Crane Duty Helical Gear Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox is dependent upon correct selection. Selecting a gear unit is certainly influenced by the class of duty of the crane that ought to be determined and specific. Single, Dual and Triple stage Horizontal gear products type HA, HB and HC are recommended for Hoist and Long Travel drive. Three stage vertical gear products type VC are recommended for cross travel drives of the EOT crane. Assembly arrangement should be specified while purchasing 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, see in the ratio column and predicated on input rpm verify the gear box rating horizontally for various course of duty of the crane.
4. The size ought to be selected such that the rated HP is equal or even more than the consumed HP.
EXAMPLE
1. Decide on a unit to transmit 9 HP from 720 rpm electric electric motor for hoist drive in a class II duty crane, the decrease ratio required is 31.50.
· For hoist drive a two stage horizontal gearbox type HB will end up being suitable.
· Start to see the ratio column and in the size HB-350, for input rpm of 720 in class II duty the rated HP is 9.5
· 
As the consumed HP can be 9, the unit 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 class IV duty crane, the reduction ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will be suitable.
· Start to see the ratio column and in the size VC – 32Q, for insight rpm of 960 in course IV duty the ranked HP is 3
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