rating data overload factors power source standard and ground tooth stock spiral bevel gears character of load on driven machine uniform 1.00 1.25 1.50 medium shock 1.25 1.50 1.75 heavy shock 1.75 2.00 2.25 rating data and specifications arrow stock gears are lapped to agma quality number 9 or ground to agma quality number 11 each pair of gears is made of alloy steel with carburized and hardened teeth 20° pressure angle and 35° spiral angle are standard all pinions are left hand spiral mounting distance backlash mating teeth and set number are etched on each pair see page 16 hub type gears can be rebored to the maximum diameter specified in the tables it is preferred that all remachining of bores be performed by arrow gear company calculations tw hp x 63025 rpm uniform light shock medium shock arrow stock gear selection 1 calculate the pinion working torque twp twp 63025 x hp rpmp 2 estimate the rated pinion torque trp trp 2 x twp 3 find the rated pinion torque in the catalog th
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stock 2 to 1 ratio figure 5 figure 7 figure 9 figure 6 figure 8 part no figure gear outside dia pitch dia pinion outside dia pitch dia combination diametral pitch face width a mount dist b bore length c bore dia d hub dia e hub length f apex to back g bore dia 001 000 0005 0000 5 6 5 6 5 7 5 7 6 7 6 7 6 8 6 8 6 3.200 3.200 1.764 1.600 16 10 32 3.783 3.778 2.087 1.889 17 9 34 4.518 4.500 2.457 2.250 18 8 36 5.457 5.429 2.965 2.714 19 7 1 3 1¹ 1¹ 2¹ 2 1 1 2 38 6.699 6.667 3.620 3.333 20 6 1³ 3¹¹ 1³ 1 2³ 2¹ 1 1¹¹ 3¹ 40 8.053 8.000 4.404 4.000 20 5 1 4 1 1 2 3¹ 2¹ 2¹ 3 40 9.985 10.000 5.436 5.000 20 4 1³ 5¹ 2 1¹³ 3³ 2 40 12.069 12.000 6.517 6.000 21 3¹ 2 6 2¹ 2¹ 3 3¹ 42 14.413 14.362 7.760 7.181 23 46 3¹³ 2³ 7 2¹ 2 4¹ 4 1 1¹¹ 1 2¹ 1¹ 1¹ 1¹ 2¹ ¹³ 2 1 2¹ 1³ 1 2¹ ³ 1¹ ³ 1¹ ¹ 1 1³ ³ ¹ ³ ¹ ¹ ¹³ ¹ ¹ 3³ 5 6 5³ 3 5³ 8 6 ¹ 9¹ h c bore dia j bolt circle k web thick l c bore depth m bore length holes n size no keyway max 10¹ ¹³ 12 ³ ³ ¹ 12 ¹ -20 a 12 ³ x¹ ¹ x³ ³ x¹ ¹ x³ ³ x¹ ³ x¹ ¹ x³ ³ x¹ ³
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stock 3 to 2 ratio figure 14 figure 16 figure 18 figure 15 figure 17 part no figure gear outside dia pitch dia pinion outside dia pitch dia combination diametral pitch face width a mount dist b bore length c bore dia d hub dia e hub length f apex to back g bore dia 001 000 0005 0000 14 15 14 15 14 15 14 15 15 16 15 16 15 16 15 17 17 17 17 17 15 2.420 2.400 1.722 1.600 16 24 10 3.037 3.000 2.169 2.000 16 8 24 3.496 3.429 2.506 2.286 16 7 24 4.070 4.000 2.930 2.667 16 6 24 5.067 5.000 3.578 3.333 20 6 1 3 1¹ 2³ 1 30 6.080 6.000 4.290 4.000 20 30 5 1¹ 3¹ 3¹ 1³ 1 7.278 7.200 5.094 4.800 24 5 1¹ 4¹ 1 36 8.722 8.667 6.065 5.778 26 39 4¹ 1³ 10.589 10.500 7.355 7.000 28 4 1³ 42 12.943 12.857 8.960 8.571 30 45 3¹ 2 15.639 15.500 10.908 10.334 30 45 2.903 2³ 6¹ ¹ ³ 1¹ ³ 1¹ ¹¹ 2³ 1 2 1¹ ¹³ 2¹ 1¹ 2¹ 1¹ 1 1 1¹ 1³ 3 5³ 2 4¹¹ 3 5¹³ 4¹ 8 2 1 3¹ 3³ ³ 1¹ 1 ¹ 1 ¹ 1¹ 1¹ 1³ 1³ 1 1 1¹¹ 1 1¹ 1¹¹ 1 2¹ 2¹ 2³ 2³ 2 2³ 3¹ 3¹ 3¹ 3 6 ¹ 3¹ 5 4¹ 6 5¹ 3¹ 4 4 4 5¹ 7¹ 6¹³ 4 4 6 6¹ 8 7³ 11¹ 10 ¹ ³ ¹ ¹¹ ¹¹ ³ h c bore
