HERRINGBONE GEAR
A herringbone gear is a specific type of double helical gear. This specialist type of gear has a side to side (not face to face) combination of two helical gears of opposite hands.
Advantage
High Degree
Herringbone gears have a high degree of overlap, with at least 2 teeth meshing at any given moment.
High Load-Bearing Capacity
Herringbone gears have high load-bearing capacity and work smoothly.
No Axial Force
Herringbone gear theory has no or very small axial force . due to the opposite direction of tooth helix angle in the symmetry direction.
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What Is the Difference Between Double Helical and Herringbone Gears?
A double helical gear can be identified if the pair of helical gears demonstrate opposite helix cuts on a gear blank with a narrow gap, allowing them to maintain the benefits of helical gears while also ensuring axial thrust loads are negated.
The subtle difference between a double helical gear and a herringbone gear can be seen if the two gears have no groove between them, meaning they interact at a common point.
This allows for the operation of these gears at high speed without producing noise. This difference means a dedicated machining process is required for their fabrication.
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Machining Herringbone Gears
An effective cutting process for a herringbone gear typically involves hobbing, milling, and shaping, though these methods depend largely on whether or not a gap is required between the two helixes or if the herringbone is to be continuous.
Hobbing
When cutting herringbone teeth, rotary cutters and hobs are typically used. However, their functionality is only effective when there is a gap large enough 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.
End Milling
Cutting teeth in herringbone gears is not solely regulated to hobbing machines; end mills also have the capability of machining teeth, unaffected by whether or not the gears possess centre slots. Herringbone gears with a large diameter are generally better suited to be cut by end milling.
Shaping
Finally, we come to shaping – another suitable method to cut teeth on herringbone gears, provided they are continuous and contain a centre 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.
Herringbone Gear
A combination of left-handed and right-handed helical gears with the same twist angle is called a double helical gear. Double helical gears transmit rotational motion between two parallel shafts.
Double helical gears and herringbone gears are the same type of gear, but those with a groove in the center are called double helical gears, while those without a groove where the left and right teeth meet in the center, are called herringbone gears.
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A herringbone gear, a specific type of double helical gear, is a special type of gear that is a side-to-side (not face-to-face) combination of two helical gears of opposite hands.
What is herringbone gear?
They are gears that have a V pattern on the teeth. They work like 2 helical (slanted tooth) gears mirror image stuck together. They provide a smoother transmission and engagement, reduce noise, reduce wear (wider surface area and sliding keeps lubricant film) and offer some minor self-centering capabilities.
What are herringbone gears used in?
the use of this design of gear is restricted to relatively slow moving but very high torque loads，the reaction from the load on the teeth by prying to push them apart is cancelled out by the design and there is more tooth root strength because of the gear width，place like the drive boxes in ball mills , roller shafts in steel mills , gear boxes in large shafts in ships would be places that ise this gear.
What are the advantages of a herringbone gear?
One major advantage of herringbone gears is super strong credited to the increased surface contact being at angles. Another advantage is they do not walk side to side (wobble) as straight cut gears or bevel gears. The third advantage is they hold lubrication better. The disadvantages are they are difficult and costly due to machine time to manufacture. A finely matched pair of precision lapped-in herringbone gears are very quiet compared to straight cut gears because of minimum backlash.
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