Appendix B: Gearbox Selection
Page B–3
IronHorse® Helical Gearbox User Manual – 1st Ed. Rev. B
5) Use specification table to select gearbox with Max Output Torque Rating > required real torque:
Gearbox required real torque = (final torque)(pulley ratio)
For 10:1 gearbox:
(5500 in-lb) / 5.83 = 943.40 in-lb;
use HGR-37-x or larger
For 15:1 gearbox:
(5500 in-lb) / 3.89 = 1413.88 in-lb;
use HGR-37-x or larger
For 20:1 gearbox:
(5500 in-lb) / 2.92 = 1883.56 in-lb;
use HGR-47-x or larger
For 30:1 gearbox:
(5500 in-lb) / 1.94 = 2835.05 in-lb;
use HGR-67-x or larger
For 40:1 gearbox:
(5500 in-lb) / 1.46 = 3767.12 in-lb;
use HGR-67-x or larger
6) Use specifications table to select gearbox with Max Output Torque Rating > required design
torque:
Gearbox required design torque = (real gearbox torque)(service factor)
For 10:1 gearbox:
(943.40 in-lb)(1.25) = 1179.25 in-lb;
use HGR-37-x or larger
For 15:1 gearbox:
(1413.88 in-lb)(1.25) = 1767.35 in-lb; use HGR-47-x or larger
For 20:1 gearbox:
(1883.56 in-lb)(1.25) = 2354.45 in-lb; use HGR-47-x or larger
For 30:1 gearbox:
(2835.05 in-lb)(1.25) = 3543.81 in-lb; use HGR-67-x or larger
For 40:1 gearbox:
(3767.12 in-lb)(1.25) = 4708.90 in-lb; use HGR-67-x or larger
7) Use the gearbox overhung load ratings from the specifications table to determine the minimum
allowable pulley diameter. Select gearbox with Overhung Load Rating > overhung load force:
Gearbox required OHL rating = (gearbox real torque)(K)(SF)/(gearbox pulley diameter / 2)
Minimum gearbox pulley diameter = (T)(K)(SF)(2)/(OHL rating)
Conveyor pulley diameter = (gearbox pulley diameter)(pulley ratio)
For 10:1, HGR-37-010-x gearbox:
Minimum gearbox pulley diameter = (943.40 in-lb)(1.5)(1.25)(2)/(388 lb) = 9.12” (use 9.25”)
Conveyor pulley diameter = (9.25”)(5.83) =
53.93”
[pulley size is too large – try next higher
gearbox ratio]
For 15:1, HGR-37-015-x gearbox:
Minimum gearbox pulley diameter = (1413.88 in-lb)(1.5)(1.25)(2)/(451 lb) = 11.76” (use 11.8”)
Conveyor pulley diameter = (11.8”)(3.89) =
45.9”
[pulley size is too large – try next higher
gearbox ratio]
For 20:1, HGR-47-020-x gearbox:
Minimum gearbox pulley diameter = (1883.56 in-lb)(1.5)(1.25)(2)/(690 lb) = 10.24” (use 10.3”)
Conveyor pulley diameter = (10.3”)(2.92) =
30.08”
[pulley size is too large – try next higher
gearbox ratio]
For 30:1, HGR-67-030-x gearbox:
Minimum gearbox pulley diameter = (2835.05 in-lb)(1.5)(1.25)(2)/(1305 lb) = 8.15” (use 8.5”)
Conveyor pulley diameter = (8.5”)(1.94) = 16.5” (use 16.0”)
Select HGR-67-030-x gearbox, 8.5” gearbox pulley and 16” conveyor pulley.
For 40:1, HGR-67-040-x gearbox:
N/A – All gearboxes of the same frame size are the same price, yet the smaller ratio gearboxes
offer higher efficiency and power characteristics than higher ratio gearboxes. Therefore, the
HGR-67-030-x gearbox is preferable over the HGR-67-040-x gearbox for this application.
Содержание IronHorse HGR-37-005-A
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