| Usage: | Transmission Chain, Drag Chain, Conveyor Chain, Dedicated Special Chain |
|---|---|
| Material: | Iron |
| Surface Treatment: | Oil Blooming |
|
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Roller chains are one of the most popular ways to transmit mechanical power. They are used in conveyors, wire-drawing machines, printing presses, automobile engines, and many other types of machinery. They are characterized by their high efficiency and their elasticity.
Chains can be made from plain carbon or alloy steel, stainless steel, or even nylon and brass. Most chain drive systems employ a double reduction system, but single reduction drives can be used in some applications as well. The use of horseshoe clips has been dropping in popularity as more and more chain drive systems utilize endless loops without the need for a joining link.
The first step in selecting a chain type is to determine the drive requirements of your machine. A basic rule of thumb is to choose a chain that will be driven with an ANSI-specified load of 1% of the tensile strength or a minimum of 18 lbs, whichever is less. This limit is intended to prevent premature failure of the link plates and is particularly important in continuous drives where a large chain load can lead to the failure of the sprocket links.
The chain that has been properly preloaded greatly decreases the initial elongation that occurs during the startup of the drive. This can increase usable service life significantly.
Tooth form and pitch are both critical to the design and performance of a roller chain. Tooth form is the theoretical shape of the sprocket teeth that are used to support the chain rollers. Tooth form is the most difficult part of a roller chain design to perfect, so it is essential that the chain's tooth form be accurate and consistent throughout its entire life.
Pitch is the distance between the center of each roller on the chain and each of the link plates. The chain's pitch is measured in eighths of an inch.
If the chain is made from a thicker link plate than standard, this increases its strength and fatigue resistance. The resulting increased pitch also improves its ability to absorb shock and vibration, which can extend chain life.
X-ring and O-Ring chains have internal lubrication that greatly decreases wear and increases chain life. The lubricant is inserted through the rivet holes in the links to reduce friction between the rings and the chain.
Oil ports in bushings are another feature that helps decrease wear and increase the lifespan of the chain. These ports provide lubrication to the areas of the bushing that need it.
Quad-staked pins and solid bushings are two additional features that are typically found in premium roller chains to help decrease the amount of wear on the pins. Both features deter early pin wear by providing a uniform bearing area that distributes load, and bearing pressure, evenly across the length of the pin.
Other features that can improve chain life include the proper installation of sprockets and rollers and the application of lubrication and maintenance practices. Some of the most common causes for excessive roller chain wear are poor sprocket alignment and lack of lubrication.
|
Chain Size
|
Attachment No.
|
J
|
K
|
L
|
M
|
N
|
T
|
|
CA550
|
A18
|
1.063
|
1.531
|
.500
|
.875
|
.266
|
.105
|
|
A550
|
A19*
|
1.000
|
1.406
|
.500
|
.875
|
.266
|
.105
|
|
CA550
|
A19*
|
1.000
|
1.594
|
.500
|
.875
|
.266
|
.105
|
|
A550
|
A25*
|
1.000
|
1.406
|
.500
|
.875
|
.328
|
.105
|
|
CA550
|
A27
|
1.063
|
1.406
|
.500
|
.875
|
.328
|
.105
|
|
CA550
|
A29
|
1.000
|
1.406
|
.500
|
.875
|
.391
|
.105
|
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