\u00b7 For cross travel drive, a vertical gearbox type VC will be suitable.
\u00b7 See the ratio column and in the size VC – 32Q, for insight rpm of 960 in course IV duty the rated HP is 3<\/p>\n
Crane Duty Helical Gear Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox depends upon correct selection. The selection of a gear unit is definitely influenced by the course of duty of the crane which should be determined and specified. Single, Double and Triple stage Horizontal gear models type HA, HB and HC are recommended for Hoist and Long Travel drive. Three stage vertical equipment systems type VC are recommended for cross travel drives of the EOT crane. Assembly arrangement should be specified while buying the gear units.<\/p>\n
1. Compute the required reduction ratio.
2. Determine the horsepower necessary for the prime mover.
3. Make reference to the rating desk, see in the ratio column and based 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 than the consumed HP.<\/p>\n
EXAMPLE
1. Select a unit to transmit 9 HP from 720 rpm electric engine for hoist drive in a course II duty crane, the reduction ratio required is 31.50.
\u00b7 For hoist drive a two stage horizontal gearbox type HB will become suitable.
\u00b7 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
\u00b7 As the consumed HP can be 9, the machine HB-350 will end up being suitable.<\/p>\n
2. Select a unit to transmit 3 HP from 960 rpm electric engine for cross travel drive in a class IV duty crane, the reduction ratio required is 14.26.
\u00b7 For cross travel drive, a vertical gearbox type VC will be suitable.
\u00b7 See the ratio column and in the size VC – 32Q, for insight rpm of 960 in course IV duty the rated HP is 3<\/p>\n