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figure 19 figure 20 figure 21 35p27r36 35p36l27 6p24r32 5p24r32 4p24r32 8p21r28 7p21r28 part no figure gear outside dia pitch dia pinion outside dia pitch dia combination diametral pitch face width a mount dist b bore length c bore dia d hub dia e hub length f apex to back g bore dia 001 000 0005 0000 19 19 19 19 19 20 19 20 19 21 21 21 21 3.548 3.500 2.789 2.625 21 8 28 21 4.068 4.000 3.186 3.000 28 7 5.379 5.333 4.219 4.000 24 6 1 32 6.503 6.400 5.053 4.800 24 5 1¹ 3 3¹ 1 1 3¹ 3 1 1¹¹ 3¹ 32 8.084 8.000 6.288 6.000 24 4 1¹ 4¹ 2 1¹³ 3³ 2 32 10.434 10.286 8.117 7.714 27 3¹ 1³ 4³ 3³ 36 12.152 12.000 9.424 9.000 27 3 2 5 4 36 ¹¹ 2¹ 1 2¹ 1¹ 1¹ 2¹ 2 1¹ 1¹ 2¹ ³ 2 1¹ 1³ 2³ 3³ 1³ 1 2³ 1 1 2 ¹ 1 ³ ¹ 3¹ 3³ 5³ 4¹ 5¹ 3¹ 5¹ 4¹ 4¹ 5 7¹ 6¹ 6¹ 4 6 4 5³ 6 8¹ 7 h c bore dia j bolt circle k web thick l c bore depth m bore length holes size no keyway max ¹³ 12 ³ ³ ¹³ 12 ³ ³ ¹ 12 ³ 1¹ ³ ³ ¹ 12 ¹ 12 ¹ x³ ¹ x³ ¹ x³ ¹ x³ bore ³ x¹ 2 3.00 ³ x¹ 2 5.25 ³ x¹ 2³ 5.12 ³ x¹ 2¹ 8.28 ¹ x³ 2³ 9.38 8.12 1³ 1.0
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18 inch pitch diameter of gear sizes o.d gear pinion pitch dia gear pinion ratio specification combination diam face pitch width mounting distance gear pinion min design bore bolt circle dia no of bolts bolt size capacity torque pinion lb inches torque gear lb inches 18.196 18.196 18.062 18.015 18.013 18.034 7.980 6.558 5.235 4.235 18 18 18 18 18 18 7.33 5.89 4.58 3.65 1.00 2.46 3.06 3.93 4.93 39-39 22-54 18-55 15-59 14-69 2.17 3¹³ 3.00 3.06 3.28 3.83 2³ 2³ 2³ 2³ 10 4³ 4 3¹ 3 10 10.750 13.375 9¹ 12.500 14.125 9¹ 12.500 14.125 9¹ 12.500 14.125 9¹ 12.500 14.125 12 12 12 12 12 ¹ 20 147373 147373 ¹ 20 ¹ 20 ¹ 20 ¹ 20 33827 26219 19457 14362 83030 80114 76531 70784 20 inch pitch diameter of gear 20.218 20.218 20 20.086 20.025 20.026 20.023 20.015 20.012 8.795 7.987 7.466 6.318 5.641 4.856 20 20 20 20 20 20 20 8 7.47 6.93 5.71 5.07 4.27 1.00 2.5 2.68 2.88 3.50 3.95 4.69 39-39 20-50 28-75 26-75 20-70 19-75 16-75 1.95 2.50 3.75 3.75 3.50 3.75 3.75 4¹ 3 3 3 3 3 3 11 11 12.500 14.625 12 12 12 12
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stock ground tooth now from the spiral bevel gear specialists ground tooth spiral bevel gears from stock reduce gear noise ground tooth spiral bevel gears are a design must at high speeds to reduce the decibel level of your gear box tooth contact ratios are maintained to a minimum of 2.0 to assure quiet operations eliminate positioning errors to achieve near zero positioning error designers and manufacturers of radar systems navigational gear printing presses and machine tools specify ground tooth spiral bevel gears higher quality all arrow ground tooth spiral bevel gears are manufactured to agma quality number 11 or better arrow gear company was the first gear manufacturer to offer ground tooth spiral bevel gears from stock the most popular sizes of 1:1 and 2:1 ratios are currently available for time-saving off-the-shelf delivery every stock ground tooth gear is designed and manufactured to fulfill the following requirements for discriminating gear buyers speeds in excess of 8
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bearing loads fig 24 tangential load coefficients for bearing loads coefficients for spiral bevel gears 90° shaft angle 20° pressure angle 35° spiral angle load face ratio ng/np 1.0 1.1 1.2 concave pinion kxp krg .809 .817 .822 .826 .828 .829 .829 .829 .828 .827 .825 .815 .805 .795 .787 .780 .774 .768 .764 .760 .756 .753 .750 .747 .745 .743 .741 convex gear kxg krp 181 142 107 075 045 019 .006 .028 .048 .067 .084 .152 .200 .235 .261 .282 .298 .312 .323 .333 .341 .348 .354 .359 .364 .369 .372 126050 hp d rpmp wt 1 f d 1+mg2 convex pinion concave gear kxp krg 181 219 253 284 312 336 358 378 396 413 428 485 524 551 572 587 599 609 618 625 630 635 640 643 647 650 653 kxg krp .809 .800 .790 .779 .769 .758 .748 .738 .728 .719 .711 .673 .643 .620 .601 .586 .573 .562 .553 .546 .539 .533 .528 .523 .519 .515 .512 tangential load coefficients for bearing loads the normal load on spiral bevel gear tooth surfaces may be resolved into three 3 components wt tang
