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Rating Chart - Crane duty helical gearbox

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Horse Power Rating Chart
AGNEE Crane Duty Helical Gear Boxes

SELECTION PROCEDURE

Satisfactory performance of the gearbox depends upon correct selection. The selection of a gear unit is influenced by the class of duty of the crane which should be determined and specified. Single, Double and Triple stage Horizontal gear units type HA, HB and HC are recommended for Hoist and Long Travel drive. Three stage vertical gear units type VC are recommended for cross travel drives of the EOT crane. Assembly arrangement must be specified while ordering the gear units.

1. Compute the required reduction ratio.
2. Determine the horsepower required for the prime mover.
3. Refer to the rating table, see in the ratio column and based on input rpm check the gear box rating horizontally for various class of duty of the crane.
4. The size should be selected such that the rated HP is equal or more than the consumed HP.

EXAMPLE

1. Select a unit to transmit 9 HP from 720 rpm electric motor for hoist drive in a class II duty crane, the reduction ratio required is 31.50.
·   For hoist drive a two stage horizontal gearbox type HB will be suitable.
·   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 is 9, the unit HB-350 will be suitable.

2. Select a unit to transmit 3 HP from 960 rpm 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.
·   See the ratio column and in the size VC – 32Q, for input rpm of 960 in class IV duty the rated HP is 3

As the consumed HP is 3, the unit VC – 320 will be suitable.