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Indirect Power Transfer Devices
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might even be possible to make the meshing worms and gears, or at least parts of them, out of such lightweight materials as titanium, aluminum, and composites. This work was done by Lev. I. Chalko of the U.S. Army Propulsion Directorate (AVSCOM) for Lewis Research Center.
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CONTROLLED DIFFERENTIAL DRIVES
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By coupling a differential gear assembly to a variable speed drive, a drive s horsepower capacity can be increased at the expense of its speed range. Alternatively, the speed range can be increased at the expense of the horsepower range. Many combinations of these variables are possible. The features of the differential depend on the manufacturer. Some systems have bevel gears, others have planetary gears. Both single and double differentials are employed. Variable-speed drives with differential gears are available with ratings up to 30 hp. Horsepower-increasing differential. The differential is coupled so that the output of the motor is fed into one side and the output of the speed variator is fed into the other side. An additional gear pair is employed as shown in Figure 2-18. Output speed
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n2 n4 = 1 n1 + 2 R
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T4 = 2T3 = 2RT2
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Rn1 + n2 hp = T2 63, 025
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hp increase
Rn1 hp = T2 63, 025
Speed variation
n4 max n4 min = 1 2R (n2 max n2 min)
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Indirect Power Transfer Devices
Figure 2-18
Figure 2-19
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Indirect Power Transfer Devices
Figure 2-20 A variable-speed transmission consists of two sets of worm gears feeding a differential mechanism. The output shaft speed depends on the difference in rpm between the two input worms. When the worm speeds are equal, output is zero. Each worm shaft carries a cone-shaped pulley. These pulley are mounted so that their tapers are in opposite directions. Shifting the position of the drive belt on these pulleys has a compound effect on their output speed.
Speed range increase differential (Figure 2-19). This arrangement achieves a wide range of speed with the low limit at zero or in the reverse direction.
TWIN-MOTOR PLANETARY GEARS PROVIDE SAFETY PLUS DUAL-SPEED
Many operators and owners of hoists and cranes fear the possible catastrophic damage that can occur if the driving motor of a unit should fail for any reason. One solution to this problem is to feed the power of two motors of equal rating into a planetary gear drive. Power supply. Each of the motors is selected to supply half the required output power to the hoisting gear (see Figure 2-21). One motor drives the ring gear, which has both external and internal teeth. The second motor drives the sun gear directly. Both the ring gear and sun gear rotate in the same direction. If both gears rotate at the same speed, the planetary cage, which is coupled to
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Indirect Power Transfer Devices
Figure 2-21 Power flow from two motors combine in a planetary that drives the cable drum.
the output, will also revolve at the same speed (and in the same direction). It is as if the entire inner works of the planetary were fused together. There would be no relative motion. Then, if one motor fails, the cage will revolve at half its original speed, and the other motor can still lift with undiminished capacity. The same principle holds true when the ring gear rotates more slowly than the sun gear. No need to shift gears. Another advantage is that two working speeds are available as a result of a simple switching arrangement. This makes is unnecessary to shift gears to obtain either speed. The diagram shows an installation for a steel mill crane.
HARMONIC-DRIVE SPEED REDUCERS
The harmonic-drive speed reducer was invented in the 1950s at the Harmonic Drive Division of the United Shoe Machinery Corporation, Beverly, Massachusetts. These drives have been specified in many highperformance motion-control applications. Although the Harmonic Drive Division no longer exists, the manufacturing rights to the drive have been sold to several Japanese manufacturers, so they are still made and sold. Most recently, the drives have been installed in industrial robots, semiconductor manufacturing equipment, and motion controllers in military and aerospace equipment. The history of speed-reducing drives dates back more than 2000 years. The first record of reducing gears appeared in the writings of the Roman engineer Vitruvius in the first century B.C. He described wooden-
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