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Table 2-1 Timing Belts
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Figure 2-4 Trapezoidal Tooth Timing Belt
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Figure 2-5 HTD Timing Belt Tooth Profile
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Plastic-and-Cable Chain
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The other type of synchronous drive is based on a steel cable core. It is actually the reverse of belt construction where the steel or synthetic cable is molded into the rubber or plastic belt. Plastic-and-cable chain starts with the steel cable and over-molds plastic or hard rubber teeth onto the cable. The result appears almost like a roller chain. This style is sometimes called Posi-drive, plastic-and-cable, or cable chain. It is made in three basic forms. The simplest is molding beads onto the cable as shown in Figure 2-6. Figure 2-7 shows a single cable form where the plastic teeth protrude out of both sides of the cable, or even 4 sides of the cable. The third form is
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Figure 2-6 Polyurethane-coated steel-cable "chains" both beaded and 4-pinned can cope with conditions unsuitable for most conventional belts and chains.
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Figure 2-7 Plastic pins eliminate the bead chain's tendency to cam out of pulley recesses, and permit greater precision in angular transmission.
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Figure 2-8 A gear chain can function as a ladder chain, as a wide V-belt, or, as here, a gear surrogate meshing with a standard pinion.
shown in Figure 2-8. This is sometimes called plastic ladder chain. It is a double cable form and is the kind that looks like a roller chain, except the rollers are replaced with non-rolling plastic cross pieces. These teeth engage a similar shape profile cut in the mating pulleys. Another form of the cable-based drive wraps a spiral of plastic coated steel cable around the base cable. The pulleys for this form have a matching spiral-toothed groove. This type can bend in any direction, allowing it to be used to change drive planes. Both of these synchronous drive types are cheap and functional for low power applications.
CHAIN
Chain comes in three basic types. Ladder chain, generally used for power levels below 1/4 horsepower Roller chain, for fractional to hundreds of horsepower Timing chain, also called silent chain, for power levels in the tens to hundreds of horsepower
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Figure 2-9
Ladder Chain
Ladder Chain
Ladder chain is so named because it looks like a very small ladder. Its construction is extremely simple and inexpensive. A short piece of wire is bent into a U shape and looped over the next U in the chain. See Figure 2-9. This construction is not very strong so this chain is used mainly where low cost is paramount and the power being transferred is less than 1/4 horsepower.
Roller Chain
Roller chain is an efficient power transfer method. It is called roller chain because it has steel rollers turning on pins held together by links. Roller chain is robust and can handle some misalignment between the driveR and driveN gears, and in many applications does not require precise pretensioning of the pulleys. It has two minor weaknesses. 1. It doesn t tolerate sand or abrasive environments very well. 2. It can be noisy. Roller chain can be used for single stage reductions of up to 6:1 with careful attention to pulley spacing, making it a simple way to get an efficient, high reduction system. It is also surprisingly strong. The most common size chain, #40 (the distance from one roller to the next is .4")
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can transfer up to 2 horsepower at 300 rpm without special lubrication. Even the smallest size, #25, can transmit more than 5 horsepower at 3000 rpm with adequate forced lubrication and sufficiently large pulleys. There are several good references online that give much more detail than is within the scope of this book they are americanchainassn.org bostongear.com diamondchain.com ramseychain.com ustsubaki.com
As shown in Figure 2-10 (a d), roller chain comes in many sizes and styles, some of which are useful for things other than simply transferring power from one pulley to another.
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