Double helical gears, also known as herringbone gears, are sophisticated and versatile components widely used in various industrial applications, including heavy machinery, power generation, and automotive transmissions. They possess unique features that enhance their performance and reliability compared to traditional spur or helical gears. Here's an overview of double helical gears and their characteristics: Helical Tooth Profile: Double helical gears feature two sets of helical teeth with opposite hands (left-hand and right-hand), forming a V-shaped groove along the gear's circumference. This design reduces axial thrust forces, vibration, and noise compared to single helical gears, resulting in smoother operation and enhanced gear meshing. Axial Thrust Compensation: The opposing helix angles of the teeth in double helical gears cancel out axial thrust forces generated during rotation. This eliminates the need for thrust bearings or special provisions to accommodate axial loads, simplifying gear assembly and reducing component wear.