Technical Information

What is a gas spring | What are they used for | Why use a gas spring | Custom made springs | Technical info | Are gas springs safe ? | Gas springs and the environment

WHAT IS A GAS SPRING?

A gas spring; also called a strut or stay, is a mechanical device which harnesses the kinetic or elastic energy of a gaseous element to provide a potential energy source.

In layman’s terms, the simplest form of gas spring is a cylinder, filled with an inert gas (nitrogen) to a pre-determined pressure. When a rod is forced into the cylinder it displaces some of the gas which exerts pressure to push the rod out again, thus providing a positive force to the rod.

CUTAWAY OF 22 SERIES GAS SPRING

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WHAT ARE GAS SPRINGS USED FOR?

Gas springs are used in a myriad of industrial applications where a single directional force is required. The most common use is in the family car to hold open the bonnet or boot and to provide control over the opening movement of these heavy and potentially dangerous apparatus.

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WHY USE A GAS SPRING?

Whilst any spring (gas or metal) provides a one directional force when compressed, a gas spring has the following advantages in the outcome it delivers:

 

We can produce a spring of any force, stroke and or length* in small or large quantities with our patented system of gassing and sealing our springs.

Furthermore, the force rating can be changed as and when required.

Traditionally, users of gas springs in Australia have been required to purchase a gas spring that is ex stock regardless of its suitability for the task at hand. To have a special spring made for a low volume application was impractical because of the tooling costs involved; thus users were forced to use the nearest available option.

At Aussie Gas Strut Pty. Ltd. the length, stroke and force of gas springs are *excessively variable in any quantity.

*certain aspects of a gas spring are limited by formulae

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CUSTOM MADE SPRINGS

As Prototypes are an essential part of development of a new design or invention, we understand the importance of prototypes and are geared to assist with the design, development and manufacture of a prototype, at A REASONABLE COST! and, within a prompt time frame.

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TECHNICAL INFORMATION

SIZES AND OPTIONS OF SPRINGS:

 SIZE CODE  00  11  22  23  34  45  S/Steel
 ROD/BODY DIAMETER   6/15  8/19  10/23  12/23  16/32  20/42  10/25
 STROKE  40-150  40-400  40-800  40-1000  40-1000  40-1500  40-800
 EXTENDED LENGTH  2Xstr+22   2Xstr+30   2Xstr+35   2Xstr+50   2Xstr+70   2Xstr+70   2Xstr+35 
 FORCE n  50-400  50-800  50-1200  50-1800  50-3000  50-5200  50-1200
 FORCE INCREASE  30%  30%  30%  45%  40%  40%  25%
 VALVE  NO  NO  NO  NO  YES  YES  NO
 HI-TEMP SEALS  OPTION  OPTION  OPTION  OPTION  OPTION  OPTION  OPTION

PART NUMBER BREAKDOWN:

Typical ex-stock spring part # 257-210-0450-11-B0 B0
257 - 210 - 0450 - 11 - B0 - B0
XXX - XXX - XXXX - XX - XX - XX
 BODY 
 LENGTH 
   STROKE 
 LENGTH 
   FORCE 
 RATING 
   SIZE 
 CODE 
   BODY END 
 FITTING 
   SHAFT END 
 FITTING 

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ARE GAS SPRINGS SAFE?

Yes gas springs are safe when used in accordance with instructions! Puncturing high pressure vessels of any kind is a hazardous practice and must not be done with any type or make of spring. Similarly, where gas springs are intended to be used outside normal atmospheric conditions, those conditions must be specified prior to ordering, so that any necessary changes or instructions can be arranged. Naturally, strict guidelines are used in the manufacture of our gas springs and pressure limits must be adhered to for certain sizes of spring component parts eg. #11 series (8mm shaft) springs are not pressurised to greater than 750N force.

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GAS SPRINGS AND THE ENVIRONMENT

Gas springs are filled with (N2) nitrogen (industrial dry nitrogen) which comprises up 78% of the earth’s atmosphere and is a colourless, odourless and an inert gas. This means that the environment will not be effected if the gas escapes, is harmless to humans and will not explode or burn.

Each spring contains a small quantity of oil (similar to automatic transmission fluid) 3-5ml which maintains the integrity of the seals within the unit, aids fluid movement of the unit and provides damping of the final part of the stroke.

Care must be taken in the disposal of unwanted or used gas springs which are either fully or partially gassed as they can cause damage if inadvertently punctured, incinerated or crushed eg. if mixed in with normal rubbish. We offer a service to properly dispose of and recycle used or unwanted gas springs.

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Do you need help ?  Please feel free to contact us by email or phone and we will guide you step by step. No matter what technicality or difficulty, we have engineers on hand to help you with and through the process.



Copyright, Aussie Gas Strut Company