barcode generator vb.net code FIGURE 11.10 Gear pitch diameter based on surface durability. in Software

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FIGURE 11.10 Gear pitch diameter based on surface durability.
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FIGURE 11.11 Gear pitch diameter based on bending strength.
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5. For high-capacity ground spiral-bevel and hypoid gears, the gear diameter from the durability chart should be multiplied by 0.80. 6. For hypoid gears, multiply the gear pitch diameter by D/(D + E). 7. Statically loaded gears should be designed for bending strength rather than surface durability. For statically loaded gears subject to vibration, multiply the gear diameter from the strength chart by 0.70. For statically loaded gears not subject to vibration, multiply the gear diameter from the strength chart by 0.60. 8. Estimated pinion diameter is d = Dn/N. 11.4.4 Number of Teeth Figure 11.12 gives the recommended tooth numbers for spiral-bevel and hypoid gears. Figure 11.13 gives the recommended tooth numbers for straight-bevel and Zerol bevel gears. However, within limits, the selection of tooth numbers can be made in an arbitrary manner. More uniform gears can be obtained in the lapping process if a common factor between gear and pinion teeth is avoided. Automotive gears are generally designed with fewer pinion teeth. Table 11.2 indicates recommended tooth numbers for automotive spiral-bevel and hypoid drives. 11.4.5 Face Width The face width should not exceed 30 percent of the cone distance for straight-bevel, spiral-bevel, and hypoid gears and should not exceed 25 percent of the cone distance for Zerol bevel gears. In addition, it is recommended that the face width F be limited to
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TABLE 11.1 Material Factors CM
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FIGURE 11.12 Recommended tooth numbers for spiral-bevel and hypoid gears.
10 Pd
The design chart in Fig. 11.14 gives the approximate face width for straight-bevel, spiral-bevel, and hypoid gears. For Zerol bevel gears, the face width given by this chart should be multiplied by 0.83.
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BEVEL AND HYPOID GEARS 11.14
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FIGURE 11.13 Recommended tooth numbers for straight- and Zerol-bevel gears.
11.4.6 Diametral Pitch The diametral pitch is now calculated by dividing the number of teeth in the gear by the gear pitch diameter. Because tooling for bevel gears is not standardized according to pitch, it is not necessary that the diametral pitch be an integer.
TABLE 11.2 Recommended Tooth Numbers for Automotive Applications
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BEVEL AND HYPOID GEARS 11.15
BEVEL AND HYPOID GEARS
FIGURE 11.14 Face width of spiral-bevel and hypoid gears.
11.4.7 Hypoid Offset In the design of hypoid gears, the offset is designated as being above or below center. Figure 11.15a and b illustrates the below-center position, and Fig. 11.15c and d illustrates the above-center position. In general, the shaft offset for power drives should not exceed 25 percent of the gear pitch diameter, and on very heavily loaded gears, the offset should be limited to 12.5 percent of the gear pitch diameter. Hypoid pinions are larger in diameter than the corresponding spiral-bevel pinion. This increase in diameter may be as great as 30 percent, depending on the offset, spiral angle, and gear ratio.
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BEVEL AND HYPOID GEARS 11.16
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FIGURE 11.15 Hypoid offset. To determine the direction of offset, always look at the gear with the pinion at the right. Thus the gear sets of (a) and (b) are both offset below center; similar reasoning shows that (c) and (d) are offset above center. (Gleason Machine Division.)
11.4.8 Spiral Angle In designing spiral-bevel gears, the spiral angle should be sufficient to give a facecontact ratio of at least 1.25. For maximum smoothness and quietness, the facecontact ratio should be between 1.50 and 2.00. High-speed applications should be designed with a face-contact ratio of 2.00 or higher for best results. Figure 11.16 may be used to assist in the selection of the spiral angle. For hypoid gears, the desired pinion spiral angle can be calculated by P = 25 + 5 where P is in degrees. N E + 90 n D
11.4.9 Pressure Angle The commonly used pressure angle for bevel gears is 20 , although pressure angles of 22.5 and 25 are used for heavy-duty drives. In the case of hypoids, the pressure angle is unbalanced on opposite sides of the gear teeth in order to produce equal contact ratios on the two sides. For this reason, the average pressure angle is specified for hypoids. For automotive drives, use 18 or 20 , and for heavy-duty drives, use 22.5 or 25 .
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