Xiamen Shuangyuan Springs Co., Ltd 'Blog

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Lockable Gas Springs Flexible

A small quantity of oil is inserted into the lockable gas spring so that in its normal rod down position, the seal is lubricated for maximum life. Other orientations are possible by the addition of an oil chamber.

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Micro Gas Springs

Micro compression gas springs offer users many advantages due their small size and low force. Micro springs are also available in 316 stainless steel and in custom strokes and lengths. The table below shows our standard sizes.

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Gas spring working principle

A gas filled spring consists of a precision rod attached to a piston moving within a sealed cylinder containing nitrogen at high pressure.  As the piston rod is introduced into the cylinder (compression stroke), the internal pressure increases according to the volume of gas displaced buy the rod.  Output forces are the result of the differential between the pressure in the cylinder and atmospheric pressure outside the cylinder acting on the cross-section of the rod.  This increase in Force or K-Factor is normally between 5% - 50%.  In comparison to mechanical springs, gas springs are almost constant force.

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How to adjust the force on a gas spring with an IGS Side Release Valve

The IGS Side Release Valve can be found on the Euroline range of gas springs. It can also be found on custom made gas springs where a SRV was specified.

You should keep in mind that this type of release can also be activated by other persons, therefore it is suitable for prototypes or when the gas spring is fitted in an area which cannot be easily accessed by the end user.

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How to adjust the gas spring pressure

How to increase the force

On first orders and prototypes, we always recommend that you purchase a gas spring which has more force than necessary then adjust it down to suit your application.

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Protect the gas spring can do and can not do

Can do:

Try to use ball joints to help avoid side load forces. If eyes or fork clevises are used, ensure a loose fit to allow for lateral movement.
Use standard gas springs rod down, i.e. the spring should be mounted so that it spends most time in a rod down position, within 60° of vertical, thus ensuring the seal stays lubricated. For tension springs the exact opposite is true, i.e. use rod up. Once installed, test at least every three months.
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Friction and Hysteresis

Hysteresis is defined as a lag or differential in the expected output force of a spring caused by friction. This is most evident when the output force measured during extension and compression.  This measures the efficiency of a spring e.g., the lower the friction the higher the efficiency. Four points defined as P1, P2, P3 and P4 are recorded but with dynamic testing the resulting graph can be viewed in real time.IGS provides P1 to P4 graphs for specific springs as a means to predict the suitability of a particular spring design in an application.

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Release Valves

All IGS springs, with the exception of the micro gas springs, are available with release valves (RV). RV gas springs are fitted with an internal aerospace quality valve located under the removable stud on the cylinder end of the spring. The adjusted gas springs are then returned to IGS for force testing. These springs are generally supplied at a higher force than deemed necessary for the application and are adjusted by the user until the correct operating characteristics are achieved. Should too much force be let out, the springs can be recharged.

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Gas Spring Mounting

All gas springs contain a small amount of oil to lubricate the main seal and rod and provide end of stroke damping (see damping). If standard gas springs are operated and mounted in a rod up orientation, fluid cannot reach the main seal or rod which leads to excessive seal wear and reduced life. It is recommended that standard gas springs be mounted rod down at least 30 degrees off horizontal. If the application cannot accommodate rod down mounting, an oil or grease chamber should be specified. Both are optional features.

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Damping

Damping is achieved regulating the flow of gas and/or fluid through the valved orificing of the gas damper piston.  This is shown in the animation to the right. Commonly used compression gas springs when mounted in a rod down orientation achieve maximum damping when the piston reaches the oil near the point of full extension.   Referred to as the oil damping zone, it provides a cushioning affect to slow the mechanism as it reaches the fully deployed position.

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Author

shuangyuan

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Xiamen Shuangyuan Springs Co., Ltd copy right @2006-2008     Address: No.177, Xisanli, Jinshan, Huli, Xiamen, China
Tel: +86(592)5254186   +86(592)5289710       Fax: +86(592)5513310
Email: shuangyuan@springinchina.com    rosecn888@gmail.com
China manufacturer of gas spring,disc spring,die spring,lockable gas spring and compression spring