Double Helical Gear By Kohli Engineering & Machineries

To cater the variegated demands of our precocious clients, we are highly engrossed in offering a premium quality Double Helical Gear to our precious customers. It is a herringbone gear, a specific type of double helical gear,

[1] is a special type of gear which is a side to side (not face to face) combination of two helical gears of opposite hands.

[2] From the top the helical grooves of this gear looks like letter V. Unlike helical gears they do not produce an additional axial load. Like helical gears, they have the advantage of transferring power smoothly because more than two teeth will be in mesh at any moment in time. Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half. This means that herringbone gears can be used in torque gearboxes without requiring a substantial thrust bearing. Because of this herringbone gears were an important step in the introduction of the steam turbine to marine propulsion.[citation needed] Precision herringbone gears are more difficult to manufacture than equivalent spur or helical gears and consequently are more expensive. They are used in heavy machinery. Where the oppositely angled teeth meet in the middle of a herringbone gear, the alignment may be such that tooth tip meets tooth tip, or the alignment may be staggered, so that tooth tip meets tooth trough. The latter alignment is the unique defining characteristic of a Wuest type herringbone gear, named after its inventor.