Top Benefits of Telescopic Hydraulic Cylinders in Heavy Machinery

 

Telescopic hydraulic cylinders are widely used in various fields, especially in mobile applications. The ability of this cylinder design to offer an unusually long stroke while retaining a relatively modest retracted length is its greatest advantage. When mounting space is limited and a long stroke is required, a telescopic cylinder is the solution. Depending on the number of phases, a telescopic cylinder, also recognised as a multi-stage cylinder, might have a shrunken length as short as 20% of the fully prolonged cylinder length.

Since most telescopic hydraulic cylinders are mounted on a sleeve, which represents almost 20% of the actual working length, they offer a longer working stroke. If a conventional single rod hydraulic cylinder cannot be used, a telescopic hydraulic cylinder will be preferred due to its compact size. Telescopic hydraulic cylinders operate on a similar principle as single-acting and double-acting hydraulic cylinders. The main difference between the two types is that in telescopic cylinders the piston or barrel is integrated into a compact housing with other tubes, which extend along with the extension of the main piston or barrel. 

Telescopic Hydraulic Cylinder Design

The smaller part is called the rod or plunger, while the larger diameter tube is called the barrel, just like in a traditional single rod cylinder. A telescopic cylinder has one or more stages, which are nested tubes with decreasing diameter from the outer barrel. It seems that six stages is the maximum number. It is theoretically possible to create a cylinder with more stages, but stability becomes an issue. Cylinders with three or four stages are quite common.

Typically, the stages of a telescopic cylinder go from largest to smallest in size. Before the next stage moves, the largest stage will complete its travel. This continues until the cylinder reaches its fully extended length and all stages are fully stretched.

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