Crane Duty Helical Gear Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox depends upon correct selection. Selecting a gear 
unit is definitely influenced by the class of duty of the crane that ought to be determined and specified. Single, Dual and Triple stage Horizontal equipment products type HA, HB and HC are recommended for Hoist and Long Travel drive. Three stage vertical equipment units type VC are recommended for cross travel drives of the EOT crane. Assembly arrangement should be specified while buying the gear units.
1. Compute the mandatory reduction ratio.
2. Determine the horsepower required for the prime mover.
3. Make reference to the rating desk, discover in the ratio column and predicated on input rpm verify the gear box ranking horizontally for various class of duty of the crane.
4. The size should be selected in a way that the ranked HP is equal or even more compared to the consumed HP.
EXAMPLE
1. Select a unit to transmit 9 HP from 720 rpm electric electric motor for hoist drive in a course II duty crane, the decrease ratio required is 31.50.
· For hoist drive a two stage horizontal gearbox type HB will be suitable.
· Start to see the ratio column and in the size HB-350, for insight rpm of 720 in course II duty the rated HP is 9.5
· Since the consumed HP is definitely 9, the machine HB-350 will end up being suitable.
2. Decide on a unit to transmit 3 HP from 960 rpm electric electric motor for cross travel drive in a course IV duty crane, the reduction ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will become suitable.
· See the ratio column and in the size VC – 32Q, for input rpm of 960 in course IV duty the ranked HP is 3
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