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Double Helical Gear

Double helical gears are a variation of helical gears in which two helical faces are placed next to each other with a gap separating them. Each face has identical but opposite helix angles. Employing a double-helical set of gears eliminates thrust loads and offers the possibility of even more significant tooth overlap and smoother operation. Double helical gears are commonly used in enclosed gear drives as helical gear.


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Double helical gears

Double Helical Gear VS Herringbone Gear

Double Helical Gear

(1) Double helical gears are a special type of herringbone gear where the two sets of angled teeth are offset by half a tooth.
(2) Double helical gears allow for smoother engagement.
(3) Double helical gears are often used in high-speed applications as it can handle more power and it’s quieter than a herringbone gear.
(4) Double helical gears look like two screws threading into each other. They have multiple helical (screwlike) grooves on the faces of their teeth that cause them to mesh together tightly.
(5) Double helical gears also experience much less wear because nothing is chasing adjacent tooth surfaces but air. Double helical gears are more compact gear systems with less noise and vibration.
(6) Double helical gears are less likely to slip and cause damage than Herringbone gears.

Herringbone Gear

(1) Herringbone gears are gears where the teeth of one gear are set at an angle to the teeth of the mating gear. This angled orientation permits two herringbone gears to mesh together without crossing their paths, which would cause them to jam.
(2) Herringbone gears are a type of gear system in which the gears are arranged in a chevron pattern. This pattern results in gear with two
(3) Herringbone gears are more rigid than double-helical gears because the teeth on one side of the gear do not line up with the teeth on the other side.
(4) Herringbone gears are so named because their teeth look like the skeleton of a herring fish. They have two V-shaped teeth set at angles to each other, with the center of each tooth aligned along the common axis of rotation.
(5) Herringbone gears are often used in low-speed, high torque applications.

The Different Types Of Gears

Helical Gear

Helical gears have teeth that are oriented at an angle to the shaft.

Bevel Gear

Bevel gears are used in applications where a right angle gear drive is required.

Worm Gear

Worm gears produce thrust load and are good for high shock load applications.

Spur Gear

Spur gears transmit power through shafts that are parallel.


Advantages of Double Helical Gear

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High reduction ratio

Double helical gears are similar to a worm gear but the teeth are on two opposite sides of the gear, which provides a reduction ratio of 1:2.

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high load capacity

Double helical gears are very smooth at gear operations, and has a very high load capacity, and are suitable for heavy-duty applications.

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high efficiency

They are more efficient because of the way they transfer power between the input and output shafts, providing a significant amount of power to the output shaft with less mechanical energy required at the input.

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Sturdy and quiet

Double helical gears have all of the advantages of helical gears, which are strong and quiet, plus have the advantage of being able to cancel the thrust forces by combining helical gears with both right and left-hand twists.


Disadvantages of Double Helical Gears

(1) Double helical gears have higher manufacturing costs due to their complex design. (2) Double helical gears do not allow as much rotation before coming into contact with another tooth as spur gears do, so they require a wider pitch and smaller diameter gear than spur gears to produce the same torque. (3) The teeth on the gears are thinner than those on single helical gears, making them more susceptible to wear. (4) There is a high possibility of gear breakage if the teeth are not lined up properly during installation. (5) It is pretty expensive and complex to manufacture. (6) It has a high level of friction compared to other types of gear.

Double Helical Gear Uses

Due to its advantages of high load capacity and stable transmission, double helical gears have been widely used in the power transmission of gas turbines, generators, prime movers, pumps, fans and compressors in ships and construction machinery.

Customized Gears

As well as double helical gears, we also manufacture other gear types such as spur gears, helical gears, worm gears, and double helical gears for your planetary gearboxes, worm gearboxes, extruder gearboxes, and helical bevel gearboxes.

Despite being complex, our team is supremely confident that they can channel their skills, and years of experience, into creating new gear pairs that are tough, accurate, based on your drawings and specifications, and can handle the input torque, forces, and processing power of the machining technology that a typical double-helical gear transmission system powers.


Featured Products

Double Helical Gear

Double helical gears are manufactured using two spiral-shaped surfaces on a single gear, making them more robust than the normal ones.

Customized Large Diameter Double Helical Gear

Double helical gears have very high load capacity and are suitable for heavy-duty applications.

High Precision Double Helical Gear

Double helical gears are similar to a worm gear, but the teeth are on two opposite sides of the gear, which provides a reduction ratio of 1:2.

Spur Helical Gear

These spur helical gears to share rotary motion between parallel shafts and are cylindrical with teeth straight and parallel to the axis of rotation.

Plastic Double Helical Gear

Plastic double gears have a wider application area than metal gears, so they push the gears towards higher loads and more power.

Helical Gear

The helical gears offered by us are made as per the industry’s standards and are widely used in the automotive and engineering sectors.


Double Helical Gear Efficiency

Gear Design Features

A double helical gear consists of two helix angles with opposite hands. Inside the gears, the axial thrusts oppose each other and the resulting forces are not transmitted to the bearings on the shaft. This gear pair setup means they can handle high loads and allow for a solid transmission while running. Additionally, double helical gears are much stronger in terms of tooth contact than single helical, spur or worm gears. There are also no side forces or end loads on the mounting shaft during power transmission.

Efficiency levels

The parallel shaft gears and their meshes are in constant rolling contact. The teeth of these gears are always touching the other gear, powering it, and ensuring that whatever application it is powering is being run to a high level. As a result of this constant contact, the general efficiency rating of this gear unit is high and ranges from 90% to an incredible 99.5%.

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