Herringbone Gears
OEM Customized High Quality Herringbone Gears
A herringbone gear, a specific type of double helical gear, is a side to side (not face to face) combination of two helical gears of opposite hands. Each helical groove of this gear looks like the letter V, and many together form a herringbone pattern (resembling the bones of a fish such as a herring). Unlike helical gears, herringbone gears do not produce an additional axial load.
Applications of Herringbone gear include transmission of high torque, heavy machinery, gas turbines, heavy-duty vehicles, torque gearboxes, etc. Apart from these, some of the other uses of these Herringbone gears include :
- The herringbone gears are used in the torque gearbox.
- Used in a steam turbine to marine propulsion.
- It is used in roller shafts in steel mills.
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Double helical gear or herringbone gears are always used in heavy-duty machinery. Herringbone gear is a special gear that is a side-to-side combination of two helical gears of opposite hands. Double helical gear with an advantage over helical gears is balanced by the side thrust of one-half, which means that double helical gears can be used in torque gearboxes without requiring a substantial thrust bearing.
Machining Herringbone Gears
A practical cutting process for a herringbone gear typically involves hobbing, milling, and shaping. However, these methods depend primarily on whether or not a gap is required between the two helixes or if the herringbone is continuous.
1) Hobbing
When cutting herringbone teeth, rotary cutters and hobs are typically used. However, their functionality is only practical when there is a large gap to allow for cutter runout between the right and left helixes. Hobbing machines can be manufactured today to machine herringbone teeth in gears up to 5.6m in diameter.
2) End Milling
Cutting teeth in herringbone gears is not solely regulated to hobbing machines; end mills also can machine teeth, unaffected by whether or not the gears possess center slots. Herringbone gears with a large diameter are generally better suited for end milling.
3) Shaping
Finally, we come to shaping – another suitable method to cut teeth on herringbone gears, provided they are continuous and contain a center slot. Many similarities exist between the shaper used for cutting a helical gear and a herringbone gear, however, in the case of the herringbone gear two cutters – one for each helix -are controlled at once by an operator.
