Herringbone gears are used to eliminate axial thrust. Here's why:

Introduction:
Gears are used to transmit power and motion between two rotating shafts. They are designed with teeth that mesh together to transfer torque from one shaft to another. However, gears can experience axial thrust, which is a force that acts along the axis of rotation. This force can cause problems such as wear and tear, noise, and even failure of the gear system.

What are Herringbone Gears?
Herringbone gears are a type of double helical gears, which means they have two sets of teeth that are arranged in a V-shape. The teeth on one side of the gear point to the left, while the teeth on the other side point to the right. This design allows the gears to mesh together without any axial thrust.

How do Herringbone Gears Work?
When two Herringbone gears are meshed together, the opposing helix angles cancel out any axial thrust that would occur with a traditional spur gear. The V-shape of the teeth creates a zigzag pattern that cancels out the axial forces on the gear.

Advantages of Herringbone Gears:
Herringbone gears have several advantages over traditional gears, including:

1. Elimination of axial thrust: As mentioned earlier, Herringbone gears eliminate axial thrust, which reduces wear and tear on the gear system.

2. Smooth operation: The opposing helix angles of Herringbone gears create a smooth meshing action, which reduces noise and vibration.

3. High load capacity: Herringbone gears have a larger contact area than traditional gears, which allows them to handle higher loads.

Conclusion:
Herringbone gears are an excellent choice for applications where axial thrust is a concern. They offer several advantages over traditional gears, including the elimination of axial thrust, smooth operation, and high load capacity.