crane duty helical gearbox

Crane Duty Helical Gear Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox depends upon correct selection. Selecting a gear unit is influenced by the course of duty of the crane which should be determined and specified. Single, Double and Triple stage Horizontal equipment systems type HA, HB and HC are suggested 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 must be specified while purchasing the gear units.

1. Compute the required reduction ratio.
2. Determine the horsepower necessary for the prime mover.
3. Refer to the rating desk, see in the ratio column and based on input rpm check 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 more compared to the consumed HP.

EXAMPLE
1. Select a unit to transmit 9 HP from 720 rpm electric engine 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.
· See the ratio column and in the size HB-350, for insight rpm of 720 in course II duty the ranked HP is 9.5
· As the consumed HP is 9, the machine HB-350 will be suitable.

2. Select a unit to transmit 3 HP from 960 rpm electric engine 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 be suitable.
· See the ratio column and in the size VC – 32Q, for insight rpm of 960 in class IV duty the ranked HP is 3

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