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Gas spring

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Title: Gas spring  
Author: World Heritage Encyclopedia
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Subject: Proposed mergers/Log/March 2015, Gas lift chair, Springs (mechanical), Scanning tunneling microscope, Air gun
Collection: Springs (Mechanical)
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Gas spring

CGI of one type of gas spring
Gas spring with sectional view:

1. Piston rod
2. Head cap
3. Piston rod wiper
4. Piston rod guide bushing
5. Retaining ring
6. O-ring
7. Piston rod seal
8. Cylinder
9. Piston
10. Flow-restriction orifice
11. Piston guide bushing
12. Valve

13. Valve-sealing screw

A gas spring is a type of spring that, unlike a typical metal spring, uses a compressed gas, contained in a cylinder and compressed by a piston, to exert a force. Common applications include automobiles (where they are incorporated into the design of struts that support the weight of hatchback doors while they are open) and office chairs. They are also used in furniture, medical and aerospace applications. Much larger gas springs are found in machines that are used in industrial manufacturing (the press tooling industry), where the forces they are required to exert often range from 2500N to 400,000N (Forty tonnes). To properly use gas springs in even the simplest application, users should understand how they work and how a gas spring can be modified to meet specific operating requirements.

Types

Gas springs are manufactured in many varieties including:

  • Standard cylinder
  • Fixed-height cylinder
  • Spindle only
  • Cable cylinder
  • Stage cylinder
  • Non-rotating cylinder
  • Return rylinder (no height adjustment)
  • Auto-return cylinder with height adjustment
  • Bouncing cylinder
  • Dual-mode cylinder
  • Heavy duty cylinder

Common applications

If the internal plunger has a diaphragm which extends to the side of the gas tube, it will cease to move once an applied force is constant and will support a weight, like a normal spring. If a fine hole exists in the plunger, however, it is termed a "slow-dampened spring" and can be used on heavy doors and windows. A gas spring designed for fast operation is termed a "quick gas spring" and is used in the manufacture of air guns and recoil buffers. Reducing the gas volume and hence increasing its internal pressure by means of a movable end stop, or allowing one tube to slide over another, can allow the characteristics of a gas spring to be adjusted during operation. The rod may be hollow by use of clever seals or may consist of multiple small-diameter rods. A small amount of oil is normally present. The gas may be introduced by a Schrader-type valve, using a lip seal around the rod and forcing it to allow gas in by external overpressure or a shuttling O-ring system. Gas springs of high pressure contain a very large amount of energy and can be used as a power pack. In emergency use the gas may be introduced via a gas generator cell, similar to those used in airbags. Gas springs are used to operate the main valve on Formula 1 racing cars. Passive heave compensators features large gas springs. The stroke lengths can exceed 6 meter.

Features

A variety of features are available from various manufacturers:

  • Adjustable push-in force via a local knob or remote via a bowden wire.
  • Single touch release to allow full extension or the ability to lock it out.
  • Extended stroke through telescoping mechanisms, usually composed of one rod and two cylinders (the smaller of the two cylinders actually acts as a second rod extending in and out of the larger cylinder).
  • Vari-lift - intended for short production runs and prototypes, in applications
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