vb.net barcode reader usb Figure 2-10a Standard roller chain for power transmission and conveying. in Software

Create ECC200 in Software Figure 2-10a Standard roller chain for power transmission and conveying.

Figure 2-10a Standard roller chain for power transmission and conveying.
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Figure 2-10b Extended pitch chain for conveying
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Indirect Power Transfer Devices
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Figure 2-11 Bent lug roller chain used for rack and pinion linear actuator.
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A clever, commercially available modification of roller chain has extended and bent lugs. These lugs can be bolted directly to pads and used for tracks on tracked vehicles, simplifying this sometimes complicated part of a high-mobility robot. Care must be taken to keep the pads as thin as possible, or to space them out to every other bent lug because debris can jam between the pads and cause problems. This is why tracks on excavators and military tanks are specially designed with the pivot point as close to the ground as possible. Other than that small issue, however, this chain can be and has been used as the backbone for tracks.
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Rack and Pinion Chain Drive
Bent lug roller chain can also be used as a low cost rack and pinion drive to get linear motion from rotary motion. Though crude, this system works well if noise and a slightly non-smooth linear motion can be tolerated. Figure 2-11 shows a basic layout for this concept.
Timing or Silent Chain
Silent chain gets its name from the fact that it is very quiet, even at high speeds and loads. It is also more efficient than roller chain because the clever shape of its inverted teeth provide smooth transfer of power from
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Indirect Power Transfer Devices
Figure 2-12 Silent chain tooth profile
the chain to the pulley. It is intolerant of grit, is somewhat more expensive, and requires more precision in alignment between the driveR and driveN pulleys than a roller chain. It is a very good choice for transmitting high horsepower at thousands of rpm from an electric motor or an internal combustion engine to the transmission of large vehicles. It was used in the Oldsmobile Toranado automobile in the late 1970s, where it transmitted several hundred horsepower from the engine to the transmission. It is not made in small sizes because of the special shape of its teeth (Figure 2-12) and is designed mainly for power ranges from tens to hundreds of horsepower. With proper design and simple maintenance, a silent chain drive will last for thousands of hours. If high efficiency and high power are required with operation in a clean environment, and the higher price can be afforded, silent chain is the best choice of any power transfer device in this book.
FRICTION DRIVES
Power can be transferred by friction alone. This technique is usually reserved for special cases, where its short life is acceptable. Its claim to fame is its high efficiency and ability to vary speed. The usual layout for a variable speed friction drive is a hardened steel wheel mounted on the input shaft, which is pushed very hard against a steel disk mounted on the output shaft. Efficiencies can be high, but the high forces required to carry the torque through only friction wear out the mating
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Indirect Power Transfer Devices
surfaces at a high rate. This drive has been used with some success in walk-behind lawn mowers, but its life in that application is usually only a couple seasons. Figure 2-13 shows one of several versions of a friction drive.
CONE DRIVE NEEDS NO GEARS OR PULLEYS
A variable-speed-transmission cone drive operates without gears or pulleys. The drive unit has its own limited slip differential and clutch. As the drawing shows, two cones made of brake lining material are mounted on a shaft directly connected to the engine. These drive two larger steel conical disks mounted on the output shaft. The outer disks are mounted on pivoting frames that can be moved by a simple control rod. To center the frames and to provide some resistance when the outer disks are moved, two torsion bars attached to the main frame connect and support the disk-support frames. By altering the position of the frames relative to the driving cones, the direction of rotation and speed can be varied. The unit was invented by Marion H. Davis of Indiana.
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