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effective volume of the cylinder decreases due to the extra space now being occupied by the solid piston rod. This would be the case even if there were no piston attached to the rod, as the only changing factor is the cylindrical volume of the rod itself. Second, the bottom of the piston always experiences a greater force opposite to the compressing action than the top. Again, this would be the case even if there was no piston attached. Even though the compressed gas exerts an equal amount of force on all the inner surfaces of the cylinder and piston rod, the force contribution in the direction of travel is practically zero for the sides of the rod, but nearly total for the bottom of the rod. The addition of a piston to the end of the rod thus does not alter the net forces involved, but instead partially separates the cylinder into two volumes with restricted flow of gas and oil between them, through flow-restriction channels in either the piston or the cylinder wall.
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There are also techniques to make variable-lift gas springs. These are intended for short production runs and prototypes, and in applications where the exact force is important but hard to estimate in advance, such as lifting a lid slowly in a known time. In this case, the cylinder is supplied filled
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A gas spring consists of a sealed cylinder filled with a charge of high-pressure gas, a piston rod attached to a piston with a sliding seal, and some oil. The piston (or the cylinder wall) contains a number of channels that allow the gas to transfer between the lower chamber (between the piston and
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It is possible to reduce the gas volume and increase its internal pressure by means of a movable end stop, or by allowing one tube to slide over another, allowing the characteristics of a gas spring to be adjusted during operation. The rod may be hollow by use of clever seals, or it may consist of
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If the internal plunger features a diaphragm that extends to the side of the gas tube, it will stop moving once the applied force becomes constant and will support a weight, like a normal spring. Some gas springs have fine holes in the plunger for additional damping: these are called "slow-damper
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In the ideal case of a piston moving with zero friction through a fully sealed cylinder, there are two key phenomena which can be thought of as acting simultaneously inside the spring as it is compressed. Firstly, as the spring is compressed and the piston rod is pushed into the cylinder, the
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to maximum design pressure but equipped with a bleed port to allow gas to be released once installed. The intention is that the design can be over-sprung, and then the pressure is reduced in stages to optimize behavior. If too much gas is released, a new spring must be installed.
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Extended stroke is usually acquired through telescoping mechanisms, composed of one rod and multiple cylinders, where the smaller of the two cylinders actually acts as a second rod extending in and out of the larger cylinder.
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the closed end of the cylinder) and the upper chamber (between the piston and the head cap). This causes the pressure in both chambers to equilibriate no matter how far the piston is pushed down the tube.
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Gas springs are used in automobiles to support hatches, hoods, and covers. They are also used in furniture and doors, as well as in medical beds. They are used industrially in
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system. Gas springs with high caliber 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
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springs" and are common on safety gates and doors. A gas spring designed for fast operation(s) is termed a "quick gas spring" and is used in the manufacture of
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Gas springs whose pistons have fine holes in them for damping are called slow-damper springs and are common on safety gates and doors.
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It is also possible to make degressive gas springs, where the spring becomes more, not less, powerful as the main cylinder expands.
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Savaresi, Sergio M.; Poussot-Vassal, Charles; Spelta, Cristiano; Sename, Olivier; Dugard, Luc (2010-08-13).
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applied parallel to the direction of the piston shaft (loosely analogous similarly to a
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around the rod and forcing it to allow gas in by external overpressure or a shuttling
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A gas spring can be given adjustable push-in force via a local knob or remote via a
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multiple small-diameter rods. A small amount of oil is normally present.
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is a common gas in gas springs because it is inert and nonflammable.
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Simplified constant-force pneumatic gas spring with sectional view:
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gas spring directly compresses a chamber of air with the piston. A
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gas spring instead compresses a chamber of oil linked to an
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Gas springs are usually implemented in one of two ways. A
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that, unlike a typical mechanical spring that relies on
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in which the pressure of the oil compresses the gas.
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343:"Understanding the Basics of Gas Spring Application"
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414:Semi-Active Suspension Control Design for Vehicles
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409:"Semi-Active Suspension Technologies and Models"
468:"Technology and characteristics of gas springs"
384:"What are gas springs? A technical primer"
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492:"Degressive gas spring"
193:without a gas outlet).
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388:Motion Control Tips
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347:Tech Briefs
293:Bowden wire
217:accumulator
136:5. Cylinder
130:2. Head cap
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353:2024-03-31
322:References
287:Variations
267:, using a
155:gas damper
147:gas spring
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138:6. Piston
506:Category
310:See also
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250:air guns
221:Nitrogen
171:cylinder
472:Vapsint
281:airbags
165:, uses
134:4. Seal
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