic cylinder and also have met all kinds of blind area of quality. The followings are describing to HC experience and technologies knowledge for hydraulic cylinders' design, manufacturing and developing.

Due to the hydraulic cylinders moving is directly, it is only for pushing or pulling, there should be one bending or curves surface in the barrel or in the piston rod. For this reason, the standard hydraulic cylinder should be used for pushing and pulling only. No bending moments or side loads should be transmitted to the piston rod or the cylinder. For this reason, the ideal connection of the hydraulic cylinder should be a single ring with a special ball bearing. In this way, the hydraulic cylinder can move without any miss-alignment between the actuator and the loaded components during the pulling or pushing.

Hydraulic Cylinder Designs

There are mainly two styles of hydraulic cylinder designs used:

•  Tie rod type hydraulic cylinders
•  Welded body type hydraulic cylinders

Tie rod type hydraulic cylinders:

Tie rod style hydraulic cylinders use high strength threaded steel rods to hold the two end caps to the cylinder barrel. This method of construction is most often seen in industrial factory applications. Small bore cylinders usually have 4 tie rods, while large bore cylinders may require as many as 16 or 20 tie rods in order to retain the end caps under the tremendous forces produced. Tie rod style cylinders can be completely disassembled for service and repair.

The National Fluid Power Association (NFPA) has standardized the dimensions of hydraulic tie rod cylinders. This enables cylinders from different manufacturers to interchange within the same mountings.

Welded body type hydraulic cylinders:

Welded body cylinders have no tie rods. The barrel is welded directly to the end caps. The ports are welded to the barrel. The front rod gland is usually threaded into or bolted to the cylinder barrel. This allows the piston rod assembly and the rod seals to be removed for service.

Welded body cylinders have a number of advantages over tie rod style cylinders. Welded cylinders have a narrower body and often a shorter overall length enabling them to fit better into the tight confines of machinery. Welded cylinders do not suffer from failure due to tie rod stretch at high pressures and long strokes. The welded design also lends itself to customization. Special features are easily added to the cylinder body. These may include special ports, custom mounts, valve manifolds, and so on.

The smooth outer body of welded cylinders also enables the design of multi-stage telescopic cylinders.

Welded body hydraulic cylinders dominate the mobile hydraulic equipment market such as construction equipment (excavators, bulldozers, and road graders) and material handling equipment (forklift trucks and lift-gates). They are also used in heavy industry such as cranes, oil rigs, and large off-road vehicles in above-ground mining.