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mountings matched angular contact or double row deep groove angular contact bearings are preferred at the other end of the shaft a single row radial bearing may be used as shown in figures 30 and 33 when mounted on taper roller bearings the indirect mounting should be used that is the large ends of the tapered rollers of each bearing should point outward as shown in figures 31 and 32 the thrust load of the pinion is thus absorbed by the bearing adjacent to the pinion and the reverse thrust load will be taken by the opposite bearing in either type of mounting both the gears and thrust bearings should be locked against thrust in either direction this applies to straight bevel and zerol® bevel gears as well as to spiral bevel and hypoid gears it is accepted practice to preload the bearings to remove initial freedom in the mounting the amount of preload depends upon the mounting load and operating speed and should be established by the bearing manufacturer mountings rigid mountings should
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fig 30 typical straddle mounting for both members of a spiral bevel pair fig 31 this mounting is another form of bearing arrangement for overhung pinions fig 32 straddle pinion mounting for short shafts showing use of combined thrust and radial bearings gear mounted in oil-tight case fig 33 arrangement recommended for long shafts to prevent temperature changes affecting position of gear mounted in oil-tight case acknowledgment is gratefully extended to gleason works rochester new york and to the american gear manufacturers association for portions of the text and illustrative material used in this section 17 mountings
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gears and geardrives provide the following data in line with your specific requirements please complete the form reproduce it and send it along with a sketch of the application company name title street city state zip country telephone fax email 1 quantity prototype production 2 application 3 ratio approx exact reducer reversing yes no @rpm torque @rpm torque hi shock increaser 4 rating normal input hp maximum input hp 5 type of load uniform med shock prime mover gear data type spiral bevel pitch zerol bevel no of teeth straight bevel pr angle hypoid spiral angle spur shaft angle helical agma class other material part no enclosed drives shaft requirements parallel intersect skew angle other duty cycle b10 life hrs overhung load type of lub 6 size limitations 7 it is essential that you send an assembly print or sketch showing a driving member and direction of rotation b means of absorbing axial radial gear load
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2301 curtiss street downers grove il 60515 usa 630 969-7640 fax 630 969-0253 www.arrowgear.com © 2008 arrow gear company 2008 v1
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